Method of producing ultra thin wall metallic tube by cold drawing process
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United States of America Patent
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Sep 7, 2010
Grant Date -
Aug 6, 2009
app pub date -
Oct 21, 2008
filing date -
Feb 1, 2008
priority date (Note) -
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Abstract
In a method of producing an ultra thin wall metallic tube by a cold drawing process in which a drawing machine is used, a wall thickness of the metallic tube is reduced to perform drawing while a tube-wall centerline diameter of a tube material is expanded, using a solid die which gradually increases in diameter from its engaging inlet side toward its work-ending outlet side and a plug or a tapered mandrel bar which gradually increases in diameter over a corresponding distance from the engaging inlet side of the solid die toward the work-ending outlet side of the solid die, whereby the wall thickness can dramatically be reduced.
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