Aluminum alloy die casting die

Abstract

The utility model relates to the technical field of die casting dies, and discloses an aluminum alloy die casting die which is characterized in that an upper die base and a lower die base are accurately closed through a positioning insertion rod and a positioning insertion hole, the liquid inlet end of the upper die base is communicated with an aluminum liquid conveying pipe, and a material ejecting assembly is arranged at the bottom of the lower die base; the ejector pin corresponds to the ejector pin hole in position and is driven by an electric push rod to vertically eject out, a physical isolation structure composed of a partition groove and a partition plate is arranged at the bottom of a cavity of the lower die base, an ejector pin installation area is completely isolated from a molten aluminum flowing path, and a die parting surface achieves secondary sealing through an external connection baffle and an elastic protruding head. According to the mold, molten aluminum liquid is prevented from invading ejector pin mounting positions through independent ejector pin hole design, the molten aluminum is prevented from permeating ejector pin hole areas through cooperation of a partition groove and an isolation structure of a partition plate, ejector pins make contact with the non-appearance face of a blank only in the demolding stage, a circulating cooling system is formed by a cooling channel extending port and a hollow cylinder, and a mold temperature field is evenly distributed; and the die-casting forming quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of die casting mold technology, specifically to an aluminum alloy die casting mold. Background Technology

[0002] Aluminum alloys have a density only one-third that of steel, but a higher specific strength (strength to density ratio). They also exhibit excellent impact toughness, especially at both high and low temperatures. Aluminum alloy die castings combine high strength and wear resistance, and are widely used in key components such as automotive engine brackets and gearbox housings. Aluminum alloys have a thermal conductivity three times that of steel, allowing them to dissipate heat quickly, making them suitable for applications with high heat dissipation requirements, such as LED lamp covers and motor housings. The core principle of aluminum alloy die casting is high-pressure forced filling and rapid solidification. Molten aluminum alloy is injected into the mold cavity under high pressure in the die casting machine. After the molten aluminum alloy cools and solidifies in the mold cavity, the aluminum alloy die casting can be removed for processing.

[0003] Traditional aluminum alloy die-casting molds typically employ a design where the ejector pin holes are directly connected to the mold cavity. During the filling process, molten aluminum alloy easily seeps into the mold through the ejector pin mounting channels. When the molten metal cools and solidifies, the ejector pin tip mechanically engages with the lower surface of the workpiece, requiring a large ejection force during demolding. This not only increases the risk of workpiece deformation but also easily leaves ejector pin marks or scratches on the workpiece surface. During repeated ejection operations, residual metal debris exacerbates frictional wear between the ejector pin and the mold cavity wall, causing ejector pin jamming, displacement, or even breakage, requiring frequent downtime for maintenance. Furthermore, the unisolated ejector pin structure exposes the bottom of the mold cavity to prolonged exposure to high-temperature molten aluminum, accelerating thermal fatigue of the mold material and shortening its overall service life. Therefore, a new aluminum alloy die-casting mold is proposed. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides an aluminum alloy die-casting mold to solve the aforementioned technical problems of increasing the risk of blank deformation and shortening the overall service life.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: an aluminum alloy die-casting mold, comprising:

[0008] The upper mold base and the lower mold base are disposed on the lower surface of the upper mold base. The upper surface of the upper mold base is connected to the liquid inlet pipe, and the lower surface of the lower mold base is uniformly provided with ejector pin holes. An ejector assembly is provided below the lower mold base, and the inner cavities of the upper mold base and the lower mold base are respectively provided with an upper cooling channel and a lower cooling channel.

[0009] A dividing groove is provided on the front side of the lower mold base, and a dividing plate is inserted and connected to the inner cavity of the dividing groove. The dividing plate is located at the bottom of the cavity of the lower mold base.

[0010] An external baffle is rotatably connected to the front and back of the lower mold base. The back of the external baffle is fitted with an elastic protrusion, and a connecting recess is formed above the elastic protrusion. The upper and lower mold bases are closed by a guide mechanism to form a closed aluminum alloy die-casting cavity. A partition plate is pre-inserted into the dividing groove at the bottom of the lower mold base cavity to completely isolate the area where the ejector pin holes are located from the flow path of the molten metal in the cavity. The external baffle on the front and back of the lower mold base is rotated so that its back is tightly fitted against the front and back of the partition plate. Simultaneously, the external baffle is tightly fitted against the dividing groove to prevent aluminum melt from overflowing during die casting. Molten aluminum alloy is injected into the cavity through the inlet pipe on the upper surface of the upper mold base. The molten aluminum smoothly fills the cavity processing area defined by the partition plate along the preset flow channel. The upper and lower cooling channels start synchronously, circulating... The cooling medium precisely controls the temperature field distribution of the mold, preventing premature solidification of the molten aluminum or local overheating. After the molten aluminum cools and solidifies in the cavity, the upper mold base separates from the lower mold base. The partition plate remains in place and continues to physically isolate the ejector pin hole area to prevent incompletely solidified molten aluminum from seeping in. The external connecting baffle is rotated to the connecting recess for locking connection. The partition plate in the dividing groove is removed, and the ejector assembly rises vertically along the ejector pin hole, allowing the blank to smoothly detach from the lower mold base under uniform ejection force, with no adhesion or scratches on the surface. The upper and lower cooling channels are flushed in reverse to remove internal deposits, completing the mold maintenance cycle.

[0011] Preferably, the inlet and outlet ends of the upper and lower cooling channels both extend outward through the inner walls of the upper and lower mold bases. The inlet and outlet ends of the upper and lower cooling channels respectively extend outward through the inner walls of the upper and lower mold bases, forming independent cooling circuits. External cooling equipment injects circulating medium into the cooling channels through the extended ports. The medium flows along a preset path and absorbs heat from the mold, finally returning to the equipment from the outlet end to complete heat exchange.

[0012] Preferably, the inlet end of the upper cooling channel corresponds to the outlet end of the lower mold base, and a hollow cylinder is installed at the inlet end of each upper cooling channel. With the inlet end of the upper cooling channel corresponding to the outlet end of the lower mold base, the cooling medium, after being injected from the inlet end of the upper mold base, flows through the hollow cylinder into the cooling channel of the lower mold base, forming a dynamic balance in the temperature field of the mold base and preventing leakage. The corresponding design of the inlet end of the upper cooling channel and the outlet end of the lower mold base, combined with the guiding effect of the hollow cylinder, allows the cooling medium to form a continuous flow path, eliminating the local overheating phenomenon that may occur in traditional parallel cooling channels and improving the thermal balance of the mold.

[0013] Preferably, positioning rods are installed around the bottom of the upper mold base, and positioning holes are provided around the top of the lower mold base. The positioning rods around the bottom of the upper mold base are aligned with the positioning holes around the top of the lower mold base and inserted into it. The mechanical limiting eliminates the mold closing gap, ensuring that the cavity is completely sealed after the upper and lower mold bases are closed.

[0014] Preferably, the inner wall of the dividing groove has limiting grooves on both sides, and limiting rails are slidably connected to the inner cavities of the limiting grooves, with the limiting rails connected to the partition plate. The sliding engagement between the limiting grooves in the dividing groove and the limiting rails on the partition plate allows the limiting rails on both sides of the partition plate to slide along the limiting grooves on the inner wall of the dividing groove until the partition plate is completely embedded in the inner cavity of the dividing groove. This groove-rail engagement achieves both axial and radial limiting of the partition plate.

[0015] Preferably, the ejector assembly includes a lifting seat, with ejector pins mounted on the top of the lifting seat, the ejector pins corresponding to ejector pin holes, and electric push rods mounted on both sides of the lifting seat. The electric push rods drive the lifting seat to rise vertically, causing the ejector pins to move along the axis of the ejector pin holes. After the ejector pin ends contact the lower surface of the blank, the blank is ejected from the lower mold cavity by a continuously applied ejection force. Simultaneously, the four sets of electric push rods are connected to an external power source and operate synchronously in a lifting and lowering manner under the control of the controller and control system.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides an aluminum alloy die-casting mold, which has the following characteristics:

[0018] Beneficial effects:

[0019] This aluminum alloy die-casting mold features an independent ejector pin hole and ejector assembly at the bottom of the lower mold base. This ensures that the ejector pins only contact the bottom of the formed blank during the demolding stage, effectively avoiding the problem of molten aluminum alloy intrusion caused by direct communication between the ejector pin hole and the cavity in traditional designs. The bottom of the lower mold base cavity forms a physical isolation structure through a dividing groove and a partition plate, completely isolating the ejector pin hole area from the molten flow path of the cavity. This ensures that the molten aluminum alloy only fills the machined surface of the cavity and does not seep into the ejector pin installation position. After die casting is completed, the ejector pins are vertically ejected along the dedicated ejector pin hole under the drive of the lifting structure, with their ends only contacting the lower surface of the blank (non-visual surface). The regional contact design avoids adhesion caused by molten metal enveloping the ejector pin ends, and also prevents surface scratches caused by repeated contact between the ejector pins and the cavity wall in traditional designs. This design ensures that the blank is subjected to uniform force during ejection, significantly reducing demolding resistance. Operators can easily separate the blank from the mold, while eliminating surface protrusions or scratches caused by ejector pin adhesion, ensuring the integrity of the blank's appearance and dimensional accuracy. In addition, the isolated ejector pin structure extends the service life of the ejector pins, reduces ejector pin jamming or wear caused by molten metal erosion, and further improves the stability of mold operation and ease of maintenance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the separated structure of the upper mold base, lower mold base, and ejector assembly of this utility model;

[0022] Figure 3 This is a partial cross-sectional view of the upper mold of this utility model;

[0023] Figure 4 This is a schematic diagram of the separation structure of the lower mold base and the partition plate of this utility model;

[0024] Figure 5 This is a schematic diagram of the partition plate and its connection structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the top material assembly and its connection structure of the present invention.

[0026] In the diagram: 1. Upper mold base; 2. Lower mold base; 3. Ejector pin hole; 4. Ejector assembly; 5. Liquid inlet pipe; 6. Upper cooling channel; 7. Hollow cylinder; 8. Positioning rod; 9. Positioning hole; 10. Lower cooling channel; 11. Dividing groove; 12. Divider plate; 13. Limiting groove; 14. Limiting rail; 15. External connecting baffle; 16. Elastic protrusion; 17. Connecting recess; 18. Lifting seat; 19. Ejector pin; 20. Electric push rod. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] This utility model provides a technical solution: an aluminum alloy die-casting mold, comprising: (see details) Figures 1 to 5 The upper mold base 1 and the lower mold base 2 are disposed on the lower surface of the upper mold base 1. The upper surface of the upper mold base 1 is connected to the liquid inlet pipe 5. The lower surface of the lower mold base 2 is uniformly provided with ejector pin holes 3. An ejector assembly 4 is provided below the lower mold base 2. The upper cooling channel 6 and the lower cooling channel 10 are respectively provided in the inner cavity of the upper mold base 1 and the lower mold base 2.

[0029] The dividing groove 11 has a front side of the lower mold base 2, and a dividing plate 12 is inserted and connected to the inner cavity of the dividing groove 11. The dividing plate 12 is located at the bottom of the cavity of the lower mold base 2.

[0030] The outer connecting baffle 15 is rotatably connected to the front and back of the lower mold base 2, and an elastic protrusion 16 is installed on the back of the outer connecting baffle 15, and a connecting recess 17 is provided above the elastic protrusion 16. The upper mold base 1 and the lower mold base 2 are closed by a guide mechanism to form a closed aluminum alloy die-casting cavity. A partition plate 12 is pre-inserted in the dividing groove 11 at the bottom of the cavity of the lower mold base 2 to completely isolate the area where the ejector pin hole 3 is located from the flow path of the molten metal in the cavity. The external connecting baffle 15 on the front and back of the lower mold base 2 is rotated so that its back is in close contact with the front and back of the partition plate 12. At the same time, the external connecting baffle 15 is in close contact with the dividing groove 11 to prevent the aluminum liquid from overflowing during the die-casting process. The molten aluminum alloy liquid is injected into the cavity through the liquid inlet pipe 5 on the upper surface of the upper mold base 1. The aluminum liquid smoothly fills the cavity processing area defined by the partition plate 12 along the preset flow channel. The upper cooling channel 6 and the lower cooling channel 10 are started simultaneously. The temperature field distribution of the mold is precisely controlled by circulating cooling medium to avoid premature solidification of the aluminum liquid or local overheating. After the aluminum liquid cools and solidifies in the cavity, the upper mold base 1 and the lower mold base 2 are separated. The partition plate 12 remains in place and continues to process the area of ​​the ejector pin hole 3. Physical isolation prevents incompletely solidified molten aluminum from seeping in. The external connecting baffle 15 is rotated to the connecting recess 17 for locking connection. The partition plate 12 in the dividing groove 11 is removed, and the ejector assembly 4 rises vertically along the ejector pin hole 3, allowing the blank to smoothly detach from the lower mold base 2 under uniform ejection force, with no adhesion or scratches on the surface. The upper cooling channel 6 and the lower cooling channel 10 remove internal deposits through reverse flushing, completing the mold maintenance cycle. The isolation structure formed by the dividing groove 11 and the partition plate 12 completely isolates the area of ​​the ejector pin hole 3 from the melt flow path of the cavity, preventing molten aluminum from seeping into the ejector pin hole 3 and contacting the ejector assembly 4, ensuring that the ejector assembly 4 operates without jamming risk for a long time, and extending its service life. The combined design of the external connecting baffle 15, the elastic protrusion 16, and the connecting recess 17 enables rapid opening and closing of the mold cavity. Operators can clean the cavity without disassembling bolts, improving maintenance efficiency and shortening production line downtime.

[0031] Please see Figure 2 , Figure 3 and Figure 4The inlet and outlet ends of the upper cooling channel 6 and the lower cooling channel 10 both extend outward through the inner walls of the upper mold base 1 and the lower mold base 2, respectively. These form independent cooling circuits. External cooling equipment injects circulating medium into the cooling channels through the extended ports. The medium flows along a preset path and absorbs heat from the mold, finally returning to the equipment from the outlet end to complete heat exchange. The extended design of the cooling channel inlets and outlets allows the mold to directly connect to external circulation pipes, preventing the cooling medium from stagnating inside the mold. Combined with the independent circuits of the upper cooling channel 6 and the lower cooling channel 10, this enables zoned temperature control of the mold base, reducing differences in aluminum molten solidification time. The inlet end of the upper cooling channel 6 corresponds to the outlet end of the lower mold base 2, and a hollow cylinder 7 is installed at the inlet end of the upper cooling channel 6. The inlet end of the upper cooling channel 6 corresponds to the outlet end of the lower mold base 2. After the cooling medium is injected from the inlet end of the upper mold base 1, it is guided into the cooling channel of the lower mold base 2 through the hollow cylinder 7, forming a dynamic balance of the temperature field of the mold base and preventing leakage. Positioning rods 8 are installed around the bottom of the upper mold base 1, and positioning holes 9 are opened around the top of the lower mold base 2. The positioning rods 8 around the bottom of the upper mold base 1 are aligned with the positioning holes 9 around the top of the lower mold base 2 and inserted. The mechanical limiting eliminates the mold closing gap, ensuring that the cavity is completely sealed after the upper mold base 1 and the lower mold base 2 are closed. The mechanical limiting structure of the positioning rods 8 and the positioning holes 9 eliminates the mold closing deviation, avoids aluminum liquid leakage or blank flash defects caused by mold misalignment, and reduces the wear of the guide mechanism caused by the mold closing impact, thus extending the service life of the mold.

[0032] Please see Figure 4 and Figure 5 The inner wall of the dividing groove 11 has limiting grooves 13 on both sides, and limiting rails 14 are slidably connected to the inner cavity of the limiting grooves 13. The limiting rails 14 are connected to the partition plate 12. The sliding fit between the limiting grooves 13 in the dividing groove 11 and the upper limiting rails 14 in the partition plate 12 allows the limiting rails 14 on both sides of the partition plate 12 to slide into the limiting grooves 13 on the inner wall of the dividing groove 11 until the partition plate 12 is completely embedded in the inner cavity of the dividing groove 11. The groove and rail fit achieves axial and radial dual limiting of the partition plate 12. The sliding fit between the limiting grooves 13 in the dividing groove 11 and the upper limiting rails 14 in the partition plate 12 prevents the partition plate 12 from shifting or falling off due to the pressure of the molten aluminum during the die casting process, ensuring the stability of the isolation structure at the bottom of the cavity and improving production safety.

[0033] Please see Figure 6The ejector assembly 4 includes a lifting seat 18, with ejector pins 19 mounted on the top of the lifting seat 18, and the ejector pins 19 corresponding to the ejector pin holes 3. Electric push rods 20 are mounted on both sides of the lifting seat 18. The electric push rods 20 drive the lifting seat 18 to rise vertically, causing the ejector pins 19 to move along the axis of the ejector pin holes 3. After the end of the ejector pin 19 contacts the lower surface of the workpiece, the workpiece is ejected from the cavity of the lower mold base 2 by a continuously applied ejection force. The ejector assembly 4 uses electric push rods 20 to drive the lifting seat 18. Through the design of the ejector pins 19 corresponding to the ejector pin holes 3, the vertical transmission of the ejection force is achieved, avoiding the lateral force that may be generated by traditional hydraulic ejection mechanisms, reducing the risk of stress concentration inside the workpiece. Simultaneously, the four sets of electric push rods 20 are connected to an external power supply and operate synchronously under the control of the controller and control system.

[0034] This solution involves inserting the positioning rod 8 at the bottom of the upper mold base 1 into the positioning hole 9 at the top of the lower mold base 2, achieving precise closure of the mold base through mechanical limiting, and forming a closed aluminum alloy die-casting cavity. The pipes of the external cooling equipment are connected to the inlet and outlet ends of the upper cooling channel 6 and the lower cooling channel 10 respectively to ensure that the cooling medium circulation loop is unobstructed. The upper cooling channel 6 feed end forms a medium flow path with the lower mold base 2 discharge end through the hollow cylinder 7. The limiting rails 14 on both sides of the partition plate 12 slide into the limiting grooves 13 on the inner wall of the dividing groove 11 until the partition plate 12 is completely embedded in the inner cavity of the dividing groove 11, thus physically isolating the bottom of the cavity of the lower mold base 2. The outer connecting baffles 15 on the front and back of the lower mold base 2 are rotated so that their backs are tightly attached to the front and back of the partition plate 12. Molten aluminum alloy liquid is injected into the cavity through the liquid inlet pipe 5 on the upper surface of the upper mold base 1. The aluminum liquid fills the processing area defined by the partition plate 12 along the preset flow channel. The upper cooling channel 6 and the lower cooling channel 10 start synchronously, and the mold temperature is controlled by circulating cooling medium. After the aluminum liquid cools and solidifies in the cavity, the locking of the external connecting baffle 15 is released and the mold is opened. The upper mold base 1 and the lower mold base 2 are separated. The partition plate 12 remains in place to prevent the incompletely solidified aluminum liquid from seeping into the ejector pin hole 3 area. The external connecting baffle 15 is rotated and the elastic protrusion 16 is engaged with the connecting concave hole 17 to separate the external connecting baffle 15 from the partition plate 12. The external connecting baffle 15 is pulled out from the dividing groove 11. The electric push rod 20 in the ejector assembly 4 is activated to drive the lifting seat 18 to drive the ejector pin 19 to rise vertically along the ejector pin hole 3. After the end of the ejector pin 19 contacts the lower surface of the blank, the blank is ejected from the cavity of the lower mold base 2 by the continuously applied ejection force.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A die-casting mold for aluminum alloy parts, characterized in that, include: The upper mold base (1) and the lower mold base (2) are disposed on the lower surface of the upper mold base (1). The upper surface of the upper mold base (1) is connected to the liquid inlet pipe (5). The lower surface of the lower mold base (2) is uniformly provided with ejector pin holes (3). An ejector assembly (4) is added below the lower mold base (2). The upper cooling channel (6) and the lower cooling channel (10) are respectively provided in the inner cavity of the upper mold base (1) and the lower mold base (2). The dividing groove (11) has a front side of the lower mold base (2), and a partition plate (12) is inserted and connected to the inner cavity of the dividing groove (11). The partition plate (12) is located at the bottom of the cavity of the lower mold base (2). An external connecting baffle (15) is rotatably connected to the front and back of the lower mold base (2), and an elastic protrusion (16) is installed on the back of the external connecting baffle (15), and a connecting recess (17) is provided above the elastic protrusion (16).

2. The aluminum alloy die-casting mold according to claim 1, characterized in that: The inlet and outlet ends of the upper cooling channel (6) and the lower cooling channel (10) both extend outward through the inner walls of the upper mold base (1) and the lower mold base (2).

3. The aluminum alloy die-casting mold according to claim 2, characterized in that: The feeding end of the upper cooling channel (6) and the discharging end of the lower mold base (2) are in a corresponding positional relationship, and hollow cylinders (7) are installed at the feeding end of the upper cooling channel (6).

4. The aluminum alloy die-casting mold according to claim 1, characterized in that: The upper mold base (1) is equipped with positioning rods (8) around its bottom, and the lower mold base (2) is provided with positioning holes (9) around its top.

5. The aluminum alloy die-casting mold according to claim 1, characterized in that: The inner walls of the dividing groove (11) are provided with limiting grooves (13) on both sides, and limiting rails (14) are slidably connected to the inner cavity of the limiting grooves (13), and the limiting rails (14) are connected to the dividing plate (12).

6. The aluminum alloy die-casting mold according to claim 5, characterized in that: The top material assembly (4) includes a lifting seat (18), and a top pin (19) is installed on the top of the lifting seat (18), with the top pin (19) corresponding to the position of the top pin hole (3), and electric push rods (20) are installed on both sides of the lifting seat (18).

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