Quality of surface modules in machine parts

Bazrov, B. M.; Suslov, Anatoliy; Taratynov, O. V.; Шоев, А.

doi:10.3103/s1068798x13110063

Cited by 10 publications

(6 citation statements)

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“…Thus, it can be argued that the upper finely dispersed (amorphized) layer has higher tribological characteristics, while the breaking-in period can be reduced several times. This is a very important indicator, given that at the stage of breaking-in of friction pairs, the amount of wear can be up to 60 % of the total wear tolerance [9,[21][22]. These circumstances largely explain the mechanism and the main factors determining the increase in tribological properties during laser thermal strengthening, namely, due to an increase in cohesive strength, bearing capacity and improved wear conditions of the modified layer.…”

Section: Discussionmentioning

confidence: 99%

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Laser Modification: Increasing the Wear Resistance of Friction Surfaces

Shastin

Kargapoltsev

2020

KEM

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The article deals with topical issues of studying the physical, mechanical and tribological parameters of the surface layer of machine parts subjected to laser processing. Various options for modifying mating surfaces are evaluated and analyzed. The data of microstructural analysis and indicators of wear resistance are presented. A theoretical model of the wear of heat-strengthened surfaces is proposed, explaining the mechanism for increasing their wear resistance as a result of homogenization of the microstructure of a special surface layer with increased bearing capacity. It is experimentally confirmed that the greatest wear resistance is observed in friction units during mutual modification of mating surfaces.

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Section: Discussionmentioning

confidence: 99%

“…It has been practically established that in most cases an increase in the hardness of a metal is accompanied by an increase in its resistance to wear. However, this statement is ambiguous [9]. High hardness of the surface layer is not always a determining factor in wear resistance.…”

Section: The Methodology Of Experimental Researchmentioning

confidence: 99%

Laser Modification: Increasing the Wear Resistance of Friction Surfaces

Shastin

Kargapoltsev

2020

KEM

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“…Carrying out thermophysical analysis in order to control thermal processes during technological operations is one of the reserves for improving the quality of products [4].…”

Section: Purpose Of the Studymentioning

confidence: 99%

Calculation of Thermal Fields when Drilling Small-Sized Holes in Carbon Fiber Reinforced Plastic

Дударев

2023

E3S Web Conf.

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The Purpose of the paper. The study of thermal physics of the process of drilling polymer composite materials based on the capabilities of the engineering package Comsol Multiphysics. Determination of the values of temperatures arising in the cutting zone when drilling with a cutting tool in polymer composite materials, namely, in carbon fiber. Establishment of the depth of heat propagation inside the workpiece from the edge of the formed hole of the polymer composite material. In this work, the Fourier heat equations are used. Numerical simulation of the drilling process wascarried out in the engineering package COMSOL Multiphysics. A technique for modeling thermal effects during drilling of carbon fiber reinforced plastics in the Comsol Multiphysics environment has been developed. As a result of computer calculation, temperature fields were obtained at the edge of the carbon fiber reinforced plastic hole. The study of the thermal state of carbon plastics has been carried out. On the basis of the conducted research, it was revealed that the temperature during drilling of carbon fiber reaches 650 K. The distance over which heat spreads from the edges of the hole into the workpiece for carbon fiber is 3 mm. The developed technique for modeling the thermal impact of cutting polymer composite materials in the COMSOL Multiphysics environment can significantly simplify complex analytical calculations, help to avoid overheating of the part during drilling, which improves the quality of processing.

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“…It depends on the wear conditions, physical-andmechanical and tribological properties of the mating materials. At a certain optimal roughness value for a given pair and friction conditions, minimal wear is ensured [11][12][13][14][15][16][17].…”

Section: The Mechanism Of Wear Of Hardened Surfacesmentioning

confidence: 99%

Laser Modification of the "Ring-Cylinder Liner" Mating Surfaces

Shastin

Kargapoltsev

2020

KEM

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The article focuses on the topical issues of studying the microstructure, physical-and-mechanical and tribological parameters of the surface layers of a “ring-cylinder liner” friction pair subjected to laser processing. The analysis of the main defects of the elements of the cylinder-piston group of the internal combustion engine, methods for their recovery and increase of tribotechnical characteristics has been carried out. It is noted that the most effective means of increasing the wear resistance of the “ring-cylinder liner” friction pair are various types of heat and chemical-heat treatment of the working surface of the link. As a result of tribological studies, it was found that there is an increase in the wear resistance of a “ring – cylinder liner” friction pair in all the investigated laser exposure modes, taking into account the identified boundary processing conditions for one and the other interfacing elements. The maximum value of wear resistance is observed during laser thermal strengthening of both mating surfaces, at critical levels of laser energy density, which do not cause melting and microcracks in the surface layer. In this case, the wear resistance of the modified surface of the cylinder liner can increase 4.5...5 times, and more than three times for the piston rings.

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Quality of surface modules in machine parts

Cited by 10 publications

References 0 publications

Laser Modification: Increasing the Wear Resistance of Friction Surfaces

Laser Modification: Increasing the Wear Resistance of Friction Surfaces

Calculation of Thermal Fields when Drilling Small-Sized Holes in Carbon Fiber Reinforced Plastic

Laser Modification of the "Ring-Cylinder Liner" Mating Surfaces

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