Apparatus for expansion forming of tubing forming of tubing

Details Apparatus for expansion forming of tubing forming of tubing Apparatus for expansion forming of tubing forming of tubing

1997-02-28

1998-10-06

Vo, Peter

Metal working

Plural diverse manufacturing apparatus including means for...

Binding or covering and cutting

29 33T, 294211, 72 58, 72 62, B23P 1702, B21D 3908

Patent

active

058159010

ABSTRACT:
A frame member of rectangular cross section with rounded corners is formed by expansion of a tubular blank within a die cavity having an inner portion of corresponding cross section and an outer transition portion which is of smoothly continuously curved cross sectional profile elongated substantially parallel to the larger dimension of the rectangular section. An outer portion of the tubular blank is deformed to correspond with the continuously curved cross sectional profile and is sealed by a resiliently compressible sealing element of corresponding profile through which fluid pressure is applied in order to expand the blank. By matching the profile of the transition portion to the rectangular inner portion, the transition portion can be made shorter and considerable savings of materials and resources can be achieved.

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