ELECTROMECHANICAL MANDRELLING METHOD Russian patent published in 2020 - IPC B24B39/02 C21D1/04 C21D7/06 

FIELD: technological processes.

SUBSTANCE: invention relates to electromechanical mandrelling. Carried out mandrel movement along part hole axis with smooth change of electric current density, passed through mandrel contact place with part hole surface, and forming on surface of its hole of hardened annular sections with different hardness. Radial ultrasonic vibrations are applied on the mandrel, simultaneously with the beginning of its movement along the hole.

EFFECT: as a result, the wear resistance of the hole of the part is increased, the axial forces on the tool are reduced, and its resistance is increased.

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