Die-casting die applying embedded reverse-pushing core-pulling structure

Abstract

The die-casting die comprises an upper die base and a lower die base, an upper die core and a lower die core which are stacked up and down are installed between the upper die base and the lower die base, and a die cavity is formed between the upper die core and the lower die core. A plurality of external core-pulling devices and an embedded reverse-pushing core-pulling structure are arranged at the upper end of the lower die holder around the lower die core. The reverse pushing core pulling structure is integrated in the H-shaped cavity of the lower die base in an embedded mode, the problem that a traditional external core pulling mechanism occupies the external space of the die is solved, the external core pulling devices evenly arranged on the periphery are matched, reasonable layout of multidirectional core pulling is achieved, and the overall size of the die is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of die casting mold technology, and in particular to a die casting mold using an embedded reverse push core pulling structure. Background Technology

[0002] Previously, the common solutions to the interference between the slide cylinder's ejection angle and the press's main cylinder were: 1. Push the cylinder forward; 2. Adjust the product angle; 3. Change to an angled guide post. However, with increasingly higher requirements for product quality and stability, the traditional slide structure cannot meet the mold requirements. It is difficult to achieve a structure that uses a cylinder to open the slide without changing the mold angle.

[0003] In die casting, for die castings with complex structures such as side recesses and side holes, a core-pulling mechanism is required to complete the demolding operation after molding. The rationality of the core-pulling mechanism design directly affects the molding accuracy, production efficiency, and mold life of the die casting. Currently, the core-pulling mechanism of conventional die casting molds mostly adopts an external design, that is, the core-pulling cylinder and part of the slide are arranged on the outside of the mold. When the die casting has multiple side recesses in different directions, multiple external core-pulling cylinder mechanisms need to be arranged around the outside of the mold. The movement trajectories of multiple external core-pulling mechanisms are prone to intersecting, posing a serious risk of spatial interference, which can lead to the core-pulling action not being completed smoothly, or even damage to mold components or die castings. It is also necessary to consider whether the demolding angle of the cylinder will interfere with the main cylinder of the press.

[0004] To address the aforementioned issues, some molds employ a partially built-in core-pulling structure. However, existing built-in structures suffer from problems such as unreasonable layout, poor driving stability, and insufficient guiding accuracy, failing to meet the production requirements of high-precision and complex die-casting parts. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a die casting mold with an embedded reverse push core pulling structure. The reverse push core pulling structure is embedded and integrated into the H-shaped cavity of the lower mold base, which avoids the problem of the traditional external core pulling mechanism occupying the external space of the mold. With the external core pulling device evenly arranged on the outer periphery, a reasonable layout of multi-directional core pulling is achieved, which effectively reduces the overall volume of the mold.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: a die-casting mold with an embedded reverse-push core-pulling structure is provided, including an upper mold base and a lower mold base. An upper mold core and a lower mold core are installed between the upper mold base and the lower mold base, and a mold cavity is provided between the upper mold core and the lower mold core. Multiple external core-pulling devices and an embedded reverse-push core-pulling structure are arranged around the lower mold core at the upper end of the lower mold base. The embedded reverse-push core-pulling structure includes a core-pulling block, a reverse-push seat, and a reverse-push cylinder. An upper cavity and a lower cavity are respectively opened on the upper and lower sides of the corner of the lower mold base. The upper cavity and the lower cavity form an H-shaped chamber structure. A horizontally sliding reverse-push seat is installed inside the upper cavity. A core-pulling block is provided at one end of the reverse-push seat and inserted into the mold cavity. A connecting plate is installed at the other end of the reverse-push seat. A reverse-push cylinder is installed inside the lower cavity. The piston rod of the reverse-push cylinder is connected and fixed to the lower part of the connecting plate.

[0007] As a supplement to the technical solution described in this invention, a mold foot is installed on each side of the lower end of the lower mold base, and a top plate assembly is installed between the two mold feet. Multiple push rods that are inserted into the mold cavity are vertically installed on the top plate assembly.

[0008] As a supplement to the technical solution described in this invention, the external core-pulling device includes a second core-pulling block, a core-pulling seat, and an external hydraulic cylinder. The core-pulling seat is slidably installed on the upper end of the lower mold base, and a second core-pulling block inserted into the mold cavity is provided at one end of the core-pulling seat. An external hydraulic cylinder connected to the core-pulling seat is installed on the outer side of the lower mold base.

[0009] As a supplement to the technical solution described in this invention, the lower mold base has multiple guide pillars arranged side by side between the upper cavity and the lower cavity, and the connecting plate is provided with guide sleeves that cooperate with the guide pillars.

[0010] As a supplement to the technical solution described in this invention, a step is provided on both sides of the lower cavity side opening, and the reverse thrust cylinder is fixed on the two steps by fasteners.

[0011] As a supplement to the technical solution described in this invention, pressure strips are installed on the inner walls of both sides of the upper cavity, and the two pressure strips press against the upper surfaces of the two sides of the reverse thrust seat respectively. A track block that cooperates with the reverse thrust seat is provided at the bottom of the upper cavity, and the upper surface of the track block is a smooth guide surface.

[0012] As a supplement to the technical solution described in this invention, the reverse thrust base is provided with a cooling pipe, one end of which extends into the core-pulling block.

[0013] Beneficial Effects: This invention relates to a die-casting mold employing an embedded reverse-push core-pulling structure. The reverse-push core-pulling structure is embedded and integrated into the H-shaped cavity of the lower mold base, avoiding the problem of traditional external core-pulling mechanisms occupying external space. Combined with externally arranged core-pulling devices evenly distributed around the periphery, a reasonable layout for multi-directional core pulling is achieved, effectively reducing the overall volume of the mold. Through the internal and external core-pulling layout design, the movement trajectories of the embedded reverse-push core-pulling structure and the external core-pulling device are independent and do not overlap, completely solving the spatial interference problem of multi-directional core-pulling mechanisms, ensuring smooth completion of each core-pulling action, and improving the stability of mold operation. The embedded reverse-pull core-pulling structure adopts an H-shaped chamber layout with coaxial upper and lower sections, resulting in a short force transmission path. Combined with the precise guidance of the guide pillars and sleeves, the sliding accuracy of the reverse-pull seat is high. At the same time, the pressure bar and track block in the upper cavity further enhance the sliding stability of the reverse-pull seat, ensuring the accurate positioning of the core-pulling block one, effectively guaranteeing the forming accuracy of complex parts of the die-casting, and improving the product qualification rate. The reverse-pull seat integrates cooling pipes that extend into the core-pulling block one. Through the circulation of cooling medium, heat can be efficiently removed, preventing thermal deformation of the reverse-pull seat and core-pulling block one due to high temperatures. At the same time, it accelerates the cooling and solidification of the die-casting, shortens the forming cycle, and improves production efficiency. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a schematic diagram of the structure of the lower mold base and lower mold core described in this invention; Figure 4 This is a schematic diagram of the lower mold base and the embedded reverse push core pulling structure described in this invention; Figure 5 This is a schematic diagram of the structure of the lower mold base described in this invention.

[0015] Diagram: 1. Upper mold base, 2. Upper mold core, 3. Mold cavity, 4. Lower mold core, 5. Lower mold base, 6. External core pulling device, 7. Embedded reverse push core pulling structure, 8. Mold foot, 9. Top plate assembly, 10. Ejector rod, 11. Core pulling block one, 12. Reverse push seat, 13. Cooling pipe, 14. Connecting plate, 15. Reverse push cylinder, 16. Guide pillar, 17. Core pulling block two, 18. Core pulling seat, 19. External cylinder, 20. Upper cavity, 21. Lower cavity, 22. Step, 23. Track block, 24. Pressure strip, 25. Guide sleeve. Detailed Implementation

[0016] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0017] Embodiments of the present invention relate to a die-casting mold employing an embedded reverse-pull core-pulling structure, such as... Figure 1-5 As shown, the die casting includes an upper mold base 1 and a lower mold base 5. An upper mold core 2 and a lower mold core 4 are stacked between the upper mold base 1 and the lower mold base 5. A mold cavity 3 is provided between the upper mold core 2 and the lower mold core 4. The upper end of the lower mold base 5 is surrounded by multiple external core pulling devices 6 and an embedded reverse push core pulling structure 7. The external core pulling devices 6 are used to pull the cores from the main concave parts of the die casting, and the embedded reverse push core pulling structure 7 is used to pull the cores from the concave parts in narrow spaces such as corners of the die casting. The two work together to achieve multi-directional complex core pulling, and the layout of external and internal devices effectively avoids spatial interference between the core pulling mechanisms.

[0018] The embedded reverse-push core-pulling structure 7 includes a core-pulling block 11, a reverse-push seat 12, and a reverse-push cylinder 15. An upper cavity 20 and a lower cavity 21 are respectively opened on the upper and lower sides of the corner of the lower mold base 5. The lower cavity 21 is located directly below the upper cavity 20, and the lower cavity 21 and the upper cavity 20 are coaxially arranged, forming an H-shaped chamber structure. A reverse-push seat 12 that can slide horizontally is installed inside the upper cavity 20. One end of the reverse-push seat 12 is provided with a core-pulling block 11 that is inserted into the mold cavity 3. The end of the core-pulling block 11 inserted into the mold cavity 3 is... The profile matches the concave structure around the die-cast part. A connecting plate 14 is installed at the other end of the thrust seat 12. A thrust cylinder 15 is installed inside the lower cavity 21. The piston rod of the thrust cylinder 15 is connected and fixed to the lower part of the connecting plate 14. The extension and retraction of the thrust cylinder 15 drives the connecting plate 14 and the thrust seat 12 to slide in the horizontal direction, thereby realizing the core pulling and resetting action of the core pulling block 11. The H-shaped cavity structure enables the thrust seat 12 and the thrust cylinder 15 to achieve coaxial linkage, shorten the force transmission path, and improve the driving stability.

[0019] As a preferred embodiment, the push-back seat 12 is provided with a cooling pipe 13. One end of the cooling pipe 13 extends into the core-pulling block 11, and the other end extends to the outside of the push-back seat 12 and is connected to a cooling medium conveying device. By circulating cooling medium such as cooling water or cooling oil through the cooling pipe 13 into the push-back seat 12 and the core-pulling block 11, the heat transferred to the push-back seat 12 and the core-pulling block 11 during the die-casting process can be quickly removed. It can also accelerate the cooling and solidification of the molten metal in the mold cavity 3 and improve production efficiency.

[0020] As a preferred embodiment, a mold foot 8 is installed on each side of the lower end of the lower mold base 5, and a top plate assembly 9 is installed between the two mold feet 8. Multiple ejector rods 10 that are inserted into the mold cavity 3 are vertically installed on the top plate assembly 9. After the product is die-cast, the ejector rods 10 are driven upward by the top plate assembly 9 to eject the die-cast part in the mold cavity 3, thus completing the demolding operation.

[0021] As a preferred embodiment, four to five external core-pulling devices 6 are provided. Each external core-pulling device 6 includes a second core-pulling block 17, a core-pulling seat 18, and an external hydraulic cylinder 19. The core-pulling seat 18 is slidably mounted on the upper end of the lower mold base 5. One end of the core-pulling seat 18 is provided with a second core-pulling block 17 that is inserted into the mold cavity 3. The second core-pulling block 17 is used to form the side recess or side hole of the corresponding part of the die casting. The external hydraulic cylinder 19 is mounted on the outer side wall of the lower mold base 5 through a hydraulic cylinder bracket. The piston rod of the external hydraulic cylinder 19 is connected to the end of the core-pulling seat 18 away from the mold cavity 3. The sliding of the core-pulling seat 18 is driven by the extension and retraction of the external hydraulic cylinder 19 to realize the core-pulling and resetting of the second core-pulling block 17.

[0022] As a preferred embodiment, to improve the sliding accuracy and stability of the push-back seat 12, multiple guide posts 16 are arranged side by side on the side of the lower mold base 5 between the upper cavity 20 and the lower cavity 21. The guide posts 16 are fixed to the lower mold base 5 by long bolts. A guide sleeve 25 that cooperates with the guide post 16 is provided on the vertical section of the connecting plate 14. The guide sleeve 25 is sleeved on the guide post 16 and can slide along the guide post 16. The cooperation between the guide post 16 and the guide sleeve 25 can accurately guide the sliding of the connecting plate 14 and the push-back seat 12, avoid the push-back seat 12 from deviating or getting stuck when sliding, and ensure the positioning accuracy of the core-pulling block 11.

[0023] As a preferred embodiment, a step 22 is provided on both sides of the side opening of the lower cavity 21. The cylinder end of the reverse thrust cylinder 15 is fixed to the two steps 22 by fasteners. This installation structure makes the installation of the reverse thrust cylinder 15 more stable and facilitates the disassembly and maintenance of the cylinder. At the same time, the side opening of the lower cavity 21 also provides sufficient space for the arrangement of pipelines and maintenance of the reverse thrust cylinder 15.

[0024] As a preferred embodiment, pressure strips 24 are installed on the inner walls of both sides of the upper cavity 20. The two pressure strips 24 press against the upper surfaces of the two sides of the push-back seat 12, forming a vertical limit on the push-back seat 12 and preventing it from moving up and down when sliding. A track block 23 that cooperates with the push-back seat 12 is provided at the bottom of the upper cavity 20. The track block 23 is fixed to the bottom of the upper cavity 20 by bolts. The upper surface of the track block 23 is a smooth guide surface. The lower surface of the push-back seat 12 contacts the guide surface of the track block 23. The track block 23 can reduce the friction when the push-back seat 12 slides, improve the smoothness of sliding, and at the same time avoid direct wear between the push-back seat 12 and the bottom of the upper cavity 20, thus extending the service life of the mold.

[0025] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0026] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0027] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0028] The above provides a detailed description of a die-casting mold with an embedded reverse push core-pulling structure provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A die-casting mold employing an embedded reverse-pull core-pulling structure, comprising an upper mold base (1) and a lower mold base (5), wherein an upper mold core (2) and a lower mold core (4) stacked vertically are installed between the upper mold base (1) and the lower mold base (5), and a mold cavity (3) is provided between the upper mold core (2) and the lower mold core (4), characterized in that: The lower mold base (5) is surrounded by a number of external core-pulling devices (6) and an embedded reverse-push core-pulling structure (7) at the upper end. The embedded reverse-push core-pulling structure (7) includes a core-pulling block (11), a reverse-push seat (12) and a reverse-push cylinder (15). The upper and lower sides of the corner of the lower mold base (5) are respectively provided with an upper cavity (20) and a lower cavity (21). The upper cavity (20) and the lower cavity (21) form an H-shaped cavity structure. The upper cavity (20) is equipped with a horizontally sliding reverse-push seat (12). One end of the reverse-push seat (12) is provided with a core-pulling block (11) inserted into the mold cavity (3). The other end of the reverse-push seat (12) is equipped with a connecting plate (14). The lower cavity (21) is equipped with a reverse-push cylinder (15). The piston rod of the reverse-push cylinder (15) is connected and fixed to the lower part of the connecting plate (14).

2. The die-casting mold using an embedded reverse-pull core-pulling structure according to claim 1, characterized in that: A mold foot (8) is installed on each side of the lower end of the lower mold base (5), and a top plate assembly (9) is installed between the two mold feet (8). Multiple push rods (10) that are inserted into the mold cavity (3) are vertically installed on the top plate assembly (9).

3. A die-casting mold using an embedded reverse-pull core-pulling structure according to claim 1, characterized in that: The external core-pulling device (6) includes a core-pulling block two (17), a core-pulling seat (18), and an external oil cylinder (19). The core-pulling seat (18) is slidably installed on the upper end of the lower mold base (5). One end of the core-pulling seat (18) is provided with a core-pulling block two (17) that is inserted into the mold cavity (3). An external oil cylinder (19) connected to the core-pulling seat (18) is installed on the outer side of the lower mold base (5).

4. A die-casting mold using an embedded reverse-pull core-pulling structure according to claim 1, characterized in that: The lower mold base (5) has multiple guide pillars (16) arranged side by side between the upper cavity (20) and the lower cavity (21) on its side, and the connecting plate (14) is provided with a guide sleeve (25) that cooperates with the guide pillars (16).

5. A die-casting mold using an embedded reverse-pull core-pulling structure according to claim 1, characterized in that: The lower cavity (21) has a step (22) on both sides of the side opening, and the reverse thrust cylinder (15) is fixed on the two steps (22) by fasteners.

6. A die-casting mold using an embedded reverse-pull core-pulling structure according to claim 1, characterized in that: The inner walls on both sides of the upper cavity (20) are equipped with pressure strips (24), and the two pressure strips (24) press against the upper surfaces on both sides of the pusher seat (12). The bottom of the upper cavity (20) is provided with a track block (23) that cooperates with the pusher seat (12), and the upper surface of the track block (23) is a smooth guide surface.

7. A die-casting mold using an embedded reverse-pull core-pulling structure according to claim 1, characterized in that: The reverse thrust base (12) is provided with a cooling pipe (13), one end of which extends into the core-pulling block (11).

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