Device for producing a longitudinally welded hollow profile using a holding-down device

US7909226B2 · kind B2 · utility

Assignee

• Thyssenkrupp Steel AG · DE

Inventors

• Michael Brüggenbrock · Rosendahl, DE
• Thomas Flehmig · Ratingen, DE
• Wladimir Rituper · Duisburg, DE
• Mohamed Tohfa · Duisburg, DE

Key dates

• Filing date: Sep 8, 2005
• Grant date: Mar 22, 2011
• Expiry date: Sep 8, 2025

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B21C37/0815
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A method for producing a longitudinally welded hollow profile from a sheet metal blank having defined longitudinal edges, in which the sheet metal blank is initially preformed into an open seam profile with the aid of at least two tool parts allows for the economical production of accurately formed hollow profiles. This is achieved in that to produce the open seam profile, the sheet metal blank, by a change in the relative position of the tools parts, is placed freely around a mandrel positioned between the tool parts and extending in the longitudinal direction of the sheet metal blank, the outer shape of which mandrel determines the inner shape of the hollow profile to be produced, and in that the shaping of the open seam profile obtained is then completed in one or more stages in each case by a further change of the relative position of the tool parts.