阅读说明：本技术 改进的边部断面形状的同板差控制方法 (Improved same-plate difference control method for edge section shape ) 是由 曾建峰 李红梅 周毅 卢勇 于 2019-09-29 设计创作，主要内容包括：本发明公开了一种改进的边部断面形状的同板差控制方法,在现有控制过程中,在距离边部15mm位置点W-(15)的厚度H-(15)与中心厚度H-c的差值在同板差控制阈值区间内的条件下,增加补充控制方法,包括步骤S1：选定边部15mm位置点W-(15)外的位置点W-(边部),检测W-(边部)处厚度H-(边部)；步骤S2：以H-(15)为厚度基准值,计算H-(边部)与H-(15)的差值；步骤S3：判断差值是否大于标准阈值X,若是则返回步骤1,若否则执行步骤S4；步骤S4：判断同板差控制手段是否已全部投入,若是则返回步骤1,若否则执行步骤S5；步骤S5：周期性提高同板差补充控制手段的投入程度至差值小于X,并返回步骤1。本发明能对边部15mm外位置处的同板差进行自动反馈控制,提高实物质量水平,减少使用异常。(The invention discloses an improved same-plate difference control method for the section shape of an edge part, which is characterized in that in the existing control process, a point W is arranged at a position 15mm away from the edge part 15 Thickness H of 15 And center thickness H c Under the condition that the difference value of the same board difference is within the same board difference control threshold value interval, adding a supplementary control method, comprising the step S1: selecting a 15mm position point W of the edge 15 Outer position point W Edge part Detecting W Edge part Thickness H Edge part (ii) a Step S2: with H 15 For the thickness reference value, calculate H Edge part And H 15 A difference of (d); step S3: judging whether the difference value is larger than a standard threshold value X, if so, returning to the step 1, otherwise, executing the step S4; step S4: judging whether the same-plate difference control means is completely put into use, if so, returning to the step 1, otherwise, executing the step S5; step S5: and (5) periodically improving the input degree of the same-plate difference compensation control means until the difference value is smaller than X, and returning to the step 1. The invention can automatically feed back and control the same plate difference at the position 15mm outside the edge part, improve the quality level of a real object and reduce the useAnd (6) abnormal.)

1. An improved same-plate difference control method for edge section shapes comprises the following steps:

step 1: starting the same plate difference control process;

step 2: collecting position points W with the distance of 15mm from the edge part₁₅Thickness H of the strip₁₅And the center thickness H of the strip_cPeriodically calculating the position point W15 mm away from the edge part₁₅Thickness H of₁₅And center thickness H_cA difference of (d);

and step 3: judging the position point W15 mm away from the edge₁₅Thickness H of₁₅And center thickness H_cWhether the difference value of (1) is within the same-plate difference control threshold interval or not;

i) if the distance W is 15mm from the edge₁₅Thickness H of₁₅And center thickness H_cIf the difference value of the step (2) is within the same plate difference control threshold value interval, returning to the step (1);

ii) point W at a distance of 15mm from the edge₁₅Thickness H of₁₅And center thickness H_cIf the difference value is larger than the upper limit of the same-plate difference control threshold interval, executing the step 4;

iii) point W if it is 15mm from the edge₁₅Thickness H of₁₅And center thickness H_cIf the difference value of (2) is less than the lower limit of the same-plate difference control threshold interval, executing step (5);

and 4, step 4: reducing the input degree of the same-plate difference control means, and returning to the step 1;

and 5: judging whether the same-plate difference control means are all put into use, if so, returning to the step 1, and if not, executing the step 6;

step 6: improving the input degree of the same-plate difference control means, and returning to the step 1;

the method is characterized in that: at a point W15 mm from the edge₁₅Thickness H of₁₅And center thickness H_cUnder the condition that the difference value of the control threshold value interval is within the same plate difference control threshold value interval, a supplementary control method is added.

The supplementary control method comprises the following steps:

step S1: in each calculation cycle, a 15mm position point W of the edge is selected₁₅Outer position point W_{Edge part}Detecting the position point W_{Edge part}Thickness H of strip steel_{Edge part}And position point W_{Edge part}15mm from the edge₁₅Is positioned at the same side of the strip steel;

step S2: with 15mm position point W of the edge₁₅Thickness H of₁₅Calculating the same side position point W as the thickness reference value_{Edge part}Thickness H of_{Edge part}And a thickness reference value H₁₅A difference of (d);

step S3: judging whether the difference value is larger than a standard threshold value X, if so, returning to the step 1, and if not, executing the step S4;

step S4: judging whether the same-plate difference control means is completely put into the device, if so, returning to the step 1, otherwise, executing the step S5;

step S5: and (5) periodically improving the input degree of the same-plate difference compensation control means until the difference value is smaller than the standard threshold value X, and returning to the step 1.

2. The improved homogeneous plate difference control method of edge section shape as set forth in claim 1, wherein: the position point W_{Edge part}The distance between the edge part and the edge part is not less than 5mm and not more than W_{Edge part}＜15mm。

3. The improved homogeneous plate difference control method of edge section shape as set forth in claim 1 or 2, wherein: the position point W_{Edge part}Taking 5mm position points W of the edges at two sides of the strip steel₅Edge 7mm position point W₇10mm position point W of edge₁₀12mm position point W of edge₁₂。

4. The improved homogeneous plate difference control method of edge section shape as set forth in claim 1, wherein: the value range of the standard threshold value X is as follows:

15mm position point W₁₅The value range of the standard threshold value X is that X is 0 μm;

14mm position point W₁₄The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-3 mu m;

13mm position point W₁₃The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-3 mu m;

12mm position point W₁₂The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-5 mu m;

11mm position point W₁₁The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-5 mu m;

10mm position point W₁₀The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-5 mu m;

9mm position point W₉The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-6 mu m;

8mm position point W₈The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-7 mu m;

7mm position point W₇Standard threshold of (2)The value range of X is more than or equal to 0 μm and more than or equal to-8 μm;

6mm position point W₆The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-9 mu m;

5mm position point W₅The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-10 mu m.

5. The improved homogeneous plate difference control method of edge section shape as set forth in claim 1, wherein: the same-plate difference compensation control means comprises the working roll shifting and the increase of the bending value of the working roll.

6. The improved homogeneous plate difference control method of edge section shape as set forth in claim 1 or 5, wherein: the input logic of the same-plate difference compensation control means is as follows: firstly, the working roll shifting is executed, and then the roll bending value of the working roll is increased.

7. The improved homogeneous plate difference control method of edge section shape as set forth in claim 1, wherein: while the supplementary control means is put in, a point W of 15mm is positioned₁₅Thickness H₁₅The control program still operates normally according to the steps 1 to 6, namely if the position point W is paired_{Edge part}Results in a 15mm position point W during supplementary control of the thickness₁₅Thickness H of₁₅Greater than the center thickness H_cThe system reduces the input level of the same-plate difference control means for the transmission signal.

Technical Field

The invention relates to a control method in a metallurgical machinery/pickling rolling process, in particular to an improved same plate difference control method for edge section shapes.

Background

Edge Drop (Edge Drop, also called Edge Drop) of electrical steel sheets is an important parameter for the dimensions of electrical steel sheets. Because the electrical steel plates need to be laminated after being stamped, if the edge of the steel plate is excessively reduced, the stamped silicon steel plates are regularly thick at one side and thin at the other side, and the laminated stator and rotor have great size deviation, so that the winding of a coil and the efficiency of a motor are influenced. Therefore, the edge drop accuracy (same-plate difference accuracy) is an important dimension index of the electrical steel plate, and users have strict requirements on the edge drop index of the electrical steel plate.

The conventional definition of edge drop is the position W of 100mm from the edge₁₀₀Thickness (H) of₁₀₀) Minus the position W of 15mm from the edge₁₅Thickness (H) of₁₅) However, as the product quality requirement is continuously improved, the traditional edge drop definition is difficult to meet the requirement, and often, when the control level of the traditional edge drop completely meets the unit control requirement, the requirement of the user on the section shape still cannot be met. Therefore, the edge drop concept of the cold rolling unit for producing electrical steel products with the highest edge drop requirement at present is expanded to the same plate difference, namely the central point W of the strip steel_cThickness H_CMinus the position W of 15mm from the edge₁₅Thickness H of₁₅Difference of (i.e. same plate difference (edge drop) ═ H)_C－H₁₅。

In the prior art, control programs of the same plate difference are all carried out by adopting a feedback control system, and the main control idea is to use a working roller or a middle roller with a chamfer or a special arc to compensate the edge thinning area by the feedback control system so as to reduce the edge reduction value. However, no matter the mode of feedback or feedforward is adopted, the idea is to take the thickness of the central point as the reference and the thickness of the edge fixing position (the thickness H at the position 15mm away from the edge is taken in the current general cold rolling process)₁₅) And a center point thickness H_cIs controlled on the basis of the relative difference value, and can meet the requirement after unilateral shearing of 10-15mmThe quality requirement of the user for the steel plate. However, with the increasing requirements of users and the rising of cost consciousness, the trimming amount of the steel plate is reduced to about 5-7mm, the same plate difference problem of the area which is exposed in the use process and is 5mm to 15mm away from the edge part is increased remarkably, and the normal use is seriously influenced.

The control of the same plate difference of the cold rolling edge is carried out on the basis of the abnormal hot rolling incoming material, the reason that the position 15mm away from the edge is selected as the reference point under the current cold rolling process condition is that the existing hot rolling control process at the position is relatively stable, and if the positions, such as 12mm, 10mm and the like, closer to the edge are selected as the reference points, the fluctuation of the control process can be overlarge to cause unstable system operation, so the same plate difference of the positions of the edges, which are more than 15mm, can not be effectively controlled in the original control mode.

The Chinese patent ZL200810041688.2 discloses a strip steel edge drop control method of a continuous rolling mill, which comprises the following control steps: a. installing an edge drop instrument in front of the continuous rolling mill; b. when the strip steel passes through the edge drop instrument, the PLC determines a sampling length according to the position of the edge drop instrument in the length of the whole roll of strip steel, the edge drop instrument collects strip steel edge drop data of two side parts in the sampling length, a preset value of the shifting position of a shifting working roll of the continuous rolling mill in the sampling length is calculated, and the value is stored; thus, after the PLC finishes determining a sampling length and calculating and storing the preset value of the play position in the sampling length, the PLC finishes determining the next sampling length and calculating and storing the preset value of the play position in the next sampling length in sequence; c. when each sampling length passes through the shifting working roll of the continuous rolling mill, the PLC controls the shifting working roll to shift on the strip steel within the sampling length according to the preset shifting position value within the sampling length. Although the method realizes the high-precision control of the strip steel edge drop, the method mainly adopts the control principle of the strip steel edge drop and reduces the edge drop value, namely H, by using a roller moving mode₁₅To H₁₀₀The edge drop value of (2) does not relate to a method for optimizing the difference between the position of the outer edge of 15mm and the position of the same plate in the process.

The Chinese utility model patent ZL200820059052.6 discloses a working roll for controlling the edge drop of strip steel, the roll shape of the working roll consists of three sections of curves, and the roll shape at the middle section is a straight line; one side is in the shape of an arc roller, the derivative of the arc curve of the roller-shaped curve at the intersection point of the arc and the straight line is zero, namely the roller-shaped curve of the working roller at the side is a smooth curve, the arc roller line is used for controlling the edge drop of the strip steel, and the arc enters the edge of the strip steel; the other side is in a circular arc roller shape or a linear taper angle roller shape and is used for reducing or eliminating a harmful contact area, and the circular arc roller line or the linear roller line does not enter the strip steel; the roll shape directions of the upper working roll and the lower working roll are opposite, namely, the roll line at the driving end side of the upper working roll is at the operation end side of the lower working roll, and the roll line at the operation end side of the upper working roll is at the driving end side of the lower working roll. This working roll needs to realize through effectual control process that the band steel limit falls, and prior art's control process can't optimize the same board difference of 15mm outer more limit portion position.

Disclosure of Invention

The invention aims to provide an improved same-plate difference control method for the section shape of an edge part, which can automatically feedback and control the same-plate difference at the position 15mm away from the edge part by analyzing the edge drop control process, improve the quality level of a real object and reduce the abnormity of a user in the use process.

The invention is realized by the following steps:

an improved same-plate difference control method for edge section shapes comprises the following steps:

step 1: starting the same plate difference control process;

step 2: collecting position points W with the distance of 15mm from the edge part₁₅Thickness H of the strip₁₅And the center thickness H of the strip_cPeriodically calculating the position point W15 mm away from the edge part₁₅Thickness H of₁₅And center thickness H_cA difference of (d);

and step 3: judging the position point W15 mm away from the edge₁₅Thickness H of₁₅And center thickness H_cWhether the difference value of (1) is within the same-plate difference control threshold interval or not;

i) if the distance W is 15mm from the edge₁₅Thickness H of₁₅And center thickness H_cIf the difference value of the step (2) is within the same plate difference control threshold value interval, returning to the step (1);

ii) point W at a distance of 15mm from the edge₁₅Thickness H of₁₅And center thickness H_cIf the difference value is larger than the upper limit of the same-plate difference control threshold interval, executing the step 4;

iii) point W if it is 15mm from the edge₁₅Thickness H of₁₅And center thickness H_cIf the difference value of (2) is less than the lower limit of the same-plate difference control threshold interval, executing step (5);

and 4, step 4: reducing the input degree of the same-plate difference control means, and returning to the step 1;

and 5: judging whether the same-plate difference control means are all put into use, if so, returning to the step 1, and if not, executing the step 6;

step 6: improving the input degree of the same-plate difference control means, and returning to the step 1;

at a point W15 mm from the edge₁₅Thickness H of₁₅And center thickness H_cUnder the condition that the difference value of the control threshold value interval is within the same plate difference control threshold value interval, a supplementary control method is added.

The supplementary control method comprises the following steps:

step S1: in each calculation cycle, a 15mm position point W of the edge is selected₁₅Outer position point W_{Edge part}Detecting the position point W_{Edge part}Thickness H of strip steel_{Edge part}And position point W_{Edge part}15mm from the edge₁₅Is positioned at the same side of the strip steel;

step S2: with 15mm position point W of the edge₁₅Thickness H of₁₅Calculating the same side position point W as the thickness reference value_{Edge part}Thickness H of_{Edge part}And a thickness reference value H₁₅A difference of (d);

step S3: judging whether the difference value is larger than a standard threshold value X, if so, returning to the step 1, and if not, executing the step S4;

step S4: judging whether the same-plate difference control means is completely put into the device, if so, returning to the step 1, otherwise, executing the step S5;

step S5: and (5) periodically improving the input degree of the same-plate difference compensation control means until the difference value is smaller than the standard threshold value X, and returning to the step 1.

The position point W_{Edge part}The distance between the edge part and the edge part is not less than 5mm and not more than W_{Edge part}＜15mm。

The position point W_{Edge part}Taking 5mm position points W of the edges at two sides of the strip steel₅Edge 7mm position point W₇10mm position point W of edge₁₀12mm position point W of edge₁₂。

The value range of the standard threshold value X is as follows:

15mm position point W₁₅The value range of the standard threshold value X is that X is 0 μm;

14mm position point W₁₄The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-3 mu m;

13mm position point W₁₃The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-3 mu m;

12mm position point W₁₂The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-5 mu m;

11mm position point W₁₁The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-5 mu m;

10mm position point W₁₀The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-5 mu m;

9mm position point W₉The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-6 mu m;

8mm position point W₈The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-7 mu m;

7mm position point W₇The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-8 mu m;

6mm position point W₆The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-9 mu m;

5mm position point W₅The value range of the standard threshold value X is more than or equal to 0 mu m and more than or equal to-10 mu m.

The same-plate difference compensation control means comprises the working roll shifting and the increase of the bending value of the working roll.

The input logic of the same-plate difference compensation control means is as follows: firstly, the working roll shifting is executed, and then the roll bending value of the working roll is increased.

While the supplementary control means is put in, a point W of 15mm is positioned₁₅Thickness H₁₅The control program still operates normally according to the steps 1 to 6, namely if the position point W is paired_{Edge part}Results in a 15mm position point W during supplementary control of the thickness₁₅Thickness H of₁₅Greater than the center thickness H_cThe system reduces the input level of the same-plate difference control means for the transmission signal.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention improves the existing edge drop control process, takes the 15mm position point of the edge part as a reference, carries out secondary supplementary control on the same plate difference of the position points outside 15mm, particularly between 5mm and 15mm, the 15mm position point of the edge part still executes the original control program, the control pertinence of the same plate difference of the position point of the edge part is strong, and the control program runs stably.

2. The invention makes up the blank of the same-plate difference control problem of the 15mm outer position point in the prior art, effectively improves the quality level of the material object, reduces the abnormity in the use process of the material object, reduces the unilateral shearing amount and reduces the production cost.

3. The invention has good reference value for cold rolling units which use the roller movement mode to carry out same plate difference control, can also be used for guiding a same plate difference control program model in the design stage of a rolling mill, and has wide application prospect.

The invention carries out compensation control on the same-plate difference condition of the position point outside 15mm of the edge part, particularly between 5mm and 15mm based on the original method 15mm position reference point program by analyzing the edge drop control process, has stable operation, and can carry out targeted control when the incoming material is abnormal by a supplementary control means, thereby ensuring the effective control of the abnormal roll section, improving the quality level of the material object, reducing the abnormality in the use process of a user and obviously improving the satisfaction degree of the user.

Drawings

FIG. 1 is a flow chart of a prior art iso-plate control method of edge profile shape;

FIG. 2 is a flow chart of the improved edge profile contour deviation control method of the present invention.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

Referring to fig. 1, a method for controlling a cross-sectional shape of an edge portion of a conventional plate difference includes the following steps:

step 1: the same plate difference control process is started.

Step 2: collecting position points W with the distance of 15mm from the edge part₁₅Thickness H of the strip₁₅And the center thickness H of the strip_cPeriodically calculating the position point W15 mm away from the edge part₁₅Thickness H of₁₅And center thickness H_cWherein the calculation period is generally 0.5s to 5s, preferably 1 s. At H₁₅When the voltage is larger or smaller, the signal output of the same-plate difference control program is triggered.

And step 3: judging the position point W15 mm away from the edge₁₅Thickness H of₁₅And center thickness H_cWhether the difference value of (a) is within the same-plate difference control threshold interval.

i) If the distance W is 15mm from the edge₁₅Thickness H of₁₅And center thickness H_cIf the difference value is within the same plate difference control threshold value interval, the step 1 is returned.

ii) point W at a distance of 15mm from the edge₁₅Thickness H of₁₅And center thickness H_cIf the difference is larger than the upper limit of the same-plate difference control threshold interval, step 4 is executed.

iii) point W if it is 15mm from the edge₁₅Thickness H of₁₅And center thickness H_cIf the difference value is smaller than the lower limit of the same-plate difference control threshold interval, step 5 is executed.

And 4, step 4: and (3) reducing the input degree of the same-plate difference control means, namely reducing the work roll movement or/and increasing the roll bending value of the work roll, and returning to the step 1.

And 5: and (4) judging whether the same-plate difference control means is completely put into the process, if so, returning to the step 1, and if not, executing the step 6.

Step 6: and (5) increasing the input degree of the same-plate difference control means, and returning to the step 1.

During the same plate difference control process of cold rolled products, corresponding threshold value intervals are set, and the central point W of the strip steel is used_cFor example, a product having a target thickness of 500 μm, at a 15mm position point W under the existing control process₁₅Target thickness of (2) is generally 495 μm & lt, H₁₅Less than or equal to 500 μm (target value interval is about 1% of the central point thickness of 500 μm), i.e., when the control means is put in, if 15mm position point W₁₅Thickness H of₁₅If the thickness of the side part is more than 500 mu m, the control is over (the thickness of the side part is more than that of the central point, the abnormity of the cold rolling production process is caused), and at the moment, a feedback signal is sent, so that the input degree of a control means is reduced. If 15mm position point W₁₅Thickness H of₁₅If the value is less than 495 mu m, the control target is not reached, and at the moment, a feedback signal is sent to improve the input degree of the control means. When the position point W is₁₅Thickness H of₁₅H is more than or equal to 495 mu m₁₅When the value is less than or equal to 500 mu m, the target interval is reached, and the program performs normal measurement and circulates but does not output a control signal.

The existing control process is that a position point W is arranged in the cold rolling production process₁₅Thickness H of₁₅The control target is achieved, the use requirement of the user can be met, but the position point is more edge, such as W₁₂、W₁₀The equal position points are not controlled in a targeted manner. Thickness of position point and position point W of normal thickness curled portion₁₅Thickness H of₁₅The steel plate is a normal section coil after the cold rolling of the conventional section of the hot rolling incoming material, but the thickness of the position point of the edge rolling part with abnormal thickness and the position point W₁₅Thickness H of₁₅The abnormal cross section of the hot rolled incoming material is a poor coil after cold rolling, and the defect is shown in table 1.

TABLE 1 data of thickness of cold rolled edge part in case of different edge part cross-sections of hot rolled incoming material

Location point	W10	W12	W15	W100	WC	W100	W15	W12	W10
										Roll of normal thickness	494	495	496	498	500	498	496	495	494
Roll of abnormal thickness	491	493	496	498	500	498	496	493	491

Because the existing control process uses a point W at a distance of 15mm from the edge part₁₅Thickness H of₁₅With the strip steel central point W_cCenter thickness H of_cIs controlled based on the difference value of (A) at a position point W in the abnormal thickness roll₁₅Thickness H of₁₅When the target value range is reached, the control means is not further invested, and the problem of the position point (such as W) of the edge part outside 15mm cannot be solved₁₀、W₁₂) The thickness of the substrate.

Referring to FIG. 2, an improved method for controlling the cross-sectional shape of an edge portion of a sheet of steel at a point W15 mm from the edge portion₁₅Thickness H of₁₅And center thickness H_cIs within the same-plate-difference control threshold interval, i.e. when the condition i of step 3 is satisfied, the supplementary control method is added.

The supplementary control method comprises the following steps:

step S1: in each calculation cycle, a 15mm position point W of the edge is selected₁₅Outer position point W_{Edge part}Detecting the position point W_{Edge part}Thickness H of strip steel_{Edge part}And position point W_{Edge part}15mm from the edge₁₅Is positioned at the same side of the strip steel. The period of the supplementary control method is consistent with the calculation period of the original same-plate difference control process.

The position point W_{Edge part}The distance between the edge part and the edge part is not less than 5mm and not more than W_{Edge part}Less than 15mm, so that the position point W_{Edge part}15mm position point W of side part₁₅Closer to the edge, but too small(e.g., < 5mm) this results in large fluctuations in the control process.

Preferably, the position point W_{Edge part}Taking the 5mm position points W of the edges at two sides of the strip steel₅Edge 7mm position point W₇10mm position point W of edge₁₀12mm position point W of edge₁₂. For measurements at positions more to the edge than 5mm, severe fluctuations are present and are not considered in the present method to ensure the stability of the overall program run.

Step S2: with 15mm position point W of the edge₁₅Thickness H of₁₅Calculating the same side position point W as the thickness reference value_{Edge part}Thickness H of_{Edge part}And a thickness reference value H₁₅The difference of (a).

Step S3: and judging whether the difference value is larger than the standard threshold value X, if so, returning to the step 1, and if not, executing the step S4. At a 12mm position point W₁₂Thickness H₁₂For example, when H₁₂Minus H₁₅When the difference (because the position point W distinguishes two sides of the strip steel, the relative ratio of the same side in the position point W) is less than-5 mu m (for example, -6 mu m), the 12mm position point W is shown₁₂Thickness H of strip steel₁₂The thickness of the defect is extremely small, and the same-plate difference compensation control means is necessary to be added.

Preferably, the value range of the standard threshold X is shown in table 2:

TABLE 2 location points W_{Edge part}Value range of standard threshold value X

Position point WEdge partDistance from edge	Value range of standard threshold value X
		15mm	X＝0μm
14mm	0μm≥X≥-3μm
		13mm	0μm≥X≥-3μm
12mm	0μm≥X≥-5μm
		11mm	0μm≥X≥-5μm
10mm	0μm≥X≥-5μm
		9mm	0μm≥X≥-6μm
8mm	0μm≥X≥-7μm
		7mm	0μm≥X≥-8μm
6mm	0μm≥X≥-9μm
		5mm	0μm≥X≥-10μm

Step S4: it is determined whether or not the on-board difference control means has been put in its entirety, and if so, the supplementary control is disabled, the process returns to step 1, and if not, step S5 is executed.

Step S5: and (5) periodically improving the input degree of the same-plate difference compensation control means until the difference value is smaller than the standard threshold value X, and returning to the step 1. The period for increasing the input level of the same-plate difference compensation control means should also coincide with the calculation period in step 2.

The same-plate difference compensation control means comprises the steps of working roll movement and increasing the roll bending value of the working roll, and preferably, the input logic of the same-plate difference compensation control means is as follows: firstly, the working roll shifting is executed, and then the roll bending value of the working roll is increased. The work roll movement can respectively carry out targeted control on both sides of the strip steel, and the roll bending value of the work roll is increased to simultaneously control both sides of the strip steel.

While the supplementary control means is put in, a point W of 15mm is positioned₁₅Target thickness H₁₅All control standards (i.e. step 1 to step 6) of the related original control program are still normally operated, i.e. if a supplementary control means is put into operation for the position point W of the more edge part_{Edge part}Resulting in a 15mm position point W during thickness control₁₅Thickness H of₁₅Greater than the center thickness H_cThe system will send signal and the input degree of the same-board difference control means will be reduced.

Example 1:

in this embodiment, the center thickness H of the strip steel_cSelecting the 15mm position points W of the two side edges of the strip steel at 500 mu m₁₅Thickness H of₁₅Is a thickness reference value, namely 495 mu m & lt, H₁₅Less than or equal to 500 mu m, namely-5 mu m less than or equal to H₁₅-H_C≤0μm。

The same plate difference control program is operated to collect the 15mm position points W of the edge parts at the two sides of the strip steel₁₅Thickness H of₁₅Are all 497 μm, and the 15mm position point W of the edge part is calculated₁₅Thickness H of₁₅The thickness H of the center of the strip steel_cDifference of (A), H₁₅-H_C-3 μm, H is satisfied at-5 μm ≦ H₁₅-H_CLess than or equal to 0 μm, and entering the supplementary control process without outputting new command.

Detecting to obtain a 10mm position point W of the edge part₁₀Thickness H of₁₀493 μm, edge 10mm position point W, see Table 2₁₀The standard threshold should satisfy X ≧ 5 μm, in this embodiment, the standard threshold is takenX is-3 μm. H₁₀-H₁₅X is 4 μm & lt, i.e. position point W₁₀And position point W₁₅Is out of the range of the standard threshold value X, indicating the 10mm position point W of the edge part₁₀Thickness H of₁₀The abnormality is thin, and it is necessary to increase the level of investment in the same-plate-difference control means to determine the abnormality of the end face of the end portion.

The same plate difference control means are totally two: one is the movement of the working roll, the maximum value of the movement of the working roll in the embodiment is 105mm, the other is the bending value of the working roll, and the maximum value of the bending value of the working roll in the embodiment is 1% of the rolling force (the rolling force is 1200 tons, so the maximum value of the bending roll is 12 tons). The input logic of the same-plate difference control means is as follows: and firstly, executing the working roll movement to reach the maximum, and if the control target still can not be reached under the condition, increasing the roll bending value. Each calculation period is 3s, and if the control target is not reached in each period, a work roll shifting value moving signal is sent once (1 mm/time) or a roll bending value rising signal is sent once (0.1 ton/time).

And performing systematic calculation on the input condition of the same-plate difference control means, wherein the working roll shifting value operating side is 89mm (the maximum value is 105mm), the transmission side is 93mm (the maximum value is 105mm), and the working roll bending value is 10 tons (the maximum value is 12 tons). Because the roll bending and the movement do not reach the upper input limit, the method has the condition of inputting the same-plate difference compensation program.

And triggering the working roll to move (1 mm/time) according to the system logic, wherein the calculation period is 3 seconds, and at the moment, the system analyzes the whole section data according to the period of 3 seconds and triggers corresponding conditions according to actual conditions. Through the operation of 3 periods, the working roll movement value reaches the level of 92mm, and H is at the moment_C500 μm, 15mm lateral point W₁₅Thickness H of₁₅498 mu m and 10mm edge point W₁₀Thickness H of₁₀496 μm, at which time H₁₀-H₁₅And (2) the control level is-2 mu m, and the logic returns to the same plate difference control initial program to continue running.

Example 2:

in this embodiment, the center thickness H of the strip steel_cSelecting a 15mm position point W of the edge part at 500 μm₁₅Thickness H of₁₅Is a thicknessReference value, i.e. 495 μm ≦ H₁₅Less than or equal to 500 mu m, namely-5 mu m less than or equal to H₁₅-H_C≤0μm。

The same plate difference control program is operated to collect the 15mm position points W of the edge parts at the two sides of the strip steel₁₅Thickness H of₁₅Each having a thickness of 496 μm, and calculating a 15mm side point W₁₅Thickness H of₁₅The thickness H of the center of the strip steel_cDifference of (A), H₁₅-H_CH is equal to-4 mu m and satisfies-5 mu m and less than or equal to H₁₅-H_CLess than or equal to 0 μm, and entering the supplementary control process without outputting new command.

Detecting to obtain a 12mm position point W of the edge part₁₂Thickness H of₁₂493 μm, edge 12mm position point W, see Table 2₁₂The value range of the standard threshold X is more than or equal to-5 μm, in this embodiment, the standard threshold X is-5 μm, and H₁₀-H₁₅3 μm > X, position point W₁₂And position point W₁₅Is within the range of the standard threshold value X and belongs to a controlled level, and the process returns to the original same plate difference control program.

The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.