CN113378370B - Method for evaluating temperature uniformity of hot-rolled strip steel in width direction - Google Patents
Method for evaluating temperature uniformity of hot-rolled strip steel in width direction Download PDFInfo
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Abstract
The invention discloses a method for evaluating temperature uniformity of hot-rolled strip steel in the width direction, and relates to the technical field of hot-rolled strip steel. The invention discloses a method for evaluating the temperature uniformity of a hot-rolled strip steel in the width direction, which comprises the steps of adding temperature measuring lines, generating temperature data of the temperature measuring lines, processing the data to determine edge position points of the strip steel, converting relative coordinates into absolute position points of the strip steel in the width direction, and finally determining the average value of the temperature of the strip steel in the width direction by adopting an integral mode; the point corresponding to the temperature data of the temperature measuring line A derived by the analysis software is a relative position point B of a shooting picture space, and a position point which is not the actual width of the strip steel needs to be converted; the method also comprises the steps of calculating the temperature drop values of the edges of the operation side and the transmission side of the hot-rolled strip steel, simply and objectively calculating the temperature drop values of the operation side and the transmission side of the hot-rolled strip steel in the width direction, and finally quantitatively evaluating the temperature uniformity of the hot-rolled strip steel.
Description
Technical Field
The invention relates to the technical field of hot-rolled strip steel, in particular to a method for evaluating the temperature uniformity of the hot-rolled strip steel in the width direction.
Background
In the production process of hot-rolled strip steel, the temperature uniformity in the width direction is always a key factor influencing the product performance uniformity. The temperature drop of the operation side and the transmission side of the strip is obviously faster than that of the middle position, so that the temperature nonuniformity in the width direction is objectively caused, and technicians only reduce the difference by carrying out a large amount of work on a cooling mode, but how to quantitatively evaluate the temperature nonuniformity in the width direction of the hot-rolled strip is a problem which the technicians have to face.
The infrared thermal imager uses an infrared detector and an optical imaging objective to receive an infrared radiation energy distribution pattern of a measured object and reflect the infrared radiation energy distribution pattern on a photosensitive element of the infrared detector so as to obtain an infrared thermal imaging image, the thermal imaging image corresponds to the thermal distribution of the surface of an object, and the obtained thermal imaging image is guided into a computer so as to obtain the temperature data of any position of the shot image by using special analysis software. The invention utilizes the infrared thermal imager to measure the temperature of the hot-rolled strip steel, utilizes the random attached analysis software to derive the temperature data, and utilizes the technical scheme of the invention to evaluate the temperature uniformity in the width direction.
The retrieved Chinese invention patent with the application number of 201810462776.3 discloses a device and a method for measuring the heating temperature uniformity of a steel billet, wherein a temperature recorder is arranged on the surface of the steel billet before the steel billet enters a furnace; the thermocouple is arranged at the bottom of the measuring hole in the steel billet before the steel billet enters the furnace; measuring the internal temperature of the steel billet by a thermocouple in the heating process of the steel billet; after the steel billet is discharged from the furnace, acquiring an upper surface temperature image and a lower surface temperature image of the steel billet through a lens, a grating, a detector and an imaging device; and analyzing the temperature data in the steel billet, the upper surface temperature image and the lower surface temperature image by using a computer to obtain the heating temperature uniformity of the steel billet. The invention mainly solves the problem of evaluating the temperature uniformity in the width direction in the billet heating process, and does not explain the temperature distribution condition in the width direction of the intermediate billet in the rolling process.
For another example, a chinese patent application No. 201911041378.5 discloses a method for evaluating temperature uniformity of a hot-rolled strip steel intermediate slab in the width direction. According to the method, after the thermal imaging graph is filled with grids through Photoshop software, the temperature drop value and the width of a temperature drop area are calculated in a grid counting mode, but the workload is large, and certain personal subjectivity exists.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention provides a method for evaluating the temperature uniformity of a hot-rolled strip steel in the width direction, aiming at the problems of large workload, low objectivity and the like in the calculation of a temperature drop value and the width of a temperature drop area in the prior art.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a method for evaluating the temperature uniformity of hot-rolled strip steel in the width direction comprises the following steps:
adding a temperature measuring line and generating temperature data of the temperature measuring line;
step two, determining the position points of the edges of the strip steel through data processing: the conduction rate of heat conduction in the air is obviously different from that of the strip steel, so that the temperature data value derived from the line A has an obvious turning point, the temperature change condition is determined by subtracting the temperature of the former position point from the temperature of the latter position point, and the point with the maximum temperature turning is taken as the edge position point of the strip steel;
converting the relative coordinates into strip steel width absolute position points;
step four, determining the temperature mean value T of the strip steel in the width direction in an integration mode ave 。
According to the further technical scheme, in the step one, a thermal imaging graph of the hot-rolled strip steel is selected, a line tool is selected in analysis software, a temperature measuring line A is added, the line A needs to cross the width direction of the strip steel and is perpendicular to a rolling center line, and then the temperature data of each point of the line A is led out to a table by means of a data leading-out function option of the analysis software.
In the second step, the operating side and the transmission side are respectively a point a and a point b, and the corresponding temperatures are respectively T a And T b 。
In the third step, the point corresponding to the temperature data of line a derived by the analysis software is the relative position point B of the shooting picture space, the numerical values of B are 1, 2, 3, 4 and the like in sequence, and are analogized in sequence, but not the position point of the actual width of the strip steel, so that conversion is needed. And (3) setting the actual width of the measured strip steel as L, and setting the numerical values of the corresponding relative position points of the point a and the point b as c and d respectively, wherein the numerical formula of the width L of the strip steel corresponding to each relative position point is as follows: l = (B-c) × (L/(d-c)). Through the conversion, the point corresponding to the temperature data of each point of the line A is converted into the value of the point at the width position, and the value of the width l of the strip steel has a negative value because the line A traverses the strip steel.
In the fourth step, the formula for calculating the temperature mean value in the width direction of the strip steel by adopting an integral mode is as follows:
wherein, T ave : average temperature value in the width direction of the strip steel, DEG C;
T ave : average temperature value in the width direction of the strip steel, DEG C;
l 1 : starting point of casting blank width, mm;
l 3 : the end point of the width of the casting blank is mm;
t: the temperature value at each point of the A line is in DEG C.
The further technical scheme comprises the following steps of calculating the temperature drop values of the edges of the operation side and the transmission side of the hot rolled strip steel, wherein the temperature drop of the operation side is as follows: delta T Operation of ＝T ave -T a To transmitThe temperature drop of the moving side is as follows: delta T Transmission gear ＝T ave -T b The temperature drop values of the operation side and the transmission side in the width direction of the hot rolled strip steel are simply and objectively calculated, and finally the temperature uniformity of the hot rolled strip steel can be quantitatively evaluated.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) According to the method for evaluating the temperature uniformity of the hot-rolled strip steel in the width direction, firstly, temperature measuring lines are added, temperature data of the temperature measuring lines are generated, the data are processed to determine the edge position points of the strip steel, then, relative coordinates are converted into absolute position points of the strip steel in the width direction, and finally, the average value of the temperature of the strip steel in the width direction is determined in an integral mode, so that the edge temperature drop condition of the strip steel in the width direction is simply, conveniently and objectively reflected;
(2) The invention relates to a method for evaluating the temperature uniformity of a hot-rolled strip steel in the width direction, wherein a point corresponding to A line temperature data derived by analysis software is a relative position point B of a shooting picture space, the actual width of the measured strip steel is set as L, the relative position point values corresponding to a point a and a point B are respectively c and d, and the numerical formula of the width L of the strip steel converted from the corresponding relative position points is as follows: l = (B-c) × (L/(d-c)), thereby converting the position points of the non-strip steel actual width;
(3) The invention discloses a method for evaluating the temperature uniformity of a hot-rolled strip steel in the width direction, which further comprises the following steps of calculating the temperature drop values of the edges of the operation side and the transmission side of the hot-rolled strip steel, wherein the temperature drop of the operation side is as follows: delta T Operation of ＝T ave -T a The temperature of the transmission side is as follows: delta T Transmission device ＝T ave -T b The temperature drop values of the operation side and the transmission side in the width direction of the hot rolled strip steel are simply and objectively calculated, and finally the temperature uniformity of the hot rolled strip steel can be quantitatively evaluated.
Drawings
FIG. 1 is a schematic view of an increased temperature measurement line A in a thermal imaging of a hot rolled strip;
FIG. 2 is a schematic diagram of the temperature curve of the temperature measuring line A according to the present invention;
FIG. 3 is a schematic diagram of the temperature calculation of the present invention;
FIG. 4 is a schematic view showing the widthwise temperature of a hot rolled strip after laminar cooling in the present invention.
Detailed Description
For a further understanding of the invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
Example 1
The method for evaluating the temperature uniformity of the hot-rolled strip steel in the width direction comprises the following steps as shown in fig. 3:
adding a temperature measuring wire and generating temperature data of the temperature measuring wire;
step two, data processing to determine the strip steel edge position points: the conduction rate of heat conduction in air is obviously different from that of the strip steel, so that the temperature data value derived from the line A has an obvious turning point, the temperature change condition is determined by subtracting the temperature of the former position point from the temperature of the latter position point, and the point with the maximum temperature turning is taken as the edge position point of the strip steel;
converting the relative coordinates into strip steel width absolute position points;
step four, determining the temperature mean value T of the strip steel in the width direction in an integration mode ave 。
In the first step, as shown in figure 1, selecting a thermal imaging graph of a hot-rolled strip steel, selecting a line tool in analysis software, adding a temperature measuring line A, wherein the line A needs to cross the width direction of the strip steel and is vertical to a rolling central line, and then exporting data function options of the analysis software to export temperature data of each point of the line A into a table; in the second step, the operating side and the transmission side are respectively a point a and a point b, and the corresponding temperatures are respectively T a And T b (ii) a In the third step, the point corresponding to the a-line temperature data derived by the analysis software is the relative position point B of the shooting picture space, the numerical values of B are 1, 2, 3, 4 and the like in sequence, and are not the position points of the actual width of the strip steel, so that conversion is needed. Setting the actual width of the measured strip steel as L, and the numerical values of the corresponding relative position points of the point a and the point b as c and d respectively, then each relative position point isThe numerical formula of the width l of the strip steel converted from the position point correspondence is as follows: l = (B-c) × (L/(d-c)). The point corresponding to each point temperature data of the line A is converted into a width position point value through conversion, the value of the width l of the strip steel has a negative value because the A crosses the strip steel, and the temperature curve of the line A drawn after conversion is shown in figure 2; in the fourth step, as shown in fig. 3, the formula for calculating the temperature mean value in the width direction of the strip steel by adopting an integral method is as follows:
wherein, tave: the average temperature value in the width direction of the strip steel is DEG C;
tave: the average temperature value in the width direction of the strip steel is DEG C;
l1: starting point of casting blank width, mm;
l3: the end point of the width of the casting blank is mm;
t: the temperature value of each point of the A line is in DEG C.
Through the steps, the temperature drop condition of the edge part in the width direction of the strip steel is simply, conveniently and objectively reflected.
Example 2
The basic structure of the method for evaluating the temperature uniformity of the hot-rolled strip steel in the width direction is the same as that of the embodiment 1, and the differences and improvements are as follows: the method also comprises the following steps of calculating the temperature drop values of the edges of the operation side and the transmission side of the hot-rolled strip steel, wherein the temperature drop of the operation side is as follows: delta T Operation of ＝T ave -T a The temperature of the transmission side is as follows: delta T Transmission device ＝T ave -T b The temperature drop values of the operation side and the transmission side in the width direction of the hot rolled strip steel are simply and objectively calculated, and finally the temperature uniformity of the hot rolled strip steel can be quantitatively evaluated.
In this example, the temperature data of a hot-rolled steel strip after laminar cooling was measured and calculated using a hot-rolled steel strip of 8 × 1625mm produced by a certain steel mill as an example, and fig. 4 shows the results. From the data calculated in FIG. 4, the temperature drop of the strip of this specification after laminar cooling was 43.9 ℃ at the drive side and 33.4 ℃ at the process side.
The present invention and its embodiments have been described above schematically, and the description is not intended to be limiting, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (4)
1. A method for evaluating the temperature uniformity of a hot-rolled strip steel in the width direction is characterized by comprising the following steps:
adding a temperature measuring line and generating temperature data of the temperature measuring line;
step two, determining the position points of the edges of the strip steel through data processing: subtracting the temperature of the former position point from the temperature of the latter position point to determine the change condition of the temperature, and taking the point with the maximum temperature turning as the edge position point of the strip steel;
converting the relative coordinates into strip steel width absolute position points; the point corresponding to the A line temperature data derived by the analysis software is a relative position point B of a shooting picture space, the actual width of the measured strip steel is set to be L, the relative position point values corresponding to the point a and the point B are respectively c and d, and the width L numerical formula corresponding to each relative position point and converted into the strip steel is as follows: l = (B-c) × (L/(d-c)); the operating side and the transmission side are respectively a point a and a point b;
step four, determining the temperature mean value T of the strip steel in the width direction in an integration mode ave ；
Wherein, T ave : the average temperature value in the width direction of the strip steel is DEG C; l 1 : starting point of casting blank width, mm; l 3 : the end point of the width of the casting blank is mm; t: the temperature value at each point of the A line is in DEG C.
2. The method of claim 1 for evaluating the temperature uniformity of a hot-rolled strip in the width direction, wherein the method comprises the following steps: in the first step, a thermal imaging graph of the hot-rolled strip steel is selected, a line tool is selected in analysis software, a temperature measuring line A is added, the line A needs to cross the width direction of the strip steel and is perpendicular to a rolling central line, and then the temperature data of each point of the line A is exported to a table by utilizing a data exporting function option of the analysis software.
3. The method of claim 2, wherein the method comprises the following steps: in the second step, the operating side and the transmission side are respectively a point a and a point b, and the corresponding temperatures are respectively T a And T b 。
4. The method of claim 3 for evaluating the temperature uniformity of a hot-rolled strip in the width direction, wherein the method comprises the following steps: the method also comprises the following steps of calculating the temperature drop values of the edges of the operation side and the transmission side of the hot-rolled strip steel, wherein the temperature drop of the operation side is as follows: Δ T operation = Tave-Ta, drive side temperature drop is: Δ T drive = Tave-Tb.
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