Technological Control on the Heredity of Operational Quality Parameters

Abstract

Technological heredity of operational properties in the processes of manufacturing, operation, and restoration of machine parts is proposed to describe the graph reflecting the coefficients of transmission and mutual influence of physical, mechanical, and geometric parameters. The technological control methods of the heredity of operational properties of parts are considered, including the following: measuring parameters of the most critical parts; determining technological heredity mechanisms on the basis of transfer coefficients and mutual influence of operational properties; analyzing technological barriers during intensive effects of energy flows; and developing measures for controlling technological processes. The technological heredity of the operational quality parameters in the process of recovery and processing of the bearing journals and cams, as well as wearing of the camshaft working surfaces over admissible limits are considered. According to the findings, it is recommended: to control the deformation of the part after machining operations; to eliminate the editing operation after heat treatment; to use a combination of methods and a combination of technological effects in recovering the part surfaces with wear exceeding the maximum permissible values. The need for surfacing and subsequent tempering processes to ensure consistently high physicomechanical properties of coating materials and strictly regulate the modes of surface finishing is noted.

The Issues of Improving Surfaces Quality and Productivity in the Grinding with the Copy Method for Shaped and Tooth Surfaces

“…After processing, the values of the residual-unremoved shares on the grinded profile also differ analogously to the difference in the cutting depths, but they are relatively small. According to the principle of heredity of the technological process, the fact that the depth of cut is variable along the processed surface causes changes in the physical and mechanical processes occurring in the elementary cutting regions [1,2,4,5,[10][11][12]. As a result, similar processing errors appear on the shaped surface ground by copying, its quality indicators for accuracy and unevenness are lowered, and the efficiency of forming the shaped profile is not ensured.…”