Dynamic specification-changing moving method for working rollers of cold continuous mill

Abstract

The invention discloses a dynamic specification-changing moving method for working rollers of a cold continuous mill. When the length L<weld> between a weld of a current roll of strip steel and the next roll of strip steel and a first rack is equal to t<WS>(1).V<0>, the working roller of the first rack starts to move from the current position to the set moving position of the working roller of the next roll of strip steel. When the length L<weld> between the weld of the current roll of strip steel and the next roll of strip steel and the first rack is equal to [t<WS>(2).V<1>-L<12>]H<1> / H<0>, the working roller of a second rack starts to move from the current position to the set moving position of the working roller of the next roll of strip steel. When the length L<weld> between the weld of the current roll of strip steel and the next roll of strip steel and the first rack is equal to [t<WS>(3).V<2>-L<13>]H<2> / H<0>, the working roller of a third rack starts to move from the current position to the set moving position of the working roller of the next roll of strip steel. By means of the dynamic specification-changing moving method, the control precision for thinning of edges of the head and tail of the strip steel can be guaranteed, and the strip steel is prevented from being broken in the positions of welds.

Description

technical field [0001] The invention relates to a method for dynamically changing specification movement of work rolls of a cold tandem rolling mill, which belongs to the field of rolling control. Background technique [0002] The continuous cold rolling production is an endless continuous rolling mode. In order to meet the needs of customers with different product specifications, product specifications are often changed, resulting in different width, steel type and thickness of the current rolling strip and the next coil. Two adjacent coils of strip steel are welded together by a laser welding machine, and a weld seam is formed between the two coils of strip steel. For ordinary four-high rolling mills and six-high rolling mills, since the work rolls are axially fixed, the width, steel type, thickness and other specifications of two adjacent coils of strip can be changed by dynamically adjusting the roll gap, speed and tension when changing specifications. To ensure the sta...

AI Technical Summary

Problems solved by technology

The usual method is that the work roll starts to move when the weld seam is 10 meters away from the roll seam of the first stand, which is affected by the work roll movement speed, the change of the entrance strip speed, the rolling speed of each stand, the rolling force of each stand, etc. Due to the influence of various factors, it is impossible to ensure that the work roll has shifted to the set position of the work roll shift of the next roll of strip before the weld seam enters the roll gap, and thus the control accuracy of the strip edge thinning at the head and tail cannot be guaranteed.

At the same time, when the width specification of the strip steel changes from small to large, if the work roll fails to move to the set position of the next strip before the weld seam enters the roll gap, the strip will break at the weld seam

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