WEAR GRINDING WHEELS WITH PRECISE WORKING SURFACE

Authors

DOI:

https://doi.org/10.20998/2078-7405.2020.92.21

Keywords:

dimension wear, specific wear, intermittent grinding, steady grinding, creep feed (deep) grinding, cutting projections.

Abstract

. The use of circles with an intermittent working surface is an effective means of increasing productivity and reducing the heat stress of the grinding process. These positive effects are largely determined by the appearance of high-frequency oscillations in the elastic system of the machine, which facilitate the chip formation process and create conditions for continuous self-formation of the cutting microrelief of the working surface of the abrasive tool. However, for certain aggregates of rigidity of the elastic system of the machine, geometric parameters of the macrorelief of the working surface of an intermittent circle, and parameters of the cutting mode, parametric resonance may occur, which is accompanied by catastrophic wear of an abrasive tool and a deterioration in the geometric and physical-mechanical characteristics of the quality of the surface layer of the workpiece. The aim of the work is to study the influence of grinding mode parameters and geometric parameters of the working surface of intermittent abrasive wheels on their dimensional and linear wear, as well as identifying areas of their rational use. It was found that oscillations during intermittent grinding caused by parametric resonance can be significantly reduced or eliminated completely by increasing the rigidity of the elastic system of the machine, using discontinuous circles of a certain geometry, and increasing the peripheral speed of the circle. Based on the experiments to determine the specific wear of the elbore dashed circles, the expediency of their use in deep encryption is substantiated. t is established that to increase dimensional stability of an abrasive tool it is necessary to increase the circular velocity to 40 m / s and to provide in the machines the possibility of preserving the constancy of the circular velocity of the circle as it is worn.

Author Biographies

Oleksiy Yakimov, Odessa National Polytechnic University, Odessa

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

Liubov Bovnegra, Odessa National Polytechnic University, Odessa

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

Sergey Uminsky, Odessa State Agrarian University, Odessa

PhD., Associate Professor of the Department of Agroengineering Odessa State Agrarian University, Odessa, Ukraine

Vladimir Tonkonogyi, Odessa National Polytechnic University, Odessa

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

Yuliia Shichireva, Odessa National Polytechnic University, Odessa

PhD, Lecturer at the Road College of Odessa National Polytechnic University Odessa National Polytechnic University, Odessa, Ukraine

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Published

2020-07-01

Issue

No. 92 (2020): CUTTING & TOOL IN TECHNOLOGICAL SYSTEM

Section

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

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