Thickness control method for 1720mm strip steel cold continuous rolling unit

Abstract

The invention discloses a thickness control method for a 1720mm strip steel cold continuous rolling unit, and belongs to the technical field of material processing engineering. A first thickness gaugeand a first knotmeter are arranged at the front side of a first rack; a second thickness gauge and a second knotmeter are arranged at the rear side of the first rack; a third speed gauge is arrangedat the rear side of a second rack; and a third thickness gauge is arranged at the rear side of a fifth rack. According to the invention, the adjustment in advance is carried out according to a feed forward signal and incoming material situation, and a next rolling mill is pressed and controlled by the indirect thickness measuring information at the entrance of the rolling mill. The control increment is reduced by delay pressing to avoid oscillation and reduce the lag time; the monitoring amount can be fed back to the front rack in time through a feedback signal, namely, the pressing position of a roller gap is adjusted according to a deviation signal after comparing a measured value with a given value, and the thickness is controlled within a deviation range.

Description

Technical field [0001] The invention relates to the technical field of material processing engineering, in particular to a thickness control method of a 1720mm strip cold tandem rolling mill. Background technique [0002] With the development of production and the progress of science and technology, the requirements for the quality of the plate and strip are getting higher and higher, especially the requirements for the accuracy of its geometric dimensions are getting stricter. Many scholars at home and abroad have conducted in-depth research on how to improve the geometrical dimensional accuracy of plate and strip materials. Like other technological developments, the development of plate thickness adjustment technology for strip rolling mills has also undergone a process from coarse to fine, successively through manual pressing to adjust plate thickness, electric pressing to adjust plate thickness, and electric double pressing system adjustment. Plate thickness, electro-hydraul...

AI Technical Summary

Problems solved by technology

[0004] The traditional AGC is mainly based on the thickness feedback method, that is, the thickness at the exit of the rolling mill is used for feedback closed-loop control of the reduction. A thickness gauge is installed at the exit of the rolling mill, and feedback control with the signal of the thickness gauge can make full use of the effect of the thickness gauge on the rolling thickness. Accurate thickness measurement information, but the lag is too large. Not only does the pressing mechanism have a response time, but it also takes a few seconds for the rolled piece to go from the rolling mill to the thickness gauge (the lower the rolling speed, the longer the time)

Images