A dynamic control method for accelerating the ingot solidification process

Abstract

The application discloses a dynamic control method for accelerating ingot solidification process, and belongs to the technical field of ingot solidification production. The dynamic control method is characterized by the following steps: helium gas is introduced into the air gap between the poured ingot and the pouring mold for cooling; the cooling flow and pressure of the introduced helium gas are dynamically adjusted in real time according to the cooling condition of the ingot core, so that the temperature of the ingot core is rapidly reduced, thereby accelerating the solidification process of the ingot and improving the internal quality of the ingot. The dynamic control method for accelerating ingot solidification process is characterized by the following steps: firstly, the best data database is constructed by using the process parameters of the pressure and flow rate of the helium gas introduced into the air gap between the ingot and the metal mold; secondly, the process parameters of the pressure and flow rate of the introduced helium gas are compared with the corresponding database data to obtain the helium gas cooling parameter deviation value; and finally, the pressure and flow rate of the introduced helium gas are adjusted according to the judgment result.

Description

Technical Field

[0001] This invention belongs to the technical field of ingot solidification production, and relates to a dynamic control method for accelerating the ingot solidification process. Background Technology

[0002] In existing ingot casting processes, high-temperature molten metal enters the mold cavity through bottom casting or top casting. Under the heat absorption of the mold, the surface of the ingot cools and solidifies to form a shell. Due to thermal contraction, the solidified shell quickly detaches from the mold cavity, creating air gaps, significantly increasing interfacial heat transfer resistance and noticeably reducing the cooling rate. As heat slowly dissipates, the molten metal in the ingot core gradually solidifies. Due to the difference in solubility of solute elements in the solid and liquid phases, they are continuously discharged from the solid phase and enriched in the interdendritic liquid phase. Under the influence of thermal buoyancy, solute buoyancy, grain precipitation, and solid-phase deformation, the enriched solute elements are transported over long distances with the liquid-phase flow and solid-phase migration, resulting in elemental fluctuations across a large area of ​​the ingot and forming macroscopic solute segregation.

[0003] For interstitial atoms such as carbon, the high-temperature diffusion coefficient is relatively large, and they can diffuse evenly during the subsequent ingot heating process.

[0004] However, for substitutional atoms such as manganese, chromium, and nickel, their solid-phase diffusion rate is very slow. Even after prolonged high-temperature annealing, large-scale elemental segregation of manganese, chromium, and nickel still exists in the ingot. This is especially true for large-sized solidified ingots of high-solute alloys, such as nickel-based superalloys, high-carbon bearing steel, and titanium-based alloys. The high solute content results in high thermal resistance and slow solidification rate, ultimately leading to severe macroscopic segregation within the ingot, which deteriorates the uniformity of the microstructure and the mechanical properties of the product.

[0005] To address solidification defects in continuously cast ingots, high-temperature diffusion annealing is the primary method. This process heats the ingot to a high temperature to increase the diffusion rate of solute elements, thus achieving homogenization of the continuously cast billet. However, due to the low diffusion coefficients of elements such as manganese, chromium, and nickel, high-temperature diffusion annealing has very limited effect on improving macroscopic segregation. Furthermore, high-temperature diffusion annealing generally suffers from long process cycles, high energy consumption, and low productivity, severely impacting the homogenization of large-size ingots. Currently, no specific technical control methods have emerged to improve the solidification quality of ingots.

[0006] Chinese patent CN105586635A discloses a device and method for rapid solidification of ingots. The device rapidly cools the ingots through a bottom heat exchange platform and a chemical endothermic reaction heat exchanger. The cooling device has a complex structure, the cooling rate is generally not controllable, the indirect cooling method consumes a lot of energy, and the cost of its chemical endothermic reaction is high, which is not conducive to large-scale industrial production.

[0007] Chinese patent CN109261913A discloses a device for improving the solidification quality of ingots cast in a vacuum induction furnace. However, the position and connection of the helium cooling conduit are not specified. Water cooling and helium cooling methods cannot precisely adjust the cooling rate of the ingot core. As can be seen from its embodiments, it only focuses on the pressure of the introduced helium and does not consider the influence of the helium flow rate and the selection of water cooling process parameters on the cooling structure of the ingot core. It cannot be controlled in real time, and the segregation problem is not effectively solved.

[0008] Chinese patent CN108555256A discloses a device and method for improving the solidification quality of vacuum induction casting ingots. However, the device structure does not specify the components, positions, or connections for filling argon and helium. The timing for filling argon and helium is when the casting reaches half the height of the ingot mold. Obviously, the gap is small, resulting in less argon and helium being introduced, leading to a low cooling effect. Furthermore, the influence of argon and helium pressure and flow rate on the cooling structure of the ingot core is not considered, making real-time control impossible and failing to effectively solve the segregation problem.

[0009] To address the aforementioned solidification defects in large-sized ingots and further improve ingot production efficiency, this invention proposes a method for accelerating the solidification process and dynamic control. Summary of the Invention

[0010] The technical problem to be solved by this invention is how to overcome the solidification defects of large-size ingots in the prior art. Among them, large-size ingots with low diffusion coefficients of elements such as manganese, chromium, and nickel will suffer from technical defects such as long process cycle, high energy consumption, and low productivity when subjected to high-temperature annealing. Indirect cooling methods are energy-intensive, costly, and inefficient. The influencing factors of water cooling and helium cooling combined are difficult to control accurately and effectively. The timing and targeted gaps of helium cooling alone make it difficult to match the cooling rate and the cooling structure of the ingot core well. Therefore, it is not possible to achieve industrial-level dynamic control of accelerating the ingot solidification process.

[0011] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0012] A dynamic control method for accelerating the solidification process of ingots is disclosed. The dynamic control method involves introducing helium gas into the air gap between the cast ingot and the casting mold for cooling, and dynamically adjusting the cooling flow rate and pressure of the helium gas in real time according to the cooling status of the ingot core, so as to rapidly reduce the temperature of the ingot core, thereby accelerating the solidification process of the ingot and improving the internal quality of the ingot.

[0013] Preferably, the top cover is a circular mold sealing cover, and a helium pressure gauge and a helium outlet are provided in the center of the circular mold sealing cover to ensure that a certain helium pressure and helium flow rate are formed in the mold cavity; a helium inlet is provided at the bottom of the casting mold to introduce helium after the solidified shell of the ingot is formed.

[0014] Preferably, the casting mold includes a mold shell; a helium inlet is provided at the bottom of the side wall of the mold shell, and a helium inlet valve is provided at the outer end of the helium inlet; a top cover is provided on the mold shell, and a helium outlet and a helium pressure gauge are provided on the top cover, and a helium outlet valve is provided at the outer end of the helium outlet.

[0015] Preferably, the step of dynamically adjusting the cooling flow rate and pressure of the introduced helium gas is as follows:

[0016] S1. Establish a database of optimal helium cooling parameters based on the composition and microstructure of small-sized ingots.

[0017] S2. Based on the actual casting of large-size ingots, collect data on the ingot cooling helium flow rate and helium pressure in real time, and retrieve the optimal helium flow rate and optimal helium pressure data for ingots of this composition from the database in step S1.

[0018] S3. Obtain the helium flow rate deviation value and helium pressure deviation value by performing online calculations on the data in step S2.

[0019] S4. Determine the deviation values ​​of helium flow rate and helium pressure in step S3, and adjust the actual helium cooling parameters according to the determination results to achieve dynamic control.

[0020] Preferably, step S1 specifically includes the following steps:

[0021] S101. Employ a small-size ingot solidification experiment method to continuously measure the temperature change of the ingot core.

[0022] S102. Helium gas is introduced between the small-sized ingot and the cast iron mold. By adjusting the helium gas flow rate and helium gas pressure, the temperature change of the ingot core is continuously measured. Based on step S101 and the temperature measurement results of the aforementioned small-sized ingot, the optimal helium gas parameters under different temperature conditions are determined, thereby obtaining the temperature measurement results of the small-sized ingot core.

[0023] S103. Based on the temperature measurement results of the small-sized ingot core in step S102, the helium flow rate and helium pressure corresponding to the fastest cooling rate in the ingot core at different temperatures are taken as the optimal helium cooling parameters, and they are stored in the computer to establish a database of the optimal helium cooling parameters for the ingot.

[0024] Preferably, the specific steps of step S101 are as follows: pouring the high-temperature alloy liquid into a small-sized ingot, inserting a thermocouple at the center of the ingot, and continuously measuring the temperature change of the ingot core by using the thermocouple readings.

[0025] Preferably, step S102, adjusting the helium flow rate and helium pressure, involves adjusting the parameter values ​​of the helium flow rate and helium pressure by adjusting the preset values ​​of the opening of the helium inlet and outlet valves.

[0026] Preferably, the temperature change of the ingot core at different temperatures obtained in step S102 can be obtained through multiple orthogonal experiments, from which the optimal parameters for helium cooling of the ingot can be derived.

[0027] Preferably, the specific steps of step S103 are as follows: a detailed comparison of the temperature measurement results of the small-sized ingot core in step S102 is performed. It is necessary to plot the continuous temperature change curves of the small-sized ingot core, find the continuous change curve corresponding to the temperature with the fastest cooling rate, and then find the helium flow rate and helium pressure corresponding to the continuous change curve, which are used as the optimal helium cooling parameters. After that, the parameters are stored in the computer and a database of the optimal helium cooling parameters for the ingot is established.

[0028] Preferably, if the ingot composition is Inconel 718 alloy, the optimal helium cooling flow rate is 5 L / min and the optimal helium pressure is 300 kPa.

[0029] Preferably, in step S3, the helium flow rate deviation value is the difference between the real-time collected data of the helium flow rate for cooling the ingot and the data of the optimal helium flow rate for the ingot with this composition retrieved from the database, and the helium pressure deviation value is the difference between the real-time collected data of the helium pressure for cooling the ingot and the data of the optimal helium pressure for the ingot with this composition retrieved from the database.

[0030] Preferably, in step S4, when both the helium flow rate deviation and the helium pressure deviation are zero, the current cooling helium flow rate and helium pressure are the optimal helium parameter values ​​for dynamic adjustment; when at least one of the helium flow rate deviation and the helium pressure deviation is not zero, the preset opening values ​​of the helium inlet and outlet valves need to be adjusted until both the helium flow rate deviation and the helium pressure deviation are zero.

[0031] Preferably, in step S4, when at least one of the helium flow rate deviation value and the helium pressure deviation value is not zero, the specific situation is as follows:

[0032] When the helium flow deviation value is positive, the current actual helium flow is large. The computer reduces the preset value of the helium inlet valve opening and quickly adjusts the helium flow until the optimal value.

[0033] If the helium flow deviation value is negative, the current actual helium flow is small. The computer increases the preset value of the helium inlet valve opening and increases the helium flow until it reaches the optimal value.

[0034] If the helium pressure deviation value is positive, the current actual helium pressure is relatively high. The computer increases the preset value of the helium outlet valve opening to reduce the helium pressure.

[0035] If the helium pressure deviation value is negative, the current actual helium pressure is low. The computer will reduce the preset value of the helium outlet valve opening and increase the helium pressure to the optimal pressure.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] In the above scheme, during the solidification process of the ingot, the present invention introduces helium gas at a certain pressure and flow rate into the air gap between the ingot and the metal mold, thereby changing the radiative heat transfer mode in the air gap to the conductive heat transfer mode, which greatly reduces the thermal resistance of the air gap, significantly improves the cooling rate of the ingot, accelerates the solidification process, shortens the solidification time, and improves the quality of the ingot core.

[0038] In this invention, the pressure and flow rate parameters of helium gas introduced into the air gap are determined based on the composition of the alloy in the ingot. By establishing a database of the optimal parameters of helium cooling flow rate and helium pressure for small-sized ingot alloys, the helium cooling flow rate and helium pressure are dynamically adjusted in real time to improve the solidification rate of the ingot.

[0039] This invention addresses the technical shortcomings of high-temperature annealing of large-sized ingots with low diffusion coefficients, such as manganese, chromium, and nickel, which result in long process cycles, high energy consumption, and low productivity. It employs a direct control cooling technique that dynamically adjusts the helium cooling flow rate and pressure in real time to achieve industrial-level dynamic control of the ingot solidification process.

[0040] During the solidification process of the ingot, an air gap is formed between the ingot and the mold due to thermal contraction. Helium gas is introduced into the bottom of the ingot and flows from the air gap at the bottom to the top, and then flows out through the helium outlet at the top of the ingot. By dynamically adjusting the cooling flow rate and pressure of the helium gas, the temperature change of the ingot core can be regulated, so that the microstructure of the cooled ingot is uniform and the degree of segregation is greatly reduced.

[0041] In summary, the dynamic control method for accelerating the solidification process of ingots of the present invention first establishes a database of optimal data on the process parameters of the pressure and flow rate of helium gas introduced into the air gap between the ingot and the metal mold. Then, the process parameters of the pressure and flow rate of helium gas introduced in real time are compared with the corresponding database data to obtain the deviation value of the helium cooling parameters. Based on the judgment result, the pressure and flow rate of helium gas introduced are adjusted. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the casting mold structure in the dynamic control method for accelerating the solidification process of ingots according to the present invention.

[0044] Figure 2 This is a flowchart of the dynamic control method for accelerating the solidification process of ingots according to the present invention;

[0045] Figure 3 This is a graph showing the temperature change of the ingot core under helium cooling conditions according to the present invention. Detailed Implementation

[0046] The technical solutions and problems solved by the embodiments of the present invention will be described below with reference to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0047] Example 1

[0048] A dynamic control method for accelerating the solidification process of an ingot, wherein the ingot composition is selected as Inconel 718 alloy.

[0049] like Figure 1 As shown, the casting mold includes a mold 1; a helium inlet 2 is provided at the bottom of the side wall of the mold 1, and a helium inlet valve 3 is provided at the outer end of the helium inlet 2; a top cover 4 is provided on the mold 1, and a helium outlet 5 and a helium pressure gauge 6 are provided on the top cover 4, and a helium outlet valve 7 is provided at the outer end of the helium outlet 5.

[0050] The ingot is cast into a mold, and the ingot includes an ingot shell 8 and an ingot liquid core 9. The air gap 10 between the ingot shell 8 and the mold 1 is filled with... Figure 1 It can be seen that there is no adhesion. The subsequent dynamic adjustment method requires helium to be introduced from the bottom of the casting mold through helium inlet 2. The helium flows from the air gap at the bottom of the ingot to the top and flows out through helium outlet 5 at the top of the ingot.

[0051] The steps of dynamically adjusting the cooling flow rate and pressure of the introduced helium gas are combined with Figure 2 as follows:

[0052] S1. Establish a database of optimal helium cooling parameters based on the composition and microstructure of small-sized ingots.

[0053] S101. Melt the Inconel 718 alloy and pour the molten alloy into a φ250mm×600mm mold. At the same time, insert a high-temperature resistant thermocouple into the core of the ingot to monitor the temperature change of the core in real time.

[0054] S102. Helium gas is introduced from the bottom of the casting mold through helium inlet 2. The parameters of helium flow rate and helium pressure are adjusted by adjusting the preset values ​​of the opening of the helium inlet and outlet valves. The temperature change of the ingot core is continuously measured, and the cooling rate of the ingot corresponding to different helium flow rates and helium pressures is calculated. Based on step S101 and the temperature measurement results of the aforementioned small-sized ingot, the optimal helium parameters under different temperature conditions are determined, thereby obtaining the temperature measurement results of the small-sized ingot core.

[0055] S103. By conducting multiple orthogonal experiments on the temperature measurement of the small-sized ingot core in step S102, the helium flow rate and helium pressure corresponding to the fastest cooling rate of the casting alloy ingot center are obtained. These are used as the optimal helium cooling parameters for the alloy and stored in a computer to establish a database of optimal helium cooling parameters. The optimal helium cooling flow rate for Inconel 718 alloy is found to be 5 L / min, and the optimal helium pressure is 300 kPa.

[0056] S2. Based on the actual casting of large-size ingots, collect data on the ingot cooling helium flow rate and helium pressure in real time, and retrieve the optimal helium flow rate and optimal helium pressure data for ingots of this composition from the database in step S1.

[0057] S3. By performing online calculations on the data in step S2, the helium flow rate deviation value and the helium pressure deviation value are obtained; wherein: the helium flow rate deviation value is the difference between the real-time collected data of the helium flow rate for cooling the ingot and the data of the optimal helium flow rate for the ingot with this composition retrieved from the database; the helium pressure deviation value is the difference between the real-time collected data of the helium pressure for cooling the ingot and the data of the optimal helium pressure for the ingot with this composition retrieved from the database.

[0058] S4. Determine the helium flow rate deviation and helium pressure deviation values ​​from step S3, and adjust the actual helium cooling parameters according to the determination results to achieve dynamic control; wherein: when both the helium flow rate deviation and helium pressure deviation values ​​are zero, the current cooling helium flow rate and helium pressure are the optimal helium parameter values ​​for dynamic adjustment; when at least one of the helium flow rate deviation and helium pressure deviation values ​​is not zero, the preset values ​​of the opening degree of the helium inlet and outlet valves need to be adjusted until both the helium flow rate deviation and helium pressure deviation values ​​are zero;

[0059] When at least one of the helium flow rate deviation value and the helium pressure deviation value is not zero, the specific situation is as follows:

[0060] When the helium flow deviation value is positive, the current actual helium flow is large. The computer reduces the preset value of the helium inlet valve opening and quickly adjusts the helium flow until the optimal value.

[0061] If the helium flow deviation value is negative, the current actual helium flow is small. The computer increases the preset value of the helium inlet valve opening and increases the helium flow until it reaches the optimal value.

[0062] If the helium pressure deviation value is positive, the current actual helium pressure is relatively high. The computer increases the preset value of the helium outlet valve opening to reduce the helium pressure.

[0063] If the helium pressure deviation value is negative, the current actual helium pressure is low. The computer will reduce the preset value of the helium outlet valve opening and increase the helium pressure to the optimal pressure.

[0064] Figure 3 The simulation calculation shows that the temperature change of the ingot core in Example 1 with and without helium cooling is used to calculate the temperature change of the ingot core in Example 1. It can be seen that after using helium cooling, the temperature of the ingot core drops rapidly and the solidification process is significantly accelerated by 25%, thereby improving the solidification defects of the ingot.

[0065] In the above scheme, during the solidification process of the ingot, the present invention introduces helium gas at a certain pressure and flow rate into the air gap between the ingot and the metal mold, thereby changing the radiative heat transfer mode in the air gap to the conductive heat transfer mode, which greatly reduces the thermal resistance of the air gap, significantly improves the cooling rate of the ingot, accelerates the solidification process, shortens the solidification time, and improves the quality of the ingot core.

[0066] In this invention, the pressure and flow rate parameters of helium gas introduced into the air gap are determined based on the composition of the alloy in the ingot. By establishing a database of the optimal parameters of helium cooling flow rate and helium pressure for small-sized ingot alloys, the helium cooling flow rate and helium pressure are dynamically adjusted in real time to improve the solidification rate of the ingot.

[0067] This invention addresses the technical shortcomings of high-temperature annealing of large-sized ingots with low diffusion coefficients, such as manganese, chromium, and nickel, which result in long process cycles, high energy consumption, and low productivity. It employs a direct control cooling technique that dynamically adjusts the helium cooling flow rate and pressure in real time to achieve industrial-level dynamic control of the ingot solidification process.

[0068] During the solidification process of the ingot, an air gap is formed between the ingot and the mold due to thermal contraction. Helium gas is introduced into the bottom of the ingot and flows from the air gap at the bottom to the top, and then flows out through the helium outlet at the top of the ingot. By dynamically adjusting the cooling flow rate and pressure of the helium gas, the temperature change of the ingot core can be regulated, so that the microstructure of the cooled ingot is uniform and the degree of segregation is greatly reduced.

[0069] In summary, the dynamic control method for accelerating the solidification process of ingots of the present invention first establishes a database of optimal data on the process parameters of the pressure and flow rate of helium gas introduced into the air gap between the ingot and the metal mold. Then, the process parameters of the pressure and flow rate of helium gas introduced in real time are compared with the corresponding database data to obtain the deviation value of the helium cooling parameters. Based on the judgment result, the pressure and flow rate of helium gas introduced are adjusted.

[0070] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dynamic control method for accelerating the solidification process of ingot casting, characterized in that, The dynamic control method involves introducing helium gas into the air gap between the cast ingot and the casting mold for cooling, and dynamically adjusting the cooling flow rate and pressure of the helium gas in real time according to the cooling situation of the ingot core, so that the temperature of the ingot core drops rapidly, thereby accelerating the solidification process of the ingot and improving the internal quality of the ingot. The steps for dynamically adjusting the cooling flow rate and pressure of the introduced helium gas are as follows: S1. Establish a database of optimal helium cooling parameters based on the composition and microstructure of small-sized ingots; the specific steps are as follows: S101. Employ a small-size ingot solidification experiment method to continuously measure the temperature change of the ingot core. S102. Helium gas is introduced between the small-sized ingot and the cast iron mold. By adjusting the helium gas flow rate and helium gas pressure, the temperature change of the ingot core is continuously measured. Based on step S101 and the temperature measurement results of the aforementioned small-sized ingot, the optimal helium gas parameters under different temperature conditions are determined, thereby obtaining the temperature measurement results of the small-sized ingot core. S103. Based on the temperature measurement results of the small-sized ingot core in step S102, the helium flow rate and helium pressure corresponding to the fastest cooling rate in the ingot core at different temperatures are taken as the optimal helium cooling parameters, and they are stored in the computer to establish a database of the optimal helium cooling parameters for the ingot. S2. Based on the actual casting of large-size ingots, collect data on the ingot cooling helium flow rate and helium pressure in real time, and retrieve the optimal helium flow rate and optimal helium pressure data for ingots of this composition from the database in step S1. S3. Obtain the helium flow rate deviation value and helium pressure deviation value by performing online calculations on the data in step S2. S4. Determine the deviation values ​​of helium flow rate and helium pressure in step S3, and adjust the actual helium cooling parameters according to the determination results to achieve dynamic control. When both the helium flow rate deviation and the helium pressure deviation are zero, the current cooling helium flow rate and helium pressure are the optimal helium parameter values ​​for dynamic adjustment. When at least one of the helium flow rate deviation and the helium pressure deviation is not zero, the preset opening values ​​of the helium inlet and outlet valves need to be adjusted until both the helium flow rate deviation and the helium pressure deviation are zero.

2. The dynamic control method for accelerating the solidification process of ingots according to claim 1, characterized in that, The casting mold includes a mold shell; a helium inlet is provided at the bottom of the side wall of the mold shell, and a helium inlet valve is provided at the outer end of the helium inlet; a top cover is provided on the mold shell, and a helium outlet and a helium pressure gauge are provided on the top cover, and a helium outlet valve is provided at the outer end of the helium outlet.

3. The dynamic control method for accelerating the solidification process of ingots according to claim 1, characterized in that, The specific steps of step S101 are as follows: pouring the high-temperature alloy liquid into a small-sized ingot, inserting a thermocouple at the center of the ingot, and continuously measuring the temperature change of the ingot core by using the thermocouple readings.

4. The dynamic control method for accelerating the solidification process of ingots according to claim 1, characterized in that, The step S102 involves adjusting the helium flow rate and helium pressure by adjusting the preset values ​​of the opening of the helium inlet and outlet valves.

5. The dynamic control method for accelerating the solidification process of ingots according to claim 1, characterized in that, The specific steps of step S103 are as follows: a detailed comparison of the temperature measurement results of the small-sized ingot core in step S102 is performed. It is necessary to plot the continuous temperature change curves of the small-sized ingot core, find the continuous change curve corresponding to the temperature with the fastest cooling rate, and then find the helium flow rate and helium pressure corresponding to the continuous change curve, which are used as the optimal helium cooling parameters. After that, the parameters are stored in the computer and a database of the optimal helium cooling parameters for the ingot is established.

6. The dynamic control method for accelerating the solidification process of ingots according to claim 1, characterized in that, In step S3, the helium flow rate deviation is the difference between the real-time collected data of the helium flow rate for cooling the ingot and the data of the optimal helium flow rate for the ingot with this composition retrieved from the database, and the helium pressure deviation is the difference between the real-time collected data of the helium pressure for cooling the ingot and the data of the optimal helium pressure for the ingot with this composition retrieved from the database.

7. The dynamic control method for accelerating the solidification process of ingots according to claim 1, characterized in that, In step S4, when at least one of the helium flow rate deviation value and the helium pressure deviation value is not zero, the specific situation is as follows: When the helium flow deviation value is positive, the current actual helium flow is large. The computer reduces the preset value of the helium inlet valve opening and quickly adjusts the helium flow until the optimal value. If the helium flow deviation value is negative, the current actual helium flow is small. The computer increases the preset value of the helium inlet valve opening and increases the helium flow until it reaches the optimal value. If the helium pressure deviation value is positive, the current actual helium pressure is relatively high. The computer increases the preset value of the helium outlet valve opening to reduce the helium pressure. If the helium pressure deviation value is negative, the current actual helium pressure is low. The computer will reduce the preset value of the helium outlet valve opening and increase the helium pressure to the optimal pressure.

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