Patent ID: 9138796
Filing Date: 2015-09-22
Classification: B21B,B21D,E04C,Y10T

Abstract:
1. A tool ( 20 ) for cold rolling sheet material having a base gauge G, the tool being cylindrical and having an axial dimension extending along an axis of rotation and a circumferential surface having a circumferential dimension extending orthogonally to the axial dimension, the tool having rows (R 12 , R 13 ) of teeth ( 30 , 130 , 230 , 330 , 430 , 630 ) extending from the circumferential surface, each tooth having a rounded sheet engaging surface, each tooth ( 30 , 130 , 230 , 330 , 430 , 630 ) having: a first radius r a second radius r a third radius r a fourth radius r