A die casting extrusion control method and system

Abstract

The present invention provides a die-casting extrusion control method and system, which relates to the field of die-casting technology. The method includes determining the grade of the extrusion pin according to the structural data of the cavity and the position information of the extrusion pin, and a plurality of extrusion pins are arranged on the movable mold and the fixed mold of the die-casting mold; when the die-casting starts, one end of the extrusion pin is controlled to enter the cavity, the exhaust device is controlled to start, and the real-time temperature distribution diagram in the cavity is obtained; according to the real-time temperature distribution diagram and the position information of the extrusion pin, the extrusion pin is controlled to move in the direction away from the cavity; according to the real-time temperature distribution diagram, the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extension line of the extrusion pin axis is analyzed; according to the temperature difference and the grade of the extrusion pin, the pressure of the extrusion pin and the temperature of the heating element are controlled, and the heating element is set corresponding to the extrusion pin. The heating element is controlled to keep the metal plastic, and the extrusion pin is controlled to apply pressure to compensate for the volume difference caused by cold shrinkage, so as to avoid the generation of shrinkage or shrinkage cavity.

Description

Technical Field

[0001] The present invention relates to the field of die casting technology, and in particular to a die casting extrusion control method and system. Background Art

[0002] Die casting is a metal forming process that is mainly used to inject molten metal into a mold under high pressure to obtain precision metal parts. Commonly used metal materials include aluminum, zinc, magnesium, etc.

[0003] However, die-cast metal parts sometimes have certain defects, such as shrinkage cavities and shrinkage, which lead to a decrease in the quality of the die-cast products. Summary of the invention

[0004] The problem to be solved by the present invention is how to improve the quality of die-casting parts.

[0005] To solve the above problems, in a first aspect, the present invention provides a die casting extrusion control method, comprising:

[0006] Acquire structural data of the cavity and position information of the extrusion pins, wherein the cavity is formed by a movable die and a fixed die of the die-casting mold, and a plurality of the extrusion pins are disposed on both the movable die and the fixed die;

[0007] Determining the grade of the extrusion pin according to the structural data of the cavity and the position information of the extrusion pin;

[0008] When die casting starts, one end of the extrusion pin is controlled to enter the cavity, the air extraction device is controlled to start, and a real-time temperature distribution diagram in the cavity is obtained, wherein the air extraction device is connected to the air extraction hole on the fixed mold;

[0009] According to the real-time temperature distribution diagram and the position information of the extrusion pin, controlling the extrusion pin to move in a direction away from the cavity;

[0010] According to the real-time temperature distribution diagram, the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extrusion pin axis is analyzed, wherein the inner wall of the cavity is equidistantly offset toward the center of the cavity by a specified distance to obtain a dividing line, the area between the dividing line and the inner wall of the cavity is the outer layer, and the area surrounded by the dividing line is the inner layer;

[0011] The pressure of the extrusion pin and the temperature of the heating element are controlled according to the temperature difference and the grade of the extrusion pin, wherein a plurality of the heating elements are arranged in the movable mold and the fixed mold, and the heating elements are arranged corresponding to the extrusion pins.

[0012] Optionally, determining the grade of the extrusion pin according to the structural data of the cavity and the position information of the extrusion pin comprises:

[0013] Based on the position information of the extrusion pin, the axis of the extrusion pin is extended to obtain an axis extension line;

[0014] Based on the structural data of the cavity, two intersection points of the axis extension line and the inner wall of the cavity are determined, and the distance between the two intersection points is measured to obtain the thickness of the die-cast part at the position of each extrusion pin;

[0015] The grade of the extrusion pin is determined according to the thickness of the die-cast part corresponding to each extrusion pin and the preset thickness range, wherein the multiple grades of the extrusion pin correspond one-to-one to the multiple preset thickness ranges.

[0016] Optionally, controlling the extrusion pin to move in a direction away from the cavity according to the real-time temperature distribution map and the position information of the extrusion pin comprises:

[0017] According to the real-time temperature distribution diagram, liquid level position information of the molten metal in the cavity is obtained;

[0018] Determining whether the liquid level of the molten metal is higher than the position of the extrusion pin according to the liquid level position information and the position information of the extrusion pin;

[0019] When the liquid level of the molten metal is higher than the position of the extrusion pin, the extrusion pin is controlled to move in a direction away from the cavity.

[0020] Optionally, when the liquid level of the molten metal is higher than the position of the extrusion pin, controlling the extrusion pin to move in a direction away from the cavity comprises:

[0021] When the liquid level of the molten metal is higher than the position of the extrusion pin, for the extrusion pin located below the liquid level of the molten metal, the retraction distance corresponding to the grade of the extrusion pin is called, and the extrusion pin is controlled to move out of the cavity until the distance between one end of the extrusion pin close to the cavity and the inner wall of the cavity reaches the retraction distance, wherein different grades of the extrusion pin correspond to different retraction distances.

[0022] Optionally, analyzing the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extrusion pin axis according to the real-time temperature distribution diagram includes:

[0023] Based on the real-time temperature distribution diagram, extracting a plurality of outer layer temperatures and a plurality of inner layer temperatures on an extended axis line of each extrusion pin;

[0024] According to the multiple outer layer temperatures corresponding to the extrusion pin, an outer layer average temperature and an outer layer minimum temperature corresponding to the extrusion pin are obtained;

[0025] According to the multiple inner layer temperatures corresponding to the extrusion pin, the highest inner layer temperature corresponding to the extrusion pin is obtained;

[0026] Determine whether the outer layer minimum temperature corresponding to the extrusion pin is less than a preset outer layer temperature;

[0027] When the outer layer minimum temperature corresponding to the extrusion pin is greater than or equal to the preset outer layer temperature, the temperature difference corresponding to the extrusion pin is obtained by subtracting the outer layer average temperature from the inner layer maximum temperature.

[0028] Optionally, after determining whether the outer layer minimum temperature corresponding to the extrusion pin is less than a preset outer layer temperature, the die-casting extrusion control method further includes:

[0029] When the lowest temperature of the outer layer corresponding to the extrusion pin is lower than the preset outer layer temperature, at least one of the heating elements corresponding to the extrusion pin is controlled to be powered on, and heating timing is performed to obtain a heating time;

[0030] When the heating time is longer than the preset time, and the outer layer minimum temperature corresponding to the extrusion pin is still lower than the preset outer layer temperature, the power-on voltage of the heating element is increased or the number of the heating elements corresponding to the extrusion pin that are powered on is increased;

[0031] When the lowest temperature of the outer layer corresponding to the extrusion pin is greater than or equal to the preset outer layer temperature, the heating element corresponding to the extrusion pin is controlled to stop working.

[0032] Optionally, controlling the pressure of the extrusion pin and the temperature of the heating element according to the temperature difference and the grade of the extrusion pin comprises:

[0033] Determining whether the temperature difference is greater than a preset temperature difference;

[0034] When the temperature difference is greater than the preset temperature difference, the pressure of the extrusion pin is adjusted to a preset pressure corresponding to the grade of the extrusion pin according to the grade of the extrusion pin, wherein each grade of the extrusion pin corresponds to one preset pressure.

[0035] Optionally, after determining whether the temperature difference is greater than a preset temperature difference, the die-casting extrusion control method further includes:

[0036] When the temperature difference is greater than the preset temperature difference, the temperature difference is subtracted from the preset temperature difference to obtain the compensation temperature, and the heating element corresponding to the extrusion pin is controlled to be powered on, wherein the heating temperature of the heating element is half of the compensation temperature plus the average temperature of the outer layer.

[0037] Optionally, after determining whether the temperature difference is greater than a preset temperature difference, the die-casting extrusion control method further includes:

[0038] When the temperature difference corresponding to any one of the extrusion pins is greater than the preset temperature difference, the cooling device is controlled to operate, wherein the cooling device is connected to a cooling water channel, and the cooling water channel is provided at one end of the movable mold close to the parting surface or / and at one end of the fixed mold close to the parting surface.

[0039] In a second aspect, the present invention further provides a die-casting extrusion control system, comprising:

[0040] An initial data acquisition module, used to acquire structural data of the cavity and position information of the extrusion pins, wherein the movable mold and the fixed mold of the die-casting mold are fitted together to form the cavity, and a plurality of the extrusion pins are arranged on the movable mold and the fixed mold;

[0041] A grade confirmation module, used to determine the grade of the extrusion pin according to the structural data of the cavity and the position information of the extrusion pin;

[0042] A control module, used for controlling one end of the extrusion pin to enter the cavity and controlling the start of the air extraction device when the die casting starts, wherein the air extraction device is connected to the air extraction hole on the fixed mold;

[0043] A real-time data acquisition module, used to acquire a real-time temperature distribution diagram in the cavity;

[0044] The control module is further used to control the extrusion pin to move in a direction away from the cavity according to the real-time temperature distribution diagram and the position information of the extrusion pin;

[0045] A temperature analysis module, for analyzing the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extrusion pin axis according to the real-time temperature distribution diagram, wherein the inner wall of the cavity is equidistantly offset toward the center of the cavity by a specified distance to obtain a dividing line, the area between the dividing line and the inner wall of the cavity is the outer layer, and the area surrounded by the dividing line is the inner layer;

[0046] The control module is also used to control the pressure of the extrusion pin and the temperature of the heating element according to the temperature difference and the grade of the extrusion pin, wherein a plurality of the heating elements are arranged in the movable mold and the fixed mold, and the heating elements are arranged corresponding to the extrusion pins.

[0047] The beneficial effects of a die-casting extrusion control method and system provided by the present invention are:

[0048] The movable die and the fixed die of the die-casting mold are provided with a plurality of extrusion pins. The grades of the plurality of extrusion pins are determined according to the obtained structural data of the cavity and the position information of the extrusion pins, so as to facilitate the subsequent control of the extrusion pins at different positions of the die-casting parts. When the die-casting starts, one end of the extrusion pin is controlled to enter the cavity, and the exhaust device is controlled to start. The exhaust device is connected with the exhaust hole on the fixed die, and a negative pressure is first formed in the cavity to accelerate the speed at which the metal solution fills the cavity, balance the cooling process of various parts of the cavity, reduce the generation of internal stress, and obtain the real-time temperature distribution diagram in the cavity at the same time, monitor the injection of the metal solution and the internal temperature change of the metal solution during the cooling process; according to the real-time temperature distribution diagram and the position information of the extrusion pin, the extrusion pin is controlled to move away from the cavity, and the retraction of the extrusion pin forms a certain negative pressure in the cavity, and the precipitated air is moved to the extrusion pin. The die-cast parts are transferred in the guide hole, and the possible pores can be removed by reprocessing later, so as to further improve the quality and qualified rate of die-cast parts; according to the real-time temperature distribution diagram, the temperature difference between the outer temperature and the inner temperature in the cavity in the direction of the extension line of the extrusion pin axis is analyzed; multiple heating elements are arranged in the movable mold and the fixed mold, and the heating elements are arranged adjacent to the extrusion pins. According to the temperature difference and the grade of the extrusion pin, the pressure of the extrusion pin and the temperature of the heating element are controlled. The heating is started by controlling the heating element to keep the metal in the outer layer and the guide hole plastic, and the external pressure is applied by controlling the extrusion pin to force the outer layer to deform before the inner layer structure under the dual stress of internal stress and external pressure, and the excess metal in the guide hole is pressed into the cavity to compensate for the volume difference caused by cold shrinkage, thereby eliminating internal stress, avoiding shrinkage or shrinkage cavity, and improving the quality of die-cast parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic structural diagram of a die-casting mold provided by an embodiment of the present invention;

[0050] Figure 2 A schematic flow chart of a die-casting extrusion control method provided by an embodiment of the present invention;

[0051] Figure 3 A schematic diagram of a working state of a die-casting mold provided by an embodiment of the present invention;

[0052] Figure 4 A schematic diagram of heat exchange in a die-casting mold provided by an embodiment of the present invention;

[0053] Figure 5 It is a structural schematic diagram of a die-casting extrusion control system.

[0054] Description of reference numerals:

[0055] 1. Moving mold; 2. Fixed mold; 3. Exhaust hole; 4. Primary heating element; 5. Primary extrusion pin; 6. Secondary heating element; 7. Secondary extrusion pin; 8. Third-level heating element; 9. Third-level extrusion pin; 10. Gate; 11. Fixed mold heating element; 12. Fixed mold extrusion pin; 13. Gate heating element; 14. Punch; 15. Cooling water channel; 16. Parting line; 17. Inner layer; 18. Outer layer. DETAILED DESCRIPTION

[0056] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0057] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0058] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0059] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0060] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes, and are not used to limit the scope of these messages or information.

[0061] Figure 1A schematic diagram of the structure of a die-casting mold is shown. The die-casting mold includes a movable mold 1, a fixed mold 2, a heater, an extrusion pin, a gate 10 and a punch 14, wherein a cavity is formed after the movable mold 1 and the fixed mold 2 are fitted together, a gate 10 is provided on the fixed mold 2, and a punch 14 is slidably provided in the gate 10. The molten metal is poured from the gate 10, and the molten metal enters the cavity under the push of the punch 14. When the molten metal in the cavity is cooled, a die-cast part is obtained. However, sometimes when the wall thickness of the die-cast part is thick or the wall thickness varies greatly, shrinkage or shrinkage cavities are easily formed inside the cooled die-cast part. An extrusion pin and a heater are provided on the movable mold 1 and the fixed mold 2. The extrusion pin is provided in a place where the wall thickness varies greatly or the wall thickness is thick. The heater is provided close to the extrusion pin, and the heater is provided corresponding to the extrusion pin. One or more heaters may be provided near an extrusion pin, for example Figure 1 In the figure, the movable mold 1 is exemplarily provided with a primary heating element 4, a primary extrusion pin 5, a secondary heating element 6, a secondary extrusion pin 7, a tertiary heating element 8 and a tertiary extrusion pin 9, and the fixed mold 2 is provided with a fixed mold heating element 11, a fixed mold extrusion pin 12 and a gate heating element 13. A primary heating element 4 is correspondingly provided around the primary extrusion pin 5, two secondary heating elements 6 are correspondingly provided around the secondary extrusion pin 7, and two tertiary heating elements 8 are correspondingly provided around the tertiary extrusion pin 9. Some fixed mold extrusion pins 12 are correspondingly provided with a fixed mold heating element 11, and some fixed mold extrusion pins 12 are correspondingly provided with two fixed mold heating elements 11. In addition, the punch 14 can also be regarded as an extrusion pin, and multiple gate heating elements 13 can also be provided around the gate to match the punch 14. According to actual needs, more heating elements can be provided around different heating elements. Figure 1 The number of heating elements shown in the figure is not a limitation, but is only an exemplary display for ease of understanding. During the die casting process, the extrusion pins and heating elements at different positions can be controlled to work together according to the level and temperature changes of the molten metal in the cavity, thereby reducing the probability of defects in the die casting parts.

[0062] In addition, an exhaust hole 3 can be set at the highest point of the fixed mold 2, and the exhaust hole 3 is connected to the exhaust device. When the punch 14 presses the metal solution into the cavity, the exhaust device can be started at the same time to extract the gas in the cavity in time, thereby reducing the generation of pores on the surface of the die-cast parts. A cooling water channel 15 can also be set on the movable mold 1 and the fixed mold 2. The cooling water channel 15 is close to the parting surface and is connected to the cooling device. When the wall thickness of the die-cast part changes greatly, the cooling device can be controlled to work, and coolant or cooling water can be introduced into the cooling water channel 15 to accelerate the cooling of the metal solution at the position with larger wall thickness, thereby avoiding the internal stress caused by uneven cooling, and further reducing the probability of defects in the die-cast parts.

[0063] like Figure 2As shown, a die-casting extrusion control method provided by an embodiment of the present invention includes:

[0064] S1: Acquire structural data of the cavity and position information of the extrusion pins, wherein a movable mold and a fixed mold of the die-casting mold are fitted together to form the cavity, and a plurality of the extrusion pins are disposed on both the movable mold and the fixed mold.

[0065] Specifically, Figure 1 As shown, the structural data of the cavity (i.e., the size data of the die-casting part) and the position information of the extrusion pin can be obtained, so that the position of the extrusion pin and the wall thickness of the die-casting part at the installation position of the extrusion pin can be known. Figure 1 In the figure, wall thickness refers to the horizontal distance between the inner wall on the left side of the cavity and the inner wall on the right side of the cavity.

[0066] S2: Determine the grade of the extrusion pin according to the structural data of the cavity and the position information of the extrusion pin.

[0067] Specifically, since the wall thickness at the installation position of the extrusion pin is different, the extrusion pin can be graded according to the wall thickness at the location where the extrusion pin is located, such as Figure 1 The extrusion pins in the mold are divided into primary extrusion pins 5, secondary extrusion pins 7 and tertiary extrusion pins 9. Similarly, the extrusion pins on the fixed mold 2 can also be divided into similar grades. Figure 1 In the figure, the wall thickness of the fixed die extrusion pin 12 opposite to the primary extrusion pin 5 at its setting position is the same as the wall thickness corresponding to the primary extrusion pin 5, so the grade of the fixed die extrusion pin 12 is primary; similarly, the grade of the fixed die extrusion pin 12 opposite to the secondary extrusion pin 7 is secondary, and the grade of the fixed die extrusion pin 12 opposite to the tertiary extrusion pin 9 is tertiary.

[0068] S3: When die casting starts, one end of the extrusion pin is controlled to enter the cavity, the exhaust device is controlled to start, and a real-time temperature distribution diagram in the cavity is obtained, wherein the exhaust device is connected to the exhaust hole on the fixed mold.

[0069] Specifically, when the die casting starts, one end of the extrusion pin can be controlled to enter the cavity, that is, the extrusion pin fills the guide hole where it is located, and exceeds the inner wall of the cavity to enter the cavity, so as to avoid residual air in the guide hole of the extrusion pin when the metal solution enters the cavity. At the same time, the vacuum equipment is controlled to start, so that the air in the cavity can be extracted in time, and a negative pressure is first formed in the cavity, which accelerates the speed of the metal solution filling the cavity, reduces the filling time, and reduces the time difference of filling the metal solution at different positions of the cavity. The cooling process of the metal solution at different positions is controlled at the same level, so that the cooling process is balanced, the generation of internal stress is reduced, and shrinkage defects are avoided. In addition, after the die casting starts, the temperature in the cavity needs to be monitored in real time by infrared equipment to obtain a real-time temperature distribution diagram; since the temperature difference between the cavity before and after the metal solution is injected is obvious, the injection of the metal solution and the internal temperature change of the metal solution during the cooling process can be monitored through the real-time temperature distribution diagram.

[0070] S4: According to the real-time temperature distribution diagram and the position information of the extrusion pin, the extrusion pin is controlled to move in a direction away from the cavity.

[0071] Specifically, after the molten metal is injected into the mold cavity, when the liquid level of the molten metal exceeds the position of the extrusion pin, for example, the liquid level of the molten metal exceeds Figure 1 When the lowest extrusion pin is at the position, the lowest extrusion pin can be controlled to move out of the cavity. As the metal liquid level continues to rise, the extrusion pins at various positions are controlled to move out of the cavity one by one. Finally, the positions of the various extrusion pins are as follows: Figure 3 As shown, the extrusion pins retract into their respective guide holes, and the ends of the extrusion pins are at a certain distance from the inner wall of the cavity, and a small amount of metal solution enters the guide holes of the extrusion pins. The retraction of the extrusion pins forms a certain negative pressure in the cavity, and the small amount of air that may remain in the metal solution is more likely to precipitate. The precipitated air can move to the surface of the metal solution, which is convenient for timely discharge from the exhaust hole 3. The precipitated air can also move to the guide holes of the extrusion pins, and does not exist in the final desired die-cast parts. The pores that may be formed are transferred to the excess metal solution in the guide holes. Subsequently, the metal protrusions in multiple places in the guide holes can be directly removed through reprocessing, and the possible pores can be removed at the same time, reducing the probability of pore defects inside the die-cast parts, and further improving the quality and qualified rate of die-cast parts.

[0072] S5: Analyze the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extrusion pin axis according to the real-time temperature distribution diagram, wherein the inner wall of the cavity is offset equidistantly toward the center of the cavity by a specified distance to obtain a segmentation line, such as Figure 3 The dotted line in is the dividing line 16, such as Figure 3As shown, the area between the dividing line 16 and the inner wall of the cavity is the outer layer 18 , and the area surrounded by the dividing line 16 is the inner layer 17 .

[0073] S6: According to the temperature difference and the grade of the extrusion pin, the pressure of the extrusion pin and the temperature of the heating element are controlled, wherein a plurality of the heating elements are arranged in the movable mold and the fixed mold, the heating elements are arranged corresponding to the extrusion pins, the distance between the heating element and the corresponding extrusion pin is less than a first preset distance, and the distance between the heating element and the outer wall of the cavity is less than a second preset distance, so as to ensure that the heating element is close to the extrusion pin and the cavity.

[0074] Specifically, for example, when the temperature difference is too large, that is, the temperature of the outer layer is lower and the temperature of the inner layer is still relatively high, the outer layer gradually solidifies, the strength of the outer layer increases, and it no longer has fluidity and plasticity, but the inner layer 17 is still in liquid or semi-solid state. As the inside gradually cools down, the overall volume shrinks, and the outer layer has solidified and the shape cannot be changed. At this time, the internal stress formed inside will pull the unsolidified liquid in the middle, thereby forming shrinkage holes or shrinkage pores in the last solidified position in the middle of the die-cast part. To avoid this situation, the heating element can be controlled to start heating, delaying the cooling rate of the molten metal in the outer layer and the guide hole guided by the extrusion pin, so that the molten metal in the outer layer and the guide hole is in liquid or semi-solid state, that is, the metal in these two places still has a certain plasticity, and then the extrusion pin is controlled to apply pressure. When the molten metal in the cavity cools and generates internal stress, the outer layer is forced to deform before the inner layer structure under the dual stress of internal stress and external pressure through external pressure. That is, when the die-cast part shrinks during cooling and causes the volume to shrink (the volume of the hot molten metal will be greater than the volume of the metal solid formed after the metal solution is cooled), the excess metal in the guide hole is pressed into the cavity to compensate for the volume difference caused by shrinkage, thereby eliminating internal stress and avoiding shrinkage or shrinkage holes.

[0075] In this optional embodiment, a plurality of extrusion pins are provided on both the movable die and the fixed die of the die-casting mold. The grades of the plurality of extrusion pins are determined based on the obtained structural data of the cavity and the position information of the extrusion pins, so as to facilitate the subsequent separate control of the extrusion pins at different positions of the die-casting parts. When the die-casting starts, one end of the extrusion pin is controlled to enter the cavity, and the vacuum device is controlled to start. The vacuum device is connected to the vacuum hole on the fixed die, and a negative pressure is first formed in the cavity to accelerate the speed at which the metal solution fills the cavity, balance the cooling process of various parts of the cavity, reduce the generation of internal stress, and obtain the real-time temperature distribution diagram in the cavity at the same time, monitor the injection of the metal solution and the internal temperature change of the metal solution during the cooling process; according to the real-time temperature distribution diagram and the position information of the extrusion pin, the extrusion pin is controlled to move away from the cavity, and the retraction of the extrusion pin forms a certain negative pressure in the cavity, and the precipitated air The mold is transferred to the guide hole of the extrusion pin, and the possible pores can be removed by subsequent reprocessing to further improve the quality and pass rate of the die-cast parts; according to the real-time temperature distribution diagram, the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extension line of the extrusion pin axis is analyzed; multiple heating elements are arranged in the movable mold and the fixed mold, and the heating elements are arranged adjacent to the extrusion pins. According to the temperature difference and the grade of the extrusion pin, the pressure of the extrusion pin and the temperature of the heating element are controlled. The heating is started by controlling the heating element to keep the metal in the outer layer and the guide hole plastic. By controlling the extrusion pin to apply external pressure, the outer layer is forced to deform before the inner layer structure under the dual stress of internal stress and external pressure, and the excess metal in the guide hole is pressed into the cavity to compensate for the volume difference caused by cold shrinkage, thereby eliminating internal stress, avoiding shrinkage or shrinkage holes, and improving the quality of die-cast parts.

[0076] Optionally, determining the grade of the extrusion pin according to the structural data of the cavity and the position information of the extrusion pin comprises:

[0077] Based on the position information of the extrusion pin, the axis of the extrusion pin is extended to obtain an axis extension line.

[0078] Based on the structural data of the cavity, the two intersection points of the axis extension line and the inner wall of the cavity are determined, and the distance between the two intersection points is measured to obtain the thickness of the die-cast part at the position of each extrusion pin.

[0079] The grade of the extrusion pin is determined according to the thickness of the die-cast part corresponding to each extrusion pin and the preset thickness range, wherein the multiple grades of the extrusion pin correspond one-to-one to the multiple preset thickness ranges.

[0080] In this embodiment, for example, the preset thickness range corresponding to the first level of the extrusion pin is 0-10mm, the preset thickness range corresponding to the second level is 10-25mm, and the preset thickness range corresponding to the third level is 25-40mm, etc. If the thickness of the die-cast part where the extrusion pin is located is 7mm, then the extrusion pin is a first-level extrusion pin. Grading the extrusion pins facilitates adaptive control of the extrusion pins. Extrusion pins of different levels need to retreat from the cavity to the guide hole at different distances. The smaller the grade of the extrusion pin, the more it retracts to the guide hole to stop vomiting. The smaller the distance between the end of the extrusion pin and the inner wall of the cavity, the smaller the pressure applied by the extrusion pin to the die-cast part in the later stage. After such graded control, it is beneficial to reduce the design size of the extrusion pin and reduce the cost of the force-applying drive component.

[0081] Optionally, controlling the extrusion pin to move in a direction away from the cavity according to the real-time temperature distribution map and the position information of the extrusion pin comprises:

[0082] According to the real-time temperature distribution diagram, the liquid level position information of the molten metal in the cavity is obtained.

[0083] It is determined whether the liquid level of the molten metal is higher than the position of the extrusion pin according to the liquid level position information and the position information of the extrusion pin.

[0084] When the liquid level of the molten metal is higher than the position of the extrusion pin, the extrusion pin is controlled to move in a direction away from the cavity.

[0085] In this embodiment, when no molten metal is injected into the cavity, its temperature is not high. It is assumed that the temperature in the cavity is slightly higher than the ambient temperature at this time, at the level of thirty to forty degrees Celsius. However, after the molten metal is injected into the cavity, its temperature can instantly rise to several hundred degrees Celsius. There is an obvious difference, and the temperature of the cavity with molten metal is significantly higher than the temperature of the cavity without molten metal. Therefore, based on this obvious difference, the liquid level of the molten metal can be monitored in real time. When the liquid level exceeds the extrusion pin, the extrusion pin can be controlled to retract into the guide hole, so that the cavity is completely filled with the molten metal. In addition, the retraction of the extrusion pin can further aggravate the negative pressure in the cavity, which is beneficial to the precipitation of air in the metal solution and reduces surface pore defects.

[0086] Optionally, when the liquid level of the molten metal is higher than the position of the extrusion pin, controlling the extrusion pin to move in a direction away from the cavity comprises:

[0087] When the liquid level of the molten metal is higher than the position of the extrusion pin, for the extrusion pin located below the liquid level of the molten metal, the retraction distance corresponding to the grade of the extrusion pin is called, and the extrusion pin is controlled to move out of the cavity until the distance between one end of the extrusion pin close to the cavity and the inner wall of the cavity reaches the retraction distance, wherein different grades of the extrusion pin correspond to different retraction distances.

[0088] In this embodiment, the movement of the extrusion pin is controlled according to the grade of the extrusion pin, and finally the distance between the extrusion pin and the inner wall of the cavity is adjusted to the retraction distance. Different retraction distances are set for extrusion pins of different grades. Because the cold shrinkage and internal stress generated in places with smaller wall thickness of the part are smaller, more volume compensation is not required, and therefore a larger retraction distance does not need to be set, which reduces the waste of molten metal, avoids more reprocessing in the later stage, reduces reprocessing time, and improves efficiency.

[0089] Optionally, analyzing the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extrusion pin axis according to the real-time temperature distribution diagram includes:

[0090] Based on the real-time temperature distribution diagram, a plurality of outer layer temperatures and a plurality of inner layer temperatures on an extended axis line of each of the extrusion pins are extracted.

[0091] Specifically, for example, the extended line of the axis of the extrusion pin has two intersections with the inner wall of the cavity, and multiple temperature extraction points are set between the two intersections. These temperature extraction points can be arranged equidistantly or unequally spaced in the outer and inner layers. By extracting the temperatures at multiple temperature extraction points, multiple outer layer temperatures and multiple inner layer temperatures can be obtained.

[0092] According to the multiple outer layer temperatures corresponding to the extrusion pin, the outer layer average temperature and the outer layer minimum temperature corresponding to the extrusion pin are obtained.

[0093] Specifically, multiple outer layer temperatures are added and divided by the number of outer layer temperatures to obtain the outer layer average temperature; multiple outer layer temperatures are compared, and the smallest temperature is recorded as the outer layer minimum temperature. The outer layer average temperature can be used to measure the overall temperature of the outer layer, and the outer layer minimum temperature can be used to monitor the cooling of the outer metal solution.

[0094] According to the multiple inner layer temperatures corresponding to the extrusion pin, the inner layer maximum temperature corresponding to the extrusion pin is obtained. The multiple inner layer temperatures are compared, and the maximum temperature is recorded as the inner layer maximum temperature, which can reflect the cooling condition and cooling degree of the inner layer.

[0095] Determine whether the outer layer minimum temperature corresponding to the extrusion pin is less than a preset outer layer temperature.

[0096] When the lowest temperature of the outer layer corresponding to the extrusion pin is greater than or equal to the preset outer layer temperature, it means that the outer layer has not been completely solidified, but is still in a semi-solidified state, has a certain plasticity, and can be deformed by extrusion. The temperature difference corresponding to the extrusion pin is obtained by subtracting the average temperature of the outer layer from the highest temperature of the inner layer.

[0097] In this embodiment, when the outer layer is not completely solidified as monitored by the lowest temperature of the outer layer, the average temperature of the outer layer reflects the overall cooling level of the outer layer, while the highest temperature of the inner layer reflects the highest temperature level of the inner layer. The temperature difference obtained by subtracting the average temperature of the outer layer from the highest temperature of the inner layer can indirectly reflect the size of the stress that may be generated between the highest temperature area of ​​the inner layer and the outer layer area. The greater the temperature difference, the greater the internal stress that may exist between the two, thereby monitoring the internal stress between the inner and outer layers.

[0098] Optionally, after determining whether the outer layer minimum temperature corresponding to the extrusion pin is less than a preset outer layer temperature, the die-casting extrusion control method further includes:

[0099] When the lowest temperature of the outer layer corresponding to the extrusion pin is lower than the preset outer layer temperature, it indicates that the outer layer may enter a stage of complete solidification. If the temperature of the outer layer further decreases, the outer layer may completely solidify and the plasticity of the outer layer decreases. At this time, at least one of the heating elements corresponding to the extrusion pin can be controlled to be energized to delay the cooling of the outer layer and avoid complete solidification of the outer layer. The heating timing can also be performed to obtain the heating time.

[0100] When the heating time is greater than the preset time and the lowest temperature of the outer layer corresponding to the extrusion pin is still lower than the preset outer layer temperature, the power-on voltage of the heating element is increased or the number of the heating elements corresponding to the extrusion pin that are powered on is increased to increase the overall heat dissipation of the heating element, improve the insulation and heating of the outer layer and the metal in the guide hole, and slow down the cooling rate of the metal in the outer layer and the guide hole.

[0101] When the lowest temperature of the outer layer corresponding to the extrusion pin is greater than or equal to the preset outer layer temperature, it means that the temperature difference between the inner and outer layers is small, the cooling process of the inner and outer layers is similar, the internal stress between the inner and outer layers is small, and shrinkage or shrinkage holes are not easy to occur inside. At this time, the heating element corresponding to the extrusion pin can be controlled to stop working.

[0102] Optionally, controlling the pressure of the extrusion pin and the temperature of the heating element according to the temperature difference and the grade of the extrusion pin comprises:

[0103] Determine whether the temperature difference is greater than a preset temperature difference.

[0104] When the temperature difference is greater than the preset temperature difference, according to the grade of the extrusion pin, the pressure of the extrusion pin is adjusted to the preset pressure corresponding to the grade of the extrusion pin, wherein each grade of the extrusion pin corresponds to one preset pressure. When the temperature difference is less than or equal to the preset temperature difference, the extrusion pin is not adjusted and controlled.

[0105] In this embodiment, when the temperature difference is greater than the preset temperature difference, it means that the cooling process between the inner layer and the outer layer is quite different. The faster cooling of the outer layer will cause a larger internal stress between the inner and outer layers, which is easy to form shrinkage holes or shrinkage defects. However, at this time, the inner layer may still have metal solution or the plasticity of the inner metal is stronger than that of the outer metal. Under the action of internal stress, the inner layer is more easily deformed. At this time, the extrusion pin is controlled to apply external force to the die-cast part. At the position with a large temperature difference, the pressure is adjusted according to the grade of the extrusion pin. The higher the grade of the extrusion pin, the greater the corresponding preset pressure, so that the metal at this position of the die-cast part is more likely to deform. With the assistance of external force, the outer layer is deformed before the inner layer, avoiding shrinkage or shrinkage holes in the inner layer.

[0106] Optionally, after determining whether the temperature difference is greater than a preset temperature difference, the die-casting extrusion control method further includes:

[0107] When the temperature difference is greater than the preset temperature difference, the temperature difference is subtracted from the preset temperature difference to obtain the compensation temperature, and the heating element corresponding to the extrusion pin is controlled to be powered on, wherein the heating temperature of the heating element is half of the compensation temperature plus the average temperature of the outer layer.

[0108] In this embodiment, when the temperature difference is greater than the preset temperature difference, it means that the cooling process between the inner layer and the outer layer is quite different. The faster cooling of the outer layer will cause greater internal stress between the inner and outer layers, which is easy to form shrinkage holes or shrinkage defects. It is necessary to reduce the difference in cooling process between the inner layers and control the heating temperature near the extrusion pin to reach half of the compensation temperature plus the average temperature of the outer layer. On the one hand, the outer layer can be insulated and heated, and on the other hand, the inner layer can be allowed to dissipate heat. In this way, the outer layer is kept warm and the inner layer continues to dissipate heat, thereby reducing the temperature difference between the inner and outer layers, so that the temperature difference drops to less than the preset temperature difference, reducing the stress between the inner and outer layers, and reducing the probability of defects in the inner layer.

[0109] Optionally, after determining whether the temperature difference is greater than a preset temperature difference, the die-casting extrusion control method further includes:

[0110] When the temperature difference corresponding to any one of the extrusion pins is greater than the preset temperature difference, the cooling device is controlled to operate, wherein the cooling device is connected to a cooling water channel, and the cooling water channel is provided at one end of the movable mold close to the parting surface or / and at one end of the fixed mold close to the parting surface.

[0111] In this embodiment, if Figure 4 As shown, the cooling water channel 15 is close to the parting surface and arranged around the cavity in the vertical direction. The extrusion pins and the heating element are arranged in the horizontal direction. When the cooling water is passed into the cooling water channel 15, the metal solution in the cavity can be accelerated to cool in the vertical direction. Figure 4 For example, the cooling water channel 15 exchanges heat with the outer layer 18 at the upper and lower ends of the cavity, and then exchanges heat with the inner layer 17. From a horizontal perspective, the position of the cooling water channel 15 is biased towards the middle and lower layers. Figure 4 The dashed arrows in the figure schematically show the cold transfer in the cooling water channel 15 (but in fact, the heat exchange should be the heat transfer outward). Figure 4 The molten metal on the right side of the medium cavity will complete cooling first, and then the left side of the cavity will gradually cool and solidify. Therefore, if shrinkage or shrinkage cavity occurs, it will only appear on the left side of the cavity, transferring the defect to a position closer to the surface of the die-cast part. The internal stress is also transferred to the left side of the cavity, close to the surface of the die-cast part. After the extrusion pin applies external force, it is easier to eliminate the defects on the surface of the die-cast part, further improving the quality of the die-cast part.

[0112] like Figure 5 As shown, a die-casting extrusion control system provided by an embodiment of the present invention includes:

[0113] The initial data acquisition module 100 is used to acquire the structural data of the cavity and the position information of the extrusion pins, wherein the movable mold and the fixed mold of the die-casting mold are fitted together to form the cavity, and a plurality of the extrusion pins are arranged on the movable mold and the fixed mold.

[0114] The grade confirmation module 200 is used to determine the grade of the extrusion pin according to the structural data of the cavity and the position information of the extrusion pin.

[0115] The control module 300 is used to control one end of the extrusion pin to enter the cavity and control the start of the air extraction device when the die casting starts, wherein the air extraction device is connected to the air extraction hole on the fixed mold.

[0116] The real-time data acquisition module 400 is used to acquire the real-time temperature distribution diagram in the cavity.

[0117] The control module 300 is further used to control the extrusion pin to move in a direction away from the cavity according to the real-time temperature distribution diagram and the position information of the extrusion pin.

[0118] The temperature analysis module 500 is used to analyze the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extrusion pin axis according to the real-time temperature distribution diagram, wherein the inner wall of the cavity is equidistantly offset toward the center of the cavity by a specified distance to obtain a dividing line, the area between the dividing line and the inner wall of the cavity is the outer layer, and the area surrounded by the dividing line is the inner layer.

[0119] The control module 300 is also used to control the pressure of the extrusion pin and the temperature of the heating element according to the temperature difference and the grade of the extrusion pin, wherein a plurality of the heating elements are arranged in the movable mold and the fixed mold, the heating elements are arranged corresponding to the extrusion pins, the distance between the heating element and the corresponding extrusion pin is less than a first preset distance, and the distance between the heating element and the outer wall of the cavity is less than a second preset distance.

[0120] In this optional embodiment, the initial data acquisition module 100 acquires the structural data of the cavity and the position information of the extrusion pins, wherein a plurality of extrusion pins are provided on both the movable mold and the fixed mold of the die-casting mold, and the grade confirmation module 200 determines the grades of the plurality of extrusion pins according to the acquired structural data of the cavity and the position information of the extrusion pins, so as to facilitate the subsequent separate control of the extrusion pins at different positions of the die-casting parts; when the die-casting starts, the control module 300 controls one end of the extrusion pin to enter the cavity, controls the start of the exhaust device, and connects the exhaust device to the exhaust hole on the fixed mold, so as to first form a negative pressure in the cavity, accelerate the speed at which the metal solution fills the cavity, balance the cooling process at various locations in the cavity, and reduce the generation of internal stress; at the same time, the real-time data acquisition module 400 acquires the real-time temperature distribution diagram in the cavity, monitors the injection of the metal solution and the internal temperature change of the metal solution during the cooling process; the control module 300 controls the extrusion pin to move away from the cavity according to the real-time temperature distribution diagram and the position information of the extrusion pin. The retraction of the extrusion pin forms a certain negative pressure in the cavity, and the precipitated air is transferred to the guide hole of the extrusion pin. The possible pores can be removed by subsequent reprocessing, thereby further improving the quality and qualified rate of the die-cast parts; the temperature analysis module 500 analyzes the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extension line of the extrusion pin axis according to the real-time temperature distribution diagram; multiple heating elements are arranged in the movable mold and the fixed mold, and the heating elements are arranged adjacent to the extrusion pins. The control module 300 controls the pressure of the extrusion pin and the temperature of the heating element according to the temperature difference and the grade of the extrusion pin, and starts heating by controlling the heating element to keep the metal in the outer layer and the guide hole plastic. By controlling the extrusion pin to apply external pressure, the outer layer is forced to deform before the inner layer structure under the dual stress of internal stress and external pressure, and the excess metal in the guide hole is pressed into the cavity to compensate for the volume difference caused by cold shrinkage, thereby eliminating internal stress, avoiding shrinkage or shrinkage holes, and improving the quality of die-cast parts.

[0121] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A die casting extrusion control method, characterized in that: include: Acquire structural data of the cavity and position information of the extrusion pins, wherein the movable die and the fixed die of the die-casting mold are fitted together to form the cavity, and a plurality of the extrusion pins are disposed on the movable die and the fixed die; Determining the grade of the extrusion pin according to the structural data of the cavity and the position information of the extrusion pin; When die casting starts, one end of the extrusion pin is controlled to enter the cavity, the air extraction device is controlled to start, and a real-time temperature distribution diagram in the cavity is obtained, wherein the air extraction device is connected to the air extraction hole on the fixed mold; According to the real-time temperature distribution diagram and the position information of the extrusion pin, controlling the extrusion pin to move in a direction away from the cavity; According to the real-time temperature distribution diagram, the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extrusion pin axis is analyzed, wherein the inner wall of the cavity is equidistantly offset toward the center of the cavity by a specified distance to obtain a dividing line, the area between the dividing line and the inner wall of the cavity is the outer layer, and the area surrounded by the dividing line is the inner layer; According to the temperature difference and the grade of the extrusion pin, the pressure of the extrusion pin and the temperature of the heating element are controlled, wherein a plurality of the heating elements are arranged in the movable mold and the fixed mold, and the heating elements are arranged corresponding to the extrusion pins; Determining the grade of the extrusion pin according to the structural data of the cavity and the position information of the extrusion pin comprises: Based on the position information of the extrusion pin, the axis of the extrusion pin is extended to obtain an axis extension line; Based on the structural data of the cavity, two intersection points of the axis extension line and the inner wall of the cavity are determined, and the distance between the two intersection points is measured to obtain the thickness of the die-cast part at the position of each extrusion pin; Determine the grade of the extrusion pin according to the thickness of the die-cast part corresponding to each extrusion pin and the preset thickness range, wherein the multiple grades of the extrusion pin correspond one-to-one to the multiple preset thickness ranges; According to the real-time temperature distribution diagram and the position information of the extrusion pin, controlling the extrusion pin to move in a direction away from the cavity comprises: According to the real-time temperature distribution diagram, liquid level position information of the molten metal in the cavity is obtained; Determining whether the liquid level of the molten metal is higher than the position of the extrusion pin according to the liquid level position information and the position information of the extrusion pin; When the liquid level of the molten metal is higher than the position of the extrusion pin, the extrusion pin is controlled to move in a direction away from the cavity.

2. The die casting extrusion control method according to claim 1, characterized in that: When the liquid level of the molten metal is higher than the position of the extrusion pin, controlling the extrusion pin to move in a direction away from the cavity comprises: When the liquid level of the molten metal is higher than the position of the extrusion pin, for the extrusion pin located below the liquid level of the molten metal, the retraction distance corresponding to the grade of the extrusion pin is called, and the extrusion pin is controlled to move out of the cavity until the distance between one end of the extrusion pin close to the cavity and the inner wall of the cavity reaches the retraction distance, wherein different grades of the extrusion pin correspond to different retraction distances.

3. The die casting extrusion control method according to claim 1, characterized in that: The analyzing, according to the real-time temperature distribution diagram, the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extrusion pin axis includes: Based on the real-time temperature distribution diagram, extracting a plurality of outer layer temperatures and a plurality of inner layer temperatures on an extended axis line of each extrusion pin; According to the multiple outer layer temperatures corresponding to the extrusion pin, an outer layer average temperature and an outer layer minimum temperature corresponding to the extrusion pin are obtained; According to the multiple inner layer temperatures corresponding to the extrusion pin, the highest inner layer temperature corresponding to the extrusion pin is obtained; Determine whether the outer layer minimum temperature corresponding to the extrusion pin is less than a preset outer layer temperature; When the outer layer minimum temperature corresponding to the extrusion pin is greater than or equal to the preset outer layer temperature, the temperature difference corresponding to the extrusion pin is obtained by subtracting the outer layer average temperature from the inner layer maximum temperature.

4. The die casting extrusion control method according to claim 3, characterized in that: After determining whether the outer layer minimum temperature corresponding to the extrusion pin is less than the preset outer layer temperature, the method further includes: When the lowest temperature of the outer layer corresponding to the extrusion pin is lower than the preset outer layer temperature, at least one of the heating elements corresponding to the extrusion pin is controlled to be powered on, and heating timing is performed to obtain a heating time; When the heating time is longer than the preset time, and the outer layer minimum temperature corresponding to the extrusion pin is still lower than the preset outer layer temperature, the power-on voltage of the heating element is increased or the number of the heating elements corresponding to the extrusion pin that are powered on is increased; When the lowest temperature of the outer layer corresponding to the extrusion pin is greater than or equal to the preset outer layer temperature, the heating element corresponding to the extrusion pin is controlled to stop working.

5. The die casting extrusion control method according to claim 3, characterized in that: The step of controlling the pressure of the extrusion pin and the temperature of the heating element according to the temperature difference and the grade of the extrusion pin comprises: Determining whether the temperature difference is greater than a preset temperature difference; When the temperature difference is greater than the preset temperature difference, the pressure of the extrusion pin is adjusted to a preset pressure corresponding to the grade of the extrusion pin according to the grade of the extrusion pin, wherein each grade of the extrusion pin corresponds to one preset pressure.

6. The die casting extrusion control method according to claim 5, characterized in that: After determining whether the temperature difference is greater than the preset temperature difference, the method further includes: When the temperature difference is greater than the preset temperature difference, the temperature difference is subtracted from the preset temperature difference to obtain the compensation temperature, and the heating element corresponding to the extrusion pin is controlled to be powered on, wherein the heating temperature of the heating element is half of the compensation temperature plus the average temperature of the outer layer.

7. The die casting extrusion control method according to claim 5, characterized in that: After determining whether the temperature difference is greater than the preset temperature difference, the method further includes: When the temperature difference corresponding to any one of the extrusion pins is greater than the preset temperature difference, the cooling device is controlled to operate, wherein the cooling device is connected to a cooling water channel, and the cooling water channel is provided at one end of the movable mold close to the parting surface or / and at one end of the fixed mold close to the parting surface.

8. A die casting extrusion control system, characterized in that: include: An initial data acquisition module, used to acquire structural data of the cavity and position information of the extrusion pins, wherein the movable mold and the fixed mold of the die-casting mold are fitted together to form the cavity, and a plurality of the extrusion pins are arranged on the movable mold and the fixed mold; A grade confirmation module, used to determine the grade of the extrusion pin according to the structural data of the cavity and the position information of the extrusion pin; A control module, used for controlling one end of the extrusion pin to enter the cavity and controlling the start of the air extraction device when the die casting starts, wherein the air extraction device is connected to the air extraction hole on the fixed mold; A real-time data acquisition module, used to acquire a real-time temperature distribution diagram in the cavity; The control module is further used to control the extrusion pin to move in a direction away from the cavity according to the real-time temperature distribution diagram and the position information of the extrusion pin; A temperature analysis module, for analyzing the temperature difference between the outer layer temperature and the inner layer temperature in the cavity in the direction of the extrusion pin axis according to the real-time temperature distribution diagram, wherein the inner wall of the cavity is equidistantly offset toward the center of the cavity by a specified distance to obtain a dividing line, the area between the dividing line and the inner wall of the cavity is the outer layer, and the area surrounded by the dividing line is the inner layer; The control module is further used to control the pressure of the extrusion pin and the temperature of the heating element according to the temperature difference and the grade of the extrusion pin, wherein a plurality of the heating elements are arranged in the movable mold and the fixed mold, and the heating elements are arranged corresponding to the extrusion pins; Wherein, determining the grade of the extrusion pin according to the structural data of the cavity and the position information of the extrusion pin comprises: Based on the position information of the extrusion pin, the axis of the extrusion pin is extended to obtain an axis extension line; Based on the structural data of the cavity, two intersection points of the axis extension line and the inner wall of the cavity are determined, and the distance between the two intersection points is measured to obtain the thickness of the die-cast part at the position of each extrusion pin; Determine the grade of the extrusion pin according to the thickness of the die-cast part corresponding to each extrusion pin and the preset thickness range, wherein the multiple grades of the extrusion pin correspond one-to-one to the multiple preset thickness ranges; Wherein, controlling the extrusion pin to move in a direction away from the cavity according to the real-time temperature distribution diagram and the position information of the extrusion pin comprises: According to the real-time temperature distribution diagram, liquid level position information of the molten metal in the cavity is obtained; Determining whether the liquid level of the molten metal is higher than the position of the extrusion pin according to the liquid level position information and the position information of the extrusion pin; When the liquid level of the molten metal is higher than the position of the extrusion pin, the extrusion pin is controlled to move in a direction away from the cavity.

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