US 12,479,018 B2
Workpiece processing method and processing device
Takeshi Yamada, Tokyo (JP); Akira Kono, Tokyo (JP); Atsushi Sugai, Tokyo (JP); Yu Matsunaga, Tokyo (JP); Takeshi Hoshino, Tokyo (JP); Shota Hosoi, Tokyo (JP); Suguru Kondo, Tokyo (JP); and Satoshi Kamata, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Toyko (JP)
Appl. No. 16/962,725
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Mar. 26, 2019, PCT No. PCT/JP2019/012809
§ 371(c)(1), (2) Date Jul. 16, 2020,
PCT Pub. No. WO2019/189149, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-062005 (JP), filed on Mar. 28, 2018.
Prior Publication US 2020/0353522 A1, Nov. 12, 2020
Int. Cl. B21D 5/08 (2006.01); B21D 7/08 (2006.01); C22F 1/04 (2006.01)
CPC B21D 5/08 (2013.01) [B21D 7/08 (2013.01); C22F 1/04 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A workpiece processing method comprising:
a first forming step of performing forming to impart a predetermined cross-sectional shape to a flat plate-shaped workpiece and obtaining a long workpiece;
a solution heat treatment step of performing solution heat treatment on the long workpiece after the first forming step has been performed;
a second forming step of performing forming to bend the long workpiece into an arcuate shape such that a longitudinal direction of the long workpiece describes an arc on the long workpiece after the solution heat treatment step has been performed; and
a third forming step of performing, on the long workpiece after the second forming step has been performed, forming to impart a curved shape to the long workpiece by bringing the long workpiece into contact with a curved surface of a die, and pulling the long workpiece by gripping both ends of the long workpiece, thereby inputting a tensile load in a tangential direction to the curved surface of the die to the long workpiece.