Intelligent die-casting die temperature regulation and control device with local chilling system

Abstract

The invention discloses an intelligent die-casting die temperature regulation and control device with a local chilling system, relates to the technical field of die-casting dies, and aims at improving die temperature control on the basis of the chilling system in a die-casting die, and the temperature control process is mainly concentrated on the local position of the chilling system arranged on a die body. On the basis of indirect heat exchange between a strong cooling medium and molten liquid in a cavity, gas is used as a soft heat conduction medium, three indirect heat exchange processes of liquid-liquid, solid-gas-liquid and gas-liquid are included, and under the condition that instant chilling of a chilling system on the local position of the cavity is not affected, the temperature change in a soft heat exchange bin is actively changed, so that the temperature change in the soft heat exchange bin is changed; in order to limit the temperature change process of the mold body, irreversible thermal stress damage caused by large temperature difference of the mold in the chilling process is avoided, and the overall process mainly adopts a dynamic temperature difference control mode and only adopts a temperature return peak value as a reference object to carry out global temperature control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of die casting mold, in particular to a die casting mold temperature intelligent control device with a local chilling system. BACKGROUND

[0002] The essence of the die casting mold is the conversion process of liquid metal (molten state) and solid metal. In the process, a local cooling system must be added to the cavity part. The specific locations include the core / deep cavity part, thick wall of the casting, and geometric mutation. The specific content can be referred to in documents such as CN109047709A and CN103921089A.

[0003] The core technology in the die casting cooling process is the chilling system, which uses a large temperature difference to achieve millisecond rapid solidification. However, the conventional waterway system layout is rigid and cannot completely match the complex cavity curve, resulting in uneven cooling distribution in local areas. In addition, if there is a high temperature difference (> 250℃) between the chilling medium and the mold itself, it will cause mold thermal stress damage. If the chilling speed is too fast (> 1000℃ / s), it will cause the metal surface to solidify too early, hindering the subsequent metal liquid feeding, and will also cause cold separation and under-casting problems. Therefore, it can be understood that the chilling system is essentially a way to promote product formation through extreme heat conduction. However, the temperature control is a key link in the overall chilling technology. Therefore, the present application proposes a solution. SUMMARY

[0004] The purpose of the present application is to provide a die casting mold temperature intelligent control device with a local chilling system. The present application proposes an optimization scheme for the temperature control of the chilling system in the die casting mold. The purpose is to avoid the problem of affecting product formation quality due to excessive temperature difference between the medium and the mold and excessive chilling speed.

[0005] The purpose of the present application can be achieved by the following technical solution: a die casting mold temperature intelligent control device with a local chilling system is applied to the mold body in the die casting mold and uses an infrared temperature measurement structure and a chilling system. The mold body is provided with an external sleeve corresponding to the external position of the internal cavity. The internal bottom position of the external sleeve is provided with an enhanced heat exchange chamber, and the center point of the external sleeve is provided with a chilling channel connected with the enhanced heat exchange chamber.

[0006] The internal position of the external sleeve corresponding to the outer wall of the chilling channel is provided with a soft heat exchange chamber. The enhanced heat exchange chamber and the internal cavity position of the mold body are indirectly contacted. The soft heat exchange chamber and the mold body are indirectly contacted. One end of the external sleeve is provided with a temperature return sleeve. The temperature return sleeve is provided with a plurality of water return capillaries penetrating the soft heat exchange chamber corresponding to the enhanced heat exchange chamber.

[0007] Further setting is that the chilling system generates instant chilling action with the enhanced heat exchange bin through the chilling channel, and in the instant chilling action, the chilling system injects the chilling medium into the enhanced heat exchange bin; the back temperature sleeve generates back temperature measurement action between the enhanced heat exchange bin and the back water capillary, and the back temperature measurement action is used for recovering the chilled medium after heat exchange and obtaining the temperature value of the chilled medium in the back temperature sleeve.

[0008] Further setting is that the soft heat exchange bin is filled with gas, the external sleeve is externally connected with a temperature adjusting back gas pipe corresponding to the soft heat exchange bin, and the chilling channel is externally provided with a heat insulation gasket for isolating the soft heat exchange bin, so as to establish a dynamic temperature difference control system of the associated instant chilling action and back temperature measurement action through the soft heat exchange bin and the temperature adjusting back gas pipe.

[0009] Further setting is that in the dynamic temperature difference control system, the real-time mold temperature of the corresponding external sleeve of the mold body is obtained by the infrared temperature measurement structure, and the extreme low temperature value of the chilled medium injected into the chilling channel by the chilling system is directly obtained.

[0010] Further setting is that in the dynamic temperature difference control system, the temperature threshold Ti of the molten metal in the cavity is obtained, the dynamic gas temperature Tni in the soft heat exchange bin is obtained through the temperature adjusting back gas pipe, and the back temperature peak Tfi of the strong cooling medium in the back temperature sleeve is obtained, and the following heat exchange process is set:

[0011] Heat exchange mode one: the mold body and the molten metal in the cavity have an indirect heat exchange process, and the temperature of the mold body is in an ascending state;

[0012] Heat exchange mode two: the strong cooling medium in the enhanced heat exchange bin and the molten metal in the cavity have an indirect heat exchange process, the temperature of the strong cooling medium rapidly rises, and the molten metal in the cavity is in a descending state;

[0013] Heat exchange mode three: the mold body and the gas in the soft heat exchange bin have an indirect heat exchange process, and the temperature of the gas in the soft heat exchange bin is in an ascending state;

[0014] Heat exchange mode four: based on the heat exchange mode three, the strong cooling medium recovered from the enhanced heat exchange bin and the gas in the soft heat exchange bin have an indirect heat exchange process, and the temperature of the strong cooling medium and the temperature of the gas in the soft heat exchange bin fluctuate.

[0015] Further setting is that the heat exchange formulas of the heat exchange modes one to three are established, the simulation heat exchange formula of the heat exchange mode four is established based on the heat exchange formulas of the heat exchange modes one to three and is expressed as α*|T1-Tfi|=β*|Tni-Tpi|, α and β represent constant factors of the heat exchange of the strong cooling medium and the gas, Tpi represents the temperature value of the environment in the soft heat exchange bin actively changed by the temperature adjusting back gas pipe, and the back temperature peak Tfi is used as a reference object to respectively feedback the heat exchange process between the strong cooling medium and the molten metal in the cavity and the heat exchange process of the strong cooling medium to the mold body.

[0016] The present invention has the following beneficial effects:

[0017] 1. Based on the chilling system in the die-casting mold, the technical problem mentioned in this invention mainly targets the temperature changes of the die-casting mold itself. Taking into account the solid-liquid heat exchange process between the melt in the cavity and the mold body, as well as the liquid-liquid heat exchange process between the strong cooling medium and the melt in the cavity, a soft heat exchange chamber is formed on the basis of an external sleeve without affecting the normal operation of the chilling system. Only gas with low heat conduction efficiency is contained in the chamber, which preliminarily reduces the indirect heat exchange process between the mold body and the chilling channel.

[0018] 2. The key to the present invention lies in: using a temperature-controlled return air pipe to detect and actively change the ambient temperature in the soft heat exchange chamber in real time, and the strong cooling medium after indirect heat exchange undergoes a gas-liquid indirect process with the internal gas in the soft heat exchange chamber. By actively changing the temperature change in the soft heat exchange chamber, the temperature change process of the mold body is limited. This method uses dynamic temperature difference active control and only uses the temperature return peak as a reference object for global temperature control. Its purpose is to avoid irreversible thermal stress damage caused by a large temperature difference in the mold itself during the quenching process, and does not affect the normal operation of the quenching system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the intelligent temperature control device for die casting molds with a local chilling system proposed by the present invention;

[0021] Figure 2 It is a structural schematic diagram of the external sleeve in the present invention;

[0022] Figure 3 is a cross-sectional view of the external sleeve in the present invention;

[0023] Figure 4 For the present invention Figure 2 sectional view of .

[0024] In the figure: 1. Mold body; 2. Temperature return jacket; 3. External sleeve; 4. Temperature control return air pipe; 5. Soft heat exchange chamber; 6. Return water capillary; 7. Quenching channel; 8. Enhanced heat exchange chamber. DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be clearly and completely described below in combination with the embodiments. Apparently, the described embodiments 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 of ordinary skill in the art without creative efforts belong to the scope of the present application.

[0026] Embodiment one: related optimization schemes are proposed for the temperature control of the quenching system in the die casting mold, aiming to avoid the problem that the temperature difference between the medium and the mold is too large, and the quenching speed is too fast, which affects the product forming quality. A solution is proposed in the present application:

[0027] Referring to Figures 1 to 4 The die casting mold temperature intelligent regulation and control device with a local quenching system in the embodiment is applied to the mold body 1 in the die casting mold and uses an infrared temperature measurement structure and a quenching system. The mold body 1 is provided with an external sleeve 3 corresponding to the external position of the internal cavity thereof. The internal bottom end position of the external sleeve 3 is provided with an enhanced heat exchange bin 8. The circumferential point position of the external sleeve 3 is provided with a quenching channel 7 in communication with the enhanced heat exchange bin 8.

[0028] The internal position of the external sleeve 3 corresponding to the outer wall of the quenching channel 7 is provided with a soft heat exchange bin 5. The enhanced heat exchange bin 8 is in indirect contact with the internal cavity position of the mold body 1. The soft heat exchange bin 5 is in indirect contact with the mold body 1. One end position of the external sleeve 3 is provided with a temperature recovery sleeve 2. The temperature recovery sleeve 2 is provided with a plurality of water recovery capillary tubes 6 penetrating the soft heat exchange bin 5 corresponding to the enhanced heat exchange bin 8.

[0029] The quenching system generates an instantaneous quenching action through the quenching channel 7 and the enhanced heat exchange bin 8. In the instantaneous quenching action, the quenching system injects a quenching medium into the enhanced heat exchange bin 8. The temperature recovery sleeve 2 generates a temperature recovery measurement action between the enhanced heat exchange bin 8 through the water recovery capillary tube 6. The temperature recovery measurement action is used for recovering the heat exchanged quenching medium and obtaining the temperature value of the quenching medium in the temperature recovery sleeve 2.

[0030] Basic principle: first of all, it needs to be pointed out that the temperature control process of the mold body 1 is mainly carried out. Specifically, it is for the die casting mold provided with a quenching system. Because the specifications and cavity structures of the die casting mold are not unified, the present application does not make any explanation. Referring to Figure 1 for explanation:

[0031] The essence of the quenching system is to act on the cavity position in an indirect or direct form with a strong cooling medium (such as liquid nitrogen) to achieve the purpose of rapid heat exchange. The present application adopts an indirect heat exchange mode, which uses the external sleeve 3 as an additional structure of the quenching system. Specifically, the purpose of limiting the external sleeve 3 according to the cavity structure is that:

[0032] The outer sleeve 3 is arranged outside the mold body 1 and corresponds to the region with a complex structure in the cavity, so the number and position of the outer sleeve 3 in the application are not limited, and the key is referred to Figure 4 The quenching medium is injected into the enhanced heat exchange bin 8 through the quenching channel 7, and the quenching medium and the molten metal in the cavity complete rapid heat exchange, which is the basic principle of the quenching system.

[0033] Considering the natural heat dissipation process of the molten metal in the cavity, the mold body 1 will also absorb heat, but the temperature of the mold body 1 fluctuates due to the complexity of the cavity structure, which affects the heat transfer effect. Therefore, the application specifically uses an infrared temperature measurement structure to detect in real time, and specifically for the mold temperature at the position of the outer sleeve 3. This also needs to be explained in combination with the quenching system:

[0034] After the quenching medium is injected into the enhanced heat exchange bin 8, indirect heat exchange between the quenching medium and the mold body 1 will also occur. If the mold body 1 produces strong temperature fluctuations, it will also cause irreversible thermal stress damage to the mold body 1. Therefore, the application is improved based on the outer sleeve 3:

[0035] First, there is a soft heat exchange bin 5 between the quenching channel 7 and the outer sleeve 3. The lower end of the outer sleeve 3 is closest to the cavity structure, and the outer sleeve 3 is in direct contact with the mold body 1. During the natural heat dissipation process, the mold body 1 is heated by the heat transfer process of the molten metal inside the cavity. Essentially, only the quenching medium in the enhanced heat exchange bin 8 needs to be rapidly heat-exchanged.

[0036] Therefore, the soft heat exchange bin 5 is used as a "separation layer" between the quenching channel 7 and the mold body 1 to avoid direct heat exchange between the mold body 1 and the quenching channel 7. There is only gas in the soft heat exchange bin 5, and the heat transfer efficiency of the gas is relatively low. In addition, the quenching channel 7 is wrapped with a heat insulation gasket. The key purpose is to reduce the heat exchange degree between the soft heat exchange bin 5 and the quenching medium inside the quenching channel 7, thereby avoiding strong heat exchange between the quenching medium and the mold body 1.

[0037] Example two: supplementary description of the instant quenching action and the temperature recovery measurement action in example one:

[0038] The soft heat exchange bin 5 is filled with gas, the outer sleeve 3 is connected with a temperature adjusting gas return pipe 4 corresponding to the soft heat exchange bin 5, and the quenching channel 7 is provided with a heat insulation gasket for isolating the soft heat exchange bin 5. A dynamic temperature difference control system for the instant quenching action and the temperature recovery measurement action is established through the soft heat exchange bin 5 and the temperature adjusting gas return pipe 4. In the dynamic temperature difference control system, the infrared temperature measurement structure is used to obtain the real-time mold temperature of the mold body 1 corresponding to the outer sleeve 3, and the extreme low temperature value of the quenching medium injected into the quenching channel 7 by the quenching system is directly obtained.

[0039] Scheme description: refer again Figure 4 It is explained that only gas exists in the soft heat exchange chamber 5, and for this, a temperature adjusting gas return pipe 4 is arranged outside the soft heat exchange chamber 5 for real-time detection of the ambient temperature inside the soft heat exchange chamber 5 and for active adjustment of the ambient temperature inside the soft heat exchange chamber 5, and secondly, the added temperature return sleeve 2, which is mainly used for recovering the strong cold medium after heat exchange in the enhanced heat exchange chamber 8;

[0040] The water return capillary tube 6 therein serves as a return pipeline structure of the strong cold medium, and is also located in the soft heat exchange chamber 5 to indirectly exchange heat with the gas therein, and further obtains the real-time temperature in the temperature return sleeve 2 in real time for feedback of the temperature of the strong cold medium after heat exchange, which can be understood as the following heat exchange process existing in the overall structure:

[0041] Heat exchange mode one: indirect heat exchange process between the mold body 1 and the molten liquid inside the cavity, the temperature of the mold body 1 is in an ascending state;

[0042] Heat exchange mode two: indirect heat exchange process between the strong cold medium located in the enhanced heat exchange chamber 8 and the molten liquid inside the cavity, the temperature of the strong cold medium rises rapidly and the molten liquid inside the cavity is in a decreasing state;

[0043] Heat exchange mode three: indirect heat exchange process between the mold body 1 and the gas in the soft heat exchange chamber 5, the temperature of the gas in the soft heat exchange chamber 5 is in an ascending state;

[0044] Heat exchange mode four: based on heat exchange mode three, indirect heat exchange process between the strong cold medium recovered from the enhanced heat exchange chamber 8 and the gas in the soft heat exchange chamber 5, the temperature of the strong cold medium and the temperature of the gas in the soft heat exchange chamber 5 fluctuate;

[0045] In combination with the above, the heat conduction efficiency of heat exchange mode one and heat exchange mode two is the highest, followed by heat exchange mode four, and the heat conduction efficiency of heat exchange mode three is the lowest.

[0046] Example three: this embodiment specifically describes the dynamic temperature difference control system in example two:

[0047] The mold body 1 temperature is specifically considered as a priority condition, and the chilling requirement also needs to be met, for which the extreme low temperature value To of the strong cold medium when it starts to be injected into the enhanced heat exchange chamber 8, the temperature threshold Ti of the molten liquid inside the cavity, and the real-time mold temperature Tt of the mold body 1 obtained by the infrared temperature measurement structure are obtained in the dynamic temperature difference control system. The extreme low temperature value To and the temperature threshold Ti are constants, and the real-time mold temperature Tt is determined according to the temperature threshold Ti, so the real-time mold temperature Tt is set as a relative constant, and the key is:

[0048] The dynamic gas temperature Tni in the soft heat exchange bin 5 and the temperature peak Tfi of the strong cooling medium inside the temperature recovery sleeve 2 are obtained through the temperature recovery gas pipe 4. The dynamic gas temperature Tni and the temperature peak Tfi are variable values, and as shown in Example Two, the dynamic gas temperature Tni and the temperature peak Tfi are related to each other, which is specifically manifested as: the temperature peak Tfi is related to the heat exchange between the strong cooling medium and the molten metal inside the cavity, and the dynamic gas temperature Tni is affected by the real-time mold temperature Tt, the extreme low temperature value To, and the temperature threshold Ti.

[0049] According to the liquid indirect heat exchange principle, the heat exchange formula between the strong cooling medium and the molten metal in the cavity is generated: Q t = K * A * (T1 - T o ), wherein Q t represents the heat absorbed by the strong cooling medium after receiving the molten metal, K represents the heat transfer coefficient of the strong cooling medium, A represents the total heat exchange area of the enhanced heat exchange bin 8, and T1 represents the temperature value of the strong cooling medium after heat exchange. The process is specifically manifested as the heat exchange formula in heat exchange mode two, and the heat exchange formula is generated for heat exchange mode one based on the metal contact heat exchange principle, because it only represents the contact heat exchange process between the molten metal and the mold body. Without considering external factors (natural heat dissipation affected by external environment), the real-time mold temperature Tt of the mold body 1 is only related to the temperature threshold Ti. For this purpose, Tt = X1*Ti is generated, wherein X1 represents a constant factor and X1 < 1, and the real-time mold temperature Tt can be obtained by the infrared temperature measurement structure in real time.

[0050] Secondly, the heat transfer process of the mold body 1 through the external sleeve 3 will heat the gas in the soft heat exchange bin 5, and the heating efficiency is relatively low. The whole soft heat exchange bin 5 is in a relatively closed state, and the heat exchange formula in the associated heat exchange mode three is generated: dynamic gas temperature Tni = X2*Tt, wherein X2 also represents a constant factor and X1 < 1.

[0051] The key lies in heat exchange mode four. The temperature value T1 of the strong cooling medium after the enhanced heat exchange bin can be calculated, and Q t represents the heat released by the molten metal in the cavity after the temperature is reduced from Ti to the specified value. The temperature requirement of the molten metal in the cavity can be marked by referring to the process parameters, and Ta represents the temperature value of the molten metal in the cavity after rapid cooling by the chilling system, and T1 is further calculated by Q t , so that T1 is obtained. In heat exchange mode four, the initial temperature of the strong cooling medium before indirect heat exchange with the gas inside the soft heat exchange bin 5 is T1, and the heat exchange process of the strong cooling medium in the soft heat exchange bin 5 is simulated by further combining the temperature peak Tfi, the dynamic gas temperature Tni, and T1.

[0052] The essence is that the mold body 1 transmits heat to the sleeve 3 outward, the environment temperature in the soft heat exchange bin 5 can be changed in a small range, but in the embodiment, the environment temperature in the soft heat exchange bin 5 is actively changed by the temperature adjusting return air pipe 4, for example, a heating unit is arranged in the temperature adjusting return air pipe 4, and the simulation heat exchange formula in the fourth heat exchange mode is represented as: alpha * |T1-Tfi| = beta * |Tni-Tpi|, wherein alpha and beta represent constant factors in the heat exchange process of the strong cooling medium and the gas respectively, and the strong cooling medium is taken as an example, and the specific performance is that the flow rate of the strong cooling medium flowing through the return water capillary tube 6 and the specific heat capacity of the strong cooling medium are represented.

[0053] The key is that Tpi represents the environment temperature value in the soft heat exchange bin 5 actively changed by the temperature adjusting return air pipe 4, and the specific principle is represented as follows: firstly, the high temperature fluctuation of the mold body 1 caused by the strong cooling medium is avoided, and the return temperature peak Tfi is taken as a reference object to respectively feed back the heat exchange process between the strong cooling medium and the molten metal in the cavity and the heat exchange process of the strong cooling medium on the mold body 1.

[0054] As shown above: based on the chilling system in the die casting mold, the mold temperature control is improved, the temperature control process is mainly concentrated on the local position of the chilling system arranged on the mold body, the indirect heat exchange between the strong cooling medium and the molten metal in the cavity is taken as the basis, the gas is taken as the "soft heat conduction medium", the indirect heat exchange process of liquid-liquid, solid-gas-liquid and gas-liquid is included, the temperature change in the soft heat exchange bin is actively changed to limit the temperature change process of the mold body under the condition that the local position of the cavity is not affected by the instant chilling of the chilling system, and the purpose is to avoid the irreversible thermal stress damage caused by the large temperature difference of the mold itself in the chilling process, and the whole process is mainly in the dynamic temperature difference control mode, and the global temperature control is only taken with the return temperature peak as a reference object.

[0055] The preferred embodiments disclosed above are only used for helping to describe the present application. The preferred embodiments do not describe all the details, and the present application is not limited to the specific implementation. Apparently, according to the content of the description, many modifications and changes can be made. The embodiments are selected and described in the description, in order to better explain the principles and practical applications of the present application, so that the persons skilled in the art can well understand and use the present application. The present application is limited by the claims and the whole scope and equivalents thereof.

Claims

1. An intelligent temperature control device for a die casting mold with a local chilling system, applied to a mold body (1) in a die casting mold and using an infrared temperature measurement structure and a chilling system, characterized in that: The mold body (1) is provided with an external sleeve (3) at an external position corresponding to the internal cavity thereof, the internal bottom end of the external sleeve (3) is provided as an enhanced heat exchange chamber (8), and a quenching channel (7) connected to the enhanced heat exchange chamber (8) is provided at the center point of the external sleeve (3); The external sleeve (3) is provided with a soft heat exchange chamber (5) at an internal position corresponding to the outer wall of the quenching channel (7); the enhanced heat exchange chamber (8) is in indirect contact with the internal cavity position of the mold body (1); the soft heat exchange chamber (5) is in indirect contact with the mold body (1); a temperature return sleeve (2) is provided at one end of the external sleeve (3); and the temperature return sleeve (2) is provided with a plurality of return water capillaries (6) penetrating the soft heat exchange chamber (5) corresponding to the enhanced heat exchange chamber (8).

2. The intelligent temperature control device for die casting mold with a local chilling system according to claim 1, characterized in that: The quenching system generates an instantaneous quenching action through the quenching channel (7) and the enhanced heat exchange chamber (8). During the instantaneous quenching action, a quenching medium is injected into the enhanced heat exchange chamber (8) through the quenching system. The reheating jacket (2) generates a reheating measurement action between the return water capillary (6) and the enhanced heat exchange chamber (8). The reheating measurement action is used to recover the quenching medium after heat exchange and obtain the temperature value of the quenching medium in the reheating jacket (2).

3. The intelligent temperature control device for die casting mold with a local chilling system according to claim 2, characterized in that: The soft heat exchange chamber (5) is filled with gas, the external sleeve (3) is externally connected to a temperature-adjusting return air pipe (4) corresponding to the soft heat exchange chamber (5), and the quenching channel (7) is externally provided with a heat-insulating gasket for isolating the soft heat exchange chamber (5). A dynamic temperature difference control system is established by associating an instantaneous quenching action and a temperature-returning actual measurement action through the soft heat exchange chamber (5) and the temperature-adjusting return air pipe (4).

4. The intelligent temperature control device for die casting mold with a local chilling system according to claim 3, characterized in that: In a dynamic temperature difference control system, an infrared temperature measurement structure is used to obtain the real-time mold temperature Tt at the external sleeve (3) corresponding to the mold body (1), and the extreme low temperature value To of the quenching medium injected into the quenching channel (7) by the quenching system is directly obtained.

5. The intelligent temperature control device for die casting mold with a local chilling system according to claim 3, characterized in that: In the dynamic temperature difference control system, the temperature threshold Ti of the melt inside the cavity is obtained, the dynamic air temperature Tni in the soft heat exchange chamber (5) and the temperature return peak value Tfi of the strong cooling medium inside the temperature return jacket (2) are obtained through the temperature control return air pipe (4), and the following heat exchange process is set: Heat exchange mode 1: Indirect heat exchange occurs between the mold body (1) and the molten liquid inside the cavity, and the temperature of the mold body (1) rises; Heat exchange mode 2: The strong cooling medium located inside the enhanced heat exchange chamber (8) undergoes an indirect heat exchange process with the melt inside the cavity, the temperature of the strong cooling medium rises rapidly and the melt inside the cavity is in a lowering state; Heat exchange mode three: the mold body (1) and the gas in the soft heat exchange chamber (5) undergo an indirect heat exchange process, and the temperature of the gas in the soft heat exchange chamber (5) rises; Heat exchange mode 4: Based on heat exchange mode 3, the strong cooling medium recovered from the enhanced heat exchange chamber (8) and the gas in the soft heat exchange chamber (5) undergo an indirect heat exchange process, and the temperature of the strong cooling medium and the temperature of the gas in the soft heat exchange chamber (5) fluctuate.

6. The intelligent temperature control device for die casting mold with a local chilling system according to claim 5, characterized in that: Establish the heat transfer formulas for heat transfer modes 1 to 3, and use the heat transfer formulas in heat transfer modes 1 to 3 to establish the simulated heat transfer formula for heat transfer mode 4 and express it as α*|T1 - Tfi| ＝ β*|Tni-Tpi|, α and β represent the constant factors of the heat exchange of the strong cooling medium and the gas, Tpi represents the value of the ambient temperature in the soft heat exchange chamber (5) actively changed by the temperature-adjusting return air pipe (4), and the temperature return peak value Tfi is used as a reference object, which are respectively used to feedback the heat exchange process between the strong cooling medium and the melt in the cavity and the heat exchange process of the strong cooling medium on the mold body (1).

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