| 摘要 |
In order to fix the perforated disc (2) to the bottom (1) of the vessel, the disc is fixed by die work, especially cold coining, in such a way that the metal of said bottom (1) is forced between the openings (4) of the disc (2). Simultaneously with the die operation, a series of reliefs (5) is formed on the surface of the perforated disc (2) and on the surface of the bottom (1) of the vessel. <IMAGE> |
