IMPROVING THE OPERATIONAL STABILITY OF PARTS BY THE METHOD OF COMBINED PROCESSING

Abstract

In the conditions of modern production and the need to save material and energy resources, the problem of developing resource-saving technologies for the restoration and repair of machine parts and units operating under conditions of intense wear is relevant, which leads to premature failure of equipment, reduces the service life of machines, as well as their productivity and affects the quality of operations performed. When carrying out equipment repair work, the process of restoring machine parts by applying coatings of the required thickness and possessing predetermined properties is widely used. These coatings can be obtained by electrocontact methods of applying a functional layer, which will effectively solve the urgent problem of extending the service life of machine parts and units. The paper studies the influence of technological features of surface restoration by the method of electrocontact surfacing of a functional layer in order to determine promising ways to improve the mechanical characteristics of the applied coatings and increase the operational durability of the restored parts. The article presents a comparative analysis of the obtained results of experimental studies of the mechanical properties of applied functional coatings using the standard technology of electrocontact surfacing and using the proposed technological methods that allow increasing the adhesive strength of the functional layer of the coating deposited by the electrocontact method and reducing the thermal impact on the surface structure. It has been established that preliminary application of the technological layer has a favorable effect on the process of forming the functional coating, prevents a decrease in residual stresses in the fusion zone while ensuring the intensification of the electrocontact surfacing process, which allows reducing heat input into the base metal of the product.