Control method of compensation speed decrease of hot continuous rolling finish rolling rack

Abstract

The invention relates to a control method of compensation speed decrease of a hot continuous rolling finish rolling rack, belonging to the field of steel rolling. According to the method, before steel is bitten by the finish rolling rack, a speed compensation value is applied to the rack in advance, and the speed compensation value is 2-5% of the rack speed reference value; after the steel is bitten for 100-200ms, the speed compensation value is canceled, and the rack speed reference value is recovered for rolling. After the method is adopted, the speed decrease of the rack which bites the steel can be reduced, a strip steel movable sleeve between racks is normally controlled, the rolled waste steel is reduced, and good benefit is obtained.

Description

technical field [0001] The invention belongs to the field of steel rolling, and in particular relates to an automatic speed control method of a hot continuous strip steel finishing rolling unit. Background technique [0002] Due to the different materials and temperatures of the special steel varieties rolled by Taiyuan Iron and Steel Co., Ltd., the rolling pressure and speed drop are large when the strip is threaded in the finishing rolling unit, which can easily cause abnormal movement of the looper between the stands, resulting in Unstable rolling of finish rolling may even produce scrap steel and damage mechanical equipment. Therefore, to solve the problem of different speed drops under different loads of finishing stands and to ensure rolling stability, one of the keys is the compensation speed drop control of hot rolling finishing stands. Contents of the invention [0003] The purpose of the present invention is to effectively ensure the action of the looper between...

AI Technical Summary

Problems solved by technology

[0002] Due to the different materials and temperatures of the special steel varieties rolled by Taiyuan Iron and Steel Co., Ltd., the rolling pressure and speed drop are large when the strip is threaded in the finishing rolling unit, which can easily cause abnormal movement of the looper between the stands, resulting in Unstable rolling of finish rolling or even scrap steel and damage to mechanical equipment

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