Title:
PRESS-MOLDING METHOD FOR VEHICLE EXTERIOR PANEL AND PRESS-MOLDING DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/065054
Kind Code:
A1
Abstract:
This press-molding method for a vehicle exterior panel is a method for press-molding a raw metal plate 51 into a vehicle exterior panel including a character line 63 and panel surface sections 65a, 65b by using a punch 3, a die 5, and a blank holder 7. The press-molding method includes: a step for providing an elastic body 9 protruding to the punch 3 side on a die-side molding surface section 5b for molding the panel surface section 65a, and bringing the elastic body 9 into contact with the raw metal plate 51 prior to the die 5 making contact with the metal plate; and a step for press-molding while press-crushing the elastic body 9 to press the raw metal plate 51. The elastic body 9 is made to protrude from the die-side molding surface section 5b such that a frictional force between the press-crushed elastic body 9 and the raw metal plate 51 is at or above an absolute value of a difference in tension generated on both sides of a site 53 that corresponds to the character line 63.
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Inventors:
KISHIGAMI YASUHIRO (JP)
Application Number:
PCT/JP2020/015855
Publication Date:
April 08, 2021
Filing Date:
April 08, 2020
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B21D24/00; B21D22/26; B21D24/04; B21D53/88; B60J5/00
Domestic Patent References:
| WO2019073614A1 | 2019-04-18 |
Foreign References:
| JP2018183786A | 2018-11-22 | |||
| JP2018103249A | 2018-07-05 | |||
| JP2017200708A | 2017-11-09 | |||
| JP2018158351A | 2018-10-11 | |||
| JP2007268608A | 2007-10-18 | |||
| JP5876786B2 | 2016-03-02 | |||
| JP2015199102A | 2015-11-12 | |||
| JPS6358652A | 1988-03-14 | |||
| JP5959702B1 | 2016-08-02 | |||
| JP2018158351A | 2018-10-11 | |||
| JP2018183786A | 2018-11-22 |
Other References:
"The Japan Sheet Metal Forming Research Group, Press Forming Difficulty Handbook", 2017, NIKKAN KOGYO SHIMBUN, LTD., article "Chapter 5 Poor Surface Shape Accuracy and Evaluation for Forming Difficulty", pages: 218 - 221
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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