Metal deforming – Process – Tube making or reshaping
Reexamination Certificate
2001-08-28
2004-12-07
Larson, Lowell A. (Department: 3725)
Metal deforming
Process
Tube making or reshaping
C072S370220
Reexamination Certificate
active
06826943
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns a process for forming tube-shaped hollow bodies made of metal, particularly made of aluminum, with, after shaping of a slab-shaped semifinished product into a closed cross-sectional profile, and straight seam welding of the opposite edges of the semifinished product, the tube-shaped hollow body formed being soft annealed and finally hydroformed in a die by a medium introduced into the hollow body.
Forming tube-shaped hollow bodies made out of metal by soft annealing the hollow body, further processing it depending on the requirements of the final shape sought, and finally hydroforming it in a die through a medium introduced into the hollow body is known.
Because the material solidifies during hydroforming as the forming progresses, and therefore resists further shaping or even cracks, in practice, changes of only up to approximately 10% of the cross-section relative to the initial cross-section are possible during one cycle of hydroforming.
BRIEF SUMMARY OF THE INVENTION
The object of the invention is to allow greater alterations of the cross-section.
This object is achieved in a process for forming tube-shaped hollow bodies made of metal, particularly made of aluminum.
Further developments and advantageous embodiments arise from the sub-claims.
REFERENCES:
patent: 1980264 (1934-11-01), Giesler
patent: 3247581 (1966-04-01), Pellizzari
patent: 3852987 (1974-12-01), Price et al.
patent: 5960660 (1999-10-01), Klaas et al.
patent: 6260401 (2001-07-01), Tada
patent: 0 372 360 (1990-06-01), None
patent: 0 548 859 (1993-06-01), None
patent: 1 175 592 (1985-08-01), None
Rempe Wolfgang
Steimmel Franz
Wähner Frank
Hydro Alumunium Deutschland GmbH
Larson Lowell A.
Proskauer Rose LLP
LandOfFree
Process for forming tube-shaped hollow bodies made of metal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for forming tube-shaped hollow bodies made of metal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for forming tube-shaped hollow bodies made of metal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3279877