A local pressurization device for reducing the leakage rate of a die-casting mold

Abstract

The utility model provides a kind of die casting die reduces local pressurizing device of leakage rate, belong to die casting die technical field, the die casting die reduces local pressurizing device of leakage rate, including fixed mould;Movable die, movable die sliding connection with the inner surface of fixed mould, the inner surface of fixed mould and movable die is all provided with support seat;Mounting seat, mounting seat fixed connection is in the upper end of movable die, the upper end of mounting seat is provided with rotating groove, the inner surface of rotating groove is slidably connected with sealing block;Multiple sockets, multiple sockets are all fixed connection with the upper inner wall of movable die, realize accurate and efficient local feeding, fundamentally effectively eliminate the shrinkage and shrinkage that lead to leakage, significantly reduce the leakage rate of casting, ensure the stability and reliability of pressurizing process, effectively enhance the system rigidity, prevent the retraction and vibration of pressurizing block under high pressure, ensure the stability of pressure maintaining process, to ensure that the feeding effect is uniform and reliable.

Description

Technical Field

[0001] This utility model belongs to the field of die casting mold technology, specifically relating to a local pressure device for reducing leakage rate in die casting molds. Background Technology

[0002] During the die casting process, for castings with thick-walled structures, the molten metal in the thick-walled sections (hot spots) solidifies last, and is prone to internal shrinkage cavities and porosity defects due to insufficient compensation for solidification shrinkage. When these defects are distributed in parts of the casting that require airtightness or liquid tightness, it can lead to media leakage, causing functional failure and scrapping of the product.

[0003] Currently, common industry solutions to this problem include optimizing the mold gating system and overflow groove design, increasing the final boost pressure of the die-casting machine's main injection system, or performing subsequent impregnation treatment on the molded castings. However, optimizing the gating system has limited effectiveness in improving deep internal shrinkage cavities; increasing the system boost pressure makes it difficult to effectively compensate for shrinkage in thick-walled areas far from the ingate due to pressure transmission attenuation, and it also easily increases the risk of mold bulging and equipment load; impregnation treatment is a post-treatment remedial measure, which not only increases production costs and processes, but also has uncertain long-term reliability of its sealing effect.

[0004] Therefore, the existing technology lacks a device that can accurately, timely and efficiently feed the thick-walled parts of castings, which makes it difficult to control the internal quality of thick-walled die castings, resulting in high product leakage rate and high production costs. Utility Model Content

[0005] The purpose of this invention is to provide a local pressurization device for reducing leakage rate in die-casting molds. It aims to solve the problems of the limited effect of the optimized gating system on improving deep internal shrinkage cavities in the existing technology, the difficulty in effectively compensating for the thick-walled area far from the ingate due to pressure transmission attenuation when increasing the system pressure, and the risk of mold expansion and equipment load. Impregnation treatment is a post-treatment measure, which not only increases production costs and processes, but also has the problem of uncertainty in the long-term reliability of its sealing effect.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A localized pressurization device for reducing leakage rate in die-casting molds includes: Fixed mold; The moving mold is slidably connected to the inner surface of the fixed mold, and both the inner surfaces of the fixed mold and the moving mold are provided with support seats; Mounting base, the mounting base is fixedly connected to the upper end of the moving mold, the upper end of the mounting base is provided with a rotating groove, and a sealing block is slidably connected to the inner surface of the rotating groove; Multiple sockets are fixedly connected to the upper inner wall of the moving mold, and multiple insertion blocks are fixedly connected to the lower inner wall of the fixed mold. The inner surfaces of the multiple sockets and the outer surfaces of the multiple insertion blocks are slidably connected. A pressurizing mechanism is provided within the mounting base to apply pressure to the interior of the fixed mold and the moving mold.

[0007] As a preferred embodiment of this utility model, the pressurizing mechanism includes: Multiple lead screws, the lower ends of which movably pass through the lower inner wall of the rotating groove and are rotatably connected to the upper end of the fixed mold, and nuts are threaded onto the circumferential surfaces of the multiple lead screws; Multiple pressure rods, the upper ends of which are fixedly connected to the lower ends of multiple nuts and movably penetrate the upper inner wall of the moving mold, and the lower ends of the multiple pressure rods are all fixedly connected to a fixed seat, and the lower ends of the fixed seats are all fixedly connected to a pressure block; A drive assembly, which is disposed within a mounting base, is provided to drive multiple lead screws to rotate.

[0008] As a preferred embodiment of this utility model, the driving component includes: The motor is fixedly connected to the upper end of the sealing block and movably passes through the lower end of the sealing block. The output end of the motor is fixedly connected to a drive gear. The outer surface of the motor is provided with a protective shell. The upper ends of the multiple lead screws are all fixedly connected to driven gears. The drive gear and the multiple driven gears are all meshed.

[0009] In a preferred embodiment of this utility model, one end of each of the plurality of nuts is fixedly connected to a connecting block, and the lower end of the connecting block is fixedly connected to a limiting seat.

[0010] As a preferred embodiment of this utility model, it further includes a support mechanism, the support mechanism comprising: A sliding shell is fixedly connected to the lower end of a connecting block. An extrusion seat is slidably connected to the inner surface of the sliding shell. A support rod is fixedly connected to the lower end of the extrusion seat. A support pad is fixedly connected to the outer surface of the support rod. The lower end of the support pad is fixedly connected to the upper end of the moving mold. An elastic component is disposed within the sliding shell to support the sliding compression seat.

[0011] As a preferred embodiment of this utility model, the elastic component includes: An extrusion shell is fixedly connected to the inner surface of a sliding shell. An extrusion rod is slidably connected to the inner surface of the extrusion shell. The lower end of the extrusion rod is fixedly connected to the inner surface of the extrusion seat. A spring is sleeved on the outer surface of the extrusion shell.

[0012] As a preferred embodiment of this utility model, the outer surface of the mounting base is fixedly connected with multiple support blocks, and the outer surface of the mounting base is provided with multiple heat dissipation grooves.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. In this solution, by starting the motor, the meshing of the driving gear and driven gear drives multiple lead screws to rotate synchronously. The rotation of the lead screws causes the nut to move downward in a straight line, which drives the pressure block to extend into the cavity through the pressure rod, applying local pressure to the internal molten metal. After pressurization is completed, the motor reverses, driving the pressure block to exit the cavity and reset. This achieves precise and efficient local feeding, fundamentally and effectively eliminating shrinkage cavities and porosity that cause leakage, significantly reducing the leakage rate of castings, ensuring the stability and reliability of the pressurization process, effectively enhancing the rigidity of the system, preventing the pressure block from shrinking and vibrating under high pressure, ensuring the stability of the pressure holding process, and thus ensuring the uniformity and reliability of the feeding effect.

[0014] 2. In this scheme, the extrusion seat inside the sliding shell moves upward relative to the support rod and the support pad, compressing the elastic component composed of the extrusion rod and the spring. The reaction force generated by the spring acts on the nut through the extrusion seat, the sliding shell and the connecting block, forming an auxiliary support force, enhancing the rigidity of the system, and helping to suppress vibration and rebound during the pressurization process, ensuring the stability of the pressure block during the pressure holding stage. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a perspective view of the present utility model; Figure 2 This is a first perspective sectional view of the present invention; Figure 3 This is a second perspective sectional view of the present invention; Figure 4 This utility model Figure 3 Enlarged view of section A in the image; Figure 5 This is the first exploded view of this utility model; Figure 6 This is the second exploded view of this utility model.

[0016] In the diagram: 1. Fixed mold; 2. Moving mold; 3. Mounting base; 4. Sealing block; 5. Protective shell; 6. Motor; 7. Support base; 8. Insert block; 9. Socket; 10. Driving gear; 11. Driven gear; 12. Lead screw; 13. Nut; 14. Pressure rod; 15. Connecting block; 16. Rotating groove; 17. Fixed base; 18. Pressure block; 19. Sliding shell; 20. Extrusion shell; 21. Spring; 22. Extrusion rod; 23. Extrusion seat; 24. Support rod; 25. Support pad; 26. Limiting seat; 27. Support block; 28. Heat dissipation groove. Detailed Implementation

[0017] 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.

[0018] Example 1 Please see Figure 1-6 The present invention provides the following technical solution: A localized pressurization device for reducing leakage rate in die-casting molds includes: Fixed mold (1); The moving mold (2) is slidably connected to the inner surface of the fixed mold (1), and both the inner surfaces of the fixed mold (1) and the moving mold (2) are provided with support seats (7). Mounting base (3), the mounting base (3) is fixedly connected to the upper end of the moving mold (2), the upper end of the mounting base (3) is provided with a rotating groove (16), and a sealing block (4) is slidably connected to the inner surface of the rotating groove (16). Multiple sockets (9) are fixedly connected to the upper inner wall of the moving mold (2), and multiple plugs (8) are fixedly connected to the lower inner wall of the fixed mold (1). The inner surfaces of the multiple sockets (9) and the outer surfaces of the multiple plugs (8) are slidably connected. A pressurizing mechanism is provided in the mounting base (3) to pressurize the interior of the fixed mold (1) and the moving mold (2).

[0019] In a specific embodiment of this utility model, the fixed mold 1 serves as the fixed part of the mold, connected to the fixed template of the die-casting machine. Its inner surface forms part of the cavity, providing a forming surface for the casting. The moving mold 2 serves as the movable part of the mold, connected to the moving template of the die-casting machine. It can move relative to the fixed mold 1 during mold closing and opening, forming a complete cavity together with the fixed mold 1. Two fixed support seats 7 provide support and protection for the internal components. The mounting seat 3 is fixed to the upper end of the moving mold 2, providing a stable mounting base for the pressurizing mechanism and transferring the load during the operation of the mechanism to the moving mold 2. The rotating groove 16 is opened on the upper end of the mounting seat 3 for the rotation of the lead screw 12. The moving mold 12 provides space and restricts its radial movement, ensuring its rotational stability. The sealing block 4 slides within the rotating groove 16 to seal the upper space of the rotating groove 16, preventing external impurities from entering. It also provides an installation position for the motor 6. The socket 9 is fixed to the upper inner wall of the moving mold 2 and cooperates with the insert block 8 on the fixed mold 1. It plays a guiding and positioning role during mold closing, ensuring accurate alignment between the moving mold 2 and the fixed mold 1. The lower end of the screw 12 is rotatably connected to the upper end of the fixed mold 1. Under the drive of the drive assembly, it rotates, converting the rotational motion into the linear motion of the nut 13. The nut 13 is threadedly connected to the screw 12, converting the rotational motion of the screw 12 into its own linear up-and-down motion, thereby driving the pressure rod 14. The pressure block 18 moves, and the upper end of the pressure rod 14 is connected to the nut 13, which transmits the linear motion of the nut 13 to the pressure block 18 and guides the movement direction of the pressure block 18. The fixing seat 17 connects the pressure rod 14 and the pressure block 18 to ensure the stable installation of the pressure block 18. The pressure block 18 acts directly on the molten metal in the cavity, applying local pressure to compensate for the solidification shrinkage of the metal and reduce shrinkage defects. The motor 6 is used as a power source to output rotational motion. The driving gear 10 is fixed to the output end of the motor 6 and transmits the power of the motor 6 to the driven gear 11. The protective shell 5 is covered on the outer surface of the motor 6 to protect the motor 6 from damage by the external environment. According to multiple driven gears 11 and Multiple lead screws 12 are fixed and mesh with the drive gear 10, transmitting power to the multiple lead screws 12 to achieve synchronous rotation. This enables precise and efficient local feeding, effectively eliminating shrinkage cavities and porosity that cause leakage, significantly reducing the leakage rate of castings, ensuring the stability and reliability of the pressurization process, effectively enhancing system rigidity, preventing the pressure block from shrinking and vibrating under high pressure, and ensuring the stability of the pressure holding process. This ensures the uniformity and reliability of the feeding effect. It should be noted that the specific model of motor 6 used is to be selected by those skilled in the art, and the motor 6 mentioned above is all existing technology, which will not be elaborated upon in this solution.

[0020] Please refer to the details. Figure 6 The pressurization mechanism includes: Multiple lead screws 12, the lower ends of which all movably pass through the lower inner wall of the rotating groove 16 and are rotatably connected to the upper end of the fixed mold 1, and nuts 13 are threaded onto the circumferential surface of the multiple lead screws 12. Multiple pressure rods 14 are provided, with their upper ends fixedly connected to the lower ends of multiple nuts 13 and movably penetrating the upper inner wall of the moving mold 2. Each pressure rod 14 has a fixed base 17 fixedly connected to its lower end, and each fixed base 17 has a fixed pressure block 18 fixedly connected to its lower end. A drive assembly is disposed within the mounting base 3 to drive the rotation of multiple lead screws 12.

[0021] In this embodiment: the lower end of the lead screw 12 is rotatably connected to the upper end of the fixed mold 1. Driven by the drive assembly, it rotates, converting the rotational motion into the linear motion of the nut 13. The nut 13 is threadedly connected to the lead screw 12, converting the rotational motion of the lead screw 12 into its own linear up-and-down motion, which in turn drives the pressure rod 14 and the pressure block 18 to move. The upper end of the pressure rod 14 is connected to the nut 13, transmitting the linear motion of the nut 13 to the pressure block 18 and guiding the direction of movement of the pressure block 18. The fixed base 17 connects the pressure rod 14 and the pressure block 18, ensuring the stable installation of the pressure block 18. The pressure block 18 acts directly on the molten metal in the cavity, applying local pressure to compensate for the solidification shrinkage of the metal and reduce shrinkage defects. The motor 6 serves as the power source, outputting rotational motion. The drive gear 10 is fixed to the output end of the motor 6, transmitting the power of the motor 6 to the driven gear 11. The protective shell 5 covers the outer surface of the motor 6 to protect it from external environmental damage. Multiple driven gears 11 and multiple lead screws 12 are fixed together and mesh with the drive gear 10, transmitting power to the multiple lead screws 12 to achieve synchronous rotation of the multiple lead screws 12.

[0022] Please refer to the details. Figure 6 The driving components include: Motor 6 is fixedly connected to the upper end of sealing block 4 and movably passes through the lower end of sealing block 4. The output end of motor 6 is fixedly connected to drive gear 10. A protective shell 5 is provided on the outer surface of motor 6. Driven gear 11 is fixedly connected to the upper end of multiple lead screws 12. Driven gear 10 and multiple driven gears 11 are meshed with each other.

[0023] In this embodiment: the motor 6 is used as the power source to output rotational motion. The driving gear 10 is fixed to the output end of the motor 6 and transmits the power of the motor 6 to the driven gear 11. The protective shell 5 is covered on the outer surface of the motor 6 to protect the motor 6 from damage by the external environment. Multiple driven gears 11 and multiple lead screws 12 are fixed and mesh with the driving gear 10 to transmit power to multiple lead screws 12, so as to realize the synchronous rotation of multiple lead screws 12.

[0024] Please refer to the details. Figure 4 and Figure 6 Each of the multiple nuts 13 has a connecting block 15 fixedly connected to one end, and a limit seat 26 is fixedly connected to the lower end of the connecting block 15.

[0025] In this embodiment: the connecting block 15 is fixed to one end of the nut 13 and is used to connect the support mechanism and transmit the movement state of the nut 13 to the support mechanism. The limiting seat 26 is fixed to the lower end of the connecting block 15 and is used to limit the movement stroke of the nut 13 to prevent overshoot.

[0026] Please refer to the details. Figure 4 It also includes supporting institutions, which include: The sliding shell 19 is fixedly connected to the lower end of the connecting block 15. The inner surface of the sliding shell 19 is slidably connected to the extrusion seat 23. The lower end of the extrusion seat 23 is fixedly connected to the support rod 24. The outer surface of the support rod 24 is fixedly connected to the support pad 25. The lower end of the support pad 25 is fixedly connected to the upper end of the moving mold 2. An elastic component is disposed within the sliding housing 19 to support the sliding compression seat 23.

[0027] In this embodiment: a fixed sliding shell 19 serves as the housing of the elastic component and guides the sliding direction of the extrusion seat 23. The extrusion seat 23 slides within the sliding shell 19, transmitting the supporting force of the elastic component to the support rod 24. The support rod 24 connects the extrusion seat 23 and the support pad 25, transmitting the supporting force. The lower end of the support pad 25 is fixed to the upper end of the moving mold 2, providing a stable support foundation for the entire support mechanism. Simultaneously, the extrusion shell 20 provides guidance and installation positions for the spring 21 and the extrusion rod 22. Thus, the extrusion rod 22 transmits the movement of the extrusion seat 23 to the spring 21 and compresses the spring 21. The spring 21, sleeved on the outer surface of the extrusion shell 20, provides elastic force to support and buffer the movement of the extrusion seat 23 and its connecting components.

[0028] Please refer to the details. Figure 4 The resilient components include: The extrusion shell 20 is fixedly connected to the inner surface of the sliding shell 19. An extrusion rod 22 is slidably connected to the inner surface of the extrusion shell 20. The lower end of the extrusion rod 22 is fixedly connected to the inner surface of the extrusion seat 23. A spring 21 is sleeved on the outer surface of the extrusion shell 20.

[0029] In this embodiment: the extrusion shell 20 provides guidance and mounting position for the spring 21 and the extrusion rod 22, so that the extrusion rod 22 transmits the movement of the extrusion seat 23 to the spring 21 and compresses the spring 21. The spring 21 is sleeved on the outer surface of the extrusion shell 20 to provide elastic force, which is used to support and buffer the movement of the extrusion seat 23 and its connecting parts.

[0030] Please refer to the details. Figure 6 Multiple support blocks 27 are fixedly connected to the outer surface of the mounting base 3, and multiple heat dissipation grooves 28 are opened on the outer surface of the mounting base 3.

[0031] In this embodiment: multiple fixed support blocks 27 are used to enhance the connection rigidity between the mounting base 3 and the moving mold 2, and multiple heat dissipation slots 28 are used to increase the heat dissipation area and promote the heat dissipation of components such as the motor 6 during operation.

[0032] The working principle and usage process of this utility model are as follows: During mold closing, the moving mold 2 moves towards the fixed mold 1, achieving precise alignment through the cooperation of the insert block 8 and the socket 9 to form a complete cavity. When local pressure is required, the motor 6 is started, driving multiple lead screws 12 to rotate synchronously through the meshing of the drive gear 10 and the driven gear 11. The rotation of the lead screws 12 causes the nut 13 to move downward linearly, driving the pressure block 18 to extend into the cavity through the pressure rod 14, applying local pressure to the internal molten metal. During the pressure application process, the connecting block 15, which moves downward with the nut 13, compresses the spring 21 through the sliding shell 19. The reaction force of the spring 21 provides stable support for the moving parts, enhancing the rigidity of the system and ensuring the stability of pressure holding. After pressure application is completed, the motor 6 reverses, driving the pressure block 18 to exit the cavity and reset. Finally, the moving mold 2 separates from the fixed mold 1, ejecting the casting and completing the work cycle.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A local pressurization device for reducing leakage rate in die-casting molds, characterized in that, include: Fixed mold (1); The moving mold (2) is slidably connected to the inner surface of the fixed mold (1), and both the inner surfaces of the fixed mold (1) and the moving mold (2) are provided with support seats (7). Mounting base (3), the mounting base (3) is fixedly connected to the upper end of the moving mold (2), the upper end of the mounting base (3) is provided with a rotating groove (16), and a sealing block (4) is slidably connected to the inner surface of the rotating groove (16). Multiple sockets (9) are fixedly connected to the upper inner wall of the moving mold (2), and multiple plugs (8) are fixedly connected to the lower inner wall of the fixed mold (1). The inner surfaces of the multiple sockets (9) and the outer surfaces of the multiple plugs (8) are slidably connected respectively. as well as A pressurizing mechanism is provided in the mounting base (3) to pressurize the interior of the fixed mold (1) and the moving mold (2).

2. The local pressurization device for reducing leakage rate of die-casting molds according to claim 1, characterized in that: The pressurization mechanism includes: Multiple lead screws (12), the lower ends of the multiple lead screws (12) all movably pass through the lower inner wall of the rotating groove (16) and are rotatably connected to the upper end of the fixed mold (1), and the circumferential surfaces of the multiple lead screws (12) are all threaded with nuts (13). Multiple pressure rods (14) are provided, with the upper ends of the multiple pressure rods (14) fixedly connected to the lower ends of multiple nuts (13) and movably penetrating the upper inner wall of the moving mold (2). The lower ends of the multiple pressure rods (14) are all fixedly connected to a fixed seat (17), and the lower ends of the fixed seat (17) are all fixedly connected to a pressure block (18). A drive assembly is disposed within a mounting base (3) to drive multiple lead screws (12) to rotate.

3. The local pressurization device for reducing leakage rate of die-casting mold according to claim 2, characterized in that: The driving component includes: The motor (6) is fixedly connected to the upper end of the sealing block (4) and moves through the lower end of the sealing block (4). The output end of the motor (6) is fixedly connected to the drive gear (10). The outer surface of the motor (6) is provided with a protective shell (5). The upper ends of the multiple lead screws (12) are fixedly connected to driven gears (11). The drive gear (10) and the multiple driven gears (11) mesh with each other.

4. The local pressurization device for reducing leakage rate of die-casting mold according to claim 3, characterized in that: One end of each of the nuts (13) is fixedly connected to a connecting block (15), and the lower end of the connecting block (15) is fixedly connected to a limiting seat (26).

5. The local pressurization device for reducing leakage rate of die-casting mold according to claim 4, characterized in that: It also includes a support mechanism, which includes: A sliding shell (19) is fixedly connected to the lower end of a connecting block (15). An extrusion seat (23) is slidably connected to the inner surface of the sliding shell (19). A support rod (24) is fixedly connected to the lower end of the extrusion seat (23). A support pad (25) is fixedly connected to the outer surface of the support rod (24). The lower end of the support pad (25) is fixedly connected to the upper end of the moving mold (2). An elastic component is disposed within the sliding shell (19) to support the sliding compression seat (23).

6. The local pressurization device for reducing leakage rate of die-casting mold according to claim 5, characterized in that: The elastic component includes: The extrusion shell (20) is fixedly connected to the inner surface of the sliding shell (19). An extrusion rod (22) is slidably connected to the inner surface of the extrusion shell (20). The lower end of the extrusion rod (22) is fixedly connected to the inner surface of the extrusion seat (23). A spring (21) is sleeved on the outer surface of the extrusion shell (20).

7. The local pressurization device for reducing leakage rate of die-casting molds according to claim 6, characterized in that: Multiple support blocks (27) are fixedly connected to the outer surface of the mounting base (3), and multiple heat dissipation grooves (28) are opened on the outer surface of the mounting base (3).

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