Creation of progressive hole processing processes based on the study of contact phenomena during deforming broaching and finishing antifriction non-abrasive treatment in various technological environments

Abstract

This work is devoted to the creation of progressive technological processes for processing holes. The relevance of studying this issue is substantiated, technological environments (TE) used in these operations are listed. The purpose of the work performed is to study the influence of TE on contact phenomena and quality parameters of the treated surface during deformation broaching (DB) and finishing antifriction non-abrasive processing (FANT) and the creation on this basis of new technological processes to obtain parts with improved performance. New methods have been developed for studying contact interaction in the case of DB using solid lubricants, as well as for modeling the FANT process. The conditions for the use of liquid lubricants in the DB are described. It has been established that, when them applied, the altitudinal roughness parameters decrease and the surface layer hardens to a considerable depth. It is shown that the use of solid lubricants in DB is mandatory when processing products from hard-to-work materials and alloys. When them applied, significant plastic deformations of the hole can be made. In this case, the surface layer of the workpiece is little different from the original. The change in the altitude parameters of the rough layer, as well as contact pressures using solid lubricants, was studied. Peculiarities of contact phenomena in the case of DB using solid lubricants are revealed. For this case, a functional relationship has been established between the altitude parameters of roughness and the relative contact pressure. An analytical dependence is proposed for their calculation. The boundary conditions for its application are determined. Formation FANT also occurs when using the TE. It was established that solid lubricants during FANT perform a dual function, namely, technological, like solid lubricant during processing, and operational - improve the quality parameters of the processed parts. The combination of DB and FANT operations allows us to develop a new technological process for processing holes of parts such as bushings and sleeves. This process consists in the use of DB as a roughing and finishing operations, and FANT as a finishing operation, which allows to improve the quality indicators of the machined part

Keywords

• deforming broaching, finishing antifriction non-abrasive treatment, technological environment, solid lubricants, liquid lubricants, contact phenomena, roughness, hardening, quality of the processed surface