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Title:
SKEW ELONGATING ROLLING METHOD
Document Type and Number:
Japanese Patent JPH03165903
Kind Code:
A
Abstract:

PURPOSE: To manufacture a tubing with the wall thickness and outside diameter of high accuracy in high yield by accelerating controlling the moving speed of mandrel bar in the rolling direction when the rear end part of tubing is rolled.

CONSTITUTION: A hollow shell H is skew elongating rolled with a skew main roll 2 and it is worked into a blank pipe H'. The rear end part of the hollow shell H is detected during working and the speed of the mandrel bar 5 is controlled with a control arithmetic unit 13 at a prescribed timing and a motor M is increased its speed. In the rear end part of the hollow shell H, rolling load is reduced as keeping at the same speed and the wall thickness of the blank pipe H' is thinned, but it is prevented by acceleration controlling. The speed of the mandrel bar 5 is made in a slower speed than the speed of the inlet except the rear part of the hollow shell H and the rear part is set at a faster speed than the speed at the inlet. The crop quantity of the rear part of tubing can be reduced and the tubing with the wall thickness and outside diameter of high accuracy can be manufactured in high yield.


Inventors:
Urayama, Takeshi
Application Number:
JP1989000270056
Publication Date:
July 17, 1991
Filing Date:
October 16, 1989
Export Citation:
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Assignee:
SUMITOMO METAL IND LTD
International Classes:
B21B19/06; (IPC1-7): B21B19/06



 
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