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Study on thermal stress state of electric contact surfacing coating on shaft parts

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Document pages: 14 pages

Abstract: The formation of coating during electric contact surfacing is considered. The mathematical model of coating formation was established. The numerical recursive method of selecting the static equilibrium condition of the basic volume of the coating in the form of finite difference is adopted. The model considers the distribution of thermal properties and geometric parameters along the thermal deformation zone during electrical contact surfacing of dense materials. The results show that the change of velocity asymmetry coefficient leads to the increase of friction coefficient in surfacing area. This provides the formation of higher quality coatings. The limitation of technical capability of electric contact surfacing equipment is related to the size of recyclable materialsarts 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.

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