A looper control method for pipeline steel

Abstract

The invention provides a movable sleeve control method for pipeline steel, and belongs to the field of steel rolling. The method includes the steps that firstly, control parameters of movable sleeves between every two adjacent machine frames are determined through a first-stage computer and a second-stage computer according to the following formulas, wherein the target temperature of a strip steel finish rolling outlet is smaller than or equal to 810 DEG C, and the thickness of a finished product is larger than or equal to 8 mm; secondly, a table model of movable sleeve steel type tension coefficients is set up through the second-stage computer according to the requirements for process data and steel types, and steel type tension coefficients of different movable sleeves are obtained by looking up a table and sent out through the second-stage computer during rolling. By means of the movable sleeve control method, the hydraulic movable sleeves between the hot continuous rolling finish rolling machine frames are automatically controlled when the pipeline steel is rolled, the problem that the hydraulic movable sleeves between the hot continuous rolling finish rolling machine frames vibrate is solved when the pipeline steel is rolled, and abnormal shutdown time is shortened.

Description

technical field [0001] The invention relates to an automatic control method of a hot strip rolling line. Background technique [0002] Because the finishing stand of the hot continuous rolling mill generally consists of 7 rolling mills, a hydraulic looper is arranged between every adjacent two rolling mills. The control of the finishing mill is realized by the first and second-level computers. The tension coefficient of each rolling mill steel type and the set tension of the looper are all calculated by the second-level model server according to the process requirements before the strip enters the rolling mill. The looper torque of each rolling mill Regulatory control and so on are completed by the first-level computer PLC. With the development of special steel varieties, when rolling thick-gauge pipeline steel, the speed of the finishing stand is very low (less than 2.5m / s) and the response characteristics are not good at low speeds, so the hydraulic looper adjustment and ...

AI Technical Summary

Problems solved by technology

With the development of special steel varieties, when rolling thick-gauge pipeline steel, the speed of the finishing stand is very low (less than 2.5m / s) and the response characteristics are not good at low speeds, so the hydraulic looper adjustment and the rolling mill stand The speed adjustment does not match, resulting in the oscillation phenomenon of the 0#-5# looper between the finishing rolling stands, which will lead to direct scrap steel between the finishing stands, seriously affecting the normal production of the rolling line, and bringing great economic losses to the enterprise

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