Method for online predicting and controlling of roughness of surface of cold-rolled thin steel strip
A surface roughness and control method technology, which is applied in the direction of rolling mill control devices, metal rolling, metal rolling, etc., can solve the problems of high cost of measuring instruments, failure to achieve full length prediction, etc., and achieve the effect of cost reduction
Active Publication Date: 2011-05-11
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
However, this control method does not realize the full length prediction, and it needs to be equipped with a roughness measuring instrument, and the cost of the measuring instrument is high. This control method is only applicable to the five-stand continuous rolling mill
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[0054] (1) Calculate the average roughness of the rolls by knowing the roughness of the rolls of the skin pass mill
[0055] R 1 - The roughness of the operating side of the upper roll is 1.59;
[0056] R 2 - The middle roughness of the upper roll is 1.60;
[0057] R 3 - The roughness of the transmission side of the upper roll is 1.59;
[0058] R 4 - The roughness of the operating side of the upper roll is 1.59;
[0059]R 5 - The middle roughness of the upper roll is 1.60;
[0060] R 6 - The roughness of the transmission side of the upper roll is 1.59; then it can be obtained:
[0061] -Roll average roughness=(1.59+1.60+1.59+1.59+1.60+1.59) / 6=1.60;
[0062] (2) Collect the strip length L of 1-100 meters through the leveling process machine di The average rolling force P di and average elongation Y di , and the length interval d=1 meter, see columns C1, C2 and C3 in Table 1;
[0063] (3) Judging the average rolling force P di and average elongation Y di Whethe...
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Abstract
The invention discloses a method for online predicting and controlling roughness of surface of a cold-rolled thin steel strip, comprising: inputting the roughness data of each roller of a leveling machine; calculating an average roughness R0 of the rollers; online collecting the length Ldi of the steel strip and the average rolling force Pdi and average elongation Ydi of the steel strip in different length distances d; calculating a roughness reproduction ratio yi which represents a ratio of the roughness of the steel strip in an outlet of the leveling machine to the roughness of a working roller of the leveling machine and has a mathematical expression, namely roughness reproduction ratio=0.784+0.000038 leveling rolling force-0.330 leveling elongation; calculating a roughness estimated value Ra of each length position of the steel strip according to Ra=yi*R0; calculating a roughness predicting region PI of each length position of the steel strip according to PI=( yi+-2*S)*R0, wherein S is a constant value; and comparing a target value of the roughness of the steel strip and the roughness predicting region, wherein if the target value of the roughness of the steel strip is beyond the predicting region, the rolling force and the leveling elongation are subjected to online proper adjustment.
Description
technical field [0001] The invention relates to an on-line prediction and control method for the surface roughness of smooth cold-rolled strip steel. Background technique [0002] The inconsistent surface roughness of cold-rolled thin strip steel is one of the common defects of cold-rolled products. The inconsistent surface roughness of the steel plate will seriously affect the user's stamping, painting and coating, and cause parts to be scrapped; when the product roughness does not match the manufacturer, it is often In batches, it will cause product revision and rework. [0003] At present, the control of the surface roughness of tempered cold-rolled strip steel is mainly guaranteed by the selection of the roughness of the work rolls of the temper mill, see figure 1 , but the actual surface roughness of cold-rolled thin strip is not only related to the roughness of the work rolls, but also related to the elongation of the temper, the pressure of the temper rolling, the to...
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IPC IPC(8): B21B37/00
Inventor 刘俊祥林秀贞
Owner BAOSHAN IRON & STEEL CO LTD