Roll bending compensation method for wide and thick metal plates straightening machine

Abstract

The invention relates to the field of controlling straightened plate shape of metal plates, and particularly relates to a method for controlling the straightened roll gap shape of multiple rolls of the wide and thick metal plates. A roll bending compensation method for wide and thick metal plates straightening machine comprises the following steps of: firstly determining a deflection model of a beam of the straightening machine, then collecting parameters of the straightened metal plates, calculating to obtain a deflection of an initial upper beam and a deflection of an initial lower beam, and increasing corresponding compensation in a bending roll model for compensation; acquiring oil pressure through an oil pressure sensor, calculating to obtain measured values of the parameters, calculating differential values of the parameters and calculating to obtain a modified value of the deflection of the upper beam and a modified value of the deflection of the lower beam respectively by combining the parameters of the upper beam and the lower beam, and increasing the corresponding compensation in the bending roll model for compensation. According to the invention, corresponding modification control is increased in a control system of the straightening machine, the change of the on-load roll gap of the straightening machine is determined, so that the roll gap control of the straightening machine is not affected by the change of the state of the supplied materials, so that the index of the straightened plate shape is guaranteed, and the straightening effect is effectively improved.

Description

technical field [0001] The invention relates to the field of shape control for metal plate straightening, in particular to a roll gap shape control method for multi-roller straightening of wide and thick metal plates. Background technique [0002] The straightening of wide and thick metal plates generally adopts a multi-roller straightening machine. Taking wide and thick plates made of steel as an example, 5-roll, 7-roll, 9-roll, 11-roll straightening modes can be used. No matter how the straightening is done, it is fundamentally to achieve the purpose of straightening through the repeated bending of the wide and thick plates in the roll gap of the leveler, that is, the metal plate is straight after straightening. It can be seen that the straightening machine achieves the purpose of improving the shape of the plate by eliminating the internal residual stress of the wide and thick plate, rather than improving the shape of the plate through obvious dimensional changes. [00...

AI Technical Summary

Problems solved by technology

[0004] For the straightening process of wide and thick plates, the deformation of the steel plate causes the deflection of the straightening machine, which changes the straightening roll gap, which is equivalent to applying negative bending to the steel plate during the straightening process, which seriously affects the straightening effect of the steel plate, especially in the When the straightening force fluctuates

In the prior art, the fixed positive roll bending amount is generally used to compensate the deformation of the straightening machine, and the determination of the compensation amount is pre-calculated through a rather complicated finite element method, which takes a long time to calculate, and the actual roll gap changes during the straightening process no motion compensation

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