Design of the Technological Route for Sustainable Machining of Functional Surfaces for Automotive Engineering Parts

Toughening the important demands for the competitiveness of industrial products in general and automotive engineering parts, in particular, requires searching for new effective methods of designing technological routes for machining their functional surfaces. Object-oriented technologies are characterized by using typical technological routes and choosing machining methods based on the criterion of accuracy and quality of surface layers without considering the operation conditions of products and estimation of the level of material degradation of parts. Functionally-oriented technologies consider a large set of technological indicators that affect the formation of operational parameters and reliability characteristics. Sustainable production developing the demands of Industry 5.0 considers economic and social factors and environmental protection when introducing highly efficient technologies. The developed technique of design of the technological route at sustainable machining of functional surfaces for the automotive engineering parts makes it possible to assess the level of parts material exhaustion of a significant area of the specific surface layers by the material homogeneity criterion based on the dispersion of micro-hardness characteristics. Using this technique, the physical processes are analyzed according to the coefficient of variation and the homogeneity coefficient (m) and its derivatives. The machining of a steel shaft is accompanied by a change of the constructively heterogeneous layer of the initial material after blank production to a constructively homogeneous layer of the material of the workpiece with a decrease in the material’s susceptibility to its technological damageability from rough treatments to finishing ones.