MODELING OF THE INSTRUMENTAL MICROGEOMETRY IN THE PROCESS OF ITS WEARING AT CUTTING OF COMPOSITE MATERIALS

Authors

DOI:

https://doi.org/10.20998/2078-7405.2020.92.22

Keywords:

tool wear, abrasive wear, composites cutting, cutting edge microgeometry.

Abstract

The most difficult problem during the machining of polymer composite materials is the intensive wear of the tool, which leads not only to a decrease in its working capacity, but also sharply worsens the quality of the operations performed. In this paper, we consider the process of wear of the cutting edge of a tool as a change in its microgeometry with respect to the initial state. The physical nature of abrasive wear as a process of contact interaction of the flank surface of a tool with a destroyed filler and intense heat due to friction is considered. Based on the laws obtained experimentally, we can conclude that the initial geometry of the cutting edge of the tool already sharply changes during the running-in period and by the beginning of stationary wear takes on some form, which later changes only quantitatively without distortion of the stable worked-in shape. In fact, we can say that the initial geometry of the cutting edge, selected for some rational reasons or as a result of solving the optimization problem, serves only for effective cutting during the running-in period, after which its influence on the further operation of the tool under stationary wear is not significant.An analysis of the wear process of the cutting edge of the tool during the processing of polymer composites showed that there is a strong correlation between the appearance of wear, the growth of power loading, thermal stress and the appearance of various defects of the treated surface. Various models of describing changes in the microgeometry of the cutting edge in the form of geometric models with their advantages and disadvantages are presented. The modern experimental achievements in studying the nature of changes in microgeometry in the process of wear are examined in detail. On this basis, an assumption was made about the one-parameter nature of changes in the geometry of the cutting edge in the process of interaction with the composite. The further development of the study and the creation of a mathematical model are proposed, linking the change in the tool’s microgeometry over time as a function of one parameter, depending on the initial geometry of the tool.

Author Biographies

Gennadii Khavin, National Technical University “KhPI”, Kharkiv

Doctor of Technical Sciences, Professor of the Department of Technology of Mechanical Engineering and Metal-Cutting Machines, National Technical University “KhPI”, Kharkiv, Ukraine

Hou Zhiwen, National Technical University “KhPI”, Kharkiv

Post graduate student of the Department of Technology of Mechanical Engineering and Metal-Cutting Machines, National Technical University “KhPI”, Kharkiv, 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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