Automatic control method for hot rolling width allowance

Abstract

The invention discloses an automatic control method for hot rolling width allowance, and belongs to the field of rolling. The width allowance is obtained through model calculation. The automatic control method comprises the steps that width allowance model calculation is carried out; strip steel rough rolling and finish rolling strip steel full-length rolling data are collected, and data processing is completed; the total control quality standard deviation of the strip steel width is calculated; according to standard normal distribution table distribution data f(K), value K is iteratively calculated; according to the value K, the width allowance is calculated; the abnormal high point WMax and the abnormal low point WMin of the strip steel full length are considered, and the width allowanceis corrected in a weighted manner; and rough rolling width target calculation and width setting calculation are completed, and strip steel width control rolling is completed. According to the automatic control method, the strip steel width allowance is dynamically calculated by integrating the rough rolling width control precision, the finish rolling broadening prediction precision and the stripsteel full-length fluctuation, and therefore the overall hot rolling width allowance is optimized, and the strip steel width allowance loss is reduced. The automatic control method can be widely applied to the field of strip steel hot rolling width allowance calculation and control.

Description

technical field [0001] The invention belongs to the rolling field of steel strips, in particular to a method for controlling the hot rolling width allowance of steel strips. Background technique [0002] Width is an important technical index of hot-rolled products (strip steel). The requirements for the width of hot-rolled products do not produce negative tolerances (that is, the hot-rolled width is often said to not allow negative tolerances). If there is a negative tolerance in the width, it will cause a quality blockade (the product will be judged to be scrapped or downgraded). [0003] In order to prevent the negative deviation of the hot-rolled product in the full-length direction, the traditional hot-rolled width control leaves a certain margin, and these margin values ​​are generally determined by the craftsman in the process table, or take the allowable tolerance of the width of the hot-rolled product Median. The width allowance will be cut off after cold rolling, ...

AI Technical Summary

Problems solved by technology

The width allowance will be cut off after cold rolling, which is a loss

[0004] Due to the variety of specifications in a hot-rolled production line, it is difficult for craftsmen to carefully adjust the margin of each product specification; and the difficulty of controlling the width of hot-rolled products of different specifications is different. If the margin is too large, the subsequent process will cause cutting damage , and the margin is too small, it may cause hot-rolled quality blockage

[0005] Based on the statistics of a typical hot rolling production line with an annual output of 4 million tons, an increase of 1mm margin will cause a loss of 4 million

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