CN112934977A - Same-plate difference improvement method adopting edge multipoint control - Google Patents
Same-plate difference improvement method adopting edge multipoint control Download PDFInfo
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- CN112934977A CN112934977A CN201911170050.3A CN201911170050A CN112934977A CN 112934977 A CN112934977 A CN 112934977A CN 201911170050 A CN201911170050 A CN 201911170050A CN 112934977 A CN112934977 A CN 112934977A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/18—Automatic gauge control
- B21B37/20—Automatic gauge control in tandem mills
Abstract
The invention discloses a same-plate difference improvement method adopting edge multi-point control, which sets H15And HCAnd HX、HY、HZ，H15And HCIs a threshold coefficient alpha, HXAnd HCIs a threshold coefficient beta, HYAnd HCIs a threshold coefficient theta, HZAnd HCThe ratio of (a) to (b) is a threshold coefficient delta, and the thickness values of any point of four points are compared with a threshold interval determined by corresponding four coefficients; if the thickness value of any point of the four points is less than or equal to the upper limit of the threshold control, respectively subtracting the lower limit of the thickness threshold of the corresponding position from the four thickness values, multiplying by a proportionality coefficient, adding the four products to obtain an accumulated thickness difference value, if the thickness value is less than 0, increasing the input degree of the same plate difference control means, and if the thickness value is more than or equal to 0, continuing the system to perform a comparative analysis cycle; if the thickness value of any point of the four points is larger than the upper limit of the threshold value control, the input degree of the same-plate difference control means is reduced. The invention improves the quality level of the object and reduces the abnormity of the user in the using process.
Description
Technical Field
The invention relates to a metallurgical machinery/pickling rolling technology, in particular to a same plate difference improving method adopting edge multipoint control.
Background
Edge Drop (Edge Drop for short, also called Edge reduction) of electrical steel sheet is an important parameter for the dimension of electrical steel sheet. 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.
As shown in fig. 1, the conventional definition of edge drop is the difference between the thickness at a position 100mm from the edge and the thickness at a position 15mm from the edge, i.e.: edge Drop ═ H100-H15. However, with the continuous improvement of the product quality requirement of the current user, the traditional Edge Drop definition is difficult to meet the requirement, and the situation that the requirement of the user on the section shape cannot be met when the control level of the traditional Edge Drop completely meets the unit control requirement often occurs. Therefore, the edge drop concept of the cold rolling unit for producing electrical steel products with the highest requirement on edge drop is expanded to the same plate difference, namely the thickness H of the central point of the strip steelCMinus the thickness H at a distance of 15mm from the edge15The difference of (a) is: same plate difference (edge drop) is HC-H15The edge reduction value obtained by calculation can really reflect the thickness difference in the whole board width range, and is an excellent index for representing the precision control capability of the unit.
The advanced UCMW type or UCM type rolling mill in the world today adopts a feedback control system for controlling the edge drop, and the main control idea is to use a working roll or an intermediate roll (as shown in fig. 2) with a chamfer or a special arc to compensate the edge thinning area through feedback control so as to reduce the edge drop value. The corresponding system is implemented by adjusting the roll play level according to the comparison between the measured data of the mill outlet edge drop instrument and the set threshold value. As shown in fig. 3, that is, when it is detected that the current same-plate difference value is smaller than the system set threshold value, the corresponding system does not output the play value but continues to cyclically compare the same-plate difference value with the system set threshold value; when the difference value of the current same plate is larger than the set threshold value of the system, the feedback control system outputs a roll shifting command, and the execution mechanism performs roll shifting after receiving the corresponding shifting command. In the process of roll movement, the execution mechanism executes corresponding tasks, so that a new movement command cannot be continuously received. After the executing mechanism completes the corresponding movement (the difference value of the same outlet and the system setting threshold value are continuously compared by the operation program of the feedback control system in the period of time, and the corresponding command is output according to the comparison result, only because the executing mechanism executes the previous command, the subsequent command is temporarily shielded), and the command output by the system is restarted to be received.
All of the currently known iso-plate difference control programs, whether they use a feedback or feedforward mode, are based on the center point thickness and the edge fixing position thickness (the current common cold rolling process takes the 15mm position of the edge) and the relative difference value of the center point thickness as the basis for control.
As shown in FIG. 4, in the same plate difference control process of the cold rolled product, a corresponding threshold interval is set, taking a product with a target thickness of 500 μm at the center point as an example, the target thickness at the 15mm position under the original control method is generally 495 μm to H15mm to 500 μm (the target value interval is about 1% of the target value interval of the center point thickness of 500 μm), that is, when the control means is put in, if the thickness at the 15mm position at the side part is more than 500 μm, the control is over-performed (the side part thickness is more than the center point thickness to cause an abnormality in the cold rolling production process), and at this time, a feedback signal is sent, and the. If the thickness of the 15mm position of the side part is less than 495 mu m, the control target is not reached, and at this time, a feedback signal is sent, and the input degree of the control means is improved. And when the thickness of the 15mm position of the side part is 495 mu m and H15mm and 500 mu, the target interval is reached, and the program performs normal measurement and circulates but does not output a control signal.
With the continuous improvement of user requirements (in the original situation, a user generally shears 10-15 mm on one side before using a cold-rolled finished plate after leaving a factory, in recent years, due to the improvement of cost consciousness, the trimming amount of the user is reduced to about 5-7 mm level), the problem of same plate difference in a region 5 mm-15 mm away from an edge part exposed in the using process is increased remarkably, the normal use is seriously influenced, and the same plate difference at the position of an edge part more than 15mm is improved to become a new direction of process improvement.
Under the original cold rolling process condition, the difference value of the thickness of the position of the middle reference point (the 100mm position or the central point of the edge) minus the thickness of the position of the 15mm is selected as the judgment basis of the control process, and the judgment basis is that the difference value has strong corresponding relation with the edge shearing amount of a terminal user in the use process. However, the technology has been in the history of nearly 30 years since the investment, and obviously contradicts the existing use condition of the end user (the unilateral trimming amount is continuously reduced), and the control method needs to be optimized by combining the actual situation of the user.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for improving the same plate difference by edge multipoint control, through analyzing the edge drop control process, the original logic that the difference value of the thickness of a central point minus the thickness of a position of 15mm is used as the judgment basis of the control process is optimized into the form that the difference values of the thickness of the central point minus the thicknesses of a plurality of positions of the edge are used as the judgment basis of the control process after the weighted average value is taken, the automatic feedback control is carried out on the same plate difference at the position outside the 15mm of the edge, the quality level of a real object is improved, and the abnormity in the use process of a user is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a same-plate difference improving method adopting edge multipoint control comprises the following steps:
the control of the whole edge section is carried out by adopting a multipoint control method: set H15Thickness of the steel sheet at a position 15mm from the edge of the steel sheet, HCThickness of the steel sheet at the center point of the steel sheet, HX、HY、HZThe thicknesses of the steel plates at three positions which are less than 15mm away from the edge of the steel plate respectively,
H15and HCIs a threshold coefficient alpha, HXAnd HCIs a threshold coefficient beta, HYAnd HCIs a threshold coefficient theta, HZAnd HCIs a threshold coefficient delta which is the ratio of,
the actual thickness value H of any point is calculated15、HX、HY、HZComparing the threshold value interval with the threshold value interval after the four coefficients of alpha, beta, theta and delta are determined;
if H is15、HX、HY、HZIf the thickness value of any point is less than or equal to the upper control limit of the threshold value, then:
H15thickness value minus H15The lower limit of the position thickness threshold value is used for obtaining the thickness difference value corresponding to the position, and the difference value is multiplied by a proportionality coefficient a;
HXthickness value minus HXThe lower limit of the position thickness threshold value is used for obtaining the thickness difference value corresponding to the position, and the difference value is multiplied by the proportionality coefficient b;
HYthickness value minus HYThe lower limit of the position thickness threshold value is used for obtaining the thickness difference value corresponding to the position, and the difference value is multiplied by the proportionality coefficient c;
HZthickness value minus HZThe lower limit of the position thickness threshold value is used for obtaining the thickness difference value corresponding to the position, and the difference value is multiplied by the proportionality coefficient d;
adding the four products to obtain an accumulated thickness difference value, if the accumulated thickness difference value is less than 0, sending a signal by the system, improving the input degree of a same-plate difference control means, and if the accumulated thickness difference value is more than or equal to 0, outputting no signal and continuously performing a comparison analysis cycle by the system;
if H is15、HX、HY、HZAnd if the thickness value of any point is larger than the upper limit of the threshold value, the system sends a signal, and the input degree of the same-plate difference control means is reduced.
The value ranges of the threshold coefficients alpha, beta, theta and delta are more than or equal to 0.9 and less than or equal to alpha, beta, theta and delta and less than 1.
The percentage coefficient of the proportionality coefficients a, b, c and d is more than or equal to 0 percent and less than or equal to 100 percent, and the percentage coefficient of a + b + c + d is more than or equal to 100 percent.
The same plate difference control means comprises the control of the play amount and the roll bending amount of the working roll or the middle roll.
X, Y and Z are distances from the edge position of the steel plate, the value range is 0mm < X, Y and Z < 15mm, X > Y > Z, and X, Y and Z are integers.
According to the same-plate difference improving method adopting edge multipoint control, the edge multipoint control concept and method are introduced to the edge except for the conventional 15mm position through analyzing the edge drop control process, so that the overall section shape of the edge is controlled, the quality level of a real object is improved, and the abnormity in the using process of a user is reduced. In the input process, the whole requirements of the section shape of the edge part are comprehensively considered, so that the level of a real object is improved, and the satisfaction degree of a user is obviously improved.
Drawings
FIG. 1 is a diagram of a conventional definition of edge drop;
FIG. 2 is a schematic view of a prior art roll;
FIG. 3 is a schematic illustration of a prior art roll control area;
FIG. 4 is a flow chart of a prior art single point control co-board difference method;
fig. 5 is a flow chart of the multipoint control same-board difference method of the invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
A certain 5-stand cold continuous rolling mill for producing electrical steel, the target thickness of the central point of the steel plate is HC(thickness 500 μm) and a thickness H of the steel plate at a distance of 15mm from the edge15And a center point thickness HCThe difference value comparison is a judgment reference value of the same-plate difference program input, and a target is selectedThe standard threshold value is 496 mu m and is less than or equal to H15Less than or equal to 500 mu m (the threshold coefficient alpha is 0.992). At the same time, to ensure the comparison of H15And the same-plate difference control effect of the edge position is realized, and the control of the whole edge section is carried out by adopting a multipoint control method. Increase of H15More edge position H12、H10、H7Three thickness data (0mm < X, Y, Z < 15mm, X > Y > Z integer, wherein X takes 12, Y takes 10, Z takes 7). Thickness H at 12mm12And a center point thickness HCThe comparison of the difference values is one of the judgment reference values input by the same-plate difference program in the method, and the selected target threshold value is 494 mu m-H12Less than or equal to 500 mu m (the threshold coefficient beta is 0.988). Thickness H at 10mm10And a center point thickness HCThe difference value comparison is one of judgment reference values of the same-plate difference program investment in the method, and the selected target threshold value is 492 mu m-H10Less than or equal to 500 mu m (the threshold coefficient theta is 0.984). Thickness H at 7mm7And a center point thickness HCThe comparison of the difference values is one of the judgment reference values of the difference program input of the same plate in the method, and the selected target threshold value is 490 mu m and H7Less than or equal to 500 mu m (the threshold coefficient delta is 0.980).
In this embodiment 1, the proportional coefficients a, b, c, and d corresponding to the four points are all 25% (0% to 100% of a, b, c, and d, and 100% of a + b + c + d). At this time, the actual thickness values of the four points are measured to be 498 μm, 493 μm, 491 μm and 490 μm respectively, and the measured values of the four points all exceed the upper limit of the thickness threshold by 500 μm, so that the system does not send a back-fleeing signal and continues to execute the method steps. Calculating the comparison relationship between the four measured values and the lower limit value of the thickness threshold value, wherein the comparison relationship is H15For example, the measured value of 498 μm minus the lower thickness threshold control limit of 496 μm yields 2 μm; for H12For example, the measured value 493 μm minus the lower limit of thickness threshold control 494 μm yields-1 μm; for H10For example, the measured value 491 μm minus the lower limit of the thickness threshold control of 492 μm gives-1 μm; for H7For example, the measurement 490 μm minus the lower thickness threshold control limit 490 μm yields 0 μm.
Because the proportional coefficients a, b, c and d of all selected points all take 25%, the final thickness comprehensive coefficient HSynthesis ofIs 0(2 μm 0.25-1 μm 0.25+0 μm 0.25). And the calculation result of the comprehensive thickness coefficient is 0, which indicates that the overall shape of the edge section just meets the requirement of the lower limit of the threshold control, the system has no extra output, and the process is circulated and calculated continuously.
In the case of example 1, the arrangement is summarized in the following table:
example 2
A certain 5-stand cold continuous rolling mill for producing electrical steel, the target thickness of the central point of the steel plate is HC(thickness 500 μm) and a thickness H at 15mm15And a center point thickness HCThe difference comparison is a judgment reference value of the same-plate difference program input, and a target threshold value is selected to be 496 mu m and not more than H15Less than or equal to 500 mu m (the threshold coefficient alpha is 0.992). Meanwhile, in order to ensure the same-plate difference control effect of the edge position of more than 15mm, the control of the whole edge section is carried out by adopting a multipoint control method. Increase of H15More edge position H12，H10，H7Three thickness data (0mm < X, Y, Z < 15mm, X > Y > Z are integers, wherein X takes 12, Y takes 10, and Z takes 7). Thickness H at 12mm12And a center point thickness HCThe comparison of the difference values is one of the judgment reference values input by the same-plate difference program in the new method, and the target threshold value is selected to be 494 mu m-H12Less than or equal to 500 mu m (the threshold coefficient beta is 0.988); thickness H at 10mm10And a center point thickness HCThe difference value comparison is one of judgment reference values input by the same-plate difference program in the new method, and the target threshold value is selected to be H with the value of 492 mu m-H10Less than or equal to 500 mu m (the threshold coefficient theta is 0.984); thickness H at 7mm7And a center point thickness HCThe comparison of the difference values is one of the judgment reference values input by the same-plate difference program in the new method, and the selected target threshold value is 490 mu m and H7Less than or equal to 500 mu m (the threshold coefficient delta is 0.98).
In this embodiment 2, the proportional coefficients a, b, c, and d corresponding to the four points all take 25% (0% to 100% of a, b, c, and d, and 100% of a + b + c + d). At this time, the actual thickness values of the four points were measured to be 496 μm, 492 μm, 490 μm, respectively. The measured values of the four points do not exceed the upper limit of the thickness threshold by 500 μm, so the system does not send a back-fleeing signal and continues to execute the method steps. Calculating the comparison relationship between the four point measurement values and the lower limit value of the thickness threshold value, wherein the comparison relationship is H15For example, the measured value of 496 μm minus the lower thickness threshold control limit of 496 μm yields 0 μm; for H12For example, the measured value of 492 μm minus the lower limit of the thickness threshold control of 494 μm yields-2 μm; for H10For the measurement 490 μm minus the lower thickness threshold control limit of 492 μm yields-2 μm; for H7For example, the measurement 490 μm minus the lower thickness threshold control limit 490 μm yields 0 μm.
Because the proportional coefficients a, b, c and d of all selected points all take 25%, the final thickness comprehensive coefficient HSynthesis ofIs-1 μm (0 μm 0.25-2 μm 0.25+0 μm 0.25). The calculation result of the thickness comprehensive coefficient is-1 μm, which indicates that the whole shape of the edge section does not meet the requirement of the lower limit of the threshold control, the system sends signals, and the input degree of the same-plate difference control means (the movement amount and the roll bending amount) is improved.
In the case of example 1, the arrangement is summarized in the following table:
it should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (5)
1. A same-plate difference improving method adopting edge multipoint control comprises the following steps:
method for controlling by multiple pointsThe method comprises the following steps of (1) controlling the whole edge section: set H15Thickness of the steel sheet at a position 15mm from the edge of the steel sheet, HCThickness of the steel sheet at the center point of the steel sheet, HX、HY、HZThe thicknesses of the steel plates at three positions which are less than 15mm away from the edge of the steel plate respectively,
H15and HCIs a threshold coefficient alpha, HXAnd HCIs a threshold coefficient beta, HYAnd HCIs a threshold coefficient theta, HZAnd HCIs a threshold coefficient delta which is the ratio of,
the actual thickness value H of any point is calculated15、HX、HY、HZComparing the threshold value interval with the threshold value interval after the four coefficients of alpha, beta, theta and delta are determined;
if H is15、HX、HY、HZIf the thickness value of any point is less than or equal to the upper control limit of the threshold value, then:
H15thickness value minus H15The lower limit of the position thickness threshold value is used for obtaining the thickness difference value corresponding to the position, and the difference value is multiplied by a proportionality coefficient a;
HXthickness value minus HXThe lower limit of the position thickness threshold value is used for obtaining the thickness difference value corresponding to the position, and the difference value is multiplied by the proportionality coefficient b;
HYthickness value minus HYThe lower limit of the position thickness threshold value is used for obtaining the thickness difference value corresponding to the position, and the difference value is multiplied by the proportionality coefficient c;
HZthickness value minus HZThe lower limit of the position thickness threshold value is used for obtaining the thickness difference value corresponding to the position, and the difference value is multiplied by the proportionality coefficient d;
adding the four products to obtain an accumulated thickness difference value, if the accumulated thickness difference value is less than 0, sending a signal by the system, improving the input degree of a same-plate difference control means, and if the accumulated thickness difference value is more than or equal to 0, outputting no signal and continuously performing a comparison analysis cycle by the system;
if H is15、HX、HY、HZIf the thickness value of any point is greater than the upper control limit of the threshold value, the system sendsThe input degree of the signal and the same-plate difference control means is reduced.
2. The method of edge multi-point control for improving same plate difference as claimed in claim 1, wherein: the value ranges of the threshold coefficients alpha, beta, theta and delta are more than or equal to 0.9 and less than or equal to alpha, beta, theta and delta and less than 1.
3. The method of edge multi-point control for improving same plate difference as claimed in claim 1, wherein: the percentage coefficient of the proportionality coefficients a, b, c and d is more than or equal to 0 percent and less than or equal to 100 percent, and the percentage coefficient of a + b + c + d is more than or equal to 100 percent.
4. The method of edge multi-point control for improving same plate difference as claimed in claim 1, wherein: the same plate difference control means comprises the control of the play amount and the roll bending amount of the working roll or the middle roll.
5. The method of edge multi-point control for improving same plate difference as claimed in claim 1, wherein: x, Y and Z are distances from the edge position of the steel plate, the value range is 0mm < X, Y and Z < 15mm, X > Y > Z, and X, Y and Z are integers.
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Application publication date: 20210611 |