Continuous casting withdrawal and straightening machine arrangement method and device

Abstract

The invention provides a continuous casting withdrawal and straightening machine arrangement method and device, and the method comprises the steps: obtaining environment information corresponding to a target continuous casting machine and the number of to-be-arranged withdrawal and straightening machines, the environment information comprises an initial casting blank center solid fraction, a first pulling speed condition corresponding to the initial casting blank center solid fraction, an end casting blank center solid fraction and a second pulling speed condition corresponding to the end casting blank center solid fraction; the environment information and a preset casting blank solidification heat transfer model are applied to determine the starting position of the to-be-arranged withdrawal and straightening machine and the ending position of the to-be-arranged withdrawal and straightening machine; and according to the starting positions of the to-be-arranged withdrawal and straightening machines, the ending positions of the to-be-arranged withdrawal and straightening machines, a preset ratio and the number of the to-be-arranged withdrawal and straightening machines, the arrangement positions of the to-be-arranged withdrawal and straightening machines in the target continuous casting machine are determined, and arrangement of the to-be-arranged withdrawal and straightening machines is completed. The reliability of the arrangement position of the withdrawal and straightening machine can be improved, and then the pressing effect of a casting blank is improved.

Description

Technical Field

[0001] The present application relates to the technical field of metallurgical continuous casting, and in particular to a method and device for arranging a continuous casting straightening machine. Background Art

[0002] Pressing down the square billet is a conventional technical means of the square billet continuous casting machine. By applying a pressing force near the solidification end of the billet, a certain amount of pressing is generated to compensate for the solidification shrinkage of the billet, so that the solidification structure of the billet is more uniform and dense, and the purpose of improving the looseness, shrinkage and center segregation of the billet is achieved. With the development of the solidification end pressing technology from static control to dynamic control, the solidification end point can be tracked during the casting process and the degree of roll gap contraction can be adjusted online as the position of the solidification end point changes. However, even with dynamic pressing control, the position of the straightening machine is still very important for the billet pressing effect.

[0003] At present, the straightening machines of most billet continuous casting machines are arranged at equal intervals, but the solidification of the billet is accelerated at the end of solidification, and the effective reduction range is limited. If the straightening machines are arranged at equal intervals, more straightening rollers cannot be used in the effective reduction range to maximize the reduction potential of the continuous casting machine. In addition, for the straightening machines arranged at equal intervals, if the spacing of the reduction rollers is too small, the installation space of the straightening machine is insufficient, and the spacing of the reduction rollers is too large, the number of effective reduction rollers is reduced, which directly affects the reduction effect of the billet. Summary of the invention

[0004] In response to at least one problem in the prior art, the present application proposes a method and device for arranging a continuous casting straightening machine, which can improve the reliability of the arrangement position of the straightening machine and further improve the pressing effect of the cast billet.

[0005] In order to solve the above technical problems, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a method for arranging a continuous casting straightening machine, comprising:

[0007] Obtaining environmental information corresponding to the target continuous casting machine and the number of straightening machines to be arranged, the environmental information including: a starting billet center solid phase ratio, a first pulling speed condition corresponding to the starting billet center solid phase ratio, an ending billet center solid phase ratio, and a second pulling speed condition corresponding to the ending billet center solid phase ratio;

[0008] Applying the environmental information and a preset solidification heat transfer model of the ingot, determining the starting position of the drawing and straightening machine to be arranged and the ending position of the drawing and straightening machine to be arranged;

[0009] According to the starting position, the ending position, the preset ratio and the number of the drawing and straightening machines to be arranged, the arrangement position of each of the drawing and straightening machines to be arranged in the target continuous casting machine is determined, and the arrangement of each of the drawing and straightening machines to be arranged is completed.

[0010] In one embodiment, the continuous casting straightening machine arrangement method further includes:

[0011] Acquiring the layout information of the target continuous casting machine under multiple casting speed conditions, wherein the layout information under each casting speed condition includes: the center temperature and the center solid phase ratio of the casting billet at multiple positions;

[0012] The layout information under each pulling speed condition is used to perform numerical simulation calculations on the ingot solidification heat transfer equation to obtain a sub-ingot solidification heat transfer model corresponding to the pulling speed condition. The boundary conditions of the ingot solidification heat transfer equation include: crystallizer thermal boundary conditions, secondary cooling zone boundary conditions and air cooling zone boundary conditions; the preset ingot solidification heat transfer model includes: sub-ingot solidification heat transfer models corresponding to each of the various pulling speed conditions.

[0013] In one embodiment, the application of the environmental information and a preset solidification heat transfer model of the ingot to determine the starting position of the to-be-arranged straightening machine and the ending position of the to-be-arranged straightening machine includes:

[0014] The starting position of the drawing and straightening machine to be arranged is determined by applying the sub-slab solidification heat transfer model corresponding to the first drawing speed condition and the solid phase ratio at the center of the starting billet; the ending position of the drawing and straightening machine to be arranged is determined by applying the sub-slab solidification heat transfer model corresponding to the second drawing speed condition and the solid phase ratio at the center of the ending billet.

[0015] In one embodiment, the method of applying the sub-cast billet solidification heat transfer model corresponding to the first pulling speed condition and the center solid phase ratio of the starting billet to determine the starting position of the drawing and straightening machine to be arranged; applying the sub-cast billet solidification heat transfer model corresponding to the second pulling speed condition and the center solid phase ratio of the ending billet to determine the ending position of the drawing and straightening machine to be arranged includes:

[0016] Inputting the solid phase ratio of the starting ingot center into the sub-ingot solidification heat transfer model corresponding to the first pulling speed condition, and determining the distance from the meniscus output by the sub-ingot solidification heat transfer model as the starting position of the drawing and straightening machine to be arranged;

[0017] The ending ingot center solid phase ratio is input into the sub-ingot solidification heat transfer model corresponding to the second pulling speed condition, and the distance from the meniscus output by the sub-ingot solidification heat transfer model is determined as the ending position of the drawing and straightening machine to be arranged.

[0018] In one embodiment, the step of determining the arrangement position of each of the to-be-arranged straightening machines in the target continuous casting machine according to the starting position, the ending position, the preset ratio and the number of the to-be-arranged straightening machines comprises:

[0019] The layout position L of the i-th straightening machine to be arranged in the target continuous casting machine is determined according to the following formula i :

[0020]

[0021]

[0022] Where N represents the number of tension and leveling machines to be arranged, L N Indicates the end position, L1 indicates the starting position, k indicates the preset ratio, M indicates the spacing between the tension and straightening machines, and 1≤i≤N.

[0023] In a second aspect, the present application provides a continuous casting straightening machine arrangement device, comprising:

[0024] The first acquisition module is used to acquire the environmental information corresponding to the target continuous casting machine and the number of the drawing and straightening machines to be arranged, wherein the environmental information includes: the starting center solid phase ratio of the ingot, the first drawing speed condition corresponding to the starting center solid phase ratio of the ingot, the ending center solid phase ratio of the ingot, and the second drawing speed condition corresponding to the ending center solid phase ratio of the ingot;

[0025] A position determination module, used to apply the environmental information and a preset solidification heat transfer model of the ingot to determine the starting position of the drawing and straightening machine to be arranged and the ending position of the drawing and straightening machine to be arranged;

[0026] The arrangement module is used to determine the arrangement position of each of the to-be-arranged straightening machines in the target continuous casting machine according to the starting position, the ending position, the preset ratio and the number of the to-be-arranged straightening machines, and complete the arrangement of each of the to-be-arranged straightening machines.

[0027] In one embodiment, the continuous casting straightening machine arrangement device further includes:

[0028] A second acquisition module is used to acquire the layout information of the target continuous casting machine under multiple casting speed conditions, wherein the layout information under each casting speed condition includes: the center temperature and center solid phase ratio of the casting billet at multiple positions;

[0029] A parameter value determination module is used to apply the layout information under each pulling speed condition to perform numerical simulation calculations on the ingot solidification heat transfer equation to obtain a sub-ingot solidification heat transfer model corresponding to the pulling speed condition, wherein the boundary conditions of the ingot solidification heat transfer equation include: a crystallizer thermal boundary condition, a secondary cooling zone boundary condition, and an air cooling zone boundary condition; and the preset ingot solidification heat transfer model includes: sub-ingot solidification heat transfer models corresponding to each of the pulling speed conditions.

[0030] In one embodiment, the location determination module includes:

[0031] A determination unit is used to apply the sub-slab solidification heat transfer model corresponding to the first pulling speed condition and the center solid phase ratio of the starting ingot to determine the starting position of the drawing and straightening machine to be arranged; and to apply the sub-slab solidification heat transfer model corresponding to the second pulling speed condition and the center solid phase ratio of the ending ingot to determine the ending position of the drawing and straightening machine to be arranged.

[0032] In one embodiment, the determining unit is used to:

[0033] Inputting the solid phase ratio of the starting ingot center into the sub-ingot solidification heat transfer model corresponding to the first pulling speed condition, and determining the distance from the meniscus output by the sub-ingot solidification heat transfer model as the starting position of the drawing and straightening machine to be arranged;

[0034] The ending ingot center solid phase ratio is input into the sub-ingot solidification heat transfer model corresponding to the second pulling speed condition, and the distance from the meniscus output by the sub-ingot solidification heat transfer model is determined as the ending position of the drawing and straightening machine to be arranged.

[0035] In one embodiment, the arrangement module comprises:

[0036] The arrangement unit is used to determine the arrangement position L of the i-th straightening machine to be arranged in the target continuous casting machine according to the following formula: i :

[0037]

[0038] Where N represents the number of tension and leveling machines to be arranged, L N Indicates the end position, L1 indicates the starting position, k indicates the preset ratio, M indicates the spacing between the tension and straightening machines, and 1≤i≤N.

[0039] In a third aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the continuous casting straightening machine arrangement method when executing the program.

[0040] In a fourth aspect, the present application provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the method for arranging a continuous casting straightening machine.

[0041] It can be seen from the above technical solution that the present application provides a method and device for arranging a continuous casting straightening machine. The method comprises: obtaining environmental information corresponding to the target continuous casting machine and the number of drawing and straightening machines to be arranged, wherein the environmental information comprises: the starting solid phase ratio of the center of the ingot, the first drawing speed condition corresponding to the starting solid phase ratio of the center of the ingot, the ending solid phase ratio of the center of the ingot, and the second drawing speed condition corresponding to the ending solid phase ratio of the center of the ingot; applying the environmental information and a preset ingot solidification heat transfer model to determine the starting position of the drawing and straightening machines to be arranged and the ending position of the drawing and straightening machines to be arranged; determining the arrangement position of each of the drawing and straightening machines to be arranged in the target continuous casting machine according to the starting position, the ending position, the preset ratio and the number of the drawing and straightening machines to be arranged, completing the arrangement of each of the drawing and straightening machines to be arranged, which can improve the reliability of the arrangement position of the drawing and straightening machines, and further improve the pressing effect of the ingot; specifically, according to the solidification characteristics of the ingot, the ingot belongs to the accelerated solidification process at the end of the solidification of the ingot, and the drawing and straightening machines are arranged at unequal intervals according to the solidification characteristics of the ingot, which can make full use of more drawing and straightening machines to press down the ingot, which can improve the pressing efficiency of the drawing and straightening machines and give full play to the maximum potential of the drawing and straightening machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a schematic diagram of the arrangement of a tensioning and straightening machine in the prior art;

[0044] Figure 2 It is a first flow diagram of the continuous casting straightening machine arrangement method in an embodiment of the present application;

[0045] Figure 3 It is a schematic diagram of the arrangement of a tensioning and straightening machine in an example of the present application;

[0046] Figure 4 It is a second flow diagram of the continuous casting straightening machine arrangement method in the embodiment of the present application;

[0047] Figure 5 It is a schematic diagram of the comparison of the corresponding relationship curves between the solid phase ratio at the center of the ingot and the distance from the meniscus under multiple casting speed conditions in an example of the present application;

[0048] Figure 6 It is a structural schematic diagram of a continuous casting straightening machine arrangement device in an embodiment of the present application;

[0049] Figure 7It is a schematic block diagram of the system structure of the electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] At present, square billet straightening machines are arranged at equal intervals. If the spacing between the straightening machines is too small, the straightening machines are compact but the installation space is limited. If the spacing between the straightening machines is too large, the number of effective straightening machines that can be used during the billet pressing process is limited. Figure 1 It is a schematic diagram of the arrangement of the tension and straightening machine in the prior art. Figure 1 It can be seen that the positional relationship between the liquid core 1, the pressing roller 2 and the billet shell 3. Based on this, the present application utilizes the solidification characteristics of the billet. At the end of the solidification of the billet, the billet belongs to the accelerated solidification process. The straightening machine is arranged at unequal intervals according to the solidification characteristics of the billet. More straightening machines can be fully utilized to press down the billet. A continuous casting straightening machine arrangement method and device are provided. The relevant mathematical model can be established in combination with the actual technical parameters of the continuous casting machine on site, including the billet cross-sectional size, the arc radius of the continuous casting machine, the length of the crystallizer, the length of each secondary cooling zone, the water flow rate of the crystallizer, the inlet and outlet water temperature difference, the water flow rate of each cooling zone in the secondary cooling zone, the pouring temperature, the working pulling speed, the physical properties of the casting steel type, etc. Secondly, the solidification characteristics of the relevant continuous casting billets are calculated according to the established mathematical model, the change of the solid phase ratio in the center of the billet under different working pulling speed conditions is determined, and the reasonable reduction range is determined; finally, the number of drawing and straightening machines is determined within a reasonable reduction range, and then the drawing and straightening machines are arranged at unequal intervals, which can improve the reduction efficiency of the reduction drawing and straightening machines and give full play to their maximum potential.

[0052] The details are described through the following embodiments.

[0053] In order to improve the reliability of the arrangement position of the straightening machine and thus improve the pressing effect of the cast billet, this embodiment provides a method for arranging a continuous casting straightening machine, the execution subject of which is a continuous casting straightening machine arrangement device, and the continuous casting straightening machine arrangement device includes but is not limited to a server, such as Figure 2 As shown, the method specifically includes the following contents:

[0054] Step 100: Obtain environmental information corresponding to the target continuous casting machine and the number of straightening machines to be arranged, wherein the environmental information includes: a starting ingot center solid phase ratio, a first pulling speed condition corresponding to the starting ingot center solid phase ratio, an ending ingot center solid phase ratio, and a second pulling speed condition corresponding to the ending ingot center solid phase ratio.

[0055] Specifically, the first pulling speed condition may represent the continuous casting machine pulling speed corresponding to the starting strand center solid phase ratio, and the second pulling speed condition may represent the continuous casting machine pulling speed corresponding to the ending strand center solid phase ratio. The straightening machine to be arranged may be equivalent to the continuous casting straightening machine.

[0056] Step 200: applying the environmental information and a preset solidification heat transfer model of the ingot to determine the starting position of the drawing and straightening machine to be arranged and the ending position of the drawing and straightening machine to be arranged.

[0057] Step 300: Determine the arrangement position of each of the to-be-arranged straightening machines in the target continuous casting machine according to the starting position, the ending position, the preset ratio and the number of the to-be-arranged straightening machines, and complete the arrangement of each of the to-be-arranged straightening machines.

[0058] like Figure 3 As shown, in one example, after the arrangement of each of the tension and leveling machines to be arranged is completed, the pressing rollers can be arranged at unequal intervals.

[0059] In order to improve the reliability of the solidification heat transfer model of the casting, Figure 4 As shown, in one embodiment, before step 200, the method further includes:

[0060] Step 001: Obtaining the layout information of the target continuous casting machine under multiple casting speed conditions, wherein the layout information under each casting speed condition includes: the center temperature and center solid fraction of the casting billet at multiple positions.

[0061] Step 002: Apply the layout information under each pulling speed condition to perform numerical simulation calculation on the ingot solidification heat transfer equation to obtain the sub-ingot solidification heat transfer model corresponding to the pulling speed condition. The boundary conditions of the ingot solidification heat transfer equation include: crystallizer thermal boundary conditions, secondary cooling zone boundary conditions and air cooling zone boundary conditions.

[0062] Specifically, the arrangement information under each pulling speed condition can be used to perform numerical simulation calculation on the solidification heat transfer equation of the casting billet to determine the values ​​of multiple parameters of the solidification heat transfer equation of the casting billet, and the values ​​of each parameter are substituted into the solidification heat transfer equation of the casting billet to obtain the sub-cast billet solidification heat transfer model corresponding to the pulling speed condition. The multiple parameters may include: density of molten steel, thermal conductivity of molten steel, specific heat capacity of molten steel and latent heat of solidification of molten steel; the solidification heat transfer equation of the casting billet may be:

[0063]

[0064] Where ρ is the density of molten steel, kg / m 3 ;c p is the specific heat capacity of molten steel, J / (kg·K); T is the ingot temperature, ℃; λ is the thermal conductivity of molten steel, W / (m·K); L is the latent heat of solidification of molten steel, J / kg, x is the ingot width, y is the ingot thickness, t is the time, f s is the central solid fraction, f s As shown below:

[0065]

[0066] Where, T l is the liquidus temperature of the steel grade, °C; T s is the solidus temperature, °C. In other words, the relevant mathematical model can be established according to the technical parameters of the continuous casting machine on site.

[0067] 1) The thermal boundary conditions of the crystallizer can be:

[0068]

[0069] In the formula, q m is the heat flux density of the crystallizer, W / m 2 ; L m is the length of the crystallizer, m; u cast is the continuous casting machine pulling speed, m / min, the continuous casting machine pulling speed can be equivalent to the above pulling speed conditions; a, b are empirical constants, a is taken as 2680000, and b is calculated according to the following formula.

[0070]

[0071] In the formula, is the average heat flux density of the crystallizer, W / m 2 .

[0072] The average heat flux density is expressed as:

[0073]

[0074] In the formula, c w is the specific heat capacity of cooling water, J / (kg·K); m is the cooling water flow rate of the crystallizer, kg / s; ΔT is the temperature difference of the cooling water in the crystallizer, K; S eff is the effective area of ​​the crystallizer, m 2 .

[0075] 2) The boundary conditions of the secondary cooling zone can be:

[0076] The heat carried away by radiation from the surface of the ingot accounts for a small proportion of the total heat transfer. Most of the heat is carried away by spray droplets in the form of heat exchange. The heat flux density in the secondary cooling zone is:

[0077]

[0078] In the formula, q s is the heat flux density of each secondary cooling zone, W / m 2 ; h is the convective heat transfer coefficient, W / (m 2 ·K); T surf is the surface temperature of the casting, K; T w is the cooling water temperature, ℃.

[0079] 3) The boundary conditions of the air cooling zone can be:

[0080] In the air cooling area, the radiation heat transfer expression is:

[0081]

[0082] In the formula, q a is the heat flux density in the air cooling zone, W / m 2 ; σ is the Boltzmann constant, 5.67×10 -8 , ε is the surface blackness of the ingot, which is 0.8, T a is the ambient temperature.

[0083] In order to improve the reliability of determining the starting position and the ending position, in one embodiment, step 200 includes:

[0084] Step 201: Apply the sub-slab solidification heat transfer model corresponding to the first pulling speed condition and the center solid phase ratio of the starting ingot to determine the starting position of the drawing and straightening machine to be arranged; apply the sub-slab solidification heat transfer model corresponding to the second pulling speed condition and the center solid phase ratio of the ending ingot to determine the ending position of the drawing and straightening machine to be arranged.

[0085] Specifically, the sub-cast billet solidification heat transfer model corresponding to the first pulling speed condition can be: the corresponding relationship curve between the solid phase ratio of the center of the billet and the distance from the meniscus under the first pulling speed condition, and the sub-cast billet solidification heat transfer model corresponding to the second pulling speed condition can be: the corresponding relationship curve between the solid phase ratio of the center of the billet and the distance from the meniscus under the second pulling speed condition. The sub-cast billet solidification heat transfer models corresponding to the first pulling speed condition and the second pulling speed condition can be obtained in advance through numerical simulation calculations. Figure 5 As shown, in one example, curves A to F respectively represent the corresponding relationship between the solid phase fraction at the center of the ingot and the distance from the meniscus under the pulling speed conditions of 0.26m / min, 0.28m / min, 0.30m / min, 0.32m / min, 0.34m / min and 0.36m / min.

[0086] In order to further improve the reliability of determining the starting position and the ending position, in one embodiment, step 201 includes:

[0087] Step 2011: input the starting ingot center solid phase ratio into the sub-ingot solidification heat transfer model corresponding to the first drawing speed condition, and determine the distance from the meniscus output by the sub-ingot solidification heat transfer model as the starting position of the drawing and straightening machine to be arranged.

[0088] Step 2012: input the ending ingot center solid phase ratio into the sub-ingot solidification heat transfer model corresponding to the second drawing speed condition, and determine the distance from the meniscus output by the sub-ingot solidification heat transfer model as the ending position of the drawing and straightening machine to be arranged.

[0089] In order to improve the reliability of the tension and leveling machine arrangement, in one embodiment, step 300 includes:

[0090] The layout position L of the i-th straightening machine to be arranged in the target continuous casting machine is determined according to the following formula i :

[0091]

[0092] Where N represents the number of tension and leveling machines to be arranged, L N represents the end position, L1 represents the starting position, k represents the preset ratio, M represents the spacing between the tension and leveling machines, and 1≤i≤N. The preset ratio can be set according to actual conditions, and this application does not limit this.

[0093] In order to further illustrate the present solution, the present application provides an application example of a method for arranging a continuous casting straightening machine, which is specifically described as follows:

[0094] Step 11: Combined with the actual technical parameters of the continuous casting machine on site, including: billet cross-sectional dimensions, arc radius of the continuous casting machine, length of the crystallizer, length of each secondary cooling zone, water flow rate of the crystallizer, inlet and outlet water temperature difference, water flow rate of each cooling zone in the secondary cooling zone, pouring temperature, working casting speed, physical properties of the casting steel type, etc., establish a relevant mathematical model. The functions realized by the relevant mathematical model can be equivalent to the functions realized by the above-mentioned preset billet solidification heat transfer model. The billet solidification heat transfer adopts two-dimensional non-steady-state heat transfer, and the billet solidification heat transfer equation is as follows:

[0095]

[0096] Where ρ is the density of molten steel, kg / m 3 ;c p is the specific heat capacity, J / (kg·K); T is the billet temperature, ℃; λ is the thermal conductivity of the test steel billet, W / (m·K); L is the latent heat of solidification, J / kg, x is the billet width, y is the billet thickness, f sis the central solid fraction, f s As shown below:

[0097]

[0098] Where, T l is the liquidus temperature of the steel grade, °C; T s is the solidus temperature, °C. In other words, the relevant mathematical model can be established according to the technical parameters of the continuous casting machine on site.

[0099] 1) Crystallizer thermal boundary conditions:

[0100]

[0101] In the formula, q m is the heat flux density of the crystallizer, W / m 2 ; L m is the length of the crystallizer, m; u cast is the casting speed of the continuous casting machine, m / min; a and b are empirical constants, a is taken as 2680000, and b is calculated according to the following formula.

[0102]

[0103] In the formula, is the average heat flux density of the crystallizer, W / m 2 .

[0104] The average heat flux density is expressed as:

[0105]

[0106] In the formula, c w is the specific heat capacity of cooling water, J / (kg·K); m is the cooling water flow rate of the crystallizer, kg / s; ΔT is the temperature difference of the cooling water in the crystallizer, K; S eff is the effective area of ​​the crystallizer, m 2 .

[0107] 2) Boundary conditions of the second cooling zone:

[0108] The heat carried away by radiation from the surface of the ingot accounts for a small proportion of the total heat transfer. Most of the heat is carried away by spray droplets in the form of heat exchange. The heat flux density in the secondary cooling zone is:

[0109]

[0110] In the formula, q s is the heat flux density of each secondary cooling zone, W / m 2 ; h is the convective heat transfer coefficient, W / (m 2 ·K); T surf is the surface temperature of the casting, K; T wis the cooling water temperature, ℃.

[0111] 3) Boundary conditions of air cooling zone:

[0112] In the air cooling area, the radiation heat transfer expression is:

[0113]

[0114] In the formula, q a is the heat flux density in the air cooling zone, W / m 2 ; σ is the Boltzmann constant, 5.67×10 -8 , ε is the surface blackness of the ingot, which is 0.8, T a is the ambient temperature.

[0115] Step 12: Calculate the solidification characteristics of the relevant continuous casting billet according to the established mathematical model, determine the change of the solid phase ratio at the center of the billet under different working pulling speed conditions, and determine the position of the reasonable reduction range. Determine the reasonable reduction range within the working pulling speed range of the continuous casting machine. The reasonable reduction range is usually between 0.3 and 0.8 of the solid phase ratio at the center of the billet. Select the position of 0.3 of the solid phase ratio at the center of the billet under the minimum working pulling speed as the starting position L1 for arranging the straightening machine, and select the position of 0.8 of the solid phase ratio at the center of the billet under the maximum working pulling speed as the ending position L for arranging the straightening machine. N .

[0116] Step 13: Arrange the straightening machines at unequal intervals within the determined reasonable pressing range. According to the determined reasonable pressing range, the number of straightening machines arranged is N, the position of the first straightening machine is L1, the position of the second straightening machine is L1+M, the position of the third straightening machine is L1+M+k·M, and the position of the N-1 straightening machine is L1+M+k·M+k. 2 ·M+…+k N-3 ·M, where M is the spacing and k is the ratio (k<1.0) (Note: The position of the Nth tension and leveling machine is L1+M+k·M+……+k N-2 M=L N , once one of the spacing M or ratio k is determined, the other can be determined).

[0117] From the above description, it can be seen that the continuous casting straightening machine arrangement method provided in this application example can arrange the straightening machines at unequal distances according to the characteristics of accelerated reinforcement of the continuous casting billet in the later stage of solidification, thereby ensuring that more straightening machines are put into use within the effective pressing range, thereby ensuring the pressing effect of the billet and improving the quality of the billet.

[0118] In order to further illustrate the present solution, the present application provides a specific application example of the arrangement method of a continuous casting straightening machine, which is specifically described as follows:

[0119] The technical scheme of the above method is now implemented for the arrangement of the straightening machine of the 550mm×700mm rectangular billet continuous casting machine:

[0120] Step 21: Establish relevant mathematical models based on the actual technical parameters of the continuous casting machine on site. The solidification heat transfer of the ingot adopts two-dimensional non-steady-state heat transfer. The specific solidification heat transfer equation of the ingot is as follows:

[0121]

[0122] Where ρ is the density of molten steel, kg / m 3 ;c p is the specific heat capacity, J / (kg·K); T is the casting temperature, ℃; λ is the thermal conductivity of the test steel casting, W / (m·K); L is the latent heat of solidification, J / kg, f s is the central solid phase ratio. The boundary conditions of the solidification heat transfer equation of the ingot include: the thermal boundary conditions of the crystallizer, the boundary conditions of the secondary cooling zone and the boundary conditions of the air cooling zone.

[0123] Step 22: Calculate the solidification characteristics of the relevant continuous casting billet according to the established mathematical model, such as Figure 1 As shown. The working pulling speed range of 550mm×700mm rectangular billet is 0.26m / min~0.34m / min. Under the pulling speed of 0.26m / min, the distance from the meniscus to the position with a solid phase ratio of 0.3 in the center of the billet is 15.20m, which is used as the starting position of the straightening machine. Under the pulling speed of 0.34m / min, the distance from the meniscus to the position with a solid phase ratio of 0.8 in the center of the billet is 24.90m, which is used as the ending position of the straightening machine.

[0124] Step 23: Arrange the straightening machines at unequal intervals within the reasonable range of pressure reduction. The number of straightening machines arranged within the reasonable pressure reduction position interval is determined to be 6. The position of the first straightening machine is 15.20m, the position of the second straightening machine is (15.2+2.46=17.66)m, the position of the third straightening machine is (15.2+2.46+0.88×2.46=19.83)m, and the position of the fourth straightening machine is (15.2+2.46+0.88×2.46+0.88 2 ×2.46=21.74)m, then the position of the fifth straightening machine is (15.2+2.46+0.88×2.46+0.88 2 ×2.46+0.88 3 ×2.46=23.42)m, where the spacing M is 2.46 and the ratio k is 0.88 (a<1.0).

[0125] From the software level, in order to improve the reliability of the arrangement position of the straightening machine and thus improve the pressing effect of the cast billet, the present application provides an embodiment of a continuous casting straightening machine arrangement device for realizing all or part of the contents of the continuous casting straightening machine arrangement method, see Figure 6 The continuous casting straightening machine arrangement device specifically includes the following contents:

[0126] The first acquisition module 01 is used to acquire the environmental information corresponding to the target continuous casting machine and the number of straightening machines to be arranged, wherein the environmental information includes: the starting center solid phase ratio of the ingot, the first pulling speed condition corresponding to the starting center solid phase ratio of the ingot, the ending center solid phase ratio of the ingot, and the second pulling speed condition corresponding to the ending center solid phase ratio of the ingot;

[0127] A position determination module 02 is used to determine the starting position of the drawing and straightening machine to be arranged and the ending position of the drawing and straightening machine to be arranged by applying the environmental information and a preset solidification heat transfer model of the ingot;

[0128] Arrangement module 03 is used to determine the arrangement position of each of the to-be-arranged straightening machines in the target continuous casting machine according to the starting position, the ending position, the preset ratio and the number of the to-be-arranged straightening machines, and complete the arrangement of each of the to-be-arranged straightening machines.

[0129] In one embodiment, the continuous casting straightening machine arrangement device further includes:

[0130] A second acquisition module is used to acquire the layout information of the target continuous casting machine under multiple casting speed conditions, wherein the layout information under each casting speed condition includes: the center temperature and center solid phase ratio of the casting billet at multiple positions;

[0131] A parameter value determination module is used to apply the layout information under each pulling speed condition to perform numerical simulation calculations on the ingot solidification heat transfer equation to obtain a sub-ingot solidification heat transfer model corresponding to the pulling speed condition, wherein the boundary conditions of the ingot solidification heat transfer equation include: a crystallizer thermal boundary condition, a secondary cooling zone boundary condition, and an air cooling zone boundary condition; and the preset ingot solidification heat transfer model includes: sub-ingot solidification heat transfer models corresponding to each of the pulling speed conditions.

[0132] In one embodiment, the location determination module includes:

[0133] A determination unit is used to apply the sub-slab solidification heat transfer model corresponding to the first pulling speed condition and the center solid phase ratio of the starting ingot to determine the starting position of the drawing and straightening machine to be arranged; and to apply the sub-slab solidification heat transfer model corresponding to the second pulling speed condition and the center solid phase ratio of the ending ingot to determine the ending position of the drawing and straightening machine to be arranged.

[0134] In one embodiment, the determining unit is used to:

[0135] Inputting the solid phase ratio of the starting ingot center into the sub-ingot solidification heat transfer model corresponding to the first pulling speed condition, and determining the distance from the meniscus output by the sub-ingot solidification heat transfer model as the starting position of the drawing and straightening machine to be arranged;

[0136] The ending ingot center solid phase ratio is input into the sub-ingot solidification heat transfer model corresponding to the second pulling speed condition, and the distance from the meniscus output by the sub-ingot solidification heat transfer model is determined as the ending position of the drawing and straightening machine to be arranged.

[0137] In one embodiment, the arrangement module comprises:

[0138] The arrangement unit is used to determine the arrangement position L of the i-th straightening machine to be arranged in the target continuous casting machine according to the following formula: i :

[0139]

[0140] Where N represents the number of tension and leveling machines to be arranged, L N Indicates the end position, L1 indicates the starting position, k indicates the preset ratio, M indicates the spacing between the tension and straightening machines, and 1≤i≤N.

[0141] The embodiment of the continuous casting, straightening machine arrangement device provided in this specification can be specifically used to execute the processing flow of the embodiment of the above-mentioned continuous casting, straightening machine arrangement method. Its functions will not be repeated here, and reference can be made to the detailed description of the embodiment of the above-mentioned continuous casting, straightening machine arrangement method.

[0142] Figure 7 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention, such as Figure 7 As shown, the electronic device includes: a memory 701, a processor 702, and a computer program stored in the memory 701 and executable on the processor 702. When the processor 702 executes the computer program, the following method is implemented:

[0143] Obtaining environmental information corresponding to the target continuous casting machine and the number of straightening machines to be arranged, the environmental information including: a starting billet center solid phase ratio, a first pulling speed condition corresponding to the starting billet center solid phase ratio, an ending billet center solid phase ratio, and a second pulling speed condition corresponding to the ending billet center solid phase ratio;

[0144] Applying the environmental information and a preset solidification heat transfer model of the ingot, determining the starting position of the drawing and straightening machine to be arranged and the ending position of the drawing and straightening machine to be arranged;

[0145] According to the starting position, the ending position, the preset ratio and the number of the drawing and straightening machines to be arranged, the arrangement position of each of the drawing and straightening machines to be arranged in the target continuous casting machine is determined, and the arrangement of each of the drawing and straightening machines to be arranged is completed.

[0146] This embodiment discloses a computer program product, the computer program product including a computer program, and when the computer program is executed by a processor, the following method is implemented:

[0147] Obtaining environmental information corresponding to the target continuous casting machine and the number of straightening machines to be arranged, the environmental information including: a starting billet center solid phase ratio, a first pulling speed condition corresponding to the starting billet center solid phase ratio, an ending billet center solid phase ratio, and a second pulling speed condition corresponding to the ending billet center solid phase ratio;

[0148] Applying the environmental information and a preset solidification heat transfer model of the ingot, determining the starting position of the drawing and straightening machine to be arranged and the ending position of the drawing and straightening machine to be arranged;

[0149] According to the starting position, the ending position, the preset ratio and the number of the drawing and straightening machines to be arranged, the arrangement position of each of the drawing and straightening machines to be arranged in the target continuous casting machine is determined, and the arrangement of each of the drawing and straightening machines to be arranged is completed.

[0150] This embodiment provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following method is implemented:

[0151] Obtaining environmental information corresponding to the target continuous casting machine and the number of straightening machines to be arranged, the environmental information including: a starting billet center solid phase ratio, a first pulling speed condition corresponding to the starting billet center solid phase ratio, an ending billet center solid phase ratio, and a second pulling speed condition corresponding to the ending billet center solid phase ratio;

[0152] Applying the environmental information and a preset solidification heat transfer model of the ingot, determining the starting position of the drawing and straightening machine to be arranged and the ending position of the drawing and straightening machine to be arranged;

[0153] According to the starting position, the ending position, the preset ratio and the number of the drawing and straightening machines to be arranged, the arrangement position of each of the drawing and straightening machines to be arranged in the target continuous casting machine is determined, and the arrangement of each of the drawing and straightening machines to be arranged is completed.

[0154] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0155] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0156] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0157] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0158] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0159] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for arranging a continuous casting straightening machine, characterized in that: include: Obtaining environmental information corresponding to the target continuous casting machine and the number of straightening machines to be arranged, the environmental information including: a starting billet center solid phase ratio, a first pulling speed condition corresponding to the starting billet center solid phase ratio, an ending billet center solid phase ratio, and a second pulling speed condition corresponding to the ending billet center solid phase ratio; Applying the environmental information and a preset solidification heat transfer model of the ingot, determining the starting position of the drawing and straightening machine to be arranged and the ending position of the drawing and straightening machine to be arranged; According to the starting position, the ending position, the preset ratio and the number of the drawing and straightening machines to be arranged, the arrangement position of each of the drawing and straightening machines to be arranged in the target continuous casting machine is determined, and the arrangement of each of the drawing and straightening machines to be arranged is completed.

2. The method for arranging a continuous casting straightening machine according to claim 1, characterized in that: Also includes: Acquiring the layout information of the target continuous casting machine under multiple casting speed conditions, wherein the layout information under each casting speed condition includes: the center temperature and the center solid phase ratio of the casting billet at multiple positions; Applying the arrangement information under each pulling speed condition to perform numerical simulation calculation on the solidification heat transfer equation of the ingot, a sub-ingot solidification heat transfer model corresponding to the pulling speed condition is obtained, wherein the boundary conditions of the solidification heat transfer equation of the ingot include: a crystallizer thermal boundary condition, a secondary cooling zone boundary condition, and an air cooling zone boundary condition; The preset ingot solidification heat transfer model includes: sub-ingot solidification heat transfer models corresponding to various pulling speed conditions.

3. The method for arranging a continuous casting and straightening machine according to claim 1, characterized in that: The applying the environmental information and the preset solidification heat transfer model of the ingot to determine the starting position of the drawing and straightening machine to be arranged and the ending position of the drawing and straightening machine to be arranged, comprises: The starting position of the drawing and straightening machine to be arranged is determined by applying the sub-slab solidification heat transfer model corresponding to the first drawing speed condition and the solid phase ratio at the center of the starting billet; the ending position of the drawing and straightening machine to be arranged is determined by applying the sub-slab solidification heat transfer model corresponding to the second drawing speed condition and the solid phase ratio at the center of the ending billet.

4. The method for arranging a continuous casting and straightening machine according to claim 3, characterized in that: The sub-cast slab solidification heat transfer model corresponding to the first pulling speed condition and the center solid phase ratio of the starting cast slab are applied to determine the starting position of the drawing and straightening machine to be arranged; Applying the sub-cast billet solidification heat transfer model corresponding to the second pulling speed condition and the end billet center solid phase ratio to determine the end position of the drawing and straightening machine to be arranged, including: Inputting the solid phase ratio of the starting ingot center into the sub-ingot solidification heat transfer model corresponding to the first pulling speed condition, and determining the distance from the meniscus output by the sub-ingot solidification heat transfer model as the starting position of the drawing and straightening machine to be arranged; The ending ingot center solid phase ratio is input into the sub-ingot solidification heat transfer model corresponding to the second pulling speed condition, and the distance from the meniscus output by the sub-ingot solidification heat transfer model is determined as the ending position of the drawing and straightening machine to be arranged.

5. The method for arranging a continuous casting and straightening machine according to claim 1, characterized in that: The step of determining the arrangement position of each of the to-be-arranged straightening machines in the target continuous casting machine according to the starting position, the ending position, the preset ratio and the number of the to-be-arranged straightening machines comprises: The layout position L of the i-th straightening machine to be arranged in the target continuous casting machine is determined according to the following formula i : Where N represents the number of tension and leveling machines to be arranged, L N Indicates the end position, L1 indicates the starting position, k indicates the preset ratio, M indicates the spacing between the tension and straightening machines, and 1≤i≤N.

6. A continuous casting straightening machine arrangement device, characterized in that: include: The first acquisition module is used to acquire the environmental information corresponding to the target continuous casting machine and the number of the drawing and straightening machines to be arranged, wherein the environmental information includes: the starting center solid phase ratio of the ingot, the first drawing speed condition corresponding to the starting center solid phase ratio of the ingot, the ending center solid phase ratio of the ingot, and the second drawing speed condition corresponding to the ending center solid phase ratio of the ingot; A position determination module, used to apply the environmental information and a preset solidification heat transfer model of the ingot to determine the starting position of the drawing and straightening machine to be arranged and the ending position of the drawing and straightening machine to be arranged; The arrangement module is used to determine the arrangement position of each of the to-be-arranged straightening machines in the target continuous casting machine according to the starting position, the ending position, the preset ratio and the number of the to-be-arranged straightening machines, and complete the arrangement of each of the to-be-arranged straightening machines.

7. The continuous casting and straightening machine arrangement device according to claim 6, characterized in that: Also includes: A second acquisition module is used to acquire the layout information of the target continuous casting machine under multiple casting speed conditions, wherein the layout information under each casting speed condition includes: the center temperature and center solid phase ratio of the casting billet at multiple positions; A parameter value determination module is used to perform numerical simulation calculation on the solidification heat transfer equation of the ingot using the arrangement information under each pulling speed condition to obtain a sub-ingot solidification heat transfer model corresponding to the pulling speed condition, wherein the boundary conditions of the ingot solidification heat transfer equation include: a crystallizer thermal boundary condition, a secondary cooling zone boundary condition, and an air cooling zone boundary condition; The preset ingot solidification heat transfer model includes: sub-ingot solidification heat transfer models corresponding to various pulling speed conditions.

8. The continuous casting and straightening machine arrangement device according to claim 6, characterized in that: The position determination module comprises: A determination unit is used to apply the sub-slab solidification heat transfer model corresponding to the first pulling speed condition and the center solid phase ratio of the starting ingot to determine the starting position of the drawing and straightening machine to be arranged; and to apply the sub-slab solidification heat transfer model corresponding to the second pulling speed condition and the center solid phase ratio of the ending ingot to determine the ending position of the drawing and straightening machine to be arranged.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the continuous casting and straightening machine arrangement method according to any one of claims 1 to 5 is implemented.

10. A computer-readable storage medium having computer instructions stored thereon, characterized in that: When the instructions are executed by the processor, the continuous casting straightening machine arrangement method according to any one of claims 1 to 5 is implemented.

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