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Journal of Machinery Manufacture and Reliability
Journal Prestige (SJR): 0.238  Number of Followers: 2  Hybrid journal (It can contain Open Access articles)ISSN (Print) 1934-9394 - ISSN (Online) 1052-6188 Published by Springer-Verlag  [2468 journals]
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- Durability Criterion for Lubricant Oils Alloyed with Micro/Nanoparticles
of Insoluble Friction Modifiers-
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Abstract: An equation is proposed for estimating the resource of a lubricating medium in a heavily loaded friction unit. The durability of Mobil Ultra SAE 10W-40 oil and the same oil with additives of fullerene С60 and serpentinite was estimated. Based on these values, a criterion for the durability of lubricants in friction units was constructed, which makes it possible to provide the rationality of introducing insoluble micro/nano additives into the lubricating medium. The possibility of increasing the antifriction characteristics of the studied oil by doping these oils with micro/nano additives of insoluble friction modifiers was confirmed.
PubDate: 2023-08-01
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- Application of a Pantographic Design Obtained by the Method of SLM
Printing and Study of the Influence of Postprocessing with Application of
Damping Coatings-
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Abstract: To deal with residual stresses that arise after the application of the selective laser sintering method, in this article the heat treatment method according to the State Standard and vibration tumbling in a drum with ceramic “chips” are chosen. During operation, various vibrations occur, which lead to the destruction of the structure. To deal with vibrations of this kind, it is proposed to apply coatings to the structure. Such coatings increase the resistance to oxidation, corrosion, etc. In addition, they absorb vibrations (damping), thus removing resonance. At the same time, the service life of a coated product relative to an uncoated part is guaranteed to be 5–20% higher.
PubDate: 2023-08-01
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- Development of Methods for Optimization and Machine Design of the
Connecting Unit of Oil-Field Equipment-
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Abstract: It was determined experimentally that to provide complete sealing, the value of the contact pressure on the sealing surface must be three times greater than the internal pressure. The tightness of flange connections is provided by creating the necessary pressure on the sealing surfaces of the flanges. Moreover, the required specific pressure is created in the seals by tightening the bolts fastening the flanges. The amount of leakage is influenced by the surface roughness and the accuracy of the manufacturing of the sealing elements.
PubDate: 2023-08-01
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- Model of Data Transfer through Elements of an Automated Communication
Control System-
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Abstract: A model of data transfer through elements of an automated communication control system on the basis of a Petri net, which allows one to monitor and control the state of communication system autonomically with accounting for preset time restrictions and possible external impacts, is discussed. The general descriptive approach to development of the model is described without accounting for specific external impacts. Three possible states of the communication system are described with accounting for possible negative perturbing impacts.
PubDate: 2023-08-01
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- The Influence of Low-Temperature Plasma Modification on Contact
Interactions of Cutting Tools-
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Abstract: This article presents the results of comparative analysis of diffusion and chemical processes running upon contact interaction with processed material of a regular cutting tool and of a tool with the surface layer of the working part modified by the impact of gas discharge.
PubDate: 2023-08-01
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- Vibrations of Periodic Systems Consisting of Identical Subsystems of an
Arbitrary Structure-
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Abstract: Vibrations and waves are investigated in periodic systems that consist of identical subsystems having an arbitrary structure. Spectral regularities are found for such systems. Their dispersion curves are shown to consist of branches, each of which corresponds to its own mode shape of elastic vibrations of the subsystem. The presence of band gaps in such systems, in which a harmonic signal cannot be transmitted, was revealed, and their boundaries were determined. The mode shapes of vibrations in various frequency ranges are obtained. Modulated waves are shown to arise in the system due to modulation by lower frequencies, which correspond to system vibrations without taking into account the elastic properties of the constituent subsystems.
PubDate: 2023-08-01
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- A Maintenance and Repair Decision Support Model for Transport and
Technological Machines-
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Abstract: The digital immaturity of the technological machines service support sector is established, which is explained by an information failure in the formation of a databank of production and structural, organizational, and technological processes. It is established that direct application of the developed Industry 4.0 technologies to the service support sector of transport and technological machines is almost impossible. An analysis of the significance of repair and recovery activities for transport and technological machines in terms of maintaining their performance and resource optimization is presented. A term is introduced, and the description of the concept “digital image of the repair and recovery technology” (DIRRT) is given in the context of a single service center/enterprise. The DIRRT is characterized by stepwise construction of an element-by-element predictive–probabilistic model of failure of individual parts with allowance for changing load characteristics during operation and creating a grid of the predictive maintenance requirement throughout the service life of the technological machine as a whole. An algorithm is developed for involving the digital module into the organizational production and technical infrastructure of the service center when optimizing repair and recovery of transport and technological machines.
PubDate: 2023-08-01
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- Electrochemical Concepts in Tribology and Material Processing
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Abstract: Issues related to a generalized description of the lubricant degradation, which ultimately leads to the degradation of the structural material during friction and cutting, are considered. The electrochemical interpretation of processes based on the theory of acids and bases is considered in the case when a lubricating medium is not a classical electrolyte.
PubDate: 2023-08-01
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- A Fracture Criterion with Biaxial Constraints of Deformations along the
Front of a Normal Rupture Crack-
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Abstract: In this article, a new fracture criterion is formulated for a normal rupture crack, the most common in practice, based on the assumption that the tangential stresses in the prefracture zone are equal to the local strength of the material. In this case, the size of the prefracture area and the local strength are determined taking into account the nonsingular Тхx and Тzz stresses included in the asymptotic stress distribution according to Williams and characterizing the two-dimensional local constraint of deformation along the crack front in three-dimensional bodies. An expression for the effective stress intensity factor is obtained. In addition to the classical stress intensity factor, it includes the ratios of the Тxx and Тzz stresses to the yield strength. This makes it possible to take into account the restriction of deformations in the transverse (due to Тxx stresses) and longitudinal (due to Тzz stresses) directions in the vicinity of the crack front. Verification of the developed software tools and the proposed fracture criterion has been carried out. Examples of the implementation of the developed criterion for assessing crack resistance of a plate stretched in one or two directions with a coaxial transverse crack are given.
PubDate: 2023-08-01
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- Residual Stresses in Coatings Formed by Electrospark Treatment
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Abstract: A review and analysis of the influence of electrospark treatment on the residual fatigue limit of parts as well as of the degree of influence of electrospark surfacing on the fatigue strength of automotive parts restored by electrospark treatment are given. We present rational technological regimes for electrospark coating deposition and rolling under plastic deformation of the surface of electrospark coatings used in the restoration of worn parts.
PubDate: 2023-08-01
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- The Influence of Temperature on the Mechanical Properties of the Surface
Layer of a Radiationally Strengthened Fluoropolymer-
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Abstract: This article discusses the influence of temperature on the mechanical properties of a fluoropolymer treated by λ irradiation above the melting point. The statement of the high efficiency of this strengthening technology on the tribological properties of the fluoropolymer–steel friction pair is substantiated. The changes in mechanical properties in a thin surface layer of the fluoropolymer as a consequence of heating to 400°C are studied using kinetic microindentation. The material hardness, elasticity modulus, total work of indentation, and its elastic constituent are analyzed. It is proposed to apply friction pairs containing radiationally strengthened fluoropolymer parts in the axial piston pumps of hydraulic systems in order to increase the probability of faultless operation.
PubDate: 2023-08-01
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- Visualization of the Design Parameters of Worm Gears
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Abstract: Methods for graphical representation of the connection between the initial data and the main results of the design of worm gears are considered. Graphs have been developed that visualize the initial data, the resulting dimensions, and the sliding speeds in a wide range of gear ratios. Working with summary graphs prevents errors and significantly reduces the time for selecting transmission parameters in accordance with the performance criteria.
PubDate: 2023-08-01
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- Development of an Algorithm for Calculation of the Effective Parameters of
a Blast Pulse during Explosive-Reactive Destruction of a Rock Mass-
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Abstract: The change in the spectral density of a stress pulse during the operation of an explosive facility in the rock mass is simulated. An algorithm has been developed for calculating the distribution of the spectral density of the pressure pulse for nonstationary gas-dynamic processes, taking into account the physical and mechanical properties of rocks.
PubDate: 2023-08-01
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- Application of Protective Technological Coatings under Low-Temperature
Deformation of Hard-to-Deform Alloy Blanks-
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Abstract: Protective technological coatings for low-temperature deformation of semi-finished products and products from hard-to-deform alloys (titanium, zirconium, etc.) are considered. The process of low-temperature isometric product deformation made of the VT6 alloy, friction, and the separating properties of protective technological coatings are studied by compression of ring samples. Laboratory studies and industrial tests of pilot batches of coatings are carried out. Recommendations on the use of protective technological coatings are presented.
PubDate: 2023-08-01
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- Project Assessment of the Reliability of the Joint of a Circulation-Loaded
Ring of a Rolling Bearing with a Shaft of Tolerance Class js6-
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Abstract: Study and assessment of the reliability of a joint of a circulation-loaded ring of a rolling bearing 50217 and a flange of the Yaroslavl Engine Plant gearbox demultiplier have been carried out. It has been found that, upon adding the dispersion of the sizes of the analyzed holes and shafts, a dispersion of gaps and interferences is formed, in which the probability of occurrence of interference fits (93%) prevails. After pressing, due to the collapsing of the roughness of the hole and the shaft, the probability of interference with a gap increases (51.7%). In addition, upon operating under the action of a load, the possibility arises that joints with an actual interference less than the smallest functional one (8.1 µm) can turn. It has been proven that, when shaft tolerance class js6 is assigned, interference with a gap will prevail in the joint, which will lead to rotation of the circulation-loaded bearing ring in more than 80% of the joints, significantly reducing the reliability of the demultiplier bearing assembly and the gearbox of the Yaroslavl Engine Plant engine as a whole.
PubDate: 2023-08-01
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- Role of the Pulse Current Duty Cycle during Titanium Tension
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Abstract: The effect of a pulsed current on titanium tensile deformation obtained by postdeformation annealing after cold rolling of the coarse-grained and ultrafine-grained states has been considered. The effect of the duty cycle of the pulse current over a wide range on the shape of the stress–strain curves and mechanical properties has been studied. It is shown that an increase in the duty cycle results in an enhancement in the thermal effect of the current and a decrease in the flow stresses, strength, and plasticity, as well as in intense necking. A decrease in the duty cycle leads to the absence of heating and the occurrence of the electroplastic effect and an increase in the strength and plasticity, which depends on the structural state of coarse-grained titanium and the method of titanium production. The possible physical mechanisms of hardening associated with twinning, strain aging, and low-cycle fatigue have been considered.
PubDate: 2023-08-01
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- Temperature Regimes of a Kamaz-5320 Vehicle Gearbox Bearing Unit to Ensure
Testability-
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Abstract: The results of analytical study on the temperature regimes of the gearbox bearing units are given, and their diagnostic criteria are substantiated. We prove experimentally the possibility of practical application of the automatic thermal diagnostics based on the study of the thermal regimes of the bearing unit.
PubDate: 2023-08-01
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- The Effect of Thermal Treatment on Weld Structure of the VZh178P Alloy
after Rotational Friction Welding-
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Abstract: Structural metallographic studies of the VZh178P Ni-based superalloy after rotation friction welding performed using the PSTI-400 unique Russian-made setup are presented. The effect of individual welding parameters and their combinations are studied on the microstructure of welded joints of the heat-affected zone and the main material and Vickers microhardness in these areas. After preparing, welding, and cutting, the samples were heat-treated and the results were presented.
PubDate: 2023-06-01
DOI: 10.3103/S1052618823030044
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- Theoretical Foundations of Adapted Gear Trains during Operation under
Skewed Conditions-
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Abstract: This article discusses the so-called gear train with adapted properties. Such gear trains are used to increase the load capacity of gear coupling by decreasing the maximum contact stresses by means of an increase in teeth contact compliance operating under skewed conditions. An approach has been proposed, including an analytical solution to the problem on its basis, and the equations for determination of the maximum contact stresses of gear teeth with annular grooves have been obtained. The decrease in the contact stresses of teeth with adapted properties upon skewing has been estimated and compared with those of regular teeth.
PubDate: 2023-06-01
DOI: 10.3103/S1052618823030123
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- Evaluation of the Operational Reliability of Gear Hydraulic Pumps Repaired
Using the Electric Spark Processing Method-
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Abstract: This work is devoted to evaluation of the efficiency of a new technology for repairing gear pumps with the restoration of worn surfaces of resource-defining mates of parts and increasing their wear resistance. Hydraulic pumps repaired by the proposed technology showed an increase in the average overhaul life in conditions of real operation of 1.07 times as compared with the resource in the prerepair operation period.
PubDate: 2023-06-01
DOI: 10.3103/S1052618823030093
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