CN111380615A - Indirect measurement and online regulation and control method for welding temperature of H-shaped steel - Google Patents
Indirect measurement and online regulation and control method for welding temperature of H-shaped steel Download PDFInfo
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- CN111380615A CN111380615A CN202010018072.4A CN202010018072A CN111380615A CN 111380615 A CN111380615 A CN 111380615A CN 202010018072 A CN202010018072 A CN 202010018072A CN 111380615 A CN111380615 A CN 111380615A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
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- 230000033228 biological regulation Effects 0.000 title claims abstract description 10
- 238000005259 measurement Methods 0.000 title claims abstract description 8
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- 238000009529 body temperature measurement Methods 0.000 claims description 7
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- 230000006698 induction Effects 0.000 description 5
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- 238000001125 extrusion Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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Abstract
The invention discloses an indirect measurement and online regulation and control method for welding temperature of H-shaped steel, which comprises the following steps of ① setting an initial production speed V and an initial power supply output power P, ① 3 selecting M × (2n +1) points and collecting position parameters, ③ collecting temperature of points to be measured, ④ constructing a heat transfer model, obtaining temperature of corresponding points on the inner surface of an upper wing plate of the H-shaped steel through the heat transfer model, ⑤ constructing an interpolation model, ⑥ obtaining axial interpolation temperature and transverse interpolation temperature through the interpolation model, ⑦ judging whether an interpolation result is reliable or not through the axial interpolation temperature and the transverse interpolation temperature, obtaining temperature values at the welding points and executing a step ① 0 if the interpolation result is reliable, if the interpolation result is not reliable, returning to a step ④ to correct the heat transfer model, ⑧ judging whether the temperature at the welding points is in an optimum welding temperature range or not, if the temperature is not, executing a step ① 1, otherwise, adjusting power and production speed, ① 2 detecting whether a production stop signal is input, if the circulation is present, and returning to a closed loop monitoring step ② if the present.
Description
Technical Field
The invention relates to the field of H-shaped steel, in particular to an indirect measurement and online regulation and control method for welding temperature of H-shaped steel.
Background
The H-shaped steel is also called I-shaped steel, and has light weight, strong bending resistance, good rigidity and excellent mechanical property. At present, two methods of hot rolling forming and welding forming are mainly adopted for producing the common H-shaped steel, wherein the thick-wall H-shaped steel is produced by a hot rolling method, and the thin-wall H-shaped steel is produced by an induction welding method. When the thin-wall H-shaped steel is in induction welding, an alternating magnetic field generated by an induction coil generates induction eddy currents on the H-shaped steel, the eddy currents are concentrated at the positions, to be welded, of wing plates and webs under the action of a skin effect and a proximity effect, the wing plates and the webs are rapidly heated to reach a welding state through the heat effect of current, and the wing plates and the webs are fused together under the action of extrusion force of a squeezing roller to complete welding. In actual production, the welding temperature of the H-shaped steel is an important parameter in the production process. The welding temperature is too high, the overburning is easy, and a through hole is formed at the welding seam; the welding temperature is too low, which can cause cold welding and other defects, and influence the product quality. In the welding production, due to the blocking of the squeeze roll and the positioning roll, the welding seam of the H-shaped steel is shielded by the wing plate, and the fog and other factors generated by the cooling liquid are influenced, so that the welding temperature at the welding point cannot be directly measured, and the parameters such as the welding speed and the like are more difficult to adjust according to the real-time welding temperature.
At present, China is mainly concerned with devices and methods in the field of H-shaped steel and temperature measurement, for example, Chinese patent CN106269910A is an invention in the field of H-shaped steel forming control; the chinese patent CN110455422A relates to a wireless temperature measuring device, but the device can only measure temperature under a better environment, and can only measure the temperature at a single position; chinese patent CN106766976A application discloses a temperature measuring device for detecting the internal temperature of an industrial furnace, but it can only be applied to measuring the temperature of a single location and requires direct contact; after the research of dozens of invention patents in the field of induction welding H-shaped steel and the field of temperature measurement, the conventional device and method can not solve the problem that the temperature at a welding point can not be directly measured in real time in the welding production of the H-shaped steel, and the welding quality can not be ensured.
Disclosure of Invention
The invention provides an indirect measurement and online regulation method for welding temperature of H-shaped steel, which can accurately and quickly calculate the temperature at a welding point in real time through a heat transfer model and an interpolation calculation model according to the measured temperature at a selected position on the outer surface of an upper wing plate of the H-shaped steel on site, thereby online regulating production parameters, realizing closed-loop control, improving the welding production efficiency and ensuring the welding quality of the H-shaped steel.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an indirect measurement and online regulation and control method for welding temperature of H-shaped steel comprises the following steps:
① setting the initial production speed as V and the initial power output as P;
② adjusting the position of wing plate temperature measurement assembly, selecting M groups of positions to be measured on the outer surface of the wing plate on the H-shaped steel, selecting 2n +1 points on each group of positions to be measured, and collecting position parameters
Establishing a coordinate system by taking the position right above the welding point on the outer surface of the upper wing plate of the H-shaped steel as a coordinate origin, and numbering the point of each group of positions to be measured in the middle of the welding line as M0Point M to be measured0The numbers of two adjacent points are respectively M-1、M+1The positions of the other points are analogized in the same way;
③ wing plate temperature measurement component for collecting temperature of selected position on outer surface of wing plate on H-shaped steel
④ is expressed in rho, k,
c. t is a parameter of the model and,
constructing a heat transfer model for solving the temperature of the designated point mapping position on the inner surface and the outer surface of the upper wing plate as a substitute variable
The following;
in the formula:
rho- - - -density, kg/m3；
k- -the thermal conductivity of the material, k ═ k0·μ，W/m℃；
k0-thermal conductivity of isotropic material, W/m ℃;
mu-thermal conductivity correction factor, mu is more than or equal to 1.1 and less than or equal to 1.5, and the minimum value of mu is initially set to 1.1;
c- -specific heat capacity, J/kg ℃;
t- -time, s;
the temperature of a designated point on the inner surface of the upper wing plate can be obtained by the control cabinet through the heat transfer model
⑤ making the straight line at the welding point of the inner surface of the upper wing plate of the H-shaped steel be v, and calculating by interpolation of the structureThe model can determine the temperature value corresponding to 2n +1 points on the line v, where v0Interpolation calculation model constructed for welding points
The following;
in the formula:
based on each temperature measuring point mnAlong the temperature of each point on the straight line v obtained by axial interpolation,
based on each temperature measuring point m0The temperature value at the welding point is obtained by interpolation along the axial direction;
is composed of
The m-th order interpolation polynomial;
⑥, will
Carry over to the interpolation model of step ⑤
In, calculating by interpolation
Temperature of the welding point obtained by dividing along the axial direction interpolation based on the straight line v
The temperature value of each point is transversely interpolated to calculate the temperature of the welding point;
⑦ weld point temperature obtained by axial interpolation
Temperature of welding point calculated by transverse interpolation
The comparison is carried out in such a way that,
if the absolute value of the difference between the two is less than or equal to 25 ℃, the temperature of the welding point calculated by interpolation is in accordance with the real situation, and the temperature value at the welding point is taken as
And proceeds to step ⑧;
if the absolute value of the difference is greater than 25 deg.C, it indicates that the interpolated temperature of the welding point is not in accordance with the real condition, and the procedure returns to step ④ to modify the constructed heat transfer model
The thermal conductivity coefficient correction factor mu is made to be mu + delta mu, the temperature of the designated point mapping position of the inner surface and the outer surface of the upper wing plate is calculated again, and the temperature of the welding point is calculated by interpolation again;
⑧ mixing T with0Is compared with the optimum welding temperature range of 1350 ℃ +/-30 ℃ if T0Within this temperature range, the current production speed and power are maintained and step ⑨ is performed;
if T0When the temperature is lower than 1320 ℃, the power output power P is increased, and P + delta P is enabled1The control system collects the signal and returns to step ②;
if T0When the temperature is higher than 1380 ℃, the production speed V is increased, and V is enabled to be V + delta V1The control system collects the signal and returns to step ②;
⑨, detecting whether there is a stop signal input, if yes, ending the cycle, if no, collecting signal by the control system, and returning to step ② to realize the closed loop control of welding temperature.
Due to the adoption of the technical scheme, the invention has the technical progress that:
1. the indirect measurement and online regulation and control method for the welding temperature of the H-shaped steel realizes closed-loop control of the temperature at the welding point, can accurately control the welding temperature and ensures the welding quality.
2. The temperature value at the welding point is verified by comparing the axial interpolation and the transverse interpolation, so that the accuracy of the temperature interpolation result at the welding point is ensured.
3. The invention can ensure that the temperature of the welding point is always kept in the optimal welding temperature range, and has high automation degree and simple operation.
Drawings
FIG. 1 is a flow chart of the process of the present invention.
Fig. 2 is a side view of the invention showing the selected temperature measurement point.
Fig. 3 is a top view of the temperature measurement point of the present invention.
Fig. 4 is a perspective view of an embodiment of the present invention.
The device comprises a control cabinet 1, a cylinder conveyor 2, an H-shaped steel 3, an H-shaped steel 4, a rack 5, a squeeze roller 6, a wing plate temperature measuring component 7, a coil 8, a high-frequency power supply 9, a wing plate positioning component 10, an upper wing plate 11, a web plate 12, a lower wing plate 13, a web plate positioning component 14, a floor 15, a positioning wheel 16, a motor 17, a first lead 18, a second lead 19 and a third lead.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
as shown in fig. 4, a control cabinet 1, a cylinder conveyor 2, a frame 4, a high-frequency power supply 8, a wing plate positioning component 9, a web plate positioning component 13 and a motor 16 are respectively fixed on a floor 14, a squeeze roller 5 is installed in the frame 4, and the motor 16 connected with the frame 4 provides power for the squeeze roller 5; the extrusion roller 5 extrudes the upper wing plate 10 and the lower wing plate 12, so that the upper wing plate 10 and the lower wing plate 12 can be tightly attached to the web plate 11 to complete welding; the wing plate positioning component 9 can fix the upper wing plate 10 and the lower wing plate 12, the web plate positioning component 13 prevents the web plate 11 from shaking up and down, the positioning wheel 15 is installed on the frame, and the positioning wheel 15 is in contact with the web plate 11 to prevent the web plate 11 from shaking left and right; the position of the coil 7 is fixed on the high-frequency power supply 8, and the coil 7 is sleeved outside the upper wing plate 10, the web plate 11 and the lower wing plate 12; the wing plate temperature measuring component 6 is fixed on the side, close to the non-welded side, of the frame 4, 2n +1 colorimetric thermometers are arranged on the wing plate temperature measuring component 6 in total, and the temperature of 2n +1 points on the outer surface of the upper wing plate 10 can be correspondingly detected in real time; the cylinder conveyor 2 conveys the welded H-shaped steel 3 to the rear; the control cabinet 1 is connected with the high-frequency power supply 8 through a first lead 17, the control cabinet 1 is connected with the motor 16 through a second lead 18, and the control cabinet 1 is connected with the wing plate temperature measuring assembly 6 through a third lead 19.
The using method comprises the following steps:
as shown in fig. 1 to 4, when the production is started, the control cabinet 1 is operated, the high-frequency power supply 8 is electrified to the coil 7, the motor 16 rotates to drive the squeeze roller 5 to rotate, and the welding is started, wherein the initial production speed is V, and the output power of the initial high-frequency power supply 8 is P; adjusting the position of the wing plate temperature measuring component 6, selecting M groups of positions to be measured on the outer surface of the upper wing plate 10, selecting 2n +1 points on each group of positions to be measured, and collecting position parameters of the positions
A coordinate system is established for the origin of coordinates right above the welding point on the outer surface of the wing plate 10, and the serial number of the point of each group of positions to be measured positioned in the middle of the welding line is M0Point M to be measured0The numbers of two adjacent points are respectively M-1、M+1And the positions of other points are analogized in the same way, and the wing plate temperature measuring component 6 acquires the temperature of the selected position on the outer surface of the upper wing plate 10
And passing the temperature signal through a thirdThe wire 19 is transmitted to the control cabinet 1;
rho, k,
c. t is a parameter of the model and,
the heat transfer model is constructed for substituting variables, namely the temperatures of the designated point antipodal positions on the inner surface and the outer surface of the upper wing plate 10
The following;
in the formula:
rho- - - -density, kg/m3；
k- -thermal conductivity of the isotropic material, W/m DEG C
k0-thermal conductivity of isotropic material, W/m ℃;
mu-thermal conductivity correction factor, mu is more than or equal to 1.1 and less than or equal to 1.5, and the minimum value of mu is initially set to 1.1;
c- -specific heat capacity, J/kg DEG C
t- -time, s;
by the saidThe heat transfer model can be used for obtaining the temperature of a designated point on the inner surface of the upper wing plate 10 by the control cabinet 1
The control cabinet 1 selects a straight line at the welding point of the inner surface of the upper wing plate 10 as v, and the temperature value of the corresponding 2n +1 point on the straight line v can be calculated through a constructed interpolation calculation model, wherein v0Interpolation calculation model constructed for welding points
The following;
in the formula:
based on each temperature measuring point mnAlong the temperature of each point on the straight line v obtained by axial interpolation,
based on each temperature measuring point m0The temperature value at the welding point is obtained by interpolation along the axial direction;
is composed of
The m-th order interpolation polynomial;
will be provided with
Carry over to the interpolation model of step ⑤
In, calculating by interpolation
Is based onThe temperature of the welding point obtained by the interpolation along the axial direction is divided on the straight line v
The temperature value of each point is calculated by horizontal interpolation;
at the moment, the control cabinet 1 already obtains two calculated welding point temperatures obtained by the heat transfer model and the interpolation calculation model in real time, and the welding point temperature obtained by axial interpolation
Temperature of welding point calculated by transverse interpolation
The comparison is carried out in such a way that,
if the absolute value of the difference between the two is less than or equal to 25 ℃, the temperature of the welding point calculated by interpolation is in accordance with the real situation, and the temperature value at the welding point is taken as
If the absolute value of the difference is more than 25 ℃, the temperature of the welding point calculated by interpolation is not consistent with the real condition, and the control cabinet 1 corrects the constructed heat transfer model
The thermal conductivity coefficient correction factor mu is made to be mu + delta mu, the temperature of the designated point mapping position of the inner surface and the outer surface of the upper wing plate is calculated again, and the temperature of the welding point is calculated by interpolation again; when the control cabinet 1 obtains the temperature value T at the welding point0Then, T is put0Is compared with the optimum welding temperature range of 1350 ℃ +/-30 ℃ if T0In the temperature range, the existing production speed and power supply power are maintained;
if T0When the temperature is lower than 1320 ℃, the power output power P is increased, and P + delta P is enabled1The control system collects signals, the control cabinet 1 adjusts the position of the wing plate temperature measuring component 6, reselects the temperature measuring position and re-enters the temperature measuring positionLine calculation;
if T0When the temperature is higher than 1380 ℃, the production speed V is increased, and V = V + delta V1The control system collects signals, the control cabinet 1 adjusts the position of the wing plate temperature measuring assembly 6, the temperature measuring position is selected again, and calculation is carried out again;
under the automatic closed-loop control regulation function, the welding point temperature is kept in the optimum welding temperature range all the time, the H-shaped steel 3 with excellent welding quality can be obtained, and the closed-loop control regulation of the welding temperature is stopped after the control cabinet 1 receives a signal for stopping production.
Claims (1)
1. An indirect measurement and online regulation and control method for H-shaped steel welding temperature is characterized in that: the method comprises the following steps:
①, setting the initial production speed as V and the initial power supply output power as P;
②, adjusting the position of the wing plate temperature measurement component, selecting M groups of positions to be measured on the outer surface of the wing plate on the H-shaped steel, selecting 2n +1 points on each group of positions to be measured, and collecting the position parameters
Establishing a coordinate system by taking the position right above the welding point on the outer surface of the upper wing plate of the H-shaped steel as a coordinate origin, and numbering the point of each group of positions to be measured in the middle of the welding line as M0Point M to be measured0The numbers of two adjacent points are respectively M-1、M+1The positions of the other points are analogized in the same way;
③, collecting the temperature of the selected position on the outer surface of the wing plate on the H-shaped steel by the wing plate temperature measuring component
④ in rho, k,
c. t is a parameter of the model and,
constructing a heat transfer model for solving the temperature of the designated point mapping position on the inner surface and the outer surface of the upper wing plate as a substitute variable
The following;
in the formula:
rho- - - -density, kg/m3；
k- -the thermal conductivity of the material, k ═ k0·μ，W/m℃；
k0-thermal conductivity of isotropic material, W/m ℃;
mu-thermal conductivity correction factor, mu is more than or equal to 1.1 and less than or equal to 1.5, and the minimum value of mu is initially set to 1.1;
c- -specific heat capacity, J/kg ℃;
t- -time, s;
the temperature of a designated point on the inner surface of the upper wing plate can be obtained by the control cabinet through the heat transfer model
⑤, making the straight line at the welding point of the inner surface of the upper wing plate of the H-shaped steel be v, and calculating the temperature value corresponding to 2n +1 points on the straight line v by the constructed interpolation calculation model, wherein v is0Interpolation calculation model constructed for welding points
The following;
in the formula:
the temperature of each point on a straight line v is obtained by interpolation along the axial direction based on the temperature of each temperature measuring point mn,
based on each temperature measuring point m0The temperature value at the welding point is obtained by interpolation along the axial direction;
is composed of
The m-th order interpolation polynomial;
⑥, will
Carry over to the interpolation model of step ⑤
In, calculating by interpolation
Temperature of the welding point obtained by dividing along the axial direction interpolation based on the straight line v
The temperature value of each point is transversely interpolated to calculate the temperature of the welding point;
⑦ weld point temperature obtained by axial interpolation
Temperature of welding point calculated by transverse interpolation
The comparison is carried out in such a way that,
if the absolute value of the difference between the two is less than or equal to 25 ℃, the temperature of the welding point calculated by interpolation is in accordance with the real situation, and the temperature value at the welding point is taken as
And proceeds to step ⑧;
if the absolute value of the difference is greater than 25 deg.C, it indicates that the interpolated temperature of the welding point is not in accordance with the real condition, and the procedure returns to step ④ to modify the constructed heat transfer model
The thermal conductivity coefficient correction factor mu is made to be mu + delta mu, the temperature of the designated point mapping position of the inner surface and the outer surface of the upper wing plate is calculated again, and the temperature of the welding point is calculated by interpolation again;
⑧, mixing T0Is compared with the optimum welding temperature range of 1350 ℃ +/-30 ℃ if T0Within this temperature range, the current production speed and power are maintained and step ⑨ is performed;
if T0When the temperature is lower than 1320 ℃, the power output power P is increased, and P + delta P is enabled1The control system collects the signal and returns to step ②;
if T0When the temperature is higher than 1380 ℃, the production speed V is increased, and V is enabled to be V + delta V1The control system collects the signal and returns to step ②;
⑨, detecting whether a production stop signal is input, if so, ending the circulation, otherwise, collecting the signal by the control system, and returning to step ② to realize the closed-loop control of the welding temperature.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113239594A (en) * | 2021-05-21 | 2021-08-10 | 燕山大学 | Method for improving welding quality of metal pipe |
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| CN106768380A (en) * | 2016-11-16 | 2017-05-31 | 西安建筑科技大学 | A kind of method that test result to infrared measurement of temperature equipment is modified |
| CN108009329A (en) * | 2017-11-23 | 2018-05-08 | 武汉大学 | A kind of method of the definite minimum duct length of 9%Cr refractory steel pipeline welding process evaluation |
| CN111283307A (en) * | 2018-12-06 | 2020-06-16 | 中国商用飞机有限责任公司 | Simulation welding method and device, terminal equipment and storage medium |
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Patent Citations (5)
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| JP2004091863A (en) * | 2002-08-30 | 2004-03-25 | Sumitomo Metal Ind Ltd | Steel member having excellent interpass temperature weldability and welded joint thereof |
| CN104002044A (en) * | 2014-06-03 | 2014-08-27 | 湖南大学 | Non-penetration laser welding apparatus and non-penetration laser welding method |
| CN106768380A (en) * | 2016-11-16 | 2017-05-31 | 西安建筑科技大学 | A kind of method that test result to infrared measurement of temperature equipment is modified |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113239594A (en) * | 2021-05-21 | 2021-08-10 | 燕山大学 | Method for improving welding quality of metal pipe |
| CN113239594B (en) * | 2021-05-21 | 2022-03-11 | 燕山大学 | Method for improving welding quality of metal pipe |
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Effective date of registration: 20211116 Address after: 065702 Xinzhang office Xinzhang Yi village, Bazhou City, Langfang City, Hebei Province Patentee after: Bazhou xinju Furniture Co., Ltd Address before: 066004 No. 438, Hebei Street, Haigang District, Qinhuangdao City, Hebei Province Patentee before: Yanshan University |