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  Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 291 journals)
    - CERAMICS, GLASS AND POTTERY (26 journals)
    - MACHINERY (32 journals)
    - MANUFACTURING AND TECHNOLOGY (180 journals)
    - METROLOGY AND STANDARDIZATION (3 journals)
    - PACKAGING (15 journals)
    - PAINTS AND PROTECTIVE COATINGS (5 journals)
    - PLASTICS (28 journals)
    - RUBBER (2 journals)

MACHINERY (32 journals)

Showing 1 - 0 of 0 Journals sorted alphabetically
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9)
Advanced Energy Materials     Hybrid Journal   (Followers: 23)
Applied Mechanics Reviews     Full-text available via subscription   (Followers: 26)
BER : Consumer Goods Industries Survey     Full-text available via subscription  
BER : Intermediate Goods Industries Survey     Full-text available via subscription   (Followers: 1)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
CORROSION     Full-text available via subscription   (Followers: 18)
Electric Power Components and Systems     Hybrid Journal   (Followers: 6)
Engenharia Agrícola     Open Access  
Foundations and Trends® in Electronic Design Automation     Full-text available via subscription  
High Speed Machining     Open Access   (Followers: 3)
High Temperature Materials and Processes     Hybrid Journal   (Followers: 4)
International Journal of Machine Tools and Manufacture     Hybrid Journal   (Followers: 5)
International Journal of Machining and Machinability of Materials     Hybrid Journal   (Followers: 6)
International Journal of Manufacturing Technology and Management     Hybrid Journal   (Followers: 8)
International Journal of Precision Technology     Hybrid Journal  
International Journal of Rapid Manufacturing     Hybrid Journal   (Followers: 4)
International Journal of Rotating Machinery     Open Access   (Followers: 2)
Journal of Machinery Manufacture and Reliability     Hybrid Journal   (Followers: 2)
Journal of Machinery Manufacturing and Automation     Open Access   (Followers: 2)
Journal of Strain Analysis for Engineering Design     Hybrid Journal   (Followers: 6)
Journal of Terramechanics     Hybrid Journal   (Followers: 2)
Machine Design     Partially Free   (Followers: 94)
Machines     Open Access   (Followers: 2)
Materials     Open Access   (Followers: 6)
Mechanics Based Design of Structures and Machines: An International Journal     Hybrid Journal   (Followers: 3)
Micromachines     Open Access   (Followers: 3)
Practical Machinery Management for Process Plants     Full-text available via subscription  
Pump Industry Analyst     Full-text available via subscription   (Followers: 2)
Russian Engineering Research     Hybrid Journal  
Sensor Review     Hybrid Journal   (Followers: 2)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 5)
Journal Cover International Journal of Machine Tools and Manufacture
  [SJR: 2.746]   [H-I: 100]   [5 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0890-6955
   Published by Elsevier Homepage  [3039 journals]
  • Tool deflection model and profile error control in helix path contour
           grinding
    • Authors: Yanglin Peng; Yifan Dai; Ci Song; Feng Shi
      Pages: 1 - 8
      Abstract: Publication date: Available online 18 August 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Yanglin Peng, Yifan Dai, Ci Song, Feng Shi
      Because of finite stiffness of grinding system, grinding force will cause the tool deflection (the difference between actual cutting depth and nominal cutting depth). During helix path contour grinding, the grinding condition are variable at different grinding point which will bring forward different tool deflection and result in dimensional errors. This paper presents an error analysis model during multi-pass grinding, which can predict the accumulation process of surface profile error induced by tool deflection. It establishes the relationship between profile error and grinding parameters. The estimation method of key model parameters is described in the proposed model through series of experiments. According to the error analysis model, we can implement the varied feed rate and varied cutting depth method for compensating the profile error. The grinding experimentation and compensation grinding verifies the validity of error analysis model and effectiveness of compensation method, and the profile error reduced by 82.1% comparing with grinding process without compensation.

      PubDate: 2016-08-23T08:35:00Z
      DOI: 10.1016/j.ijmachtools.2016.08.005
      Issue No: Vol. 111 (2016)
       
  • Functional Accuracy Investigation of Work-Holding Rotary Axes in Five-Axis
           CNC Machine Tools
    • Authors: Mehrdad Vahebi Nojehdeh; Behrooz Arezoo
      Pages: 17 - 30
      Abstract: Publication date: Available online 6 September 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Mehrdad Vahebi Nojehdeh, Behrooz Arezoo
      Rotary axes error motions of five-axis CNC machine tools affect dimensional, geometrical and form accuracy of machined features according to structural design and sensitive direction considerations. Work carrying kinematic chains mostly use one rotary axis in radial Fixed Sensitive Direction (radial FSD) setup. The application keeps workpiece axis coaxial with the axis of rotation, preparing more flexibility for machining of complicated features. In spite of conspicuous advantages, in case of poor geometrical quality of machined features, lack of knowledge about error patterns makes the error source isolation process more difficult. This paper investigates the consequences of cycling error motions of radial FSD work-holding rotary axes, in order to prepare intuitive knowledge about possible error patterns. A virtual cutting module equipped with an error-mapping model is generated to simulate the cutting process in vicinity of different error motion scenarios. As a novel approach, comparison of measured deviations with available error patterns facilitates the error source isolation. Experimental results conducted on airfoil cutting process verified the effectiveness of the presented method.

      PubDate: 2016-09-07T18:45:00Z
      DOI: 10.1016/j.ijmachtools.2016.09.002
      Issue No: Vol. 111 (2016)
       
  • Analysis, optimization and accuracy assessment of special-purpose portable
           machines by virtual techniques
    • Authors: J. Eguia; L. Uriarte; A. Lamikiz
      Pages: 31 - 42
      Abstract: Publication date: Available online 21 September 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): J. Eguia, L. Uriarte, A. Lamikiz
      This paper proposes a streamlined method to model, analyze and assess the overall performance of small mobile machines that can move along large parts to perform the required machining operations, conventionally called portable machines. The method is based on virtualization techniques and combines a process-force mechanistic model and a reduced machine stiffness model synthesized from virtual and experimental reduced models of subsystems. The model is used to assess and improve the performance of portable machines by examining the time-domain response of the tool centre point in representative operations, rather than limiting the study to the frequency domain. A practical application to a particular portable machine is presented and used to conduct the presentation of the work. With the results of the analysis, the accuracy of the use of the portable machines is studied. The procedure also proves to be a useful tool to optimize the machine design to fit particular applications. The method has been experimentally evaluated in a conventional three axis milling machine to ensure the accuracy of the simulations.

      PubDate: 2016-09-24T08:04:24Z
      DOI: 10.1016/j.ijmachtools.2016.09.006
      Issue No: Vol. 111 (2016)
       
  • Micro-Macro-Mechanical Model and Material Removal Mechanism of Machining
           Carbon Fiber Reinforced Polymer
    • Authors: Bin Niu; Youliang Su; Rui Yang; Zhenyuan Jia
      Pages: 43 - 54
      Abstract: Publication date: Available online 14 September 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Bin Niu, Youliang Su, Rui Yang, Zhenyuan Jia
      The present paper studies the material removal mechanism of machining carbon fiber reinforced polymer (CFRP) by a micro-mechanical model, and proposes prediction models of cutting forces from the microscale to the macroscale. At the microscale, the micro-mechanical model for cutting a fiber in orthogonal cutting CFRP is established via the elastic foundation beam theory with explicit description of the carbon fiber and the matrix. The deflection and failure of the fiber constrained by the surrounding composite are analysed under the cutting effects by the tool edge. In addition, the fiber failure under the pressing of the flank face is analysed based on the undulating fiber theory. Analytical expressions are established at the microscale for evaluating the force for cutting a single fiber and the compression force for a single fiber from the flank face. At the macroscale, the chip length is determined by analyzing the characteristics of the cutting force signals of orthogonal cutting experiments. The characteristic chip length is used for establishing the trans-scale prediction model of cutting forces from the microscale to the macroscale. The total cutting and thrust forces at the macroscale during the formation of a chip are predicted based on the micro-mechanical results and the characteristic chip length, which agree well with the experimental results for orthogonal cutting of CFRP. Furthermore, the fiber failure modes and the debonding between the fiber and the matrix under different supporting conditions are discussed by the micro-mechanical model, by which subsurface damages are recognized.

      PubDate: 2016-09-19T05:23:41Z
      DOI: 10.1016/j.ijmachtools.2016.09.005
      Issue No: Vol. 111 (2016)
       
  • Actual inverse kinematics for position-independent and position-dependent
           geometric error compensation of five-axis machine tools
    • Authors: Shuang Ding; Xiaodiao Huang; Chunjian Yu; Wei Wang
      Pages: 55 - 62
      Abstract: Publication date: Available online 6 October 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Shuang Ding, Xiaodiao Huang, Chunjian Yu, Wei Wang
      This paper proposes an efficient actual inverse kinematics method to compensate the geometric errors of five-axis machine tools. The analytical expressions of corrected numerical control (NC) code are derived according to the invertibility, associative law of multiplication, and block calculation of homogenous transformation matrix (HTM). No additional analysis and models are needed for the compensated expressions, appropriate conversion with the geometric error model based on HTM is sufficient. It is simple, convenient and universal for geometric error compensation. The corrected NC code can be obtained through algebraic operation, without time-consuming iteration, differential, or pseudo-inverse algorithm. Then compensation accuracy and efficiency of the method are simulated. And the results indicate higher efficiency compared to existing method. At last, the method is verified by cutting experiment on a five-axis machine tool. Both simulation and experiment results can validate the feasibility of the method. The proposed method significantly improves the computation efficiency and is considered more suitable for real-time compensation.

      PubDate: 2016-10-08T14:18:23Z
      DOI: 10.1016/j.ijmachtools.2016.10.001
      Issue No: Vol. 111 (2016)
       
  • An Analytical Index Relating Cutting Force to Axial Depth of Cut for
           Cylindrical End Mills
    • Authors: Weijian Huang; Xi Li; Boxing Wang; Jihong Chen; Ji Zhou
      Pages: 63 - 67
      Abstract: Publication date: Available online 6 October 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Weijian Huang, Xi Li, Boxing Wang, Jihong Chen, Ji Zhou
      In milling processes, the ever-changing cutting force has great effects on machining quality. A novel cutting force model for cylindrical end mills, discretizing the end mill along its circumferential direction, is described in this paper. An analytical index is established for simplifying the prediction for the cutting force and estimating the fluctuation of it based on the model. The influences of the axial depth of cut on the cutting force and the fluctuation are studied based on the proposed index. The predictions of the analytical index are verified by milling experiments.

      PubDate: 2016-10-08T14:18:23Z
      DOI: 10.1016/j.ijmachtools.2016.10.003
      Issue No: Vol. 111 (2016)
       
  • Investigation on a new hole-flanging approach by incremental sheet forming
           through a featured tool
    • Authors: Tingting Cao; Bin Lu; Hengan Ou; Hui Long; Jun Chen
      Pages: 1 - 17
      Abstract: Publication date: Available online 9 August 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Tingting Cao, Bin Lu, Hengan Ou, Hui Long, Jun Chen
      One of the major challenges in conventional incremental sheet forming (ISF) is the extreme sheet thinning resulted in an uneven thickness distribution of formed part. This is also the case for incrementally formed parts with hole-flanging features. To overcome this problem, a new ISF based hole-flanging processing method is proposed by developing a new ISF flanging tool. Comparative studies are conducted by performing hole-flanging tests using both ISF conventional ball-nose tool and the new flanging tool to evaluate the sheet deformation behavior and the quality of the final part. Stress distribution and strain variation are investigated by analytical approach and numerical simulation. Experiments have been conducted to validate the analytical model and simulation results, and to further study the fracture behavior. Results show that the new flanging tool generates greater meridional bending than stretching deformation in conventional ISF. The combination of bending-dominated deformation mode with localized deformation of ISF ensures more uniform thickness distribution on hole-flanging part with better resistance to fracture.

      PubDate: 2016-08-13T20:32:40Z
      DOI: 10.1016/j.ijmachtools.2016.08.003
      Issue No: Vol. 110 (2016)
       
  • Prediction of Rounding Phenomenon at Corner Tips in Large-area Electron
           Beam Irradiation
    • Authors: Togo Shinonaga; Akira Okada; Tomoaki Miyoshi
      Pages: 18 - 26
      Abstract: Publication date: Available online 11 August 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Togo Shinonaga, Akira Okada, Tomoaki Miyoshi
      In large-area electron beam (EB) irradiation method, corner tip of workpiece is generally rounded since removal of material at the tip is done preferentially. Investigation of the shape change is necessary to clarify rounding phenomenon with irradiation of EB. In this study, the shape changes of corner tips were experimentally investigated by Scanning Electron Microscope (SEM) observation of the cross sections. Then, electron track analysis in the EB irradiation was conducted to clarify an electron concentration at the tip. Unsteady heat conduction analysis at the tip was also done with considering the EB concentration at the tip and an electron penetration effect into the surface. The shape changes were estimated by simulation of temperature distribution at the tips. Experimental results show that the curvature radius increases with shot number of EB. The estimated shape changes show quantitatively good agreement with the experimental ones. These results indicate that the rounding phenomenon at the tips by large-area EB irradiation can be predicted by our electron track and unsteady heat conduction analysis model.

      PubDate: 2016-08-13T20:32:40Z
      DOI: 10.1016/j.ijmachtools.2016.08.002
      Issue No: Vol. 110 (2016)
       
  • From the microscopic interaction mechanism to the grinding temperature
           field: An integrated modelling on the grinding process
    • Authors: Jingliang Jiang; Peiqi Ge; Shufeng Sun; Dexiang Wang; Yuling Wang; Yong Yang
      Pages: 27 - 42
      Abstract: Publication date: Available online 17 August 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Jingliang Jiang, Ge Peiqi, Shufeng Sun, Dexiang Wang, Yuling Wang, Yong Yang
      The microscopic interaction mechanism between grains and workpiece material in grinding contact zone is extremely complicated which will take many interrelated and coupled factors into consideration, such as grinding wheel topographies, grain distributions, physical and mechanical properties of material, the emergence of grinding forces and heat energies, the partitioning and transfer of grinding heat, etc. However, the current theories and models are unable to integrate all of the above factors into an organic-whole model. Former researchers usually focused on several of above aspects and made assumptions to simplify those theories. However, these assumptions will weaken the mathematical relationship between grinding conditions and ground surface qualities and will increase the difficulties of understanding on the nature of grinding process. The work of this paper is an attempt on this purpose. It is based on the author's previous work of a microscopic interaction mechanism model between grains and workpiece material in grinding contact zone which will describe the interaction situation of a grain with any size, protrusion height and location, then the distributions of each type of grains were obtained. Single plowing and cutting grain force models were developed based on R.L. Hecker's single grain force model and M.E. Merchant's metal cutting theory, then led into grinding force distribution. The heat partition ratio model of W.B. Rowe was applied on the discrete grinding contact zone, a new developed heat flux profile transferred into workpiece surface was obtained, which was usually assumed to be rectangular, triangular and parabolic in shape in former researches. In order to confirm the rationality of this new heat flux profile, a comparison on temperature fields and grinding forces has been made between results from FE-models and experiments, under both wet and dry grinding conditions. Comparison results showed that this new developed integrated grinding process model has more precise prediction ability on grinding forces and grinding temperatures.

      PubDate: 2016-08-17T20:55:41Z
      DOI: 10.1016/j.ijmachtools.2016.08.004
      Issue No: Vol. 110 (2016)
       
  • Discrete-element modelling of the grinding contact length combining the
           wheel-body structure and the surface-topography models
    • Authors: J.L. Osa; J.A. Sánchez; N. Ortega; I. Iordanoff; J.L. Charles
      Pages: 43 - 54
      Abstract: Publication date: Available online 6 July 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): J.L. Osa, J.A. Sánchez, N. Ortega, I. Iordanoff, J.L. Charles
      Phenomena governing the grinding process are largely related to the nature and evolution of contact between grinding wheel and ground component. The definition of the contact area plays an essential role in the simulation of grinding temperatures, forces or wear. This paper presents a numerical model that simulates the contact between grinding wheel and workpiece in surface grinding. The model reproduces the granular structure of the grinding wheel by means of the discrete element method. The surface topography is applied on the model surface taking into account the dressing mechanisms and movements of a single-point dresser. The individual contacts between abrasive grits and workpiece are studied regarding the uncut chip thickness, assuming viscoplastic material behaviour. Simulation results are evaluated with experimental measurements of the contact length. The results remark the importance of surface topography and dressing conditions on the contact area, as well as wheel deflection.

      PubDate: 2016-07-09T14:28:48Z
      DOI: 10.1016/j.ijmachtools.2016.07.004
      Issue No: Vol. 110 (2016)
       
  • Novel Drill Structure for Damage Reduction in Drilling CFRP Composites
    • Authors: Zhenyuan Jia; Rao Fu; Bin Niu; Baowei Qian; Yu Bai; Fuji Wang
      Pages: 55 - 65
      Abstract: Publication date: Available online 21 August 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Zhenyuan Jia, Rao Fu, Bin Niu, Baowei Qian, Yu Bai, Fuji Wang
      Drilling holes on CFRP components is inevitable for assembling process in the aviation industry. The drilling-induced damages frequently occur and affect not only the load carrying capacity of components but also the reliability. Therefore, it is of great urgency to enhance drilling quality on CFRP components. The article aims to propose a novel drill structure to change the cutting conditions at the drill exit and effectively reduce damages in drilling CFRP. Considering the drilling-exit constraint condition, a unique two-dimensional cutting model is established to represent the axial cutting of the main cutting edge at the drill exit. Based on the model, the effects of point of action and cutting direction on material removal at the exit are investigated, and the result indicates that cutting CFRP in the upward direction has positive effects on deflection limitation and damage reduction. In order to perform the upward cutting, a novel intermittent-sawtooth drill structure is proposed on the one-shot drill. The theoretical and geometrical analyses of the drilling process reveal that the cutting lips of the structure could reverse the cutting direction from downward to upward and thereby, reduce the drill-exit damages. Furthermore, drilling experiments are conducted and the drill structure is proved to be effective to reduce drilling damages as expected.

      PubDate: 2016-08-23T08:35:00Z
      DOI: 10.1016/j.ijmachtools.2016.08.006
      Issue No: Vol. 110 (2016)
       
  • Modeling and application of ring stiffness condition for radial-axial ring
           rolling
    • Authors: Lin Hua; Jiadong Deng; Dongsheng Qian; Jian Lan; Hui Long
      Pages: 66 - 79
      Abstract: Publication date: Available online 7 September 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Lin Hua, Jiadong Deng, Dongsheng Qian, Jian Lan, Hui Long
      Radial-axial ring rolling (RARR) is an advanced incremental metal-forming technology for manufacturing various seamless rings, especially for large scale rings. A primary problem for RARR is to facilitate rolling process stable and form a ring with good dimension and performance. However, RARR is an extremely complex dynamic rolling process with high flexibility. To reasonably control guide roll is an important approach to keep rolling process stable during RARR. In this paper, a mathematical model of ring stiffness condition for RARR was established based on the force method. Then the influence factors to ring stiffness were discussed, especially the section bending moment factor. To verify the ring stiffness model, finite element (FE) simulation was adopted. In addition, a comparison of different ring stiffness models was made. It can be found the proposed stiffness model has a high accuracy. Furthermore, a control method of the pressure in the hydraulic cylinder to adjust the guiding force based on the stiffness model was proposed. By FE simulation of RARR, an appropriate adjustment coefficient to determine the guiding force was obtained. Finally, an experiment of RARR for a large ring was carried out. The rolling process was very smooth and steady, and a super-large ring with diameter more than 9 m was manufactured successfully.

      PubDate: 2016-09-12T19:19:48Z
      DOI: 10.1016/j.ijmachtools.2016.09.003
      Issue No: Vol. 110 (2016)
       
  • The Effects of Fluid Vapor Pressure and Viscosity on the Shapes of
           Abrasive Slurry-jet Micro-machined Holes and Channels
    • Authors: K. Kowsari; M.H. Amini; M. Papini; J.K. Spelt
      Pages: 80 - 91
      Abstract: Publication date: Available online 9 September 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): K. Kowsari, M.H. Amini, M. Papini, J.K. Spelt
      Abrasive slurry jet micro-machining (ASJM) can etch micro-features such as holes and channels in virtually any material. Holes, and to a lesser extent, channels machined in brittle materials using ASJM typically suffer from substantial edge rounding near the opening. This study investigated the erosive mechanism responsible for the rounding in borosilicate glass and sintered zirconium tin titanate targets, and determined the process parameters capable of minimizing the effect. Computational fluid dynamics (CFD) showed that the rounding that occurred during ASJM with a water-based slurry was due to the impact of particles accelerated by the formation and collapse of cavitation bubbles in regions where local pressures were below the vapor pressure of water. Further evidence of this was obtained by comparing the micro-topography in these regions with that produced by an ultrasonic cavitation apparatus in a water-particle slurry. Cavitation-enhanced erosion in ASJM was minimized using liquids such as mineral or soybean oil that have relatively low vapor pressures, resulting in blind and through-holes having sharp entrance and exit holes in glass and sintered zirconium tin titanate. The increased viscosity of the test fluids also altered the particle trajectories observed in the CFD models, causing the cross-sectional shape of the holes to have flatter bottoms and steeper sidewalls. In ductile targets such as copper, edge rounding due to cavitation-enhanced erosion was found to be much smaller than in brittle targets. In glass channels, the use of a soybean oil-based slurry eliminated the edge rounding and resulted in flatter bottoms, but increased the width by approximately 20%.

      PubDate: 2016-09-12T19:19:48Z
      DOI: 10.1016/j.ijmachtools.2016.09.004
      Issue No: Vol. 110 (2016)
       
  • Method for identifying feed-drive system dynamic properties using a motor
           current
    • Authors: Xing Liu; Xinyong Mao; Hongqi Liu; Bin Li; Chuangfu Guan; Zisheng Zhang; Bo Luo; Fangyu Peng
      Pages: 92 - 99
      Abstract: Publication date: Available online 1 September 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Xing Liu, Xinyong Mao, Hongqi Liu, Bin Li, Chuangfu Guan, Zisheng Zhang, Bo Luo, Fangyu Peng
      The dynamics of a machine tool ball screw is an important topic in high-precision machining. Capturing the axial and torsional dynamics of the ball screw has an important guiding significance to the stable processing of the machine tool. The traditional methods mainly involve a mounted sensor or direct embedment into the structure and hybrid finite element methods (FEMs), which are inconvenient. The FEM accuracy is limited by the accuracy of the model. This paper reports that feed-drive system vibration is excited by the interactive impact of a screw, ball, and nut, whose interaction is the core of the feed-drive system dynamics. Under the action of current, the ball screw serves as the transmission component of the executive component to control the working condition of the sliding table. This paper proposes a new method that uses the inertia force sequence caused by random idle running of the sliding table to identify the natural frequency of a feed-drive system based on the feed motor current response. First, the corresponding relationship between the current and the vibration of the feed-drive system is studied. The accuracy of the new method based on the current response is analysed by the experiment, which is performed to identify the natural frequency of the feed-drive system. Then, the incentive region is changed to study the identification effect under different interactive impact conditions, where the contact condition of the ball screw is different.

      PubDate: 2016-09-01T17:04:54Z
      DOI: 10.1016/j.ijmachtools.2016.08.007
      Issue No: Vol. 110 (2016)
       
  • Cutting force prediction for ultra-precision diamond turning by
           considering the effect of tool edge radius
    • Authors: P. Huang; W.B. Lee
      Pages: 1 - 7
      Abstract: Publication date: Available online 23 June 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): P. Huang, W.B. Lee
      Many studies have been conducted to develop algorithms for cutting force prediction in a variety of machining process. However, few studies have developed the cutting force prediction algorithm by considering the effect of tool edge radius in ultra-precision diamond turning, including fast tool servo/slow tool servo assisted diamond turning. This paper presents a cutting force prediction algorithm for the ultra-precision diamond turning, which is able to take into account the effect of tool edge radius. The developed algorithm is general for predicting cutting force in most cylindrical diamond turning processes such as fast tool servo/ slow tool servo assisted diamond turning. Experiments are conducted to validate the cutting force prediction algorithm. The experimental results verify the assumed relationship between the chip formation and the minimum chip thickness, where the work material is entirely removed when the uncut chip thickness is larger than a certain value. The estimated value of minimum chip thickness is obtained. The measured cutting force shows good agreement with the simulated value. In addition, the friction induced vibration due to elastic recovery occurs when a worn diamond cutting tool is adopted in the experiment.

      PubDate: 2016-06-26T17:37:50Z
      DOI: 10.1016/j.ijmachtools.2016.06.005
      Issue No: Vol. 109 (2016)
       
  • Textured grinding wheels: A review
    • Authors: Hao Nan Li; Dragos Axinte
      Pages: 8 - 35
      Abstract: Publication date: Available online 6 July 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Hao Nan Li, Dragos Axinte
      Textured grinding wheels (TGWs) are wheels that have both specially-designed active and passive grinding areas on their geometrically active surfaces. The active area allows TGWs to perform the intermittent grinding process such that total wheel-workpiece contact time, average grinding forces and temperature in the cutting zone can be reduced. The passive area (or textures) refers to the non-grinding area where no grain is located at and the main functions of it include serving as reservoirs to transport more coolants/lubricants into the grinding zone and providing larger chip disposal space. With the increasingly demanding requirements from industries, the continuous evolution of TGWs has been enforced. However, to the best of the authors’ knowledge, no comprehensive review on TGWs has been reported yet. To address this gap in the literature, this paper aims to present an informative literature survey of research and engineering developments in relation to TGWs, define and categorise TGW concepts, explain basic principles, briefly review the concept developments, discuss key challenges, and further provide new insights into understanding of TGWs for their advanced future engineering applications.

      PubDate: 2016-07-09T14:28:48Z
      DOI: 10.1016/j.ijmachtools.2016.07.001
      Issue No: Vol. 109 (2016)
       
  • Chatter Prediction for the Peripheral Milling of Thin-walled Workpieces
           with Curved Surfaces
    • Authors: Yun Yang; Wei-Hong Zhang; Ying-Chao Ma; Min Wan
      Pages: 36 - 48
      Abstract: Publication date: Available online 5 July 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Yun Yang, Wei-Hong Zhang, Ying-Chao Ma, Min Wan
      Workpiece dynamics is the dominant factor which should be taken into consideration in chatter prediction of peripheral milling of thin-walled workpieces. Usually, material removal, tool position and varying dynamic displacements of the workpiece along the tool axis influence the workpiece dynamics. However, these three aspects were not considered simultaneously in the existing researches. This paper comprehensively investigates the effect of varying workpiece dynamics on the stability in peripheral milling of thin-walled workpieces with curved surfaces. A new dynamic model of tool and workpiece system is proposed to consider the dynamic behavior of tool and workpiece as well as the influences of engagement and tool feed direction. Interaction between tool and thin-walled workpiece is modeled at discrete nodes along the axial depth of cut. An efficient method based on structural dynamic modification scheme is developed to characterize the effect of material removal upon the in-process workpiece dynamics. This is done by only performing modal analysis on the FEM model of initial workpiece, while mode shapes and natural frequencies of the in-process workpiece can be calculated without re-building and re-meshing the instant FEM model at each tool position. The proposed model and method are verified by the milling process of two thin-walled workpieces concerning a plate and a workpiece with curved surface. Comparisons of numerical and experimental results show that chatter can be accurately predicted for the peripheral milling of thin-walled workpieces.

      PubDate: 2016-07-09T14:28:48Z
      DOI: 10.1016/j.ijmachtools.2016.07.002
      Issue No: Vol. 109 (2016)
       
  • Performance and modeling of Paired polishing process
    • Authors: Tianyu Yu; David T. Asplund; Ashraf F. Bastawros; Abhijit Chandra
      Pages: 49 - 57
      Abstract: Publication date: Available online 7 July 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Tianyu Yu, David T. Asplund, Ashraf F. Bastawros, Abhijit Chandra
      Paired polishing process (PPP) is a variant of the chemical mechanical polishing process which facilitates defect mitigation via minimization of maximum force as well as effective planarization via profile driven determination of force gradient. The present embodiment of PPP machine employs two polishing wheels, radially spanning the wafer surface on a counter-gimbaled base. The PPP machine is deployed to experimentally investigate the role of the process parameters on the surface roughness evolution, and the effective material removal rate. Two sets of copper and aluminum blanket layers were polished under a range of applied down force, polishing wheel speed and transverse feed rate to examine the scalability of the process parameters for different material constants. The experimental measurements along with the topological details of the polishing pad have been utilized to develop a mechanistic model of the process. The model employs the soft wheel-workpiece macroscopic contact, the polishing wheel roughness and its amplification to the local contact pressure, the kinematics of abrasive grits at the local scale, and the collective contribution of these individual micro-events to induce an effective material removal rate at the macroscale. The model shows the dependence of the material removal on the ratio of wheel rotational to feed speed for the PPP process, in a form of an asymptote that is scaled by the surface hardness of each material. The PPP machine exploits this insight and utilizes an oblique grinding technique that obviates the traditional trade-off between MRR and planarization efficiency.

      PubDate: 2016-07-09T14:28:48Z
      DOI: 10.1016/j.ijmachtools.2016.07.003
      Issue No: Vol. 109 (2016)
       
  • Relationship between temperature at cut front edge and kerf quality in
           fiber laser cutting of Al–Cu aluminum alloy
    • Authors: Cong Chen; Ming Gao; Xiaoyan Zeng
      Pages: 58 - 64
      Abstract: Publication date: October 2016
      Source:International Journal of Machine Tools and Manufacture, Volume 109
      Author(s): Cong Chen, Ming Gao, Xiaoyan Zeng
      The characteristics of the temperature at cut front edge (Tce ) during fiber laser cutting of AA2219 aluminum alloy were studied. A temperature monitoring system employing an infrared laser thermometer was established to record the time-domain T ce . A series of experiments was carried out to explore the relationship between the T ce and kerf quality. There was an optimal T ce range of 1800–1950°C for accepted kerf. By calculating the forces acting on molten pool, the existence of the optimal T ce range was demonstrated, and the effect of the T ce on kerf quality was discussed. The kerf quality was mostly dependent on the angle of the resultant to the downward (θ). Only when the θ was around the minimum of 38° that is corresponding to optimal T ce range, the kerf was accepted because the liquid metal was pushed away smoothly, although the resultant value was small. When increasing or decreasing the T ce outside the optimal range, the kerf was bad because the increased θ intended to push the liquid metal backward to attach on the kerf rather than push them away.

      PubDate: 2016-07-29T19:41:48Z
      DOI: 10.1016/j.ijmachtools.2016.07.008
      Issue No: Vol. 109 (2016)
       
  • A predictive model of grinding force in silicon wafer self-rotating
           grinding
    • Authors: Jinglong Sun; Fei Qin; Pei Chen; Tong An
      Pages: 74 - 86
      Abstract: Publication date: Available online 27 July 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Jinglong Sun, Fei Qin, Pei Chen, Tong An
      Silicon wafer thinning is mostly performed by the method of self-rotating grinding. In grinding, the grinding force is a crucial factor of affecting the grinding performance, form accuracy and surface/subsurface thinning quality. To control the thinning quality of ground wafer, grinding force is the most essential factor need to be controlled. However, no theoretical model is developed to correlate grinding parameters to grinding force yet. In this article, a theoretical model is established based on the removal behavior of silicon, including cutting and sliding. For the first time, the effects of processing parameters, wafer radial distance and crystal orientation on grinding force are quantitatively described in a theoretical model. Excess grinding force causes local damage of wafer in the form of subsurface cracks, as a determinant factor on the quality of wafer. Therefore, nine sets of self-rotating grinding experiments with variable processing parameters are performed, and the depth of subsurface cracks h are measured to evaluate the damage of ground wafer. Based on the scratching theory of single abrasive grain, the relationship between h and the normal grinding force F nt is found, which is also validated by the experimental results. Finally, an optimized two-stage process is proposed to control subsurface cracks and improve material removal rate simultaneously, according to the predictive model of grinding force.

      PubDate: 2016-07-29T19:41:48Z
      DOI: 10.1016/j.ijmachtools.2016.07.009
      Issue No: Vol. 109 (2016)
       
  • Pulsed ultrasonic assisted electrical discharge machining for finishing
           operations
    • Authors: M. Goiogana; J.A. Sarasua; J.M. Ramos; L. Echavarri; I. Cascón
      Pages: 87 - 93
      Abstract: Publication date: Available online 15 July 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): M. Goiogana, J.A. Sarasua, J.M. Ramos, L. Echavarri, I. Cascón
      Electrical Discharge Machining (EDM) is a non-conventional machining process specially suitable for manufacturing hard-to-machine materials or geometrically complex parts. Many investigations have been presented combining EDM with ultrasonic (US) vibration of the electrode, but most of them have been intended to enhance the material removal rate of the process. In this paper US assisted EDM process has been used in order to improve the surface roughness in a finishing operation. For that purpose a copper rod tool electrode and a 1.2344 tempered alloy steel workpiece have been used. A pulsed US assisted EDM mode (PUEDM) has been developed and compared with the current EDM process and EDM assisted with continuous US vibration (UEDM). The results show that PUEDM process can improve the surface roughness and homogeneity of the machined surfaces in finishing EDM operations.

      PubDate: 2016-07-18T11:38:26Z
      DOI: 10.1016/j.ijmachtools.2016.07.005
      Issue No: Vol. 109 (2016)
       
  • A review of geometrical and microstructural size effects in micro-scale
           deformation processing of metallic alloy components
    • Authors: M.W. Fu; J.L. Wang; A.M. Korsunsky
      Pages: 94 - 125
      Abstract: Publication date: Available online 28 July 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): M.W. Fu, J.L. Wang, A.M. Korsunsky
      Plastic deformation at the macroscopic scale has been widely exploited in industrial practice in order to obtain desired shape and control the requested properties of metallic alloy parts and components. The knowledge of deformation mechanics involved in various forming processes has been systematically advanced over at least two centuries, and is now well established and widely used in manufacturing. However, the situation is different when the physical size of the workpiece is scaled down to the micro-scale (µ-scale). In such cases the data, information and insights from the macro-scale (m-scale) deformation mechanics are no longer entirely valid and fully relevant to µ-scale deformation behavior. One important reason for the observed deviation from m-scale rules is the ubiquitous phenomenon of Size Effect (SE). It has been found that the geometrical size of workpiece, the microstructural length scale of deforming materials and their interaction significantly affect the deformation response of µ-scale objects. This observation gives rise to a great deal of research interest in academia and industry, causing significant recent effort directed at exploring the range of related phenomena. The present paper summarizes the current state-of-the-art in understanding the geometrical and microstructural SEs and their interaction in deformation processing of µ-scale components. The geometrical and grain SEs in µ-scale deformation are identified and articulated, the manifestations of the SE are illustrated and the affected phenomena are enumerated, with particular attention devoted to pointing out the differences from those in the corresponding m-scale domain. We elaborate further the description of the physical mechanisms underlying the phenomena of interest, viz., SE-affected deformation behavior and phenomena, and the currently available explanations and modeling approaches are reviewed and discussed. Not only do the SEs and their interaction affect the deformation-related phenomena, but they also induce considerable scatter in properties and process performance measures, which in turn affects the repeatability and reliability of deformation processing. This important issue has become a bottleneck to the more widespread application of µ-scale deformation processing for mass production of µ-scale parts. What emerges is a panoramic view of the SE and related phenomena in µ-scale deformation processing. Furthermore, thereby the outstanding issues are identified to be addressed to benefit and promote practical applications.
      Graphical abstract image

      PubDate: 2016-07-29T19:41:48Z
      DOI: 10.1016/j.ijmachtools.2016.07.006
      Issue No: Vol. 109 (2016)
       
  • Crack-free ductile mode grinding of fused silica under controllable dry
           grinding conditions
    • Authors: Wei Wang; Peng Yao; Jun Wang; Chuanzhen Huang; Hongtao Zhu; Bin Zou; Hanlian Liu; Jiwang Yan
      Pages: 126 - 136
      Abstract: Publication date: Available online 21 July 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Wei Wang, Peng Yao, Jun Wang, Chuanzhen Huang, Hongtao Zhu, Bin Zou, Hanlian Liu, Jiwang Yan
      A crack-free ductile mode grinding of fused silica was realized by a controllable dry grinding process in this research, which is attributed to the improvement of fused silica's ductile machinability induced by the high grinding temperature. The plastic deformation of fused silica consists of shear flow and densification. Plastic deformation mechanisms and cracking behaviors related to densification were investigated firstly by high temperature nanoindentation experiments to reveal the ductile-brittle transition mechanisms. Fused silica exhibits less densification and more shear flow at high temperature than room temperature. The critical ductile-brittle transition load of fused silica is lower at high temperature than room temperature. These results may lead to the improvement of the fused silica's ductile machinability at high temperature. Dry grinding experiments were conducted to investigate the effect of grinding depth. A mathematical model is established to predict the maximum temperature in workpiece. A novel infrared radiation (IR) transmission on-line measurement method was presented to acquire the workpiece temperature in the contact zone directly. The predicted results coincide well with the experiment results. Contrary to the conventional experience, a large grinding depth is beneficial for the surface quality and integrity in the dry grinding of fused silica due to the increased grinding temperature; however, the excessive grinding depth results in grinding wheel burn. The ductile grinding depth of the fused silica increases from sub-micrometers to 5μm by dry grinding which makes the grinding process more controllable and effective.

      PubDate: 2016-07-25T11:48:25Z
      DOI: 10.1016/j.ijmachtools.2016.07.007
      Issue No: Vol. 109 (2016)
       
  • Chip Formation and Microstructure Evolution in the Adiabatic Shear Band
           When Machining Titanium Metal Matrix Composites
    • Authors: Roland Bejjani; Marek Balazinski; Helmi Attia; Philippe Plamondon; Gilles L’Éspérance
      Pages: 137 - 146
      Abstract: Publication date: Available online 3 August 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Roland Bejjani, Marek Balazinski, Helmi Attia, Philip Plamondon, Gilles L’Éspérance
      Titanium Metal Matrix Composite (Ti-MMC) is a relatively new class of material, which has high potential applications in the aeronautical and biomedical sectors. Similar to titanium alloys, Ti-MMC produces segmented chips, which are characterized by Adiabatic Shear Bands (ASB). Transmission Electron Microscopy (TEM) observations were performed and dislocations were observed on the atomic scale. Furthermore, the sheared surfaces, as well as the effects of the hard TiC particles on the ASB formation were investigated. It was shown that the grains located in the lightly strained areas within the chip segment are characterized by a high dislocation density. This is contrary to the highly strained areas inside the ASB, where the temperature was estimated to be close to the recrystallization temperature. Analysis of the results showed that no phase transformation took place inside the ASB. The strain and strain rate in the ASB were estimated to reach 7.5 and 4.5x105 s−1, respectively. Using TEM and Focused Ion Beam (FIB) for sample preparation, the microstructure inside the ASB was found to be composed of elongated and equiaxed nano-sized grains. The segmentation mechanism of chips was observed to start from a crack on the material free surface ahead of the tool, and not at the tool tip. Furthermore, the hard particles inside the matrix were found not to be hindering, or retarding the ASB formation. A microstructural evolution model, based on these observations, has also been proposed. To the authors’ best knowledge, TEM studies of ASB for Ti-MMC were never done previously for machining applications.

      PubDate: 2016-08-04T20:04:32Z
      DOI: 10.1016/j.ijmachtools.2016.08.001
      Issue No: Vol. 109 (2016)
       
  • Improving machined surface texture in avoiding five-axis singularity with
           the acceptable-texture orientation region concept
    • Authors: Zhiwei Lin; Jianzhong Fu; Hongyao Shen; Guanhua Xu; Yangfan Sun
      Pages: 1 - 12
      Abstract: Publication date: September 2016
      Source:International Journal of Machine Tools and Manufacture, Volume 108
      Author(s): Zhiwei Lin, Jianzhong Fu, Hongyao Shen, Guanhua Xu, Yangfan Sun
      The singular phenomenon is common in five-axis machining process. Most of the existing methods try to solve the problem by deforming the tool orientations or inserting extra cutter locations after the tool path is generated, with the drawbacks that (1) the machining geometry errors are not respected and (2) irregular machined surface textures might be caused. This paper dedicates to improve the machined surface textures in the scenario of avoiding the five-axis singularities. In this paper, the acceptable-texture orientation region (ATOR) concept is proposed. If the tool orientation is picked inside the ATOR, the resulted surface texture is considered to be acceptable. Based on this concept, the tool orientations are optimized locally. For a given tool path, if the orientation curve crosses the singular circle, it is locally modified out of the circle with a bridge point locating schema and a cubic B-spline interpolation technique. Eventually, the obtained new orientation curve goes around the singular circle like a rubber band to avoid the singular problem and remains unmodified to achieve the best machined surface qualities for the rest pieces. As the process is implemented at the tool path planning stage, the machining geometry errors can also be respected.

      PubDate: 2016-06-16T18:04:30Z
      DOI: 10.1016/j.ijmachtools.2016.05.006
      Issue No: Vol. 108 (2016)
       
  • Modeling and simulation of the high-speed milling of hardened steel SKD11
           (62 HRC) based on SHPB technology
    • Authors: Chengyong Wang; Feng Ding; Dewen Tang; Lijuan Zheng; Suyang Li; Yingxing Xie
      Pages: 13 - 26
      Abstract: Publication date: September 2016
      Source:International Journal of Machine Tools and Manufacture, Volume 108
      Author(s): Chengyong Wang, Feng Ding, Dewen Tang, Lijuan Zheng, Suyang Li, Yingxing Xie
      An easy-to-produce sawtooth chip is the main feature of the high-speed milling of hardened steel. In previous works, a theoretical geometric model was proposed for the sawtooth chip formation to predict the strain and strain rate in the shear band during chip formation; these properties are important when describing the deformation characteristics for the cutting of hardened steel materials. In the cutting process, however, the changes and distributions of stress and strain can hardly be obtained using a theoretical model. This paper modifies the conventional empirical Johnson–Cook constitutive equation by employing stress–strain curves at high temperature and a high strain rate obtained using split Hopkinson pressure bar technology and considering the negative strain rate effect and temperature effect of the material, especially for SKD11 (62 HRC) hardened steel. A thermo-mechanical coupled two-dimensional planar strain finite element model for the high-speed milling of SKD11 hardened steel with a modified Johnson–Cook constitutive equation is presented. The geometric characteristics of chip formation during the high-speed milling of SKD11 are predicted and the results are in good agreement with experimental results. Employing the modified finite element model, the stress and strain in the shear band during high-speed cutting are quantitatively analyzed and found to be in close agreement with the results of a theoretical model analysis. It is found that the cutting speed has a critical value at which the stress and strain reach a certain value and the distributions of stress and strain change in the shear band, resulting in the generation of a sawtooth chip. Moreover, the cutting force, cutting temperature, and selection of a coated tool are discussed according to results obtained with the modified finite element model. The cutting force and difference in temperature decrease while the temperature increases as the cutting speed increases. Compared with a TiAlN-coated tool, a TiSiN-coated tool performs better in cutting SKD11 hardened steel in terms of the cutting temperature.

      PubDate: 2016-06-16T18:04:30Z
      DOI: 10.1016/j.ijmachtools.2016.05.005
      Issue No: Vol. 108 (2016)
       
  • Kinematic corner smoothing for high speed machine tools
    • Authors: Shingo Tajima; Burak Sencer
      Pages: 27 - 43
      Abstract: Publication date: September 2016
      Source:International Journal of Machine Tools and Manufacture, Volume 108
      Author(s): Shingo Tajima, Burak Sencer
      This paper presents a novel kinematic corner smoothing technique for high-speed CNC machine tools. Typically, reference tool-paths compromised of short G01 moves are geometrically smoothed by means of arcs and splines within the NC system. In this study, a continuous feed motion is generated by directly planning jerk limited velocity transitions for the drives in the vicinity of sharp corners of the tool-path. This approach completely eliminates the need for geometry based path smoothing and feed planning. Contouring errors at sharp corners are controlled analytically by accurately calculating cornering speed and duration. Since proposed approach bases on kinematically planning axis motion profiles, it exploits acceleration and jerk limits of the drives and delivers a near-time optimal motion. Experimental validation and comparisons are presented to show significant improvement in the cycle time and accuracy of contouring Cartesian tool-paths.

      PubDate: 2016-06-16T18:04:30Z
      DOI: 10.1016/j.ijmachtools.2016.05.009
      Issue No: Vol. 108 (2016)
       
  • Investigation on the position drift of the axis average line of the
           aerostatic bearing spindle in ultra-precision diamond turning
    • Authors: P. Huang; W.B. Lee; C.Y. Chan
      Pages: 44 - 51
      Abstract: Publication date: Available online 12 May 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): P. Huang, W.B. Lee, C.Y. Chan
      To evaluate the performance of the spindle, many techniques have been proposed to measure the spindle error motion. However, few studies have focused on the investigation of the position drift of the axis average line (AAL). In the present study, the AAL of the aerostatic bearing spindle is investigated both theoretically and experimentally. An error model is developed to analyze the errors which contribute to the error of depth of cut in slow tool servo assisted turning. Moreover, an experiment of microstructure fabrication is conducted to investigate the amplitude error of microstructures along both axial and radial direction of the cylindrical workpiece. The effects of spindle error motion, spindle unbalance induced eccentricity, thermal error and position drift of AAL are analyzed. The results indicates that the position drift of AAL varies significantly in terms of the variation of the spindle speed due to the hydrodynamic effect, and the relation between the drift and the spindle speed is nonlinear.

      PubDate: 2016-05-13T16:40:14Z
      DOI: 10.1016/j.ijmachtools.2016.05.001
      Issue No: Vol. 108 (2016)
       
  • Experimental studies and CFD simulation of the internal cooling conditions
           when drilling Inconel 718
    • Authors: Ekrem Oezkaya; Nicolas Beer; Dirk Biermann
      Pages: 52 - 65
      Abstract: Publication date: Available online 8 June 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Ekrem Oezkaya, Nicolas Beer, Dirk Biermann
      When drilling the superalloy Inconel 718 twist drills are faced with high thermomechanical loads. Owing to the low thermal conductivity of the workpiece material a large amount of the generated heat has to be transported away from the tool by the coolant. In this paper, the influence of the coolant pressure and the diameter of the coolant channels have been studied. The experiments have been supported by using computational fluid dynamics (CFD) simulations and were focused on the tool wear and the bore quality. The CFD simulation is a valuable tool which supported the present investigation, that a higher mass flux has no advantage regarding tool life and bore quality; moreover, the modification of the channel diameters has not reduced the thermal loads. In all investigated processes, dead zones near the cutting edge and the counter edge could not be reduced by increasing the flow rate. Only by the use of higher coolant pressures, the tool life could be significantly increased, as well as the bore quality. The investigations prove that especially when metrological methods reach their limits, the CFD is a suitable tool; which supports the design process effectively by giving a better insight into the coolant flow resulting from the complex drilling processes.

      PubDate: 2016-06-16T18:04:30Z
      DOI: 10.1016/j.ijmachtools.2016.06.003
      Issue No: Vol. 108 (2016)
       
  • A Computational Fluid Dynamics (CFD) Model for Effective Coolant
           Application in Deep Hole Gundrilling
    • Authors: K.S. Woon; G.L. Tnay; M. Rahman; S. Wan; S.H. Yeo
      Abstract: Publication date: Available online 25 November 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): K.S. Woon, G.L. Tnay, M. Rahman, S. Wan, S.H. Yeo
      Effective coolant application in deep hole gundrilling is crucial to prevent rapid degradation and failure of drills through high performance cooling, lubrication and chip evacuation. This paper presents a novel methodology to increase effectiveness of coolant application through strategic optimization of gun drill designs that leads to appreciable tool life improvement, based on computational fluid dynamics (CFD) analysis. Through the analyses of coolant flow characteristics and rheological properties, conventional designs of critical drill geometries like nose grind contour, coolant hole configuration and shoulder dub-off angle, which are detrimental to coolant application and hence tool life are determined. A new, optimized gun drill design for the drilling of deep holes on Ni-based alloys is proposed. All findings are experimentally substantiated.

      PubDate: 2016-11-29T02:02:03Z
      DOI: 10.1016/j.ijmachtools.2016.11.008
       
  • Variation of surface generation mechanisms in ultra-precision machining
           due to relative tool sharpness (RTS) and material properties
    • Authors: M. Azizur Rahman; M. Raihan Amrun; Mustafizur Rahman; A. Senthil Kumar
      Abstract: Publication date: Available online 23 November 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): M. Azizur Rahman, M. Raihan Amrun, Mustafizur Rahman, A. Senthil Kumar
      The need for ultra-fine surface generation by machining in micrometer and sub-micrometer scales is increasing rapidly for fabrication of micro products. However, there are limitations of bringing down the process from macro to micro to ultra-precision level due to the variation of the physical phenomenon responsible for surface generation process which is significantly dependent on tool edge radius. To analyze the tool edge radius effect, the governing process parameter identified as the ratio of undeformed chip thickness (a) to tool edge radius (r), which is known as relative tool sharpness, RTS (a/r). However, there are lacking of mathematical models to quantify the micro-mechanics of the material deformation during the surface generation process. In this study, a mathematical model has been established for the material removal mechanism with relation to edge radius effect. The novelty of this model lies in its ability to quantify the instantaneous material flow angle (φ ne ) for a particular tool-workpiece combination with relative tool sharpness (RTS). The proposed model is able to capture the trend of the change of surface generation mechanism from shearing to extrusion to ploughing and rubbing. The transition of the deformation behaviour is predicted form the mathematical model and orthogonal cutting experiments were conducted for the validation of the results for two materials (Mg and Cu alloy). Under identical machining conditions, micro-chips and machined surface integrity of Cu and Mg alloy exhibited different characteristics. For the best nanometric finishing, the ‘extrusion-like’ machining zone is identified where the RTS value for Cu alloy is found smaller than that for Mg alloy. Hence, smaller grain material (Cu alloy, ~35µm) provides smaller RTS value than larger grain material (Mg alloy, ~126µm) for achieving superior surface finishing. Therefore, material properties play an important role for the relative tool sharpness (RTS) during the variation of high quality surface generation mechanism.

      PubDate: 2016-11-29T02:02:03Z
      DOI: 10.1016/j.ijmachtools.2016.11.003
       
  • Upgraded stability analysis of milling operations by means of advanced
           modeling of tooling system bending
    • Authors: Totis Albertelli; Torta Sortino Monno
      Abstract: Publication date: Available online 25 November 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): G. Totis, P. Albertelli, M. Torta, M. Sortino, M. Monno
      The problem of undesired self-excited chatter vibrations in milling is very common. However, only in the last two decades some significant achievements for the theoretical understanding of this intricate phenomenon have been accomplished. Nevertheless, state of the art dynamic models are still not able to completely explain milling dynamics and chatter onset during some conventional milling operations performed by conventional cutting tools. In this research work, a revolutionary model of tooling system dynamics and of the regenerative effect in milling will be presented. The new model introduces a significant correction to the predicted stability borders when the cutter diameter is relatively large in comparison with tooling system overhang and when curved or inclined cutting edges are applied. Accordingly, the new approach may be of great interest for many industrial applications. The model has been successfully validated by performing experimental modal analysis, cutting force coefficient identification and stability lobes diagram determination, through many specific cutting tests. In the considered case study, where the afore mentioned geometrical features of the tooling system were still moderate, a significant shift of the stability borders of about +25% was experimentally observed and correctly predicted by the new approach.
      Graphical abstract image Highlights

      PubDate: 2016-11-29T02:02:03Z
       
  • Robustness Modeling Method for Thermal Error of CNC Machine Tools Based on
           Ridge Regression Algorithm
    • Authors: Hui Liu; Ming Miao Xin Yuan Wei Xin Dong Zhuang
      Abstract: Publication date: Available online 23 November 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Hui Liu, En Ming Miao, Xin Yuan Wei, Xin Dong Zhuang
      For thermal error compensation technology of CNC machine tools, the collinearity between temperature sensitive points is the main factor for determining the predicted robustness of thermal error model. The temperature sensitive points are input variables of the thermal error model. This paper studies the thermal error of Leaderway V-450 type CNC machine tools during different seasons. It is found that although the commonly used temperature sensitive point selection methods can significantly reduce the collinearity between temperature sensitive points, the correlation between some of the selected temperature-sensitive points and thermal error is weak. This causes the temperature-sensitive points to be variable and the predicted accuracy and robustness of thermal error to be reduced. Therefore, in this paper, the temperature sensitive points are selected directly by their correlation with thermal error to eliminate variability. However, the experimental results also show that the collinearity between temperature sensitive points is very large. Hence, the ridge regression algorithm is used to establish a thermal error model to inhibit the bad influence of collinearity on the thermal error predicted robustness. Thus, the “robustness ridge regression machine tool thermal error modeling method” is proposed, the “RRR method” for short. In addition, in the “RRR method”, the correlation coefficient is used to measure the correlation between temperature sensitive points and thermal error instead of the commonly used gray correlation; because this paper finds that the gray correlation algorithm is essentially inapplicable for measuring a negative correlation. Based on the thermal error experiment data for the whole year, the “RRR method” is compared with two currently used methods, and the results show that the “RRR method” can significantly enhance the long-term predicted accuracy and robustness of thermal error. Finally, the application effect of practical compensation shows that the “RRR method” is usable and effective.

      PubDate: 2016-11-29T02:02:03Z
       
  • Polishing-pad-free electrochemical mechanical polishing of
           single-crystalline SiC surfaces using polyurethane–CeO2 core–shell
           particles
    • Authors: Junji Murata; Koushi Yodogawa; Kazuma Ban
      Abstract: Publication date: Available online 26 November 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Junji Murata, Koushi Yodogawa, Kazuma Ban
      A novel method for electrochemical mechanical polishing (ECMP) of the single-crystalline SiC surface, which has extremely high mechanical and chemical strength compared to conventional electronic materials, is reported. The method does not employ a polishing pad; it comprises electrochemical oxidization of the SiC surface and subsequent removal of the oxide by CeO2 from the polyurethane–CeO2 core–shell particles. The core–shell particles are used to maintain a gap between the polishing plate (cathode) and the SiC wafer (anode), which enables efficient anodic oxidation of the inert SiC surface. The core–shell particles, composed of the elastic polyurethane core covered with an abrasive layer of small and soft CeO2 particles prepared by a simple and low-cost process, can be used to obtain a smooth SiC surface without using a polishing pad. The ratio of polyurethane to CeO2 in the core–shell particles is optimized to obtain core particles that are fully covered with the shell particles without leaving excess CeO2 particles. Using the fabricated core–shell particles, the conventional CMP process is unable to remove the SiC surface without anodization. While a continuous bias during polishing produces a rough SiC surface owing to the oxide film remaining on the treated surface, as confirmed by current measurements and X-ray analysis, a periodically applied bias, whose conditions were determined by the theoretical growth rate and residual thickness of the oxide film, reduces the number of scratches, and a smooth surface with sub-nanometer roughness is obtained. The obtained value of surface roughness is in good agreement with the calculated value determined using conventional grinding theory. Compared to a conventional polishing process with a colloidal SiO2 slurry, the proposed method shows superior polishing efficiency without the need for a polishing pad. SEM observation of the core–shell particles shows that the particles have durability against the strong electric field between the electrodes.

      PubDate: 2016-11-29T02:02:03Z
      DOI: 10.1016/j.ijmachtools.2016.11.007
       
  • Damage-free finishing of CVD-SiC by a combination of dry plasma etching
           and plasma-assisted polishing
    • Authors: Hui Deng; Katsuyoshi Endo; Kazuya Yamamura
      Abstract: Publication date: Available online 26 November 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Hui Deng, Katsuyoshi Endo, Kazuya Yamamura
      To realize the damage-free finishing of CVD-SiC substrates, which are used as materials for space telescope mirrors and glass lens molds, plasma chemical vaporization machining (PCVM) and plasma-assisted polishing (PAP) were combined. In this study, the properties of such CVD-SiC substrates, including their surface morphology, composition and crystalline orientation, were investigated. Lapping using diamond abrasives and conventional chemical mechanical polishing (CMP) using CeO2 slurry were conducted for comparison with the proposed atmospheric-pressure-plasma-based finishing process. Many scratches and a subsurface damage (SSD) layer were formed by the diamond lapping of CVD-SiC. Conventional CMP using CeO2 slurry was conducted for the damage-free finishing of CVD-SiC. However, the polishing efficiency was very low. In the proposed process, PCVM, which is a noncontact dry etching process, was performed to remove the SSD layer while PAP, which combines plasma modification and soft abrasive polishing, was performed for damage-free surface finishing. PCVM was conducted on a diamond-lapped CVD-SiC surface. After PCVM for a short duration of 5min, the scratches and SSD layer formed by lapping were completely removed, although the surface roughness was slightly increased. PAP using a resin-bonded CeO2 grindstone was conducted to decrease the surface roughness of CVD-SiC processed by diamond lapping and PCVM for 5min, for which a loose-held-type grindstone was demonstrated to be very useful. A flat and scratch-free surface with an rms roughness of 0.6nm was obtained after PAP finishing.

      PubDate: 2016-11-29T02:02:03Z
      DOI: 10.1016/j.ijmachtools.2016.11.002
       
  • Ductile machining of single-crystal silicon for microlens arrays by
           ultraprecision diamond turning using a slow tool servo
    • Authors: Mao Mukaida; Jiwang Yan
      Abstract: Publication date: Available online 27 November 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Mao Mukaida, Jiwang Yan
      Microlens arrays of single-crystal silicon are required increasingly in advanced IR optics. In this study, we attempted to machine spherical concave microlens arrays on a single-crystal silicon wafer by slow tool servo diamond turning. The form error, surface topography, material phase transformation, and cutting force characteristics were investigated experimentally. It was found that brittle fracture occurred preferentially at one side (the exit side of tool feed) of the lens dimples when cutting direction is along <110> and tool feed rate is high. Amorphous silicon phase was generated significantly at one side (the exit side of tool feed) of the dimples as tool feed rate increased. The peak values and the direction angles of cutting forces changed with tool feed rate, crystal orientation, and the cutting direction. Two kinds of tool wear, namely, micro chippings and flank wear were observed in different regions of the tool edge where undeformed chip thickness is different. Spherical microlens arrays with a form error of ~300 nmPV and surface roughness of ~6 nmSa were successfully fabricated.
      Graphical abstract image

      PubDate: 2016-11-29T02:02:03Z
      DOI: 10.1016/j.ijmachtools.2016.11.004
       
  • IFC - Editorial board
    • Abstract: Publication date: January 2017
      Source:International Journal of Machine Tools and Manufacture, Volume 112


      PubDate: 2016-11-29T02:02:03Z
       
  • Study on ductile mode machining of single crystal silicon by mechanical
           machining
    • Authors: Dae-Hee Choi; Je-Ryung Lee; Na-Ri Kang; Tae-Jin Je; Ju-Young Kim; Eun-chae Jeon
      Abstract: Publication date: Available online 1 November 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Dae-Hee Choi, Je-Ryung Lee, Na-Ri Kang, Tae-Jin Je, Ju-Young Kim, Eun-chae Jeon
      Nano patterns on single crystal silicon are generally manufactured by photolithography, which can form limited cross-sectional shapes such as U-shapes or rectangular channels. Though V-shaped patterns are widely used in the optical industries because they concentrate light, they are challenging to manufacture by conventional photolithography. Mechanical machining is useful in manufacturing various kinds of cross-sectional shapes including V-shapes with various apex angles, but is hard to apply to single-crystal silicon due to its brittle fracture. Here we suggest a novel way of mechanical machining of single-crystal silicon that suppresses brittle fracture below the critical point (the ductile-brittle transition point) as determined by nano scratch testing. We find that the first drop point of the cutting force corresponds to a critical point and define the critical forces as the thrust force and the cutting force at the critical point. The critical forces are varied by the applied force per unit length, which is the possibility that the cutting tool interacts with mechanically weak atomic bonds. When the applied force per unit length is zero (a general condition of mechanical machining), the cutting speed does not affect the variation of the critical forces or the quality of the machined pattern. Based on analysis of the experimental results, we suggest that the single-crystal silicon can be mechanically machined without brittle fracture at high cutting speed if the thrust force is smaller than the critical force of zero applied force per unit length.

      PubDate: 2016-11-02T07:48:31Z
      DOI: 10.1016/j.ijmachtools.2016.10.006
       
  • IFC - Editorial board
    • Abstract: Publication date: December 2016
      Source:International Journal of Machine Tools and Manufacture, Volume 111


      PubDate: 2016-11-02T07:48:31Z
       
  • The concept and progress of intelligent spindles: A review
    • Authors: Hongrui Cao; Xingwu Zhang; Xuefeng Chen
      Abstract: Publication date: Available online 17 October 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Hongrui Cao, Xingwu Zhang, Xuefeng Chen
      Intelligent spindles are core components of the next-generation of intelligent/smart machine tools in the Industry 4.0 Era. The purpose of this paper is to clarify the concept of intelligent spindles and provide an in-depth review of the state-of-the-art of related technologies. A new integrated concept for intelligent spindles is proposed, followed by descriptions of required characteristics, key enabling technologies and expected intelligent functions. Relevant research that may be beneficial to the development of intelligent spindles is reviewed from six thrust areas, which include monitoring and control of tool condition, chatter, spindle collision, temperature/thermal error, spindle balance, and spindle health. Finally, current limitations and challenges are discussed, and future trends of intelligent spindles are prospected from various perspectives.
      Graphical abstract image

      PubDate: 2016-10-21T18:13:01Z
      DOI: 10.1016/j.ijmachtools.2016.10.005
       
  • Corrigendum to “Chip fractal geometry and loading characteristics of
           sinusoidal multi-cutters in hack-sawing process” [Int. J. Machine
           Tools Manuf. (2012) 65–80]
    • Authors: Sung-Hua Wu; J.-J. Junz Wang; Rong-Shean Lee
      Abstract: Publication date: Available online 30 September 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Sung-Hua Wu, J.-J. Junz Wang, Rong-Shean Lee


      PubDate: 2016-10-08T14:18:23Z
      DOI: 10.1016/j.ijmachtools.2016.09.007
       
  • Straightness error modeling and compensation for gantry type open
           hydrostatic guideways in grinding machine
    • Authors: Jun Zha; Fei Xue; Yaolong Chen
      Abstract: Publication date: Available online 6 October 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Jun Zha, Fei Xue, Yaolong Chen
      This study presents an approach to model and compensate the vertical straightness error of gantry type open hydrostatic guideways. The straightness error is measured at different measurement points on the beam using a laser interferometer. To investigate different trends in the straightness error, a static analysis model is established, based on the error averaging effect considering the guiderail profile error. The linear deviation of the slider is computed and the vertical straightness error is calculated using a least-square method. The simulation results indicate that the measurement points have a big impact on the straightness error. The minimum value appeared when measurement point located at the middle of the X beam. And more closer to Y guide rails, higher value will be. The positions of the measurement points are chosen according to the change trend of the vertical straightness error. Finally, vertical straightness error is compensated and the compensation results are compared between different coordinate values. Experimental results show that the straightness error model and error compensation strategy help to effectively improve the accuracy of gantry type open hydrostatic guideways in grinding machines.

      PubDate: 2016-10-08T14:18:23Z
      DOI: 10.1016/j.ijmachtools.2016.10.002
       
  • Grinding forces in micro slot-grinding (MSG) of single crystal sapphire
    • Authors: J. Cheng; J. Wu; Y.D. Gong; X.L. Wen; Q. Wen
      Abstract: Publication date: Available online 6 October 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): J. Cheng, J. Wu, Y.D. Gong, X.L. Wen, Q. Wen
      Micro-slot grinding (MSG) is an important processing method for the micro-machining of hard brittle crystalline materials. Modelling the MSG of crystal material is necessary to understand its precision micro-machining aspects. In this paper, a predictive model is developed for the grinding force in MSG in three different orientations of single crystal sapphire: the C-orientation {0001}, A-orientation {11 2 ( _ ) 0} and R-orientation {1 1 ( _ ) 02} are established. The crystalline effects of the density of Al+, -Al+ and D Al +; the density of O- hollows D O -; the number of crystal layers ζ; and the weak shape of different orientations are incorporated. Three group experiments (144 paths) are performed, and the differences in the grinding forces from three orientations, {0001}, {11 2 ( _ ) 0} and {1 1 ( _ ) 02}, are discussed. The grinding forces of the A-orientation {11 2 ( _ ) 0} are higher than of the other two orientations {0001} and {110 2 ( _ ) }, and the number of crystal layers ζ is shown to play a vital role in determining the grinding force required for MSG of sapphire. The force ratio r F (F x/F y) is between 0.6 to 0.8, and the r F of {110 2 ( _ ) } is more stable than for the {11 2 ( _ ) 0} and {0001} orientations. A comparison with existing models and experimental data shows that the model used in this study fits the experimental data better, especially at lower feeding rates.

      PubDate: 2016-10-08T14:18:23Z
      DOI: 10.1016/j.ijmachtools.2016.10.004
       
  • Analytical Modeling for Thermal Errors of Motorized Spindle Unit
    • Authors: Teng Liu; Weiguo Gao; Dawei Zhang; Yifan Zhang; Wenfen Chang; Cunman Liang; Yanling Tian
      Abstract: Publication date: Available online 23 September 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Teng Liu, Weiguo Gao, Dawei Zhang, Yifan Zhang, Wenfen Chang, Cunman Liang, Yanling Tian
      Modeling method investigation about spindle thermal errors is significant for spindle thermal optimization in design phase. To accurately analyze the thermal errors of motorized spindle unit, this paper assumes approximately that 1) spindle linear thermal error on axial direction is ascribed to shaft thermal elongation for its heat transfer from bearings, and 2) spindle linear thermal errors on radial directions and angular thermal errors are attributed to thermal variations of bearing relative ring displacements. Based on prerequisites, an analytical modeling method is developed to analyze these spindle thermal errors. Firstly, thermal-mechanical models of rotating ring geometry and interference assembled rotating ring geometries are established, for thermal variation modeling of relative ring displacements of short cylindrical roller bearing and angular contact ball bearing. Secondly, these thermal variation models are associated with heat-fluid-solid coupling FE (finite element) simulation technique, to model spindle linear thermal errors on radial /axial directions and angular thermal errors by the analytical simulation method. Consequently, verification experiments clarify that the presented method is accurate for spindle thermal errors modeling, and can be effectively applied into the design and development phases of motorized spindle units.

      PubDate: 2016-09-24T08:04:24Z
      DOI: 10.1016/j.ijmachtools.2016.09.008
       
  • IFC - Editorial board
    • Abstract: Publication date: November 2016
      Source:International Journal of Machine Tools and Manufacture, Volume 110


      PubDate: 2016-09-24T08:04:24Z
       
  • Research on the dynamics of ball screw feed system with high acceleration
    • Authors: Jun Zhang.; Huijie Zhang Chao Wanhua Zhao
      Abstract: Publication date: Available online 6 September 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Jun Zhang., Huijie Zhang, Chao Du, Wanhua Zhao
      For the ball screw feed system with high acceleration, the large inertial force derived from the moving components may change the real contact state of the system kinematic joints, resulting in the changes of the contact stiffness and hence the dynamic characteristics of the feed system. In this study, an equivalent dynamic model of the ball screw feed system is established using lumped parameter method considering the influence of the acceleration. Equivalent axial stiffnesses of screw-nut joints and bearing joints are both derived based on the contact state due to the variation of inertial force. The experiments on the ball screw feed system driven with different accelerations are also performed to verify the dynamic model proposed. The variation of the contact stiffness of the kinematic joints, transmission stiffness and natural frequency of the feed system are discussed with acceleration and the results show that they all reveal sudden changes when acceleration reaches a certain value. Total load, rated dynamic load and screw tension force have a great effect on the system natural frequency at different accelerations. The largest acceleration the feed system can reach is determined by the smaller one of the two critical accelerations for nut joints and bearing joints.

      PubDate: 2016-09-07T18:45:00Z
       
  • IFC - Editorial board
    • Abstract: Publication date: October 2016
      Source:International Journal of Machine Tools and Manufacture, Volume 109


      PubDate: 2016-08-27T11:42:21Z
       
  • Influenceof hatch spacing on heat and mass transfer, thermodynamics and
           laser processability during additive manufacturing of Inconel 718 alloy
    • Authors: Mujian Xia; Dongdong Guanqun Donghua Dai Hongyu Chen Qimin Shi
      Abstract: Publication date: Available online 27 July 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Mujian Xia, Dongdong Gu, Guanqun Yu, Donghua Dai, Hongyu Chen, Qimin Shi
      Atransient three-dimensional powder-scale model has been established for investigating the thermodynamics, heat and mass transfer and surface quality within the molten pool during selective laser melting (SLM) Inconel 718 alloy by finite volume method (FVM), considering the powder-solid transition, variation of thermo-physical properties, and surface tension. The influences of hatch spacing (H) on the thermodynamics, heat and mass transfer, and resultant surface quality of molten pool have been discussed in detail. The results revealed that the H had a significant influence on determining the terminally solidified surface quality of the SLM-processed components. As a relative lower H of 40μm was used, a considerable amount of molten liquid migrated towards the previous as-fabricated tracks with a higher velocity, resulting in a stacking of molten liquid and the attendant formation of a poor surface quality with a large average surface roughness of 12.72μm. As an appropriate H of 60μm was settled, a reasonable temperature gradient and the resultant surface tension tended to spread the molten liquid with a steady velocity, favoring the formation of a flat surface of the component and an attendant low average surface roughness of 2.23μm. Both the surface morphologies and average surface roughness were experimentally obtained, which were in a full accordance with the results calculated by simulation.

      PubDate: 2016-07-29T19:41:48Z
       
  • Studyon a 5-axis precision and mirror grinding of glass freeform surface
           without on-machine wheel-profile truing
    • Authors: Xie Deng; Liao Zhou Ban
      Abstract: Publication date: Available online 27 July 2016
      Source:International Journal of Machine Tools and Manufacture
      Author(s): J Xie, Z J Deng, J Y Liao, N Li, H Zhou, W X Ban
      Theprecision freeform grinding depends on the on-machine truing of diamond wheel, leading to the inefficiency of grinding system. Hence, a virtual ball-end algorithm along with a fixed tool posture angle is proposed for the 5-axis grinding of glass by using a self-dressing diamond wheel. The objective is to realize the precision and mirror freeform grinding without any wheel-profile truing. First, virtual ball-end grinding, ground freeform surface and freeform errors compensation were modeled in 5-axis grinding system, respectively; then tool interference, envelope trace height, grain cutting depth and ground surface roughness were systemically investigated in connection with tool posture angle, tool sizes, grain protrusion variables, abrasive parameters and self-dressing coefficient; finally, the 5-axis grinding experiments of F-theta freeform glass lens were performed. It is shown that the virtual ball-end algorithm is valid for the 5-axis freeform grinding with a self-dressing abrasive tool. Increasing tool posture angle decreases the grain cutting depth to the critical cutting depth from brittle cutting to ductile cutting, but it increases the risk of tool interference. The mirror freeform grinding may be parameterized by material behavior, tool size and posture, grinding conditions and abrasive tool performance. On the base of virtual ball-end algorithm, the form errors compensation enhances the mirror-ground freeform accuracy by 26%. It is confirmed that the 3-μm-size diamond grinding without on-machine truing is feasible to fabricate the precision and mirror freeform glass along with the tool posture angle of 30°.
      Graphical abstract image

      PubDate: 2016-07-29T19:41:48Z
       
  • IFC - Editorial board
    • Abstract: Publication date: September 2016
      Source:International Journal of Machine Tools and Manufacture, Volume 108


      PubDate: 2016-07-25T11:48:25Z
       
 
 
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