Title:
【発明の名称】対向液圧プレス成形法
Document Type and Number:
Japanese Patent JP2732786
Kind Code:
B2
Abstract:
PURPOSE:To increase the compression force to be applied to the circumferential edge part of a punch in a blank even when the axial compression force to be applied to the punch is small because the hydrostatic pressure higher than the hydrostatic pressure to be generated in the punch side hydrostatic pressure chamber is generated in the flange side hydrostatic pressure chamber. CONSTITUTION:In executing the deep drawing by pushing the blank A to be held on the surface of a die body 1 through a blank holder 4 into a hydrostatic pressure chamber 2 formed in the die body 1 by using a punch 3, the prescribed part of the hydrostatic pressure chamber in the outer circumferential wall part of the punch of the blank A is sealed by a seal material 5 when the blank A is pushed into the hydrostatic pressure chamber 2. The hydrostatic pressure higher than the hydrostatic pressure to be generated in the punch side hydrostatic pressure chamber 2c close to the punch tip is generated in the flange side hydrostatic pressure chamber 2b closer to the flange than to this sealed part.
Inventors:
MATSUMOTO JUJI
SAKAI YOSHIHITO
KISHIDA HIROSHI
SAKAI YOSHIHITO
KISHIDA HIROSHI
Application Number:
JP24021293A
Publication Date:
March 30, 1998
Filing Date:
September 28, 1993
Export Citation:
Assignee:
HITACHI ZOSEN KK
International Classes:
B21D22/20; B21D24/00; (IPC1-7): B21D22/20
Domestic Patent References:
| JP58181431A | ||||
| JP5592424U |
Attorney, Agent or Firm:
Yoshihiro Morimoto