Process for forming tube-shaped hollow bodies made of metal
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United States of America Patent
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Dec 7, 2004
Grant Date -
Jun 20, 2002
app pub date -
Aug 28, 2001
filing date -
Aug 29, 2000
priority date (Note) -
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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.
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