INFLUENCE OF THE GEOMETRIC CHARACTERISTICS OF THE DISCONTINUOUS PROFILE WORKING SURFACES OF ABRASIVE WHEELS FOR PRECISION AND TEMPERATURE WHEN GRINDING

Authors

DOI:

https://doi.org/10.20998/2078-7405.2021.94.13

Keywords:

macrotopography of the working surface, surface roughness, degree of tempering, dynamic interaction, processed material

Abstract

Grinding is the most common finishing method for hardened steel parts. Grinding is accompanied by a large heat release in the cutting area, under the influence of which structural changes appear in the thin surface of the processed parts, tensile stress and even microcracks, which significantly reduce the operational reliability of machines that include these parts. The use of abrasive wheels with an intermittent working surface makes it possible to reduce the temperature in the area of contact of abrasive grains with the material of the workpiece and, as a consequence, stabilize the quality of the surface layer of the workpieces. High-frequency vibrations in the elastic system of the machine, accompanying the work of an intermittent wheel, are a positive factor that reduces the energy consumption of the grinding process. However, under certain conditions of dynamic interaction of the tool with the workpiece, parametric resonance may occur, which worsens the geometric and physical-mechanical parameters of the quality of the surface layer of the processed part. The aim of the work is to realize the possibility of predicting the quality parameters of the surface layer of parts during intermittent grinding by studying the influence of the design features of the macrotopography of the working surface of abrasive wheels and processing modes on the nature of the dynamic interaction of the tool with the workpiece and the heat stress in the cutting area. It was found that the parametric vibrations of the elastic system of the machine tool can be shifted to a more stable area, due to an increase in the number of interruptions of the working surface of the abrasive wheel with a constant ratio of the length of the protrusions and depressions. The increase in the number of breaks on the wheel also contributes to a decrease in temperature in the cutting area. It was found that to maintain the stable operation of the elastic system of the machine, it is necessary to reduce the number of cavities on the grinding wheel with an increase in the cutting speed. However, both of these actions are accompanied by an increase in the heat stress of the grinding process. It has been experimentally established that for ordinary (pendulum) grinding, it is possible to achieve an increase in processing productivity by increasing the speed of the longitudinal movement of the table.

Author Biographies

Oleksiy Yakimov, Odessa Polytechnic State University

Doctor of science, professor, Head of the Department of Information Technology for Design in Mechanical Engineering Odessa Polytechnic  State University, Odessa, Ukraine

Liubov Bovnegra, Odessa Polytechnic State University

PhD., Associate Professor of the Department of Information Technology for Design in Mechanical Engineering, Odessa Polytechnic State University, Odessa, Ukraine

Vladimir Tonkonogyi, Odessa Polytechnic State University

Doctor of science, professor, Head of the Industrial Technologies, Design and Management Institute, Odessa Polytechnic State University, Odessa, Ukraine

Vladyslav Vaysman, Odessa Polytechnic State University

DrSc, Professor, Odessa Polytechnic State University, Odessa, Ukraine

Victor Strelbitskyi, Odessa National Maritime University

PhD, Professor Ast, Odessa National Maritime University, Odessa, Ukraine

Inna Sinko, Odessa Polytechnic State University

PhD, Professor Ast, Odessa Polytechnic  State University, Odessa, Ukraine

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Published

2021-06-16

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Section

Mechanical processing of materials, the theory of cutting materials, mathematical and computer simulation of machining p

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