Piercing-rolling method and piercing-rolling apparatus for...

Details Piercing-rolling method and piercing-rolling apparatus for... Piercing-rolling method and piercing-rolling apparatus for...

2008-06-06

2009-08-25

Tolan, Edward (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

C072S366200

Reexamination Certificate

active

07578157

ABSTRACT:
To provide a method and apparatus for seamless tubes in which the occurrence of material peeling can be prevented even when the skew angle δ and tube expansion ratio are increased.A piercing-rolling method for seamless tubes using a piercer, which is provided with a pair of cone-shaped main rolls and a pair of disk rolls, each pair being arranged in an opposing manner with a pass line therebetween as a center axis, and a plug whose center axis coincides with the pass line, wherein a billet to be pierced and rolled is advanced while being spirally rotated by a drive rotation of the main rolls; the method of which is characterized in each of the disk rolls being arranged in an inclined state at a fixed skew angle δ to the pass line.

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