| 摘要 |
1506339 Making extrusion blanks F A VEREINIGTE EDELSTAHLWERKE AG 6 Dec 1976 [18 Dec 1975] 50838/76 Headings B3P and B3A A blank for hot extrusion is substantially cylindrical and has continuous or interrupted circumferential beads at least at each end. The beads are formed by machining, forming weld beads or securing strips by spot welding. The space formed between the beads accommodates a lubricant, e.g. glass power, and the blank may be of non-ferrous metal or alloy steel such as tool steel. |
