TIKhONOV O. The recovery of cam couplings by electro - contact welding of the additive material accompanied by a form - building upsetting.

The object of research is deterioration of dog couplings at agricultural machinery use, restoration technology development. The goal of research is to develop an efficient technology and optimal parameters for restoration of clutch dogs on agricultural machinery, providing a service life which would come nearer to that of new parts. The methods of research and the outfit include theoretical and experimental methods providing for application of measuring and dinamometric equipment, optical and electron microscopy, methods of mathematical modeling. Theoretical and practical results: the nature of clutch dogs deterioration and their restoration cycle were evaluated as well as heat distribution between electrodes at the moment of passing of welding and preheating impulses of current. Optimal construction of the form-building tool is offered. The operating rigging and instruments for implementation of the new technological restoration process were updated. The novelty of the innovations: new methods of comp lex restoration of sizes and geometry of a part are offered, together with the ways of determining optimal treatment parameters. Complex research was held to determine the quality of the working surfaces of clutch dogs before and after use, and also after their restoration pursuant to the given method. The degree of implementation: the technology developed is used at companies of Kharkiv Region and Poltava Region. The domain of use comprises agricultural machinery repair-and-service companies.