Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
クッションピン
Document Type and Number:
Japanese Patent JP4136617
Kind Code:
B2
Abstract:

To provide a pressure equalizing cushion pin for die cushions which does not necessitate a large-scale hydraulic circuit for equalizing the pressure of the cushion and is constituted at a low cost, a die cushion using the same, a press using the same and press-forming method by equalizing the pressure of the cushion pin.

In the cushion pin which is threaded through the bolster (54) of the press, the lower end of which is provided on the die cushion (59) through a die cushion pad (60) and the top end of which holds a work directly or through a blank holder (56), this cushion pin is provided with an elastic member (6) for generating energizing force in the axial direction and enables the hold of the work with this elastic member (6). The press forming is performed by absorbing the variation in the position of the end part of the cushion pin (1) by the contraction of the elastic member (6) provided on each of a plurality of cushion pins (1) and equalizing the transfer pressure in the axial direction of each cushion pin (1).

COPYRIGHT: (C)2004,JPO


Inventors:
Kiyotsugu Aoshima
Application Number:
JP2002331262A
Publication Date:
August 20, 2008
Filing Date:
November 14, 2002
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
KOMATSU LTD.
International Classes:
B21D24/02; B30B15/02
Domestic Patent References:
JP6078000U
JP10166191A
JP61027519U
Attorney, Agent or Firm:
Tsutomu Inoue