Die temperature control system and method for large complex die-casting die

Abstract

The invention discloses a mold temperature control system and method for a large complex die-casting mold, and the system comprises a mold temperature controller, a mold temperature collection 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, an injection charging barrel, an injection punch, a pipeline integrated board, and a cable. The mold temperature controller is responsible for managing mold temperature control equipment in a centralized mode, the mold temperature collecting unit is responsible for collecting the temperature of the fixed mold core, the movable mold core, the injection charging barrel and the injection punch, the oil temperature machine is responsible for conveying heating oil, and the cooling water pump is responsible for conveying high-pressure cooling water. Through software and hardware integrated control of the die temperature control equipment, the problems of dispersed layout, poor coordination, low working efficiency and the like of the die temperature control equipment are solved, the process management and control capability of die temperature control is improved, real-time and accurate control of the die temperature is realized, the defects of deformation, shrinkage cavities, looseness and the like of die castings are reduced, and the die casting quality is improved. And the size stability and the qualified rate of the large complex die casting are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of die casting, and in particular relates to a mold temperature control system and method for a large and complex die casting mold. Background Art

[0002] Die casting is a molding technique that involves injecting molten aluminum alloy into a mold cavity at high speed and high pressure, followed by cooling and solidification to produce die-cast parts. Die casting boasts high production efficiency and the ability to form a wide variety of complex die-cast parts. It is widely used in the molding of components for automobiles, motorcycles, electronic appliances, and mechanical equipment. The mold is a crucial tool in die casting. Mold temperature directly influences the filling and solidification of the molten aluminum alloy, ultimately affecting the shape, size, and quality of the die-cast part. Improper mold temperature control can lead to defects such as deformation, shrinkage cavities, porosity, cold shuts, and flow lines in die-cast parts, rendering them scrapped.

[0003] With the development of new energy vehicles and the application of integrated die-casting technology, die-casting molds are becoming larger and more complex. The requirements for the shape, size, and performance of die-cast parts are becoming increasingly stringent, and therefore, the requirements for mold temperature control are also becoming increasingly stringent. Large and complex die-casting molds have numerous internal heating and cooling channels and temperature monitoring points, which in turn requires a large number of heating, cooling, and temperature monitoring equipment. The increase in mold temperature control equipment brings great difficulties to the design and layout of mold temperature control systems.

[0004] Literature review and production practice indicate that existing technologies typically employ independent control of each device. This leads to problems such as fragmented equipment layout, poor coordination, low efficiency, and poor mold temperature control accuracy. This results in serious problems such as deformation, shrinkage, and looseness in die castings, resulting in low pass rates and high scrap rates. Therefore, existing mold temperature control systems and methods for large, complex die casting molds still require improvement and development. Summary of the Invention

[0005] In response to the problems and shortcomings mentioned in the background technology, the present invention provides a mold temperature control system and method for large and complex die-casting molds. Through the integrated control of the software and hardware of the mold temperature control equipment, it solves the problems of scattered equipment layout, poor coordination, and low work efficiency, improves the process control capability of mold temperature control, realizes real-time and precise control of mold temperature, reduces deformation, shrinkage, looseness, etc. of die-castings, and improves the dimensional stability and pass rate of large and complex die-castings.

[0006] The technical solutions adopted by the present invention to achieve the above-mentioned purpose are as follows:

[0007] The first aspect of the present invention provides a mold temperature control system for a large and complex die-casting mold, which is characterized in that: the mold temperature control system includes 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 plate, a movable plate, an injection barrel, an injection punch, a pipeline integrated board and a cable, the mold temperature controller is connected to the mold temperature acquisition unit, the oil temperature machine and the cooling water pump through a cable, the mold temperature acquisition unit is respectively arranged on the fixed mold, the movable mold, the injection barrel and the injection punch, the oil temperature machine is connected to the fixed mold, the movable mold, the injection barrel and the injection punch through a heating oil pipeline The injection punch is connected, and the cooling water pump is connected to the cooling water tank, the fixed mold, the movable mold, the injection barrel and the injection punch through the cooling water pipeline. The fixed mold is installed on the fixed mold plate of the die-casting machine, and the movable mold is installed on the movable mold plate of the die-casting machine. The injection punch is arranged on the injection barrel, and the injection barrel is installed on the fixed mold plate of the die-casting machine. The pipeline integration plate is installed on the fixed mold plate and the movable mold plate of the die-casting machine. The pipeline integration plate brings together the heating oil pipelines between the fixed mold, the movable mold and the oil temperature machine, and the cooling water pipelines between the fixed mold, the movable mold and the cooling water pump. The fixed mold and the movable mold include a mold frame, a mold core and a mold cavity surface.

[0008] Preferably, the mold temperature controller has the function of displaying the switch status of the oil temperature machine and the cooling water pump, as well as the temperature setting, displaying and storing functions of the fixed mold, movable mold, injection barrel and injection punch.

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

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

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

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

[0013] Preferably, the injection barrel is provided with a mold temperature collection unit, a heating oil channel and a cooling water channel. The mold temperature collection unit is connected to the mold temperature controller via a cable, the heating oil channel is connected to the oil temperature machine via a heating oil pipeline, and the cooling water channel is connected to the cooling water pump via a cooling water pipeline.

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

[0015] A second aspect of the present invention provides a method for controlling the mold temperature of a large and complex die-casting mold. The method adopts the above-mentioned mold temperature control system and is characterized by sequentially comprising the following steps:

[0016] Step 1: Use the mold temperature controller to set the temperature control range of the fixed mold, movable mold, injection barrel and injection punch respectively;

[0017] Step 2: Start the oil temperature machine through the mold temperature controller to deliver heating oil to the fixed mold, movable mold, injection barrel and injection punch for heating;

[0018] Step 3: Start the cooling water pump through the mold temperature controller to deliver high-pressure cooling water to the fixed mold, movable mold, injection barrel and injection punch for cooling;

[0019] Step 4: When the temperatures of the fixed mold, movable mold, injection barrel and injection punch reach their respective temperature control ranges, the die casting process begins;

[0020] Step 5: When the die-casting process is completed, the mold temperature controller turns off the oil temperature machine and the cooling water pump in sequence, stops heating and cooling the fixed mold, movable mold, injection barrel, and injection punch, and ends the mold temperature control process.

[0021] Preferably, the temperature control range of the fixed mold and the movable mold in step 1 is 330-380°C.

[0022] Preferably, the temperature control range of the injection barrel in step 1 is 410-430°C.

[0023] Preferably, the temperature control range of the injection punch in step 1 is 180-200°C.

[0024] Preferably, in step 2, the heating time of starting the oil temperature machine to deliver heating oil to the fixed mold, movable mold, injection barrel and injection punch for heating is not less than 30 minutes.

[0025] Preferably, the cooling time for starting the cooling water pump in step 3 to deliver high-pressure cooling water to the fixed mold, movable mold, injection barrel and injection punch for cooling is not less than 30 minutes.

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

[0027] (1) The present invention solves the problems of scattered layout, poor coordination, and low work efficiency of temperature control equipment by integrating the software and hardware of numerous mold temperature control devices. The heating and cooling processes of the fixed mold, movable mold, injection barrel, and injection punch are centrally controlled by the mold temperature controller, thereby strengthening the coordination between the devices and improving the process control capability of mold temperature control.

[0028] (2) The present invention divides different temperature control areas on the fixed mold and the movable mold, and respectively provides a mold temperature collection unit, a heating oil channel, and a cooling water channel on the injection barrel and the injection punch. The temperature of the die-casting mold, the injection barrel, and the injection punch is precisely controlled by temperature collection of the mold temperature collection unit, heating of the heating oil channel, and cooling of the cooling water channel.

[0029] (3) The present invention incorporates the temperature control of the injection barrel and the injection punch into the mold temperature control system, effectively reducing the influence of the temperature fluctuation of the injection barrel and the injection punch on the temperature of the aluminum alloy liquid during filling, improving the stability and consistency of the aluminum alloy liquid temperature during filling, and improving the rationality and accuracy of the mold temperature control;

[0030] (4) The present invention achieves 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. Through precise control of the mold temperature, the deformation, shrinkage, looseness, etc. of the die-casting parts can be effectively reduced, and the dimensional stability and qualified rate of large and complex die-casting parts can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the mold temperature control system of the present invention.

[0032] Figure 2 It is a structural schematic diagram of the movable mold of the present invention.

[0033] Figure 3 It is a schematic diagram of the front structure of the movable mold of the present invention.

[0034] Figure 4 It is a schematic diagram of the partial cross-sectional structure of the movable mold of the present invention.

[0035] Figure 5 It is a schematic diagram of the cross-sectional structure of the injection barrel of the present invention.

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

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

[0038] like Figures 1-6As shown, a mold temperature control system for a large and complex die-casting mold includes 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 plate 10, a movable plate 11, an injection barrel 12, an injection punch 13, a pipeline integrated board 14 and a cable 15.

[0039] The mold temperature controller 1 is connected to the mold temperature collection unit 2, the oil temperature machine 3 and the cooling water pump 5 via a cable 15. It is responsible for receiving temperature data from the mold temperature collection unit 2 and controlling the opening and closing actions of the oil temperature machine 3 and the cooling water pump 5, thereby realizing centralized management of the mold temperature control equipment.

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

[0041] The oil temperature controller 3 is connected to the fixed mold 8, the movable mold 9, the injection barrel 12 and the injection punch 13 through the heating oil pipeline 4, and is responsible for delivering heating oil to the fixed mold 8, the movable mold 9, the injection barrel 12 and the injection punch 13, thereby heating the fixed mold 8, the movable mold 9, the injection barrel 12 and the injection punch 13 and recovering the heating oil.

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

[0043] The fixed die 8 is mounted on a fixed die plate 10 of the die casting machine, the movable die 9 is mounted on a movable die plate 11 of the die casting machine, the injection punch 13 is arranged on an injection barrel 12, and the injection barrel 12 is mounted on the fixed die plate 10 of the die casting machine.

[0044] The pipeline integration plate 14 is installed on the fixed mold 10 and the movable mold 11 of the die-casting machine. The pipeline integration plate 14 brings together 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 include a mold frame 16 , a mold core 17 and a mold cavity surface 18 .

[0046] Preferably, the mold temperature controller 1 has the function of displaying the switch status of the oil temperature machine 3 and the cooling water pump 5, as well as the temperature setting, displaying and storing functions of the fixed mold 8, the movable mold 9, the injection barrel 12 and the injection punch 13.

[0047] Preferably, the mold temperature acquisition unit 2 is a platinum-rhodium thermocouple with a diameter of 1-2 mm. Small-diameter platinum-rhodium thermocouples have the advantages of fast temperature acquisition response, high accuracy, and long service life. To achieve rapid and accurate mold temperature acquisition, a platinum-rhodium thermocouple with a diameter of 1-2 mm is preferably selected.

[0048] Preferably, the power of the oil temperature machine 3 is 25-30kW, the temperature of the output heating oil is 200-400°C, the output flow rate of the heating oil is 80-100L / min, and the pressure of the output heating oil is 0.5-1MPa.

[0049] Preferably, the power of the cooling water pump 5 is 10-15 kW, the output flow rate of cooling water is 120-150 L / min, the output pressure of cooling water is 2-3 MPa, and the output temperature of cooling water is 15-30°C.

[0050] The oil temperature controller is responsible for supplying heating oil to the fixed die, movable die, injection barrel, and injection punch for heating, while the cooling water pump is responsible for supplying high-pressure cooling water to these three areas for cooling. Therefore, the oil temperature controller and cooling water pump are crucial for mold temperature control. Due to the large size and projected area of large die-casting molds, the temperatures of these three areas, including the fixed die, movable die, injection barrel, and injection punch, rise dramatically during the die-casting process due to the impact of high-temperature aluminum alloy liquid. However, during mold opening, part removal, and mold release agent spraying, these temperatures drop dramatically, causing these three areas to experience drastic temperature fluctuations. Therefore, the selection of the oil temperature controller and cooling water pump is crucial to achieving rapid heating and cooling of the fixed die, movable die, injection barrel, and injection punch. If the oil temperature controller has low power, low heating oil temperature, low flow rate, or too low pressure, it will not be possible to quickly heat the fixed mold, movable mold, injection barrel, and injection punch to maintain a sufficient temperature. If the cooling water pump has low power, low cooling water flow rate, insufficient pressure, or too high temperature, it will not be possible to quickly cool down the fixed mold, movable mold, injection barrel, and injection punch. Therefore, the heating oil temperature, flow rate, and pressure output by the oil temperature controller, as well as the cooling water flow rate, pressure, and temperature output by the cooling water pump, must be strictly controlled. Otherwise, it will be impossible to accurately control the temperature of the fixed mold, movable mold, injection barrel, and injection punch.

[0051] Preferably, 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 collection unit 2, a heating oil channel 19 and a cooling water channel 20. The heating oil channel 19 is connected to the oil temperature machine 3 through the heating oil pipeline 4, and the cooling water channel 20 is connected to the cooling water pump 5 through the cooling water pipeline 7. The mold temperature collection unit 2, the heating oil channel 19 and the cooling water channel 20 are used to realize temperature collection, heating and cooling of different temperature control areas on the fixed mold 8 and the movable mold 9.

[0052] Due to the large size and complex structure of large molds, strict temperature control of different zones within the fixed and movable molds is necessary to ensure smooth filling of the mold cavity and orderly solidification of the molten aluminum alloy, while also preventing solidification shrinkage of the molten aluminum alloy from causing defects such as deformation, shrinkage cavities, and porosity in the die-casting. To precisely control the mold temperature, the fixed and movable molds must first be divided into distinct temperature-controlled zones. The number of temperature-controlled zones can be determined based on the area of the parting surface; preferably, 16-20 zones per square meter are used. Excessive temperature-controlled zones increase the number of heating oil and cooling water channels, as well as the number of oil temperature controllers and cooling water pumps, complicating equipment layout and increasing production costs. Too few temperature-controlled zones make precise mold temperature control difficult. Secondly, it is crucial to appropriately set the temperature control range for each zone. The temperature control range should be determined based on factors such as the molten aluminum alloy filling temperature, the die-casting's geometry and structural characteristics, and the wall thickness of the die-casting. Setting the temperature too high increases the solidification time of the molten aluminum alloy, reduces production efficiency, and can lead to defects such as deformation, shrinkage cavities, and porosity in the die-casting. Setting the temperature too low will make it difficult for the aluminum alloy liquid to fill the mold, preventing it from completely filling the mold cavity and producing a fully formed die-cast part. Finally, a mold temperature acquisition unit, heating oil channels, and cooling water channels are installed in each temperature-controlled area. The mold temperature in that area is collected by the mold temperature acquisition unit, and the temperature of the temperature-controlled area is controlled by heating the heating oil channels and cooling the cooling water channels.

[0053] Preferably, the injection barrel 12 is provided with a mold temperature collection unit 2, a heating oil channel 19 and a cooling water channel 20. The temperature collection unit 2 is connected to the mold temperature controller 1 through a cable 15, the heating oil channel 19 is connected to the oil temperature machine 3 through a heating oil pipeline 4, and the cooling water channel 20 is connected to the cooling water pump 5 through a cooling water pipeline 7. The temperature of the injection barrel 12 is controlled by the mold temperature collection unit 2, the heating oil channel 19 and the cooling water channel 20.

[0054] When holding aluminum alloy liquid, the injection barrel absorbs its heat, causing the temperature of the liquid to drop, affecting its temperature during injection molding and ultimately affecting its filling state and solidification process. To effectively control the filling state and solidification process of the aluminum alloy liquid and improve the rationality and accuracy of mold temperature control, the present invention provides a mold temperature acquisition unit, heating oil channels, and cooling water channels on the injection barrel. These strictly control the temperature of the injection barrel, eliminate the impact of the injection barrel's temperature changes on the aluminum alloy liquid's temperature, improve the temperature stability and consistency of the aluminum alloy liquid during mold filling, and enhance the rationality and accuracy of mold temperature control.

[0055] Preferably, the injection punch 13 is provided with a mold temperature acquisition unit 2, a heating oil channel 19 and a cooling water channel 20. The mold temperature acquisition unit 2 is connected to the mold temperature controller 1 through a cable 15, the heating oil channel 19 is connected to the oil temperature machine 3 through the heating oil pipeline 4, and the cooling water channel 20 is connected to the cooling water pump 5 through the cooling water pipeline 7. The temperature of the injection punch 13 is controlled by 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 forward and filling, 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 on the other hand, it will cause the temperature of the injection punch to rise, causing the volume of the injection punch to expand, increasing the friction between the injection punch and the injection barrel. In severe cases, it will cause the injection punch to move forward with difficulty and be unable to push the aluminum alloy liquid to fill the mold cavity. In order to solve the above problems, the present invention sets a mold temperature acquisition unit, a heating oil channel and a cooling water channel on the injection punch, and controls the temperature of the injection punch through the mold temperature acquisition unit, the heating oil channel and the cooling water channel, reduces the fluctuation of the temperature of the aluminum alloy liquid caused by the fluctuation of the injection punch temperature, improves the stability and consistency of the temperature of the aluminum alloy liquid during injection filling, avoids the volume expansion of the injection punch, and ensures that the injection punch can smoothly push the aluminum alloy liquid to fill the mold cavity.

[0057] A second aspect of the present invention provides a method for controlling the mold temperature of a large and complex die-casting mold. The method adopts the above-mentioned mold temperature control system and comprises the following steps in sequence:

[0058] Step 1: Use the mold temperature controller 1 to set the temperature control ranges of the fixed mold 8, the movable mold 9, the injection barrel 12, and the injection punch 13 respectively;

[0059] Step 2: Start the oil temperature controller 3 through the mold temperature controller 1 to deliver heating oil to the fixed mold 8, movable mold 9, injection barrel 12 and injection punch 13 for heating;

[0060] Step 3: Start the cooling water pump 5 through the mold temperature controller 1 to deliver high-pressure cooling water to the fixed mold 8, movable mold 9, injection barrel 12 and injection punch 13 for cooling;

[0061] Step 4: When the temperatures of the fixed mold 8, the movable mold 9, the injection barrel 12 and the injection punch 13 reach their respective temperature control ranges, the die casting process begins;

[0062] Step 5: After the die-casting process is completed, the oil temperature controller 3 and the cooling water pump 5 are turned off in sequence through the mold temperature controller 1, and the heating and cooling of the fixed mold 8, the movable mold 9, the injection barrel 12, and the injection punch 13 are stopped, and the mold temperature control process is ended.

[0063] Preferably, in step 1, the temperature control range of the fixed mold 8 and the movable mold 9 is 330-380°C.

[0064] Due to the large size and complex structure of large molds, strict mold temperature control is required to ensure that the aluminum alloy liquid can smoothly fill the mold cavity while preventing defects such as deformation, shrinkage, and porosity in the die-casting. Setting the mold temperature too high will increase the solidification time of the aluminum alloy liquid, reduce production efficiency, and cause defects such as deformation, shrinkage, and porosity in the die-casting. Setting the mold temperature too low will make it difficult for the aluminum alloy liquid to fill the mold cavity, resulting in an incomplete die-casting.

[0065] Preferably, the temperature control range of the injection barrel 12 in step 1 is 410-430°C.

[0066] The injection barrel absorbs heat from the aluminum alloy liquid, causing its temperature to drop. If the barrel temperature is too low, the temperature of the aluminum alloy liquid inside the barrel will drop sharply, making it difficult to fill the mold and preventing the production of fully filled die-cast parts. Furthermore, the temperature fluctuations of the barrel affect the temperature of the aluminum alloy liquid during filling, ultimately affecting 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 mold temperature control, and reduce the impact of barrel temperature fluctuations on the temperature of the aluminum alloy liquid, the barrel temperature must be strictly controlled.

[0067] Preferably, the temperature control range of the injection punch 13 in step 1 is 180-200°C.

[0068] The injection punch comes into direct contact with the aluminum alloy liquid and absorbs its heat, causing the temperature of the aluminum alloy liquid to drop. Simultaneously, the temperature rise of the injection punch causes its volume to expand, increasing the friction between the injection punch and the injection barrel, affecting the smooth progress of the injection process. In severe cases, it can cause the push rod to have difficulty advancing, making it impossible to push the aluminum alloy liquid forward and fill the mold cavity. In order to reduce the risk of a sharp drop in the aluminum alloy liquid temperature caused by the injection punch being too low, and the difficulty in injection caused by the injection punch being too high, the injection punch temperature must be strictly controlled.

[0069] Preferably, in step 2, the oil temperature controller 3 is started to deliver heating oil to the fixed mold 8, the movable mold 9, the injection barrel 12 and the injection punch 13 for heating for a heating time of not less than 30 minutes.

[0070] Preferably, the cooling time for starting the cooling water pump 5 in step 3 to deliver high-pressure cooling water to the fixed mold 8, the movable mold 9, the injection barrel 12 and the injection punch 13 for cooling is not less than 30 minutes.

[0071] Since the fixed mold core, movable mold core, injection barrel and injection punch are all in a cold state when the die casting machine is just started, the oil temperature machine is started first to heat the mold core, movable mold core, injection barrel and injection punch. The heating time cannot be less than 30 minutes so that the temperature of the fixed mold core, movable mold core, injection barrel and injection punch rises high enough. Then proceed to step 3 to start the cooling water pump to deliver high-pressure cooling water to the fixed mold core, movable mold core, injection barrel and injection punch for cooling. The cooling time should also be no less than 30 minutes so that the temperature of the fixed mold core, movable mold core, injection barrel and injection punch gradually enters their respective temperature control ranges before starting the die casting process.

[0072] The present invention is described through embodiments, but does not constitute a limitation of the present invention. With reference to the description of the present invention, other changes to the disclosed embodiments are easy for professionals in this field to think of, and such changes should fall within the scope defined by the claims of the present invention.

Claims

1. A mold temperature control system for a large and complex die-casting mold, characterized in that: The mold temperature control system includes a mold temperature controller, a mold temperature collection 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 plate, a movable plate, an injection barrel, an injection punch, a pipeline integrated board and a cable. The mold temperature controller is connected to the mold temperature collection unit, the oil temperature machine and the cooling water pump through cables. The mold temperature collection unit is respectively arranged on the fixed mold, the movable mold, the injection barrel and the injection punch. The oil temperature machine is connected to the fixed mold, the movable mold, the injection barrel and the injection punch through a heating oil pipeline. The cooling water pump is connected to the fixed mold, the movable mold, the injection barrel and the injection punch through a cooling water tank. The cooling water pipeline is connected to the cooling water tank, fixed mold, movable mold, injection barrel and injection punch. The fixed mold is installed on the fixed mold plate of the die-casting machine, and the movable mold is installed on the movable mold plate of the die-casting machine. The injection punch is arranged on the injection barrel, and the injection barrel is installed on the fixed mold plate of the die-casting machine. The pipeline integration plate is installed on the fixed mold plate and the movable mold plate of the die-casting machine. The pipeline integration plate brings together the heating oil pipelines between the fixed mold, movable mold and oil temperature machine, and the cooling water pipelines between the fixed mold, movable mold and cooling water pump. The fixed mold and movable mold include a mold frame, a mold core and a mold cavity surface.

2. The mold temperature control system for a large and complex die-casting mold according to claim 1, characterized in that: The mold temperature collection unit is a platinum-rhodium thermocouple with a diameter of 1-2 mm.

3. The mold temperature control system for a large and complex die-casting mold according to claim 1, characterized in that: The power of the oil temperature machine is 25-30kW, the temperature of the output heating oil is 200-400°C, the output flow rate of the heating oil is 80-100L / min, and the pressure of the output heating oil is 0.5-1MPa.

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

5. The mold temperature control system for a large and complex die-casting mold according to claim 1, characterized in that: The fixed mold and the movable mold are respectively divided into different temperature control areas, and each temperature control area is respectively provided with a mold temperature collection unit, a heating oil channel and a cooling water channel. The heating oil channel is connected to the oil temperature machine through a heating oil pipeline, and the cooling water channel is connected to the cooling water pump through a cooling water pipeline.

6. The mold temperature control system for a large and complex die-casting mold according to claim 1, characterized in that: The injection barrel is provided with a mold temperature collection unit, a heating oil channel and a cooling water channel. The mold temperature collection unit is connected to the mold temperature controller through a cable, the heating oil channel is connected to the oil temperature machine through a heating oil pipeline, and the cooling water channel is connected to the cooling water pump through a cooling water pipeline.

7. The mold temperature control system for a large and complex die-casting mold according to claim 1, characterized in that: The injection punch is provided with a mold temperature collection unit, a heating oil channel and a cooling water channel. The mold temperature collection unit is connected to the mold temperature controller through a cable, the heating oil channel is connected to the oil temperature machine through a heating oil pipeline, and the cooling water channel is connected to the cooling water pump through a cooling water pipeline.

8. A method for controlling the mold temperature of a large and complex die-casting mold, the method using the mold temperature control system of a large and complex die-casting mold according to any one of claims 1 to 7, characterized in that: The following steps are included in sequence: Step 1: Use the mold temperature controller to set the temperature control range of the fixed mold, movable mold, injection barrel and injection punch respectively; Step 2: Start the oil temperature machine through the mold temperature controller to deliver heating oil to the fixed mold, movable mold, injection barrel and injection punch for heating; Step 3: Start the cooling water pump through the mold temperature controller to deliver high-pressure cooling water to the fixed mold, movable mold, injection barrel and injection punch for cooling; Step 4: When the temperatures of the fixed mold, movable mold, injection barrel and injection punch reach their respective temperature control ranges, the die casting process begins; Step 5: When the die-casting process is completed, the mold temperature controller turns off the oil temperature machine and the cooling water pump in sequence, stops heating and cooling the fixed mold, movable mold, injection barrel, and injection punch, and ends the mold temperature control process.

9. The mold temperature control method for a large and complex die-casting mold according to claim 8, characterized in that: In step 1, the temperature control range of the fixed mold and the movable mold is 330-380°C, the temperature control range of the injection barrel is 410-430°C, and the temperature control range of the injection punch is 180-200°C.

10. The mold temperature control method for a large complex die-casting mold according to claim 8, characterized in that: The heating time of starting the oil temperature machine in step 2 to deliver heating oil to the fixed mold, movable mold, injection barrel and injection punch for heating is not less than 30 minutes, and the cooling time of starting the cooling water pump in step 3 to deliver high-pressure cooling water to the fixed mold, movable mold, injection barrel and injection punch for cooling is not less than 30 minutes.

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