A Control Method for Warping and Knocking of Medium and Heavy Plate Rolling Mill

Abstract

The invention provides a method for controlling warping and buckling of medium and heavy plate rolling mills. The technical scheme is as follows: including the difference in the thickness of slabs transported from the heating furnace, the PLC control system calculates the KP coefficient value; the thickness of the currently rolled slabs is greater than or equal to When the steel plate is buckled to 300mm, the response time of the upper motor speed of the roughing mill is slowed down; when the thickness of the slab is less than 300mm, the response time of the upper motor speed of the roughing mill is accelerated; the KP value is sent to ACS6000 control system, adjust the KP coefficient of ACS6000 on the upper roll of the rolling mill when rolling the head of the steel plate, so as to realize the setting of different KP coefficients for slabs with different thicknesses; adjust the speed response time by driving the upper and lower rolls, and realize the operator's control of rolling The buckle and head of the steel plate.

Description

technical field [0001] The invention relates to the technical field of rolling mill control, in particular to a method for controlling warping and buckling of a medium and thick plate rolling mill. Background technique [0002] The rolling mill is one of the important equipments on the hot-rolled steel production line. It is mainly composed of upper and lower support rolls, upper and lower work rolls, electrical and hydraulic equipment, and roll gap adjustment devices, etc. It is used to realize the rolling of steel plates with different thicknesses. The transmission system of the 3500mm rolling mill adopts ABB’s ACS6000 medium-voltage transmission system, which has advanced DTC control theory, and the torque response time is 10 times faster than the traditional magnetic flux vector and pulse width modulation control methods, with accurate static speed and Torque control and other advantages. In the steel plate rolling production, due to the influence of steel temperature, ...

AI Technical Summary

Problems solved by technology

In the steel plate rolling production, due to the influence of steel temperature, steel type, slab thickness and other factors, the control of steel plate warping and buckle is particularly important. If the steel plate warping is too large, it will affect the upper work roll of the rolling mill. If the mill buckle is too large, it will impact the lower work roll of the rolling mill and the roller table at the exit and entrance. The motor and bearing seat of the roller table are easily damaged. At the same time, the steel plate The surface quality is also not guaranteed

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