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Nowadays, in order to ensure the efficiency of manufacturing of internal carving in hard-working materials, advanced German companies use high-speed steel HSS, HSS-E, PM HSS-E with a new chemical composition. Sometimes wear-resistant coatings are used to reduce the frictional forces and improve the cutting properties of the tool.The article analyzes the influence of chemical-thermal treatment for domestic instrumental steels: P18; P12; P9; P6M5; R6M3.The various methods of chemical-thermal treatment of the tool provide, although in varying degrees, the increasе of stability of the cutting tool, and the information with regard to non-sticking taps is contradictory.Therefore, in order to achieve a positive result, it is necessary to  conduct further scientific research on the influence of technological indicators on the process of making internal carving by brushless  taps after the chemical-thermal processing of the tool.

INFLUENCE OF CHEMICAL-THERMAL PROCESSING OF THE TOOL ON THE METRIC CARVING MANUFACTURING PROCESS IN HIGH-PERFORMED STEELS