CN110732559A - method for evaluating temperature uniformity of hot-rolled strip steel intermediate billet in width direction - Google Patents
method for evaluating temperature uniformity of hot-rolled strip steel intermediate billet in width direction Download PDFInfo
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- CN110732559A CN110732559A CN201911041378.5A CN201911041378A CN110732559A CN 110732559 A CN110732559 A CN 110732559A CN 201911041378 A CN201911041378 A CN 201911041378A CN 110732559 A CN110732559 A CN 110732559A
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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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
Abstract
The invention discloses a method for evaluating the temperature uniformity of an intermediate billet of hot-rolled strip steel in the width direction, which comprises the following steps of measuring the temperature of the intermediate billet in the hot rolling process by using a thermal imager, guiding a shot thermal imaging graph into a computer, processing image data by using thermal imaging analysis software, filling a cross grid into the thermal imaging graph by using Photoshop software, dividing the image into a plurality of grids, and mainly analyzing the edge temperature drop value of the intermediate billet and the width value of an edge temperature drop area by using the grids.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to methods for evaluating the temperature uniformity of a hot-rolled strip steel intermediate billet in the width direction.
Background
In the production process of hot-rolled strip steel, the edge part of an intermediate blank dissipates heat quickly, the temperature drop of the edge part is obviously larger than that of the middle part, fixed temperature drops also exist in the length direction of the intermediate blank, particularly in the head and tail parts of the intermediate blank, the temperature unevenness of the strip steel caused by the temperature drops in the width direction and the length direction is objective, and the temperature unevenness phenomenon strongly influences the rolling stability.
The thermal imaging instrument receives the infrared radiation energy distribution pattern of the measured object by using the infrared detector and the optical imaging objective lens and reflects the infrared radiation energy distribution pattern on a photosensitive element of the infrared detector so as to obtain an infrared thermal imaging graph, the thermal imaging graph corresponds to the thermal distribution of the surface of an object, the obtained thermal imaging graph is guided into a computer, and the temperature data of any position of the shot image can be obtained by using special analysis software.
Through retrieval, the Chinese patent application No. 201810462776.3 discloses a device and a method for measuring the heating temperature uniformity of billets, wherein a temperature recorder is arranged on the surface of a billet before the billet enters a furnace, a thermocouple is arranged at the bottom of a measuring hole in the billet before the billet enters the furnace, the internal temperature of the billet is measured through the thermocouple in the billet heating process, an upper surface temperature image and a lower surface temperature image of the billet are obtained through a lens, a grating, a detector and an imaging device after the billet exits the furnace, and the heating temperature uniformity of the billet is obtained through analysis of a computer on the basis of the internal temperature data, the upper surface temperature image and the lower surface temperature image of the billet.
Disclosure of Invention
The invention aims to provide methods for evaluating the temperature uniformity of an intermediate billet of a hot-rolled strip steel in the width direction, which can accurately and objectively reflect edge temperature drop data in the width direction of the strip steel and width data of a region where the temperature drop occurs, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
method for evaluating the temperature uniformity of the hot-rolled strip steel intermediate billet in the width direction, which comprises the following steps:
s1: measuring the temperature of the intermediate billet in the hot rolling process by using a thermal imager, and introducing a shot thermal imaging graph into a computer;
s2: processing the image data by using thermal imaging analysis software;
s3: filling a cross grid into the thermal imaging graph by using Photoshop software, dividing the image into a plurality of grids, and mainly analyzing the edge temperature drop value of the intermediate billet and the width value of the edge temperature drop area through the grids.
Further , the method includes adding temperature measuring lines and generating a temperature line graph, filling a lattice with Photoshop, calculating unit length of the temperature line graph, determining the start point and the end point of the temperature drop area, and calculating the temperature drop value and the width value of the edge temperature drop area.
And , adding temperature measuring lines and generating a temperature line graph, namely, guiding the thermal imaging graph into software, taking the temperature measuring lines in the width direction of the intermediate billet, wherein the length of the temperature measuring lines is longer than the width of the plate blank, and the temperature line graph of the temperature measuring lines is automatically generated in the software after the temperature measuring lines cross the width direction of the intermediate billet.
And , filling the Photoshop grid specifically comprises the step of adding the grid to the thermal imaging graph to which the temperature measurement lines are added, wherein the density of the grid lines is moderate, the accuracy requirement cannot be met if the density of the grid lines is too low, and the subsequent calculation workload is too large if the density of the grid lines is too high.
, the unit length of the temperature line graph is calculated by obtaining the width of the real-time shot slab in the steel rolling operation room, converting the width into the number of grids in the grid graph, converting the width into the actual width value represented by each grid, converting the number of grids occupied by the temperature measuring lines in the grid graph into the actual length represented by the temperature measuring lines, and calculating the ratio of the actual length to the total unit length in the temperature line graph to obtain the actual unit length value in the temperature line graph.
Further , the calculation of the temperature drop value and the width of the edge temperature drop region is specifically:
1) firstly, determining the starting point of a temperature drop area, wherein the starting point is determined to have two conditions, , a platform part with relatively uniform temperature exists in the middle position of a temperature measurement fold line, the temperature corresponding to the platform is taken as the starting point temperature of the temperature drop area, and in the second condition, when the temperature fluctuation is large, the point at which the slope on the left side of the fold line changes suddenly is taken as the starting point temperature of the temperature drop area;
2) next, the end point of the temperature drop region was determined, the conduction rate of heat conduction in air and the conduction rate in the billet were apparently different from , and the change of the tangent slope of the curve was apparently seen from the temperature rising portion at the left side portion of the line graph, wherein a point was suddenly changed, and the point was taken as the end point of the temperature drop region.
Compared with the prior art, the invention has the beneficial effects that:
the methods for evaluating the temperature uniformity of the intermediate billet of the hot-rolled strip steel in the width direction can accurately and objectively reflect the temperature drop data of the edge part of the strip steel in the width direction and the width data of the area where the temperature drop occurs, so as to solve the problem of evaluating the temperature uniformity of the width direction in the heating process of the existing billet and the problem that the temperature distribution condition of the intermediate billet in the width direction in the rolling process is not explained.
Drawings
FIG. 1 is a thermal imaging diagram displayed in software according to a second embodiment of the present invention;
FIG. 2 is a selected temperature measurement line A according to the second embodiment of the present invention;
FIG. 3 is a temperature measuring line graph produced by line A according to the second embodiment of the present invention;
FIG. 4 is a diagram of the second embodiment of the present invention after the grid is filled;
FIG. 5 is a diagram illustrating a unit length calculation method in a line graph according to a second embodiment of the present invention;
FIG. 6 is a temperature line graph generated by line A according to a second embodiment of the present invention;
fig. 7 is an imaging diagram of a head-tail portion temperature map according to a second embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.
Example :
in the embodiment of the invention, methods for evaluating the temperature uniformity of the hot-rolled strip steel intermediate billet in the width direction are provided, which comprise the following steps:
, measuring the temperature of the intermediate billet in the hot rolling process by a thermal imager, and introducing the shot thermal imaging graph into a computer;
the second step is that: processing the image data by using thermal imaging analysis software;
the third step: filling a cross grid into the thermal imaging graph by using Photoshop software, dividing the image into a plurality of grids, and mainly analyzing the edge temperature drop value of the intermediate billet and the width value of the edge temperature drop area through the grids.
In the above embodiment, the method further includes adding a temperature measuring line and generating a temperature line graph, filling a lattice with Photoshop, calculating unit length of the temperature line graph, determining a start point and an end point of the temperature drop region, and calculating a temperature drop value and a width value of the edge temperature drop region.
The adding of the temperature measuring line and the generation of the temperature line graph specifically comprise the following steps: and (3) importing the thermal imaging graph into software, taking a temperature measuring line in the width direction of the intermediate billet, wherein the length of the temperature measuring line is longer than the width of the slab, and the temperature measuring line crosses the width direction of the intermediate billet, so that a temperature broken line graph of the temperature measuring line is automatically generated in the software.
The Photoshop filled grid specifically comprises: and adding grids to the thermal imaging graph to which the temperature measurement lines are added, wherein the density of the grid lines is moderate, the precision requirement cannot be met if the density of the grid lines is too low, and the subsequent calculation workload is too large if the density of the grid lines is too high.
The calculation of the unit length of the temperature line graph specifically comprises the following steps: the width of a real-time shot slab is obtained in a steel rolling operation room, the width is converted into the number of grids occupied in a grid graph, the number of the grids occupied by temperature measuring lines in the grid graph is converted into the actual length represented by the temperature measuring lines, and the ratio of the actual length to the total unit length in a temperature line graph is calculated to obtain the actual unit length value in the temperature line graph.
The calculation of the temperature drop value and the width value of the edge temperature drop area specifically comprises the following steps:
1) firstly, determining the starting point of a temperature drop area, wherein the starting point is determined to have two conditions, , a platform part with relatively uniform temperature exists in the middle position of a temperature measurement fold line, the temperature corresponding to the platform is taken as the starting point temperature of the temperature drop area, and in the second condition, when the temperature fluctuation is large, the point at which the slope on the left side of the fold line changes suddenly is taken as the starting point temperature of the temperature drop area;
2) next, the end point of the temperature drop region was determined, the conduction rate of heat conduction in air and the conduction rate in the billet were apparently different from , and the change of the tangent slope of the curve was apparently seen from the temperature rising portion at the left side portion of the line graph, wherein a point was suddenly changed, and the point was taken as the end point of the temperature drop region.
To further explain the above invention in , the following specific examples, example two, are also provided:
taking thin high-strength steel QStE500TM-P produced by a certain steel mill as an example, the specification of an intermediate billet is 38.7 multiplied by 1290mm, and the specification of a finished product is 5 multiplied by 1250mm, aiming at the evaluation of temperature uniformity in the width direction, the temperature of five parts of the head part, the front part, the middle part, the rear part and the tail part of the strip steel is respectively measured to obtain five groups of data, thermal imaging images are respectively shot in the length direction of the head and the tail, the length of a head and tail low-temperature area is calculated, and the calculated data are shown in tables 1 and 2:
TABLE 1 data of temperature drop at edge in width direction
TABLE 2 head and tail position temperature drop data
Referring to fig. 1, a temperature image photographed by a thermal imager is imported to a computer;
referring to fig. 2, a temperature measurement line a is taken along the width direction of the intermediate billet;
referring to fig. 3, a temperature line graph of line a is generated in the software;
referring to fig. 4, the grid is populated using Photoshop software.
Referring to fig. 5, the generated temperature line graph is processed, the edge temperature drop value in the width direction and the width value of the edge temperature drop area are calculated by the line graph, the width data of the intermediate blank can be acquired from the console at each shooting, and the calculation process is described by taking the above image as an example.
Firstly, the starting point of the temperature drop area is determined, the two conditions exist in the determination of the starting point, , a platform part with relatively uniform temperature exists in the middle position of the temperature measurement broken line, the temperature corresponding to the platform is taken as the starting point temperature of the temperature drop area, and in the second condition, the point with abrupt change of the slope on the left side of the broken line is taken as the starting point temperature of the temperature drop area when the temperature fluctuation is large.
Referring to fig. 6, for the above case, lines m parallel to the horizontal axis are drawn by the average value of the platform, the intersection point of the straight line m and the th point on the left side of the line graph is defined as point B, straight lines l perpendicular to the horizontal axis pass through point B, and the point B is defined as the horizontal coordinate of the starting point of the temperature drop zone.
And then determining the end point of the temperature drop region, wherein the conduction rate of heat conduction in air and the billet is obviously different from , the change of the tangent slope of the curve can be obviously seen from the temperature rising part at the left side part in the line graph, wherein points are suddenly changed, the point is taken as the end point of the temperature drop region, the point is taken as the point A in the graph, vertical lines are drawn through the point A, the intersection point of the point A and the horizontal axis is taken as the point a, and the point a is set as the horizontal coordinate of the end point of the temperature drop region.
The coordinates of the start point and the end point of the temperature drop zone are obtained by the above calculation, the difference is the width value Δ L of the side temperature drop zone, and the intersection points of m and n with the ordinate are the temperatures of the start point and the end point of the temperature drop zone, and the difference is the temperature drop value Δ T of the side.
The longitudinal temperature is evaluated as the longitudinal temperature variation of the head and tail positions, and three temperature measurement lines A, B and C are taken in the software for the shot thermal imaging chart, as shown in FIG. 7.
The temperature uniformity of the head and tail parts can be evaluated by the same method when the width direction is calculated, and the length of the low-temperature zone of the head and tail parts can be obtained by calculation.
In conclusion, the methods for evaluating the temperature uniformity of the hot-rolled strip steel intermediate billet in the width direction can accurately and objectively reflect the edge temperature drop data in the width direction of the strip steel and the width data of the area where the temperature drop occurs.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (6)
1, method for evaluating the temperature uniformity of the hot-rolled strip steel intermediate billet in the width direction, which is characterized by comprising the following steps:
s1: measuring the temperature of the intermediate billet in the hot rolling process by using a thermal imager, and introducing a shot thermal imaging graph into a computer;
s2: processing the image data by using thermal imaging analysis software;
s3: filling a cross grid into the thermal imaging graph by using Photoshop software, dividing the image into a plurality of grids, and mainly analyzing the edge temperature drop value of the intermediate billet and the width value of the edge temperature drop area through the grids.
2. The method of kinds of evaluation on the temperature uniformity of the hot rolled strip steel intermediate billet in the width direction, according to claim 1, comprises adding temperature measuring lines and generating a temperature line graph, filling grids with Photoshop, calculating the unit length of the temperature line graph, determining the start point and the end point of a temperature drop zone, calculating the temperature drop value and the width value of an edge temperature drop zone.
3. The method for evaluating the widthwise temperature uniformity of an intermediate slab of hot-rolled steel strip as claimed in claim 2, wherein the adding of temperature measurement lines and the generation of a temperature line graph are carried out by introducing a thermal imaging graph into software, taking a temperature measurement line in the widthwise direction of the intermediate slab, the length of the temperature measurement line being longer than the width of the slab, crossing the widthwise direction of the intermediate slab, and automatically generating a temperature line graph of the temperature measurement line in the software.
4. The method for evaluating the temperature uniformity of the hot-rolled strip steel intermediate billet in the width direction as claimed in claim 2, wherein the Photoshop filled grid is characterized in that the grid is added to the thermal imaging graph to which temperature measuring lines are added, the density of grid lines is moderate, the accuracy requirement cannot be met if the density of grid lines is too low, and the subsequent calculation workload is too large if the density of grid lines is too high.
5. The method for evaluating the temperature uniformity in the width direction of the intermediate slab of hot-rolled steel strip as claimed in claim 2, wherein the calculation of the unit length of the temperature line graph is specifically that the width of the slab taken immediately in the steel rolling operation room is obtained, the width is converted into the number of grids occupied in the grid graph, the width is converted into the actual width value represented by each grid, the number of grids occupied by the temperature measuring lines in the grid graph is converted into the actual length represented by the temperature measuring lines, and the ratio is calculated according to the actual length and the total unit length in the temperature line graph to obtain the actual unit length value in the temperature line graph.
6. The methods for evaluating the temperature uniformity of an intermediate slab of hot-rolled strip steel in the width direction as claimed in claim 2, wherein the calculation of the temperature drop value and the width value of the edge temperature drop region specifically comprises:
1) firstly, determining the starting point of a temperature drop area, wherein the starting point is determined to have two conditions, , a platform part with relatively uniform temperature exists in the middle position of a temperature measurement fold line, the temperature corresponding to the platform is taken as the starting point temperature of the temperature drop area, and in the second condition, when the temperature fluctuation is large, the point at which the slope on the left side of the fold line changes suddenly is taken as the starting point temperature of the temperature drop area;
2) next, the end point of the temperature drop region was determined, the conduction rate of heat conduction in air and the conduction rate in the billet were apparently different from , and the change of the tangent slope of the curve was apparently seen from the temperature rising portion at the left side portion of the line graph, wherein a point was suddenly changed, and the point was taken as the end point of the temperature drop region.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111515258A (en) * | 2020-04-17 | 2020-08-11 | 马鞍山钢铁股份有限公司 | Method for measuring surface temperature transverse distribution of hot-rolled intermediate billet |
| CN111618104A (en) * | 2020-06-03 | 2020-09-04 | 北京首钢股份有限公司 | Slab hot rolling temperature drop detection method |
| CN113378370A (en) * | 2021-06-04 | 2021-09-10 | 马鞍山钢铁股份有限公司 | Method for evaluating temperature uniformity of hot-rolled strip steel in width direction |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111515258A (en) * | 2020-04-17 | 2020-08-11 | 马鞍山钢铁股份有限公司 | Method for measuring surface temperature transverse distribution of hot-rolled intermediate billet |
| CN111515258B (en) * | 2020-04-17 | 2021-11-02 | 马鞍山钢铁股份有限公司 | Method for measuring surface temperature transverse distribution of hot-rolled intermediate billet |
| CN111618104A (en) * | 2020-06-03 | 2020-09-04 | 北京首钢股份有限公司 | Slab hot rolling temperature drop detection method |
| CN113378370A (en) * | 2021-06-04 | 2021-09-10 | 马鞍山钢铁股份有限公司 | Method for evaluating temperature uniformity of hot-rolled strip steel in width direction |
| CN113378370B (en) * | 2021-06-04 | 2023-03-14 | 马鞍山钢铁股份有限公司 | Method for evaluating temperature uniformity of hot-rolled strip steel in width direction |
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