Аннотация
"This research is funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant No. AP14972884). This research has shown that a serious limiting factor inhibiting the use of harder metals and alloys as dressing materials is the loss of form stability of the cutting edge when, due to high contact loads, it is plastically deformed with deterioration of cutting properties caused by changes in the geometry of the cutting edge. To address this issue, a study of the relationship between the hardness of the machined material and the pre-treatment rate was carried out. Pretreatment was carried out on two heat-treated hardened 20X steel materials with a hardness of HRC 21...23 and HRC 19...20. As a result it is established that by varying the hardness of the machined material during tool lapping it is possible to increase the hardening effect and significantly reduce the material consumption. Also plots of influence of pre-treatment duration on tool life of T5K10 when turning steel 20X (HRC 16...17) and influence of hardness of working material on optimum rate of pre-treatment of R6M5 tool and time of pre-treatment are presented. Keywords: Hardness, pre-treatment, hardening, optimum rate, wear resistance, pre-treatment time. "