Method for producing open-seam pipes from sheet metal panels

Patent metadata

Field	Value
Publication number	US-2018169727-A1
Application number	US-201615579036-A
Country	US
Kind code	A1
Filing date	Jun 2, 2016
Priority date	Jun 3, 2015
Publication date	Jun 21, 2018
Grant date	—

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, in which 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 the pilgering process.

First claim

1 - 3 . (canceled)

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

5 . The method according to claim 4 , wherein for carrying out the second bending step, which follows the first bending step performed in the second bending section, for reshaping of the first bending section, the sheet metal panel is retracted laterally and initially positioned at a steep angle between the lower tools with support of the bending edge on one of the supporting elements.

6 . The method according to claim 4 , wherein at least in one bending step, once on the left side and once on the right side in relation to the predetermined middle of the upper tool punching from the longitudinal axis into the progressively formed sheet metal panel, a lesser shaping is performed in comparison to the other bending steps and that, in conclusion, through application of a pressing force acting on this non-round perform, in each case specifically in the lesser shaped regions previously formed on both sides of the middle, the finished open-seam pipe is shaped.

Assignees

• Sms Group Gmbh

Inventors

• Thome Mario
• Kolbe Manfred
• Feldmann Uwe
• Vochsen Jochen

Classifications

• B21D5/015 Primary

  for making tubes · CPC title

• B21D5/02

  on press brakes without making use of clamping means · CPC title

• B21D5/01 Primary

  between rams and anvils or abutments · CPC title

• B21D5/10

  for making tubes · CPC title