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  Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 263 journals)
    - CERAMICS, GLASS AND POTTERY (25 journals)
    - MACHINERY (33 journals)
    - MANUFACTURING AND TECHNOLOGY (159 journals)
    - METROLOGY AND STANDARDIZATION (3 journals)
    - PACKAGING (13 journals)
    - PAINTS AND PROTECTIVE COATINGS (5 journals)
    - PLASTICS (25 journals)

MACHINERY (33 journals)

Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9)
Advanced Energy Materials     Hybrid Journal   (Followers: 16)
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  
Electric Power Components and Systems     Hybrid Journal   (Followers: 6)
Engenharia AgrĂ­cola     Open Access  
Foundations and Trends® in Electronic Design Automation     Full-text available via subscription  
High Temperature Materials and Processes     Full-text available via subscription   (Followers: 4)
International Journal of Machine Tools and Manufacture     Hybrid Journal   (Followers: 4)
International Journal of Machining and Machinability of Materials     Hybrid Journal   (Followers: 5)
International Journal of Manufacturing Technology and Management     Hybrid Journal   (Followers: 7)
International Journal of Precision Technology     Hybrid Journal  
International Journal of Rapid Manufacturing     Hybrid Journal   (Followers: 1)
International Journal of Rotating Machinery     Open Access   (Followers: 1)
ISRN Mechanical Engineering     Open Access   (Followers: 5)
Journal of Machinery Manufacture and Reliability     Hybrid Journal  
Journal of Machinery Manufacturing and Automation     Open Access   (Followers: 1)
Journal of Mechanics     Hybrid Journal   (Followers: 16)
Journal of Strain Analysis for Engineering Design     Hybrid Journal   (Followers: 5)
Journal of Terramechanics     Hybrid Journal   (Followers: 1)
Machine Design     Partially Free   (Followers: 10)
Machines     Open Access  
Materials     Open Access   (Followers: 5)
Mechanics Based Design of Structures and Machines: An International Journal     Hybrid Journal   (Followers: 2)
Micromachines     Open Access   (Followers: 1)
Practical Machinery Management for Process Plants     Full-text available via subscription  
Pump Industry Analyst     Full-text available via subscription  
Russian Engineering Research     Hybrid Journal  
Sensor Review     Hybrid Journal   (Followers: 1)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 5)
Journal Cover International Journal of Machine Tools and Manufacture
   [6 followers]  Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 0890-6955
     Published by Elsevier Homepage  [2575 journals]   [SJR: 2.724]   [H-I: 71]
  • Distortion minimization of disks for gear manufacture
    • Abstract: Publication date: April 2011
      Source:International Journal of Machine Tools and Manufacture, Volume 51, Issue 4
      Author(s): Ekkard Brinksmeier , Thomas Lübben , Udo Fritsching , Chengsong Cui , Rüdiger Rentsch , Jens Sölter
      In order to minimize shape deviations in hardening of gear wheels, all production steps in the manufacture of disks made of SAE 5120 prior to heat-treatment were analyzed by means of design of experiments (DoE). The influence of hardenability, pre-heat treatment, forging temperature, and feed rate and partition of material removal in cutting on the distortion of disks were investigated. Standard case hardening of the disks led to a characteristic shape change called “dishing”. The statistical analysis of the test results has proven that dishing of disks is mainly affected by the partition of the material removal in the considered case. In additional experiments dishing could be eliminated (on average) by an optimized partition of the material removal. However, results from experiments with spray-formed disks and with disks using a different forming strategy imply that the material flow combined with material inhomogeneities are the physical causes for dishing rather than the partition of material removal.
      Highlights ► Case hardened disks show a dishing behavior which seems to depend on the local shape of the banded structure. ► It is assumed that an interaction between casting, hot forming and cutting exists and that it is responsible for dishing. ► Dishing can be minimized by an adapted material removal partition. ► A combination of a symmetrical mass flow during forming and a symmetrical material removal during machining avoids dishing. ► When using spray-formed material dishing is negligible.

      PubDate: 2014-12-15T18:23:05Z
       
  • Chatter modelling in micro-milling by considering process nonlinearities
    • Abstract: Publication date: May 2012
      Source:International Journal of Machine Tools and Manufacture, Volume 56
      Author(s): S.M. Afazov , S.M. Ratchev , J. Segal , A.A. Popov
      This paper presents a new approach for chatter modelling in micro-milling. The model takes into account: the nonlinearity of the uncut chip thickness including the run-out effect; velocity dependent micro-milling cutting forces; the dynamics of the tool-holder-spindle assembly. The uncut chip thickness is determined after considering the full kinematics of the cutting tool including the run-out effect. The micro-milling cutting forces are determined by: (i) a finite element (FE) prediction of the cutting forces in orthogonal cutting at different cutting velocities and uncut chip thicknesses; (ii) describing the relationship between cutting forces, cutting velocities and uncut chip thicknesses into a nonlinear equation; (iii) incorporating the uncut chip thickness model into the relationship of the cutting forces as function of the cutting velocity and the uncut chip thickness. The modal dynamic parameters at the cutting tool tip are determined for the tool-holder-spindle assembly and used for solving the equation of motion. The micro-milling process is modelled as two degrees of freedom system where the modal dynamic parameters for the tool-holder-spindle assembly and the micro-milling cutting forces are considered. Due to nonlinearities in the micro-milling cutting forces, the equation of motion is integrated numerically in the time domain using the Runge–Kutta fourth order method. The displacements in the x and y directions are obtained for one revolution-per-tool. Statistical variances are then employed as a chatter detection criterion in the time-domain solution. Scanning electron microscope (SEM) inspection is carried out to observe potential chatter marks on the micro-milled AISI 4340 steel surfaces at different spindle speeds and depths of cut. The predicted stability lobes and the experimentally obtained stability limits resulted in satisfactory agreement. The influence of the run-out effect on the stability lobes at different feed rates was investigated, which demonstrated the capability of the developed chatter model to consider quantitatively the run-out phenomenon. The results showed that the stability limits decrease by increasing the run-out length.
      Highlights ► A new micro-milling chatter model in the time domain solution is developed and validated. ► An experimental methodology is developed to inspect the surface finish for chatter marks. ► The effect of the cutting tool dynamics and run-out on the process stability is investigated.

      PubDate: 2014-12-15T18:23:05Z
       
  • Two efficient iterative algorithms for error prediction in peripheral
           milling of thin-walled workpieces considering the in-cutting chip
    • Abstract: Publication date: October 2013
      Source:International Journal of Machine Tools and Manufacture, Volume 73
      Author(s): Yong-Gang Kang , Zhong-Qi Wang
      Due to the deflection of tool and workpiece induced by cutting force, there is a high complexity associated with the prediction of surface form errors in peripheral milling of thin-walled workpieces. Based on the systematic study of in-cutting chip, this paper proposes a new efficient iterative algorithm named flexible iterative algorithm (FIAL), which is suitable for surface form errors prediction in peripheral milling of low rigid thin-walled workpiece. In FIAL, an iterative scheme for calculations of tool/workpiece (TW) deflections are developed by considering the former convergence cutting position, and in the scheme a new important variable Δ is proposed for the calculation of radial cutting depth which never been considered before. Based on FIAL and the analytical study of in-cutting chip, a double iterative algorithm (DIAL) is brought forwarded to calculate the positions and magnitude of the maximum surface form errors, which always take the peak point include in each iterative step. Comparisons of the form errors and cutting forces obtained numerically and experimentally confirm the validity of the proposed algorithms and simulation procedure. The experimental and analytical results have shown that FIAL is faster in the iteration convergent speed and more accurate than the rigid iterative algorithm in surface form errors prediction, and DIAL is proved to be valid in the maximum errors prediction.


      PubDate: 2014-12-15T18:23:05Z
       
  • Mechanism investigation of friction-related effects in single point
           incremental forming using a developed oblique roller-ball tool
    • Abstract: Publication date: October 2014
      Source:International Journal of Machine Tools and Manufacture, Volume 85
      Author(s): B. Lu , Y. Fang , D.K. Xu , J. Chen , H. Ou , N.H. Moser , J. Cao
      Single point incremental forming (SPIF) is a highly versatile and flexible process for rapid manufacturing of complex sheet metal parts. In the SPIF process, a ball nose tool moves along a predefined tool path to form the sheet to desired shapes. Due to its unique ability in local deformation of sheet metal, the friction condition between the tool and sheet plays a significant role in material deformation. The effects of friction on surface finish, forming load, material deformation and formability are studied using a newly developed oblique roller ball (ORB) tool. Four grades of aluminum sheet including AA1100, AA2024, AA5052 and AA6111 are employed in the experiments. The material deformation under both the ORB tool and conventional rigid tool are studied by drilling a small hole in the sheet. The experimental results suggest that by reducing the friction resistance using the ORB tool, better surface quality, reduced forming load, smaller through-the-thickness-shear and higher formability can be achieved. To obtain a better understanding of the frictional effect, an analytical model is developed based on the analysis of the stress state in the SPIF deformation zone. Using the developed model, an explicit relationship between the stress state and forming parameters is established. The experimental observations are in good agreement with the developed model. The model can also be used to explain two contrary effects of friction and corresponding through-the-thickness-shear: increase of friction would potentially enhance the forming stability and suppress the necking; however, increase of friction would also increase the stress triaxiality and decrease the formability. The final role of the friction effect depends on the significance of each effect in SPIF process.


      PubDate: 2014-12-15T18:23:05Z
       
  • Numerical study of the solution heat treatment, forming, and in-die
           quenching (HFQ) process on AA5754
    • Abstract: Publication date: December 2014
      Source:International Journal of Machine Tools and Manufacture, Volume 87
      Author(s): Omer El Fakir , Liliang Wang , Daniel Balint , John P. Dear , Jianguo Lin , Trevor A. Dean
      An FE model of the solution heat treatment, forming and in-die quenching (HFQ) process was developed. Good correlation with a deviation of less than 5% was achieved between the thickness distribution of the simulated and experimentally formed parts, verifying the model. Subsequently, the model was able to provide a more detailed understanding of the HFQ process, and was used to study the effects of forming temperature and speed on the thickness distribution of the HFQ formed part. It was found that a higher forming speed is beneficial for HFQ forming, as it led to less thinning and improved thickness homogeneity.


      PubDate: 2014-12-15T18:23:05Z
       
  • A Method of Testing Position Independent Geometric Errors in Rotary Axes
           of a Five-axis Machine Tool Using a Double Ball Bar
    • Abstract: Publication date: Available online 5 November 2014
      Source:International Journal of Machine Tools and Manufacture
      Author(s): Xiaogeng Jiang , Robert J. Cripps
      Ensuring that a five-axis machine tool is operating within tolerance is critical. However, there are few simple and fast methods to identify whether the machine is in a “usable” condition. This paper investigates the use of the double ball bar (DBB) to identify and characterise the position independent geometric errors (PIGEs) in rotary axes of a five-axis machine tool by establishing new testing paths. The proposed method consists of four tests for two rotary axes; the A-axis tests with and without an extension bar and the C-axis tests with and without an extension bar. For the tests without an extension bar, position errors embedded in the A- and C-axes are measured first. Then these position errors can be used in the tests with an extension bar, to obtain the orientation errors in the A- and C-axes based on the given geometric model. All tests are performed with only one axis moving, thus simplifying the error analysis. The proposed method is implemented on a Hermle C600U five-axis machine tool to validate the approach. The results of the DBB tests show that the new method is a good approach to obtaining the geometric errors in rotary axes, thus can be applied to practical use in assembling processes, maintenance and regular checking of multi-axis CNC machine tools.


      PubDate: 2014-11-24T10:00:40Z
       
  • A study of an improved cutting mechanism of composite materials using
           novel design of diamond micro-core drills
    • Abstract: Publication date: January 2015
      Source:International Journal of Machine Tools and Manufacture, Volume 88
      Author(s): P.W. Butler-Smith , D.A. Axinte , M. Daine , A.R. Kennedy , L.T. Harper , J.F. Bucourt , R. Ragueneau
      Core drilling at small diameters in carbon composite materials is largely carried out using diamond electroplated tools consisting of hollow shafts and simplistic geometries that are likely to work in an abrasional/rubbing mode for material removal. The paper reports a step change in the performance of small diameter core drilling by facilitating a shearing mechanism of the composite workpiece through the utilisation of a novel tool design. This has been achieved by laser producing core drills from solid polycrystalline diamond, incorporating controlled cutting edges where the geometries are defined. To evaluate the efficiency of the shearing vs. abrasion/rubbing cutting mechanisms, a critical comparison between the novel (defined cutting edges) and the conventional electroplated tools (randomly distributed micro-grains) has been made with reference to thrust forces, tool wear mechanisms and their influences on the hole quality (e.g. delamination, fibre pullout). This work has been augmented by studies using high-speed thermal imaging of the two tool types in operation. The examinations have shown that, based on the concept of defined cutting edges in solid diamond, there is the possibility to make significant improvements in core drilling performance, (ca. 26% lower thrust force, minimal tool surface clogging, lower drilling temperatures) resulting in improved cleanliness of fibre fracture and a reduced tendency of material delamination.


      PubDate: 2014-11-24T10:00:40Z
       
 
 
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