A Method for Extracting Characteristic Parameters of Strip Thickness Transverse Distribution

Abstract

Disclosed is a strip steel thickness lateral distribution characteristic parameter extraction method. The method is characterized by including: a1, describing a horizontal coordinate of original data, wherein the actually-measured thickness at an xi position is hi; a2, enabling p to be 3, q to be (n-2) and a minimum sum of square of deviations ymin to be 100; a3, taking xp and xq as boundary points; a4, listing fitting functions; a5, taking the situations that two-section function values are equal and first derivative values are equal as constraint conditions; a6, taking coefficients as variables, setting fitting curves and functions of sums of square of deviations and taking a minimum function value of the sums of square of deviations as a constraint condition; a7, solving the coefficients according to the simultaneous conditions and recording the sums of square of deviations of the functions and the actually-measured values; a8, enabling q to be (q-1), if q>=n / 2, returning to the step a3, and if q<n / 2, entering step a9; a9, enabling p to be (p+1), if p<=n / 2, returning to the step a3, and if p>n / 2, entering step a10; a10, outputting the coefficients as optimum strip steel thickness lateral distribution characteristic parameters. By the strip steel thickness lateral distribution characteristic parameter extraction method, steel strip edge drop is described, equipment provided with a profiler can be improved in the aspect of the fitting functions, and after equipment without the profiler performs lateral distribution extraction of the thickness offline, applying the method to online production enables strip steel sectional quality and fitting precision to be improved.

Description

technical field [0001] The invention relates to a feature parameter extraction method, in particular to a feature parameter extraction method of strip thickness lateral distribution. Background technique [0002] Rolling is a high-efficiency and high-precision strip steel production process. Through rolling, strips of various specifications can be produced, and the finished product has good quality and high performance. It has become the most common steel production method. During the strip rolling process, at a certain position from the center of the width, there will be a phenomenon that the thickness of the strip decreases sharply, which is called edge thinning. Its shortcomings: (1) The rolling pressure is unevenly distributed in the width direction of the roll, especially at the edge, the rolling force will decrease sharply, causing the elastic flattening of the work roll to decrease sharply at the edge, and the load The roll gap is reduced, resulting in edge thinning;...

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Problems solved by technology

Its shortcomings: (1) The rolling pressure is unevenly distributed in the width direction of the roll, especially at the edge, the rolling force will decrease sharply, causing the elastic flattening of the work roll to decrease sharply at the edge, and the load The roll gap is reduced, resulting in edge thinning; (2) The elastic bending of the work roll makes the load roll gap smaller at the edge, which is easy to cause edge thinning; (3) The flow law of the edge of the strip is different from that of the internal metal , the lateral resistance of the edge metal of the strip steel is small, and lateral flow is prone to occur, which aggravates the thinner edge; (4) The wear of the rolls in the edge area is small, so that the edge roll gap is reduced, resulting in edge reduction Thin

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