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Advances in Materials Science and Engineering
Volume 2016 (2016), Article ID 6597317, 14 pages
http://dx.doi.org/10.1155/2016/6597317
Research Article

Investigation of Thermostressed State of Coating Formation at Electric Contact Surfacing of “Shaft” Type Parts

1Department of Surface Engineering, National Technical University of Ukraine “Kyiv Polytechnic Institute” (NTUU “KPI”), Prospect Peremohy 37, Kyiv 03056, Ukraine
2Automated Metal Forming Process and Machinery Department, Donbass State Engineering Academy, Shkadinova 72, Donetsk Region, Kramatorsk 84313, Ukraine

Received 14 March 2016; Revised 28 July 2016; Accepted 6 September 2016

Academic Editor: Sutasn Thipprakmas

Copyright © 2016 Olena V. Berezshnaya et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The forming of coating at electric contact surfacing is considered. The mathematical model of the coating formation is developed. The method of numerical recurrent solution of the finite-difference form of static equilibrium conditions of the selected elementary volume of coating is used. This model considers distribution of thermal properties and geometric parameters along the thermal deformation zone during the process of electric contact surfacing by compact material. It is found that the change of value of speed asymmetry factor leads to increasing of the friction coefficient in zone of surfacing. This provides the forming of the coating of higher quality. The limitation of the technological capabilities of equipment for electric contact surfacing is related to the size of recoverable parts and application of high electromechanical powers. The regulation of the speed asymmetry factor allows for expanding the technological capabilities of equipment for electric contact surfacing. The nomograms for determination of the stress on the roller electrode and the finite thickness of the coating as the function of the initial thickness of the compact material and the deformation degree are shown.