CN112179308A - Hot-rolled steel strip cross section contour local high point grading discrimination method - Google Patents
Hot-rolled steel strip cross section contour local high point grading discrimination method Download PDFInfo
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- CN112179308A CN112179308A CN202010950176.9A CN202010950176A CN112179308A CN 112179308 A CN112179308 A CN 112179308A CN 202010950176 A CN202010950176 A CN 202010950176A CN 112179308 A CN112179308 A CN 112179308A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile
Abstract
The invention relates to a hot-rolled steel strip cross section contour local high point grading discrimination method, which comprises the steps of obtaining measuring points uniformly distributed on a finish rolling mill outlet steel strip cross section contour, and grading discrimination is carried out on the obtained cross section contour measuring data of each steel strip length direction coordinate position. Based on the data of the multifunctional instrument, the automatic grading judgment of the local high points of the profile of the cross section of the hot rolled steel strip is realized, the problems of non-uniform local high point manual detection standard and low accuracy are solved, and the generation of batch defects is avoided. The automatic prompt of the local high point defect of the cross section profile of the hot rolled steel strip is realized, and an operator can take adjustment measures in time according to traffic light alarm information to eliminate or improve the local high point defect. The invention also provides a report function, records the grading judgment result of the full-length local high point of the hot rolled steel strip, provides a basis for the quality judgment of the steel strip on the one hand, and can guide the production of a downstream cold rolling procedure on the other hand, take measures in advance and avoid the generation of quality defects on the other hand.
Description
Technical Field
The invention belongs to the technical field of hot rolled steel strip production, and particularly relates to a hot rolled steel strip cross section contour local high point grading discrimination method.
Background
The production process flow of the hot rolled steel strip comprises the following steps: the steel billet is heated to a specified temperature by a heating furnace, taken out of the furnace, rolled by a roughing mill set, and then rolled by a finishing mill set to finally form a finished steel strip.
The local high point is a typical defect of the hot rolled strip, and the local high point means that the thickness of the hot rolled strip at a certain point of the cross section of the hot rolled strip is thicker than that of the adjacent area. The local high point defect can be inherited in the subsequent cold rolling production, and the defects of product peduncle mark, poor flatness and the like are caused. High quality cold rolled sheets such as automotive sheets, household electrical panels, etc. have strict requirements for local high points of the hot rolled stock.
The cross section profile of the hot-rolled steel strip is generally measured by a multifunctional instrument, but the instrument only provides measurement data, the judgment of local high points only depends on visual measurement of an operator according to a curve recorded by the multifunctional instrument displayed instantly, the manual judgment standard is not uniform, the dependence on experience is strong, and the generation of batch local high point defects is easy to cause. Therefore, how to realize the automatic grading judgment of the local high points of the cross section profile of the steel strip becomes a difficult problem to be solved urgently in the production of the hot rolled steel strip by various steel enterprises.
Disclosure of Invention
The invention aims to provide a method for grading and distinguishing local high points of a cross section profile of a hot-rolled steel strip.
The technical scheme adopted by the invention for solving the technical problems is as follows: a hot-rolled steel strip cross section contour local high point grading discrimination method comprises the following steps:
1) obtaining measuring point data of uniform distribution of the cross section profile of the hot rolled steel strip at the outlet of the finishing mill;
2) taking cross section profile measurement data of any length position, determining the central position Xmid of the width of the steel strip and the thickness Ymid of the position, and setting the height difference between the thickness of any point on the cross section profile line of the steel strip and the minimum thickness of the point close to the central position of the steel strip as a local high point value
3) Local high point value
Comparing with the grading standard threshold value, and if the local high point value is
When a set threshold value is reached, determining that a local high point exists in the position, and determining the grade of the local high point;
4) and taking the position of the local high point, the representative value of the local high point at the position and the grade of the local high point as the grading result of the local high point at the position.
Further, in the step 1), measuring points (x (N), y (N), z (M)) are obtained, wherein N is 0,1,2, …, N-1, M is 1,2,3, …, and M-1;
wherein:
x (n) is a coordinate in the width direction of the measured data of the cross section profile of the steel strip at the finish rolling outlet; taking the central line of the measuring instrument as a boundary, dividing the coordinate in the width direction into a positive value and a negative value, wherein the negative value is close to one side of an operator, and the positive value is far away from one side of the operator;
y (n) is the thickness value of the measured data of the cross section profile of the steel strip at the finish rolling outlet;
z (m) is a coordinate in the length direction of the finish rolling outlet steel strip;
n is the number of measured values in the width direction of the cross section profile of the finish rolling outlet steel strip, and the interval of width direction coordinates between the measured points is a constant C1;
m is the number of measurements of the profile of the cross section in the direction of the length of the strip at the outlet of the finish rolling, and the time interval between the measurement points is constant C2.
Further, for the measurement data of the cross-sectional profile curve (X (n), Y (n)) at any Z (m) position in the steel strip length direction, the central position (Xmid) in the steel strip width direction and the thickness (Ymid) at the position are positioned by the measurement data closest to the center line of the measuring instrument, and the profile curve is divided into a left part and a right part by taking the central position (Xmid, Ymid) in the steel strip width direction as a boundary;
the height difference between the thickness of any point on the cross section contour line of the steel strip and the minimum thickness of the point close to the center of the steel strip is called as a local high point value
Taking the X0 position as an example, the local high point value of the point is
Sequentially calculating local high point values of each position
Local high point values of each position to be calculated
And comparing the local high point value with a local high point grading standard, and grading and distinguishing the local high point value into a first grade, a second grade and a third grade according to the size of the local high point value.
Furthermore, the first level, the second level and the third level respectively correspond to green, yellow and red in the operation console, so that traffic light alarm is realized, and operators can take different adjustment measures according to different display colors.
The invention has the following beneficial effects:
the invention is based on the data of a multifunctional instrument, realizes the automatic grading judgment of the local high points of the cross section outline of the hot-rolled steel strip, solves the problems of non-uniform local high point manual detection standard and low accuracy, and avoids the generation of batch defects.
In addition, the invention realizes the automatic prompt of the local high point defect of the cross section outline of the hot rolled steel strip, and operators can take adjustment measures in time according to traffic light alarm information to eliminate or improve the local high point defect.
The invention provides a report function, records the grading judgment result of the full-length local high point of the hot rolled steel strip, provides a basis for the quality judgment of the steel strip on the one hand, and can guide the production of a downstream cold rolling procedure on the other hand, take measures in advance and avoid the generation of quality defects on the other hand.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.
A hot-rolled steel strip cross section contour local high point grading discrimination method comprises the following steps:
1) obtaining measuring point data of uniform distribution of the cross section profile of the hot rolled steel strip at the outlet of the finishing mill;
2) taking cross section profile measurement data of any length position, determining the central position Xmid of the width of the steel strip and the thickness Ymid of the position, and setting the height difference between the thickness of any point on the cross section profile line of the steel strip and the minimum thickness of the point close to the central position of the steel strip as a local high point value
3) Local high point value
Comparing with the grading standard threshold value, and if the local high point value is
When a set threshold value is reached, determining that a local high point exists in the position, and determining the grade of the local high point;
4) and taking the position of the local high point, the representative value of the local high point at the position and the grade of the local high point as the grading result of the local high point at the position.
Further, in the step 1), measuring points (x (N), y (N), z (M)) are obtained, wherein N is 0,1,2, …, N-1, M is 1,2,3, …, and M-1;
wherein:
x (n) is a coordinate in the width direction of the measured data of the cross section profile of the steel strip at the finish rolling outlet; taking the central line of the measuring instrument as a boundary, dividing the coordinate in the width direction into a positive value and a negative value, wherein the negative value is close to one side of an operator, and the positive value is far away from one side of the operator;
y (n) is the thickness value of the measured data of the cross section profile of the steel strip at the finish rolling outlet;
z (m) is a coordinate in the length direction of the finish rolling outlet steel strip;
n is the number of measured values in the width direction of the cross section profile of the finish rolling outlet steel strip, and the interval of width direction coordinates between the measured points is a constant C1;
m is the number of measurements of the profile of the cross section in the direction of the length of the strip at the outlet of the finish rolling, and the time interval between the measurement points is constant C2.
Further, for the measurement data of the cross-sectional profile curve (X (n), Y (n)) at any Z (m) position in the steel strip length direction, the central position (Xmid) in the steel strip width direction and the thickness (Ymid) at the position are positioned by the measurement data closest to the center line of the measuring instrument, and the profile curve is divided into a left part and a right part by taking the central position (Xmid, Ymid) in the steel strip width direction as a boundary;
the height difference between the thickness of any point on the cross section contour line of the steel strip and the minimum thickness of the point close to the center of the steel strip is called as a local high point value
Taking the X0 position as an example, the local high point value of the point is
Sequentially calculating local high point values of each position
Local high point values of each position to be calculated
And comparing the local high point value with a local high point grading standard, and grading and distinguishing the local high point value into a first grade, a second grade and a third grade according to the size of the local high point value.
The local high point grading standard is determined according to factors such as the final use of the steel strip, the target thickness and the like, and the local high point thickness grading standard is shown in table 1.
TABLE 1 local high Point thickness grading Standard
The result of local high point classification will be called traffic light alarm in the operation desk, the three-color alarm information is shown in table 2, and the result of local high point classification is shown in table 3. The first-level display is green, which represents that the steel strip has no local high-point defects influencing the product quality; the second level shows 'yellow', which represents that the steel strip has local high-point defects slightly influencing the product quality and needs to be repaired; the three levels show red, which represents that the steel strip has local high-point defects which seriously affect the product quality and need degradation treatment. The operator can take different adjustment measures according to different display colors to eliminate or improve the local high point defect.
TABLE 2 three-color alarm information
| Grading situation | First stage | Second stage | Three-stage |
| Alarm information | Green colour | Yellow colour | Red colour |
TABLE 3 local high Point grading discrimination results
The embodiment provides a method for grading and distinguishing local high points of the cross section profile shape of a hot-rolled steel strip, and measured data of the cross section profile of the steel strip are measured by a multifunctional instrument. The widthwise interval C1 is 4mm, and the lengthwise interval C2 is 2 s.
The measured data are shown in the following table 4:
table 4 measurement data of a coil of steel strip
| Steel coil number | Length position, m | Width position, cm | Thickness in cm | Measuring time |
| H24205075381 | 20.30971 | -784.04529 | 4.94364 | 2020/5/28 12:31:50 |
| H24205075381 | 20.30971 | -780.00623 | 4.94536 | 2020/5/28 12:31:50 |
| H24205075381 | 20.30971 | -775.96716 | 4.94391 | 2020/5/28 12:31:50 |
| H24205075381 | 20.30971 | -771.9281 | 4.95029 | 2020/5/28 12:31:50 |
| … | … | … | … | … |
| H24205075381 | 20.30971 | 758.87659 | 4.92748 | 2020/5/28 12:31:50 |
| H24205075381 | 20.30971 | 762.91565 | 4.92366 | 2020/5/28 12:31:50 |
| H24205075381 | 20.30971 | 766.95471 | 4.92882 | 2020/5/28 12:31:50 |
| H24205075381 | 20.30971 | 770.99147 | 4.92768 | 2020/5/28 12:31:50 |
| H24205075381 | 34.01504 | -782.90277 | 4.92666 | 2020/5/28 12:31:52 |
| H24205075381 | 34.01504 | -778.86361 | 4.93326 | 2020/5/28 12:31:52 |
| H24205075381 | 34.01504 | -774.82444 | 4.93696 | 2020/5/28 12:31:52 |
| H24205075381 | 34.01504 | -770.78528 | 4.94054 | 2020/5/28 12:31:52 |
| … | … | … | … | … |
| H24205075381 | 34.01504 | 751.97974 | 4.93792 | 2020/5/28 12:31:52 |
| H24205075381 | 34.01504 | 756.0189 | 4.93733 | 2020/5/28 12:31:52 |
| H24205075381 | 34.01504 | 760.05806 | 4.93688 | 2020/5/28 12:31:52 |
| H24205075381 | 34.01504 | 764.09723 | 4.91995 | 2020/5/28 12:31:52 |
| … | … | … | … | … |
| H24205075381 | 413.40234 | -781.44623 | 4.94766 | 2020/5/28 12:32:44 |
| H24205075381 | 413.40234 | -777.40706 | 4.95321 | 2020/5/28 12:32:44 |
| H24205075381 | 413.40234 | -773.3679 | 4.95696 | 2020/5/28 12:32:44 |
| H24205075381 | 413.40234 | -769.32873 | 4.95986 | 2020/5/28 12:32:44 |
| … | … | … | … | … |
| H24205075381 | 413.40234 | 753.43628 | 4.98284 | 2020/5/28 12:32:45 |
| H24205075381 | 413.40234 | 757.47544 | 4.96906 | 2020/5/28 12:32:45 |
| H24205075381 | 413.40234 | 761.51461 | 4.95898 | 2020/5/28 12:32:45 |
| H24205075381 | 413.40234 | 765.55377 | 4.96486 | 2020/5/28 12:32:45 |
For the cross-sectional profile data at the length position 20.30971m, the widthwise central position Xmid ═ 0.46716mm and Ymid ═ 4.99429mm were taken, and the measurement data are shown in table 5.
TABLE 5 measurement data of 20.30971m length position of a coil of steel strip
| Steel coil number | Length position | Position of width | Thickness of | Measuring time | |
| H24205075381 | 20.30971 | -784.04529 | 4.94364 | 2020/5/28 12:31:50 | |
| H24205075381 | 20.30971 | -780.00623 | 4.94536 | 2020/5/28 12:31:50 | |
| H24205075381 | 20.30971 | -775.96716 | 4.94391 | 2020/5/28 12:31:50 | |
| H24205075381 | 20.30971 | -771.9281 | 4.95029 | 2020/5/28 12:31:50 | |
| H24205075381 | 20.30971 | -767.88904 | 4.94783 | 2020/5/28 12:31:50 | |
| … | … | … | … | … | |
| H24205075381 | 20.30971 | -8.54529 | 4.997989 | 2020/5/28 12:31:50 | |
| H24205075381 | 20.30971 | -4.50623 | 4.99862 | 2020/5/28 12:31:50 | |
| H24205075381 | 20.30971 | -0.46716 | 4.99429 | 2020/5/28 12:31:50 | Center position |
| H24205075381 | 20.30971 | 3.5719 | 4.99574 | 2020/5/28 12:31:50 | |
| H24205075381 | 20.30971 | 7.61096 | 4.99388 | 2020/5/28 12:31:50 | |
| … | … | … | … | … | |
| H24205075381 | 20.30971 | 754.83752 | 4.92924 | 2020/5/28 12:31:50 | |
| H24205075381 | 20.30971 | 758.87659 | 4.92748 | 2020/5/28 12:31:50 | |
| H24205075381 | 20.30971 | 762.91565 | 4.92366 | 2020/5/28 12:31:50 | |
| H24205075381 | 20.30971 | 766.95471 | 4.92882 | 2020/5/28 12:31:50 | |
| H24205075381 | 20.30971 | 770.99147 | 4.927682 | 2020/5/28 12:31:50 |
The width position is close to one side of an operatorFor example, local high-point values for each width position are calculated
As shown in table 6.
TABLE 6 local high point value of a coil of steel strip
The local high point values at each location were compared to the ranking criteria to determine the ranking results, as shown in table 7.
TABLE 7 results of grading local high points of a coil of steel strip
The results of the local high point classification are output in the form of a report, and generally, only the results classified into two levels or more are output, as shown in table 8.
TABLE 8 local high Point discrimination results
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (4)
1. A hot-rolled steel strip cross section contour local high point grading discrimination method is characterized by comprising the following steps:
1) obtaining measuring point data of uniform distribution of the cross section profile of the hot rolled steel strip at the outlet of the finishing mill;
2) taking cross section profile measurement data of any length position, determining the central position Xmid of the width of the steel strip and the thickness Ymid of the position, and setting the height difference between the thickness of any point on the cross section profile line of the steel strip and the minimum thickness of the point close to the central position of the steel strip as a local high point value
3) Local high point value
Comparing with the grading standard threshold value, and if the local high point value is
When a set threshold value is reached, determining that a local high point exists in the position, and determining the grade of the local high point;
4) and taking the position of the local high point, the representative value of the local high point at the position and the grade of the local high point as the grading result of the local high point at the position.
2. The method of discriminating a local high spot of a cross-sectional profile of a hot-rolled steel strip according to claim 1, wherein the step 1) obtains measurement points (x (N), y (N), z (M)) where N is 0,1,2, …, N-1, M is 1,2,3, …, M-1;
wherein:
x (n) is a coordinate in the width direction of the measured data of the cross section profile of the steel strip at the finish rolling outlet; taking the central line of the measuring instrument as a boundary, dividing the coordinate in the width direction into a positive value and a negative value, wherein the negative value is close to one side of an operator, and the positive value is far away from one side of the operator;
y (n) is the thickness value of the measured data of the cross section profile of the steel strip at the finish rolling outlet;
z (m) is a coordinate in the length direction of the finish rolling outlet steel strip;
n is the number of measured values in the width direction of the cross section profile of the finish rolling outlet steel strip, and the interval of width direction coordinates between the measured points is a constant C1;
m is the number of measurements of the profile of the cross section in the direction of the length of the strip at the outlet of the finish rolling, and the time interval between the measurement points is constant C2.
3. The method of judging local high point classification of the cross-sectional profile of a hot-rolled steel strip according to claim 2, wherein for the measured data of the cross-sectional profile curve (X (n), Y (n)) at an arbitrary Z (m) position in the steel strip longitudinal direction, the center position (Xmid, Ymid) in the steel strip width direction and the thickness (Ymid) at the position are located by the measured data closest to the center line of the measuring instrument, and the profile curve is divided into two parts, i.e., left and right, by taking the center position (Xmid, Ymid) in the steel strip width direction as a boundary;
the height difference between the thickness of any point on the cross section contour line of the steel strip and the minimum thickness of the point close to the center of the steel strip is called as a local high point value
Taking the X0 position as an example, the local high point value of the point is
Sequentially calculating local high point values of each position
Local high point values of each position to be calculated
Comparing with local high point grading standard, grading and distinguishing according to local high point valueIs a first level, a second level and a third level.
4. The method for discriminating the local high points of the cross section profile of the hot-rolled steel strip according to claim 3, wherein the first, second and third levels correspond to green, yellow and red respectively in an operation table, and realize traffic light alarm, so that operators can take different adjustment measures according to different display colors.
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Application publication date: 20210105 |