Method of piercing and manufacturing seamless tubes

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

1988-03-25

1989-05-09

Larson, Lowell A.

Metal deforming

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

During rotation of work

B21B 1904

Patent

active

048277509

ABSTRACT:
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,

REFERENCES:
patent: 2017388 (1935-10-01), Bannister
patent: 3719066 (1973-03-01), Okamoto et al.
patent: 4470282 (1984-09-01), Hayashi
Copy of French Search Report.
Steel in the USSR, vol. 7, No. 11, Nov. 1977, pp. 627-632; P. I. Polukhin et al., "Development of Processes for Plastic Deformation of Metals".
Patent Abstracts of Japan, vol. 11, No. 94 (M-574) [2541], Mar. 25, 1987; JP-A-61 245 906 (Sumitomo Metal Ind. Ltd.) 1/11/86.

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