Control method of eliminating static rolling torque in band and strip rolling mill

Abstract

The invention discloses a control method of eliminating static rolling torque in a band and strip rolling mill. The control method comprises the following steps of: step one. starting the rolling mill, causing silicon controlled rectifier trigger pulse control to be in an opening enabled state, and starting the rolling mill for rolling under the control of a direct-current speed adjusting controller according to the speed given value P1, wherein the previous five times stopping of the present rolling period aims at changing a rolling direction, namely causing the rolling mill to be in a zero speed working state; during reverse rolling, the direct-current speed adjusting controller quickly reduces forward current and establishes reverse current as long as the given value of the rolling speed P1 of the rolling mill is negated, controlling a main motor of the rolling mill to carry out reverse rolling according to the set speed till completing the last rolling pass in the present rolling period; and step two. sequentially stopping, losing tension, opening cleaning between rolls and discharging coils, thereby ending the whole rolling period of a steel coil. The control method greatly prolongs the service life of each impacted part, improves the working efficiency of the rolling mill and increases the yield of steel coils.

Description

technical field [0001] The invention belongs to the technical field of metallurgical rolling control and relates to a control method for eliminating static rolling torque in a strip rolling mill. Background technique [0002] Each hot-rolled steel coil with an incoming material thickness of 3.0mm goes through 6 passes (the rolling pass setting is usually arranged according to the thickness of the incoming material and the thickness of the finished product, or it may be 5 passes. After the forward and reverse rolling of 6 passes as an example), the thickness of the finished product reaches 0.3mm. During the rolling process, there will be 6 stops, 5 of which need to change the rolling direction. [0003] According to the existing rolling control method, it is necessary to block the control pulse of the rolling mill after each stop, so that the output torque of the shaft end of the main motor is instantly reduced to zero. The device will be damaged by 6 impacts, and the impact...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a control method for eliminating the static rolling torque in a strip mill, which solves the unreasonable control method in the prior art, which causes the roll, reducer, and safety coupling to be damaged by impact, shortens the service life, and causes equipment The maintenance workload is heavy and the production efficiency is reduced

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