A die-casting mold preheating management system

Abstract

The present invention discloses a die-casting mold preheating management system, which uses the time before mold change to perform preheating management on the mold. During the preheating process, the mold high-temperature oil monitoring unit is used to scan the mold body surface temperature data to construct the internal temperature of the mold body, and compare it with the temperature required for mold die-casting preheating to confirm the temperature difference between the two. When the temperature difference is greater than the preset temperature threshold, the signal is synchronously transmitted to the PID controller, and the corresponding mold high-temperature oil heating unit or mold high-temperature oil cooling unit is further analyzed and regulated. During the regulation process, the heating or cooling intensity is adjusted according to the real-time temperature difference feedback result. After the temperature tends to stabilize, PID fine-tuning is used to ensure that the temperature difference fluctuation is within the preset temperature threshold to complete preheating. Under the condition of rapid mold change, the mold temperature is maintained above the required use temperature during the 30-minute mold change operation, thereby reducing the output of workpieces discarded during mold change or after mold change, and greatly improving the cost of die-casting parts.

Description

Technical Field

[0001] The patent of this invention relates to the field of die-casting mold preheating technology, specifically a die-casting mold preheating management system. Background Art

[0002] With the promotion of integrated body die-casting technology, more and more die-cast structural parts are gradually being updated. Due to the thin wall thickness and long filling stroke of structural parts, the difference in mold temperature in the early stage causes the aluminum liquid to dissipate heat quickly, and abnormal poor molding quality often occurs at the far end of the product. To solve this problem, it is necessary to gradually increase the mold temperature through multiple slow fillings of aluminum alloy during the die-casting process to achieve a dynamic balance of the temperature field. However, this process will produce a large number of defective scrapped products. The defective products at this stage are called discarded workpieces, which reduces the effective utilization rate and yield rate of equipment and increases the production cost of castings.

[0003] In addition, in the die-casting mold preheating system, on a small machine with a capacity of less than 1500T, due to the small mold size and the heat conduction of the aluminum alloy, the mold temperature can be increased in 3 to 5 rounds of beating. However, on large-tonnage molds, especially die-casting machines with a capacity of more than 7000T, the temperature absorption required for large structural molds is several times higher than that of small molds. If only the aluminum alloy itself is slowly filled and heated, about 10 processes are required. At the same time, during the slow filling process, the thermal alternation of the temperature field will affect the life of the mold itself, and will have a greater impact on the early cracks in the mold and the effective life of the mold.

[0004] If the oil temperature equipment on the machine is used to preheat the mold, it will take an additional 1 to 2 hours due to the power of the heat transfer oil. For large die-casting machines, each mold change and each shutdown and restart operation requires a lot of energy and time. These ineffective losses increase the cost of die-casting parts and reduce the competitiveness of automotive die-casting parts.

[0005] To this end, we invented a quick-change mold preheating management system, which uses the time before mold change to preheat the mold. By utilizing the quick-change function and self-locking function of the external fluid connection plate, combined with intelligent temperature control, we start the offline preheating operation 2 hours in advance before each mold change. Under the condition of rapid mold change, we can keep the mold temperature above the required temperature during the 30-minute mold change operation. Through process optimization, we can achieve temperature uniformity and reduce the output of workpieces rejected during mold change or after mold change, so as to improve equipment utilization rate. Ultimately, we can achieve a state of 1 rejection or 0 rejection, which greatly improves the cost of die-casting parts. Summary of the Invention

[0006] In order to solve the technical problems that the temperature of super-large die-casting molds rises slowly, the thermal stress caused by the high temperature difference will affect the service life of the mold, and multiple discards of workpieces will reduce the production efficiency of the die-casting plant, the patent of this invention provides a die-casting mold preheating management system with a fluid rapid switching function, temperature monitoring and control, and temperature maintenance function during the mold change stage. The external fluid connecting plate and preheating system provided by the present invention will effectively improve the above-mentioned production phenomena.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: a die-casting mold preheating management system, comprising an external fluid connection plate, a mold body, and a management main control system, wherein the management main control system comprises a mold high-temperature oil heating unit, a mold high-temperature oil cooling unit, a mold high-temperature oil injection unit, a mold temperature monitoring unit, and a pipeline oil temperature control unit. The mold body and the external fluid connection plate are each provided with multiple groups of pipeline channels, and both end ports of each group of pipeline channels in the external fluid connection plate are provided with embedded thermocouples;

[0008] The mold high-temperature oil heating unit heats and provides high-temperature heat-conducting oil through a mobile oil temperature machine, and then injects the high-temperature oil into the mold body through the mold high-temperature oil injection unit for preliminary preheating;

[0009] The mold temperature monitoring unit is equipped with an infrared thermal imager and a data analysis host computer. The infrared thermal imager scans the surface temperature data of the mold body and feeds it back to the data analysis host computer. The data analysis host computer has a built-in recognition construction module and a comparative analysis module.

[0010] After the initial preheating is completed, the identification and construction module constructs the internal temperature of the mold body according to the surface temperature of the mold body. The comparison and analysis module compares the internal temperature of the mold body with the mold die-casting preheating temperature and determines the temperature difference between the two. When the temperature difference is greater than the preset temperature threshold, the temperature difference data is fed back to the pipeline oil temperature control unit.

[0011] The pipeline oil temperature control unit is equipped with a PID controller, which controls the heating or cooling of the oil temperature in the corresponding channel through further analysis based on the temperature difference feedback result. When the temperature reaches the set requirement, it prompts that the mold preheating is completed.

[0012] Preferably, the recognition building module receives the surface temperature of the mold body transmitted by the infrared thermal imager, identifies the temperature gradient estimation, and then calculates the internal temperature of the mold body according to its built-in algorithm;

[0013] ;

[0014] in, is the internal temperature of the mold body, is the surface temperature of the mold body, is the temperature gradient of infrared thermal imaging, is the wall thickness of the mold body, is the thermal conductivity of the mold body material.

[0015] Preferably, the comparative analysis module calculates the internal temperature of the mold body Die casting preheating temperature For comparison, let The actual temperature required for die casting. , compare the temperature difference between the two , when the temperature difference When the temperature is greater than a preset temperature threshold, the data analysis host computer feeds back the temperature difference data to the pipeline oil temperature control unit.

[0016] Preferably, the pipeline oil temperature control unit further analyzes and compares and The relationship between When , it indicates that the internal temperature of the mold body is too high and needs to be cooled. The pipeline oil temperature control unit opens the mold high-temperature oil cooling unit through the PID controller to regulate the cooling water flow, and cooperates with the auxiliary regulation of the thermal oil flow to control the temperature and stop cooling after reaching the set temperature.

[0017] Preferably, when When the temperature inside the mold body is low, it indicates that the temperature needs to be raised. The pipeline oil temperature control unit controls the mold high-temperature oil heating unit to heat the thermal oil in the channel, and monitors the thermal oil temperature in real time through the embedded thermocouple. The heating is stopped after the temperature required for mold die-casting is reached.

[0018] Preferably, the mold high-temperature oil cooling unit is provided with a heat exchanger, a water supply, a water return and a water cooling pipe. The heat exchanger is installed on the top of the external fluid connecting plate, and the two end ports of the heat exchanger connected to the connecting pipe are installed with thermistors. The water supply and the water return are arranged inside the external fluid connecting plate.

[0019] Preferably, the heat exchanger is connected to the water supply and the water return through connecting pipes respectively, the water cooling pipe is spirally wrapped around the outer circumference of the pipeline channel inside the external fluid connecting plate, and the input port of the water cooling pipe is connected to the water supply, and the output port of the water cooling pipe is connected to the water return, and a limited water control valve is provided inside the water supply.

[0020] Preferably, the mold high-temperature oil injection unit is provided with a manual quick-change plate, an external fluid connecting plate and an external quick-change plate, wherein one side of the manual quick-change plate is connected to a mobile oil temperature machine, and one side of the external quick-change plate is connected to the mold body. The pipeline of the mobile oil temperature machine is installed with the manual quick-change plate structure, and the manual quick-change plate, the external fluid connecting plate and the external quick-change plate are connected in sequence.

[0021] Preferably, the mold body is fixedly connected to the external fluid connecting plate through an external quick-change plate, and the external fluid connecting plate moves with the die-casting mold. The mold body does not need to be preheated on the die-casting machine, and the mold body can be preheated in the die-casting preparation area.

[0022] Preferably, the high-temperature heat-conducting oil provided by the mobile oil temperature machine circulates inside the mold body to preheat and heat the mold, and the port joints of the external fluid connecting plate and the external quick-change plate both adopt a steel spring self-locking pressure-resistant structure.

[0023] Compared with the existing technology, the beneficial effects of the present invention are:

[0024] 1. During the preheating process, the present invention uses the mold high-temperature oil monitoring unit to scan the mold body surface temperature data to construct the internal temperature of the mold body, and compares it with the temperature required for mold die-casting preheating to confirm the temperature difference between the two. When the temperature difference is greater than the preset temperature threshold, it indicates that the mold preheating temperature is too low or too high. The signal is then synchronously transmitted to the PID controller for further analysis and regulation of the corresponding mold high-temperature oil heating unit or mold high-temperature oil cooling unit. During the regulation process, the heating or cooling intensity is adjusted based on the real-time temperature difference feedback result. After the temperature stabilizes, PID fine-tuning is used to ensure that the temperature difference fluctuation is within the preset temperature threshold.

[0025] 2. The present invention is provided with an external fluid connecting plate and an external quick-change plate. The external fluid connecting plate can be matched and moved with the die-casting mold. The mold body does not need to be preheated on the die-casting machine table. The mold body can be preheated in the die-casting preparation area. The offline preheating operation is started 2 hours in advance before each mold change. After the temperature reaches the preheating condition, the mobile oil temperature machine and the preheating mold can be manually separated. Since the port joints of the external fluid connecting plate and the external quick-change plate adopt a steel spring self-locking and pressure-resistant structure, one-way throttling self-locking can be achieved after the external quick-connect plate or the external fluid connecting plate is separated from the heating equipment to avoid the heat transfer oil from losing temperature. The self-locking function of the interface is utilized to keep the mold temperature above the required temperature during the 30-minute mold change operation. Through process optimization, the state of 1-time or 0-time rejection can eventually be achieved, which greatly improves the cost of die-casting parts and can also meet the technical requirements of rapid production after mold change. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the structural diagram of the management main control system of the patent of this invention;

[0027] Figure 2 This is a schematic diagram of the die-casting mold preheating connection of the patent of this invention;

[0028] Figure 3 This is a schematic diagram of the connection of the external fluid connection plate of the patent of this invention;

[0029] Figure 4 This is a schematic diagram of the intelligent temperature control preheating patent of this invention;

[0030] Figure 5 This is a schematic diagram of the internal structure of the external fluid connection plate of the patent of this invention;

[0031] Figure 6 yes Figure 5 A in the middle is an enlarged schematic diagram;

[0032] Figure 7 yes Figure 5 The enlarged schematic diagram of point B in the middle;

[0033] Figure 8 This is the patented intelligent temperature control preheating flow chart of this invention.

[0034] Description of reference numerals:

[0035] 1. Mobile oil temperature controller; 2. Mold body; 3. External fluid connection plate; 4. Manual quick-change plate; 5. External quick-change plate; 6. Infrared thermal imager; 7. Data analysis host computer; 8. PID controller; 9. Heat exchanger; 10. Water supply device; 11. Water return device; 12. Water cooling pipe; 13. Water limiting control valve; 14. Embedded thermocouple; 15. Thermistor. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0037] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0038] Example:

[0039] like Figure 1-3 As shown, the present invention provides a die-casting mold preheating management system, including a mold body 2, an external fluid connection plate 3 and a management main control system. The management main control system includes a mold high-temperature oil heating unit, a mold high-temperature oil cooling unit, a mold high-temperature oil injection unit, a mold temperature monitoring unit and a pipeline oil temperature control unit. Multiple sets of pipeline channels are provided inside the mold body 2 and the external fluid connection plate 3.

[0040] Furthermore, the mold high-temperature oil injection unit is provided with a manual quick-change plate 4, an external fluid connecting plate 3 and an external quick-change plate 5. The mold main body 2 is fixedly connected to the external fluid connecting plate 3 through the external quick-change plate 5, wherein one side of the manual quick-change plate 4 is connected to the mobile oil temperature machine 1, and one side of the external quick-change plate 3 is connected to the mold main body 2. The pipeline of the mobile oil temperature machine 1 is structurally installed with the manual quick-change plate 4, and the manual quick-change plate 4, the external fluid connecting plate 3, and the external quick-change plate 5 are connected in sequence.

[0041] Specifically, the external fluid connecting plate 3 moves with the die-casting mold, and the mold body 2 does not need to be preheated on the die-casting machine. The mold body 2 can be preheated in the die-casting preparation area. The mold high-temperature oil heating unit heats and provides high-temperature heat transfer oil through the mobile oil temperature machine 1, and then injects the high-temperature oil into the interior of the mold body 2 through the mold high-temperature oil injection unit for preliminary preheating and heating. The port joints of the external fluid connecting plate 3 and the external quick-change plate 5 both adopt a steel spring self-locking pressure-resistant structure. After the preheating is completed, since the joint has a fluid self-locking device, when the external quick-connect plate 5 or the external fluid connecting plate 3 is separated from the heating equipment, one-way throttling self-locking is achieved to avoid the heat transfer oil from losing temperature.

[0042] like Figure 5-7 As shown, multiple groups of pipeline channels can be set inside the external fluid connecting plate 3, and each group of pipeline channels is composed of multiple groups of tree-like flow channels connected together. Embedded thermocouples 14 are set in the two end ports of each group of pipeline channels. The mold high-temperature oil cooling unit is composed of a heat exchanger 9, a water supply 10, a water return 11 and a water cooling pipe 12, and is arranged on the external fluid connecting plate 3. The heat exchanger 9 is installed on the top of the external fluid connecting plate 3, and the water supply 10 and the water return 11 are arranged inside the external fluid connecting plate 3. The heat exchanger 9 is connected to the water supply 10 and the water return 11 respectively through connecting pipes, and the two end ports of the heat exchanger 9 connected to the connecting pipes are installed with thermistors 15. The water cooling pipe 12 is spirally wrapped around the outer periphery of the pipeline channel inside the external fluid connecting plate 3, and the input port of the water cooling pipe 12 is connected to the water supply 10, and the output port of the water cooling pipe 12 is connected to the water return 11. A limited water control valve 13 is set inside the water supply.

[0043] like Figure 4 、 Figure 8 As shown, the mold temperature monitoring unit is provided with an infrared thermal imager 6 and a data analysis host computer 7. After the preliminary preheating is completed, the surface temperature data of the mold body 2 is scanned by the infrared thermal imager 6 and fed back to the data analysis host computer 7. The data analysis host computer 7 has built-in recognition and construction modules and comparative analysis modules. The recognition and construction module constructs the internal temperature of the mold body 2 according to the surface temperature of the mold body 2. The comparative analysis module compares the internal temperature of the mold body 2 with the mold die-casting preheating temperature and confirms the temperature difference between the two. When the temperature difference is less than the preset temperature threshold, it indicates that the mold preheating is completed.

[0044] When the temperature difference is greater than the preset temperature threshold, the temperature difference data is fed back to the pipeline oil temperature control unit, which includes a PID controller 8 arranged on the top of the external fluid connection plate 3. The temperature difference data can be used to further analyze whether the mold temperature of the corresponding channel is too high or too low, and control the heating or cooling of the oil temperature of the corresponding channel. When heating is required, the heating signal is transmitted to the mold high-temperature oil heating unit, and the mold high-temperature oil heating unit controls the temperature rise of the heat transfer oil in the corresponding channel. When cooling is required, the cooling data is transmitted to the mold high-temperature oil cooling unit, and the mold high-temperature oil cooling unit controls the cooling water to cool the heat transfer oil. When the temperature reaches the set required temperature, After that, it prompts that the mold preheating is completed.

[0045] Specifically, the recognition building module receives the surface temperature of the mold body 2 transmitted by the infrared thermal imager 6, and recognizes and estimates the temperature gradient , temperature gradient Indicates the temperature change of the mold within a unit distance, and then calculates the internal temperature of the mold body based on its built-in algorithm;

[0046] ;

[0047] in, is the internal temperature of the mold body, is the surface temperature of the mold body, is the wall thickness of the mold body, is the thermal conductivity of the mold body material.

[0048] Specifically, the comparative analysis module compares the internal temperature of the mold body Die casting preheating temperature For comparison, , The actual temperature required for the die casting mold is obtained by Then compare it with the preset temperature threshold, which is set to 5°. When the temperature is lower than the preset threshold, it indicates that the mold preheating is complete.

[0049] Specifically, the PID controller 8 can optimize the controller performance by tuning the PID parameters in the early stage through the step response method. The PID controller uses analog signals to connect with the water limit control valve 13, the embedded thermocouple 14, and the thermistor 15 by wire. At the same time, it uses control signals to connect with the variable frequency pump and heater in the mobile oil temperature machine 1 wirelessly. The temperature difference is programmed into the PID controller 8. Upper limit, setting The above is the upper limit. When the temperature difference exceeds the upper limit, it indicates that the thermal oil temperature is significantly higher or lower than ;

[0050] When the temperature difference When the temperature is greater than the preset threshold, the data analysis host computer will feed back the temperature difference data to the pipeline oil temperature control unit, which will further analyze and compare the temperature difference data. and The relationship between:

[0051] when When the temperature inside the mold body is too high and needs to be cooled, the PID controller 8 in the pipeline oil temperature control unit receives the signal that the temperature needs to be cooled, controls the heat exchanger 9 of the mold high-temperature oil cooling unit to work, and allows cooling water to enter the water cooling pipe 12 to cool the high-temperature heat-conducting oil in the pipeline channel, and simultaneously monitors the temperature monitoring data of the embedded thermocouple 14 and the thermistor 15, and then according to the real-time temperature difference Feedback results, rapid response to adjust the valve opening of the water limiting control valve 13 to control the cooling water flow;

[0052] During the cooling process, when the temperature of the thermal oil is significantly higher than When the temperature drops below 0.05, the PID controller 8 will control the water limit control valve 13 to be fully opened and start the variable frequency pump to run at high speed to achieve rapid cooling of the high-temperature thermal oil. It will simultaneously collect the changes in the electrical signals of the embedded thermocouple 14 and the thermistor 15, identify the inlet and outlet temperatures of the thermal oil in the external fluid connection plate 3 and the inlet and outlet temperatures of the cooling water in the water cooling pipe 12, and adjust the valve opening of the water limit control valve 13 and the operation of the variable frequency pump in time according to the temperature changes to control the flow of cooling water and thermal oil. Finally, according to the real-time temperature difference Feedback results, use PID fine-tuning to ensure that the temperature difference fluctuation is within the preset temperature threshold.

[0053] when When the temperature inside the mold body is too low and needs to be raised, the PID controller 8 in the pipeline oil temperature control unit receives the signal that the temperature needs to be raised, controls the mobile oil temperature machine 1 of the mold high-temperature oil heating unit to work, starts the variable frequency pump and heater, and heats the heat transfer oil in the channel;

[0054] During the heating process, when the temperature of the heat transfer oil is significantly lower than When the temperature is high, the PID controller 8 will control the variable frequency pump to run at a low speed and adjust the heater to the highest power to achieve rapid heating of the thermal oil. It will also collect the electrical signal changes of the embedded thermocouple 14, identify the inlet and outlet temperatures of the thermal oil in the external fluid connection plate 3, and adjust the power of the heater and the operation of the variable frequency pump in time according to the temperature changes. Finally, according to the real-time temperature difference Feedback results, use PID fine-tuning to ensure that the temperature difference fluctuation is within the preset temperature threshold.

[0055] After the temperature reaches the preheating condition, the oil temperature machine and the preheating mold can be manually separated. The heat transfer oil circulating inside the mold is sealed inside the mold body 2 under the self-locking condition of the joint. At this time, the mold is kept warm for up to 30 minutes. The mold change operation is completed during this period, and the technical requirement of rapid production after mold change can be achieved.

[0056] The above embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A die-casting mold preheating management system, comprising an external fluid connection plate, a mold body, and a management control system, characterized in that: The management main control system includes a mold high-temperature oil heating unit, a mold high-temperature oil cooling unit, a mold high-temperature oil injection unit, a mold temperature monitoring unit, and a pipeline oil temperature control unit. The mold body and the external fluid connection plate are each provided with multiple groups of pipeline channels. Both end ports of each group of pipeline channels in the external fluid connection plate are provided with embedded thermocouples. The mold high-temperature oil heating unit heats and provides high-temperature heat-conducting oil through a mobile oil temperature machine, and then injects the high-temperature oil into the mold body through the mold high-temperature oil injection unit for preliminary preheating; The mold high-temperature oil cooling unit is provided with a heat exchanger, a water supply device, a water return device and a water cooling pipe, and the water cooling pipe is spirally wrapped around the outer periphery of the pipeline channel inside the external fluid connection plate; The mold high-temperature oil injection unit is provided with a manual quick-change plate, an external fluid connection plate and an external quick-change plate, and the port joints of the external fluid connection plate and the external quick-change plate both adopt a steel spring self-locking pressure-resistant structure; The mold temperature monitoring unit is equipped with an infrared thermal imager and a data analysis host computer. The infrared thermal imager scans the surface temperature data of the mold body and feeds it back to the data analysis host computer. The data analysis host computer has a built-in recognition construction module and a comparative analysis module. After the initial preheating is completed, the identification and construction module constructs the internal temperature of the mold body according to the surface temperature of the mold body. The comparison and analysis module compares the internal temperature of the mold body with the temperature required for die casting preheating and confirms the temperature difference between the two. When the temperature difference is greater than the preset temperature threshold, the temperature difference data is fed back to the pipeline oil temperature control unit. The pipeline oil temperature control unit is equipped with a PID controller, which controls the heating or cooling of the oil temperature in the corresponding channel through further analysis based on the temperature difference feedback result. When the temperature reaches the set requirement, it prompts that the mold preheating is completed.

2. The die-casting mold preheating management system according to claim 1, characterized in that: The recognition building module receives the surface temperature of the mold body transmitted by the infrared thermal imager, identifies the temperature gradient, and then calculates the internal temperature of the mold body according to its built-in algorithm; ； in, is the internal temperature of the mold body, is the surface temperature of the mold body, is the temperature gradient of infrared thermal imaging, is the wall thickness of the mold body, is the thermal conductivity of the mold body material.

3. The die-casting mold preheating management system according to claim 1, characterized in that: The comparative analysis module calculates the internal temperature of the mold body Die casting preheating temperature For comparison, let The actual temperature required for die casting. , compare the temperature difference between the two , when the temperature difference When the temperature is greater than a preset temperature threshold, the data analysis host computer feeds back the temperature difference data to the pipeline oil temperature control unit.

4. The die-casting mold preheating management system according to claim 3, characterized in that: The pipeline oil temperature control unit further analyzes and compares and The relationship between When the temperature inside the mold body is too high, it indicates that the temperature needs to be lowered. The pipeline oil temperature control unit opens the mold high-temperature oil cooling unit through the PID controller to regulate the cooling water flow, and cooperates with the auxiliary regulation of the heat transfer oil flow to control the temperature. When the set mold die casting preheating temperature is reached, Then stop cooling.

5. The die-casting mold preheating management system according to claim 4, characterized in that: when When the temperature inside the mold body is too low, it indicates that the temperature needs to be raised. The pipeline oil temperature control unit controls the mold high-temperature oil heating unit to heat the heat transfer oil in the channel, and monitors the heat transfer oil temperature in real time through the embedded thermocouple. When the set mold die casting preheating temperature is reached, Then stop heating.

6. The die-casting mold preheating management system according to claim 1, characterized in that: The heat exchanger is installed on the top of the external fluid connection plate, and the two end ports of the heat exchanger connected to the connecting pipe are installed with thermistors, and the water supply device and the water return device are arranged inside the external fluid connection plate.

7. The die-casting mold preheating management system according to claim 1, characterized in that: The heat exchanger is connected to the water supply and the water return through connecting pipes respectively. The input port of the water cooling pipe is connected to the water supply, and the output port of the water cooling pipe is connected to the water return. A limited water control valve is set inside the water supply.

8. The die-casting mold preheating management system according to claim 1, characterized in that: One side of the manual quick-change plate is connected to a mobile oil temperature machine, one side of the external quick-change plate is connected to the mold body, the pipeline of the mobile oil temperature machine is installed with the manual quick-change plate structure, and the manual quick-change plate, the external fluid connection plate, and the external quick-change plate are connected in sequence.

9. The die-casting mold preheating management system according to claim 8, characterized in that: The high-temperature heat-conducting oil provided by the mobile oil temperature controller circulates inside the mold body to preheat and heat the mold. The mold body is fixedly connected to the external fluid connection plate through an external quick-change plate. The external fluid connection plate moves with the die-casting mold. The mold body does not need to be preheated on the die-casting machine table, and can be preheated in the die-casting preparation area.

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