Method and apparatus for bulge forming and bending tubes
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United States of America Patent
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Oct 20, 1998
Grant Date -
N/A
app pub date -
Nov 20, 1996
filing date -
Nov 20, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is provided a device and manner for bulge forming and bending a tube or hollow extrusion, such as a pipe or conduit. The one portion of the length of the tube is bulge-formed to define a radially expanded, contoured section of the tube, while another portion of the tube length is bent to define an angle or curve in the tube. The device employs a radially expandable mandrel which serves both as the expandable member for bulge-forming the tube, as well as a bending mandrel to stabilize the tube against wrinkling or collapse during bending.
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