BURNISHER FOR SELECTIVE ELECTROMECHANICAL TEMPERING OF CYLINDRICAL HOLES OF PARTS Russian patent published in 2013 - IPC B21B25/00 B29D30/12 

FIELD: machine building.

SUBSTANCE: invention relates to machine building, in particular, to tooling equipment for surface strengthening and may be used to strengthen cylindrical holes of parts. A burnisher for selective electromechanical tempering of cylindrical holes of parts comprises a strengthening tooth, a mandrel, a current-insulating bushing, has a guide, the strengthening tooth is made as shaped with operating surfaces, arranged symmetrically relative to each other, between the working surfaces of the strengthening tooth there are slots, which form elastic segments, at the ends of the mandrel and the guide there are forks, connected with a rectangular prism, at the same time the fork of the guide with the rectangular prism is connected in a non-detachable manner, and the fork of the mandrel - in a detachable manner, besides, on the mandrel there is a flat, on the threaded part of the mandrel there is a conical nut.

EFFECT: increased quality of processing of an inner part of a part and service life of a burnisher.