US 11,938,577 B2
Method and device for cutting a workpiece
Thomas Flehmig, Ratingen (DE)
Assigned to ThyssenKrupp Steel Europe AG, Duisburg (DE); and Thyssenkrupp AG, Essen (DE)
Appl. No. 17/055,670
Filed by ThyssenKrupp Steel Europe AG, Duisburg (DE); and thyssenkrupp AG, Essen (DE)
PCT Filed Apr. 16, 2019, PCT No. PCT/EP2019/059785
§ 371(c)(1), (2) Date Mar. 22, 2021,
PCT Pub. No. WO2019/219315, PCT Pub. Date Nov. 21, 2019.
Claims priority of application No. 10 2018 112 056.7 (DE), filed on May 18, 2018.
Prior Publication US 2023/0182244 A1, Jun. 15, 2023
Int. Cl. B21D 28/02 (2006.01); B23D 35/00 (2006.01); B23P 23/04 (2006.01)
CPC B23P 23/04 (2013.01) [B21D 28/02 (2013.01); B23D 35/001 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for cutting a workpiece comprising one of a blank and a component, the method comprising the following steps:
inserting the workpiece into a cutting device, the cutting device comprising (i) a first tool half having a workpiece holder and at least one first cutting means, which comprises a first cutting edge and a first cutting means contact surface, and (ii) a second tool half having at least one second cutting means having a second cutting edge and a second cutting means contact surface, the second cutting means contact surface having a planar region that transitions to an inclined region near the second cutting edge,
clamping the workpiece with the workpiece holder wherein a pressing force between the workpiece holder and the second cutting means causes the workpiece to undergo a first upward prebending at the inclined region;
advancing the first cutting means downward while the workpiece holder remains applied to the workpiece wherein the first cutting means initially impinges the workpiece with the first cutting means contact surface which leads in relation to the first cutting edge and bends the workpiece downward through further downward movement of the first cutting means causing the workpiece to have a second downward prebending, wherein the first and second prebending of the workpiece occur prior to contact of the first and second cutting edges with the workpiece; and
further advancing the first cutting means downward wherein the first and second cutting edges impinge the workpiece and apply a shear stress thereto producing material separation of the workpiece.