CN112570464B - Improved same-plate difference control method for edge section shape - Google Patents
Improved same-plate difference control method for edge section shape Download PDFInfo
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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Abstract
The invention discloses an improved identical plate difference control method for the cross 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 Is within the same plate difference control threshold interval,the addition supplement control method comprises the following steps of S1: selecting 15mm position point W of the edge part 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); and step S3: judging whether the difference value is greater than a standard threshold value X, if so, returning to the step 1, otherwise, executing the step S4; and step S4: judging whether the same-plate difference control means are all put into use, if so, returning to the step 1, and 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 away from the edge part, improve the quality level of a real object and reduce abnormal use.
Description
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 thinning) 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 edge 100 Thickness (H) of 100 ) Minus the position W of 15mm from the edge 15 Thickness (H) of 15 ) However, as the quality requirement of the product is continuously improved, the traditional edge drop definition is difficult to meet the requirement, and often the control level of the traditional edge drop completely reaches the unit controlWhen the requirement is met, the requirement of the user on the section shape still cannot be met. Therefore, the edge drop concept of the cold rolling mill set 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 c Thickness H C Minus the position W of 15mm from the edge 15 Thickness H of 15 Difference of (i.e. same plate difference (edge drop) = H) C －H 15 。
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 feedback or feedforward mode 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 center point thickness H c The relative difference value of the steel plate is controlled on the basis, and the quality requirement of a user on the steel plate after unilateral shearing of 10-15mm can be met. However, with the continuous increase of user requirements and the increase of cost consciousness, the trimming amount of the steel plate is reduced to about 5-7mm, the same plate difference problem in the area which is exposed in the using process and is 5 mm-15 mm away from the edge 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 invention 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 acquires strip steel edge drop data of two side parts in the sampling length, and the edge drop instrument is used for measuringCalculating a preset value of the play position of the play working roll of the continuous rolling mill in the sampling length and storing the value; 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 mill, the PLC controls the shifting working roll to shift on the strip steel in the sampling length according to the preset value of the shifting position in the sampling length. Although the method realizes the high-precision control of the edge drop of the strip steel, the method mainly adopts the control principle of the edge drop of the strip steel, and reduces the edge drop value, namely H, by using a roller shifting mode 15 To H 100 Does not relate to a method for optimizing the same plate difference of the position of the edge part which is more than 15mm 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 of 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 shape curve at the intersection point of the arc and the straight line is zero, namely the roller shape curve of the working roller at the side is a smooth curve, the arc roller line is used for controlling the edge drop of strip steel, and the arc enters the edge of the strip steel; the other side is in the shape of an arc roller or a linear taper angle roller and is used for reducing or eliminating a harmful contact area, and the arc roller or the linear roller does not enter the strip steel; the roll shape directions of the upper working roll and the lower working roll are opposite, namely, a roll line at the driving end side of the upper working roll is arranged at the operating end side of the lower working roll, and a roll line at the operating end side of the upper working roll is arranged 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 cross section shape of an edge part, which can automatically perform feedback control on 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 in the using process of a user.
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;
and 2, step: collecting position points W with the distance of 15mm from the edge part 15 Thickness H of the strip 15 And the center thickness H of the strip c Periodically calculating the position point W15 mm away from the edge part 15 Thickness H of 15 And center thickness H c A difference value of (a);
and 3, step 3: determine the position point W15 mm away from the edge 15 Thickness H of 15 And center thickness H c Whether the difference value of (1) is within the same-plate difference control threshold interval or not;
i) If it is 15mm from the side part 15 Thickness H of 15 And center thickness H c If the difference value of the difference values 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 edge 15 Thickness H of 15 And center thickness H c If the difference value is larger than the upper limit of the same-plate difference control threshold interval, executing the step 4;
iii) If the distance W is 15mm from the edge 15 Thickness H of 15 And center thickness H c If 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 edge 15 Thickness H of 15 And center thickness H c Adding a supplementary control method under the condition that the difference value of the control threshold value interval is within the same plate difference;
the supplementary control method comprises the following steps:
step S1: at each calculationIn the period, a 15mm position point W of the edge part is selected 15 Outer position point W Edge part Detecting the position point W Edge part Thickness H of strip at Edge part And position point W Edge part Point W at 15mm from the edge 15 Are positioned at the same side of the strip steel;
step S2: at the 15mm position W of the edge 15 Thickness H of 15 Calculating the same side position point W as the thickness reference value Edge part Thickness H of Edge part And a thickness reference value H 15 A difference of (d);
and 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 a step S4;
and step S4: judging whether the same-plate difference control means are all put into use, if so, returning to the step 1, otherwise, executing the step S5;
step S5: and (4) periodically improving the input degree of the same-plate difference compensation control means until the difference value is greater 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 steel 5 7mm position point W of edge portion 7 10mm position point W of edge 10 12mm position point W of edge 12 。
The value range of the standard threshold value X is as follows:
15mm position point W 15 The value range of the standard threshold value X is X =0 μm;
14mm position point W 14 The 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 W 13 The 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 W 12 The 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 W 11 The value range of the standard threshold value X is that X is more than or equal to 0 μm and more than or equal to-5 μm;
10mm position point W 10 Sign of (2)The value range of the quasi-threshold value X is more than or equal to 0 mu m and more than or equal to-5 mu m;
9mm position point W 9 The 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 W 8 The 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 W 7 The value range of the standard threshold value X is that X is more than or equal to 0 μm and more than or equal to-8 μm;
6mm position point W 6 The 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 W 5 The value range of the standard threshold value X is more than or equal to 0 μm and more than or equal to X and more than or equal to-10 μm.
The same-plate difference compensation control means comprises the steps of working roll movement and increasing 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 positioned 15 Thickness H 15 The control program still normally runs according to the steps 1 to 6, namely if the position point W is aligned Edge part Results in a 15mm position point W during supplementary control of the thickness 15 Thickness H of 15 Greater than the center thickness H c The 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 related 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 the 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 flowchart of a method for controlling a side section shape according to a conventional technique;
FIG. 2 is a flow chart of the improved edge profile co-sheet differential 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 side section shape according to the prior art 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 part 15 Thickness H of the strip 15 And the center thickness H of the strip c Periodically calculating the position point W15 mm away from the edge part 15 Thickness H of 15 And center thickness H c Wherein the calculation period is generally 0.5s to 5s, preferably 1s. At H 15 When the voltage is larger or smaller, the signal output of the same-plate difference control program is triggered.
And step 3: determine the position point W15 mm away from the edge 15 Thickness H of 15 And center thickness H c Whether the difference value of (a) is within the same-plate difference control threshold interval.
i) If the distance W is 15mm from the edge 15 Thickness H of 15 And center (c)Thickness H c If 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 edge 15 Thickness H of 15 And center thickness H c If the difference is larger than the upper limit of the same-plate difference control threshold interval, step 4 is executed.
iii) If the distance W is 15mm from the edge 15 Thickness H of 15 And center thickness H c If 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: reducing the input degree of the same plate difference control means, namely reducing the work roll movement or/and increasing the input degree of the control means of the work roll bending value, 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 c For example, a product having a target thickness of 500 μm, at a 15mm position point W under the existing control process 15 Target thickness of (2) is generally 495 μm & lt, H 15 Less 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 W 15 Thickness H of 15 If the thickness is more than 500 mu m, the control is over (the thickness of the edge part is more than that of the central point, which causes the abnormity of the cold rolling production process), and at the moment, a feedback signal is sent, and the input degree of a control means is reduced. If 15mm position point W 15 Thickness H of 15 If the current value is less than 495 mu m, the result shows that 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 is 15 Thickness H of 15 H is 495 mu m ≤ 15 When 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 process 15 Thickness H of 15 Achieve the purpose of controlThe target can meet the user's requirement, but at a more marginal point, e.g. W 12 、W 10 The equal position points are not controlled in a targeted manner. Thickness of position point and position point W of normal thickness curled portion 15 Thickness H of 15 The 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 W 15 Thickness H of 15 The 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 | W 10 | W 12 | W 15 | W 100 | W C | W 100 | W 15 | W 12 | W 10 |
| 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 part 15 Thickness H of 15 With strip steel central point W c Center thickness H of c Is controlled based on the difference value of (A) at a position point W in the abnormal thickness roll 15 Thickness H of 15 When 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 solved 10 、W 12 ) 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 portion 15 Thickness H of 15 And center thickness H c Is within the same-plate difference control threshold interval, namely when the condition i of the step 3 is met, 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 selected 15 Outer 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 edge 15 Is 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 compared with the edge part 15 Closer to the edge, but too small a distance from the edge (e.g. < 5 mm) will result 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 steel 5 Edge 7mm position point W 7 10mm position point W of edge 10 12mm position point W of edge 12 . 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 edge 15 Thickness H of 15 Calculating the same side position point W as the thickness reference value Edge part Thickness H of Edge part And a thickness reference value H 15 The difference of (c).
And step S3: and 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. At a 12mm position point W 12 Thickness H 12 For example, when H 12 Minus H 15 When 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 shown 12 Thickness H of strip steel 12 The 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 W Edge part Distance 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 |
And step S4: and (4) judging whether the same-plate difference control means is completely put into use, if so, performing the supplementary control, returning to the step 1, and if not, executing the step 5.
Step S5: and (4) periodically improving the input degree of the same-plate difference compensation control means until the difference value is greater 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 work roll play and increase of a work roll bending value, 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 positioned 15 Target thickness H 15 All 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 control 15 Thickness H of 15 Greater than the center thickness H c The 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 c Selecting 15mm position points W on the two side edges of the strip steel at the position of 500 mu m 15 Thickness H of 15 Is a thickness reference value, namely 495 mu m & lt, H 15 Less than or equal to 500 mu m, namely-5 mu m less than or equal to H 15 -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 steel 15 Thickness H of 15 Are all 497 μm, and the 15mm position point W of the edge part is calculated 15 Thickness H of 15 The thickness H of the center of the strip steel c Difference of (H) 15 -H C H is not less than 5 μm and not more than 3 μm 15 -H C Less 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 part 10 Thickness H of 10 493 μm, edge 10mm position point W, see Table 2 10 The standard threshold value at (B) should satisfy X ≧ 5 μm, in this embodiment, the standard threshold value X is taken as-3 μm. H 10 -H 15 = 4 μm < X, i.e. position point W 10 And position point W 15 Is out of the range of the standard threshold value X, indicating the 10mm position point W of the edge part 10 Thickness H of 10 The 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 comprises two kinds: 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. And each calculation period is 3s, and if the control target is not reached in each period, a work roll play 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 side of the working roll shifting value is 89mm (the maximum value is 105 mm), the transmission side is 93mm (the maximum value is 105 mm), and the input value of the working roll bending 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.
Triggering the working roll to move (1 mm/time) according to the system logic, wherein the calculation period is 3 seconds, and the system carries out integral section data according to the period of 3 secondsAnd triggering corresponding conditions according to actual conditions. Through the operation of 3 cycles, the working roll movement value reaches the level of 92mm, and H is at the moment C 500 μm, 15mm lateral point W 15 Thickness H of 15 498 mu m, edge 10mm position point W 10 Thickness H of 10 496 μm, at which time H 10 -H 15 And the logic returns to the same plate difference control initial program to continue running, wherein the value is = 2 μm and belongs to a controlled level.
Example 2:
in this embodiment, the center thickness H of the strip steel c Selecting a 15mm position point W of the edge part at 500 μm 15 Thickness H of 15 Is a thickness reference value, namely 495 mu m & lt, H 15 Less than or equal to 500 mu m, namely less than or equal to 5 mu m and less than or equal to H 15 -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 steel 15 Thickness H of 15 Are 496 μm in all, and calculate the 15mm position point W of the edge 15 Thickness H of 15 The thickness H of the center of the strip steel c Difference of (H) 15 -H C H is not less than 5 μm and not more than 4 μm 15 -H C Less 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 part 12 Thickness H of 12 493 μm, edge 12mm position point W, see Table 2 12 The 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 H 10 -H 15 = 3 μm > X, i.e. position point W 12 And position point W 15 The thickness difference value of (2) is within the range of a standard threshold value X, belongs to a controlled level, and returns to the original same plate difference control program continuously.
The present invention is not limited to the above embodiments, and therefore, any modifications, equivalents, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
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;
and 2, step: collecting position points W with the distance of 15mm from the edge part 15 Thickness H of the strip 15 And the center thickness H of the strip c Periodically calculating the position point W15 mm away from the edge part 15 Thickness H of 15 And center thickness H c A difference of (d);
and step 3: determine the position point W15 mm away from the edge 15 Thickness H of 15 And center thickness H c Whether 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 edge 15 Thickness H of 15 And center thickness H c If the difference value of the difference values 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 edge 15 Thickness H of 15 And center thickness H c If the difference value is larger than the upper limit of the same-plate difference control threshold interval, executing the step 4;
iii) If the distance W is 15mm from the edge 15 Thickness H of 15 And center thickness H c If 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 edge 15 Thickness H of 15 And center thickness H c Adding a supplementary control method under the condition that the difference value of the time difference is within the same plate difference control threshold value interval;
the supplementary control method comprises the following steps:
step S1: in each calculation cycle, a 15mm position point W of the edge is selected 15 Outer position point W Edge part Detecting the position point W Edge part Thickness H of strip steel Edge part And is made ofPosition point W Edge part 15mm from the edge 15 Are positioned at the same side of the strip steel;
step S2: at the 15mm position W of the edge 15 Thickness H of 15 Calculating the same side position point W as the thickness reference value Edge part Thickness H of Edge part And a thickness reference value H 15 A difference of (d);
and 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 a step S4;
and step S4: 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 S5;
step S5: and (4) periodically improving the input degree of the same-plate difference compensation control means until the difference value is greater 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 steel 5 7mm position point W of edge portion 7 10mm position point W of edge 10 12mm position point W of edge 12 。
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 W 15 The standard threshold value X is in the range of X =0 μm;
14mm position point W 14 The 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 W 13 The 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 W 12 The 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 W 11 The 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 W 10 The 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 W 9 The 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 W 8 The value range of the standard threshold value X is that X is more than or equal to 0 μm and more than or equal to-7 μm;
7mm position point W 7 The 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 W 6 The 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 W 5 The value range of the standard threshold value X is more than or equal to 0 μm and more than or equal to X and more than or equal to-10 μm.
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 edge section shape coincidence plate difference control method according to claim 1 or 5, wherein: the input logic of the same-plate difference compensation control means is as follows: firstly executing the work roll movement, and then increasing the roll bending value of the work roll.
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 positioned 15 Thickness H 15 The control program still normally runs 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 thickness 15 Thickness H of 15 Greater than the center thickness H c The system reduces the input level of the same-plate difference control means for the transmission signal.
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