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Title:
METHOD AND APPARATUS FOR DRAWING METALLIC TUBE
Document Type and Number:
Japanese Patent JPH03151104
Kind Code:
A
Abstract:

PURPOSE: To improve the productivity and to reduce the product cost without making a defect such as a crack on a product tube by determining a proper range of a quantity of state regarding the rolled state of a metallic tube and changing the advancing speed or rotating speed when the rolling advances beyond its range.

CONSTITUTION: The quantity of state regarding the rolled state is detected and when this detected result exceeds a preset upper limit value by a build-up made on a tube A being a rolling object, the advancing speed per rotation of the tube A is reduced by the increase of the advancing speed of the tube A or the speed of rotation of rolling rolls 1, 2, 3 before a defect such as a crack caused by the build-up in generated on the product tube. Further, when the disappearance of such build-up is recognized by the fact that a detected result exceeds the lower limit value set within a specified proper scope or converges to a fixed value within the scope, the amount of advance per rotation of the tube is returned to a high level by the increase of the advancing speed of the tube A or the decrease of the speeds of rotation of the rolling rolls 1, 2, 3, consequently, a crack, etc., are not generated and rolling can be performed at a speed as high as possible.


Inventors:
Nagase, Yutaka
Application Number:
JP1989000288527
Publication Date:
June 27, 1991
Filing Date:
November 06, 1989
Export Citation:
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Assignee:
SUMITOMO METAL IND LTD
International Classes:
B21B19/06; B21B37/78; (IPC1-7): B21B19/06



 
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