Kazan (Volga Region) Federal University, Naberezhnye Chelny Institute (branch), Naberezhnye Chelny, Russia

G. F. Mukhametzyanova, Cand. Eng., Associate Prof., Dept. of Materials, Technologies, and Quality, e-mail: gulnara-ineka@mail.ru
V. I. Astashchenko, Dr. Eng., Prof., Dept. of Materials, Technologies, and Quality, e-mail: astvi-52@mail.ru
I. R. Mukhametzyanov, Cand. Eng., Senior Lecturer, Dept. of Information Systems, e-mail: ilnarr116m@yandex.ru
D. T. Safarov, Cand. Eng., Associate Prof., Dept. of Digital Mechanical Engineering Production Technologies, e-mail: safarov-dt@mail.ru

Various grades of steel are considered according to wear resistance depending on their hardness. The prospects of using Kh12F1 steel for the manufacture of cold forming die tool is shown (cutting and dinking dies, punches). The causes for the low durability of die tool made of Kh12F1 steel are established. The low wear resistance of tool made of Kh12F1 steel is due to low hardness (less than 56 HRC). This is explained by the presence of a decarburized layer on the tool surface with a depth of 0.65 to 0.80 mm after heat treatment and the complete or partial absence of a boronized case on the working surface of the tool, and as a result, the low steel hardness of the the studied tool (less than 40 HRC). It is shown that one of the main criteria for the performance of die tool is its hardness. It has been established that in order to increase the wear resistance of die tool, it is necessary to ensure the use of tools with a hardness of 60 HRC and higher. Based on the results of the research, the optimal heating temperature for Kh12F1 steel hardening was determined to be 1050 °C, followed by tempering at a temperature of 150-180 °C to relieve stress. To eliminate the influence of the decarburized layer on the working surface of the tool, it is proposed to eliminate it by creating the necessary allowance for grinding after heat treatment. To eliminate the impact of the decarburized layer on the working surface of the tool, it is proposed to eliminate it by creating the necessary allowance for grinding after heat treatment. For additional increase wear resistance, nitriding of tool to a depth of 0.15 - 0.25 mm to obtain a surface hardness of ≥ 1100 HV. In case of obtaining the tool hardness after heat treatment is below 57 HRC, nitriding must be a mandatory operation.

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