Method for producing ultra thin wall metallic tube by cold...

Metal deforming – By use of roller or roller-like tool-element – With tool inside hollow work

Reexamination Certificate

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C072S370140, C072S370250

Reexamination Certificate

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07992417

ABSTRACT:
An aspect of the present invention provides a method for producing an ultra thin wall metallic tube by a cold rolling method with significant wall thickness reduction. In a method for producing the metallic tube with a cold pilger mill, a wall thickness is reduced to perform elongation while a wall thickness center diameter is expanded using a pair of rolls, which has a tapered groove die whose diameter is gradually expanded or reduced from an engaging inlet side of the roll toward a finishing outlet side thereof, and a tapered mandrel bar, whose diameter is gradually expanded from an engaging inlet side of the tapered mandrel bar toward a finishing outlet side thereof.

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International Search Report in corresponding PCT/JP2007/073468 issued i/Aug. 2008 (Japanese language).
Written Opinion in corresponding PCT/JP2007/073468 issued i/Aug. 2008 Japanese language.
Translation of International Preliminary Report on Patentability and Written Opinion for PCT/JP2007/073468, dated Aug. 10, 2010.

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