A shell die-casting mold

Abstract

The utility model provides a kind of shell die casting die, including bottom plate, the bottom plate upper side four corners are all fixedly connected with limiting post, the upper end of multiple limiting posts is slidably matched with a top plate, the upper side center of bottom plate is equipped with lower mould, the downside of top plate is equipped with the upper mould matched with lower mould, the upper side of lower mould is equipped with die core, the downside of upper mould is equipped with the die cavity matched with die core, the inside of lower mould is equipped with installation cavity. By setting the collaborative stripping structure that pusher plate preferentially pushes and ejector pin subsequently assists, because the inclination angle of pusher plate correlation guide structure is larger, force is applied from the periphery of shell during stripping, the gap between shell and die core is formed quickly, then ejector pin cooperates with conical push block to apply force from the bottom, stripping is smoothly completed by the gap, which avoids the sidewall injury caused by ejector pin alone, reduces the bottom contact pressure, eliminates indentation or thin-wall rupture, and guarantees the appearance and structural strength of shell.

Description

Technical Field

[0001] This utility model relates to the field of shell die casting processing technology, specifically a shell die casting mold. Background Technology

[0002] In the automotive and home appliance manufacturing industries, housing-type parts (such as motor housings and controller housings) are widely produced using die casting technology. The corresponding housing die casting mold is the core equipment for achieving efficient molding. Currently, most housing die casting molds on the market use a single ejector pin as the core of the demolding mechanism. After the housing is die-cast, the ejector pin pushes the bottom of the housing upwards to separate the housing from the cavity. This structure is widely used in the production of small and medium-sized housing die castings due to its simple design and low manufacturing cost.

[0003] However, existing demolding methods relying on individual ejector pins are problematic for shells with deep cavities. The concentrated force applied by the ejector pins and the single demolding path make it difficult to demold the shell from the cavity. Forced pushing can easily cause damage to the side walls of the shell. Furthermore, the small contact area between the ejector pin and the bottom of the shell results in excessive local pressure during pushing, which can leave ejector pin marks on the bottom of the shell and even cause cracks in the thin-walled area at the bottom. This affects the appearance quality and structural strength of the shell, requiring additional repair processes and increasing production costs. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a shell die-casting mold to solve the problems mentioned in the background art. This utility model has a novel structure. By setting a cooperative demolding structure with a push plate for priority pushing and ejector pins for subsequent assistance, the push plate and the associated guide structure have a large inclination angle. During demolding, force is first applied from the periphery of the shell to quickly create a gap between the shell and the mold core. Then, the ejector pins and the conical push block apply force from the bottom, and the demolding is smooth with the help of the gap. This avoids side wall damage caused by a single ejector pin, reduces bottom contact pressure, eliminates indentations or thin-wall cracks, and ensures the appearance and structural strength of the shell.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a die-casting mold for a housing, comprising a base plate, with limiting posts fixedly connected to the four corners of the upper side of the base plate, a top plate slidably fitted at the upper ends of the multiple limiting posts, a lower mold mounted at the center of the upper side of the base plate, an upper mold fitted to the lower mold mounted on the lower side of the top plate, a mold core mounted on the upper side of the lower mold, a mold cavity fitted to the mold core on the lower side of the upper mold, an installation cavity inside the lower mold, a cylindrical groove shared by the lower mold and the mold core on opposite sides, an ejector pin slidably fitted to the inner wall of the cylindrical groove, a limiting ring block fixedly connected to the ejector pin at a position inside the cylindrical groove, a spring sleeved on the outer side of the ejector pin, and a demolding mechanism provided inside the installation cavity.

[0006] Furthermore, the two ends of the spring abut against the upper side of the inner wall of the cylindrical groove and the upper side of the limiting ring block, respectively, and the upper and lower ends of the ejector pin extend to the upper side of the mold core and the interior of the mounting cavity, respectively.

[0007] Furthermore, the demolding mechanism includes a cylinder installed on one side of the lower mold. A trapezoidal top block is fixedly connected to the output end of the cylinder. A limiting groove is formed on the upper side of the trapezoidal top block. An L-shaped guide groove is formed on both sides of the trapezoidal top block. A guide rod is slidably fitted on the inner wall of the L-shaped guide groove. A strip plate is fixedly connected to both ends of the guide rod. Two connecting rods are fixedly connected to the upper side of the strip plate. The upper ends of the multiple connecting rods extend to the upper side of the lower mold and are fixedly connected to a push plate. A receiving groove that cooperates with the push plate is formed on the upper side of the lower mold.

[0008] Furthermore, the lower end of the ejector pin slides into the inner wall of the limiting groove, and multiple connecting rods are fixedly connected to the four corners of the push plate. The inclination angle of the L-shaped guide groove is greater than the inclination angle of the limiting groove.

[0009] Furthermore, a dovetail groove is provided on the lower side of the inner wall of the mounting cavity, and a dovetail block that slides in the inner wall of the dovetail groove is fixedly connected to the lower side of the trapezoidal top block. A mating groove that matches the mold core is provided on the lower side of the push plate.

[0010] Furthermore, trapezoidal guide blocks are fixedly connected to the four corners of the upper side of the lower mold, and multiple trapezoidal guide grooves that cooperate with the trapezoidal guide blocks are opened on the lower side of the upper mold.

[0011] Furthermore, a conical push block is fixedly connected to the upper end of the ejector pin, and the top of the conical push block is located on the same horizontal plane as the top of the mold core.

[0012] The beneficial effects of this utility model are:

[0013] 1. This utility model adopts a collaborative demolding structure with a push plate for priority pushing and ejector pins for subsequent assistance. Because the push plate and the associated guide structure have a large tilt angle, force is first applied from the periphery of the shell during demolding, which quickly creates a gap between the shell and the mold core. Then, the ejector pins and the conical push block apply force from the bottom, and the shell is demolded smoothly with the help of the gap. This avoids side wall damage caused by a single ejector pin, reduces bottom contact pressure, eliminates indentations or thin-wall cracks, and ensures the appearance and structural strength of the shell.

[0014] 2. This utility model improves the mold closing accuracy and stability by setting a positioning structure of trapezoidal guide block and trapezoidal guide groove. When the mold is closed, the trapezoidal guide block and guide groove slide precisely and cooperate to guide the upper mold and the lower mold to quickly align, avoiding cavity deviation caused by mold closing misalignment, thereby reducing the problem of shell size deviation. At the same time, the movement of the top plate is restricted by the limit post to prevent the upper and lower molds from colliding and being damaged, extending the service life of the mold and indirectly reducing production and maintenance costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a die-casting mold for a housing according to the present invention;

[0016] Figure 2 This is a schematic diagram of the upper mold separation structure of a die-casting mold for a shell according to the present invention;

[0017] Figure 3 This is a schematic diagram of the lower mold cross-sectional structure of a die-casting mold for a shell according to the present invention;

[0018] Figure 4 This is a schematic diagram of the ejector pin mounting structure of a die-casting mold for a housing according to the present invention;

[0019] Figure 5 This is a schematic diagram of the demolding mechanism of a die-casting mold for a housing according to the present invention;

[0020] Figure 6 This is a schematic diagram of the cross-sectional structure of the trapezoidal top block of a die-casting mold for a shell according to the present invention.

[0021] In the diagram: 1. Base plate; 2. Limiting pin; 3. Top plate; 4. Lower mold; 5. Upper mold; 6. Mold core; 7. Mold cavity; 8. Mounting cavity; 9. Cylindrical groove; 10. Ejector pin; 11. Limiting ring block; 12. Spring; 13. Demolding mechanism; 131. Cylinder; 132. Trapezoidal ejector block; 133. Limiting inclined groove; 134. L-shaped guide groove; 135. Guide rod; 136. Strip plate; 137. Connecting rod; 138. Push plate; 139. Storage groove; 14. Dovetail groove; 15. Dovetail block; 16. Mating groove; 17. Trapezoidal guide block; 18. Trapezoidal guide groove; 19. Conical push block. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Please refer to Figures 1 to 6This utility model provides a technical solution: a shell die-casting mold, including a base plate 1, with limit posts 2 fixedly connected at the four corners of the upper side of the base plate 1, a top plate 3 slidably fitted at the upper ends of the multiple limit posts 2, a lower mold 4 installed at the center of the upper side of the base plate 1, an upper mold 5 fitted with the lower mold 4 installed on the lower side of the top plate 3, a mold core 6 installed on the upper side of the lower mold 4, a mold cavity 7 fitted with the mold core 6 opened on the lower side of the upper mold 5, an installation cavity 8 opened inside the lower mold 4, a cylindrical groove 9 opened on the opposite side of the lower mold 4 and the mold core 6, an ejector pin 10 slidably fitted on the inner wall of the cylindrical groove 9, a limit ring block 11 fixedly connected to the ejector pin 10 at a position inside the cylindrical groove 9, a spring 12 sleeved on the outer side of the ejector pin 10, and a demolding mechanism 13 provided inside the installation cavity 8. The two ends of the spring 12 abut against the upper side of the inner wall of the cylindrical groove 9 and the upper side of the limiting ring block 11, respectively. The upper and lower ends of the ejector pin 10 extend to the upper side of the mold core 6 and the interior of the mounting cavity 8, respectively. Trapezoidal guide blocks 17 are fixedly connected to the four corners of the upper side of the lower mold 4, and multiple trapezoidal guide grooves 18 that cooperate with the trapezoidal guide blocks 17 are opened on the lower side of the upper mold 5. A conical push block 19 is fixedly connected to the upper end of the ejector pin 10, and the top of the conical push block 19 is on the same horizontal plane as the top of the mold core 6. When the mold is closed, the top plate 3 slides down along the limiting post 2 of the bottom plate 1, which drives the upper mold 5 to move down. The trapezoidal guide block 17 of the lower mold 4 cooperates with the trapezoidal guide groove 18 of the upper mold 5 to guide the mold cavity 7 of the upper mold 5 to form the die-casting cavity with the mold core 6. The conical push block 19 of the ejector pin 10 is flush with the mold core 6 to avoid interference with the forming. The spring 12 abuts against the cylindrical groove 9 and the limiting ring block 11 to limit the ejector pin 10. During die casting, the molten metal is injected into the cavity and solidifies. The limiting post 2 and the trapezoidal guide block 17 ensure the stability of the structure and ensure the accuracy of the shell.

[0024] In this embodiment, the demolding mechanism 13 includes a cylinder 131 installed on one side of the lower mold 4. A trapezoidal top block 132 is fixedly connected to the output end of the cylinder 131. A limiting groove 133 is opened on the upper side of the trapezoidal top block 132. An L-shaped guide groove 134 is opened on both sides of the trapezoidal top block 132. A guide rod 135 is slidably fitted on the inner wall of the L-shaped guide groove 134. A strip plate 136 is fixedly connected to both ends of the guide rod 135. Two connecting rods 137 are fixedly connected to the upper side of the strip plate 136. The upper ends of the multiple connecting rods 137 extend to the upper side of the lower mold 4 and are fixedly connected to a push plate 138. A receiving groove 139 that cooperates with the push plate 138 is opened on the upper side of the lower mold 4. The lower end of the ejector pin 10 slides into the inner wall of the limiting groove 133. Multiple connecting rods 137 are fixedly connected to the four corners of the push plate 138. The inclination angle of the L-shaped guide groove 134 is greater than that of the limiting groove 133. A dovetail groove 14 is provided on the lower side of the inner wall of the mounting cavity 8. A dovetail block 15 that slides into the inner wall of the dovetail groove 14 is fixedly connected to the lower side of the trapezoidal top block 132. A mating groove 16 that matches the mold core 6 is provided on the lower side of the push plate 138. The cylinder 131 installed on one side of the lower mold 4 is activated. The output end of the cylinder 131 pushes the trapezoidal top block 132 to move horizontally along the dovetail groove 14 on the lower side of the inner wall of the mounting cavity 8. The cooperation between the dovetail groove 14 and the dovetail block 15 ensures the stable movement of the trapezoidal top block 132 and avoids jamming during demolding. During the process, the lower end of the ejector pin 10 slides along the inner wall of the limiting inclined groove 133 on the upper side of the trapezoidal top block 132. With the help of the inclined structure of the limiting inclined groove 133, the horizontal movement of the trapezoidal top block 132 is converted into the vertical upward movement of the ejector pin 10. The ejector pin 10 drives the limiting ring block 11 to compress the spring 12. At the same time, the tapered push block 19 at the upper end of the ejector pin 10 pushes the bottom of the housing upward. Meanwhile, when the trapezoidal top block 132 moves, its two L-shaped guides The inner wall of the groove 134 slides with the guide rod 135 (the inclination angle of the L-shaped guide groove 134 is greater than that of the limiting inclined groove 133, ensuring that the rising speed of the guide rod 135 is slightly greater than that of the ejector pin 10), so that the guide rod 135 drives the strip plates 136 at both ends to rise vertically. The strip plates 136 push the push plate 138 through the connecting rod 137 on the upper side to extend from the receiving groove 139 on the upper side of the lower mold 4. The mating groove 16 on the lower side of the push plate 138 avoids the mold core 6 to avoid interference. Finally, the push plate 138 first lifts the periphery of the shell, so that a gap is created between the shell and the mold core 6. Then, the conical push block 19 works together to demold the shell. Force is applied from the bottom and side of the shell to make the shell smoothly detach from the mold core 6, improving the smoothness of demolding.

[0025] When using the device, during the mold closing stage, the top plate 3 slides down along the limiting post 2, the trapezoidal guide block 17 and the trapezoidal guide groove 18 are positioned, the mold core 6 is embedded in the mold cavity 7, the ejector pin 10 is flush with the mold core 6, the molten metal is injected into the cavity and solidifies into a shell, during demolding, the cylinder 131 drives the trapezoidal top block 132, the ejector pin 10 moves up and the push plate 138 extends to cooperate in demolding, finally the cylinder 131 resets, the spring 12 drives the ejector pin 10 to fall back, the push plate 138 retracts into the storage groove 139, the top plate 3 moves up to open the mold, and the cycle is completed.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A die-casting mold for a housing, comprising a base plate (1), characterized in that: Limiting posts (2) are fixedly connected to the four corners of the upper side of the base plate (1). A top plate (3) is slidably fitted to the upper end of the multiple limiting posts (2). A lower mold (4) is installed at the center of the upper side of the base plate (1). An upper mold (5) that cooperates with the lower mold (4) is installed on the lower side of the top plate (3). A mold core (6) is installed on the upper side of the lower mold (4). A mold cavity (7) that cooperates with the mold core (6) is opened on the lower side of the upper mold (5). An installation cavity (8) is opened inside the lower mold (4). A cylindrical groove (9) is opened on the opposite side of the lower mold (4) and the mold core (6). An ejector pin (10) is slidably fitted to the inner wall of the cylindrical groove (9). A limiting ring block (11) is fixedly connected to the ejector pin (10) at the position inside the cylindrical groove (9). A spring (12) is sleeved on the outer side of the ejector pin (10). A demolding mechanism (13) is provided inside the installation cavity (8).

2. The die-casting mold for a housing according to claim 1, characterized in that: The two ends of the spring (12) abut against the upper side of the inner wall of the cylindrical groove (9) and the upper side of the limiting ring block (11), respectively. The upper and lower ends of the ejector pin (10) extend to the upper side of the mold core (6) and the interior of the mounting cavity (8), respectively.

3. The die-casting mold for a housing according to claim 1, characterized in that: The demolding mechanism (13) includes a cylinder (131) installed on one side of the lower mold (4). The output end of the cylinder (131) is fixedly connected to a trapezoidal top block (132). A limiting groove (133) is opened on the upper side of the trapezoidal top block (132). An L-shaped guide groove (134) is opened on both sides of the trapezoidal top block (132). A guide rod (135) is slidably fitted on the inner wall of the L-shaped guide groove (134). A strip plate (136) is fixedly connected to both ends of the guide rod (135). Two connecting rods (137) are fixedly connected to the upper side of the strip plate (136). The upper ends of the multiple connecting rods (137) extend to the upper side of the lower mold (4) and are fixedly connected to a push plate (138). A receiving groove (139) that cooperates with the push plate (138) is opened on the upper side of the lower mold (4).

4. A die-casting mold for a housing according to claim 3, characterized in that: The lower end of the ejector pin (10) is slidably fitted on the inner wall of the limiting groove (133), and multiple connecting rods (137) are fixedly connected to the four corners of the push plate (138). The inclination angle of the L-shaped guide groove (134) is greater than the inclination angle of the limiting groove (133).

5. A die-casting mold for a housing according to claim 3, characterized in that: The lower side of the inner wall of the mounting cavity (8) is provided with a dovetail groove (14), and the lower side of the trapezoidal top block (132) is fixedly connected with a dovetail block (15) that slides in the inner wall of the dovetail groove (14). The lower side of the push plate (138) is provided with a mating groove (16) that is compatible with the mold core (6).

6. A die-casting mold for a housing according to claim 1, characterized in that: The lower mold (4) has trapezoidal guide blocks (17) fixedly connected at the four corners of its upper side, and the upper mold (5) has multiple trapezoidal guide grooves (18) that cooperate with the trapezoidal guide blocks (17) on its lower side.

7. A die-casting mold for a housing according to claim 1, characterized in that: The upper end of the ejector pin (10) is fixedly connected to a conical push block (19), and the top of the conical push block (19) and the top of the mold core (6) are located on the same horizontal plane.

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