| 摘要 |
A formed sheet metal material (100) and methods, tools (1, 2, 8) and apparatus for forming the sheet metal material (100) in which a pattern of projections and depressions are cold worked in a first portion(101) and, simultaneously, indicia (103) is embossed in a second portion (102) of the sheet material(100). The cold worked portion (101) is formed with the projections and depressions configured and distributed such that lines drawn on a surface of the formed sheet material (100) between adjacent rows of projections and depressions are not rectilinear. The indicia (103) is indicative of the alignment between the tools (1, 2, 8). |
