| 摘要 |
Method of and apparatus for powder-metallurgical manufacture of tubes or like elongated profiles, in which metal and/or metal alloy powder (3) is filled-if applicable with pre-compacting by means of vibrations or the like-into a thin-walled capsule, the latter is subsequently closed and cold and/or hot-pressed by means of universally acting isostatic pressure, and the thus obtained compact is further processed, especially extruded. For forming the tubular compact, the capsule filled with powder (3) after closing (cover 9; 9'; 9'') and isostatic pressing is centrally pierced (hole 26) by means of a mandrel (4, 5) whereby the powder (3) is correspondingly radially compacted from the inside towards the outside. The capsule features a cylindrical outer casing (8), a bottom (14) and a cover (9; 9'; 9''). |
