Kunitsyn M. Technological quality assurance of finishing of cylindrical surfaces with wear-resistant coatings

The purpose and objectives of the study. The purpose of the dissertation is to provide the required quality of the treatment of cylindrical surfaces with wear-resistant coatings, which are prone to cracks on the basis of the study of the technological capabilities of the grinding process by analyzing thermomechanical phenomena and the development of technological selection criteria, the implementation of which will allow the technological parameters of their substantially reduced defects. Object of study. The object of study is thermomechanical processes in grinding parts with coatings, in particular, providing their working surfaces with the necessary quality characteristics. Subject of study. The subject of the study are cylindrical surfaces with wear-resistant coatings, which, when grinding, produce defects such as cracks, chips and burns. Research methods. Theoretical studies are based on fundamental scientific provisions of thermophysics of machining, theory of elasticity, fracture mechanics, fundamentals of engineering technology. The investigations used the apparatus of boundary value problems of mathematical physics equations, the method of singular integral equations for the solution of problems of the theory of cracks. Experimental studies were carried out in laboratory conditions using experimental techniques and modern measuring equipment. Scientific novelty of the obtained results. The scientific problem of determining the calculated dependencies that determine the effect of hereditary defects from previous operations on the fracture toughness of the working surfaces of cylinders with a wear-resistant coating during grinding, the creation of optimal technological conditions for their processing, taking into account the accumulated defects and heterogeneities in the surface.