On-line coordination control method for plate shape and plate thickness of strip tandem hot continuous rolling mill

Abstract

The invention discloses an on-line coordination control method for the plate shape and plate thickness of a strip tandem hot continuous rolling mill, belonging to the technical filed of hot continuous rolling of sheets and strips. The method is characterized by comprising the following steps: (1) collecting n rack hot continuous rolling mill equipment and rolling schedule parameters; (2) collecting the roll force and the convexity offset value of a last rack plate in situ; (3) calculating the plate shape stiffness of each rack; (4) keeping the thickness of the outlet of the tail rack to be constant; (5) inversely calculating the convexity variable quantity of the mechanical plate of the i rack from the tail rack; (6) calculating the roll force and the variable quality of the thickness of the inlet of the i rack; (7) calculating the thickness of the new inlet and outlet of the i rack; (8) calculating the rolling reduction and adjusted quantity of the i rack; (9) calculating the convexity variable quantity of the outlet plate of the (i-1) rack according to the equi-proportional convexity condition; (10) repeating steps from (5) to (9) to obtain the rolling reduction and adjusted quantities of 2nd to n racks; (11) calculating the rolling reduction and adjusted quantity of the first rack; and (12) carrying out on-line coordination control according to the rolling reduction and adjusted quantities, thereby achieving the purpose of coordination control on the plate shape and plate thickness.

Description

technical field [0001] The invention belongs to the technical field of continuous hot rolling of plates and strips, and in particular relates to an on-line coordinated control method for the plate shape and thickness of a continuous hot rolling mill of plates and strips. Background technique [0002] Plate shape and plate thickness accuracy are two important indicators to measure the quality of strip hot rolling products. Whether it is thickness control or shape control, the core of both is to control the shape of the load-bearing roll gap of the rolling mill, so there will be mutual interference coupling between the two control systems. The effective way of plate thickness control is to adjust the pressing position, that is, to eliminate the influence of various factors on the thickness of the rolled piece by changing the size of the bearing roll gap of the rolling mill. In the process of adjusting the size of the load-bearing roll gap of the rolling mill, the shape of the...

AI Technical Summary

Problems solved by technology

[0005] (1) The method of relying on the purchase of equipment with plate shape and thickness control functions to meet product quality control requirements still occupies a dominant position, with high construction and operation costs and heavy burdens on enterprises

[0006] (2) Currently used rolling mills with flatness control function have very complex process specification settings, and there are hundreds of control parameters that need to be optimized; moreover, different rolling mills and products of different specifications require different process control parameters, which need to be established relatively complete database

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