METHOD OF COMBINED HARDENING OF PARTS SURFACES Russian patent published in 2012 - IPC C21D7/13 C21D1/06 B24B39/00 

FIELD: machine-building industry.

SUBSTANCE: viscous deformation of part surfaces is performed with a tool by carrying it through the area of tool contact with a treated part surface of alternating current. The viscous deformation of part surface is performed to the hardening depth δ, which is equal to an allowance for limiting single-sided part wear if crossing the area of current contact of i₁ density to be defined by the formula: where: V - speed of tool movement, (m/s); C - carbon content in steel, %. Finally, the surface layer of the part is hardened to the run-in thickness by crossing area of current contact with density i₂, to be defined by the formula: i₂=(0.1-0.2)·i₁<i_min, where: i_min - minimum current density when hardened surface layer is formed.

EFFECT: improved run-in operation of steel part friction surfaces and increased wear resistance.

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