Systematization of interfaces of parts of friction units of machines according to the conditions of their contact

The processes of friction and wear depend largely on the design of parts of friction units, structural materials and hardening technologies, force, kinematic and temperature characteristics in contact and on the operating conditions. Parts that have failed in terms of wear are classified according to various criteria: according to their functional purpose, materials, types and blanks, weight and dimensions, geometric features and other wear conditions. The range of such parts is very extensive and covers both standard and original designs. Operating conditions determine the various dominant types of wear of parts: changes in the size and shape of surfaces, the appearance of scratches, marks and scuffs on mating surfaces, the formation of cracks, wear, crushing and chipping of working surfaces, wear and destruction of threads, etc. In this regard, it is necessary to classify the parts of friction pairs according to the conditions of their contact in order to most effectively apply hardening methods to increase the durability of the technical system. A classification system for the interfaces of rubbing parts is proposed. It includes 16 groups of interfaces that differ in following criteria: the geometric characteristics of the parts, the conditions of the contact, the relative motion and wear.

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