Patent · US Expired

Process for forming tube-shaped hollow bodies made of metal

US6826943B2 · kind B2 · utility

7Cited by

5References

8Claims

0Family size

Assignee

Hydro Aluminium Deutschland GmbH · DE

Inventors

Wolfgang Rempe · Hannover, DE
Franz Steimmel · Wennigsen (Deister), DE
Frank Wahner · Hannover, DE

Key dates

Filing date	Aug 28, 2001
Grant date	Dec 7, 2004
Priority date	—
Expiry date	Aug 28, 2021

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB21D41/02
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A process for forming tube-shaped hollow bodies made of metal, particularly made of aluminum, is described. After forming a slab-shaped semifinished product into a closed cross-sectional profile and straight seam welding the opposing edges of the semifinished product, the tube-shaped hollow body is first mechanically partially expanded and/or mechanically partially reduced in an upstream processing phase. It is then soft annealed and finally hydroformed in a die by a medium introduced into the hollow body.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.