Dimensional Analysis of Technological Processes for Reconditioning Machine Parts

Abstract

Reconditioning of worn-out machine components is a significant reserve for improving the efficiency of repair production. Recovery technologies are necessary not only to extend the service life of machine components, they also can improve the efficiency of machine operation. The greatest costs of the repair complex resources are associated with the restoration of the size, spatial deviations, shape and roughness of worn surfaces. With that the operational properties of surfaces corresponding to their functional purpose, are formed simultaneously and first of all, wear resistance and antifrictionality. The key methods of dimensional reconstruction of machine parts are systematized. The required geometric accuracy of the surfaces being restored is obtained by sequential approximation as the operations and stages of the restoration processing are performed. Saving material and labor resources of the repair complex can be ensured by the proper selection and control of the interoperative dimensions obtained at various machining steps. Therefore, along with the study of the physical and technological capabilities of restoration methods, the dimensional analysis of technological processes with a reasonable allowance setting for operating steps of processing the restored surfaces, the thickness of the applied coatings, their final and intermediate values, the size of additional repair parts, etc. becomes relevant. Methods of dimensional restoration of parts by the type of technological impacts are considered. The article describes methods for determining the optimal part dimensions at the stages of preparation for dimensional restoration, intermediate and final dimensions during processing operations, as well as the thickness of the applied coatings, which reduce energy, material and labor costs and improve the quality and operational properties of the restored parts.