Method for expanding a tubular blank

Details Method for expanding a tubular blank Method for expanding a tubular blank

2006-03-21

2006-03-21

Banks, Derris H. (Department: 3725)

Metal deforming

Process

Tube making or reshaping

C072S370220, C072S370100, C072S318000, C072S306000, C072S061000, C072S062000, C072S059000, C072S058000

Reexamination Certificate

active

07013697

ABSTRACT:
A method for expanding tubular blanks includes pre-expanding or initially expanding a section of the tube by forcing a punch into an open end of the tube. The punching process may be repeated to achieve up to approximately 50% expansion from the original configuration of the blank. Then, the same pre-expanded section can be further expanded by hydroforming such that the blank is filled with pressurized fluid to achieve further expansion of the initially expanded section up to approximately 100% expansion from the original configuration of the blank. As a final step, the open end of the expanded tube may be cut to its ultimate shape.

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patent: 0 372 360 (1990-06-01), None
patent: 0 982 087 (2000-03-01), None
patent: 1 184 101 (2002-03-01), None

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