DEVICE FOR ROLLING OF COARSE THREAD AND WORMS BY ROLLERS Russian patent published in 2014 - IPC B24B39/04 B21H3/04 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming. Proposed device comprises spiked rollers resting on two mid self-locating torus-conical washers. One said washer features bulged conical side with radius R₁=3.7 q²m/z, while another washer features recessed conical side with radius R₂=1.5 q²m/z, where m is thread or worm profile modulus, q is the ratio of thread profile mean diameter to modulus m, z is the number of thread or worm starts.

EFFECT: higher wear resistance of rolled screw surface.

2 dwg, 1 tbl