CN112380688B - Method for determining casting blank temperature and furnace feeding temperature, storage medium and processor - Google Patents
Method for determining casting blank temperature and furnace feeding temperature, storage medium and processor Download PDFInfo
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- 238000005266 casting Methods 0.000 title claims abstract description 410
- 238000000034 method Methods 0.000 title claims abstract description 105
- 238000003860 storage Methods 0.000 title claims abstract description 10
- 230000008859 change Effects 0.000 claims abstract description 32
- 239000002245 particle Substances 0.000 claims description 72
- 238000010438 heat treatment Methods 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 30
- 238000012546 transfer Methods 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 23
- 239000007790 solid phase Substances 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 26
- 238000004364 calculation method Methods 0.000 description 24
- 229910000831 Steel Inorganic materials 0.000 description 22
- 239000010959 steel Substances 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 16
- 238000009749 continuous casting Methods 0.000 description 14
- 239000000126 substance Substances 0.000 description 9
- 229910001566 austenite Inorganic materials 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
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- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
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- 229910001562 pearlite Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- 238000003672 processing method Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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Abstract
The invention provides a method for determining casting blank temperature and furnace feeding temperature, a storage medium and a processor. The method for determining the temperature of the hot-feed hot-charging casting blank comprises the following steps: step S10: establishing a casting blank model; step S20: establishing an equipment model; step S30: determining the corresponding relation between a casting blank model and an equipment model; step S40: judging whether the steps S10 to S30 are wrong, if at least one step is wrong, repeatedly executing the steps S10 to S30, and if the steps are wrong, executing the step S50; step S50: calculating a temperature field of the casting blank model, and determining a temperature evolution curve; step S60: and judging whether the temperature evolution curve and the temperature change curve are consistent, if so, determining the temperature of the casting blank according to the temperature evolution curve, and if not, repeatedly executing the steps S10 to S50. The technical scheme of the invention can accurately determine the temperature of the casting blank in the hot feeding and hot charging process.
Description
Technical Field
The invention relates to the technical field of casting blank production, in particular to a method for determining casting blank temperature and furnace feeding temperature, a storage medium and a processor.
Background
The hot feeding and hot charging technology of continuous casting blank refers to the technology of fully and effectively utilizing the sensible heat of continuous casting blank in the technological process of steelmaking, continuous casting and continuous rolling, and directly or indirectly conveying the hot continuous casting blank into a heating furnace in the continuous rolling process for heat supplementing or soaking and then rolling so as to achieve the aim of greatly saving energy. The hot feeding and hot charging technology of the continuous casting blank changes steelmaking, continuous casting and continuous rolling into a tightly connected integrated production system, so that not only can the energy consumption be greatly reduced and the production period of the product be shortened, but also the product quality can be obviously improved, the metal yield can be improved, the occupied area of a factory building can be reduced, and the investment can be saved. Therefore, the hot feeding and hot charging technology of the continuous casting billet has high economic value from the viewpoint of saving production cost and investment.
The tube blank for producing the seamless steel tube is mostly cooled naturally and then sawed, and then enters an annular heating furnace for heating, and the temperature of the tube blank is generally lower and is close to the room temperature when entering the furnace. The pipe blank in the hot feeding and hot charging process is cut off by flame in a hot state and then enters an annular heating furnace for heating at a temperature which is hundreds of degrees higher than the room temperature. The temperature of the hot-charged tube blank entering the annular heating furnace has an important influence on whether cracks are generated on the surface of the finished steel tube, whether abnormal structures exist in the internal structure and whether grains are coarse or not.
The hot-feeding hot-packed continuous casting billet with the temperature between 400 ℃ and A is not cooled to the ambient temperature, and is firstly fed into an annular heating furnace for heating and then rolled to obtain the finished steel pipe. According to the solid-state phase transition theory of metals, the structure state of the hot-charged continuous casting billet is basically the same as that of a casting billet charged in a conventional cold furnace, and in theory, qualified steel pipes can be produced by using the pipe blank (namely the hot-charged continuous casting billet).
Theoretical studies have shown that the maximum temperature of each particle on the tube blank should be less than A (about 727 ℃). When the temperature of the particles existing on the tube blank is higher than A, the transformation from austenite to ferrite does not occur or the degree of the transformation is small on the surface of the tube blank, so AlN (aluminum nitride) and other carbonitrides precipitated at the austenite grain boundaries are always remained at the austenite grain boundaries during the cooling process of the tube blank, the binding force among the austenite grains is reduced by the substances, and the claw breakage defect occurs during the rolling process after heating. If the temperature of each particle on the tube blank is less than A, austenite to ferrite and ferrite to pearlite transformation can occur on the surface of the tube blank, the transformation can lead to steel recrystallization, and AlN and other carbonitrides precipitated on the prior austenite grain boundary can be wrapped in the new pearlite crystal grains, so that the weakening effect of AlN and other carbonitrides on the grain boundary on the inter-crystal is eliminated, the bonding force between the crystals is strengthened again, and the tube blank is not easy to generate claw cracking defects on the surface after being heated and rolled.
During the cooling process, the cooling rate of each particle inside and outside the tube blank changes with the change of factors such as time, steel grade, blank diameter, position and the like. The temperature of each particle on the tube blank is different because the cooling rates of the inside and outside of the tube blank are different. Since the internal temperature of the tube blank cannot be measured directly, the maximum temperature of each particle on the tube blank is difficult to determine.
At present, when the hot feeding and hot charging process is carried out, the furnace feeding temperature of the common steel grade tube blank is generally determined by adopting an industrial test method. The method comprises the steps of firstly, manually measuring the surface temperature of the tube blank, estimating the internal temperature of the tube blank according to the measured surface temperature of the tube blank, and then determining whether the tube blank enters an annular heating furnace to be heated according to the surface temperature and the internal temperature of the tube blank. Whether the quality of the produced steel pipe meets the process requirement or not is verified by industrial production of the produced steel pipe, such as metallographic structure detection, mechanical property detection and the like of the produced steel pipe, and if the quality is not feasible, the temperature of the pipe blank when entering the annular heating furnace is reduced.
However, the estimation method (that is, the method of estimating the internal temperature of the tube blank based on the measured external surface temperature of the tube blank) lacks scientific basis and accuracy, and when the tube blank with the actual diameter Φ330 is cooled for about 4000 seconds, the maximum deviation of the temperature of each particle inside and outside the tube blank can reach about 180 ℃, and when the temperature deviation of each particle on the external surface of the tube blank can reach about 100 ℃, the estimation method generally has no definite reference point, so that the measurement itself is not suitable. The method for determining the furnace inlet temperature of the tube blank by the industrial test method has the defects of large error, high cost and low efficiency.
Accordingly, there is a need to provide a method of determining the temperature of a hot-feed hot-charged billet to accurately determine the temperature of the billet in the hot-feed hot-charging process.
Disclosure of Invention
The invention mainly aims to provide a method for determining the temperature of a casting blank and the temperature of a furnace entering, a storage medium and a processor, so as to accurately determine the temperature of the casting blank in a hot feeding and hot charging process.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method of determining a temperature of a hot-feed hot-charged cast slab, comprising: step S10: establishing a casting blank model of a current casting blank; step S20: establishing an equipment model of equipment for conveying casting blanks; step S30: determining the corresponding relation between a casting blank model and an equipment model; step S40: a checking step, including a step of judging whether or not there is an error in the steps S10 to S30, if at least one of the steps S10 to S30 is an error, repeating the steps S10 to S30, and if none of the steps S10 to S30 is an error, executing the step S50; step S50: calculating a temperature field of the casting blank model, and determining a temperature evolution curve of the casting blank model; step S60: the judging step comprises the step of judging whether the temperature evolution curve accords with the temperature change curve of the casting blank which is actually detected, if so, determining the temperature of the casting blank according to the temperature evolution curve, and if not, repeatedly executing the steps S10 to S50.
Further, step S10 includes: step S11: establishing a current geometric model of a casting blank; step S12: and establishing a casting blank model according to the material of the casting blank and the physicochemical parameters of the casting blank corresponding to the material.
Further, in step S11, a geometric model of the casting blank is determined according to the geometric shape and the geometric dimension of the casting blank, wherein the ratio of the length dimension of the casting blank to the radial dimension of the casting blank ranges from 3 to 4; alternatively, in step S12, the physicochemical parameters of the cast slab include at least one of strength, poisson' S ratio, coefficient of thermal expansion, heat capacity, stress-strain curve, heat transfer coefficient of the cast slab, and emissivity of the cast slab; or in step S11, determining a geometric model of the casting blank according to the geometric shape and the geometric dimension of the casting blank, wherein the ratio of the length dimension of the casting blank to the radial dimension of the casting blank ranges from 3 to 4; in step S12, the physicochemical parameters of the cast slab include at least one of strength, poisson' S ratio, coefficient of thermal expansion, heat capacity, stress-strain curve, heat transfer coefficient of the cast slab, and emissivity of the cast slab.
Further, step S20 includes: step S21: establishing a geometric model of equipment for conveying casting blanks; step S22: and establishing an equipment model according to the material of the equipment and the physical and chemical parameters of the equipment corresponding to the material.
Further, in step S21, a geometric model of the device is determined from the geometric shape and the geometric dimensions of the device; alternatively, in step S22, the physicochemical parameter of the device includes at least one of a heat transfer coefficient of the device and an emissivity of the device; alternatively, in step S21, a geometric model of the device is determined from the geometry and geometry of the device; in step S22, the physicochemical parameter of the device includes at least one of a heat transfer coefficient of the device and an emissivity of the device.
Further, step S30 includes: step S31: determining the relative position between a casting blank model and an equipment model; step S32: at least one of a heat transfer coefficient and a friction coefficient between the casting blank model and the equipment model is determined.
Further, after step S11, before step S40, the method for determining a temperature of a hot-feed hot-charged cast slab further includes a step of gridding the cast slab model to obtain a gridded cast slab model; alternatively, the step of determining whether or not there is an error in step S10 to step S30 of step S40 includes the step of determining whether or not the parameters in step S10 to step S30 are accurate.
Further, step S50 includes: step S51: determining particles to be detected on a casting blank model; step S52: determining the initial temperature of a casting blank model; step S53: determining an initial temperature of the device model; step S54: and calculating a temperature field of the casting blank model by a finite element method, and obtaining a temperature evolution curve of particles to be detected on the casting blank model.
Further, in step S52, the solidification point at which the casting mold is changed from the liquid phase to the solid phase according to the material of the casting mold is set as the initial temperature of the casting mold.
Further, before step S60, the method for determining the temperature of the hot-feed hot-fill casting blank further includes a step of determining a temperature change curve of particles to be detected on the casting blank that is actually detected; or, in step S60, the step of determining whether the temperature evolution curve matches with the temperature change curve of the actually detected casting blank includes the step of determining whether the difference between the temperature of the particles to be detected on the casting blank model and the temperature of the particles to be detected on the actually detected casting blank is within a preset range when the cooling time of the casting blank model and the casting blank is the same.
According to another aspect of the present invention, there is provided a method of determining a casting blank charging temperature, comprising: step S70: determining the current temperature value of a casting blank; step S80: judging whether the current temperature value of the casting blank is smaller than or equal to a preset value, if so, executing the step of enabling the casting blank to enter a heating furnace, and if not, executing the step of cooling the casting blank; in step S70, the current temperature value of the casting blank is determined according to the method for determining the temperature of the hot-feed hot-charge casting blank.
According to another aspect of the present invention, there is provided a storage medium storing a program, wherein the program is executed to perform the above method of determining a casting blank charging temperature.
According to another aspect of the present invention, there is provided a processor for running a program, wherein the program is run to perform the above method of determining a casting blank charging temperature.
By applying the technical scheme of the invention, a casting blank model and an equipment model of equipment for conveying casting blanks are established, the corresponding relation between the casting blank model and the equipment model is determined, the checking step of the step S40 can ensure that the temperature field of the casting blank model is calculated under the condition of no errors from the step S10 to the step S30, that is, the step S50 is executed, the temperature evolution curve of the casting blank model can be obtained through the calculated temperature field of the casting blank model, that is, the temperature field of the casting blank can be simulated through the step S50, then the judging step of the step S60 can compare the temperature evolution curve of the casting blank model obtained by simulating the temperature field of the casting blank with the actually detected temperature change curve of the casting blank, and if the temperature evolution curve accords with the temperature change curve, the actually detected temperature evolution curve can be represented, so that the actual temperature of the casting blank can be accurately determined according to the temperature evolution curve, that is to the actually predicted through the temperature evolution curve, so that the casting blank can be accurately predicted in real time, and the casting blank can be conveniently subjected to the subsequent operation; if the temperature evolution curve does not accord with the temperature change curve, the steps S10 to S50 are required to be re-executed, and at least one step from the steps S10 to S50 is adjusted so that the temperature evolution curve of the casting blank model is closer to the actual temperature change curve of the casting blank, and therefore the temperature of the casting blank is accurately determined according to the temperature evolution curve.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 shows a flow chart of an embodiment of a method of determining the temperature of a hot-feed billet according to the present invention;
FIG. 2 shows a specific flow chart of the method of FIG. 1 for determining the temperature of a hot-feed billet;
FIG. 3 shows a flow chart of an embodiment of a method of determining a casting blank in-furnace temperature according to the present invention;
FIG. 4 shows a specific flow chart of the method of FIG. 3 for determining the casting blank entry temperature;
FIG. 5 shows a schematic diagram of a casting model of an embodiment of the method of determining a casting entry temperature of FIG. 4; and
FIG. 6 shows a graph of temperature evolution of particles to be detected on a casting model of the method of determining a casting entry temperature of FIG. 5.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.
In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present invention.
The hot feeding and hot charging technology of the continuous casting billet can fully and effectively utilize the sensible heat of the continuous casting billet, not only can greatly reduce energy consumption and achieve the aim of greatly saving energy, but also can shorten the production period of products, remarkably improve the quality of the products, improve the metal yield, reduce the occupied area of a factory building and save investment. Therefore, the hot feeding and hot charging technology of the continuous casting billet has high economic value from the viewpoint of saving production cost and investment.
The steel pipe production process adopting the hot feeding and hot loading process comprises the following steps: steelmaking, tube blank continuous casting, tube blank hot cutting, tube blank hot feeding and hot loading, annular heating furnace heating, perforation, tube rolling, stepping furnace heating, sizing/reducing and cooling by a cooling bed.
Aiming at the problems that the temperature of each particle on the tube blank is difficult to determine due to the fact that the internal temperature of the tube blank cannot be directly measured, and the temperature of the tube blank determined by an industrial test method has the defects of large error, high cost and low efficiency, the invention and the embodiment of the invention provide a method for determining the temperature of a hot-feeding and hot-charging casting blank so as to accurately determine the temperature of the casting blank in the hot-feeding and hot-charging process.
The technical scheme of the invention can be applied to the technical field of seamless steel tube production, and particularly can be applied to a heating process of a tube blank.
In the embodiment of the present invention, the billet is a tube blank for producing a seamless steel tube.
As shown in fig. 1, in an embodiment of the present invention, a method for determining a temperature of a hot feed cast slab includes: step S10: establishing a casting blank model of a current casting blank; step S20: establishing an equipment model of equipment for conveying casting blanks; step S30: determining the corresponding relation between a casting blank model and an equipment model; step S40: a checking step, including a step of judging whether or not there is an error in the steps S10 to S30, if at least one of the steps S10 to S30 is an error, repeating the steps S10 to S30, and if none of the steps S10 to S30 is an error, executing the step S50; step S50: calculating a temperature field of the casting blank model, and determining a temperature evolution curve of the casting blank model; step S60: the judging step comprises the step of judging whether the temperature evolution curve accords with the temperature change curve of the casting blank which is actually detected, if so, determining the temperature of the casting blank according to the temperature evolution curve, and if not, repeatedly executing the steps S10 to S50.
Through the steps, a casting blank model and an equipment model of equipment for conveying casting blanks are established, the corresponding relation between the casting blank model and the equipment model is determined, through the checking step of the step S40, the temperature field of the casting blank model can be calculated under the condition of no errors from the step S10 to the step S30, namely, the step S50 is executed, the temperature field of the casting blank model can be obtained through the calculation, namely, the temperature field of the casting blank can be simulated through the execution of the step S50, then, through the judging step of the step S60, the temperature evolution curve of the casting blank model obtained through the simulation of the temperature field of the casting blank can be compared with the actually detected temperature change curve of the casting blank, and if the temperature evolution curve accords with the temperature change curve, the actually detected temperature evolution curve can be represented, so that the actual temperature of the casting blank can be accurately determined according to the temperature evolution curve, namely, the temperature of the casting blank can be accurately predicted in real time through the temperature evolution curve, so that the current casting blank can be conveniently subjected to subsequent operation; if the temperature evolution curve does not accord with the temperature change curve, the steps S10 to S50 are required to be re-executed, and at least one step from the steps S10 to S50 is adjusted so that the temperature evolution curve of the casting blank model is closer to the actual temperature change curve of the casting blank, and therefore the temperature of the casting blank is accurately determined according to the temperature evolution curve.
Further, compared with the prior art that the temperature of the casting blank is determined by the estimation method (the internal temperature of the tube blank is estimated according to the external temperature of the tube blank), the technical scheme of the application has certain scientificity and rigor, the accuracy of the temperature of the casting blank determined by the technical scheme of the application is higher, and the technical scheme of the application is not limited to the measuring position, can accurately determine the temperature of any point of the casting blank, has higher adaptability and applicability, and has the advantages of smaller error, low cost and higher efficiency.
Preferably, before step S10, the method of determining the temperature of the hot-feed cast slab further includes the step of determining the number of equipment models to be built.
It should be noted that, the steps S10 and S20 are executed in no sequence, that is, the execution sequence of the steps S10 and S20 may be selected according to the actual requirement, that is, the step S10 is executed first and then the step S20 is executed or the step S20 is executed first and then the step S10 is executed.
It should be noted that, the step of determining whether or not there is an error in the steps S10 to S30 in the step S40 needs to determine each of the steps S10 to S30, and after determining each of the steps S10 to S30, if at least one of the steps S10 to S30 is error, the steps S10 to S30 are repeatedly performed, and if each of the steps S10 to S30 is error-free, the step S50 is performed.
Of course, in alternative embodiments not shown in the drawings of the present application, the following may be set according to actual situations and actual needs: in the step of repeatedly performing the steps S10 to S30 of the above step S40, only the erroneous corresponding step may be repeatedly performed, for example, if it is judged that the step S10 is erroneous in the step of judging whether or not the step S10 is erroneous in the step of judging the step S10 to S30 of the above step S40, only the erroneous corresponding step S10 may be repeatedly performed in the step of repeatedly performing the step S10 to S30 of the above step S40, and it is not necessary to repeatedly perform the step S20 and the step S30, and of course, if both the step S10 and the step S20 are erroneous, only the erroneous step S10 and the step S20 may be repeatedly performed, and it is not necessary to repeatedly perform the step S30, and so on.
In the embodiment of the invention, the method for determining the temperature of the hot-feed hot-charging casting blank can be used for determining the temperature inside the casting blank, and the operation process can be as follows: selecting a plurality of particles to be detected on the outer surface of a casting blank, measuring the temperature value of the particles to be detected on the outer surface of an actual casting blank at a certain moment or the temperature change curve of the particles to be detected on a certain time period, simulating the temperature field of the casting blank according to the method for determining the temperature of the hot-feeding and hot-charging casting blank of the application to obtain the temperature field of the casting blank model, obtaining the temperature value of the particles to be detected corresponding to the particles to be detected on the casting blank model at the same moment or the temperature change curve of the particles to be detected in the same time period, judging whether the difference between the temperature value of the particles to be detected on the outer surface of the actual casting blank and the temperature value of the corresponding particles to be detected on the casting blank model is within a preset range or judging whether the temperature change curve of the particles to be detected on the outer surface of the actual casting blank and the temperature change curve of the corresponding particles to be detected on the casting blank model are consistent, if so, indicating that the temperature field of the casting blank model can represent the temperature field of the actual casting blank, that the temperature field of the actual casting blank can be determined, that the temperature of a certain particle to be detected inside the actual casting blank can be determined through the temperature field of the casting blank, and the temperature of the particles to be detected.
As shown in fig. 2, in the embodiment of the present invention, step S10 includes: step S11: establishing a geometric model of a casting blank; step S12: and establishing a casting blank model according to the material of the casting blank and the physicochemical parameters of the casting blank corresponding to the material.
In the above steps, the casting blank model is built according to the actual structure, material and physical and chemical parameters of the casting blank, through the above steps, the built casting blank model can be attached to the actual casting blank as much as possible, so that the casting blank model can represent the actual condition of the casting blank as much as possible, and thus, the actual temperature field of the casting blank can be simulated by calculating the temperature field of the casting blank model, and the accuracy of determining the actual temperature of the casting blank through the temperature field of the casting blank model can be improved.
Preferably, in the embodiment of the present invention, in step S11, the geometric model of the casting blank is determined according to the geometric shape and geometric dimension of the casting blank, so that the casting blank model has the same structure as the casting blank, and the casting blank model can be made to represent the actual condition of the casting blank as much as possible, which is helpful for improving the accuracy of determining the actual temperature of the casting blank through the temperature field of the casting blank model.
Preferably, in the embodiment of the present invention, the ratio of the length dimension of the cast slab to the radial dimension of the cast slab ranges from 3 to 4. The hot feeding and hot charging process is complex, the used blanks are various in materials and different in length, the length of the blanks is generally 1.8-4.5 m, and the blanks need to be contacted with a roller way and a rack in the transportation process. The embodiment of the invention provides a simplified processing method based on a large number of calculation results, which comprises the following steps: for example, the length dimension of the casting blank is set to be 1.2m, the radial dimension of the casting blank is determined according to the fact that the length dimension of the casting blank is 3 to 4 times of the radial dimension of the casting blank, calculation is carried out according to the length dimension of the casting blank, and the result shows that a longer section of the temperature evolution curve of the core axis of the casting blank model is basically overlapped with the temperature change curve of the actual core axis of the casting blank, that is, the length of the casting blank is enough, so that actual measurement is not needed on site, and the calculation amount can be reduced.
Preferably, in an embodiment of the present invention, after step S11 and before step S40, the method for determining a temperature of a hot-feed cast slab further includes a step of gridding the cast slab model to obtain a gridded cast slab model. By the arrangement, the subsequent calculation of the temperature field of the casting blank model can be facilitated, the accuracy of the calculation of the temperature field of the casting blank model can be improved, and the accuracy of determining the actual temperature of the casting blank through the temperature field of the casting blank model can be improved.
Preferably, in the embodiment of the present invention, in step S12, the physicochemical parameters of the cast slab include strength, poisson' S ratio, thermal expansion coefficient, heat capacity, stress-strain curve, heat transfer coefficient of the cast slab, emissivity of the cast slab, and the like. In order to enable the casting blank model to be attached to an actual casting blank as much as possible, the more physical and chemical parameters of the used casting blank are, the more the casting blank model can represent the actual condition of the casting blank, and the accuracy of determining the actual temperature of the casting blank through the temperature field of the casting blank model is improved. In order to reduce a large amount of laboratory work, the embodiment of the invention calculates the performance of the low alloy material by using the JMatpro software, further obtains the strength, the Poisson ratio, the thermal expansion coefficient, the heat capacity, the stress strain curve, the CCT/TTT curve and the like of the corresponding material, and inputs the calculation results into a database of the simulation software, thereby facilitating the subsequent step call. Of course, in alternative embodiments of the present application, the physicochemical parameters of the casting blank may also be obtained by querying the physicochemical parameters of the casting blank in the handbook of alloy steels, etc.
Of course, in alternative embodiments of the present application, it may be further configured as needed: in step S12, the physicochemical parameters of the casting blank include one or more of strength, poisson' S ratio, thermal expansion coefficient, heat capacity, stress-strain curve, heat transfer coefficient of the casting blank, and emissivity of the casting blank, although other physicochemical parameters of some casting blanks not mentioned herein may be added in alternative embodiments of the present application. The physical and chemical parameters of the casting blank are all within the protection scope of the application.
As shown in fig. 2, in the embodiment of the present invention, step S20 includes: step S21: establishing a geometric model of equipment for conveying casting blanks; step S22: and establishing an equipment model according to the material of the equipment and the physical and chemical parameters of the equipment corresponding to the material.
In the above steps, the equipment model is built according to the structure, the material and the physical and chemical parameters of the equipment for conveying the casting blank, through the above steps, the built equipment model can be attached to the actual equipment for conveying the casting blank as much as possible, so that the equipment model can represent the actual condition of the equipment for conveying the casting blank as much as possible, the influence of the equipment model on the casting blank model can accurately reflect the influence of the equipment for conveying the casting blank on the casting blank, through the above arrangement, the actual temperature field of the casting blank can be accurately simulated by calculating the temperature field of the casting blank model, and the accuracy of determining the actual temperature of the casting blank through the temperature field of the casting blank model can be improved.
Preferably, in the embodiment of the present invention, in step S21, the geometric model of the apparatus for delivering the cast slab is determined according to the geometric shape and the geometric size of the apparatus. The device model has the same structure as the device for conveying the casting blank, and can represent the actual condition of the device for conveying the casting blank as far as possible, so that the influence of the device for conveying the casting blank on the casting blank can be accurately reflected through the influence of the device model on the casting blank model, and the accuracy of determining the actual temperature of the casting blank through the temperature field of the casting blank model is improved.
Preferably, in the embodiment of the present invention, in step S22, the physicochemical parameters of the apparatus for transporting the cast slab include a heat transfer coefficient of the above apparatus and a emissivity of the above apparatus. In order to make the equipment model be attached to the actual casting blank conveying equipment as much as possible, the more physical and chemical parameters of the equipment are used, so that the more the equipment model can represent the actual condition of the casting blank conveying equipment, the higher the accuracy of the influence of the equipment model on the casting blank model is reflected, and the accuracy of determining the actual temperature of the casting blank through the temperature field of the casting blank model is improved.
Of course, in alternative embodiments of the present application, the physicochemical parameters of the device for delivering the casting blank may also be made to include only the heat transfer coefficient of the above-mentioned device or only the emissivity of the above-mentioned device, according to the actual needs. Of course, in alternative embodiments of the present application, other physicochemical parameters of some of the devices for delivering the casting blank not mentioned herein may be added. The physicochemical parameters of the device for transporting the casting blank are all within the scope of protection of the present application.
The tube blank transportation process is a process of changing the spatial position of the tube blank, the tube blank is contacted with a roller way, a rack and the like, the position is continuously changed, and the heat is continuously exchanged. In the embodiment of the invention, the transportation process of the casting blank is simplified to be processed into the casting blank model which stands on the equipment model of the equipment for conveying the casting blank, and no relative motion occurs between the casting blank model and the equipment model of the equipment for conveying the casting blank; the heat transfer coefficient and the friction coefficient between the equipment model and the casting blank model are set to be a certain value (in the embodiment of the invention, the heat transfer coefficient is 0 to 0.01, and the friction coefficient is 0 to 0.001), the shape of the equipment model is not required to be identical with that of the actual equipment for conveying the casting blank, so that the work of accurate drawing, dynamic parameter input and the like required before calculation is simplified, and the labor time and the calculation time can be saved.
Preferably, the device for conveying the casting blank can be a roller table or a rack.
As shown in fig. 2, in the embodiment of the present invention, step S30 includes: step S31: determining the relative position between the casting blank model and the equipment model; step S32: and determining the heat transfer coefficient and the friction coefficient between the casting blank model and the equipment model.
In the above steps, the relative position between the casting blank model and the equipment model is determined according to the position relation between the casting blank and the equipment for conveying the casting blank, the heat transfer coefficient and the friction coefficient between the casting blank model and the equipment model are determined according to the heat transfer coefficient and the friction coefficient between the casting blank and the equipment for conveying the casting blank, the heat transfer condition between the casting blank model and the equipment model can be determined according to the determined relative position, the determined heat transfer coefficient and the determined friction coefficient between the casting blank model and the determined friction coefficient, the subsequent calculation of the temperature field of the casting blank model can be more accurate, and therefore the accuracy of determining the actual temperature of the casting blank according to the temperature field of the casting blank model can be improved.
The more the physical and chemical parameters between the utilized casting blank and the equipment for conveying the casting blank are, the more the actual conditions between the casting blank and the equipment for conveying the casting blank can be reflected through the casting blank model and the equipment model, so that the more accurate the subsequent calculation of the temperature field of the casting blank model is. Of course, in an alternative embodiment not shown in the drawings of the present application, step S32 may also be performed to determine the heat transfer coefficient or friction coefficient between the casting blank model and the equipment model according to actual needs. Of course, in alternative embodiments of the present application, other physicochemical parameters between some of the casting blanks not mentioned herein and the device for transporting the casting blanks may be added. The physicochemical parameters between the cast strand and the equipment for transporting the cast strand are all within the scope of protection of the present application.
Preferably, in the embodiment of the present invention, the step of determining whether the parameters in the steps S10 to S30 are correct in the step S40 includes the step of determining whether the parameters in the steps S10 to S30 are correct. Specifically, whether each parameter in each step S10, step S20 and step S30 is accurate is determined, if the parameters required for establishing the casting blank model in step S10 are accurate, the parameters required for establishing the equipment model in step S20 are accurate, and the parameters required for determining the correspondence between the casting blank model and the equipment model in step S30 are accurate, step S50 is performed; if the parameter in any one of the above steps S10, S20 and S30 is inaccurate, the parameter is corrected and the step of inaccurate parameter is repeatedly performed. By accurately judging and checking the parameters in the steps S10 to S30, the parameters in the steps S10 to S30 can be adjusted in time, and the step S50 is ensured to be executed under the condition that the steps S10 to S30 are all correct, so that the temperature field of the casting blank model is accurately calculated, and the accuracy of determining the actual temperature of the casting blank through the temperature field of the casting blank model is improved.
As shown in fig. 2, in the embodiment of the present invention, step S50 includes: step S51: determining particles to be detected on a casting blank model; step S52: determining the initial temperature of a casting blank model; step S53: determining an initial temperature of the device model; step S54: and calculating a temperature field of the casting blank model by a finite element method, and obtaining a temperature evolution curve of particles to be detected on the casting blank model.
Initial conditions of the casting blank model and the equipment model can be set through the step S51, the step S52 and the step S53, and after initial conditions of the casting blank model and the equipment model and particles to be detected of the casting blank model are determined, the temperature field of the casting blank model can be calculated; the temperature field of the casting blank model is calculated by the finite element method, so that the temperature field of the casting blank can be simulated more simply and accurately, the temperature field of the casting blank is reflected truly, and the corresponding temperature evolution curve of particles to be detected is acquired accurately, thereby facilitating subsequent operation.
It should be noted that, the steps S51, S52, and S53 are not sequentially executed, that is, the execution sequence of the steps S51, S52, and S53 may be selected according to actual needs, for example, the steps S51, S52, and S53 may be sequentially executed, the steps S53, S51, and S52 may be sequentially executed, and so on.
Preferably, in the embodiment of the present invention, in step S52, the solidification point at which the casting mold is changed from the liquid phase to the solid phase, which corresponds to the material of the casting mold, is used as the initial temperature of the casting mold. In the actual production process, compared with the solidifying point of the casting blank, the moment of the liquid-to-solid phase transition of the casting blank is easier to determine, the solidifying point of the casting blank is taken as the initial temperature, and the time for controlling the production of the casting blank can be conveniently and accurately determined, so that the time for conveying the casting blank (namely the time for cooling the casting blank) can be accurately determined, and the temperature of the casting blank in a certain cooling time can be accurately acquired. Preferably, in the embodiment of the present invention, the maximum temperature at which the tube blank starts to be cooled may be designed to 1400 ℃, CCT (continuous cooling curve) may be calculated according to the material composition by the finite element method, and the starting temperature of the liquid-to-solid phase transition may be determined as the starting temperature of the tube blank cooling (i.e., the initial temperature of the cast slab model in the embodiment of the present invention).
Preferably, in the embodiment of the present invention, before step S60, the method for determining the temperature of the hot-feed hot-fill casting blank further includes a step of determining a temperature variation curve of particles to be detected on the casting blank that is actually detected. The positions of the particles to be detected on the casting blank are the same as the positions of the particles to be detected on the casting blank model, so that when the temperature evolution curve is consistent with the temperature change curve, the temperature of the particles to be detected on the casting blank can be determined through the temperature evolution curve of the particles to be detected on the casting blank model.
Preferably, in the embodiment of the present invention, in step S60, the step of determining whether the temperature evolution curve matches the temperature change curve of the actually detected casting blank includes the step of determining whether the difference between the temperature of the particles to be detected on the casting blank model and the temperature of the particles to be detected on the actually detected casting blank is within a preset range when the cooling time of the casting blank model and the casting blank is the same. After the casting blank model and the casting blank pass through the same cooling time, if the difference value between the temperature of the particles to be detected on the casting blank model and the temperature of the particles to be detected on the casting blank which are actually detected is within a preset range, the temperature of the particles to be detected on the casting blank model can be accurately represented, that is, the temperature field of the casting blank model can be accurately represented, the temperature evolution curve of the particles to be detected on the casting blank model is consistent with the temperature change curve of the particles to be detected on the casting blank which are actually detected, and the temperature of the particles to be detected on the casting blank can be accurately determined through the temperature evolution curve of the particles to be detected on the casting blank model.
Preferably, the above-mentioned preset range is ±5 ℃.
The temperature at which the hot-charged tube blank enters the annular heating furnace has an important influence on whether the surface of the finished steel tube has cracks, whether the crystal grains are coarse and whether the finished steel tube has abnormal structures. Theoretical studies have shown that the maximum temperature of each particle on the tube blank should be less than A (A is typically about 727 ℃ + -5 ℃). However, since the temperature inside the tube blank cannot be directly measured, it becomes difficult to determine the furnace feeding temperature of the tube blank so that the tube blank enters the annular heating furnace within a proper temperature range (for example, below a), thereby achieving the purpose of ensuring good energy-saving effect and ensuring higher quality of the finished steel tube. Aiming at the problem how to determine the furnace inlet temperature of the tube blank, the invention and the embodiment of the invention provide a method for determining the furnace inlet temperature of a casting blank, which can ensure that the casting blank enters an annular heating furnace within a proper temperature range (such as below A), thereby achieving the purposes of ensuring good energy-saving effect and ensuring higher quality of finished steel tubes.
As shown in fig. 3 and 4, in an embodiment of the present invention, a method for determining a casting blank charging temperature includes: step S70: determining the current temperature value of a casting blank; step S80: judging whether the current temperature value of the casting blank is smaller than or equal to a preset value, if so, executing the step of enabling the casting blank to enter a heating furnace, and if not, executing the step of cooling the casting blank; in step S70, the current temperature value of the casting blank is determined according to the method for determining the temperature of the hot-feed hot-charge casting blank.
In the above steps, whether the casting blank can enter the heating furnace is determined according to whether the current temperature value of the casting blank is smaller than or equal to a preset value, when the current temperature value of the casting blank is smaller than or equal to the preset value, the casting blank can enter the heating furnace, the step of enabling the casting blank to enter the heating furnace can be executed, if the current temperature value of the casting blank is larger than the preset value, the casting blank needs to be cooled first, and the temperature value of the casting blank is smaller than or equal to the preset value, and only when the casting blank can enter the heating furnace; therefore, the purposes of ensuring the energy-saving effect and ensuring the high quality of the finished steel pipe can be achieved.
Preferably, the preset value may be a, where a is generally in a range of 727±5 ℃, and a of a casting blank is determined according to a material of the casting blank, and may be calculated by JMatpro software according to the material of the casting blank.
It should be noted that, since the current temperature value of the casting blank in the method for determining the casting blank feeding temperature of the present application is determined according to the method for determining the hot-feed casting blank temperature of the present application, the method for determining the casting blank feeding temperature of the present application also has the above advantages of the method for determining the hot-feed casting blank temperature of the present application, and will not be described herein.
The invention and the embodiment of the invention also provide a storage medium, wherein the storage medium stores a program, and the program is executed to execute the method for determining the casting blank charging temperature. The storage medium stores a program that, when executed, performs the above-described method of determining the casting blank charging temperature.
The invention and the embodiment of the invention also provide a processor which is used for running a program, wherein the program is run to execute the method for determining the casting blank furnace inlet temperature. And executing a program by a processor, and executing the method for determining the casting blank furnace inlet temperature when the program is executed.
The method for accurately determining the temperature of the hot-feeding hot-charging casting blank is provided by combining production practice, and a large amount of calculation is performed on the cooling process of the pipe blank, so that the temperature of the common steel-grade pipe blank entering the annular heating furnace can be rapidly and accurately determined, and whether the pipe blank can enter the annular heating furnace can be determined.
The method for determining the temperature of the hot-feeding hot-charging casting blank can rapidly and accurately determine the temperature of the tube blanks with different outer diameters, lengths and steel types entering the annular heating furnace, so as to determine whether the tube blanks can enter the annular heating furnace. The method adopts a finite element method and combines the JMatpro software (the JMatpro software is a material performance simulation software) and the simufact.forming software (the simufact.forming software is a material processing and heat treatment process simulation optimization software) to calculate the temperature field of the casting blank model, and the design thinking of the method is as follows: when the temperature of each particle to be detected on the outer surface of the tube blank is consistent with the temperature of the corresponding particle to be detected on the calculated casting blank model at each time point or the difference value between the temperature of each particle to be detected and the temperature of the corresponding particle to be detected on the calculated casting blank model is within a certain preset range, the temperature of each particle to be detected in the tube blank at different time points can be deduced to be within a certain preset range, so that the temperature of the hot-feeding and hot-charging casting blank can be determined.
According to the embodiment of the invention, according to the operation habit of an operator in the actual operation process, the center of the end face of the tube blank is used as a site manual temperature measurement point for the convenience of measurement, so that the problem of large deviation of the measured temperature can be avoided, and the accuracy is improved.
The embodiment of the invention utilizes simulation software to simulate and calculate the temperature field of the casting blank model so as to determine the temperature of the hot-feed hot-charged casting blank (of course, in alternative embodiments of the application, the temperature field of the casting blank model can be simulated and calculated by other finite element methods). The method for determining the temperature of the hot-feed hot-charging cast blank and determining the temperature of the entering furnace of the cast blank according to the embodiment of the invention will be described below by taking the cooling process of a tube blank with a radial dimension of phi 330mm and a material of 14MnNb as an example:
1. setting the number of equipment models to be built to be 1;
2. and establishing a device for conveying the casting blank and a geometric model of the casting blank, wherein the geometric model comprises geometric shapes and geometric dimensions. In the embodiment of the invention, the tube blank is a cylinder with the length of 1200mm and the diameter of 330 mm. Taking hexahedron with the thickness of 20mm and the length and width of 200mm as equipment for conveying casting blanks;
3. determining the material of equipment as H13 (Cr 13 and the like can be used as the material of equipment for conveying casting blanks in alternative embodiments of the invention), and establishing an equipment model; determining the material of the tube blank as 14MnNb, and establishing a casting blank model according to the strength, poisson's ratio, thermal expansion coefficient, heat capacity, stress-strain curve and the like of the material corresponding to the material of the tube blank;
4. Determining the spatial positions of the equipment model and the casting blank model, for example, the equipment model can be positioned below the casting blank model to support the casting blank model;
5. determining a plurality of particles to be detected (shown in fig. 5, wherein 1, 2, 3, 4 and 5 are five particles to be detected on the axis of the tube blank in the embodiment of the invention) on the axis, the surface or other positions where the temperature needs to be determined, so as to track the actual temperature change curve of the particles to be detected on the casting blank after the calculation of the temperature field of the casting blank model is completed;
6. the heat transfer coefficient of the casting blank model and the air is set to be 50W/m < 2 >. K, the heat radiation amount of the casting blank model to the environment is medium (in the embodiment of the invention, the radiation rate is 0.2 to 0.8), and the initial temperature of the casting blank model is 1400 ℃;
7. setting the initial temperature of the equipment model to 20 ℃, the heat transfer coefficient of the equipment model and air to be 50W/m < 2 >. K, the heat radiation amount of the equipment model to the environment to be medium (the radiation rate is 0.2 to 0.8 in the embodiment of the invention), and the heat transfer coefficient between the equipment model and the casting blank model to be 0 (the heat transfer coefficient is 0 to 0.01 in the embodiment of the invention);
8. the friction coefficient of the equipment model and the casting blank model is substantially negligible, and is set to 0.001 (in the embodiment of the present invention, the friction coefficient is 0 to 0.001);
9. Gridding the casting blank model to obtain a gridded casting blank model;
10. and checking and storing the established casting blank model and the established equipment model. If the casting blank model and/or the equipment model are wrong, the casting blank model and/or the equipment model need to be re-established;
11. calculating a temperature field of the casting blank model according to a finite element method;
12. and checking calculation results, such as checking temperature evolution curves of particles to be detected on the casting blank model. And comparing whether the actual temperature value of the to-be-detected particle on the outer surface of the tube blank is consistent with the calculated temperature value of the to-be-detected particle on the casting blank model or whether the difference value between the actual temperature value and the calculated temperature value of the to-be-detected particle is within a preset range, judging whether the set parameters in the simulation process are suitable or not, and revising the parameters if the set parameters are suitable, and carrying out simulation again. If the result is ideal (for example, the calculated temperature value of the to-be-detected particle on the casting blank model is consistent with the actual temperature value of the to-be-detected particle on the outer surface of the pipe blank or the difference value between the calculated temperature value of the to-be-detected particle and the actual temperature value of the to-be-detected particle is within a preset range), the temperature of the to-be-detected particle on the pipe blank can be determined according to the temperature evolution curve of the to-be-detected particle on the casting blank model, and the actual temperature field of the pipe blank can be determined according to the calculated temperature field of the casting blank model so as to facilitate the subsequent production of the steel pipe.
In the embodiment of the invention, according to the related calculation, when the A of the tube blank made of 14MnNb (shown in fig. 5) is about 730 ℃, and the tube blank cooling time is about 3600 seconds, the temperature of the central tube end of the tube blank is about 550 ℃ when the highest temperature of the tube blank is 730 ℃, the temperature of the central tube end of the tube blank is 180 ℃ lower than the highest temperature of the tube blank, the result is consistent with the field measurement, and the temperature of other particles on the surface of the tube blank is consistent with the calculation result, so that the calculation result can be determined reliably and accurately, and the highest temperature in the tube blank can be deduced to be consistent with the calculation, so that the temperature of the central tube end of the tube blank, namely 550 ℃, can be used as the temperature of a control point for controlling the furnace feeding temperature of the tube blank.
It should be noted that, in the embodiment of the present invention, the operation sequence from the 3 rd to the 9 th in the above operation process may be adjusted according to actual needs, that is, the operation sequence from the 3 rd to the 9 th is not sequential. In order to track more particles to be detected, the spatial positions of the particles to be detected can be reset, calculated again and compared with practice.
According to the embodiment of the invention, according to the habit of staff measuring the temperature of the tube blank in the actual operation process, the convenience, feasibility and safety of measurement are considered, the center of the end surface of the tube blank is used as a site manual measurement point, and when the center of the end surface of the tube blank is lower than the temperature of a certain control point, the tube blank can enter the annular heating furnace for heating.
The method for determining the temperature of the hot-feeding hot-charging casting blank and the method for determining the temperature of the casting blank in the technical scheme of the application are scientific and simplified treatment methods suitable for determining the temperature of the tube blank in the tube blank cooling process. The technical scheme of the application can be applied to the technical field of low alloy steel production. The technical scheme of the application can be suitable for determining the temperature of the tube blank with any diameter within the range of phi 280mm to phi 330mm in the cooling process.
The technical scheme of the application has the following advantages: 1. the calculation cost is low, the verified calculation result is used for guiding the actual production, the deviation problem caused by manual judgment can be avoided, and the determined temperature is accurate and reliable; 2. compared with the industrial experiment with long time consumption and high cost, the technical scheme of the method has the advantages of short time consumption and low cost, greatly reduces labor cost and quality cost possibly generated during production, and remarkably improves efficiency; 3. the technical scheme of the method adopts beneficial simplification, is beneficial to quick calculation to obtain a result, generally requires only tens of minutes for calculation, more than hundred types of steel are used for producing the steel pipe, and the outer diameters of pipe blanks for the same unit are also various; the tube blank temperature change curves of different components and different blank diameters are different, if each variable change is verified by an industrial production experiment, the efficiency is low, and the result can be obtained by rapid calculation through the technical scheme of the application, so that the production efficiency is remarkably improved; 4. according to the technical scheme, according to the calculated result, personnel operation habit and the angle of convenient operation, the on-site actual temperature measuring point is defined as the center of the end face of the tube blank, so that the randomness of the measuring point is avoided, and the reproducibility of the result is improved.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: through the steps, a casting blank model and an equipment model of equipment for conveying casting blanks are established, the corresponding relation between the casting blank model and the equipment model is determined, through the checking step of the step S40, the temperature field of the casting blank model can be calculated under the condition of no errors from the step S10 to the step S30, namely, the step S50 is executed, the temperature field of the casting blank model can be obtained through the calculation, namely, the temperature field of the casting blank can be simulated through the execution of the step S50, then, through the judging step of the step S60, the temperature evolution curve of the casting blank model obtained through the simulation of the temperature field of the casting blank can be compared with the actually detected temperature change curve of the casting blank, and if the temperature evolution curve accords with the temperature change curve, the actually detected temperature evolution curve can be represented, so that the actual temperature of the casting blank can be accurately determined according to the temperature evolution curve, namely, the temperature of the casting blank can be accurately obtained in real time through the temperature evolution curve, so that the casting blank can be conveniently subjected to subsequent operation; if the temperature evolution curve does not match the temperature change curve, the steps S10 to S50 need to be re-executed, and at least one of the steps S10 to S50 is adjusted to match the temperature evolution curve with the temperature change curve, so that the temperature of the casting blank is accurately determined according to the temperature evolution curve. Further, compared with the prior art that the temperature of the casting blank is determined by the estimation method (the internal temperature of the tube blank is estimated according to the external temperature of the tube blank), the technical scheme of the application has certain scientificity and rigor, the accuracy of the temperature of the casting blank determined by the technical scheme of the application is higher, and the technical scheme of the application is not limited to the measuring position, can accurately determine the temperature of any point of the casting blank, has higher adaptability and applicability, and has the advantages of smaller error, low cost and higher efficiency.
It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A method of determining the temperature of a hot-feed hot-charged billet, comprising:
step S10: establishing a casting blank model of a current casting blank;
step S20: establishing an equipment model of equipment for conveying the casting blank;
step S30: determining a corresponding relation between the casting blank model and the equipment model;
step S40: a checking step including a step of judging whether or not there is an error in the steps S10 to S30, and if at least one of the steps S10 to S30 is error, repeating the steps S10 to S30, and if none of the steps S10 to S30 is error, executing the step S50;
step S50: calculating a temperature field of the casting blank model, and determining a temperature evolution curve of the casting blank model;
step S60: and judging, namely judging whether the temperature evolution curve accords with the actually detected temperature change curve of the casting blank, if so, determining the temperature of the casting blank according to the temperature evolution curve, and if not, repeatedly executing the steps S10 to S50.
2. The method for determining the temperature of a hot-feed cast slab according to claim 1, wherein the step S10 includes:
step S11: establishing a current geometric model of the casting blank;
step S12: and establishing the casting blank model according to the material of the casting blank and the physicochemical parameters of the casting blank corresponding to the material.
3. The method for determining the temperature of a hot-feed cast slab according to claim 2, wherein,
in the step S11, determining a geometric model of the casting blank according to the geometric shape and the geometric dimension of the casting blank, wherein the ratio of the length dimension of the casting blank to the radial dimension of the casting blank ranges from 3 to 4; or,
in the step S12, the physicochemical parameters of the casting blank include at least one of strength, poisson' S ratio, thermal expansion coefficient, heat capacity, stress-strain curve, heat transfer coefficient of the casting blank, and emissivity of the casting blank; or,
in the step S11, determining a geometric model of the casting blank according to the geometric shape and the geometric dimension of the casting blank, wherein the ratio of the length dimension of the casting blank to the radial dimension of the casting blank ranges from 3 to 4; in the step S12, the physicochemical parameter of the cast slab includes at least one of strength, poisson' S ratio, thermal expansion coefficient, heat capacity, stress-strain curve, heat transfer coefficient of the cast slab, and emissivity of the cast slab.
4. The method of determining the temperature of a hot-feed cast slab according to claim 1, wherein the step S20 includes:
step S21: establishing a geometric model of the device for transporting the casting blank;
step S22: and establishing the equipment model according to the material of the equipment and the physicochemical parameters of the equipment corresponding to the material.
5. The method for determining the temperature of a hot-feed cast slab according to claim 4, wherein,
in the step S21, determining a geometric model of the device according to the geometric shape and the geometric size of the device; or,
in the step S22, the physicochemical parameter of the device includes at least one of a heat transfer coefficient of the device and an emissivity of the device; or,
in the step S21, determining a geometric model of the device according to the geometric shape and the geometric size of the device; in the step S22, the physicochemical parameter of the device includes at least one of a heat transfer coefficient of the device and an emissivity of the device.
6. The method of determining the temperature of a hot-feed cast slab according to claim 1, wherein the step S30 includes:
Step S31: determining a relative position between the casting blank model and the equipment model;
step S32: at least one of a heat transfer coefficient and a friction coefficient between the casting model and the equipment model is determined.
7. The method for determining the temperature of a hot-feed cast slab according to claim 2, wherein,
after the step S11 and before the step S40, the method for determining a temperature of a hot-feed hot-charged casting blank further includes a step of performing gridding treatment on the casting blank model to obtain a gridded casting blank model; or,
the step of determining whether the parameters in the steps S10 to S30 are correct in the step S40 includes a step of determining whether the parameters in the steps S10 to S30 are correct.
8. The method of determining the temperature of a hot-feed cast slab according to claim 1, wherein the step S50 includes:
step S51: determining particles to be detected on the casting blank model;
step S52: determining the initial temperature of the casting blank model;
step S53: determining an initial temperature of the device model;
step S54: and calculating a temperature field of the casting blank model by a finite element method, and obtaining a temperature evolution curve of the particles to be detected on the casting blank model.
9. The method according to claim 8, wherein in the step S52, a solidification point of the casting mold corresponding to a material of the casting mold, which is changed from a liquid phase to a solid phase, is set as an initial temperature of the casting mold.
10. The method for determining the temperature of a hot-feed cast slab according to claim 1, wherein,
before the step S60, the method for determining the temperature of the hot-feed hot-fill casting blank further includes a step of determining a temperature change curve of to-be-detected particles on the casting blank that is actually detected; or,
in the step S60, the step of determining whether the temperature evolution curve matches with the temperature change curve of the actually detected casting blank includes a step of determining whether a difference between the temperature of the particles to be detected on the casting blank model and the temperature of the particles to be detected on the actually detected casting blank is within a preset range when the cooling time of the casting blank model and the cooling time of the casting blank are the same.
11. A method of determining the temperature of an ingot being charged, comprising:
step S70: determining the current temperature value of a casting blank;
step S80: judging whether the current temperature value of the casting blank is smaller than or equal to a preset value, if so, executing the step of enabling the casting blank to enter a heating furnace, and if not, executing the step of cooling the casting blank;
Wherein in said step S70, the current temperature value of said cast slab is determined according to the method for determining the temperature of hot-feed hot-runner cast slab according to any one of claims 1 to 10.
12. A storage medium storing a program, wherein the program when executed performs the method of determining a casting blank charging temperature according to claim 11.
13. A processor for running a program, wherein the program when run performs the method of determining a casting blank in-furnace temperature of claim 11.
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