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US 10,946,431 B2Granted
Method for shear processing
AssigneeNippon Steel Corporation
InventorsTakashi Yasutomi, Masahiro Saito, Shigeru Yonemura, Tohru Yoshida
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AssigneeNippon Steel Corporation
InventorsTakashi Yasutomi, Masahiro Saito, Shigeru Yonemura, Tohru Yoshida
Estimating the term…
The present invention provides a method for shear processing whereby a sheared surface having a small residual stress and excellent surface properties is formed and the service life of a punch is prolonged in a shear processing for shearing, by a shear line that crosses a weld zone, a workpiece with a large thickness of level difference of a weld zone and/or obtained by welding together a steel sheet having a strength of 1000 MPa or more and another steel sheet. The shearing for shear processing method according to the present invention is a method for shearing a workpiece having a weld zone using a punch and a die, the method characterized in that two protrusions are provided to a cutting edge of the punch, all or part of the weld zone of the workpiece is flanked from the two sides by the two protrusions, and the workpiece is sheared by a shear line that crosses the weld zone.
A method for shear processing to shear a workpiece so as to cross a weld zone of the workpiece by using a shear processing device comprising a die, a stopper, and a punch, the workpiece obtained by welding two metal sheets, wherein the punch has two protrusions at a cutting edge of the punch,
Dependencies are inferred from the claim text.