A control method for flexibly adjusting the cooling of a thermal processor and its experimental device

Abstract

The present invention provides a control method and an experimental device for flexibly adjusting the cooling of a heat processor. Aiming at the problem of the inductor cooling during the gradient induction heating of large billet workpieces, considering that the cooling differences of each section of the inductor are not significant, an experimental device is designed to flexibly change the cooling water flow rate of each section within the entire inductor range by adjusting the cooling water passage. The cooling pipes are fixed outside the inductor to solve the tooling problem of the inductor, reduce its thermal deformation, and lower the safety hazards during the production process. At the same time, dynamic and precise cooling control of the inductor in different regions is achieved, keeping the overall temperature of the inductor stable; when the inductor is energized, the stable temperature of the inductor keeps the current flow path in the inductor horizontal, reducing the occurrence of current bumps, generating a more reasonable magnetic field distribution, enabling the workpiece to generate a uniform temperature field, and thus improving the processing quality of the workpiece, solving the problem of uneven temperature of the inductor during the gradient induction heating of large billet workpieces.

Description

Technical Field

[0001] The present invention relates to the technical field of material hot processing, and in particular, to a control method for flexibly adjusting the cooling of a heat processor and an experimental device therefor. Background Art

[0002] During induction heating, the inductor is mostly made of copper pipe. When using a non-embedded scanning quenching process for a workpiece with a concave-convex geometric structure on the surface, due to the small gap between the inductor and the workpiece, the copper pipe of the inductor corresponding to this part is extremely prone to overheating and burning out under the thermal radiation of the heating surface and the constraint of limited dimensions in some parts, resulting in damage to the inductor. When the inductor enters and exits the end face of a large workpiece, the magnetic lines of force are concentrated, and the sudden change in the workpiece temperature will also cause the temperature of the induction coil to rise and fall significantly. At the same time, the physical properties of the inductor are affected by its own temperature, which in turn changes the magnetic field around the heated workpiece and affects the heating effect. To make the temperature of the inductor coil uniform, it is necessary to ensure that a cooling medium with sufficient flow rate and pressure passes through. To save costs, water at room temperature is used as the cooling medium in most cases. Within a certain range, the higher the flow rate of the cooling water, the more heat is carried away, so that the copper pipe achieves a better heat dissipation effect.

[0003] Currently, on the market, a method of allowing a cooling water path to flow through the entire inductor is often used for cooling. Within the entire inductor range, too low a cooling water flow rate cannot achieve a good heat dissipation effect, and too high a cooling water flow rate will cause excessive pressure inside the coil, which is not only likely to cause safety hazards but also increases production costs. Therefore, there is an urgent need for a control method and an experimental device that can change the cooling water flow rate in each section of the induction coil to achieve a uniform temperature distribution of the inductor, keep the current flow path in the inductor horizontal, generate a more reasonable magnetic field distribution, improve the service life of the inductor, and at the same time achieve a uniform temperature field distribution of the workpiece. Summary of the Invention

[0004] According to the above-mentioned technical problems, a control method for flexibly adjusting the cooling of a heat processor and an experimental device therefor are provided. The present invention divides the inductor used in electromagnetic heat treatment into several sections, and by flexibly controlling the cooling water flow rate inside each section of the inductor, the heat dissipation of each part of the inductor is adjusted, avoiding the situation of aggravated damage caused by the sudden change in the temperature of the whole inductor or a certain section due to the change of external parameters during the moving induction heating process.

[0005] The technical means adopted by the present invention are as follows:

[0006] A control method for flexibly adjusting the cooling of a heat processor includes:

[0007] Determine the inductor parameters, hot processing process parameters, and power supply parameters according to the workpiece parameters;

[0008] Based on the determined inductor parameters, hot working process parameters, and power supply parameters, the inductor is energized to perform electromagnetic induction heating on the workpiece, the temperature values of each section of the inductor are monitored, and the maximum and minimum temperature values of the measured inductor at this moment are obtained;

[0009] Limit the maximum temperature value of the measured inductor, and determine whether the obtained maximum temperature value of the measured inductor exceeds the allowable maximum temperature value of the inductor;

[0010] Based on the limited temperature value of the measured inductor and the minimum temperature value of the measured inductor, perform homogenization processing, and determine whether the minimum temperature value of the measured inductor exceeds the difference between the maximum temperature value of the measured inductor and the allowable temperature difference of the inductor;

[0011] Determine whether the inductor has reached the heating time. If the heating time has not been reached, the temperature sensor continues to monitor the temperature values of each section of the inductor and obtains the maximum and minimum temperature values of the measured inductor at this moment. If the heating time has been reached, end the operation and turn off the power supply.

[0012] Further, determining the inductor parameters, hot working process parameters, and power supply parameters according to the workpiece parameters includes: determining the inductor parameters, hot working process parameters, and power supply parameters according to the large billet workpiece parameters; specifically including:

[0013] Determine the physical parameters and geometric parameters of the workpiece: Let the length of the workpiece to be heated be L, and the target temperature of the heated workpiece be T w ;

[0014] Determine the physical parameters and geometric parameters of the inductor: Let the length of the inductor along the current flow path direction be l, the single - time effective heating width be h, the inductor moving speed be v, and the maximum stroke of the regulating piston inside the cooling pipe be d max Suppose initially d = 50% d max , the cross - sectional area of the cooling water flow is S;

[0015] Determine the hot working process parameters: Let the cooling water flow rate be V, the safe temperature of the inductor be T A , the allowable maximum temperature of the inductor be T max , the allowable temperature difference of the inductor be ΔT, the maximum temperature value of the measured inductor be T imax , the minimum temperature value of the measured inductor be T jmin , the heating time be t=(L + 2h) / v;

[0016] Determine the power supply parameters: Let the power supply frequency be P, and the current density be J.

[0017] Further, based on the determined inductor parameters, hot working process parameters, and power supply parameters, the inductor is energized to perform electromagnetic induction heating on the workpiece, the temperature values of each section of the inductor are monitored, and the maximum and minimum temperature values of the measured inductor at this moment are obtained, including:

[0018] The inductor is evenly divided into n sections along the direction of the current flow path, and temperature sensors respectively monitor the temperatures of the n sections of the inductor;

[0019] Find the maximum measured inductor temperature T imax =max{T1, T2, T3……T n} and the minimum measured inductor temperature T jmin =min{T1, T2, T3……T n} at this moment.

[0020] Further, the maximum temperature value of the measured inductor is limited, and it is judged whether the obtained maximum temperature value of the measured inductor exceeds the allowable maximum temperature of the inductor, including:

[0021] When the maximum temperature value T of the measured inductor imax exceeds the allowable maximum temperature T of the inductor max , continue to judge whether the maximum temperature value T of the measured inductor imax exceeds the safe temperature T of the inductor A . If the maximum temperature value T of the measured inductor imax exceeds the safe temperature T of the inductor A , then stop for maintenance. After the maintenance is completed, continue to monitor the temperature values of each section of the inductor; if the maximum temperature value T of the measured inductor imax does not exceed the safe temperature T of the inductor A , then calculate the difference ΔT imax between the maximum temperature value T of the measured inductor exceeding the allowable maximum temperature T of the inductor max . According to the required temperature difference reduction ΔT i , calculate the required increased cooling water flow rate ΔV i , control the pressure difference between the inlet and outlet to be constant, and then obtain the required increased cooling water flow area ΔS i for the i-th section of the inductor, and finally obtain the required feed amount Δd i of the adjusting piston for the i-th section of the inductor. After the adjusting piston feeds Δd i , continue to monitor the temperature values of each section of the inductor; i When the maximum temperature value T of the measured inductor

[0022] does not exceed the allowable maximum temperature T of the inductor imax , then judge the minimum temperature T of the measured inductor max ​jmin Whether the temperature exceeds the difference between the maximum value of the actual sensor temperature and the allowable sensor temperature difference T imax -ΔT.

[0023] Furthermore, the performing of the homogenization process based on the limited measured sensor temperature value and the measured sensor minimum temperature value, and determining whether the measured sensor minimum temperature value exceeds the difference between the measured sensor maximum temperature value and the allowable sensor temperature difference, includes:

[0024] When the minimum temperature of the sensor is measured, T jmin The difference between the maximum temperature of the actual sensor after the limit is not exceeded and the allowable sensor temperature difference T imax -ΔT, then calculate the minimum temperature T of the measured sensor jmin Lower than T imax -T difference ΔT j , according to the required increase in temperature difference ΔT j , calculate the cooling water flow rate ΔV that needs to be slowed down j , control the pressure difference between the water inlet and outlet to be constant, and then obtain the cooling water flow area ΔS that needs to be reduced for the j-th sensor j Finally, the required retreat amount Δd of the regulating piston in the jth section is obtained j , adjust the piston back Δd i After that, continue to monitor the temperature values of each section of the sensor;

[0025] When the minimum temperature of the sensor is measured, T jmin The difference between the maximum temperature of the actual sensor after exceeding the limit and the allowable sensor temperature difference T imax -ΔT, it is determined whether the sensor has reached the heating time.

[0026] Furthermore, the sensor safety temperature T A According to the workpiece target temperature T w Set the range to T A =0.8~1.0T w ; The cooling water flow area S is the minimum cross-sectional area of the regulating piston and the sensor.

[0027] The present invention also provides an experimental device for flexibly adjusting the cooling of a heat processor based on the control method for flexibly adjusting the cooling of a heat processor, comprising: a sensor, a water inlet pipe, an upper water pipe, a connecting pipe, a pressure pump, an upper water inlet pipe, a cooling pipe, a lower water outlet pipe, an adjusting piston, and a temperature sensor, wherein:

[0028] A temperature sensor is arranged inside the inductor, and a cooling pipe is arranged outside the inductor. The lower part of the inductor and the cooling pipe is bonded with a lower water outlet pipe through high-temperature refractory glue. The upper part of the inductor and the cooling pipe is bonded with an upper water inlet pipe through high-temperature refractory glue. A pressure pump is arranged outside the upper water inlet pipe. The other end of the pressure pump is welded with an upper water pipe through a connecting pipe. The upper part of the upper water pipe is welded with a water inlet pipe. Adjusting pistons are arranged in sequence inside the piston holes around the cooling pipe. The cooling pipe includes a water inlet, a piston port, a water outlet, and a plate check valve. The plate check valve is hinged under the cooling pipe to prevent the cooling water from flowing back.

[0029] Further, the cooling water of the inductor flows from top to bottom, and the inlet pressure is adjusted through the pressure pump to ensure a constant pressure difference between the inlet and outlet of each section.

[0030] Further, the upper water inlet pipe is divided into n independent pipes, and forms independent pipelines with the corresponding pressure pumps and the cooling pipe.

[0031] Further, the upper water inlet pipe, the cooling pipe, the lower water outlet pipe, the adjusting piston, and the plate check valve are all made of insulating materials. The adjusting piston moves back and forth in the piston hole, and its shape, size, and quantity are determined by the shape of the inductor and the parameters to be processed.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] 1. The present invention aims at the problem of inductor cooling during the gradient induction heating of large billets. Considering that the cooling of each section of the inductor is not very different, an experimental device is designed with a set of cooling water paths to flexibly change the cooling water flow rate of each section within the entire inductor range. It fixes the cooling pipe outside the inductor, solves the tooling problem of the inductor, reduces its thermal deformation, and the present invention saves water resources and reduces the potential safety hazards during the production process.

[0034] 2. The present invention realizes the dynamic and precise cooling control of the inductor in different regions, keeping the overall temperature of the inductor stable. When the inductor is electrified, the stable temperature of the inductor keeps the current flow path in the inductor horizontal, reduces the occurrence of current bump problems, generates a more reasonable magnetic field distribution, makes the workpiece generate a uniform temperature field, and further improves the processing quality of the workpiece, solving the problem of uneven temperature of the inductor during the gradient induction heating of large billet workpieces.

[0035] 3. The present invention cleverly divides the inductor into n parts along the length direction according to the shape of the inductor and the parameters to be processed. The cooling water flows independently in each section of the inductor. Under the monitoring of the temperature sensor, the forward and backward movement of the adjusting piston is calculated and adjusted. By adjusting the flow area of the cooling water, the flow rate of the cooling water in each section of the inductor is changed, so as to flexibly control the temperature of each section of the inductor, realize the uniform temperature within the whole inductor range, not only make the physical performance of the inductor stable, but also improve the service life of the inductor.

[0036] Based on the above reasons, the present invention can be widely promoted in the fields of material hot processing and the like. Brief Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0038] Figure 1 It is the process flow chart of the method of the present invention.

[0039] Figure 2 It is the overall structure schematic diagram of the experimental device of the present invention.

[0040] Figure 3 It is the assembly drawing of the upper water inlet system provided by the embodiment of the present invention.

[0041] Figure 4 It is the structure diagram of the induction coil and the cooling pipeline provided by the embodiment of the present invention.

[0042] Figure 5 It is the schematic diagram of the water inlet and outlet cross section provided by the embodiment of the present invention.

[0043] Figure 6 It is a schematic diagram of an adjusting piston provided by the embodiment of the present invention.

[0044] Figure 7 It is another schematic diagram of an adjusting piston provided by the embodiment of the present invention.

[0045] In the figure: 1. Inductor; 2. Water inlet pipe; 3. Upper water pipe; 4. Connecting pipe; 5. Pressure pump; 6. Upper water inlet; 7. Cooling pipeline; 701. Upper water inlet; 702. Piston port; 703. Water outlet; 704. Plate check valve; 8. Adjusting piston; 9. Lower water outlet pipe; 10. Temperature sensor. Detailed Embodiments

[0046] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0048] As Figure 1 shown, the present invention provides a control method for flexibly adjusting the cooling of a heat processor, including:

[0049] S1. Determine the inductor parameters, hot working process parameters, and power supply parameters according to the workpiece parameters;

[0050] In this embodiment, the inductor parameters, hot working process parameters, and power supply parameters are determined according to the workpiece parameters of the large billet workpiece; specifically including:

[0051] S11. Determine the physical parameters and geometric parameters of the workpiece: Let the length of the workpiece to be heated be L, and the target temperature of the heated workpiece be T w ;

[0052] S12. Determine the physical parameters and geometric parameters of the inductor: Let the length of the inductor along the current flow path direction be l, the effective heating width be h, the moving speed of the inductor be v, the maximum stroke of the regulating piston inside the cooling pipe be d max , let d = 50% d initially max , and the cross-sectional area of the cooling water flow be S;

[0053] S13. Determine the hot working process parameters: Let the cooling water flow rate be V, the safe temperature of the inductor be T A , the maximum allowable temperature of the inductor be T max , the allowable temperature difference of the inductor be ΔT, and the measured maximum temperature of the inductor be T imax, the minimum temperature of the measured inductor is T jmin , the heating time is t = (L + 2h) / v;

[0054] S14. Determine the power supply parameters: Let the power supply frequency be P and the current density be J.

[0055] S2. Based on the determined inductor parameters, hot processing process parameters and power supply parameters, monitor the temperature values of each section of the inductor, and obtain the maximum and minimum temperatures of the measured inductor at this moment;

[0056] In this embodiment, the step S2 specifically includes:

[0057] S21. Divide the inductor into n sections evenly along the current flow path direction, and the temperature sensors monitor the temperatures of the n sections of the inductor respectively;

[0058] S22. Find the maximum temperature T imax = max{T1, T2, T3... T n} and the minimum temperature T jmin = min{T1, T2, T3... T n} of the measured inductor at this moment.

[0059] S3. Limit the maximum temperature of the measured inductor, and judge whether the obtained maximum temperature of the measured inductor exceeds the allowable maximum temperature of the inductor;

[0060] In this embodiment, the step S3 specifically includes:

[0061] S31. When the maximum temperature T imax of the measured inductor exceeds the allowable maximum temperature T max of the inductor, continue to judge whether the maximum temperature T imax of the measured inductor exceeds the safe temperature T A of the inductor. If the maximum temperature T imax of the measured inductor exceeds the safe temperature T A of the inductor, then stop for maintenance. After the maintenance is completed, continue to monitor the temperature values of each section of the inductor; if the maximum temperature T imax of the measured inductor does not exceed the safe temperature T A of the inductor, then calculate the difference ΔT imax by which the maximum temperature T max of the measured inductor exceeds the allowable maximum temperature T i of the inductor. According to the required temperature difference reduction ΔT i , calculate the required cooling water flow rate reduction ΔV i , control the pressure difference between the water inlet and the water outlet to be constant, and then obtain the required reduction in the cooling water flow area ΔS of the i-th section of the inductori , finally obtain the required feed Δd of the adjusting piston of the i-th section of the inductor i , the adjusting piston feeds Δd i After that, go to step S2 to continue monitoring the temperature values of each section of the inductor;

[0062] S32. When the maximum measured temperature T of the inductor imax does not exceed the maximum allowable temperature T of the inductor max , then go to step S4 to determine whether the minimum measured temperature T of the inductor jmin exceeds the difference T imax -ΔT between the maximum measured temperature of the inductor and the allowable temperature difference of the inductor.

[0063] S4. Based on the limited measured temperature value of the inductor and the minimum measured temperature of the inductor, perform homogenization processing, and determine whether the minimum measured temperature of the inductor exceeds the difference between the maximum measured temperature of the inductor and the allowable temperature difference of the inductor;

[0064] In this embodiment, the step S4 specifically includes:

[0065] S41. When the minimum measured temperature T of the inductor jmin does not exceed the difference T imax -ΔT between the limited maximum measured temperature of the inductor and the allowable temperature difference of the inductor, then calculate the difference ΔT jmin by which the minimum measured temperature T of the inductor is lower than T imax , calculate the cooling water flow rate ΔV that needs to be slowed down according to the required increased temperature difference ΔT j , keep the pressure difference between the water inlet and the water outlet constant, and then obtain the reduced cooling water flow area ΔS of the j-th section of the inductor j , finally obtain the required retraction amount Δd of the j-th section of the adjusting piston j , the adjusting piston retracts Δd j , then go to step S2 to continue monitoring the temperature values of each section of the inductor; j , the adjusting piston retracts Δd i After that, go to step S2 to continue monitoring the temperature values of each section of the inductor;

[0066] S42. When the minimum measured temperature T of the inductor jmin exceeds the difference T imax -ΔT between the limited maximum measured temperature of the inductor and the allowable temperature difference of the inductor, then go to step S5 to determine whether the inductor has reached the heating time.

[0067] S5. Determine whether the inductor has reached the heating time. If it has not reached the heating time, the temperature sensor continues to monitor the temperature values of each section of the inductor and obtain the maximum and minimum measured temperatures of the inductor at this moment. If it has reached the heating time, end the operation and turn off the power supply.

[0068] In specific implementation, as a preferred implementation manner of the present invention, the safe temperature T of the inductor A is set according to the target temperature T of the workpiece w , and the setting range is T A = 0.8 - 1.0T w ; The reason for setting the safe temperature T A is as follows: The gap between the inductor and the workpiece is usually 0.5 - 1 mm. When the assembly accuracy is insufficient, it is easy to cause the inductor to come into contact with the high-temperature workpiece, resulting in a rapid rise in the inductor temperature and burnout; the above situation will also occur when the parameters are selected incorrectly. Therefore, the safe temperature T A is set. When the coil temperature is abnormal and exceeds the safe temperature T A , the power supply is immediately stopped, the assembly and parameter settings are inspected, and then the device is restarted.

[0069] In specific implementation, as a preferred implementation manner of the present invention, the cross-sectional area S of the cooling water flow is the minimum cross-sectional area of the adjusting piston and the inductor.

[0070] As Figures 2 - 5 shown, the present invention provides an experimental device for flexibly adjusting the cooling of a heat processor based on the above-mentioned control method for flexibly adjusting the cooling of a heat processor, including: an inductor 1, a water inlet pipe 2, an upper water pipe 3, a connecting pipe 4, a pressure pump 5, an upper water inlet pipe 6, a cooling pipe 7, a lower water outlet pipe 9, an adjusting piston 8, a temperature sensor 10, where:

[0071] A temperature sensor 10 is arranged inside the inductor 1, a cooling pipe 7 is arranged outside the inductor 1, the lower part of the inductor 1 and the cooling pipe 7 is bonded to the lower water outlet pipe 9 through high-temperature refractory glue, the upper part of the inductor 1 and the cooling pipe 7 is bonded to the upper water inlet pipe 2 through high-temperature refractory glue, a pressure pump 5 is arranged outside the upper water inlet pipe 2, the other end of the pressure pump 5 is welded to the upper water pipe 3 through a connecting pipe, the upper part of the upper water pipe 3 is welded to the water inlet pipe 2, and the adjusting pistons 8 are arranged in sequence inside the piston holes around the cooling pipe 7; The cooling pipe 7 includes a water inlet 701, a piston port 702, a water outlet 703, and a plate check valve 704. The plate check valve 704 is hinged below the cooling pipe 7 to prevent the cooling water from flowing back.

[0072] In specific implementation, as a preferred implementation manner of the present invention, the upper water inlet pipe 6 is divided into n independent pipes and forms independent pipelines with the corresponding pressure pumps 5 and the cooling pipe 7.

[0073] In specific implementation, as a preferred implementation manner of the present invention, the upper water inlet pipe 6, the cooling pipe 7, the lower water outlet pipe 9, the adjusting piston 8, and the plate check valve 704 are all made of insulating materials, such as Figure 6As shown, the adjusting piston 8 moves back and forth within the piston hole, and its shape and size are determined by the shape of the inductor 1 and the parameters to be processed. The cross-section of the adjusting piston 8 is arc-shaped, which can reduce the impact generated when the cooling water flows in from the water inlet 701 and out from the water outlet 703.

[0074] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for flexibly adjusting the cooling of a thermal processor, characterized in that, Including: Determine the inductor parameters, hot working process parameters, and power supply parameters according to the workpiece parameters; Based on the determined inductor parameters, hot working process parameters, and power supply parameters, energize the inductor to perform electromagnetic induction heating on the workpiece, monitor the temperature values of each section of the inductor, and obtain the maximum and minimum temperature values of the measured inductor at this moment; Including: Divide the inductor evenly into n segments along the direction of the current flow path, and the temperature sensors respectively monitor the temperatures of the n segments of the inductor; find the maximum measured temperature T of the inductor at this moment imax = max{T1, T2, T3... T n} and the minimum measured temperature T of the inductor at this moment jmin = min{T1, T2, T3... T n}; Limit the maximum temperature value of the measured inductor, and judge whether the obtained maximum temperature value of the measured inductor exceeds the allowable maximum temperature value of the inductor; Based on the limited maximum temperature value of the measured inductor and the minimum temperature value of the measured inductor, perform homogenization processing, and judge whether the minimum temperature value of the measured inductor exceeds the difference between the maximum temperature value of the measured inductor and the allowable temperature difference of the inductor; The cooling water flows independently in each section of the inductor. Under the monitoring of the temperature sensor, calculate and adjust the forward and backward movement of the regulating piston, change the flow rate of the cooling water in each section of the inductor by adjusting the flow area of the cooling water, control the temperature of each section of the inductor, and achieve uniform temperature within the entire inductor range; Judge whether the inductor has reached the heating time. If it has not reached the heating time, the temperature sensor continues to monitor the temperature values of each section of the inductor and obtain the maximum and minimum temperature values of the measured inductor at this moment. If it has reached the heating time, end the operation and turn off the power supply.

2. The control method for flexibly adjusting the cooling of a thermal processor according to claim 1, wherein The step of determining the inductor parameters, hot working process parameters, and power supply parameters according to the workpiece parameters includes: determining the inductor parameters, hot working process parameters, and power supply parameters according to the large billet workpiece parameters; specifically including: Determine the physical and geometric parameters of the workpiece: Assume that the length of the workpiece to be heated is L, and the target temperature for heating the workpiece is T w ; Determine the physical and geometric parameters of the inductor: Let the length of the inductor along the current flow path be l, the single effective heating width be h, the moving speed of the inductor be v, and the maximum stroke of the regulating piston inside the cooling pipe be d max , and let d = 50% d initially max , the cross-sectional area of the cooling water flow S; Determine the hot processing process parameters: Set the cooling water flow rate V, and the safe temperature of the inductor is T A , and the maximum allowable temperature of the inductor is T max , the allowable temperature difference of the inductor is ΔT, and the measured maximum temperature of the inductor is T imax , the measured minimum temperature of the inductor is T jmin , and the heating time is t = (L + 2h) / v; Determine the power supply parameters: set the power supply frequency as P and the current density as J.

3. The control method for flexibly adjusting the cooling of a thermal processor according to claim 2, characterized in that The step of limiting the maximum temperature value of the measured inductor and judging whether the obtained maximum temperature value of the measured inductor exceeds the allowable maximum temperature value of the inductor includes: When the maximum temperature T of the measured inductor imax exceeds the maximum allowable temperature T of the inductor max , continue to determine whether the maximum temperature T of the measured inductor imax exceeds the safe temperature T of the inductor A . If the maximum temperature T of the measured inductor imax exceeds the safe temperature T of the inductor A , stop for maintenance. After the maintenance is completed, continue to monitor the temperature values of each section of the inductor; if the maximum temperature T of the measured inductor imax does not exceed the safe temperature T of the inductor A , then calculate the difference ΔT imax by which the maximum temperature T of the measured inductor exceeds the maximum allowable temperature T of the inductor max . According to the temperature difference ΔT i that needs to be reduced i , calculate the increased cooling water flow rate ΔV i , control the pressure difference between the inlet and outlet to be constant, and then obtain the increased cooling water flow area ΔS i required for the i-th section of the inductor, and finally obtain the required feed amount Δd i of the adjustment piston for the i-th section of the inductor. After the adjustment piston feeds by Δd i , continue to monitor the temperature values of each section of the inductor; When the maximum temperature T of the measured sensor imax does not exceed the maximum temperature T of the permitted sensor max , then it is judged whether the minimum temperature T of the measured sensor jmin exceeds the difference value T imax -ΔT between the maximum temperature of the measured sensor and the temperature difference of the permitted sensor.

4. The control method for flexibly adjusting the cooling of a thermal processor according to claim 2, characterized in that, The step of performing homogenization processing based on the limited measured inductor temperature value and the minimum temperature value of the measured inductor, and judging whether the minimum temperature value of the measured inductor exceeds the difference between the maximum temperature value of the measured inductor and the allowable inductor temperature difference includes: When the minimum temperature of the sensor is measured, T jmin The difference between the maximum temperature of the actual sensor after the limit is not exceeded and the allowable sensor temperature difference T imax -ΔT, then calculate the minimum temperature T of the measured sensor jmin Lower than T imax -T difference ΔT j , according to the required increase in temperature difference ΔT j , calculate the cooling water flow rate ΔV that needs to be slowed down j , control the pressure difference between the water inlet and outlet to be constant, and then obtain the cooling water flow area ΔS that needs to be reduced for the j-th sensor j Finally, the required retreat amount Δd of the regulating piston in the jth section is obtained j , adjust the piston back Δd j After that, continue to monitor the temperature values of each section of the sensor; When the minimum temperature T of the measured inductor jmin exceeds the difference T between the maximum temperature of the measured inductor after exceeding the limit and the allowable temperature difference of the inductor imax -ΔT, it is determined whether the inductor has reached the heating time.

5. The control method for flexibly adjusting the cooling of a thermal processor according to claim 2, wherein, The safe temperature T of the inductor A is set according to the target temperature T of the workpiece w , and the setting range is T A = 0.8 to 1.0T w ; the over-flow area S of the cooling water is the minimum cross-sectional area of the adjusting piston and the inductor.

6. An experimental device for flexibly adjusting the cooling of a thermal processor based on the control method for flexibly adjusting the cooling of a thermal processor according to claim 1, characterized in that, Including: Inductor, inlet pipe, upper water pipe, connecting pipe, pressure pump, upper inlet pipe, cooling pipe, lower outlet pipe, regulating piston, temperature sensor, where: A temperature sensor is arranged inside the inductor, a cooling pipe is arranged outside the inductor, the lower part of the inductor and the cooling pipe is bonded with a lower outlet pipe through high-temperature refractory glue, the upper part of the inductor and the cooling pipe is bonded with an upper inlet pipe through high-temperature refractory glue, a pressure pump is arranged outside the upper inlet pipe, the other end of the pressure pump is welded with an upper water pipe through a connecting pipe, the upper part of the upper water pipe is welded with an inlet pipe, and the regulating pistons are arranged in sequence inside the piston holes around the cooling pipe; the cooling pipe includes a water inlet, a piston port, a water outlet, and a plate check valve. The plate check valve is hinged at the lower part of the cooling pipe to prevent the cooling water from flowing back.

7. The experimental device for flexibly adjusting the cooling of a thermal processor according to claim 6, characterized in that, The cooling water of the inductor flows from top to bottom, and the inlet pressure is adjusted by the pressure pump to ensure that the pressure difference between the inlet and outlet of each section is constant.

8. The experimental device for flexibly adjusting the cooling of a thermal processor according to claim 6, characterized in that, The upper inlet pipe is divided into n independent pipes and forms independent pipelines with the corresponding pressure pumps and the cooling pipe.

9. The experimental device for flexibly adjusting the cooling of a thermal processor according to claim 6, characterized in that, The upper water inlet pipe, the cooling pipe, the lower water outlet pipe, the regulating piston, and the plate check valve are all made of insulating materials.

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