Method and apparatus for working tube
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United States of America Patent
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May 12, 2009
Grant Date -
Jan 20, 2005
app pub date -
Jul 17, 2003
filing date -
Jul 17, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
After insertion of a mandrel (23) into a blank tube (20) in the form of an electric welded tube, a parallel swaging operation is carried out by moving a cylindrical die (24) to cause the end of the blank tube (20) to contact tightly with a parallel forming portion (27) of the mandrel (23). After completion of parallel swaging operation, the die (24) is withdrawn out of the blank tube (20) and a push-die (33) is caused to move to the blank tube (20) from a radially outward position while leaving the mandrel (23) inside the blank tube (20) so that a weld bead on the blank tube (20) can be flattened by cooperation with the mandrel (23).
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