ANALYTICAL APPROACH FOR PREDICTING THE STATE OF STRENGTH PARAMETERS OF ASSYMETRIC GEARS

Abstract

During the process of high-speed gear hobbing of asymmetrical cylindrical gear gears, the surface layer undergoes repeated plastic deformation and leads, in turn, to a change in the physical and mechanical properties and structure of the metal. In order to increase the importance of teeth in machine drives of important machinery, the use of gears with an asymmetrical shape of the teeth is demonstrated, which reflects the functional difference of gears according to GOST 1643-81 and an asymmetrical profile. In accordance with the changes, occurring in the surface layer, the depth of the hardened layer is determined by the change in microhardness across the cross section of the part and by changing the nature of interference lines on x-ray diffraction patterns during layer-by-layer etching of the surface under study depending on the cutting speed. The cutting speed acts as a factor that determines the rate of plastic deformation of the surface layer. With increasing strain rate, the tensile strength and yield strength of structural materials increase. Increasing the yield strength reduces the plasticity of the processed material and acts in the direction of reducing the degree of hardening. With increasing temperature and degree of deformation, the rate of the softening process, which occurs due to recrystallization, increases. An increase in cutting temperature increases the intensity of the softening process and reduces the degree of hardening.