Method of producing seamless pipes utilizing a plug rolling proc

Details Method of producing seamless pipes utilizing a plug rolling proc Method of producing seamless pipes utilizing a plug rolling proc

1993-04-16

1995-05-09

Larson, Lowell A.

Metal deforming

Process

Tube making or reshaping

72209, B21B 1706

Patent

active

054129745

ABSTRACT:
A method of producing seamless pipes by carrying out a plug rolling procedure includes expanding and stretching a hollow ingot into a bloom by carrying out at least two consecutive passes in a roll stand having a box-groove and by using a stationary plug supported by a rod. The bloom is pulled after each pass from the rod in a direction opposite the rolling direction. The bloom is turned after each pass by 90.degree. C. about a longitudinal axis thereof and the plug is exchanged after each pass. The method further includes the step of adjusting in one of the passes a wall thickness of the bloom in a wall portion of the bloom at the groove bottom by changing the roll distance in order to thin-stretching the wall portion such that the wall thickness of the finish-rolled bloom is uniform over the circumference thereof.

REFERENCES:
patent: 770195 (1904-09-01), Stiefel et al.
patent: 1858990 (1932-05-01), Foren
patent: 3911714 (1975-10-01), Kamimura et al.
patent: 4798071 (1989-01-01), Staat et al.

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