Title:
DEEP DRAWING METHOD
Document Type and Number:
WIPO Patent Application WO/2021/002148
Kind Code:
A1
Abstract:
The present invention includes: a first step for circumferentially clamping a sheet material (1) by means of a clamping part C of a die D such that the maximum elongation of the sheet material (1) is less than 200%; and a second step for using a gas pressure difference to deep draw the sheet material (1) that was clamped in the first step into a deep-drawing space S that is on one surface side of the sheet material (1). In the first step, an upper clamping die D1 that has, between the clamping part C and the deep-drawing space S, an R part CP that has a curved surface or an almost curved surface that has a polygonal shape that is formed from a plurality of flat surfaces is used on the one surface side of the sheet material (1). During the deep drawing of the second step, a circumferential end part of the sheet material (1) is drawn from the clamping part C to the deep-drawing space S side along the R part CP.
Inventors:
NAKAMURA TAKUJU (JP)
Application Number:
PCT/JP2020/022420
Publication Date:
January 07, 2021
Filing Date:
June 05, 2020
Export Citation:
Assignee:
YAZAKI ENERGY SYSTEM CORP (JP)
International Classes:
B21D26/021; B21D26/033; B21D26/059
Foreign References:
| JPH11503074A | 1999-03-23 | |||
| JP2006026648A | 2006-02-02 | |||
| JP2010046673A | 2010-03-04 | |||
| JP2010247172A | 2010-11-04 | |||
| JP2001259752A | 2001-09-25 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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