| 摘要 |
A tool (20) for cold rolling sheet material having a base gauge G, the tool (20) being cylindrical and having a longitudinal axis and having rows (R12, R13) of teeth (30, 130, 230, 330, 430, 630) extending from the circumferential surface, each tooth (30, 130, 230, 330, 430, 630), having a rounded sheet engaging surface (36, 63) with a first radius of curvature R at and adjacent the peak (11, 31 a, 41 a, 61 a) of each tooth (30, 130, 230, 330, 436, 630), the radius of curvature R extending in a direction between the longitudinal axis and 90° thereto the pitch between adjacent teeth (30, 130, 230, 330, 430, 630) in a row being at least 3 R.. |
