US 12,240,028 B2
Combination machine for folding and die bending a workpiece
Ralf Beger, Unterhaching (DE)
Assigned to Blech-Tec GmbH, (DE)
Appl. No. 17/430,519
Filed by Blech-Tec GmbH, Sauerlach/Altkirchen (DE)
PCT Filed Feb. 20, 2020, PCT No. PCT/EP2020/054445
§ 371(c)(1), (2) Date Aug. 12, 2021,
PCT Pub. No. WO2020/169716, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 10 2019 104 502.9 (DE), filed on Feb. 21, 2019.
Prior Publication US 2022/0314293 A1, Oct. 6, 2022
Int. Cl. B21D 5/02 (2006.01); B21D 5/00 (2006.01); B21D 5/04 (2006.01); B21D 21/00 (2006.01)
CPC B21D 5/0236 (2013.01) [B21D 5/004 (2013.01); B21D 5/042 (2013.01); B21D 21/00 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A combination machine for folding and die bending a workpiece, the machine comprising:
a lower tool holder configured to releasably receive at least one lower bending tool;
an upper tool holder configured to releasably receive at least one upper bending tool, and to be advanced in a straight line in an advancing direction toward the lower tool holder;
a pivotable tool holder configured to releasably receive at least one bending tool which is to be pivoted, the pivotable tool holder pivotable relative to the lower tool holder about a pivot axis running perpendicular to the advancing direction of the upper tool holder; and
a machine body on which the upper tool holder is arranged;
the machine body defining a parallelogram structure in cross-section, the parallelogram structure comprising a plurality of side elements positioned above the upper tool holder and aligned with the advancing direction of the upper tool holder, and respective upper and lower elements extending obliquely to the advancing direction of the upper tool holder;
such that the machine body is configured to absorb bending forces occurring in the advancing direction of the upper tool holder and bending forces occurring during a pivoting process of the pivotable tool holder, depending on the progress of the bending process.