Open-loop control method for suppressing shape waves in wide, thin, medium and heavy plate rolling

Abstract

The invention is a kind of open loop control method for restraining shape wave when rolling wide and thin middle-thick board, the steps are: according to the material size and product size, allocates down pressed degree of each pass, and calculates the rolling force, temperature, thickness rate and tolerance flatness change of each pass; if the outlet thickness of the current pass is bigger than 30mm, then uses AGC method to adjust and control automatically; if the thickness is smaller than 30mm, analyzes the affect of rolling force fluctuation to flatness, if the affect exceeds the tolerance range and has little affect to thickness, then changes the AGC method into APC method (automatic position control), otherwise uses AGC method to control; the invention reduces the disturbance of AGC system to board shape, at the same time, it doesn't affect the thickness control, upgrades the stability of rolling process.

Description

technical field [0001] The invention belongs to the technical field of rolling, in particular to an open-loop control method for suppressing wave shapes when rolling wide, thin, and medium-thick plates. Background technique [0002] At present, most domestic medium and heavy plate manufacturers install AGC (automatic thickness control) equipment on the rolling mill, but do not install shape control equipment, so the shape of the steel plate can only be controlled in an open-loop manner. The conventional open-loop adjustment method is to dynamically change the rolling schedule. This method requires continuous manual intervention and cannot be adjusted on-line according to the change of rolling force in real time during the rolling process. Especially for some rolling mills with low longitudinal stiffness, if rolling wide, thin and medium plates, the rolling force fluctuation caused by AGC is relatively large, which is very easy to cause wave shape. In this case, it is impossi...

AI Technical Summary

Problems solved by technology

The conventional open-loop adjustment method is to dynamically change the rolling schedule. This method requires continuous manual intervention and cannot be adjusted online in real time according to the change of rolling force during the rolling process.

Especially for some rolling mills with low longitudinal stiffness, if rolling wide, thin and medium-thick plates, the rolling force fluctuation caused by AGC is relatively large, which is very easy to cause waves. In this case, it is impossible to adjust the plate shape by dynamically changing the rolling schedule

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