A mold temperature control system and method for a large complex die-casting mold

Abstract

The application discloses a mold temperature control system and method for large and complex die-casting molds, which comprises a mold temperature controller, a mold temperature acquisition unit, an oil temperature machine, a heating oil pipeline, a cooling water pump, a cooling water tank, a cooling water pipeline, a fixed mold, a movable mold, a fixed mold plate, a movable mold plate, a pressure injection cylinder, a pressure injection punch, a pipeline integrated board and a cable. The mold temperature controller is responsible for centralized management of mold temperature control equipment, the mold temperature acquisition unit is responsible for acquisition of the temperature of the fixed mold core, the movable mold core, the pressure injection cylinder and the pressure injection punch, the oil temperature machine is responsible for delivery of heating oil, and the cooling water pump is responsible for delivery of high-pressure cooling water. Through integrated control of the software and hardware of the mold temperature control equipment, the application solves the problems of scattered layout, poor coordination and low work efficiency of the mold temperature control equipment, improves the process control capability of mold temperature control, realizes real-time and accurate control of mold temperature, reduces defects such as deformation, shrinkage and porosity of die-casting parts, and improves the dimensional stability and the qualified rate of large and complex die-casting parts.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of die casting, and particularly relates to a mold temperature control system and method for a large and complex die casting mold. BACKGROUND

[0002] Die casting is a molding technology in which an aluminum alloy liquid is injected into a mold cavity under high speed and high pressure, and then cooled and solidified to obtain a die casting. Die casting molding has the advantages of high production efficiency and the ability to form various complex die castings, and is widely used in the molding of parts of automobiles, motorcycles, electronic appliances and mechanical equipment. The mold is an important tool for die casting molding, and the mold temperature directly affects the filling state and solidification process of the aluminum alloy liquid, and ultimately affects the shape, size and quality of the die casting. Improper mold temperature control will cause defects such as deformation, shrinkage, porosity, cold shut, and flow lines in the die casting, resulting in the rejection of the die casting.

[0003] With the development of new energy vehicles and the application of integrated die casting technology, the size of the die casting mold is becoming larger and the structure is becoming more complex, and the shape, size and performance of the die casting are also required to be higher and higher, so the mold temperature control of the die casting mold is also required to be higher and higher. The large and complex die casting mold has many heating and cooling channels inside, and there are many temperature monitoring points, and accordingly there are many heating equipment, cooling equipment and temperature monitoring equipment, and the increase of the mold temperature control equipment brings great difficulty to the design and layout of the mold temperature control system.

[0004] Through literature retrieval and production practice, the existing technology usually adopts independent control of each device, which has problems such as scattered device layout, poor coordination, low work efficiency, and poor mold temperature control precision, resulting in serious deformation, shrinkage and porosity of the die casting, and low qualified rate and high rejection rate of the die casting. Therefore, the mold temperature control system and method of the existing large and complex die casting mold still needs to be improved and developed. SUMMARY

[0005] In view of the problems and deficiencies mentioned in the background art, the present application provides a mold temperature control system and method for a large and complex die casting mold, which solves the problems of scattered device layout, poor coordination and low work efficiency through software and hardware integrated control of mold temperature control equipment, improves the process control ability of mold temperature control, realizes real-time and accurate control of mold temperature, reduces the deformation, shrinkage and porosity of the die casting, and improves the dimensional stability and qualified rate of the large and complex die casting.

[0006] The technical scheme adopted by the present application to achieve the above-mentioned purposes is as follows:

[0007] The application provides a mold temperature control system for a large and complex die-casting mold.

[0008] Preferably, the mold temperature controller has a switch state display function of the oil temperature machine and the cooling water pump, and a temperature setting, display and storage function of the fixed mold, the movable mold, the injection cylinder and the injection punch.

[0009] Preferably, the mold temperature acquisition unit is a platinum-rhodium thermocouple with a diameter of 1-2 mm.

[0010] Preferably, the oil temperature machine has a power of 25-30 kW, an output heating oil temperature of 200-400 DEG C, an output flow of the heating oil of 80-100 L / min and an output heating oil pressure of 0.5-1 MPa.

[0011] Preferably, the cooling water pump has a power of 10-15 kW, an output flow of the cooling water of 120-150 L / min, an output cooling water pressure of 2-3 MPa and an output cooling water temperature of 15-30 DEG C.

[0012] Preferably, the fixed mold and the movable mold are respectively divided into different temperature control areas, each of which is respectively provided with a mold temperature acquisition unit, a heating oil passage and a cooling water passage, the heating oil passage is connected with the oil temperature machine through a heating oil pipeline, and the cooling water passage is connected with the cooling water pump through a cooling water pipeline.

[0013] Preferably, the injection cylinder is provided with a mold temperature acquisition unit, a heating oil passage and a cooling water passage, the mold temperature acquisition unit is connected with the mold temperature controller through a cable, the heating oil passage is connected with the oil temperature machine through a heating oil pipeline, and the cooling water passage is connected with the cooling water pump through a cooling water pipeline.

[0014] Preferably, the injection punch is provided with a mold temperature acquisition unit, a heating oil channel and a cooling water channel, the mold temperature acquisition unit is connected with the mold temperature controller through a cable, the heating oil channel is connected with the oil heater through a heating oil pipeline, and the cooling water channel is connected with the cooling water pump through a cooling water pipeline.

[0015] The second aspect of the present application provides a mold temperature control method for a large and complex die casting mold, which adopts the mold temperature control system, and is characterized by sequentially comprising the following steps.

[0016] Step one: setting the temperature control ranges of the fixed mold, the movable mold, the injection cylinder and the injection punch through the mold temperature controller;

[0017] Step two: starting the oil heater to deliver heating oil to the fixed mold, the movable mold, the injection cylinder and the injection punch to heat through the mold temperature controller;

[0018] Step three: starting the cooling water pump to deliver high-pressure cooling water to the fixed mold, the movable mold, the injection cylinder and the injection punch to cool through the mold temperature controller;

[0019] Step four: starting the die casting process when the temperatures of the fixed mold, the movable mold, the injection cylinder and the injection punch reach the respective temperature control ranges;

[0020] Step five: sequentially closing the oil heater and the cooling water pump to stop heating and cooling the fixed mold, the movable mold, the injection cylinder and the injection punch through the mold temperature controller when the die casting process is completed, and ending the mold temperature control process.

[0021] Preferably, the temperature control ranges of the fixed mold and the movable mold in step one are 330-380℃.

[0022] Preferably, the temperature control range of the injection cylinder in step one is 410-430℃.

[0023] Preferably, the temperature control range of the injection punch in step one is 180-200℃.

[0024] Preferably, the heating time of starting the oil heater to deliver heating oil to the fixed mold, the movable mold, the injection cylinder and the injection punch to heat in step two is not less than 30 minutes.

[0025] Preferably, the cooling time of starting the cooling water pump to deliver high-pressure cooling water to the fixed mold, the movable mold, the injection cylinder and the injection punch to cool in step three is not less than 30 minutes.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] (1) The application solves the problems of scattered layout, poor coordination and low work efficiency of the temperature control equipment by integrating the software and hardware of the numerous mold temperature control devices, and the heating and cooling processes of the fixed mold, the movable mold, the injection cylinder and the injection punch are centrally controlled by the mold temperature controller, the coordination between the devices is strengthened, and the process control ability of the mold temperature control is improved;

[0028] (2) The application divides different temperature control areas on the fixed mold and the movable mold, and sets mold temperature collection units, heating oil channels and cooling water channels on the injection cylinder and the injection punch, and realizes precise control of the temperature of the die casting mold, the injection cylinder and the injection punch through temperature collection of the mold temperature collection unit, heating of the heating oil channel and cooling of the cooling water channel;

[0029] (3) The application includes the temperature control of the injection cylinder and the injection punch into the mold temperature control system, effectively reduces the influence of the temperature fluctuation of the injection cylinder and the injection punch on the aluminum alloy liquid temperature during filling, improves the stability and consistency of the aluminum alloy liquid temperature during filling, and improves the rationality and accuracy of the mold temperature control;

[0030] (4) The application realizes precise control of the mold temperature of large and complex die casting molds by optimizing the mold temperature control equipment, key parameters and process flow, and through the precise control of the mold temperature, the deformation, shrinkage and porosity of the die casting parts can be effectively reduced, and the size stability and qualification rate of the large and complex die casting parts can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure schematic view of the mold temperature control system of the application.

[0032] Figure 2 It is a structure schematic view of the movable mold of the application.

[0033] Figure 3 It is a front structure schematic view of the movable mold of the application.

[0034] Figure 4 It is a partial cross-sectional structure schematic view of the movable mold of the application.

[0035] Figure 5 It is a cross-sectional structure schematic view of the injection cylinder of the application.

[0036] Figure 6 It is a cross-sectional structure schematic view of the injection punch of the application. DETAILED DESCRIPTION

[0037] The application will be further described and explained in conjunction with the accompanying drawings.

[0038] As Figures 1-6As shown, a mold temperature control system of a large and complex die-casting mold comprises a mold temperature controller 1, a mold temperature acquisition unit 2, an oil temperature machine 3, a heating oil pipeline 4, a cooling water pump 5, a cooling water tank 6, a cooling water pipeline 7, a fixed mold 8, a movable mold 9, a fixed mold plate 10, a movable mold plate 11, a injection cylinder 12, an injection punch 13, a pipeline integration plate 14 and a cable 15.

[0039] The mold temperature controller 1 is connected with the mold temperature acquisition unit 2, the oil temperature machine 3 and the cooling water pump 5 through the cable 15, responsible for accepting temperature data from the mold temperature acquisition unit 2 and controlling the opening and closing actions of the oil temperature machine 3 and the cooling water pump 5, realizing the centralized management of the mold temperature control equipment.

[0040] The mold temperature acquisition unit 2 is respectively arranged on the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13, connected with the mold temperature controller 1 through the cable 15, responsible for collecting temperature data of the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13.

[0041] The oil temperature machine 3 is connected with the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13 through the heating oil pipeline 4, responsible for delivering heating oil to the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13, realizing the heating and recycling of the heating oil of the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13.

[0042] The cooling water pump 5 is connected with the cooling water tank 6, the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13 through the cooling water pipeline 7, responsible for delivering high-pressure cooling water to the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13, realizing the cooling and recycling of the cooling water of the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13.

[0043] The fixed mold 8 is installed on the fixed mold plate 10 of the die-casting machine, the movable mold 9 is installed on the movable mold plate 11 of the die-casting machine, the injection punch 13 is arranged on the injection cylinder 12, and the injection cylinder 12 is installed on the fixed mold plate 10 of the die-casting machine.

[0044] The pipeline integration plate 14 is installed on the fixed mold plate 10 and the movable mold plate 11 of the die-casting machine, and the pipeline integration plate 14 collects the heating oil pipeline 4 between the fixed mold 8, the movable mold 9 and the oil temperature machine 3 and the cooling water pipeline 7 between the fixed mold 8, the movable mold 9 and the cooling water pump 5.

[0045] The fixed mold 8 and the movable mold 9 comprise a mold frame 16, a mold core 17 and a mold cavity surface 18.

[0046] As preferred, the mold temperature controller 1 has the switch state display function of the oil temperature machine 3 and the cooling water pump 5 and the temperature setting, display and storage function of the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13.

[0047] As preferred, the mold temperature collecting unit 2 is a platinum-rhodium thermocouple with a diameter of 1-2 mm. The platinum-rhodium thermocouple with a small diameter has the advantages of fast temperature collecting response, high accuracy and long service life. In order to achieve fast and accurate mold temperature collecting, the platinum-rhodium thermocouple with a diameter of 1-2 mm is preferred.

[0048] As preferred, the oil temperature machine 3 has a power of 25-30 kW, an output heating oil temperature of 200-400℃, an output heating oil flow rate of 80-100 L / min and an output heating oil pressure of 0.5-1 MPa.

[0049] As preferred, the cooling water pump 5 has a power of 10-15 kW, an output cooling water flow rate of 120-150 L / min, an output cooling water pressure of 2-3 MPa and an output cooling water temperature of 15-30℃.

[0050] The oil temperature machine is responsible for delivering heating oil to the fixed mold, movable mold, injection cylinder and injection punch for heating, and the cooling water pump is responsible for delivering high-pressure cooling water to the fixed mold, movable mold, injection cylinder and injection punch for cooling. Therefore, the oil temperature machine and the cooling water pump are important equipment for mold temperature control. Due to the large size of the large-scale die casting mold, the projected area is also large, and during the die casting production process, the temperature of the fixed mold, movable mold, injection cylinder and injection punch will rise sharply under the impact of high-temperature aluminum alloy liquid. However, during mold opening and part taking and spraying of release agent, the temperature of the fixed mold, movable mold, injection cylinder and injection punch will drop sharply, so that the temperature of the fixed mold, movable mold, injection cylinder and injection punch is in a state of sharp fluctuation. Therefore, in order to achieve fast heating and fast cooling of the fixed mold, movable mold, injection cylinder and injection punch, the selection of the oil temperature machine and the cooling water pump is crucial. If the power of the oil temperature machine is small, the temperature of the heating oil is low, the flow rate is small or the pressure is too small, it will not be able to achieve fast heating of the fixed mold, movable mold, injection cylinder and injection punch to maintain sufficient temperature. If the power of the cooling water pump is small, the flow rate of the cooling water is small, the pressure is insufficient or the temperature is too high, it will not be able to achieve fast cooling of the fixed mold, movable mold, injection cylinder and injection punch. Therefore, it is necessary to strictly control the output heating oil temperature, flow rate and pressure of the oil temperature machine and the output cooling water flow rate, pressure and temperature of the cooling water pump, otherwise it will not be able to achieve precise control of the temperature of the fixed mold, movable mold, injection cylinder and injection punch.

[0051] As preferred, the fixed mold 8 and the movable mold 9 are respectively divided into different temperature control areas, and each temperature control area is respectively provided with a mold temperature acquisition unit 2, a heating oil channel 19 and a cooling water channel 20. The heating oil channel 19 is connected with the oil temperature machine 3 through the heating oil pipeline 4, and the cooling water channel 20 is connected with the cooling water pump 5 through the cooling water pipeline 7. The temperature acquisition, heating and cooling of different temperature control areas on the fixed mold 8 and the movable mold 9 are realized through the mold temperature acquisition unit 2, the heating oil channel 19 and the cooling water channel 20.

[0052] Since the large mold has large size and complex structure, in order to ensure that the aluminum alloy liquid can be smoothly filled into the mold cavity and sequentially solidified, and prevent the solidification shrinkage of the aluminum alloy liquid from causing the deformation, shrinkage hole and porosity and other defects of the die casting, the temperature of different areas on the fixed mold and the movable mold needs to be strictly controlled. In order to accurately control the mold temperature, first, different temperature control areas need to be divided on the fixed mold and the movable mold. The number of temperature control areas can be determined according to the area of the parting surface. As preferred, the number of temperature control areas is 16-20 per square meter. Too many temperature control areas will increase the number of heating oil channels, cooling water channels, oil temperature machines and cooling water pumps, increase the difficulty of equipment layout and production cost. Too few temperature control areas will make it difficult to accurately control the mold temperature. Secondly, the temperature control range of each temperature control area needs to be reasonably set. The temperature control range can be determined in combination with the filling temperature of the aluminum alloy liquid, the shape structure characteristics of the die casting and the wall thickness of the die casting. Too high temperature setting will increase the solidification time of the aluminum alloy liquid, reduce the production efficiency, and at the same time cause the deformation, shrinkage hole and porosity and other defects of the die casting. Too low temperature setting will cause the difficulty of filling of the aluminum alloy liquid, and the mold cavity cannot be filled to obtain a complete shape of the die casting. Finally, the mold temperature acquisition unit, the heating oil channel and the cooling water channel are respectively arranged in each temperature control area. The mold temperature of the area is acquired through the mold temperature acquisition unit, and the temperature control of the temperature control area is realized through the heating of the heating oil channel and the cooling of the cooling water channel.

[0053] As preferred, the injection cylinder 12 is provided with the mold temperature acquisition unit 2, the heating oil channel 19 and the cooling water channel 20. The temperature acquisition unit 2 is connected with the mold temperature controller 1 through the cable 15, the heating oil channel 19 is connected with the oil temperature machine 3 through the heating oil pipeline 4, and the cooling water channel 20 is connected with the cooling water pump 5 through the cooling water pipeline 7. The temperature control of the injection cylinder 12 is realized through the mold temperature acquisition unit 2, the heating oil channel 19 and the cooling water channel 20.

[0054] The injection cylinder absorbs the heat of the aluminum alloy liquid when containing the aluminum alloy liquid, so that the temperature of the aluminum alloy liquid is lowered, the temperature of the aluminum alloy liquid during injection filling is affected, and finally the filling state and solidification process of the aluminum alloy liquid are affected. In order to effectively control the filling state and solidification process of the aluminum alloy liquid and improve the rationality and accuracy of the mold temperature control, the mold temperature acquisition unit, the heating oil channel and the cooling water channel are arranged on the injection cylinder, the temperature of the injection cylinder is strictly controlled, the influence of the temperature change of the injection cylinder on the temperature of the aluminum alloy liquid is eliminated, the temperature stability and consistency of the aluminum alloy liquid during filling are improved, and the rationality and accuracy of the mold temperature control are improved.

[0055] As preferred, the injection punch 13 is provided with the mold temperature acquisition unit 2, the heating oil channel 19 and the cooling water channel 20, the mold temperature acquisition unit 2 is connected with the mold temperature controller 1 through the cable 15, the heating oil channel 19 is connected with the oil temperature machine 3 through the heating oil pipeline 4, the cooling water channel 20 is connected with the cooling water pump 5 through the cooling water pipeline 7, and the temperature of the injection punch 13 is controlled through the mold temperature acquisition unit 2, the heating oil channel 19 and the cooling water channel 20.

[0056] The injection punch is an important tool for pushing the aluminum alloy liquid to fill the mold cavity. During the process of pushing the aluminum alloy liquid to advance and fill, the heat of the aluminum alloy liquid will be continuously transferred to the injection punch, which will cause the temperature of the aluminum alloy liquid to drop on the one hand and the temperature of the injection punch to rise on the other hand, resulting in the expansion of the volume of the injection punch, the increase of the friction between the injection punch and the injection cylinder, and the difficulty of the injection punch to advance in the serious case, so that the aluminum alloy liquid cannot fill the mold cavity. In order to solve the above problems, the mold temperature acquisition unit, the heating oil channel and the cooling water channel are arranged on the injection punch, the temperature of the injection punch is controlled through the mold temperature acquisition unit, the heating oil channel and the cooling water channel, the fluctuation of the temperature of the injection punch is reduced to cause the fluctuation of the temperature of the aluminum alloy liquid, the stability and consistency of the temperature of the aluminum alloy liquid during injection filling are improved, the volume expansion of the injection punch is avoided, and it is ensured that the injection punch can smoothly push the aluminum alloy liquid to fill the mold cavity.

[0057] The second aspect of the present application provides a mold temperature control method of a large and complex die casting mold, which adopts the mold temperature control system, and sequentially includes the following steps:

[0058] Step one: setting the temperature control range of the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13 through the mold temperature controller 1 respectively;

[0059] Step two: starting the oil temperature machine 3 to deliver the heating oil to the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13 for heating through the mold temperature controller 1;

[0060] Step three: start the high pressure cooling water pump 5 to deliver high pressure cooling water to the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13 head through the mold temperature controller 1 to cool down;

[0061] Step four: when the temperature of the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13 reaches the respective temperature control range, start the die casting process;

[0062] Step five: when the die casting process is completed, turn off the oil temperature machine 3 and the cooling water pump 5 in sequence through the mold temperature controller 1 to stop heating and cooling of the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13, and end the mold temperature control process.

[0063] Preferably, the temperature control range of the fixed mold 8 and the movable mold 9 in step one is 330-380℃.

[0064] Because of the large size and complex structure of the large mold, in order to ensure that the aluminum alloy liquid can smoothly fill the mold cavity, and prevent the die casting from producing defects such as deformation, shrinkage and porosity, it is necessary to strictly control the temperature control range of the mold. If the mold temperature is set too high, the solidification time of the aluminum alloy liquid will be increased, the production efficiency will be reduced, and the die casting will produce defects such as deformation, shrinkage and porosity. If the mold temperature is set too low, the aluminum alloy liquid will be difficult to fill the mold cavity, and the complete die casting cannot be obtained.

[0065] Preferably, the temperature control range of the injection cylinder 12 in step one is 410-430℃.

[0066] The injection cylinder will absorb the heat of the aluminum alloy liquid, resulting in a decrease in the temperature of the aluminum alloy liquid. If the temperature of the injection cylinder is too low, the temperature of the aluminum alloy liquid in the injection cylinder will drop sharply, resulting in difficulty in filling the mold with the aluminum alloy liquid, and the complete die casting cannot be obtained. The temperature fluctuation of the injection cylinder also affects the temperature of the aluminum alloy liquid during injection, which ultimately affects the filling state and solidification process of the aluminum alloy liquid. In order to effectively control the filling state and solidification process of the aluminum alloy liquid, improve the rationality and accuracy of the mold temperature control, and reduce the influence of the temperature fluctuation of the injection cylinder on the temperature of the aluminum alloy liquid, it is necessary to strictly control the temperature of the injection cylinder.

[0067] Preferably, the temperature control range of the injection punch 13 in step one is 180-200℃.

[0068] The injection punch directly contacts the aluminum alloy liquid and absorbs the heat of the aluminum alloy liquid, causing the temperature of the aluminum alloy liquid to drop. Meanwhile, the temperature rise of the injection punch causes the volume of the injection punch to expand, which increases the friction between the injection punch and the injection cylinder, affecting the smooth progress of the injection process. In severe cases, it can cause the push rod to advance with difficulty, unable to push the aluminum alloy liquid forward and fill the mold cavity. In order to reduce the temperature drop of the aluminum alloy liquid caused by the too low injection punch and the injection difficulty caused by the too high temperature of the injection punch, the temperature of the injection punch needs to be strictly controlled.

[0069] As preferred, the heating time of the oil temperature machine 3 for delivering the heated oil to the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13 for heating in step two is not less than 30 minutes.

[0070] As preferred, the cooling time of the cooling water pump 5 for delivering the high-pressure cooling water to the fixed mold 8, the movable mold 9, the injection cylinder 12 and the injection punch 13 for cooling in step three is not less than 30 minutes.

[0071] Since the die casting machine is just started, the fixed mold core, the movable mold core, the injection cylinder and the injection punch are all in a cold state at this time, therefore, the oil temperature machine is started first to heat the mold core, the movable mold core, the injection cylinder and the injection punch, and the heating time cannot be less than 30 minutes, so that the temperature of the fixed mold core, the movable mold core, the injection cylinder and the injection punch is high enough. Then enter step three to start the cooling water pump to deliver high-pressure cooling water to the fixed mold core, the movable mold core, the injection cylinder and the injection punch for cooling, and the cooling time should also be not less than 30 minutes, so that the temperature of the fixed mold core, the movable mold core, the injection cylinder and the injection punch gradually enters the respective temperature control range, and then the die casting process begins.

[0072] The present application is described by examples, but does not limit the present application. Referring to the description of the present application, other changes of the disclosed examples are easily thought by those skilled in the art, and such changes should belong to the scope defined by the claims of the present application.

Claims

1. A mold temperature control method for a large complex die casting mold, characterized by, The mold temperature control system comprises a mold temperature controller, a mold temperature acquisition unit, an oil temperature machine, a heating oil pipeline, a cooling water pump, a cooling water tank, a cooling water pipeline, a fixed mold, a movable mold, a fixed mold plate, a movable mold plate, a injection cylinder, an injection punch, a pipeline integration plate and a cable. The mold temperature acquisition unit is a platinum-rhodium thermocouple with a diameter of 1-2 mm. The method comprises the following steps in sequence: Step one: setting the temperature control range of the fixed mold, the movable mold, the injection cylinder and the injection punch through the mold temperature controller; Step two: starting the oil temperature machine to deliver heating oil to the fixed mold, the movable mold, the injection cylinder and the injection punch for heating through the mold temperature controller; Step three: starting the cooling water pump to deliver high-pressure cooling water to the fixed mold, the movable mold, the injection cylinder and the injection punch for cooling through the mold temperature controller; Step four: starting the die casting process when the temperature of the fixed mold, the movable mold, the injection cylinder and the injection punch reaches the respective temperature control range; Step five: sequentially closing the oil temperature machine and the cooling water pump to stop heating and cooling of the fixed mold, the movable mold, the injection cylinder and the injection punch through the mold temperature controller when the die casting process is completed, and ending the mold temperature control process; The temperature control range of the fixed mold and the movable mold is 330-380℃, the temperature control range of the injection cylinder is 410-430℃, and the temperature control range of the injection punch is 180-200℃. ​ ​ ​ The heating time of the oil temperature machine for delivering heated oil to the fixed mold, movable mold, injection cylinder and injection punch is not less than 30 minutes, and the cooling time of the cooling water pump for delivering high-pressure cooling water to the fixed mold, movable mold, injection cylinder and injection punch is not less than 30 minutes.

2. The mold temperature control method for a large and complex die casting mold according to claim 1, characterized by, The power of the oil temperature machine is 25-30 kW, the temperature of the output heated oil is 200-400 DEG C, the output flow of the heated oil is 80-100 L / min, and the pressure of the output heated oil is 0.5-1 MPa.

3. The mold temperature control method for a large and complex die casting mold according to claim 1, characterized by, The power of the cooling water pump is 10-15 kW, the output flow of the cooling water is 120-150 L / min, the pressure of the output cooling water is 2-3 MPa, and the temperature of the output cooling water is 15-30 DEG C.

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