US 12,447,520 B2
Method for producing open-seam pipes
Mario Thome, Willich (DE); Regine Ahrem, Wuppertal (DE); and Jochen Vochsen, Erkelenz (DE)
Assigned to SMS group GmbH, Düsseldorf (DE)
Appl. No. 18/039,341
Filed by SMS group GmbH, Düsseldorf (DE)
PCT Filed Nov. 8, 2021, PCT No. PCT/EP2021/080968
§ 371(c)(1), (2) Date May 30, 2023,
PCT Pub. No. WO2022/117287, PCT Pub. Date Jun. 9, 2022.
Claims priority of application No. 10 2020 215 088.5 (DE), filed on Dec. 1, 2020.
Prior Publication US 2023/0415213 A1, Dec. 28, 2023
Int. Cl. B21D 5/01 (2006.01); B21C 37/08 (2006.01)
CPC B21D 5/015 (2013.01) [B21C 37/0815 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for producing an open-seam pipe (1) from a flat metal product (2) with a bending tool (3) and at least one externally located lower tool (4), the method comprising:
calculating, in advance, a plurality of positions of individual bending steps and an insertion depth of the bending tool (3);
bending the flat metal product (2) step-by-step to form the open-seam pipe (1) based on the advance calculation by bringing together two longitudinal edges (6a, 6b) of the flat metal product (2);
carrying out, after each of the individual bending steps, a target/actual comparison of a distance between the two longitudinal edges (6a, 6b) at at least one position arranged along a longitudinal extent of the flat metal product (2) and/or between one of the two longitudinal edges (6a) and an axial center line (7) of the flat metal product (2); and
determining, in an event of a deviation, a correction value for a subsequent bending step using a correction algorithm and adapting the insertion depth for the bending tool (3),
wherein at least one of the two longitudinal edges (6a, 6b) comprises at least three edge points (9a, 9b) on a basis of which the target/actual comparison of the distance is carried out, and
wherein the at least three edge points (9a, 9b) are spaced apart across a thickness of the at least one of the two longitudinal edges (6a, 6b).