A method for judging the quality of strip cross-section profile

Abstract

The present invention provides a method for determining the quality of a strip cross-sectional profile, and relates to the technical field of strip rolling production. The present invention is based on the strip cross-sectional thickness detection data of a multifunctional instrument, does not require excessive data processing, and realizes automatic determination of the hot-rolled steel strip cross-sectional profile by selecting characteristic points for determination, that is, determination of local high points, convexity, and wedge shape, thereby solving the problems of inconsistent manual detection standards for local high points and inaccurate calculation of high point sizes; at the same time, the present invention effectively distinguishes between local high point defects that may occur in the middle and edge areas of the strip, thereby solving the problem of inaccurate selection of the thickest and thinnest points of the strip cross section due to cross-sectional fluctuations.

Description

Technical Field

[0001] The invention relates to the technical field of plate and strip rolling production, in particular to a method for determining the quality of a plate and strip cross-section profile. Background Art

[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 points. The former three have clear definitions and unified quantitative standards, while local high points lack unified definitions and quantitative standards. Generally speaking, local high points are regarded as the thickness curve of the strip cross section that obviously protrudes from the surrounding area in some areas, but is different from the drastic fluctuation of thickness data in a small range. In addition, the requirements for local high points are different for different steel grades, and their locations are not fixed, so they are usually judged by manual inspection and measurement data.

[0003] However, this manual judgment method is highly dependent on experience, which makes it difficult to guarantee accuracy and is not convenient for large-scale production statistics like indicators such as convexity, wedge shape and edge drop. This not only affects the reliability of quality control, but also is not conducive to in-depth analysis and optimization of production conditions. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide a method for determining the quality of a strip cross-section profile, comprising:

[0005] Step 1: Obtain a cross section of the width and thickness of the rolled strip, determine a measuring point along the direction of the width of the rolled strip according to a preset width interval, and collect measuring point data corresponding to the measuring point, wherein the measuring point data includes the width and thickness corresponding to the measuring point, obtain the total length of the width of the cross section, determine the value of the center width of the cross section, and construct a thickness distribution curve of the measuring point data based on the measuring point data, using the width as the abscissa, the thickness as the ordinate, and the value of the center width as the zero point of the abscissa;

[0006] Step 2: According to the thickness distribution curve, determine the two measurement points whose widths are closest to the zero point of the horizontal coordinate, obtain the thickness of the two measurement points, and calculate the average of the thickness of the two measurement points as the center thickness of the rolled plate and strip;

[0007] Step 3: subtract the center thickness from the thickness of each measuring point in the thickness distribution curve to obtain a relative thickness distribution curve;

[0008] Step 4: taking the zero point of the horizontal coordinate in the relative thickness distribution curve as the dividing line, taking the area on one side of the zero point of the horizontal coordinate as the operating side, and taking the other side of the zero point of the horizontal coordinate as the transmission side, and then determining the operating side edge area and the center-biased operating side area in the operating side, and determining the center-biased transmission side area and the transmission side edge area in the transmission side according to a preset width threshold;

[0009] Step 5: Determine characteristic points in the relative thickness distribution curve;

[0010] Step 6: Calculate the convexity based on the relative thickness of the center thickness and the relative thickness of the feature points Crown and wedge Wedge , and then according to the convexity Crown and wedge Wedge , determine the convexity determination result of the rolled plate and strip and the wedge determination result of the rolled plate and strip;

[0011] Step 7: Based on the width and relative thickness of the feature points, local high point determination is performed on the operating side edge region and the transmission side edge region to obtain local high point determination results of the operating side edge region and local high point determination results of the transmission side edge region, thereby determining the final wedge determination result;

[0012] Step 8: Based on the relative thickness of the feature points, local high points of the center-biased operation side region and the center-biased transmission side region are determined to obtain local high point determination results of the center-biased operation side region and local high point determination results of the center-biased transmission side region;

[0013] Step 9: According to the width of the cross section, the relative thickness of the cross section, and the convexity Crown , Wedge Wedge, The convexity judgment results, wedge shape judgment results, local high point judgment results of the operating side edge area, local high point judgment results of the transmission side edge area, local high point judgment results of the center-biased operating side area and local high point judgment results of the center-biased transmission side area are used to generate cross-sectional judgment information on the width and relative thickness of the rolled strip and draw a cross-sectional thickness distribution diagram of the strip.

[0014] Optionally, a local high point determination threshold is preset h 1 and the local high point determination distance threshold l ;

[0015] The feature points include operating side edge points W OS_0 and transmission side edge point W DS_0 , wherein the operating side edge point is the measurement point on the operating side that is farthest from the zero point of the horizontal coordinate in the relative thickness distribution curve, and the transmission side edge point is the measurement point on the transmission side that is farthest from the zero point of the horizontal coordinate in the relative thickness distribution curve;

[0016] The characteristic points also include the relatively thickest point on the operating side H OS_max , Relatively thickest point on the transmission side H DS_max , the thinnest point on the operating side H OS_min , the thinnest point on the transmission side H DS_min , the relative thickest point of the operating side area H OS_local_max , the relative thickest point of the transmission side edge area H DS_local_max , the relative thickness of the operating side area is the thinnest point H OS_local_min The thinnest point relative to the transmission side edge area H DS_local_min ;

[0017] Based on this, in step 7, based on the width and relative thickness of the feature points, local high point determination is performed on the operating side edge region and the transmission side edge region, and the local high point determination results of the operating side edge region and the local high point determination results of the transmission side edge region are obtained, including:

[0018] Step 7.1: Perform local high point determination on the operating side edge region to obtain a local high point determination result of the operating side edge region;

[0019] Step 7.1.1: Determine the relative thickness of the thickest point on the operating side H OS_max RT Relative thickness to the thickest point of the operating side area H OS_local_max RT Are they equal? ​​If they are equal, the relatively thickest point on the operating side is selected as the first feature point. If they are not equal, the relatively thickest point on the edge of the operating side is selected as the first feature point.

[0020] Step 7.1.2: Determine the relative thickness of the thinnest point on the operating side H OS_min RT Relative thickness of the thinnest point relative to the operating side edge area H OS_local_min RT Are they equal? ​​If they are equal, the point with the thinnest relative thickness in the edge area of ​​the operating side is taken as the second characteristic point. If they are not equal, the point with the thinnest relative thickness in the edge area of ​​the operating side is taken as the second characteristic point;

[0021] Step 7.1.3: Obtain the difference between the relative thickness of the first feature point and the relative thickness of the second feature point to obtain the local high point on the operating sideH OS_local , if the local high point on the operating side H OS_local Less than the local high point determination threshold h 1, the local high point determination result of the operating side edge area is that there is no local high point in the operating side edge area. H OS_local Greater than or equal to the local high point determination threshold h 1. Execute step 7.1.4.

[0022] Step 7.1.4: Get the difference between the width of the first feature point and the width of the second feature point l OS_judge ,like l OS_judge Greater than the local high point determination distance threshold l , the local high point determination result of the operation side edge area is that there is no local high point in the operation side edge area. l OS_judge Less than or equal to the local high point determination distance threshold l , execute step 7.1.5;

[0023] Step 7.1.5: Calculate the width of the first feature point and the width of the edge point on the operating side W OS_0 AW The absolute value of the difference between l OS_local , and obtain the local high point determination result of the operating side edge area. At this time, the local high point determination result of the operating side edge area is the distance from the operating side l OS_local There are local high points H OS_local .

[0024] Step 7.2: local high point determination is performed on the transmission side edge region to obtain the local high point determination result of the transmission side edge region;

[0025] Step 7.2.1: Determine the relative thickness of the thickest point on the transmission side H DS_max RT Relative thickness to the thickest point of the transmission side edge area H DS_local_max RT Are they equal? ​​If they are equal, the relatively thickest point on the transmission side is selected as the third characteristic point. If they are not equal, the relatively thickest point on the edge of the transmission side is selected as the third characteristic point.

[0026] Step 7.2.2: Determine the relative thickness of the thinnest point on the transmission side H DS_minRT Relative thickness of the thinnest point relative to the transmission side edge area H DS_local_min RT Are they equal? ​​If they are equal, the point with the thinnest relative thickness in the edge area of ​​the transmission side is taken as the fourth characteristic point. If they are not equal, the point with the thinnest relative thickness in the transmission side is taken as the fourth characteristic point.

[0027] Step 7.2.3: Obtain the difference between the relative thickness of the third feature point and the relative thickness of the fourth feature point to obtain the local high point on the transmission side H DS_local , if the local high point on the transmission side H DS_local Less than the local high point determination threshold h 1. The local high point determination result of the transmission side edge area is that there is no local high point in the transmission side edge area. H DS_local Greater than or equal to the local high point determination threshold h 1. Execute step 7.2.4.

[0028] Step 7.2.4: Get the difference between the width of the third feature point and the width of the fourth feature point l DS_judge ,like l DS_judge Greater than the local high point determination distance threshold l , the local high point determination result of the transmission side edge area is that there is no local high point in the transmission side edge area. l DS_judge Less than or equal to the local high point determination distance threshold l , execute step 7.2.5;

[0029] Step 7.2.5: Calculate the width of the third feature point and the width of the edge point on the transmission side W DS_0 AW The absolute value of the difference between l DS_local , and the local high point determination result of the transmission side edge area is obtained. At this time, the local high point determination result of the transmission side edge area is the distance from the transmission side l DS_local There are local high points H DS_local .

[0030] Optionally, a threshold for determining the thickness difference between the two sides is preset h 3;

[0031] Based on this, the final wedge determination result is determined in step 7, including:

[0032] Obtain the target difference between the relative thickness of the first feature point determined in step 7.1.1 and the relative thickness of the third feature point determined in step 7.2.1, and determine the target difference and the thickness difference determination threshold on both sides. h 3, when the target difference is less than the thickness difference judgment threshold on both sides h 3, the wedge determination result is the same as the wedge determination result in step 7; when the target difference is greater than or equal to the thickness difference determination threshold on both sides h In case 3, the wedge shape determination result in step 7 is updated to the actual wedge shape being too large, which may cause the risk of rib formation in the future.

[0033] Optionally, a mid-thickness fluctuation threshold is preset h 2;

[0034] The characteristic points also include the center point of the rolled strip W C , the boundary point between the operating side area and the central operating side area E OS The dividing point between the transmission side edge area and the center transmission side area E DS ;

[0035] Based on this, step 8 specifically includes:

[0036] Step 8.1: Use the quadratic curve to calculate the relative thickness of the center point of the rolled strip. W C RT , the relative thickness of the boundary between the operating side area and the central operating side area E OS RT , the relative thickness of the boundary between the transmission side edge area and the center transmission side area E DS RT Perform fitting to obtain the fitting function;

[0037] Step 8.2: Substitute the width of each measurement point in the relative thickness distribution curve into the fitting function to obtain an ideal thickness curve;

[0038] Step 8.3: Subtract the relative thickness of each measuring point in the relative thickness distribution curve from each relative thickness in the ideal thickness curve to obtain the thickness difference corresponding to each measuring point;

[0039] Step 8.4: Determine the thickness difference corresponding to each measurement point and the middle thickness fluctuation threshold h 2, determine the local high point judgment result of the center-biased operation side area and the local high point judgment result of the center-biased transmission side area.

[0040] Optionally, step 8.4 specifically includes:

[0041] For the center-biased operating side area, if the thickness differences corresponding to all measurement points in the center-biased operating side area are less than the middle thickness fluctuation threshold h 2, the local high point determination result of the center-biased operation side area is no local high point; if the thickness difference in the center-biased operation side area is greater than or equal to the middle thickness fluctuation threshold h 2, then all the measurement points greater than or equal to the middle thickness fluctuation threshold are obtained. h 2, and all thickness differences greater than or equal to the middle thickness fluctuation threshold h 2, obtaining the maximum value as the first target value, and then obtaining the local high point determination result of the center-biased operation side area, wherein the local high point determination result of the center-biased operation side area is that there is a local high point at the width corresponding to the first target value, and the local high point is the first target value;

[0042] For the center transmission side area, if the thickness difference corresponding to all measurement points in the center transmission side area is less than the middle thickness fluctuation threshold h 2, the local high point determination result of the center-biased transmission side area is no local high point; if the thickness difference in the center-biased transmission side area is greater than or equal to the middle thickness fluctuation threshold h 2, then all the measurement points greater than or equal to the middle thickness fluctuation threshold are obtained. h 2, and all thickness differences greater than or equal to the middle thickness fluctuation threshold h 2, the maximum value is obtained as the second target value, and then the local high point judgment result of the center-eccentric transmission side area is obtained, and the local high point judgment result of the center-eccentric transmission side area is that there is a local high point at the width corresponding to the second target value, and the local high point is the second target value.

[0043] Optionally, a convexity threshold is preset c 1. Convexity determination threshold c 2. Wedge determination threshold w 1;

[0044] Based on this, in step 6, according to the convexity Crown and wedge Wedge , determine the convexity determination result of the rolled strip and the wedge determination result of the rolled strip, including:

[0045] Based on convexity Crown , convexity judgment threshold c 1 and convexity threshold c 2. Determine the convexity determination result of the rolled strip, including:

[0046] like Crown > c1, then the convexity judgment result is that the convexity of the rolled strip is too large. Crown <c 2, the convexity determination result is that the convexity of the rolled strip is too small. c 1 <Crown<c 21 , then the convexity determination result is that the convexity meets the standard;

[0047] Based on wedge Wedge and wedge determination threshold w 1. Determine the wedge shape determination result of the rolled strip, including:

[0048] like Wedge > w 1, the wedge shape judgment result is that the wedge shape of the rolled strip is too large. If 0 <Wedge<w 1, then the wedge shape determination result is that the rolled strip is a positive wedge shape. If - w 1 <Wedge< 0, the wedge shape determination result is that the rolled strip is a negative wedge shape. Wedge <-w 1, the wedge shape judgment result is that the wedge shape of the rolled plate and strip is too small.

[0049] Optionally, the feature points also include the operating side convexity and wedge calculation points W OS_40 , transmission side crown and wedge calculation points W DS_40 , where the operating side convexity and wedge calculation point W OS_40 The measuring point on the operating side that is the first threshold away from the zero point of the horizontal coordinate in the relative thickness distribution curve, the convexity and wedge calculation point on the transmission side W OS_40 is a measuring point on the transmission side that is at a first threshold distance from the zero point of the abscissa in the relative thickness distribution curve;

[0050] Based on this, in step 6, the convexity is calculated based on the relative thickness of the center thickness and the relative thickness of the feature points. Crown and wedge Wedge , and then according to the convexity Crown and wedge Wedge , including:

[0051] Calculate the relative thickness of the center thickness with the operating side convexity and wedge calculation points W OS_40 The relative thickness difference is obtained to obtain the first difference, and the relative thickness of the center thickness is calculated with the transmission side convexity and wedge calculation point W DS_40 The relative thickness difference is obtained to obtain the second difference, and the average of the first difference and the second difference is obtained to obtain the convexity of the rolled strip. Crown ;

[0052] The transmission side crown and wedge calculation points W DS_40 Relative thickness minus the operating side convexity and wedge calculation point W OS_40 The relative thickness of the rolled strip is obtained by Wedge .

[0053] The beneficial effects of adopting the above technical solution are:

[0054] 1. The present invention is based on the multifunctional instrument strip cross-section thickness detection data, does not require excessive data processing, and realizes automatic determination of the cross-section profile of the hot-rolled steel strip by selecting characteristic points for judgment, especially solving the problem of inconsistent manual detection standards for local high points and inaccurate calculation of high point size;

[0055] 2. The present invention effectively distinguishes the local high point defects that may occur in the middle and edge areas of the plate strip, and solves the problem of inaccurate selection of the thickest and thinnest points of the plate strip cross section due to cross-section fluctuations;

[0056] 3. The present invention provides a reporting function, which can, on the one hand, provide guidance for the cold rolling process production and optimize the scheduling for the coils with local high point defects; on the other hand, it records in detail the location, size and length of the local high points, which can provide data support for roll wear and roll shape optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic flow chart of a method for determining the quality of a strip cross-section profile in an embodiment of the present invention;

[0058] Figure 2 is a schematic diagram of a thickness distribution curve in an embodiment of the present invention;

[0059] Figure 3 is a schematic diagram of a relative thickness distribution curve in an embodiment of the present invention;

[0060] Figure 4 It is a schematic diagram of the thickness abnormal point determination process data of the center biased operation side area and the center biased transmission side area in an embodiment of the present invention;

[0061] Figure 5 Graph showing the thickness distribution of the strip cross section in an embodiment of the present invention. DETAILED DESCRIPTION

[0062] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0063] In view of the problems existing in the prior art, it is particularly important for the present invention to provide a technology that can automatically identify and quantify local high points, which will improve production efficiency, reduce manual intervention, and improve the consistency of product quality. By introducing advanced detection and analysis methods, the automatic monitoring of local high points can be better achieved, thereby optimizing the production process and reducing the occurrence of potential defects. Specifically, the present invention provides a method for determining the quality of the cross-sectional profile of a plate strip, combined with Figure 1 , which may include the following steps:

[0064] Step 1: Obtain the cross section of the width and thickness of the rolled strip, determine the measurement points along the width direction of the rolled strip according to the preset width interval, and collect the measurement point data corresponding to the measurement points, the measurement point data includes the width and thickness corresponding to the measurement point, obtain the total length of the width of the cross section, determine the value of the center width of the cross section, based on the measurement point data, use the width as the abscissa, the thickness as the ordinate, and the value of the center width as the zero point of the abscissa, and construct a thickness distribution curve of the measurement point data. The thickness distribution curve is as follows: Figure 2 .

[0065] Step 2: According to the thickness distribution curve, determine the two measurement points whose widths are closest to the zero point of the horizontal coordinate, obtain the thickness of the two measurement points, and calculate the average of the thickness of the two measurement points as the center thickness of the rolled plate and strip;

[0066] Step 3: Subtract the center thickness from the thickness of each measurement point in the thickness distribution curve to obtain a relative thickness distribution curve, such as Figure 3 ;

[0067] Step 4: taking the zero point of the horizontal coordinate in the relative thickness distribution curve as the dividing line, taking the area on one side of the zero point of the horizontal coordinate as the operating side, and taking the other side of the zero point of the horizontal coordinate as the transmission side, and then determining the operating side edge area and the center-biased operating side area in the operating side, and determining the center-biased transmission side area and the transmission side edge area in the transmission side according to a preset width threshold;

[0068] There are division criteria for the operating side area and the transmission side area:

[0069] When the strip width is greater than 1200mm, the area 40~200mm away from the strip edge is the operating side area and the other is the transmission side area;

[0070] When the strip width is between 1100mm and 1200mm, the area 40 to 160mm away from the strip edge is the operating side area and the other is the transmission side area;

[0071] When the strip width is between 1000mm and 1100mm, the area 40 to 120mm away from the strip edge is the operating side area and the other is the transmission side area;

[0072] When the strip width is less than 1000mm, the area 40~100mm away from the edge of the strip is the operating side area and the other is the transmission side area;

[0073] Step 5: Determine characteristic points in the relative thickness distribution curve;

[0074] Step 6: Calculate the convexity based on the relative thickness of the center thickness and the relative thickness of the feature points Crown and wedge Wedge , and then according to the convexity Crown and wedge Wedge , determine the convexity determination result of the rolled plate and strip and the wedge determination result of the rolled plate and strip;

[0075] The characteristic points also include the operating side convexity and wedge calculation points W OS_40 , transmission side crown and wedge calculation points W DS_40 , where the operating side convexity and wedge calculation point W OS_40 The measuring point on the operating side that is the first threshold away from the zero point of the horizontal coordinate in the relative thickness distribution curve, the convexity and wedge calculation point on the transmission side W OS_40 is a measuring point on the transmission side that is at a first threshold distance from the zero point of the abscissa in the relative thickness distribution curve;

[0076] Based on this, in step 6, the convexity is calculated based on the relative thickness of the center thickness and the relative thickness of the feature points. Crown and wedge Wedge , and then according to the convexity Crown and wedge Wedge , including:

[0077] Calculate the relative thickness of the center thickness with the operating side convexity and wedge calculation points W OS_40 The relative thickness difference is obtained to obtain the first difference, and the relative thickness of the center thickness is calculated with the transmission side convexity and wedge calculation point W DS_40 The relative thickness difference is obtained to obtain the second difference, and the average of the first difference and the second difference is obtained to obtain the convexity of the rolled strip. Crown ;

[0078] The transmission side crown and wedge calculation points W DS_40Relative thickness minus the operating side convexity and wedge calculation point W OS_40 The relative thickness of the rolled strip is obtained by Wedge .

[0079] Among them, the present invention presets a convexity judgment threshold c 1. Convexity determination threshold c 2. Wedge determination threshold w 1;

[0080] Based on this, in step 6, according to the convexity Crown and wedge Wedge , determine the convexity determination result of the rolled strip and the wedge determination result of the rolled strip, including:

[0081] Based on convexity Crown , convexity judgment threshold c 1 and convexity threshold c 2. Determine the convexity determination result of the rolled strip, including:

[0082] like Crown > c 1, then the convexity judgment result is that the convexity of the rolled strip is too large. Crown <c 2, the convexity determination result is that the convexity of the rolled strip is too small. c 1 <Crown<c 21 , then the convexity determination result is that the convexity meets the standard;

[0083] Based on wedge Wedge and wedge determination threshold w 1. Determine the wedge shape determination result of the rolled strip, including:

[0084] like Wedge > w 1, the wedge shape judgment result is that the wedge shape of the rolled strip is too large. If 0 <Wedge<w 1, then the wedge shape determination result is that the rolled strip is a positive wedge shape. If - w 1 <Wedge< 0, the wedge shape determination result is that the rolled strip is a negative wedge shape. Wedge <-w 1, the wedge shape judgment result is that the wedge shape of the rolled plate and strip is too small.

[0085] Step 7: Based on the width and relative thickness of the feature points, local high point determination is performed on the operating side edge region and the transmission side edge region to obtain local high point determination results of the operating side edge region and local high point determination results of the transmission side edge region, thereby determining the final wedge determination result;

[0086] Among them, the present invention presets a local high point determination threshold h1 and the local high point determination distance threshold l ;

[0087] The feature points include operating side edge points W OS_0 and transmission side edge point W DS_0 , wherein the operating side edge point is the measurement point on the operating side that is farthest from the zero point of the horizontal coordinate in the relative thickness distribution curve, and the transmission side edge point is the measurement point on the transmission side that is farthest from the zero point of the horizontal coordinate in the relative thickness distribution curve;

[0088] The characteristic points also include the relatively thickest point on the operating side H OS_max , Relatively thickest point on the transmission side H DS_max , the thinnest point on the operating side H OS_min , the thinnest point on the transmission side H DS_min , the relative thickest point of the operating side area H OS_local_max , the relative thickest point of the transmission side edge area H DS_local_max , the relative thickness of the operating side area is the thinnest point H OS_local_min The thinnest point relative to the transmission side edge area H DS_local_min ;

[0089] Based on this, in step 7, based on the width and relative thickness of the feature points, local high point determination is performed on the operating side edge region and the transmission side edge region, and the local high point determination results of the operating side edge region and the local high point determination results of the transmission side edge region are obtained, including:

[0090] Step 7.1: Perform local high point determination on the operating side edge region to obtain a local high point determination result of the operating side edge region;

[0091] Step 7.1.1: Determine the relative thickness of the thickest point on the operating side H OS_max RT Relative thickness to the thickest point of the operating side area H OS_local_max RT Are they equal? ​​If they are equal, the relatively thickest point on the operating side is selected as the first feature point. If they are not equal, the relatively thickest point on the edge of the operating side is selected as the first feature point.

[0092] Step 7.1.2: Determine the relative thickness of the thinnest point on the operating side H OS_minRT Relative thickness of the thinnest point relative to the operating side edge area H OS_local_min RT Are they equal? ​​If they are equal, the point with the thinnest relative thickness in the edge area of ​​the operating side is taken as the second characteristic point. If they are not equal, the point with the thinnest relative thickness in the edge area of ​​the operating side is taken as the second characteristic point;

[0093] Step 7.1.3: Obtain the difference between the relative thickness of the first feature point and the relative thickness of the second feature point to obtain the local high point on the operating side H OS_local , if the local high point on the operating side H OS_local Less than the local high point determination threshold h 1, the local high point determination result of the operating side edge area is that there is no local high point in the operating side edge area. H OS_local Greater than or equal to the local high point determination threshold h 1. Execute step 7.1.4.

[0094] Step 7.1.4: Get the difference between the width of the first feature point and the width of the second feature point l OS_judge ,like l OS_judge Greater than the local high point determination distance threshold l , the local high point determination result of the operation side edge area is that there is no local high point in the operation side edge area. l OS_judge Less than or equal to the local high point determination distance threshold l , execute step 7.1.5;

[0095] Step 7.1.5: Calculate the width of the first feature point and the width of the edge point on the operating side W OS_0 AW The absolute value of the difference between l OS_local , and obtain the local high point determination result of the operating side edge area. At this time, the local high point determination result of the operating side edge area is the distance from the operating side l OS_local There are local high points H OS_local .

[0096] Step 7.2: local high point determination is performed on the transmission side edge region to obtain the local high point determination result of the transmission side edge region;

[0097] Step 7.2.1: Determine the relative thickness of the thickest point on the transmission side H DS_maxRT Relative thickness to the thickest point of the transmission side edge area H DS_local_max RT Are they equal? ​​If they are equal, the relatively thickest point on the transmission side is selected as the third characteristic point. If they are not equal, the relatively thickest point on the edge of the transmission side is selected as the third characteristic point.

[0098] Step 7.2.2: Determine the relative thickness of the thinnest point on the transmission side H DS_min RT Relative thickness of the thinnest point relative to the transmission side edge area H DS_local_min RT Are they equal? ​​If they are equal, the point with the thinnest relative thickness in the edge area of ​​the transmission side is taken as the fourth characteristic point. If they are not equal, the point with the thinnest relative thickness in the transmission side is taken as the fourth characteristic point.

[0099] Step 7.2.3: Obtain the difference between the relative thickness of the third feature point and the relative thickness of the fourth feature point to obtain the local high point on the transmission side H DS_local , if the local high point on the transmission side H DS_local Less than the local high point determination threshold h 1. The local high point determination result of the transmission side edge area is that there is no local high point in the transmission side edge area. H DS_local Greater than or equal to the local high point determination threshold h 1. Execute step 7.2.4.

[0100] Step 7.2.4: Get the difference between the width of the third feature point and the width of the fourth feature point l DS_judge ,like l DS_judge Greater than the local high point determination distance threshold l , the local high point determination result of the transmission side edge area is that there is no local high point in the transmission side edge area. l DS_judge Less than or equal to the local high point determination distance threshold l , execute step 7.2.5;

[0101] Step 7.2.5: Calculate the width of the third feature point and the width of the edge point on the transmission side W DS_0 AW The absolute value of the difference between l DS_local , and the local high point determination result of the transmission side edge area is obtained. At this time, the local high point determination result of the transmission side edge area is the distance from the transmission sidel DS_local There are local high points H DS_local .

[0102] Based on this, the present invention also presets a threshold value for determining the thickness difference between the two sides: h 3;

[0103] Based on this, the final wedge determination result is determined in step 7, including:

[0104] Obtain the target difference between the relative thickness of the first feature point determined in step 7.1.1 and the relative thickness of the third feature point determined in step 7.2.1, and determine the target difference and the thickness difference determination threshold on both sides. h 3, when the target difference is less than the thickness difference judgment threshold on both sides h 3, the wedge determination result is the same as the wedge determination result in step 7; when the target difference is greater than or equal to the thickness difference determination threshold on both sides h In case 3, the wedge shape determination result in step 7 is updated to the actual wedge shape being too large, which may cause the risk of rib formation in the future.

[0105] Step 8: Based on the relative thickness of the feature points, local high points of the center-biased operation side region and the center-biased transmission side region are determined to obtain local high point determination results of the center-biased operation side region and local high point determination results of the center-biased transmission side region;

[0106] Among them, the present invention presets a middle thickness fluctuation threshold h 2;

[0107] The characteristic points also include the center point of the rolled strip W C , the boundary point between the operating side area and the central operating side area E OS The dividing point between the transmission side edge area and the center transmission side area E DS ;

[0108] Based on this, step 8 specifically includes:

[0109] Step 8.1: Use the quadratic curve to calculate the relative thickness of the center point of the rolled strip. W C RT , the relative thickness of the boundary between the operating side area and the central operating side area E OS RT , the relative thickness of the boundary between the transmission side edge area and the center transmission side area E DS RT Perform fitting to obtain the fitting function;

[0110] Step 8.2: Substitute the width of each measurement point in the relative thickness distribution curve into the fitting function to obtain an ideal thickness curve;

[0111] Step 8.3: Subtract the relative thickness of each measuring point in the relative thickness distribution curve from the relative thickness of each measuring point in the ideal thickness curve to obtain the thickness difference corresponding to each measuring point, such as Figure 4 .

[0112] Step 8.4: Determine the thickness difference corresponding to each measurement point and the middle thickness fluctuation threshold h 2, determine the local high point judgment result of the center-biased operation side area and the local high point judgment result of the center-biased transmission side area.

[0113] For the center-biased operating side area, if the thickness differences corresponding to all measurement points in the center-biased operating side area are less than the middle thickness fluctuation threshold h 2, the local high point determination result of the center-biased operation side area is no local high point; if the thickness difference in the center-biased operation side area is greater than or equal to the middle thickness fluctuation threshold h 2, then all the measurement points greater than or equal to the middle thickness fluctuation threshold are obtained. h 2, and all thickness differences greater than or equal to the middle thickness fluctuation threshold h 2, obtaining the maximum value as the first target value, and then obtaining the local high point determination result of the center-biased operation side area, wherein the local high point determination result of the center-biased operation side area is that there is a local high point at the width corresponding to the first target value, and the local high point is the first target value;

[0114] For the center transmission side area, if the thickness difference corresponding to all measurement points in the center transmission side area is less than the middle thickness fluctuation threshold h 2, the local high point determination result of the center-biased transmission side area is no local high point; if the thickness difference in the center-biased transmission side area is greater than or equal to the middle thickness fluctuation threshold h 2, then all the measurement points greater than or equal to the middle thickness fluctuation threshold are obtained. h 2, and all thickness differences greater than or equal to the middle thickness fluctuation threshold h 2, the maximum value is obtained as the second target value, and then the local high point judgment result of the center-eccentric transmission side area is obtained, and the local high point judgment result of the center-eccentric transmission side area is that there is a local high point at the width corresponding to the second target value, and the local high point is the second target value.

[0115] Step 9: According to the width of the cross section, the relative thickness of the cross section, and the convexity Crown , Wedge Wedge,The convexity determination results, wedge determination results, local high point determination results of the operating side edge area, local high point determination results of the transmission side edge area, local high point determination results of the center-biased operating side area and local high point determination results of the center-biased transmission side area generate cross-sectional situation determination information of the width and relative thickness of the rolled strip, and draw a strip cross-sectional thickness distribution diagram, such as Figure 5 .

[0116] Next, we will use actual data to illustrate the above steps:

[0117] Step 1: The width of the rolled strip is B=1272.551mm, and then according to the unit discrete point width Δ x =4mm, determine the measurement points, get 319 measurement points, and then get the thickness distribution curve, that is, Figure 2 Thickness distribution curve of strip cross section;

[0118] Step 2: Determine the two measurement points whose width is closest to the zero point of the horizontal coordinate, and their coordinates are (-1.580, 2694.191) and (2.420, 2694.279), and then the center thickness is 2694.235mm;

[0119] Step 3: Subtract the center thickness from the thickness of each measurement point in the thickness distribution curve to obtain a relative thickness distribution curve, that is, Figure 3 Relative thickness distribution of the strip steel cross section;

[0120] Step 4: The width of the strip is B = 1272.551 mm, and the operating side edge area is determined to be the transmission side edge area;

[0121] Step 5: Determine the feature points, and then obtain the width and thickness of the feature points, as shown in Table 1;

[0122] Table 1 Feature point information

[0123] Feature Points Actual width(AW) / mm RelativeThickness(RT) / μm <![CDATA[ W C ]]> 0 0 <![CDATA[ W OS_0 ]]> 666.42 -125.044 <![CDATA[ W DS_0 ]]> -605.58 -151.472 <![CDATA[ W OS_40 ]]> 626.42 -7.295 <![CDATA[ W DS_40 ]]> -565.58 -36.775 <![CDATA[ H OS_max ]]> 534.42 6.471 <![CDATA[ H DS_max ]]> -197.58 6.052 <![CDATA[ H OS_min ]]> 338.42 -0.778 <![CDATA[ H DS_min ]]> -393.58 -12.329 <![CDATA[ H OS_local_max ]]> 534.42 6.471 <![CDATA[ H DS_local_max ]]> -405.58 -11.971 <![CDATA[ H OS_local_min ]]> 622.42 -6.122 <![CDATA[ H DS_local_min ]]> -565.58 -36.775 <![CDATA[ E OS ]]> 466.42 1.808 <![CDATA[ E DS ]]> -405.58 -11.971

[0124] Among them, Actual width is the actual width, that is, the horizontal coordinate in the relative thickness distribution curve, and RelativeThickness is the relative thickness, that is, the vertical coordinate in the relative thickness distribution curve.

[0125] Set the local high point determination threshold h 1=5μm, middle thickness fluctuation threshold h 2=6μm, the threshold for the thickness difference between the two sides h 3 = 17.5 μm, local high point determination distance threshold l =200mm; convexity determination threshold c 1 = 30 μm,c 2 = 15 μm, wedge judgment threshold w 1=20μm, the threshold here is just for illustration, and can be adjusted according to production requirements during application;

[0126] Step 6: Calculate the crown = 36.77μm and the wedge = -29.48μm. 36.77μm>30μm, so the crown is too large, -29.48μm <- 20μm, the wedge is judged to be too small;

[0127] Step 7: Perform local high point determination on the operating side edge region to obtain a local high point determination result of the operating side edge region;

[0128] Step 7.1.1: H OS_local_max RT = H OS_max RT , select the relatively thickest point on the operating side as the first feature point, select H OS_max RT = 6.471 μm is used for the calculation of the size of local high points;

[0129] Step 7.1.2: H OS_min RT Not equal to H OS_local_min RT , select the point with the thinnest relative thickness on the operating side as the second feature point, and select H OS_min RT =-0.778μm is used for calculation of local high point size;

[0130] Step 7.1.3: Calculation H OS_local = H OS_max RT - H OS _min RT =7.25μm, 7.25μm > 5 μm, proceed to step 7.1.4;

[0131] Step 7.1.4: Calculation l OS_judge = H OS_max AW - H OS_min AW=196mm, 196mm<200mm, proceed to step 7.1.5;

[0132] Step 7.1.5: Calculation l OS_locall =| H OS_max AW - W OS_0 AW |=132mm, it is determined that there is a local high point of 7.25μm at 132mm from the operating side;

[0133] Step 7.2: Determine the transmission side section using the same method as step 7.1. Replace the relevant parameters with the transmission side parameters to determine that there is no local high point on the transmission side.

[0134] In step 7, the final wedge shape determination result is determined, and the target difference is 18 μm, 18 μm>17.5 μm. The wedge shape determination result in step 7 is updated to determine that the actual wedge shape is too large, and there is a risk of ribs in the future;

[0135] Step 8: Based on the relative thickness of the feature points, local high points of the center-biased operation side region and the center-biased transmission side region are determined to obtain local high point determination results of the center-biased operation side region and local high point determination results of the center-biased transmission side region;

[0136] Step 8.1: Use quadratic curve fitting W C RT , E DS RT , E OS RT , the coefficients are shown in Table 2;

[0137] Table 2 Fitting curve coefficients

[0138] coefficient value Quadratic term -4.913359844784537e-05 One-time item 0.012544627927394556 Constant term 5.127900497022838e-16

[0139] Thus, the fitting function is obtained, such as Figure 4 ;

[0140] Step 8.2: Substitute the width of each measurement point in the relative thickness distribution curve into the fitting function to obtain an ideal thickness curve;

[0141] Step 8.3: Subtract the relative thickness of each measuring point in the relative thickness distribution curve from the relative thickness of each measuring point in the ideal thickness curve to obtain the thickness difference corresponding to each measuring point, such as Figure 4 .

[0142] Step 8.4: By Figure 4It can be seen that there is a point where the thickness deviation value of the center-biased transmission side area is greater than 6μm. Record this point and determine whether the center-biased transmission side of the plate strip is H DS_max AW (197.58mm) local high point 6.05μm;

[0143] Step 9: Record the detailed information of the strip cross-section judgment as shown in Table 3. If the information is empty, it means that the judgment of this area is normal. At the same time, the judgment information can be output as follows: Steel type: W1300 (1) Roll number: D482066800 Width: 1272.55mm--Thickness: 2700.44μm; Section index: Crown = 36.77μm, wedge = -29.48μm; Section condition judgment: Crown is too large, the actual wedge is too large, the thickness difference between the two sides is 18μm, the operating side is too thick, and there is a risk of ribs in the future. The center of the strip is 197.58mm away from the transmission side, the local high point is 6.05μm, and there is no abnormality in the middle section of the strip on the operating side. There is no local high point on the transmission side. The local high point is 7.25μm 132.0mm away from the edge of the operating side. At the same time, draw the strip cross-section thickness distribution as shown in the figure below: Figure 5 shown.

[0144] Table 3 Detailed information on determination of strip cross-section conditions

[0145] Production time 10 / 16 / 2024 5:31:55 AM Volume Number D482066800 Steel Type W1300(1) Width / mm 1272.551 Thickness / μm 2700.442 Operating side width / mm 666.42 Transmission side width / mm -605.58 Distance from the high point of the operating side to the edge / mm 132 Distance from the high point of the transmission side to the edge / mm High point size on the operating side / μm 7.249 High point size on transmission side / μm 0.358 Operation side high point determination length / mm 196 Determination length of high point on transmission side / mm 12 Distance from the middle high point to the operating side / mm Distance from the middle high point on the transmission side / mm -197.58 Size of the high point on the operating side of the middle part / μm Size of the high point on the transmission side of the middle part / μm 6.05 Thickness difference between two sides / μm 18.442

[0146] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure to form a technical solution.

Claims

1. A method for determining the quality of a strip cross-section profile, characterized in that: include: Step 1: Obtain a cross section of the width and thickness of the rolled strip, determine a measuring point along the direction of the width of the rolled strip according to a preset width interval, and collect measuring point data corresponding to the measuring point, wherein the measuring point data includes the width and thickness corresponding to the measuring point, obtain the total length of the width of the cross section, determine the value of the center width of the cross section, and construct a thickness distribution curve of the measuring point data based on the measuring point data, using the width as the abscissa, the thickness as the ordinate, and the value of the center width as the zero point of the abscissa; Step 2: According to the thickness distribution curve, determine the two measurement points whose widths are closest to the zero point of the horizontal coordinate, obtain the thickness of the two measurement points, and calculate the average of the thickness of the two measurement points as the center thickness of the rolled plate and strip; Step 3: subtract the center thickness from the thickness of each measuring point in the thickness distribution curve to obtain a relative thickness distribution curve; Step 4: taking the zero point of the horizontal coordinate in the relative thickness distribution curve as the dividing line, taking the area on one side of the zero point of the horizontal coordinate as the operating side, and taking the other side of the zero point of the horizontal coordinate as the transmission side, and then determining the operating side edge area and the center-biased operating side area in the operating side, and determining the center-biased transmission side area and the transmission side edge area in the transmission side according to a preset width threshold; Step 5: Determine characteristic points in the relative thickness distribution curve; Step 6: Calculate the convexity based on the relative thickness of the center thickness and the relative thickness of the feature points Crown and wedge Wedge , and then according to the convexity Crown and wedge Wedge , determine the convexity determination result of the rolled plate and strip and the wedge determination result of the rolled plate and strip; Step 7: Based on the width and relative thickness of the feature points, local high point determination is performed on the operating side edge region and the transmission side edge region to obtain local high point determination results of the operating side edge region and local high point determination results of the transmission side edge region, thereby determining the final wedge determination result; Step 8: Based on the relative thickness of the feature points, local high points of the center-biased operation side region and the center-biased transmission side region are determined to obtain local high point determination results of the center-biased operation side region and local high point determination results of the center-biased transmission side region; Step 9: According to the width of the cross section, the relative thickness of the cross section, and the convexity Crown , Wedge Wedge, The convexity judgment results, wedge shape judgment results, local high point judgment results of the operating side edge area, local high point judgment results of the transmission side edge area, local high point judgment results of the center-biased operating side area and local high point judgment results of the center-biased transmission side area are used to generate cross-sectional judgment information on the width and relative thickness of the rolled strip and draw a cross-sectional thickness distribution diagram of the strip.

2. The method for determining the quality of the strip cross-sectional profile according to claim 1, characterized in that: Preset local high point determination threshold h 1 and the local high point determination distance threshold l ; The feature points include operating side edge points W OS_0 and transmission side edge point W DS_0 , wherein the operating side edge point is the measurement point on the operating side that is farthest from the zero point of the horizontal coordinate in the relative thickness distribution curve, and the transmission side edge point is the measurement point on the transmission side that is farthest from the zero point of the horizontal coordinate in the relative thickness distribution curve; The characteristic points also include the relatively thickest point on the operating side H OS_max , Relatively thickest point on the transmission side H DS_max , the thinnest point on the operating side H OS_min , the thinnest point on the transmission side H DS_min , the relative thickest point of the operating side area H OS_local_max , the relative thickest point of the transmission side edge area H DS_local_max , the relative thickness of the operating side area is the thinnest point H OS_local_min The thinnest point relative to the transmission side edge area H DS_local_min ; Based on this, in step 7, based on the width and relative thickness of the feature points, local high point determination is performed on the operating side edge region and the transmission side edge region, and the local high point determination results of the operating side edge region and the local high point determination results of the transmission side edge region are obtained, including: Step 7.1: Perform local high point determination on the operating side edge region to obtain a local high point determination result of the operating side edge region; Step 7.1.1: Determine the relative thickness of the thickest point on the operating side H OS_max RT Relative thickness to the thickest point of the operating side area H OS_local_max RT Are they equal? ​​If they are equal, the relatively thickest point on the operating side is selected as the first feature point. If they are not equal, the relatively thickest point on the edge of the operating side is selected as the first feature point. Step 7.1.2: Determine the relative thickness of the thinnest point on the operating side H OS_min RT Relative thickness of the thinnest point relative to the operating side edge area H OS_local_min RT Are they equal? ​​If they are equal, the point with the thinnest relative thickness in the edge area of ​​the operating side is taken as the second characteristic point. If they are not equal, the point with the thinnest relative thickness in the edge area of ​​the operating side is taken as the second characteristic point; Step 7.1.3: Obtain the difference between the relative thickness of the first feature point and the relative thickness of the second feature point to obtain the local high point on the operating side H OS_local , if the local high point on the operating side H OS_local Less than the local high point determination threshold h 1, the local high point determination result of the operating side edge area is that there is no local high point in the operating side edge area. H OS_local Greater than or equal to the local high point determination threshold h 1. Execute step 7.1.

4. Step 7.1.4: Get the difference between the width of the first feature point and the width of the second feature point l OS_judge ,like l OS_judge Greater than the local high point determination distance threshold l , the local high point determination result of the operation side edge area is that there is no local high point in the operation side edge area. l OS_judge Less than or equal to the local high point determination distance threshold l , execute step 7.1.5; Step 7.1.5: Calculate the width of the first feature point and the width of the edge point on the operating side W OS_0 AW The absolute value of the difference between l OS_local , and obtain the local high point determination result of the operating side edge area. At this time, the local high point determination result of the operating side edge area is the distance from the operating side l OS_local There are local high points H OS_local； Step 7.2: local high point determination is performed on the transmission side edge region to obtain the local high point determination result of the transmission side edge region; Step 7.2.1: Determine the relative thickness of the thickest point on the transmission side H DS_max RT Relative thickness to the thickest point of the transmission side edge area H DS_local_max RT Are they equal? ​​If they are equal, the relatively thickest point on the transmission side is selected as the third characteristic point. If they are not equal, the relatively thickest point on the edge of the transmission side is selected as the third characteristic point. Step 7.2.2: Determine the relative thickness of the thinnest point on the transmission side H DS_min RT Relative thickness of the thinnest point relative to the transmission side edge area H DS_local_min RT Are they equal? ​​If they are equal, the point with the thinnest relative thickness in the edge area of ​​the transmission side is taken as the fourth characteristic point. If they are not equal, the point with the thinnest relative thickness in the transmission side is taken as the fourth characteristic point. Step 7.2.3: Obtain the difference between the relative thickness of the third feature point and the relative thickness of the fourth feature point to obtain the local high point on the transmission side H DS_local , if the local high point on the transmission side H DS_local Less than the local high point determination threshold h 1. The local high point determination result of the transmission side edge area is that there is no local high point in the transmission side edge area. H DS_local Greater than or equal to the local high point determination threshold h 1. Execute step 7.2.

4. Step 7.2.4: Get the difference between the width of the third feature point and the width of the fourth feature point l DS_judge ,like l DS_judge Greater than the local high point determination distance threshold l , the local high point determination result of the transmission side edge area is that there is no local high point in the transmission side edge area. l DS_judge Less than or equal to the local high point determination distance threshold l , execute step 7.2.5; Step 7.2.5: Calculate the width of the third feature point and the width of the edge point on the transmission side W DS_0 AW The absolute value of the difference between l DS_local , and the local high point determination result of the transmission side edge area is obtained. At this time, the local high point determination result of the transmission side edge area is the distance from the transmission side l DS_local There are local high points H DS_local .

3. The method for determining the quality of the strip cross-sectional profile according to claim 2, characterized in that: Preset threshold for thickness difference between two sides h 3; Based on this, the final wedge determination result is determined in step 7, including: Obtain the target difference between the relative thickness of the first feature point determined in step 7.1.1 and the relative thickness of the third feature point determined in step 7.2.1, and determine the target difference and the thickness difference determination threshold on both sides. h 3, when the target difference is less than the thickness difference judgment threshold on both sides h In the case of 3, the wedge determination result is the same as the wedge determination result in step 7; When the target difference is greater than or equal to the thickness difference judgment threshold on both sides h In case 3, the wedge shape determination result in step 7 is updated to the actual wedge shape being too large, which may cause the risk of rib formation in the future.

4. The method for determining the quality of the strip cross-sectional profile according to claim 1, characterized in that: Preset middle thickness fluctuation threshold h 2; The characteristic points also include the center point of the rolled strip W C , the boundary point between the operating side area and the central operating side area E OS The dividing point between the transmission side edge area and the center transmission side area E DS ; Based on this, step 8 specifically includes: Step 8.1: Use the quadratic curve to calculate the relative thickness of the center point of the rolled strip. W C RT , the relative thickness of the boundary between the operating side area and the central operating side area E OS RT , the relative thickness of the boundary between the transmission side edge area and the center transmission side area E DS RT Perform fitting to obtain the fitting function; Step 8.2: Substitute the width of each measurement point in the relative thickness distribution curve into the fitting function to obtain an ideal thickness curve; Step 8.3: Subtract the relative thickness of each measuring point in the relative thickness distribution curve from each relative thickness in the ideal thickness curve to obtain the thickness difference corresponding to each measuring point; Step 8.4: Determine the thickness difference corresponding to each measurement point and the middle thickness fluctuation threshold h 2, determine the local high point judgment result of the center-biased operation side area and the local high point judgment result of the center-biased transmission side area.

5. The method for determining the quality of the strip cross-sectional profile according to claim 4, characterized in that: Step 8.4 specifically includes: For the center-biased operating side area, if the thickness differences corresponding to all measurement points in the center-biased operating side area are less than the middle thickness fluctuation threshold h 2, the local high point determination result of the center-biased operation side area is no local high point; if the thickness difference in the center-biased operation side area is greater than or equal to the middle thickness fluctuation threshold h 2, then all the measurement points greater than or equal to the middle thickness fluctuation threshold are obtained. h 2, and all thickness differences greater than or equal to the middle thickness fluctuation threshold h 2, obtaining the maximum value as the first target value, and then obtaining the local high point determination result of the center-biased operation side area, wherein the local high point determination result of the center-biased operation side area is that there is a local high point at the width corresponding to the first target value, and the local high point is the first target value; For the center transmission side area, if the thickness difference corresponding to all measurement points in the center transmission side area is less than the middle thickness fluctuation threshold h 2, the local high point determination result of the center-biased transmission side area is no local high point; if the thickness difference in the center-biased transmission side area is greater than or equal to the middle thickness fluctuation threshold h 2, then all the measurement points greater than or equal to the middle thickness fluctuation threshold are obtained. h 2, and all thickness differences greater than or equal to the middle thickness fluctuation threshold h 2, the maximum value is obtained as the second target value, and then the local high point judgment result of the center-eccentric transmission side area is obtained, and the local high point judgment result of the center-eccentric transmission side area is that there is a local high point at the width corresponding to the second target value, and the local high point is the second target value.

6. The method for determining the quality of the strip cross-section profile according to claim 1, characterized in that: Preset convexity judgment threshold c 1. Convexity determination threshold c 2. Wedge determination threshold w 1; Based on this, in step 6, according to the convexity Crown and wedge Wedge , determine the convexity determination result of the rolled strip and the wedge determination result of the rolled strip, including: Based on convexity Crown , convexity judgment threshold c 1 and convexity threshold c 2. Determine the convexity determination result of the rolled strip, including: like Crown > c 1, then the convexity judgment result is that the convexity of the rolled strip is too large. Crown <c 2, the convexity determination result is that the convexity of the rolled strip is too small. c 1 <Crown<c 21 , then the convexity determination result is that the convexity meets the standard; Based on wedge Wedge and wedge determination threshold w 1. Determine the wedge shape determination result of the rolled strip, including: like Wedge > w 1, the wedge shape judgment result is that the wedge shape of the rolled strip is too large. If 0 <Wedge<w 1, then the wedge shape determination result is that the rolled strip is a positive wedge shape. If - w 1 <Wedge< 0, the wedge shape determination result is that the rolled strip is a negative wedge shape. Wedge<-w 1, the wedge shape judgment result is that the wedge shape of the rolled plate and strip is too small.

7. The method for determining the quality of the strip cross-sectional profile according to claim 1, characterized in that: The characteristic points also include the operating side convexity and wedge calculation points W OS_40 , transmission side crown and wedge calculation points W DS_40 , where the operating side convexity and wedge calculation point W OS_40 The measuring point on the operating side that is the first threshold away from the zero point of the horizontal coordinate in the relative thickness distribution curve, the convexity and wedge calculation point on the transmission side W OS_40 is a measuring point on the transmission side that is at a first threshold distance from the zero point of the abscissa in the relative thickness distribution curve; Based on this, in step 6, the convexity is calculated based on the relative thickness of the center thickness and the relative thickness of the feature points. Crown and wedge Wedge , and then according to the convexity Crown and wedge Wedge , including: Calculate the relative thickness of the center thickness with the operating side convexity and wedge calculation points W OS_40 The relative thickness difference is obtained to obtain the first difference, and the relative thickness of the center thickness is calculated with the transmission side convexity and wedge calculation point W DS_40 The relative thickness difference is obtained to obtain the second difference, and the average of the first difference and the second difference is obtained to obtain the convexity of the rolled strip. Crown ; The transmission side crown and wedge calculation points W DS_40 Relative thickness minus the operating side convexity and wedge calculation point W OS_40 The relative thickness of the rolled strip is obtained by Wedge .

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