УСОВЕРШЕНСТВОВАНИЕ АНАЛИТИЧЕСКИХ МЕТОДОВ РАСЧЕТОВ ТЕМПЕРАТУРНЫХ ПОЛЕЙ В СИСТЕМЕ РЕЗАНИЯ

Abstract

This paper presents the detailed analytical method of calculation of temperature fields for the blade tool cutting process. The author considers in details the heat sources forms during cutting, the possibility and necessity of schematization both of the heat sources and the forms of interacting bodies. The calculation of temperature in the zone of primary plastic deformation is carried out taking into account the mutual influence of temperature on the intensity of shear stresses within this area. The author determined that the distribution of intensity of friction source along the back surface is stipulated by the nature of changes in friction induced shear stresses and is little different from the uniform one. The author offered the accurate solution of the issue of calculating temperature within the half-space from the action of a rectangular constant rate heat source. Thus, it became possible to determine the rate of constant heat flows on the front and back surfaces. The author tested a hypothesis about the constancy of heat flows rate. For this purpose, each final heat source was presented as a combination of elementary uniform heat sources. The research proved the large non-uniformity of rate distribution of heat sources that act on the cutting tool surfaces. This made it possible to identify new patterns of temperature distribution on the front and back surfaces of tool within various combinations of heat conductivity of the processed and tool materials, as well as the tool wear. The author identified the essential influence of body deferred on the front surface on the amount and direction of heat flows within the front and back surfaces – to the tool or to the blank part, and eventually on the temperature of cutting tool contact surfaces. It allowed development of guidelines for selecting optimal tool material for processing of blank parts with different heat conductivity.