Making seamless pipes, over 200 mm in diameter

Details Making seamless pipes, over 200 mm in diameter Making seamless pipes, over 200 mm in diameter

1988-03-24

1989-07-18

Larson, Lowell A.

Metal deforming

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

During rotation of work

B21B 1904

Patent

active

048481246

ABSTRACT:
Seamless tubing and pipes are made from solid rounds with a diameter not exceeding 0.8 of the diameter of the tubing or pipe to be made; the method includes the steps of piercing the solid with a mandrel such that a conical widening angle at the end of piercing has a particular value; a smoothing step is provided downstream from the piercing also with a particular cone angle; and between the piercing and the smoothing of the now pierced hollow is widened under reduction of the wall thickness at a conical angle of widening that is larger (blunter) than the widening angle of piercing and the particular cone angle.

REFERENCES:
patent: 1994713 (1935-03-01), Jackson
patent: 2025148 (1935-12-01), Bannister

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