US 12,076,776 B2
Press brake and method of operating press brake
Hideki Okada, Kobe (JP); Hiroki Oribe, Kobe (JP); Hitoshi Yano, Kobe (JP); Kristof Tyvaert, Gullegem (BE); and Alexander Cornelus, Gullegem (BE)
Assigned to KAWASAKI JUKOGYO KABUSHIKI KAISHA, Kobe (JP); and LVD COMPANY NV, Gullegem (BE)
Filed by Kawasaki Jukogyo Kabushiki Kaisha, Kobe (JP); and LVD Company nv, Gullegem (BE)
Filed on Dec. 28, 2021, as Appl. No. 17/563,087.
Application 17/563,087 is a continuation of application No. PCT/JP2020/025402, filed on Jun. 26, 2020.
Claims priority of application No. 2019-122092 (JP), filed on Jun. 28, 2019.
Prior Publication US 2022/0118495 A1, Apr. 21, 2022
Int. Cl. B21D 5/02 (2006.01)
CPC B21D 5/0209 (2013.01) [B21D 5/0272 (2013.01); B21D 5/0281 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A press brake that performs bending with respect to a workpiece by a die and a punch,
the press brake comprising:
a die including a pair of shoulder portions and a groove portion located between the pair of shoulder portions, the pair of shoulder portions being arranged away from each other in a conveying direction of a workpiece and supporting a rear surface of the workpiece;
a backup plate that extends on the pair of shoulder portions, covers the groove portion, and is interposed between the die and the workpiece; and
a punch that moves relative to the die and presses the workpiece within an elastic deformation region of the backup plate to bend the workpiece,
wherein the backup plate includes a laminated structure in which plates are stacked on each other, and among the plates included in the backup plate, an outer-surface plate that is a plate located closest to the punch includes a curved portion that both edge portions of the outer-surface plate in the conveying direction of the workpiece curve in a direction away from the punch, and both edge portions extend past all of the plates of the backup plate, and
the curved portion covers edge portions of the plates in the conveying direction.