Method of piercing and manufacturing seamless tubes

Details Method of piercing and manufacturing seamless tubes Method of piercing and manufacturing seamless tubes

B - Operations, Transporting

21

B

8/52

B21B 19/04 (2006.01)

Patent

CA 1296553

ABSTRACT OF THE DISCLOSURE In a method of manufacturing seamless tubes according to the present invention, piercing from a solid billet can be accomplished through one pass by means of a piercing mill ao the present invention, piercing from a solid billet can be accomplished through one pass by means of a Piercing mill at the piercing ratio above 4.0 or the expansion ratio above 1.15, or the wall thickness/outside diameter ratio below 6.5%, and the piercing mill having cone-shaped rolls is used with its feed angle .beta. and cross angle .gamma. satisfying the following relations, 8° ? .beta. ? 20° 5° ? .gamma. ? 35° 15° ? .beta.+.gamma. ? 50° and the solid billet diameter do, outside diameter d and wall thickness t of a hollow shell after piercing satisfying a prescribed condition for realization, thereby manufac- turing equipments can be largely simplified.

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