TECHNOLOGICAL FEATURES OF ELECTROSPARK HARDENING OF AGRICULTURAL MACHINERY PARTS

Abstract

Based on an analysis of operating conditions and the predominant wear patterns of a wide range of agricultural machinery parts, a classification of components strengthened and restored by the electrospark method is proposed, and the methodological and technological features of treatment aimed at increasing their wear resistance and service life are described. The article considers a method for increasing the service life (durability) of the working elements of agricultural machines. Traditionally, working elements worn to the limit size are subject to restoration, while parts with critical wear are machined to the nearest repair size. A disadvantage of this technology is that an excessively large interval between repair sizes is allowed, which leads to a significant reduction in the service life of the working elements. Based on an analysis of operating conditions and the predominant wear patterns of a wide range of agricultural machinery parts, the authors propose a classification of objects strengthened by the electrospark method and describe the technological and methodological features of electrospark treatment to increase their wear resistance and service life. The strengths and weaknesses of the electrospark alloying method, as well as its development prospects and associated risks, are also analyzed. Ways to increase the thickness of the formed coating on worn steel surfaces of automotive parts are identified. Experimental studies have established that the use of electrodes based on tungsten carbide and titanium carbide with the addition of components that form unlimited solid solutions with the surface material and act as fluxes makes it possible to form alloyed coatings with maximum thickness.