Evaluation of the parameters of contact interaction and wear of parts with cylindrical friction surfaces

Abstract

The purpose of the presented research work was to evaluate various factors affecting the wear process of parts with cylindrical friction surfaces, which will allow to simulate their contact interaction taking into account the parameters of roughness and physico-mechanical properties of the surface layer.Methods. Modeling of the process of contact interaction of cylindrical surfaces is performed by considering the sliding contact of two cylindrical surfaces, represented as the contact of a smooth elastic sleeve and a shaft with the given (equivalent) values of roughness parameters. The modeling takes into account elastic deformations of conjugate bodies, as well as elastic-plastic deformations of micro-dimensions. When modeling a geometric contact, a certain section of the cylindrical surface is considered, located along the plane forming in the section of the cylinder passing through its axis. This section of the cylindrical surface is considered as an elementary area of the total geometric contact area of cylindrical surfaces and is a section of a cylindrical surface, the width of which is determined by the length of the larger axis of the ellipse at the base of the elliptical paraboloid when modeling a rough surface.Results. Based on the modeling of the contact interaction of cylindrical surfaces, the main factors influencing the process of their wear are established, such as: the actual contact area; the amount of convergence of the contacting surfaces; the actual pressure; the intensity of wear of the mating cylindrical surfaces. A kinetic wear model is proposed that takes into account the parameters of the roughness and physico-mechanical properties of the surface layer.Conclusion. Based on the proposed model of wear of parts with cylindrical friction surfaces, taking into account the parameters of roughness and physico-mechanical properties of the surface layer, it became possible to provide the required intensity of wear of cylindrical friction surfaces.