ADHESIVE WEAR OF TOOL STEELS WITH FUNCTIONAL COATINGS

Abstract

When processing metals by cutting, there are several materials prone to adhesion. This phenomenon leads to a change in the geometry of the cutter, cutting force and surface quality, technological dimensions of the detail. In this work, experimental studies of the processes of dry friction of tool steels with coatings were carried out to evaluate the effectiveness of reducing the process of adhesive bonding of materials. It was established that the nature of formation, destruction and size of adhesive areas depends on the chemical composition of the material and modes of friction. High-strength chromium-manganese steels are most prone to adhesion and microburring. It is shown that increasing the cutting speed cannot always be used to prevent adhesion. Along with this, adhesion reduction can be achieved using single-layer and multi-layer coatings with a defect-free structure and moderate friction modes. It has been experimentally proven that electrolytic single-layer nickel and chromium coatings contribute to the formation of growth on the studied materials and this phenomenon does not depend on friction modes. At the same time, electrochemical coatings, which have a defect-free structure, are almost not amenable to adhesion.