PROCEDURE FOR STRENGHTENING EDGES OF WORK MEMBERS OF TILLERS Russian patent published in 2011 - IPC C21D9/18 C21D5/00 

FIELD: machine building.

SUBSTANCE: surface of back side of edge is heated with electric arc of reverse polarity by means of carbon electrode and successively cooled. Also, the electrode is transferred along a curvilinear trajectory formed with linear transfer along a sharp edge and with a rotation around vertical axis. Angular speed of electrode rotation is determined from the ratio: 3 V/R < w < 9 V/R, where w is angular rate of electrode rotation, rad/s; V is velocity of linear transfer, m/s, R is radius of electrode rotation, m. Arcing is carried out under a pulse mode. Duration and amplitude of current pulses per one revolution of the electrode is increased at moving away from the sharp edge and is decreased at approach to it.

EFFECT: obtaining strengthened layer with alternate cross section facilitating edge self-sharpening.

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