IMPROVEMENT OF TECHNOLOGY MANUFACTURING OF THE TANGENTIAL ROTARY CUTTERS

Technology of production of tangential rotary cutters currently used at national manufacturing plants does not provide enough wear resistance of rock cutting tool. The main drawback of the cutter manufactured is a low hardness of the head part holders, which leads to its premature wear and the consequent loss of efficiency cutter tool. Working by tools with a broken parameters is lead to enhance the dynamics of the work of the cutter head of roadheader, poor performance and resource tunneling machine. After analyzing the basic operations used by a typical thermal processing (TR) cutters were concluded that the surface hardness of the material of the cutter body is provided only martensitic transformation of austenite medium carbon steel used and does not reach for this reason large quantities (38–45 HRC). As a result, the wear resistance and the cutter body, in practice operate, as no different high levels.

In an article on the example of steel 30KhGSA as the most frequently used material holders cutters experimentally substantiated the use of technology in the manufacture of high-temperature thermomechanical treatment cutters as a way to improve the wear resistance of their toolholders. In accordance with the results presented experiments proved that the application of high-temperature thermomechanical treatment steel (strain at 900 °С, water quenching, tempering at 230 °С) leads to a substantial increase of its hardness (23%) and wear resistance (38%) compared to typical heat treatment used in the manufacture of cutters at the factory. Advanced technological scheme of the manufacture of cutters with enhanced wear resistance is described in the article.

Keywords

Tangential rotary cutter, material of cutter body, wear resistance, thermomechanical and thermal treatment.

Issue number: 3
Year: 2017
ISBN:
UDK: 622.23.05
DOI:
Authors: Chupin S.A., Bolobov V.I., Bochkov V.S.

About authors: Chupin S.A., Assistant of Chair, e-mail: Staseg-88@mail.ru, Bolobov V.I., Doctor of Technical Sciences, Professor, e-mail: Boloboff@mail.ru, Bochkov V.S., Candidate of Technical Sciences, Assistant of Chair, e-mail: bochkof@list.ru, National Mineral Resource University «University of Mines», 199106, Saint-Petersburg, Russia.

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IMPROVEMENT OF TECHNOLOGY MANUFACTURING OF THE TANGENTIAL ROTARY CUTTERS

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