Mathematical model of the process of polishing diamond-like PVD coating by scrub


Аuthors

Korolev A. V.1*, Korolev A. A.2, Avdonin K. A.3**

1. Yuri Gagarin State Technical University of Saratov, 77, Politechnicheskaya str., Saratov, 410054, Russia
2. Saratov State Academy of Law, 1, Volskaya str., Saratov, 410056, Russia
3. Engels Design Bureau «Signal» named after A.I.Glukharev, 14, quarter 5, Engels-19, Saratov region, 413119, Russia

*e-mail: science7@bk.ru
**e-mail: kirill.avdonin@mail.ru

Abstract

The article presents mathematical modeling of the process of polishing diamond-like PVD coating of rotating parts by the brushing method. The relevance of the study is due to the widespread use of diamond-like coatings in the automotive, aerospace, electronics and medicine industries, where it is necessary to reduce friction, wear and corrosion of parts operating in extreme conditions. The main problem is to achieve low surface roughness, which traditional polishing methods perform with low productivity and insufficient efficiency. The developed model describes the mechanism of mass chipping of microroughness’s of a brittle coating under the impact of metal threads of a polishing tool. The paper provides a formula for calculating the chipping value of the microroughness top, taking into account the mass, geometric and mechanical characteristics of the metal thread, as well as the microrelief parameters and the impact speed. The microscopic profile of the coating is approximated by a sinusoid, which allows us to determine the radius of rounding of the microroughness tops and relate it to the surface roughness parameters. The polishing scheme with rotation of the part and the tool is analyzed, which allows calculating the number of impacts on each vertex of the microroughness and their effect on the reduction of roughness during processing. The model takes into account the change in the intensity of impacts as the height of the microroughness decreases, which reflects the dynamics of the polishing process. The performed computer modeling confirmed the complexity of the mechanism of brittle fracture of microroughness’s, caused by the interaction of theories of impact, brittle fracture and contact of solids. The obtained results allow a deeper understanding of the brushing process and effective control of the technology of polishing diamond-like coatings to achieve the specified parameters of the microrelief and increase productivity.

Keywords:

diamond coating, polishing, surface roughness, polycrystalline diamond, PVD coating

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