Abstract
Different interpretations of the mechanism of formation of antifriction coatings by a friction-mechanical method hinders the widespread use of finishing antifriction non-abrasive treatment in the manufacture and repair of parts. It has been established that at the initial stage, the application of an antifriction coating by a friction-mechanical method will be accompanied by a process of micro-cutting of an antifriction material with its subsequent filling of the micro relief cavities in the form of chips. The fulfillment of the condition of micro-cutting of antifriction material is obligatory for the preparation of anti-friction coatings. A theoretical scheme of the process of micro cutting during the formation of an antifriction coating has been developed. The peculiarities of filling the micro relief cavity with antifriction material have been investigated. Taking into account the studied consistency, a new scheme for the application of anti-friction coatings with high tribological parameters has been proposed.
Highlights
Current trends in the production and operation of machines, and continuously increasing demands on the quality of the machines produced, are aimed at increasing their reliability, which largely depends on the performance properties of individual parts
The author notes that the finishing treatment antifriction without abrasive (FTAA) process ends at the phase when there is no bulk plastic flow of the material and the maximum temperature is reached, which eliminates the deformation of the parts
- the space between the residual combs of the microrelief should be considered as grooves for the location of chips, which is formed in the process of interaction of the tool from the antifriction material with the surface of the substrate
Summary
Current trends in the production and operation of machines, and continuously increasing demands on the quality of the machines produced, are aimed at increasing their reliability, which largely depends on the performance properties of individual parts. Improving the performance properties of parts is achieved by improving the quality of working surfaces of parts. The quality indicators include the physicomechanical properties and the geometric characteristics of the surface layer, which are purposefully formed on the finishing operations of the technological process. One of the ways to improve the quality of parts in their manufacture and repair is the modification of the working surface by applying coatings on final operations. Effective and environmentally friendly methods for obtaining coatings, a group of technologies for finishing treatment antifriction without abrasive (FTAA) should be distinguished, which is realized due to the frictional interaction of the processing tool with the surface of the workpiece. The result of the using of such technologies is the coating of copper and its alloys on steel and cast iron surfaces in order to improve burn-in and increase wear resistance due to the subsequent self-modification of surfaces under friction conditions during operation [1]
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