Plate and strip cross section local high and sinking point on-line identification method

Abstract

The invention relates to the field of plate and strip rolling, and designs a plate and strip cross section local high(sinking) point on-line identification method. Firstly, thickness distribution data of plate and strip cross section full width are obtained; a quartic polynomial and n(5<=n<=15)-period movement average line are used for fitting of thickness distribution of the plate and strip cross section full width; a quartic polynomial curve is subtracted from the movement average line, a difference value distribution curve of the thickness distribution is obtained, and the height and the width of a local high(sinking) point are obtained through the difference value distribution curve according to a certain rule; and the area of the part, exceeding a local high(sinking) point threshold value line, of the difference value distribution curve is calculated, and the local high(sinking) point height at the position of the maximum area serves as a plate and strip cross section local high point or local sinking point magnitude is obtained. By means of the plate and strip cross section local high(sinking) point on-line identification method, the problem that in the plate and strip rolling production, as the local high(sinking) point cannot be identified, accurate evaluation and control cannot be achieved is solved, and plate and strip cross section local high(sinking) point on-line identification is achieved.

Description

Technical field: [0001] The invention relates to the field of strip rolling, in particular to the on-line identification of local high (concave) point defects in the cross section of the strip. Background technique: [0002] The quality of the cross-sectional profile of the strip along the width direction is usually measured by four indicators: convexity, wedge shape, edge drop, and local high (concave) points, where the convexity, wedge shape, and edge drop have clear definitions and uniform Quantification standard, while local high (concave) points, such as figure 1 As shown, there is no uniform definition and quantification standard. The local high (concave) point is generally considered to be a tendency that the strip cross-sectional thickness curve has a tendency to protrude (concave) in a certain place compared with the surrounding area, but it is different from the sharp fluctuation of the cross-sectional thickness data in a small range. Such defects have an importa...

AI Technical Summary

Problems solved by technology

[0005] The invention provides an online identification method for local high (concave) points in the cross-section of the strip, and comprehensively designs the deviation between the distribution trend of the actual section thickness and the ideal distribution trend, so as to solve the problem that the cross-section of the strip cannot be determined online in the existing industrial production The problem that it is impossible to evaluate, judge and control the quality of the cross-sectional profile of the strip caused by the local high (concave) point value

Images