St. Petersburg Mining University, St. Petersburg, Russia:

M. A. Admakin, Cand. Eng., Associate Prof., Dept. of Mechanical Engineering, e-mail: Admakin_MA@pers.spmi.ru
A. D. Khalimonenko, Cand. Eng., Associate Prof., Dept. of Mechanical Engineering, e-mail: Khalimonenko_AD@pers.spmi.ru
V. P. Zakharova, Cand. Eng., Associate Prof., Dept. of Mechanical Engineering, e-mail: zakharova_vp@pers.spmi.ru
Nguyen Van Dao, Postgraduate Student, Dept. of Mechanical Engineering, e-mail: nguyenvandao091097@gmail.com

This work is dedicated to the study of machinability during mechanical cutting machining of low-magnetic high-manganese steels. In this work, the scope of application and the main problems arising during mechanical cutting of low-magnetic high-manganese steels are considered. This work presents the results of studies carried out during roughing and finishing external turning of blanks made of round-section rodmaterial and during drilling and threading in the holes of blanks made of low-magnetic high-manganese steel grade 80Г20Ф2Ю (80Mn20V2Al). The wear dependences of a cutting tool made of various tool materials on the back face and cutting forces on the cutting time during roughing and finishing turning, drilling and threading are investigated. Experimental results are presented, empirical dependences of cutting forces and wear along the back face of tools used in the machining process are derived. Mathematical processing of a one-factor experiment on the processing of workpieces made of low-magnetic high-manganese steels was carried out by the method of least squares. The formulas derived from the results of the experiments for the dependence of tool wear along the back face on the operating time for various types of mechanical cutting allow us to develop an optimal strategy for processing workpieces made of low-magnetic, high-manganese steels for automated production conditions. The work presents recommendations on the marginal wear magnitude of the tool used for cutting lowmagnetic high-manganese steels. The paper provides the necessary explanations and recommendations on machining by cutting, allowing to optimize the choice of the state of the tool's cutting part and the technological processes of manufacturing parts from lowmagnetic high-manganese steels.

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