| 摘要 |
PURPOSE:To offer a drawing method and a device of low running cost by eliminating the need for a coinning, etc., of the case of a complicated shape by abutting a punch, a sealing die inside a liquid pressure dome and a work by adhering them annularly and impressing a liquid pressure in order to plural liquid pressure zones. CONSTITUTION:A work 1 is clamped by an upper clamp holder 12 at the lower part of an outer table and a lower blank holder 10 of the upper place of a liquid pressure dome 4. When a punch 14 is autted to the work by a control device 26 and its descent is further continued, an annular liquid pressure zone is formed between the liquid pressure zone 17 at the inside of a sealing die 9 and the outside liquid pressure dome 4. A specific pressure is impressed on the inside liquid pressure zone 17 from a port 19 and after drawing with liquid pressure, the specific pressure is impressed on the outside liquid pressure zone 18 from a liquid pressure impressing passage 21 to perform the liquid pressure forming of the overhang part of the outside. With this device a complicated local coinning die, etc., are eliminated the need and the running cost can be reduced.
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