Cutting conditions effect on tool front surface wear rate while workpieces machining

Machine-building Engineering and Machine Science

Mechanical Engineering Technology


DOI: 10.34759/vst-2019-4-209-215

Аuthors

Savel’eva L. V.*, Vendin I. O.**

Bauman Moscow State Technical University, MSTU, 5, bldg. 1, 2-nd Baumanskaya str., Moscow, 105005, Russia

*e-mail: lsavelieva2007@gmail.com
**e-mail: mr.grant025@mail.ru

Abstract

The article tackles the issue of determining the degree of various cutting modes effect (cutting speed, cutting thickness, cutting width, feed, cutting depth, temperature, front angle, vibration) on the front surface wear of the cutting tool.

The authors describe the nature of cutting modes effect on the front surface wear of the tool, and suggest recommendations on optimal cutting modes, which ensure maximum life span of the tool.

The article consists of three main sections: introduction, the bulk section, conclusions.

The introduction considers causes of the tool wear. As a rule, cutting tools wear occurs under the impact of molecular adhesion forces of the treated metal surface with the cutting tool, or under abrasive action of solid particles existed in the structure of the machined material.

The main section regards the tool wear process over the front surface. It analyzes an experimental dependence of the cutting speed impact on the tool wear intensity. As the result of the analysis conclusion was made that the wear increased with the cutting speed increase. According to professor A.M. Danielyan’s studies, with the cutting speed, feed and cutting depth 20% increase the cutter surface wears out correspondingly 3.5, 1.7 and 1.05 times faster. This research data demonstrates that the largest effect may be achieved not by the cutting speed increase, but by the cut width and thickness increase. The effect of the cut thickness and feed on the wear intensity of the cutting tool is analyzed. With large cut thickness (more than 0.5 mm), a misgrowth of significant height is formed, eliminating the contact of the rear surface with the cutting surface. Only the front surface of the tool thereby wears out. With the cut thickness reduction, the wear occurs on both back and front surfaces simultaneously. At very small cut thickness (less than 0. 1.mm), the misgrouth is of rather insignificant height, and the wear occurs only on the back surface. With feed increase, the cut thickness increases either, and, thus, the wear on the front surface increases. The experimental dependence of the cut depth impact on the tool wear intensity is analyzed. As the result, the optimal cutting depth is determined, at which the front surface wear is minimal. The experimental dependence of the tool temperature influence on the tool wear intensity is analyzed. The optimal tool temperature, at which the wear of the front surface is minimal, is determined. The effect of the tool front angle and vibrations on tool wear is analyzed.

Recommendations on selection of optimal cutting modes, ensuring maximum tool life are presented in conclusions.

Keywords:

workpiece, machining, front surface, cutting speed, cutting depth, feed, temperature

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