Development of the material homogeneity criterion for the analysis of processes of technological inheritability for quality parameters of machine parts

Abstract

The material homogeneity criterion and the indicators characterized by this criterion were developed due to the LM-hardness method. The research results were tried out during the manufacturing of steel shaft. The values of the Weibull homogeneity coefficient during shaft’s machining increase from 6.12-11.46 (for initial workpiece) to 198.23-344.59 (for finish part) during its manufacturing. Besides the constant of the material Am in the manufacturing chain “initial workpiece – finish part” changes from 0.814 to 0.966 for different necks of the shaft during its machining by cutting and abrasive methods. The elaborated method can be used when manufacturing and operation of different mechanical engineering parts for analysis of the change of their material homogeneity during machining, control and determining of their residual life.