| 摘要 |
PURPOSE:To make a die small in size and to reduce remarkably the production of press parts by providing a flanging die changing device in a flange forming stage of two press parts having almost the same shapes. CONSTITUTION:In a flanging work of parts A at the 3rd stage, a sectional die 11 is lowered to a processing position by interposing a backing plate 19 between a slide block 1 and a base plate 16 with the aid of a cylinder 20. A part 2 to be pressed is mounted on a punch 30 in a state of opening a press die and is pressed against the punch 30 by the elastic force of an elastic body 32 which compresses gradually the part 2 with the lowering of an upper holder 13. Next, the die 11 is further lowered by lowering the holder 13 thereby the part 2 is bent from a bending line (m) as shown by figure II to perform flanging through the whole periphery so as to form a part 3. In flanging a part B, on the other hand, a slide block 15 is raised, till it comes into contact with the plate 16 by the elasticity of a spring, to raise the die 11 apart from the processing position, and after several processing stages, a part (b) of a part 21 is dulled by the tip of a flange dulling die 41. |
