Abstract
The conditions for the antifriction coatings formation during finishing antifriction non-abrasive treatment (FANT) are analyzed. The requirements for this kind of coatings and the main criteria for assessing their quality are noted. A relationship has been established between the quality of the coating obtained with FANT and the technological factors that determine the conditions for contacting the tool with the treated surface. It is proved that the shape and size of microroughnesses of the treated surface determine the efficiency of the microcutting process and filling the microcavities with the rubbed material. Technological factors influence on the coating quality was investigated during FANT by implementing a multifactor experiment, as a result of which a connection was established between the technological parameters of the process (total friction path, load on the tool), as well as the length of the supporting surface with indicators characterizing the coating quality. Statistical models were obtained for mass transfer of antifriction material, area (continuity) of the coating and surface roughness at natural values of the factors, which made it possible to establish the studied factors influence on the optimization parameters. The analysis of the experimental scattering graphs made it possible to clarify the nature of the factors changes and analyze their mutual influence on the optimization criteria. Taking into account the inversely proportional relationship of the optimization criteria, the achievement of their maximum values at the same time is impossible, therefore, the values are taken according to the final result of the FANT process. The range of the studied factors values is established, the regularities of their change are substantiated from the point of view of the selected optimization criteria. Determination the rational values of the FANT process technological parameters will improve the antifriction coatings quality obtained by a friction-mechanical method.
Highlights
A generally recognized direction in the field of the working surfaces of machine parts quality improving is the development and widespread use of antifriction coatings [1]
After analyzing the Pareto map for surface roughness (Fig. 5), we note the maximum influence on the optimization criterion Y3 parameters x1, x3 and x2, which determine the change in surface roughness
Given the inversely proportional relationship of the optimization criteria Y1(m) and Y2(Sп/S) with Y3(Ra/ Rа init), achieving their maximum values is impossible at the same time, which shows the difference in the rational values of some parameters, especially parameters x3 and x1, take the required value of this parameter based on the final result of the finishing antifriction non-abrasive treatment (FANT) process
Summary
A generally recognized direction in the field of the working surfaces of machine parts quality improving is the development and widespread use of antifriction coatings [1]. From all the variety of methods for obtaining antifriction coatings, coatings with optimal values of hardness and elasticity modulus with increased antifriction properties, providing the favorable internal stresses creation, as well as maximum adhesion characteristics of the coating with the base material, seem to be preferable [2]. Such kind of coatings can be obtained by frictional rubbing of plastic metals by finishing antifriction nonabrasive treatment (FANT) [3]. Studies of the main parameters influence of the FANT process on the formation of an antifriction coating, depending on the conditions of contact interaction of a copper-containing tool with a treated surface, seem to be very relevant
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