Zamota T. Scientific basis of running-in of pairings of parts of mobile agricultural machinery at manufacture and repair by method of imposition of alternating electric current.

The purpose of thesis is development of scientific bases of running-in of pairings of parts with microgeometrical rejection by applying the alternating current with processes control for solving problems of durability improving of units and aggregates of agricultural machinery at manufacture and repair. The object of research - the processes of running-in and eliminate of microgeometrical rejections of the working surfaces of parts of the main units and aggregates of agricultural machinery at manufacture and repair. The subject of research - the scientific basis of the running-in method of pairings of parts with microgeometrical rejections, taking into account the controllability and efficiency of the running-in processes for durability increasing of units and aggregates of agricultural machinery at manufacture and repair. The thesis is devoted to solving of the scientific and applied problem of theoretical basis of running-in by method of imposition of alternating electric current of pairings of parts with different materials and types of macrogeometrical rejections with providing of control for process and technological parameters to improve the durability of units and aggregates of mobile agricultural machinery at manufacture and repair. The feasibility of using the method for the running-in of pairings of parts is theoretically justified: cylindrical with obliquity and misalignment; flat with obliquities; spherical with eccentricity and toothing out of alignment. The mechanism of formation of the working surfaces of pairings of parts in the various modes of friction is discovered. The regularities of the raising of the contact area at running-in of pairings of parts of units and aggregates with macrogeometrical rejections are defined. The analytical expressions for the estimation of the contact area in the calculation of the minimum thickness of the electrolyte layer and the maximum speed of elimination of the macrogeometrical rejections which depending from electrochemical-mechanical and geometrical factors are obtained. It is experimentally shown that the method can be efficiently used for running-in of various pairings of machine parts. Using the research results the theoretical foundations of running-in processes control are established. The algorithm of running-in processes control of pairings of parts with maximum eliminate of macrogeometrical rejections efficiency is developed. The technological modes of the method for running-in of different types of pairings of parts of units and aggregates of mobile agricultural machinery, which can significantly improve the characteristics of the working surfaces and increasing its wearproofness are developed.