公开(公告)号：US11097326B2

公开(公告)日：2021-08-24

申请号：US15579036

申请日：2016-06-02

Applicant: SMS group GmbH

Inventor： Mario Thome ,  Manfred Kolbe ,  Uwe Feldmann ,  Jochen Vochsen

IPC: B21D5/01 ,  B21D5/10 ,  B21D5/02

Abstract: A method for producing open-seam pipes from sheet metal panels, in particular thick sheet metal panels. A sheet metal panel, having bending edges on the long sides thereof, is fed to a pipe forming press where the sheet metal panel is formed, lying on a lower tool having of two supporting elements which are horizontally spaced apart from each other, by an upper tool, which can be raised and lowered, by application of a bending force, progressively into an open-seam pipe having bending edges on opposite long sides with a gap for later longitudinal seam welding. In order that the sheet metal panel can be easily, progressively formed or shaped from the start, at least the bending sections immediately adjacent on the bending edges of the sheet metal panel are each formed from the outside to the inside, deviating from a numerically ascending bending step sequence in a pilgering process sequence.