Metal deforming – By use of roller or roller-like tool-element – With tool inside hollow work
Reexamination Certificate
2011-08-09
2011-08-09
Tolan, Edward (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
With tool inside hollow work
C072S370140, C072S370250
Reexamination Certificate
active
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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Marshall & Gerstein & Borun LLP
Sumitomo Metal Industries Ltd.
Tolan Edward
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