Split structure high-strength aluminum alloy hub integrated die forging forming combined die structure

Abstract

The invention belongs to the technical field of hub forging, and relates to a split structure high-strength aluminum alloy hub integrated die forging forming combined die structure which comprises a machining table and a die unit arranged on the machining table. The die unit is composed of an upper die, a lower die and a side die, and a composite cooling module is arranged in the upper die and corresponds to the thick and large portion of the hub. The composite cooling module comprises a passive heat storage unit and an active cooling unit, a phase change material is arranged in the passive heat storage unit, and the active cooling unit is provided with an independent cooling flow channel. The intelligent temperature control system comprises a first temperature sensor and a second temperature sensor which are arranged at different positions of the mold, and a controller connected with the sensors. During working, the phase change material firstly absorbs heat to delay solidification, and the controller starts forced cooling after latent heat is exhausted. The system monitors the overall temperature difference in real time, and it is ensured that the cooling process is conducted within a safe range. The method can effectively eliminate the shrinkage cavity defect, reduce casting deformation and improve the product quality and the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wheel hub forging, in particular to a split structure high-strength aluminum alloy wheel hub integrated die forging forming combined die structure. BACKGROUND

[0002] The wheel hub casting die is a large, complex, high-precision hot working die. Its core function is to shape the molten liquid metal under pressure, and after cooling, obtain a wheel hub blank with specific shape, size and mechanical properties.

[0003] The automobile wheel hub casting die structure generally has the problem of uneven cooling, especially in thick and large parts, due to slow heat dissipation, often the last solidification, prone to shrinkage, porosity and other defects. The existing die mostly adopts external air cooling or simple water cooling channel, the cooling path design is unreasonable, and the differential cooling of different parts cannot be realized. When the thick and large parts are still in liquid state, the thin-walled parts have already solidified. This asynchronous solidification not only leads to internal defects, but also produces thermal stress, causing deformation of the casting, which seriously affects the quality and production efficiency of the wheel hub casting.

[0004] Therefore, we propose a split structure high-strength aluminum alloy wheel hub integrated die forging forming combined die structure. SUMMARY

[0005] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0006] A split structure high-strength aluminum alloy wheel hub integrated die forging forming combined die structure, comprising a machining table, a die unit is provided on the machining table, the die unit comprises an upper die, a lower die and a side die, at least one composite cooling module is arranged inside the upper die, the composite cooling module is arranged corresponding to the thick and large parts of the wheel hub casting, and the composite cooling module is integrated with an active cooling unit and a passive heat storage unit inside; the die further comprises an intelligent temperature control system for cooperatively controlling the cooling behavior of each composite cooling module.

[0007] Preferably, the passive heat storage unit comprises a cavity, the cavity is opened in the upper die corresponding to the thick and large parts of the wheel hub casting, the cavity is packaged with PCM phase change material, the phase change temperature Tr of the PCM phase change material is higher than the solidus temperature of the wheel hub alloy, an injection channel for replacing the phase change material is arranged on the cavity, the injection channel is opened in the upper die, and the injection channel is blocked and sealed by a sealing column.

[0008] Preferably, the active cooling unit is a cooling flow channel opened inside the composite cooling module and penetrating through the cavity, the cooling flow channel is provided with an independent cooling medium inlet and outlet and a flow regulating valve, the cooling medium inlet and the main flow channel are in communication, the main flow channel is opened in the middle of the upper die, the outlet and the collecting pipe are fixedly communicated to form a circulating cooling passage, and the inlet, the outlet, the flow regulating valve and the collecting pipe are all arranged inside the upper die.

[0009] Preferably, the intelligent temperature control system comprises:

[0010] A plurality of first temperature sensors are arranged in one-to-one correspondence inside the composite cooling module or in the upper die region adjacent to the composite cooling module, for monitoring the local real-time temperature of the corresponding thick and large parts and the phase change state of the PCM.

[0011] A plurality of second temperature sensors are arranged in the upper die corresponding to the non-thick and large cooling area of the hub casting and the base part, for monitoring the temperature field and cooling process of the whole mold.

[0012] A controller is fixedly connected to the upper end face of the upper die and electrically connected to all the first temperature sensors, the second temperature sensors and the flow regulating valves.

[0013] Preferably, the controller is configured to receive the signals of the first temperature sensors and independently control the opening and closing and opening degree of the corresponding flow regulating valves based on the phase change state of the PCM monitored thereby, so as to trigger or adjust the active cooling intensity of the corresponding thick and large parts.

[0014] Preferably, the controller is configured to determine that the PCM phase change material is in the phase change period when the first temperature sensors monitor that the temperature reaches and maintains the phase change temperature Tr of the PCM phase change material for a predetermined time t1, and determine that the latent heat of the PCM phase change material is exhausted when the temperature starts to rise from Tr, and instruct to increase the opening degree of the corresponding flow regulating valve to implement quenching.

[0015] Preferably, the controller is further configured to receive and process the signals of the second temperature sensors to calculate the overall temperature difference of the mold and execute a global safety strategy based on the analysis result.

[0016] Preferably, the controller executing the global safety strategy comprises:

[0017] After generating the quenching instruction according to the signals of the first temperature sensors and before executing the instruction, the real-time global temperature difference data calculated by the second temperature sensors is first verified;

[0018] When the real-time global temperature difference exceeds a predetermined safety threshold, the quenching instruction is prohibited from being executed.

[0019] When the real-time global temperature difference does not exceed the preset safety threshold, the chilling instruction is allowed to be executed.

[0020] Preferably, the controller is further configured to determine the overall cooling stage of the mold according to the signal of the second temperature sensor, and to coordinate the start and end of the cooling process of all the composite cooling modules accordingly.

[0021] Preferably, the controller is further configured to cross-compare the data of each first temperature sensor and the second temperature sensor; when the deviation of the data of a single first temperature sensor from the overall trend reflected by the second temperature sensor exceeds a preset tolerance range, it is determined that the first temperature sensor fails and an alarm is triggered.

[0022] Advantages of the present application:

[0023] The present application realizes precise temperature control of the wheel hub casting process through the synergistic effect of the composite cooling module and the intelligent temperature control system. The phase change material absorbs a large amount of heat at the initial solidification stage, delaying the solidification speed of the thick and large parts, creating favorable conditions for metal liquid feeding. After the latent heat is exhausted, the system immediately starts forced cooling, making the part quickly pass through the paste zone, effectively eliminating shrinkage defects. The dual-temperature sensor layout monitors the local and overall temperature in real time, and the controller dynamically adjusts the cooling intensity according to the temperature difference change, ensuring the compactness of the internal organization of the casting and avoiding the problem of thermal cracking caused by too fast cooling. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0025] Among them:

[0026] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0027] Figure 2 It is Figure 1 It is an enlarged schematic diagram of the structure at A in the figure;

[0028] Figure 3 It is a schematic diagram of the connection structure of the demolding unit;

[0029] Figure 4 It is a schematic diagram of the connection structure of the passive heat storage unit;

[0030] Figure 5Figure 4 Enlarged schematic view of the structure at B;

[0031] Figure 6 Schematic view of the connecting structure of the composite cooling module and the upper die;

[0032] Figure 7 Schematic view of the connecting structure of the composite cooling module and the upper die; Figure 6 Enlarged schematic view of the structure at C;

[0033] Figure 8 Schematic view of the connecting structure of the second sensor and the upper die;

[0034] Figure 9 Schematic view of the connecting structure of the composite cooling module and the upper die; Figure 8 Enlarged schematic view of the structure at D.

[0035] In the figure:

[0036] 1, processing table;

[0037] 2, die unit; 21, side die; 22, lower die; 23, side cylinder; 24, upper die; 25, upper cylinder;

[0038] 3, composite cooling module; 31, passive heat storage unit; 311, cavity; 312, filling channel; 313, sealing column; 32, active cooling unit; 321, cooling flow channel; 322, flow regulating valve; 323, main flow channel; 324, outlet; 325, manifold; 326, inlet;

[0039] 4, demolding unit; 41, ejector rod; 42, electric telescopic rod;

[0040] 5, intelligent temperature control system; 51, first temperature sensor; 52, second temperature sensor;

[0041] 6, controller; 7, injection system. DETAILED DESCRIPTION

[0042] In order to make the inventive purposes, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] Embodiment:

[0044] In this embodiment, a cast aluminum alloy sports hub is taken as an example, and the solidus temperature of the alloy is about 555℃, and the liquidus temperature is about 615℃.

[0045] As Figures 1-9 As shown in the figure, a split structure high-strength aluminum alloy wheel hub integrated die forging forming combined die structure, including processing platform 1, processing platform 1 is provided with die unit 2, die unit 2 includes upper die 24, lower die 22 and side die 21, at least one composite cooling module 3 is arranged inside upper die 24, composite cooling module 3 is arranged corresponding to thick part of wheel hub casting, and active cooling unit 32 and passive heat storage unit 31 are integrated inside composite cooling module 3; the die also includes intelligent temperature control system 5, which is used for cooperative control of cooling behavior of each composite cooling module 3; the die includes a solid processing platform 1. The processing platform 1 is provided with the die unit 2, and the die unit 2 includes the upper die 24 driven by the upper cylinder 25, the lower die 22 and the side die 21 driven by the side cylinder 23. The core innovation of the design is that, inside the upper die 24, nine composite cooling modules 3 are arranged corresponding to thick parts of the wheel hub. Each composite cooling module 3 integrates a passive heat storage unit 31 and an active cooling unit 32 inside. The die is also equipped with an intelligent temperature control system 5 for unified command and cooperation of the work of the nine composite cooling modules 3, realizing precise targeted management of the hot spot parts of the wheel hub.

[0046] Further, the passive heat storage unit 31 includes a cavity 311, the cavity 311 is opened in the upper die 24 corresponding to the thick part of the wheel hub casting, the cavity 311 encapsulates the PCM phase change material, the phase change temperature Tr of the PCM phase change material is higher than the solidus temperature of the wheel hub alloy, and the cavity 311 is provided with a filling channel 312 for replacing the phase change material, the filling channel 312 is opened in the upper die 24, and the filling channel 312 is blocked and sealed by the sealing column 313; the passive heat storage unit 31 includes a cavity 311, the cavity 311 is processed from heat-resistant die steel and is directly opened in the upper die 24, and the position is opposite to the thick node of the wheel hub casting. The cavity 311 encapsulates the metal-based PCM phase change material with a phase change temperature Tr of 580 DEG C, which is higher than the solidus temperature (555 DEG C) of A356 aluminum alloy. In order to facilitate the replacement of PCM after performance attenuation (or the replacement of corresponding PCM phase change material when other metal materials are processed), a filling channel 312 is also processed in the upper die 24, which directly penetrates the cavity 311 from the outer surface of the die. In daily work, the filling channel 312 is blocked and sealed by a high-temperature-resistant sealing column 313 in interference fit. The PCM material absorbs a large amount of latent heat during the phase change process, and the temperature basically remains unchanged, which provides a powerful "thermal buffer" effect for the thick part, significantly slows down the solidification speed of the region, creates a valuable time window for the metal liquid to fully compensate before solidification, and reduces the shrinkage tendency from the root. The replaceable design greatly improves the maintainability and economy of the die.

[0047] Further, the active cooling unit 32 is a cooling flow channel 321 opened in the composite cooling module 3 and penetrating the cavity 311. The cooling flow channel 321 is provided with an independent cooling medium inlet 326 and outlet 324 and a flow regulating valve 322. The cooling medium inlet 326 is in communication with the main flow channel 323, which is opened in the middle of the upper die 24. The outlet 324 is fixedly communicated with the collecting pipe 325 to form a circulating cooling passage. The inlet 326, the outlet 324, the flow regulating valve 322 and the collecting pipe 325 are all arranged in the upper die 24. The active cooling unit 32 is a cooling flow channel 321 penetrating the cavity 311. The cooling flow channel 321 has an independent cooling medium inlet 326 and outlet 324. A high-frequency response electromagnetic flow regulating valve 322 is installed at the inlet 326 for accurately controlling the flow of the cooling oil. The cooling medium inlet 326 is in communication with a main flow channel 323 processed in the upper die 24. The main flow channel 323 is connected with an external cooling oil supply system. The cooling medium outlet 324 is fixedly communicated with a collecting pipe 325. The cooling oil finally flows back to the external cooling system through the collecting pipe 325, thereby forming a complete and independent circulating cooling passage.

[0048] Further, the intelligent temperature control system 5 comprises:

[0049] A plurality of first temperature sensors 51 are arranged one by one in the upper die 24 region adjacent to the composite cooling module 3 or in the composite cooling module 3, for monitoring the local real-time temperature of the corresponding thick and large parts and the phase change state of the PCM.

[0050] A plurality of second temperature sensors 52 are arranged in the upper die 24 corresponding to the non-thick and large cooling area of the hub casting and the base part, for monitoring the temperature field and cooling process of the whole mold.

[0051] A controller 6 is fixedly connected to the upper end surface of the upper die 24 and electrically connected with all the first temperature sensors 51, the second temperature sensors 52 and the flow regulating valves 322.

[0052] The intelligent temperature control system 5 comprises a plurality of sensors and a controller 6. Nine first temperature sensors 51 are embedded one by one around the cavities 311 of the nine composite cooling modules 3 for directly monitoring the local real-time temperature of the corresponding thick and large nodular regions. The temperature data is used to represent the phase change state of the PCM. Nine second temperature sensors 52 are arranged in the upper die 24 corresponding to the base part of the hub thin-walled area for monitoring the distribution of the whole mold temperature field and the cooling process. The controller 6 adopts an industrial PLC, which is fixedly installed on the upper end surface of the upper die 24 and electrically connected with all the first temperature sensors 51, the second temperature sensors 52 and the flow regulating valves 322 through high-temperature resistant cables.

[0053] Further, the controller 6 is configured to receive the signals of the first temperature sensors 51 and independently control the opening and closing and the opening degree of the corresponding flow regulating valves 322 based on the phase change state of the PCM monitored thereby to trigger or adjust the active cooling intensity of the corresponding thick section.

[0054] Further, the controller 6 is configured to determine that the PCM is in the phase change period when the first temperature sensor 51 monitors that the temperature reaches and maintains the phase change temperature Tr of the PCM for a preset time t1, and determine that the latent heat of the PCM is exhausted when the temperature is monitored to start rising from Tr, and instruct to increase the opening degree of the corresponding flow regulating valve 322 to implement the quenching.

[0055] One of the core control logics of the controller 6 is to work based on the signals of the first temperature sensors 51. During the casting process, the aluminum liquid at about 710℃ is injected into the cavity through the injection system 7, and the heat is transferred to the composite cooling module 3. The controller 6 continuously receives the data of each first temperature sensor 51. Taking one of the nodal points as an example: when it is monitored that the temperature of this point rises to 580℃ and maintains at this temperature for a preset time t1 (for example, 35 seconds), the controller 6 determines that the PCM at this point is in the phase change period of melting heat absorption, and at this time it keeps the corresponding flow regulating valve 322 in a closed or minimum opening state. It is ensured that the PCM can fully play its heat buffering role, so that the thick section cools slowly in the initial solidification period, the internal metal liquid maintains flowability for a long time, effectively supplements the holes caused by solid state shrinkage, and greatly promotes the densification of the casting;

[0056] When the controller 6 monitors that the temperature of this point starts to continuously rise from the platform of 580℃, it is determined that the latent heat of the PCM at this point has been exhausted, and immediately issues an instruction to increase the opening degree of the corresponding flow regulating valve 322, and 20℃ cooling oil surges into the cooling channel 321 at the maximum flow, to implement "lagging quenching" to this position. After the supplement is basically completed, the strong "quenching" effect makes the metal liquid of this part solidify rapidly, quickly passes through the paste zone which is most prone to intercrystalline loose, and thus closes the remaining liquid phase to form a dense crystalline structure. This "slow first and fast later" cooling curve perfectly matches the ideal solidification path of the alloy, which is an effective means to eliminate the shrinkage defects.

[0057] Further, the controller 6 is also configured to receive and process the signals of the second temperature sensors 52 to calculate the overall temperature difference of the mold and execute the global safety strategy based on the analysis result.

[0058] Further, the global safety strategy executed by the controller 6 includes:

[0059] After the chilling command is generated according to the signal of the first temperature sensor 51, before the command is executed, the real-time global temperature difference data calculated by the second temperature sensor 52 is first verified;

[0060] When the real-time global temperature difference exceeds a preset safety threshold, the chilling command is prohibited from being executed;

[0061] When the real-time global temperature difference does not exceed the preset safety threshold, the chilling command is allowed to be executed.

[0062] Another core task of the controller 6 is to execute the global safety strategy. It processes the signal of the second temperature sensor 52 at the same time to calculate the maximum temperature difference of the whole mold. Specifically, when the controller 6 generates a chilling command for a certain position according to the above-mentioned logic, it does not execute immediately. Before execution, it first verifies the real-time global temperature difference data calculated by the second temperature sensor 52. Safety interlocking process: if the real-time global temperature difference calculated by the system at this time has exceeded the preset safety threshold (for example, 120°C), the controller 6 will prohibit the execution of the chilling command to prevent the casting from being hot cracked due to excessive temperature difference. This safety interlocking mechanism is the key insurance to ensure the reliability of production. It effectively prevents the situation of casting cracking or mold damage caused by the execution of chilling under abnormal working conditions (such as excessive cooling in other areas), greatly improving the safety and stability of the production process. If the real-time global temperature difference is within the safety threshold, the controller 6 allows the chilling command to be executed.

[0063] Further, the controller 6 is also configured to determine the overall cooling stage of the mold according to the signal of the second temperature sensor 52, and to coordinate the starting point and ending point of the cooling process of all composite cooling modules 3 accordingly; the controller 6 coordinates the global cooling rhythm according to the signal of the second temperature sensor 52. For example, when all the second temperature sensors 52 show that the mold temperature is lower than a certain set value (for example, 300°C), the controller 6 can determine that the casting has been basically solidified, and then command all cooling systems to enter a low-power running or standby state.

[0064] Further, the controller 6 is also configured to cross-compare the data of each first temperature sensor 51 and second temperature sensor 52; when the deviation of the data of a single first temperature sensor 51 from the overall trend reflected by the second temperature sensor 52 exceeds the preset tolerance range, it is determined that the first temperature sensor 51 is malfunctioning and an alarm is triggered; the controller 6 also has a system self-diagnosis function. It cross-comparies the data of each first temperature sensor 51 and second temperature sensor 52. For example, if the temperature value displayed by a certain first temperature sensor 51 deviates greatly from the overall temperature rising / falling trend reflected by the other eight first sensors and the second sensor, and the deviation value exceeds the preset tolerance range (e.g. ±50°C), the controller 6 can determine that the first temperature sensor 51 may have failed and damage, and immediately trigger an audible and light alarm.

[0065] After molding, in the demolding unit 4, the ejector rod 41 is driven upward by the electric telescopic rod 42 to eject the casting, completing demolding.

[0066] The working process is as follows:

[0067] Metal liquid filling and system starting:

[0068] The high-temperature metal liquid is filled into the cavity formed by the upper mold 24, the lower mold 22 and the side mold 21 through the injection system 7. Heat is quickly transferred to the mold, and the intelligent temperature control system 5 is started immediately. The controller 6 starts to continuously receive and process the temperature signals from all first temperature sensors 51 and second temperature sensors 52.

[0069] PCM heat storage and buffer cooling:

[0070] The metal liquid heat is concentratedly transferred to the thick part of the hub, and the corresponding composite cooling module 3 starts to work. The PCM phase change material in the passive heat storage unit 31 absorbs heat, and when the temperature reaches its phase change temperature, it undergoes phase change, and in this process, a large amount of latent heat is absorbed while the temperature remains basically unchanged.

[0071] Effect: This process provides a strong heat buffer effect, significantly slows down the solidification speed of the thick part, and keeps the metal liquid in this area flowing for a long time, creating ideal conditions for subsequent full feeding, and fundamentally inhibiting the generation of shrinkage. During this period, the controller 6 keeps the corresponding flow regulating valve 322 closed or has a very small opening, and there is no forced cooling in the cooling channel 321.

[0072] Chill trigger and safety check:

[0073] When the PCM of a certain thick part is completely melted and the latent heat is exhausted, the first temperature sensor 51 of the thick part detects that the temperature starts to continuously rise from the phase change temperature platform. The controller 6 generates a chilling instruction accordingly. Before execution, the controller 6 checks the real-time global temperature difference calculated by the second temperature sensor 52.

[0074] Active chilling and rapid solidification:

[0075] After obtaining the safety permission, the controller 6 instructs to increase the opening of the corresponding flow regulating valve 322. The cryogenic cooling medium then flows into the cooling channel 321 at the maximum flow rate, flows in through the inlet 326, and flows out from the outlet 324, forming a high-efficiency cooling loop.

[0076] System coordination and cooling termination:

[0077] The above process is independently carried out on multiple composite cooling modules 3 asynchronously. The controller 6 independently controls the corresponding flow regulating valve 322 according to the feedback of each first temperature sensor 51, to achieve precise cooling in different time and intensity. When the second temperature sensor 52 signal shows that the casting is completely solidified and cooled to below the predetermined temperature, the controller 6 closes all flow regulating valves 322, ending the cooling process.

[0078] Mold opening and ejection and cycle completion:

[0079] The mold unit 2 is opened, and the ejector rod 41 is driven upward by the electric telescopic rod 42 to eject the casting, completing the demolding, and a complete working cycle is completed.

[0080] Continuous system self-diagnosis:

[0081] During the entire working process, the controller 6 continuously cross-compares the data trends of each first temperature sensor 51 and second temperature sensor 52. If it is found that the reading of a certain first temperature sensor 51 continuously deviates from the overall trend and exceeds the tolerance range, it is judged to be invalid and an alarm is triggered.

[0082] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A split structure high-strength aluminum alloy wheel hub integrated die forging forming combined die structure, comprising a machining table (1), a die unit (2) is arranged on the machining table (1), the die unit (2) comprises an upper die (24), a lower die (22) and a side die (21), characterized in that, The upper die (24) is internally provided with at least one composite cooling module (3) arranged corresponding to thick parts of the hub casting, the composite cooling module (3) is internally integrated with an active cooling unit (32) and a passive heat storage unit (31); the mold further comprises an intelligent temperature control system (5) for cooperatively controlling the cooling behavior of each composite cooling module (3).

2. The split structure high-strength aluminum alloy wheel hub integrated die forming combined die structure according to claim 1, characterized in that, The passive heat storage unit (31) comprises a cavity (311) arranged corresponding to thick parts of the hub casting in the upper die (24), the cavity (311) encapsulates PCM phase change material, the phase change temperature Tr of the PCM phase change material is higher than the solidus temperature of the hub alloy, and the cavity (311) is provided with a filling channel (312) for replacing the phase change material, the filling channel (312) is arranged in the upper die (24), and the filling channel (312) is blocked by a sealing column (313).

3. The split structure high-strength aluminum alloy wheel hub integrated die forming combined die structure according to claim 2, characterized in that, The active cooling unit (32) is a cooling flow channel (321) arranged in the composite cooling module (3) and penetrating through the cavity (311), the cooling flow channel (321) is provided with an independent cooling medium inlet (326) and outlet (324) and a flow regulating valve (322), the inlet (326) of the cooling medium and a main flow channel (323) are in communication, the main flow channel (323) is arranged in the middle of the upper die (24), the outlet (324) and a collecting pipe (325) are fixedly communicated to form a circulating cooling passage, and the inlet (326), the outlet (324), the flow regulating valve (322) and the collecting pipe (325) are all arranged in the upper die (24).

4. The split structure high-strength aluminum alloy wheel hub integrated die forming combined die structure according to claim 3, characterized in that, The intelligent temperature control system (5) comprises: A plurality of first temperature sensors (51) are arranged one by one corresponding to the composite cooling module (3) or the upper die (24) region adjacent thereto, for monitoring the local real-time temperature of the corresponding thick part and the phase change state of the PCM; A plurality of second temperature sensors (52) are arranged in the upper die (24) corresponding to the non-thick cooling area and the base part of the hub casting, for monitoring the temperature field and cooling process of the mold as a whole; A controller (6) is fixedly connected to the upper end surface of the upper die (24) and electrically connected with all the first temperature sensors (51), the second temperature sensors (52) and the flow regulating valves (322).

5. The split structure high-strength aluminum alloy wheel hub integrated die forming combined die structure according to claim 4, characterized in that, The controller (6) is configured to receive signals of the first temperature sensors (51) and independently control the opening and closing and opening degree of the corresponding flow regulating valves (322) based on the phase change state of the PCM monitored thereby, so as to trigger or adjust the active cooling intensity of the corresponding thick part.

6. The split structure high-strength aluminum alloy wheel hub integrated die forming combined die structure according to claim 5, characterized in that, The controller (6) is configured to determine that the PCM phase change material is in a phase change period when the first temperature sensor (51) monitors that the temperature reaches and maintains the PCM phase change material phase change temperature Tr for a preset time t1, and determine that the latent heat of the PCM phase change material is exhausted when the temperature starts to rise from Tr, and instruct to increase the opening degree of the flow regulating valve (322) to implement quenching.

7. The split structure high-strength aluminum alloy wheel hub integrated die forming combined die structure according to claim 4, characterized in that, The controller (6) is further configured to receive and process the signal of the second temperature sensor (52) to calculate the overall temperature difference of the mold, and execute a global safety strategy based on the analysis result.

8. The split structure high-strength aluminum alloy wheel hub integrated die forming combined die structure according to claim 7, characterized in that, The controller (6) executes the global safety strategy, which includes: Before generating the quenching instruction according to the signal of the first temperature sensor (51) and before executing the instruction, first verify the real-time global temperature difference data calculated by the second temperature sensor (52); When the real-time global temperature difference exceeds a preset safety threshold, the quenching instruction is prohibited to be executed; When the real-time global temperature difference does not exceed the preset safety threshold, the quenching instruction is allowed to be executed.

9. The split structure high-strength aluminum alloy wheel hub integrated die- forging forming combined die structure according to claim 4, characterized in that, The controller (6) is further configured to determine the overall cooling stage of the mold according to the signal of the second temperature sensor (52), and coordinate the starting point and ending point of the cooling process of all composite cooling modules (3) according to the determination.

10. The split structure high-strength aluminum alloy wheel hub integrated die- forging forming combined die structure according to claim 4, characterized in that, The controller (6) is further configured to cross-compare the data of each first temperature sensor (51) and the second temperature sensor (52); when the deviation of the data of a single first temperature sensor (51) from the overall trend reflected by the second temperature sensor (52) exceeds a preset tolerance range, it is determined that the first temperature sensor (51) is invalid and an alarm is triggered.

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