CN113732073B - Correction method for flatness defect of finish rolling outlet strip steel - Google Patents
Correction method for flatness defect of finish rolling outlet strip steel Download PDFInfo
- Publication number
- CN113732073B CN113732073B CN202010474909.6A CN202010474909A CN113732073B CN 113732073 B CN113732073 B CN 113732073B CN 202010474909 A CN202010474909 A CN 202010474909A CN 113732073 B CN113732073 B CN 113732073B
- Authority
- CN
- China
- Prior art keywords
- strip steel
- flatness
- defect
- error
- width
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
-
- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
A method for correcting flatness defects of finish rolling outlet strip steel is used for correcting and accurately correcting flatness defect data and comprises the following steps: data detection and curve fitting; typical positions are determined along the width direction of the strip steel, and the straightness of each typical position is determined according to a fitting function; determining a judgment coefficient of edge error judgment according to the straightness of each typical position; determining and generating an error type according to the straightness of each typical position, the discrimination coefficient and the deviation of the finish rolling outlet width gauge; judging the error condition at each moment according to the error type, establishing respective correction treatment according to the judgment result, and finishing outputting flatness defect data after strip steel correction based on different correction treatments; according to the correction method for the flatness defect of the strip steel at the finish rolling outlet, more accurate strip steel flatness defect data after strip steel deviation influence and edge laser device fault influence in the flatness defect are planed out are formed, so that follow-up quality detection judgment and model feedback control are provided.
Description
Technical Field
The invention belongs to the technical field of hot rolling of strip steel, and particularly relates to a method for correcting flatness defects of the strip steel at a finish rolling outlet.
Background
Strip flatness refers to the relative extension difference between the fiber length of the steel sheet at the middle and the edge (see fig. 1, fig. 1 shows a group of 4 defects in total).
The straightness is an important index of hot rolling product, and the straightness defect directly influences downstream user's processing and uses, carries out feedback control through the actual measurement straightness of finish rolling export belted steel and reduces the emergence of straightness defect, and the quality of control effect directly depends on the accuracy of straightness detection data. Therefore, the online accurate measurement of the flatness of the hot rolled strip is increasingly paid more attention by manufacturers of the hot rolled strip.
The surface flatness of the hot-rolled strip steel is mainly detected by adopting a laser plate shape detector, the working principle of the laser plate shape detector is a laser triangulation method, a laser is emitted by a laser to irradiate the surface of the strip steel, a camera is used for shooting a diffuse reflection light spot image of the surface of the irradiated strip steel, the diffuse reflection light spot image is converted into the strip steel change height according to the displacement represented by the position change of the light spot image, then the strip steel change height is converted into the length according to the measurement time and the measurement speed, and the strip steel change height is converted into the fiber length delta L (shown in figure 2) of the steel plate measurement position according to the height delta h and the length s delta t.
As the flatness of the strip steel refers to the relative extension difference of the fiber length in the width direction of the steel plate, 7-9 laser emitting devices (the structural schematic diagram is shown in figure 3) are generally arranged along the width direction of the strip steel in the flatness detection, wherein, laser at a fixed position is irradiated at the central position of the width of the strip steel, and the laser at a rotatable position is irradiated at the edge position of the width of the strip steel according to the rotating position of the width of the strip steel, thereby obtaining the fiber length at different positions in the width direction of the strip steel, and converting the fiber length into the flatness defect detection value according to the width position and the fiber length for the automatic control of a feedback model.
However, because the hot-rolled strip steel belongs to a thin plate, the strip steel is easy to deviate in the production process, the width position in the detection process is not corresponding to the theoretical width position, and the flatness of the position at the most edge part in the width direction cannot be measured when the deviation amount is large, so that the flatness detection accuracy of the strip steel is influenced, and the flatness defect control is further influenced.
The invention application with the application number of 2008100398564 discloses a cold-rolled strip steel flatness control method, which comprises flatness feedforward control, flatness feedback control and coordination control between the flatness feedforward control and the flatness feedback control, wherein the section shape of a hot-rolled incoming material is detected in real time based on a profiler arranged at an inlet of a first rack, the flatness and the actually measured rolling technological parameters of each rack comprise a rolling force actually-measured value and a plate shape adjusting mechanism actually-measured value, the flatness of outlets of all the racks is subjected to feedforward control, and the flatness of the outlets of the last rack is subjected to feedback control based on the actually-measured flatness of the cold-rolled strip steel of a plate shape roller arranged at an outlet of a cold-rolling mill.
Disclosure of Invention
The invention provides a correction method of finish rolling outlet strip steel flatness defect, which aims to remove strip steel deviation influence factors in defects and influence factors of false detection caused by edge laser device faults and obtain more accurate strip steel flatness defect data so as to provide accurate data for subsequent quality detection judgment and model feedback control, and the technical scheme is as follows:
a method for correcting flatness defects of finish rolling outlet strip steel is based on a laser plate shape detector for detecting the fiber length of a steel plate measuring position and used for correcting and accurately correcting flatness defect data, and is characterized by comprising the following steps of:
s1: generating position data of each width position along the width direction of the strip steel according to the detection data of the laser plate shape detector;
s2: taking the position data as independent variables and the straightness data of each position as dependent variables, and performing curve fitting for four times;
s3: determining typical positions along the width direction of the strip steel, and determining the straightness of each typical position according to a fitting function;
s4: determining a judgment coefficient of edge error judgment according to the straightness of each typical position;
s5: determining and generating an error type according to the straightness of each typical position, the discrimination coefficient and the deviation of the finish rolling outlet width gauge;
s6: judging the error condition of each moment according to the error type, and outputting final judgment without errors if the judgment result does not belong to the error type; if the judgment result belongs to the error type, the step S7 is carried out;
s7: and establishing respective correction processing according to the specific error types, and finishing the output of the flatness defect data after the strip steel is corrected based on different correction processing.
The invention discloses a method for correcting flatness defects of finish rolling outlet strip steel, which is characterized by comprising the following steps of:
a flatness defect correction subunit is developed in an arithmetic unit for controlling the flatness of the strip steel,
the above steps S1 to S7 are completed in the flatness defect correction subunit;
in step S6, when no error is finally determined, the straightness defect subunit informs the operation unit for controlling the straightness of the strip steel to operate according to the original straightness data;
in step S7, the flatness defect data after the strip steel correction is output to the strip steel flatness control arithmetic unit as the current flatness data participating in the arithmetic operation of the strip steel flatness control arithmetic unit.
The method for correcting the flatness defect of the finish rolling outlet strip steel is characterized by comprising the following steps of:
the curve fitting in step S2 is done based on a least squares fit,
the fitting function is:
F＝a 4 W 4 +a 3 W 3 +a 2 W 2 +a 1 W+a 0
wherein the content of the first and second substances,
f: straightness in IU;
w: corresponding width position in mm.
The method for correcting the flatness defect of the finish rolling outlet strip steel is characterized by comprising the following steps of:
determining a typical position along the width direction of the strip steel in the step S3, which specifically comprises the following steps:
5 typical positions are sequentially determined from the transmission side to the working side along the width direction, wherein the positions are respectively W1, W2, W3, W4 and W5,
wherein the content of the first and second substances,
w1: at a position of 40mm in the width direction,
w2: at the position of 1/4 of the width,
w3: at the center of the width, the width of the film,
w4: at the position of 3/4 of the width,
w5: the strip steel width minus 40 mm.
The method for correcting the flatness defect of the finish rolling outlet strip steel is characterized by comprising the following steps of:
the determining of the determination coefficient of the edge error determination according to the straightness of each typical position in step S4 specifically includes:
A ds ＝F w1 /F w2
A ws ＝F w5 /F w4
wherein, the first and the second end of the pipe are connected with each other,
F w1 : flatness at W1;
F w2 : flatness at W2;
F w4 : flatness at W4;
F w5 : flatness at W5;
A ds : the edge part discrimination coefficient of the transmission side;
A ws : the edge part discrimination coefficient of the working side.
The method for correcting the flatness defect of the finish rolling outlet strip steel is characterized by comprising the following steps of:
the error types in step S5 include a first type, a second type, a third type and a fourth type,
the first type is as follows: f w1 ≤5&A ds ≤G T &C i ≥5；
The second type is as follows: f w1 ≤5&A ds ≤G T &C i ＜5；
The third type is as follows: f w5 ≤5&A ws ≤G T &C i ≤-5；
The fourth type is as follows: f w5 ≤5&A ws ≤G T &C i ＞-5；
Wherein, the first and the second end of the pipe are connected with each other,
G T : the abnormal threshold value is related to the thickness of the strip steel and ranges from 0.05 to 0.1;
C i : and (4) measuring the deviation amount of the finish rolling outlet width gauge at the ith moment in mm.
The method for correcting the flatness defect of the finish rolling outlet strip steel is characterized by comprising the following steps of:
the correction processing performed based on the first type of error specifically includes:
will be original W ij Corrected to XW ij And according to the corrected XW ij Value of F w1 、F w2 、F w3 、F w4 、F w5 Is calculated, error is realizedCorrecting data; using the corrected data to complete the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
the original W ij Corrected to XW ij According to the following: XW ij ＝W ij -C i Completing the process;
the bonding i ＝(F w1 +F w5 )/2-F w3
Said level i ＝F w1 -F w5 ；
Wherein, i: the ith moment; j: from the drive side to the position of the laser transmitter irradiation at the work side.
The invention discloses a method for correcting flatness defects of finish rolling outlet strip steel, which is characterized by comprising the following steps of:
the correction processing performed based on the second type of error specifically includes:
at this time F w1 To be ineffective, use F w2 、F w4 Substitute F w1 Completing the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
the bonding i ＝2×(F w2 +2×F w5 )/3-2×F w4 ；
Said level i ＝(4×F w5 -F w2 )/3-F w4 。
The invention discloses a method for correcting flatness defects of finish rolling outlet strip steel, which is characterized by comprising the following steps of:
the correction processing performed based on the error of the third type specifically includes:
will be original W ij Corrected to XW ij And according to the corrected XW ij Value of F w1 、F w2 、F w3 、F w4 、F w5 The error data correction is realized by the calculation of (1); using the corrected data to complete the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
the original W ij Corrected to XW ij According to the following: XW ij ＝W ij +C i Completing the process;
the bonding i ＝(F w1 +F w5 )/2-F w3
Said Leveling i ＝F w1 -F w5 ；
Wherein, i: the ith moment; j: from the drive side to the position of the laser transmitter irradiation at the work side.
The method for correcting the flatness defect of the finish rolling outlet strip steel is characterized by comprising the following steps of:
the correction processing performed based on the fourth type of error specifically includes:
at this time F w5 To be ineffective, use F w2 、F w4 Substitute F w5 Completing the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
the bonding i ＝2×(F w4 +2×F w1 )/3-2×F w2 ；
Said Leveling i ＝(F w4 -4×F w1 )/3+F w2
The invention relates to a method for correcting flatness defects of finish rolling outlet strip steel,
firstly, according to the detection data of an original laser plate shape detector for detecting the fiber length of a steel plate measuring position, forming the calibration of the specific position of the current strip steel along the width direction, taking the specific position as an independent variable and the flatness of the corresponding position as a dependent variable, and adopting a least square method to carry out four-time fitting to form the tracking of the corresponding flatness based on the specific position;
secondly, setting a discrimination coefficient for determining edge error discrimination, wherein the discrimination coefficient comprises a transmission side discrimination coefficient and an operation side discrimination coefficient, sequentially determining typical positions from the transmission side to the working side along the width direction of the strip steel, and completing calculation of corresponding discrimination coefficients according to the flatness of the typical positions;
thirdly, setting an error type determined and generated based on the straightness of each typical position, the discrimination coefficient and the deviation of the finish rolling outlet width gauge; and corresponding error judgment is carried out on the current moment according to the error type, and the output of judging no error or judging error is carried out;
finally, aiming at the situation that the judgment is wrong, respectively establishing respective correction treatment according to specific error types, and finishing outputting flatness defect data after the strip steel is corrected according to the correction treatment;
in summary, the correction method for the flatness defect of the strip steel at the finish rolling outlet of the invention removes the strip steel deviation influence factor in the flatness defect and the influence factor of error detection caused by the fault of the edge laser device, obtains more accurate strip steel flatness defect data, and provides accurate data for subsequent quality detection judgment and model feedback control.
Drawings
FIG. 1 is a schematic view of flatness defects of a background section of the present invention;
FIG. 2 is a schematic view showing the principle of flatness measurement in the lengthwise direction of a strip steel according to the background art of the present invention;
FIG. 3 is a schematic structural view of a device for measuring flatness in the width direction of a strip according to the background art of the present invention;
FIG. 4 is a diagram of a correction procedure according to the present invention;
FIG. 5 is a schematic view showing a typical position in the width direction of a strip steel according to the present invention;
fig. 6 is a diagram illustrating comparison between the detection value of the embodiment of the present invention and the detection value of the prior art.
Detailed Description
The method for correcting the flatness defect of a finish rolling outlet strip according to the present invention will be described in detail with reference to the drawings and embodiments.
A method for correcting flatness defects of a finish rolling outlet strip steel is based on a laser plate shape detector for detecting the fiber length of a steel plate measuring position, and is used for correcting and accurately correcting flatness defect data, as shown in figure 4, and comprises the following steps:
s1: generating position data of each width position along the width direction of the strip steel according to the detection data of the laser plate shape detector;
s2: taking the position data as independent variables and the straightness data of each position as dependent variables, and performing curve fitting for four times;
s3: determining typical positions along the width direction of the strip steel, and determining the straightness of each typical position according to a fitting function;
s4: determining a judgment coefficient of edge error judgment according to the straightness of each typical position;
s5: determining and generating an error type according to the straightness of each typical position, the discrimination coefficient and the deviation of the finish rolling outlet width gauge;
s6: judging the error condition of each moment according to the error type, and outputting final judgment without errors if the judgment result does not belong to the error type; if the judgment result belongs to the error type, the step S7 is carried out;
s7: and establishing respective correction treatment according to the specific error types, and finishing the output of the flatness defect data after the strip steel is corrected based on different correction treatments.
Wherein the content of the first and second substances,
a flatness defect correction subunit is developed in a calculation unit for controlling the flatness of the strip steel,
the above steps S1 to S7 are completed in the flatness defect correction subunit;
in step S6, when no error is finally determined, the straightness defect subunit informs the operation unit for controlling the straightness of the strip steel to operate according to the original straightness data;
in step S7, the flatness defect data after the strip steel correction is output to the strip steel flatness control arithmetic unit as the current flatness data participating in the arithmetic of the strip steel flatness control arithmetic unit, and this part is used for combining with the existing flatness control.
Wherein the content of the first and second substances,
the curve fitting in step S2 is done based on a least squares fit,
the fitting function is:
F＝a 4 W 4 +a 3 W 3 +a 2 W 2 +a 1 W+a 0
wherein the content of the first and second substances,
f: straightness in IU;
w: corresponding width position in mm.
Wherein the content of the first and second substances,
determining a typical position along the width direction of the strip steel in the step S3, which specifically comprises the following steps:
5 typical positions are sequentially determined from the transmission side to the working side along the width direction, wherein the positions are respectively W1, W2, W3, W4 and W5,
wherein the content of the first and second substances,
w1: at a position of 40mm in the width direction,
w2: at the position of 1/4 of the width,
w3: at the center of the width, the width of the film,
w4: at the position of 3/4 of the width,
w5: the strip steel width minus 40 mm.
Wherein the content of the first and second substances,
the determining of the determination coefficient of the edge error determination according to the straightness of each typical position in step S4 specifically includes:
A ds ＝F w1 /F w2
A ws ＝F w5 /F w4
wherein the content of the first and second substances,
F w1 : flatness at W1;
F w2 : flatness at W2;
F w4 : flatness at W4;
F w5 : flatness at W5;
A ds : the edge part discrimination coefficient of the transmission side;
A ws : and the edge part discrimination coefficient of the working side.
Wherein the content of the first and second substances,
the error types in step S5 include four types, i.e. a first type, a second type, a third type and a fourth type,
the first type is as follows: f w1 ≤5&A ds ≤G T &C i ≥5；
The second type is as follows: f w1 ≤5&A ds ≤G T &C i ＜5；
The third type is as follows: f w5 ≤5&A ws ≤G T &C i ≤-5；
The fourth type is as follows: f w5 ≤5&A ws ≤G T &C i ＞-5；
Wherein the content of the first and second substances,
G T : the abnormal threshold value is related to the thickness of the strip steel and ranges from 0.05 to 0.1;
C i : and (4) measuring the deviation amount of the finish rolling outlet width gauge at the ith moment in mm.
Wherein, the first and the second end of the pipe are connected with each other,
the correction processing performed based on the first type of error specifically includes:
will be original W ij Corrected to XW ij And according to the corrected XW ij Value of proceeding with F w1 、F w2 、F w3 、F w4 、F w5 The error data correction is realized by the calculation of (2); using the corrected data to complete the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
the original W ij Corrected to XW ij According to the following: XW ij ＝W ij -C i Completing the process;
the bonding i ＝(F w1 +F w5 )/2-F w3
Said Leveling i ＝F w1 -F w5 ；
Wherein, i: the ith moment; j: from the drive side to the position of the laser transmitter irradiation at the work side.
Wherein the content of the first and second substances,
the correction processing performed based on the second type of error specifically includes:
at this time F w1 To be ineffective, use F w2 、F w4 Substitute F w1 Completing the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
saidBending i ＝2×(F w2 +2×F w5 )/3-2×F w4 ；
Said level i ＝(4×F w5 -F w2 )/3-F w4 。
Wherein the content of the first and second substances,
the correction processing performed based on the error of the third type specifically includes:
will be original W ij Corrected to XW ij And according to the corrected XW ij Value of proceeding with F w1 、F w2 、F w3 、F w4 、F w5 The error data correction is realized by the calculation of (1); using the corrected data to complete the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
the said will be original W ij Corrected to XW ij According to the following: XW ij ＝W ij +C i Completing the operation;
the bonding i ＝(F w1 +F w5 )/2-F w3
Said level i ＝F w1 -F w5 ；
Wherein, i: the ith moment; j: the laser transmitter irradiates from the transmission side to the working side.
Wherein the content of the first and second substances,
the correction processing performed based on the fourth type of error specifically includes:
at this time F w5 To be ineffective, use F w2 、F w4 Substitute F w5 Completing the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
the bonding i ＝2×(F w4 +2×F w1 )/3-2×F w2 ；
Said Leveling i ＝(F w4 -4×F w1 )/3+F w2 。
Examples
The method is further illustrated by the flatness detection example at the outlet of the finish rolling in a hot continuous rolling production line.
The specification of the strip steel of the embodiment is 2.73mm in thickness and 1062mm in width.
1) Flatness data F at each position in the width direction at the time of detecting the dot 1 is obtained ij (unit IU) and corresponding width position W ij (in mm), the data are shown in the following table.
| |
40 | 140 | 431 | 531 | 631 | 922 | 1022 |
| F ij | 44.10 | 44.13 | 17.55 | 9.42 | 4.41 | 2.89 | 0.17 |
2) Using least squares with W ij Is an independent variable, F ij In response to the amount of strainFour curve fits were performed, with the following results:
F＝-4.474 E-9 W 4 +1.041 E-5 W 3 -7.408 E-3 W 2 +1.075W+4.042 E2
3) Calculating flatness data F of 5 typical positions in the width direction according to the fitting result of the step 2 w1 、F w2 、F w3 、F w4 、F w5 The results are shown in the following table.
| F w1 | F w2 | F w3 | F w4 | F w5 |
| 44.10 | 32.48 | 9.42 | 2.46 | 0.17 |
4) According to formula A ds ＝F w1 /F w2 And A ws ＝F w5 /F w4 Calculating a discrimination coefficient, A ds The result was 1.36, A ws The result was 0.069.
5) And comprehensively judging the value of the Error type Error through the flatness data of the typical position, the judgment coefficient and the deviation of the finish rolling outlet width measuring instrument. This embodiment finish rolling export width gageOff tracking C i An abnormal threshold G of 5mm and a thickness of 2.73mm T 0.075, by error type discriminant: 1. f w1 ≤5&A ds ≤G T &C i ≥5；2、F w1 ≤5&A ds ≤G T &C i ＜5；3、F w5 ≤5&A ws ≤G T &C i ≤-5；4、F w5 ≤5&A ws ≤G T &C i > -5 identifies the Error type Error as 4, which is the 4 th Error type listed above.
6) According to the step 6 of the invention, when the value of the Error type Error is 4, the Error type Error is bound according to a formula i ＝2×(F w4 +2×F w1 )/3-2×F w2 And Leveling i ＝(F w4 -4×F w1 )/3+F w2 And calculating the real data of the strip steel flatness defect, wherein the real detection value of the symmetrical wave defect bundling at the moment is-4.5 IU of the middle wave defect, and the real detection value of the asymmetrical wave defect Leveling is-25.5 IU.
According to the same steps, the detected data of the 1 st point to the 40 th point of the strip steel head are processed, and the comparison result of the real detected value output by the invention and the prior art is shown in figure 6. From the comparison result of the two, the prior art considers that the defect of the symmetrical wave middle wave exists, and the detection of the invention considers the defect of the symmetrical wave edge wave.
In order to detect the effectiveness of the invention, the manual actual measurement is carried out on the detection position corresponding to the uncoiling of the strip steel. The result is the symmetrical wave edge defect, which shows that the defect type detected by the invention is correct, and the detection result of the original technology is wrong. Compared with the actually measured defect size, the actually measured wave height of 15mm corresponds to the flatness defect of 55.5IU, and the output detection value of the position corresponding to the invention is 56.1IU, which shows that the detection value of the invention is real.
The invention relates to a method for correcting flatness defects of finish rolling outlet strip steel,
firstly, according to the detection data of an original laser plate shape detector for detecting the fiber length of a steel plate measuring position, forming the calibration of the specific position of the current strip steel along the width direction, taking the specific position as an independent variable and the flatness of the corresponding position as a dependent variable, and adopting a least square method to carry out four-time fitting to form the tracking of the corresponding flatness based on the specific position;
secondly, setting a discrimination coefficient for determining edge error discrimination, wherein the discrimination coefficient comprises a transmission side discrimination coefficient and an operation side discrimination coefficient, sequentially determining typical positions from the transmission side to the working side along the width direction of the strip steel, and completing the calculation of the corresponding discrimination coefficient according to the flatness of the typical positions;
thirdly, setting an error type determined and generated based on the straightness of each typical position, the discrimination coefficient and the deviation of the finish rolling outlet width gauge; corresponding error judgment is carried out on the current moment according to the error type, and output of judging whether the current moment is error-free or error-free is made;
finally, aiming at the situation that the judgment is wrong, respective correction processing is respectively established according to specific error types, and the flatness defect data after the strip steel is corrected is output according to the correction processing;
in summary, the correction method for the flatness defect of the strip steel at the finish rolling outlet of the invention is used for planning off strip steel deviation influence factors in the flatness defect and misdetection influence factors caused by edge laser device faults, and obtaining more accurate strip steel flatness defect data so as to provide accurate data for subsequent quality detection judgment and model feedback control.
Claims (11)
1. A method for correcting flatness defects of finish rolling outlet strip steel is based on a laser plate shape detector for detecting the fiber length of a steel plate measuring position and used for correcting and accurately correcting flatness defect data, and is characterized by comprising the following steps of:
s1: generating position data of each width position along the width direction of the strip steel according to the detection data of the laser plate shape detector;
s2: taking the position data as independent variables and the straightness data of each position as dependent variables, and performing curve fitting for four times;
s3: determining typical positions along the width direction of the strip steel, and determining the straightness of each typical position according to a fitting function;
s4: determining a judgment coefficient of edge error judgment according to the straightness of each typical position;
s5: determining and generating an error type according to the straightness of each typical position, the discrimination coefficient and the deviation of the finish rolling outlet width gauge;
s6: judging the error condition of each moment according to the error type, and outputting final judgment without errors if the judgment result does not belong to the error type; if the judgment result belongs to the error type, the step S7 is carried out;
s7: and establishing respective correction treatment according to the specific error types, and finishing the output of the flatness defect data after the strip steel is corrected based on different correction treatments.
2. The method for correcting the flatness defect of the finish rolling outlet strip steel according to claim 1, characterized by comprising the following steps:
a flatness defect correction subunit is developed in an arithmetic unit for controlling the flatness of the strip steel,
the steps S1 to S7 are completed in the flatness defect correction subunit;
in step S6, when no error is finally judged, the straightness defect subunit informs the operation unit for controlling the straightness of the strip steel to operate according to the original straightness data;
in step S7, the flatness defect data after the strip steel correction is output to the strip steel flatness control arithmetic unit as the current flatness data participating in the arithmetic operation of the strip steel flatness control arithmetic unit.
3. The method for correcting the flatness defect of the finish rolling outlet strip steel according to claim 1, characterized in that:
the curve fitting in step S2 is done based on least squares fitting,
the fitting function is:
F＝a 4 W 4 +a 3 W 3 +a 2 W 2 +a 1 W+a 0
wherein the content of the first and second substances,
f: straightness in IU;
w: the corresponding width position, in mm;
a 0 、a 1 、a 2 、a 3 、a 4 are all constants.
4. The method for correcting the flatness defect of the finish rolling outlet strip steel according to claim 1, characterized in that:
the step S3 of determining the typical position along the width direction of the strip steel specifically includes:
5 typical positions are sequentially determined from the transmission side to the working side along the width direction, wherein the positions are respectively W1, W2, W3, W4 and W5,
wherein, the first and the second end of the pipe are connected with each other,
w1: at a position of 40mm in the width direction,
w2: at the position of 1/4 of the width,
w3: at the center of the width, the width of the film,
w4: at the position of 3/4 of the width,
w5: the strip steel width minus 40 mm.
5. The method for correcting the flatness defect of the finish rolling outlet strip steel according to claim 3, characterized in that:
determining a typical position along the width direction of the strip steel in the step S3, which specifically comprises the following steps:
5 typical positions are sequentially determined from the transmission side to the working side along the width direction, wherein the positions are respectively W1, W2, W3, W4 and W5,
wherein, the first and the second end of the pipe are connected with each other,
w1: at the position of 40mm in the width direction,
w2: at the position of 1/4 of the width,
w3: at the center of the width, the width of the film,
w4: at the position of 3/4 of the width,
w5: the strip steel width minus 40 mm.
6. The method for correcting the flatness defect of the finish rolling outlet strip steel according to claim 5, characterized in that:
the determining of the edge error determination coefficient according to the flatness of each typical position in step S4 specifically includes:
A ds ＝F w1 /F w2
A ws ＝F w5 /F w4
wherein the content of the first and second substances,
F w1 : flatness at W1;
F w2 : flatness at W2;
F w4 : flatness at W4;
F w5 : flatness at W5;
A ds : the edge part discrimination coefficient of the transmission side;
A ws : the edge part discrimination coefficient of the working side.
7. The method for correcting the flatness defect of the finish rolling outlet strip steel according to claim 6, characterized in that:
the error types in step S5 include a first type, a second type, a third type and a fourth type,
the first type is as follows: f w1 ≤5&A ds ≤G T &C i ≥5；
The second type is as follows: f w1 ≤5&A ds ≤G T &C i ＜5；
The third type is as follows: f w5 ≤5&A ws ≤G T &C i ≤-5；
The fourth type is as follows: f w5 ≤5&A ws ≤G T &C i ＞-5；
Wherein the content of the first and second substances,
G T : the abnormal threshold value is related to the thickness of the strip steel and ranges from 0.05 to 0.1;
C i : and (4) measuring the deviation amount of the finish rolling outlet width gauge at the ith moment in mm.
8. The method for correcting the flatness defect of the finish rolling outlet strip steel according to claim 7, wherein the method comprises the following steps:
the correction processing performed based on the first type of error specifically includes:
will be original W ij Corrected to XW ij And according to the corrected XW ij Value of F w1 、F w2 、F w3 、F w4 、F w5 The error data correction is realized by the calculation of (1); using the corrected data to complete the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
the original W ij Corrected to XW ij According to the following: XW ij ＝W ij -C i Completing the process;
the bonding i ＝(F w1 +F w5 )/2-F w3 ；
Said Leveling i ＝F w1 -F w5 ；
Wherein, i: the ith moment; j: the position of the laser transmitter irradiation from the transmission side to the working side; w is a group of ij : width position, unit: mm.
9. The method for correcting the flatness defect of the finish rolling outlet strip steel according to claim 7, wherein the method comprises the following steps:
the correction processing performed based on the second type of error specifically includes:
at this time F w1 To be ineffective, use F w2 、F w4 Substitute F w1 Completing the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
the Bending i ＝2×(F w2 +2×F w5 )/3-2×F w4 ；
Said level i ＝(4×F w5 -F w2 )/3-F w4 。
10. The method for correcting the flatness defect of the finish rolling outlet strip steel according to claim 7, wherein the method comprises the following steps:
the correction processing performed based on the error of the third type specifically includes:
will be original W ij Corrected to XW ij And according to the corrected XW ij Value of F w1 、F w2 、F w3 、F w4 、F w5 The error data correction is realized by the calculation of (1); using the corrected data to complete the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
the said will be original W ij Corrected to XW ij According to the following: XW ij ＝W ij +C i Completing the process;
the bonding i ＝(F w1 +F w5 )/2-F w3 ；
Said level i ＝F w1 -F w5 ；
Wherein, i: the ith moment; j: the position of the laser transmitter irradiation from the transmission side to the working side; w is a group of ij : width position, unit: mm.
11. The method for correcting the flatness defect of the finish rolling outlet strip steel according to claim 7, wherein the method comprises the following steps:
the correction processing performed based on the fourth type of error specifically includes:
at this time F w5 To be ineffective, use F w2 、F w4 Substitute F w5 Completing the calculation of the symmetrical wave defect Bending and the asymmetrical wave defect Leveling of the strip steel flatness defect,
the Bending i ＝2×(F w4 +2×F w1 )/3-2×F w2 ；
Said level i ＝(F w4 -4×F w1 )/3+F w2 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010474909.6A CN113732073B (en) | 2020-05-29 | 2020-05-29 | Correction method for flatness defect of finish rolling outlet strip steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010474909.6A CN113732073B (en) | 2020-05-29 | 2020-05-29 | Correction method for flatness defect of finish rolling outlet strip steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113732073A CN113732073A (en) | 2021-12-03 |
| CN113732073B true CN113732073B (en) | 2023-04-11 |
Family
ID=78724600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010474909.6A Active CN113732073B (en) | 2020-05-29 | 2020-05-29 | Correction method for flatness defect of finish rolling outlet strip steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113732073B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116803561B (en) * | 2023-08-23 | 2023-10-27 | 太原科技大学 | Board convexity measuring method of quasi-Gaussian distribution |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1249217A (en) * | 1998-08-25 | 2000-04-05 | 株式会社东芝 | Planeness control device for hot-rolling mill |
| JP2000135506A (en) * | 1998-10-28 | 2000-05-16 | Sumitomo Metal Ind Ltd | Method of rolling plate with reversible rolling mill |
| CN1980752A (en) * | 2004-07-06 | 2007-06-13 | Sms迪马格股份公司 | Method and device for measuring and adjusting the evenness and/or tension of a special steel strip or special steel film in a multi-roll stand, particularly in a 20-roll sendzimir rolling machine |
| KR20090003106A (en) * | 2007-06-28 | 2009-01-09 | 가부시키가이샤 히타치세이사쿠쇼 | Crown controlling device and method for hot rolled mill |
| CN101837374A (en) * | 2009-03-20 | 2010-09-22 | 西门子Vai金属科技有限公司 | Edge flatness monitoring |
| CN103341503A (en) * | 2013-05-21 | 2013-10-09 | 首钢总公司 | Self-adaptation convexity change hot rolled plate shape control model |
| CN106540968A (en) * | 2016-06-16 | 2017-03-29 | 中冶赛迪工程技术股份有限公司 | The compensation method of cold rolled sheet shape measured value and device |
-
2020
- 2020-05-29 CN CN202010474909.6A patent/CN113732073B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1249217A (en) * | 1998-08-25 | 2000-04-05 | 株式会社东芝 | Planeness control device for hot-rolling mill |
| JP2000135506A (en) * | 1998-10-28 | 2000-05-16 | Sumitomo Metal Ind Ltd | Method of rolling plate with reversible rolling mill |
| CN1980752A (en) * | 2004-07-06 | 2007-06-13 | Sms迪马格股份公司 | Method and device for measuring and adjusting the evenness and/or tension of a special steel strip or special steel film in a multi-roll stand, particularly in a 20-roll sendzimir rolling machine |
| KR20090003106A (en) * | 2007-06-28 | 2009-01-09 | 가부시키가이샤 히타치세이사쿠쇼 | Crown controlling device and method for hot rolled mill |
| CN101837374A (en) * | 2009-03-20 | 2010-09-22 | 西门子Vai金属科技有限公司 | Edge flatness monitoring |
| CN103341503A (en) * | 2013-05-21 | 2013-10-09 | 首钢总公司 | Self-adaptation convexity change hot rolled plate shape control model |
| CN106540968A (en) * | 2016-06-16 | 2017-03-29 | 中冶赛迪工程技术股份有限公司 | The compensation method of cold rolled sheet shape measured value and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113732073A (en) | 2021-12-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5069608B2 (en) | Sheet width control device and control method for hot rolling mill | |
| CN104307892B (en) | The method of band head correction in tandem rolling crossing process | |
| JP6003583B2 (en) | Shape evaluation method, steel plate shape correction method, and steel plate manufacturing method | |
| CN113732073B (en) | Correction method for flatness defect of finish rolling outlet strip steel | |
| CN107433287A (en) | A kind of hot-rolling flying shears shear the dynamic control method of original position end to end | |
| CN113649420A (en) | Temper mill rolling force obtaining method and device | |
| JP5251427B2 (en) | Metal plate thickness control device and plastic coefficient estimation function setting method | |
| JP4705275B2 (en) | Optimal position setting and control method for rolling rolls and guides during asymmetric shape rolling | |
| JP6597679B2 (en) | Method for evaluating strain of steel sheet | |
| CN111159649A (en) | Cold continuous rolling mill variable specification risk prediction method | |
| JP7207448B2 (en) | Method for calculating corrected position of steel plate and method for manufacturing steel plate | |
| JP3327236B2 (en) | Cluster rolling mill and plate shape control method | |
| JPS6277110A (en) | Dimension and shape straightening apparatus for hot rolling steel plate | |
| JP2825428B2 (en) | Strip crown control method in rolling mill | |
| JPH049207A (en) | Control method of bend and wedge of rolled stock in hot rough rolling and hot rough rolling equipment | |
| JP6566012B2 (en) | Straightening method for tapered steel sheet | |
| JP5565214B2 (en) | Thickness control method of rolling mill | |
| WO2022163177A1 (en) | Steel-sheet walking amount measurement device, steel-sheet walking amount measurement method, hot-rolling equipment for hot-rolled steel strip, and hot-rolling method for hot-rolled steel strip | |
| WO2024013976A1 (en) | System for controlling cutting by crop shear | |
| KR20130002405A (en) | Apparatus for detecting shape of slab in hot rolling and method thereof | |
| JP4213433B2 (en) | Edge drop control device for rolling mill | |
| JP3189721B2 (en) | Estimation method of thickness of tapered steel plate | |
| JP2774070B2 (en) | Method for controlling dimensions and shape of section steel | |
| JP3300202B2 (en) | Rolling force control method in temper rolling of steel strip | |
| JP3135114B2 (en) | Automatic correction method for the distance between dies in a press-type width reduction device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |