The Influence of Evolutionary Changes in Tribodeformation Parameters of the Turning Process on the Temperature of the Working Surfaces of the Cutter

This article is devoted to the simulation of the temperature distribution on the working surfaces of the tool, taking into account the evolutionary changes in the tribodeformation parameters during the evolution of the cutting system. The determination of contact temperatures was carried out on the basis of mathematical modeling using data obtained in the course of full-scale experiments during longitudinal turning of 15H2NMFA steel work pieces without cooling using cutters with T15K6 carbide inserts. In the course of the durability tests the length of chip contact with the rake surface and the chip shrinkage coefficient were determined, as well as the average temperature in the cutting zone, the value of which was used to assess the adequacy of the results obtained by digital simulation. In the studied cutting system, according to the results of durability tests, a decrease in the chip shrinkage coefficient over the course of processing time was recorded. Simulation of the temperature distribution on the front surface of the cutter was carried out in two versions: taking into account the evolutionary changes of the chip shrinkage coefficient and related parameters - the sliding speed and the thickness of the plastically deformed layer in the chips, and without taking into account their changes. It has been established that simulation corrected for changes in triboparameters makes it possible to obtain the calculated values of the average rake surface temperature that are closest to the experimentally recorded average temperature in the cutting zone.