DEVICE FOR SPRING CONTACT HARDENING Russian patent published in 2012 - IPC B21F35/00 F16F1/06 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in devices intended for increasing spring capacity and working performances. Proposed device comprises barrel to receive inserts and spring to be tested arranged there between. Barrel ID varies from compressed spring diameter to that of coiled spring. Punch with ball surface stays in contact with ball surface of top insert attached to said punch by screw with washer to rotate and displace relative to barrel axis and allow its axis to deflect from punch axis. Spline grooves are made on punch screw and top insert central bore to arrange spring-loaded alternating friction discs jointed by splines with punch screw spline grooves and top insert spline grooves. Insert end faces are provided with surfaces with thrust that features depth making, at least spring coil height to follow profile of the spring extreme coil end faces. Overrunning coupling with screw surface is fitted inside bottom insert to interact with screw surface of the rod coupled with press bottom cylinder ejector. Rod cylindrical section has alpines or spline groove to interact with mate splines or keys of the device bottom plate.

EFFECT: possibility of use in quantity production, ruled out hand work.

2 cl, 1 dwg