PRESS-FORMING METHOD AND PRESS-FORMING DEVICE

WIPO Patent Application WO/2012/039399

A1

Provided is a press-forming method comprising: a step in which a workpiece (W) is pressed by a punch (20) having a forming recess (66) in a side wall, and is inserted together with the punch (20) into a cavity (14) in a die (16) while a first pressure force is applied to a pressure fluid (L) introduced in advance into the cavity (14); a step in which the distal area of the workpiece (W) is formed into a shape that follows the shape of the distal part of the punch (20) and the bottom part of the die (16) by causing the punch (20) to reach the lowermost point thereof; and a step in which a lateral area of the workpiece (W) is formed into a shape that follows the shape of the forming recess (66) by applying a second pressure force greater than the first pressure force to the pressure fluid (L) after the punch (20) has reached the lowermost point, and pressing on the lateral area of the workpiece (W) in the direction from the die (16) toward the forming recess (66) of the punch (20).

JP5883351	Hot press molded product, its manufacturing method and thin steel plate for hot press molding
JP3775337	HIGH FORMABILITY, HIGH TENSILE STRENGTH, HOT ROLLED STEEL SHEET HAVING EXCELLENT MATERIAL UNIFORMITY, PRODUCTION METHOD THEREFOR AND WORKING METHOD THEREFOR

KOSHIMIZU TOSHIMASA
NISHIDA MASAYASU
HASHIMOTO KEN

PCT/JP2011/071384

March 29, 2012

September 20, 2011

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HONDA MOTOR CO LTD (JP)
KOSHIMIZU TOSHIMASA
NISHIDA MASAYASU
HASHIMOTO KEN

B21D22/20; B21D26/023; B21D26/027; B21D26/031

JPH0847727A	1996-02-20
JPH01135125U	1989-09-14
JPS63149023A	1988-06-21
JPH05285552A	1993-11-02
JPS6042411U	1985-03-26
JPH01135126U	1989-09-14
JPH01317627A	1989-12-22

MOTOYAMA Shinya et al. (JP)
Shinya Motoyama (JP)

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