A vacuum die casting mold using a knockout pin hole as a local vacuum passage

Abstract

The utility model discloses a kind of vacuum die casting mould using ejector rod hole as local partial vacuum extraction passage, including ejector rod and vacuum joint, movable mould core is arranged in movable mould frame, fixed mould core is arranged in fixed mould frame, fixed mould core and movable mould core form product cavity after mould closing, fixed mould frame is also provided with ejector rod bottom plate, ejector rod is set on ejector rod bottom plate, fixed mould core is provided with the ejector rod hole that cooperates with ejector rod and the exhaust hole connected with ejector rod hole, vacuum joint is set on fixed mould frame, vacuum joint is connected with vacuum equipment.The utility model ingeniously forms exhaust passage at ejector rod, and gathers and connects exhaust hole, forms vacuum extraction structure, so that heat dissipation rib place is evacuated, guarantee that aluminium liquid fills fully.Exhaust passage gap is set to be between 0.1-0.15mm, i. e. guarantee the efficiency of gas passing, simultaneously guarantee that aluminium liquid does not enter exhaust passage, avoid blockage, cause subsequent maintenance difficulty.

Description

Technical Field

[0001] This utility model relates to the field of molds, and in particular to a vacuum die-casting mold that uses a push rod hole as a local vacuum channel. Background Technology

[0002] The multimedia central control system is a relatively closed environment. During operation, the electrical components will release a lot of heat. If the heat cannot be dissipated in a timely and effective manner, the temperature of the central control system will rise sharply. Once the temperature exceeds the limit, it will cause the central control system to malfunction, which will affect the normal operation of the car and cause major driving safety hazards, especially for new energy vehicles.

[0003] Multimedia central control systems typically cool down using physical methods, with fan cooling being the most effective solution. This involves designing several heat dissipation fins on the casing, with air inlets and outlets at both ends of each fin. A fan is installed at one end of each fin. Air enters through the air inlet, is blown away by the fan, carrying away the heat from the heat dissipation fins, and is then exhausted through the air outlet, achieving the purpose of cooling.

[0004] To ensure the heat dissipation effect of the cooling fins, the surface area of ​​the fins needs to be as large as possible. The larger the surface area in contact with the air, the more heat is carried away. Therefore, cooling fins are designed to be long and tall to increase their surface area. In addition, the thickness of the cooling fins is also relatively thin. The thinner the cooling fins, the better the heat dissipation and cooling effect.

[0005] Due to the unique structure of the cooling fins—long, tall, and thin—they form deep, narrow cavities embedded within the die-casting mold core. During the die-casting process, air cannot escape properly from these deep cavities, preventing the molten metal from filling them effectively. This results in poor fin formation and ultimately affects the cooling performance of the fins.

[0006] In die casting production, localized vacuuming is a very practical solution for poorly filled areas. The product's heat dissipation fins are quite deep, requiring ejector pins for demolding. However, these ejector pins occupy the space needed for localized vacuuming, making it impossible to implement localized vacuuming in the heat dissipation fin area. Utility Model Content

[0007] To address the shortcomings of existing technologies, the main objective of this invention is to overcome these deficiencies by disclosing a vacuum die-casting mold that uses an ejector pin hole as a local vacuum channel. The mold includes an ejector pin and a vacuum connector. A moving mold core is disposed within a moving mold frame, and a fixed mold core is disposed within a fixed mold frame. The fixed mold core and the moving mold core, when closed, form a product cavity. The fixed mold frame also includes an ejector pin base plate, with the ejector pin disposed on the ejector pin base plate. The fixed mold core has an ejector pin hole that mates with the ejector pin and an exhaust hole radially connected to the ejector pin hole. The vacuum connector is disposed on the fixed mold frame and connected to a vacuum device.

[0008] Furthermore, the push rod hole includes an exhaust portion, a connecting portion, and a guide portion. An exhaust channel is formed between the push rod and the exhaust portion, which communicates with the connecting portion. The connecting portion is connected to the exhaust hole.

[0009] Furthermore, the gap in the exhaust passage is 0.1-0.15mm.

[0010] Furthermore, the push rod includes a continuously arranged ejector end and a guide end, the push rod is slidably connected to the push rod hole, the guide end is placed inside the guide portion, and the ejector end is placed inside the exhaust portion.

[0011] Furthermore, a sealing ring is fitted onto the guide end, and the sealing ring is used to seal and connect with the guide portion.

[0012] The beneficial effects achieved by this utility model are:

[0013] This invention ingeniously forms an exhaust channel at the ejector rod, which converges and connects to the exhaust hole to create a vacuum structure. This allows for vacuuming at the heat dissipation fins, ensuring sufficient filling of the molten aluminum. The gap in the exhaust channel is set between 0.1-0.15mm, ensuring efficient gas passage while preventing molten aluminum from entering the exhaust channel, thus avoiding blockages and subsequent maintenance difficulties. The ejector rod is equipped with a guide section to ensure its strength and stability during movement. A sealing ring is also included to seal the guide section and guide end, isolating the cavity from the outside environment and ensuring the effective vacuuming. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the product;

[0015] Figure 2 This is a schematic diagram of the structure of a vacuum die-casting mold that uses a push rod hole as a local vacuum channel according to the present invention;

[0016] Figure 3 , 4 This is a schematic diagram of the internal structure of a vacuum die-casting mold that uses a push rod hole as a local vacuum channel according to the present invention.

[0017] Figure 5 This is a schematic diagram of the top rod structure;

[0018] Figure 6 This is a schematic diagram illustrating the usage of a vacuum die-casting mold that uses a push rod hole as a local vacuum channel according to this utility model.

[0019] The attached figures are labeled as follows:

[0020] 1. Ejector pin, 2. Vacuum connector, 3. Vent hole, 4. Sealing ring, 6. Moving mold frame, 7. Moving mold core, 8. Fixed mold frame, 9. Fixed mold core, 10. Ejector pin base plate, 11. Ejector end, 12. Guide end, 81. Vent part, 82. Connecting part, 83. Guide part. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0022] A vacuum die-casting mold that uses a push rod hole as a local vacuum channel, such as Figures 1-6 As shown, the mold includes an ejector pin 1 and a vacuum connector 2. A moving mold core 7 is installed inside the moving mold frame 6, and a fixed mold core 9 is installed inside the fixed mold frame 8. After the fixed mold core 9 and the moving mold core 7 are closed, a product cavity is formed. The fixed mold frame 8 also has an ejector pin base plate 10, on which the ejector pin 1 is mounted. The fixed mold core 8 has an ejector pin hole that mates with the ejector pin 1 and an exhaust hole 3 that is radially connected to the ejector pin hole. The vacuum connector 2 is mounted on the fixed mold frame 8 and is connected to a vacuum device. The vacuum device connects to the vacuum connector 2 and provides negative pressure, allowing air in the cavity to first pass through the gap between the ejector pin 1 and the ejector pin hole, and then enter the exhaust hole 3 for discharge. Vacuuming is performed using the gap between the ejector pin 1 and the ejector pin hole to promote full filling of the heat dissipation fins.

[0023] In one embodiment, such as Figures 1-6 As shown, the push rod hole includes an exhaust part 81, a connecting part 82, and a guide part 83. An exhaust channel is formed between the push rod 1 and the exhaust part, which is connected to the connecting part. The connecting part 82 is connected to the exhaust hole 3.

[0024] In the above embodiments, such as Figures 1-6 As shown, the gap in the exhaust channel 81 is 0.1-0.15mm. Specifically, this gap is the sum of the gaps on both sides of the push rod 1. This ensures exhaust efficiency while effectively preventing molten aluminum from leaking out and causing blockage of the exhaust channel.

[0025] In one embodiment, such as Figures 1-6As shown, the push rod 1 includes a continuously disposed push-out end 11 and a guide end 12. The push rod 1 is slidably connected to the push rod hole. The guide end 12 is placed inside the guide portion 83, and the push-out end 11 is placed inside the vent portion 81. Preferably, the guide portion 12 is configured as a cylindrical structure to enhance the overall strength of the push rod 1.

[0026] In one embodiment, such as Figures 1-6 As shown, a sealing ring 4 is fitted onto the guide end 12, and the sealing ring 4 is used to seal the connection with the guide part 83. The sealing ring 4 seals the guide part 83 and the guide end 12, thus isolating the cavity from the outside.

[0027] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of implementation of the present utility model. Any modifications or equivalent substitutions to the present utility model without departing from the spirit and scope thereof should be covered within the protection scope of the claims of the present utility model.

Claims

1. A vacuum die-casting mold that uses a push rod hole as a local vacuum channel, characterized in that, The device includes an ejector pin and a vacuum connector. A moving mold core is set inside a moving mold frame, and a fixed mold core is set inside a fixed mold frame. After the fixed mold core and the moving mold core are closed, a product cavity is formed. The fixed mold frame is also provided with an ejector pin base plate, and the ejector pin is set on the ejector pin base plate. The fixed mold core is provided with an ejector pin hole that mates with the ejector pin and an exhaust hole that is radially connected to the ejector pin hole. The vacuum connector is set on the fixed mold frame and is connected to a vacuum device.

2. A vacuum die-casting mold using a push rod hole as a local vacuum channel according to claim 1, characterized in that, The push rod hole includes an exhaust section, a connecting section, and a guide section. An exhaust channel is formed between the push rod and the exhaust section, which communicates with the connecting section. The connecting section is connected to the exhaust hole.

3. A vacuum die-casting mold using a push rod hole as a local vacuum channel according to claim 2, characterized in that, The clearance of the exhaust passage is 0.1-0.15mm.

4. A vacuum die-casting mold using a push rod hole as a local vacuum channel according to claim 2, characterized in that, The push rod includes a continuously arranged push-out end and a guide end. The push rod is slidably connected to the push rod hole. The guide end is placed inside the guide part, and the push-out end is placed inside the exhaust part.

5. A vacuum die-casting mold using a push rod hole as a local vacuum channel according to claim 4, characterized in that, A sealing ring is fitted onto the guide end, and the sealing ring is used to seal and connect with the guide portion.

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