Fixed mold ejection structure

Abstract

The utility model relates to the technical field of die-casting dies, and discloses a fixed die ejection structure. Comprising a pressing plate which is fixed on a fixed mold frame and is positioned behind a fixed mold core, an ejector pin mounting plate and an ejector pin push plate which are arranged between the pressing plate and the fixed mold core, a plurality of ejector pins and return pins which can penetrate through the fixed mold core, and ejection assemblies which have the same number as the return pins and are in one-to-one correspondence with the return pins, the ejector pin mounting plate and the ejector pin push plate clamp the ejector pin and the pop-up assembly in a front-back splicing mode, and one end of the return pin is connected with the pop-up assembly. According to the fixed mold ejection structure provided by the utility model, the push force of the spring ejection assembly directly drives the return pin, so that the mode that the elastic force of a spring directly acts on the ejector pin mounting plate in a traditional structure is changed, and the ejector pin mounting plate and the ejector pin push plate are stressed and distributed more uniformly; and the problem that the ejector pin mounting plate deforms due to concentrated stress caused by opening and closing movement of a large number of molds is avoided.

Description

Technical Field

[0001] This utility model relates to the field of die-casting mold technology, and in particular to a fixed mold ejection structure. Background Technology

[0002] Die-casting molds are commonly used in the production of automotive parts. Due to the large clamping force of the casting on the fixed mold, the casting is difficult to demold. Therefore, an ejection structure is usually set on the fixed mold to assist in the demolding of the casting. In the existing fixed mold ejection structure, the spring force of the ejector component acts directly on the ejector pin mounting plate, causing the ejector pins on the ejector pin mounting plate to move towards the cavity, thereby ejecting the casting. When the die-casting mold closes, the ejector pin mounting plate is moved away from the cavity, allowing the spring of the ejector component to recharge. However, with this structure, since the ejector component acts directly on the ejector pin mounting plate, after actual production, the mold undergoes a lot of opening and closing movements, which can easily cause the ejector pin mounting plate to deform under stress, making it difficult to ensure the balance of ejector pin ejection.

[0003] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a fixed mold ejection structure, which aims to change the way in which the spring force acts directly on the ejector plate in the traditional structure, and solve the problem of force concentration and deformation of the ejector plate.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A fixed mold ejection structure includes a pressure plate fixed on a fixed mold frame and located behind a fixed mold core, an ejector pin mounting plate and an ejector pin push plate disposed between the pressure plate and the fixed mold core, multiple ejector pins and return rods that can penetrate the fixed mold core, and an ejection assembly with the same number of return rods that corresponds to each other. The ejector pin mounting plate and the ejector pin push plate clamp the ejector pins and the ejection assembly by splicing them together. One end of each return rod is connected to the ejection assembly. The ejection assembly provides a force for the ejector pin mounting plate, the ejector pin push plate, the ejector pins, and the return rods to move toward the mold cavity.

[0007] As a further improvement to the above technical solution, the pop-out assembly includes a sleeve with one end closed, a bolt, a spring, a pressure sleeve, and a limiting ring. The tail end of the bolt is threadedly connected to the limiting ring. The spring and the pressure sleeve are movably fitted onto the bolt. The head of the bolt restricts the pressure sleeve from disengaging from the bolt. The pressure sleeve can drive the spring to compress towards the limiting ring. The spring can release its elastic force to press the pressure sleeve against the pressure plate.

[0008] As a further improvement to the above technical solution, the open end of the sleeve is provided with a positioning outer ring for clamping the ejector plate and the ejector push plate, and one end of the return rod is fixed to the closed end of the sleeve by a fixing ring and screws.

[0009] As a further improvement to the above technical solution, the spring is a disc spring.

[0010] As a further improvement to the above technical solution, the plurality of ejector components and return rods are distributed at the corners of the ejector pin mounting plate.

[0011] The beneficial effects of this utility model are as follows: Compared with the prior art, the fixed mold ejection structure provided by this utility model directly drives the return rod with the thrust of the spring ejector assembly, changing the way the spring force acts directly on the ejector plate in the traditional structure. This makes the force distribution between the ejector plate and the ejector push plate more uniform, avoiding the problem of deformation caused by concentrated force on the ejector plate due to a large number of mold opening and closing movements. Because the ejector plate is not easily deformed, it can better ensure the ejection balance of multiple ejector pins during the ejection of the casting, improving the quality and stability of casting demolding. This is beneficial to improving the production accuracy and efficiency of die-cast products such as automotive parts, reducing scrap rate, extending mold service life, and reducing the increase in production costs caused by mold maintenance and component replacement. It has significant progressive significance and practical value in the field of die-casting mold technology. Attached Figure Description

[0012] Figure 1 This is a three-dimensional view of the fixed mold ejection structure.

[0013] Figure 2 This is a 3D view showing the connection between the pop-up component and the return lever.

[0014] Figure 3 This is a cross-sectional view showing the connection between the pop-up component and the return rod.

[0015] Figure 4 This is a schematic diagram showing the fit between the fixed mold ejection structure and the fixed mold core.

[0016] Figure 5 A three-dimensional view showing the pressure plate set on the fixed mold frame.

[0017] Explanation of main component symbols: 1-fixed mold frame, 2-fixed mold core, 3-pressure plate, 4-ejector mounting plate, 5-ejector push plate, 6-return rod, 7-ejector, 8-ejector assembly, 81-sleeve, 810-positioning outer ring, 82-bolt, 83-spring, 84-pressure sleeve, 85-limiting ring, 86-fixing ring. Detailed Implementation

[0018] This utility model provides a fixed mold ejection structure. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail 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 the scope of protection of this utility model.

[0019] Please see Figures 1 to 5 This utility model provides a fixed mold ejection structure, including a pressure plate 3 fixed on a fixed mold frame 1 and located behind a fixed mold core 2, an ejector pin mounting plate 4 and an ejector pin push plate 5 disposed between the pressure plate 3 and the fixed mold core 2, multiple ejector pins 7 and return rods 6 that can penetrate the fixed mold core 2, and an ejection assembly 8 that is the same number as and corresponds one-to-one with the return rods 6. The ejector pin mounting plate 4 and the ejector pin push plate 5 clamp the ejector pins 7 and the ejection assembly 8 by splicing them front and back. One end of the return rod 6 is connected to the ejection assembly 8. The ejection assembly 8 provides a force for the ejector pin mounting plate 4, the ejector pin push plate 5, the ejector pins 7 and the return rods 6 to move toward the mold cavity.

[0020] In this fixed mold ejection structure, when the casting needs to be ejected, the thrust generated by the ejector assembly 8 directly acts on the return rod 6. Since the return rod 6 is connected to the ejector assembly 8 in a one-to-one correspondence, under the force of the spring 83 of the ejector assembly 8, the return rod 6 gains the power to move towards the mold cavity. The ejector mounting plate 4 and the ejector push plate 5 clamp the ejector pin 7 and the ejector assembly 8 by splicing them together. At this time, the ejector mounting plate 4 and the ejector push plate 5 receive forces. As the return rod 6 moves, it drives the ejector mounting plate 4 and the ejector push plate 5 to move as a whole, thereby causing the ejector pin 7 to penetrate the fixed mold core 2 and move towards the mold cavity, ejecting the casting. When the die-casting mold is closed, the ejector mounting plate 4 and the ejector push plate 5 are driven away from the cavity. During this process, the spring 83 of the ejector assembly 8 re-stores energy, preparing for the next ejection of the casting.

[0021] Compared with existing technologies, the fixed mold ejection structure provided by this utility model directly drives the return rod 6 with the thrust of the spring 83 ejector assembly 8, changing the way the spring force of the spring 83 directly acts on the ejector plate 4 in the traditional structure. This makes the force distribution between the ejector plate 4 and the ejector push plate 5 more uniform, avoiding the problem of deformation of the ejector plate 4 due to concentrated force caused by a large number of mold opening and closing movements. Since the ejector plate 4 is not easily deformed, it can better ensure the ejection balance of multiple ejector pins 7 during the ejection of the casting, improving the quality and stability of casting demolding. This is beneficial to improving the production accuracy and efficiency of die-cast products such as automotive parts, reducing scrap rate, extending mold service life, and reducing the increase in production costs caused by mold maintenance and component replacement. It has significant progressive significance and practical value in the field of die-casting mold technology.

[0022] For details, see Figure 2 and Figure 3 As shown, the ejector assembly 8 includes a sleeve 81 with one end closed, a bolt 82, a spring 83, a pressure sleeve 84, and a limiting ring 85. The tail end of the bolt 82 is threadedly connected to the limiting ring 85. The spring 83 and the pressure sleeve 84 are movably fitted onto the bolt 82. The head of the bolt 82 restricts the pressure sleeve 84 from disengaging from the bolt 82. The pressure sleeve 84 can drive the spring 83 to compress towards the limiting ring 85. Since the bolt 82 and the limiting ring 85 are threadedly connected, the degree of compression of the spring 83 can be precisely adjusted by rotating the bolt 82, thereby changing the elastic force of the spring 83. The spring 83 can release its elastic force to press the pressure sleeve 84 against the pressure plate 3. When the spring 83 releases its elastic force, the pressure sleeve 84, as a force transmission medium, can stably transmit the elastic force of the spring 83 to the pressure plate 3. This force is then transmitted to the ejector pin 7 through components such as the return rod 6, the ejector pin mounting plate 4, and the ejector pin push plate 5, thereby achieving precise ejection of the casting. This force transmission path is clear and precise, which helps to ensure the smoothness and consistency of the ejection process, and further improves the demolding quality and precision of the casting.

[0023] Further details can be found here. Figure 2 As shown, the open end of the sleeve 81 is provided with a positioning outer ring 810 for clamping the ejector plate 4 and the ejector push plate 5. Specifically, the ejector plate 4 and the ejector push plate 5 have annular grooves that fit the positioning outer ring 810. The positioning outer ring 810 provides a precise clamping and positioning reference for the ejector plate 4 and the ejector push plate 5, enabling them to quickly and accurately position themselves when clamping the ejector assembly 8, ensuring the assembly accuracy of the entire ejection structure. During long-term mold operation, this precise positioning helps maintain a stable relative position between the ejector plate 4 and the ejector push plate 5 and other components, thereby ensuring the ejection position accuracy of the ejector pin 7 and the consistency of the ejection action, effectively improving the stability of the casting demolding quality. Furthermore, one end of the return rod 6 is fixed to the closed end of the sleeve 81 by a fixing ring 86 and screws, forming a stable and reliable connection. When the ejector assembly 8 is in operation, the elastic force released by the spring 83 can be efficiently transmitted to the return rod 6 through the sleeve 81, avoiding force transmission loss or deviation caused by loose connection. This reliable connection and force transmission mechanism ensures the timeliness and effectiveness of the ejection action, ensuring that the casting can be successfully demolded, and improving the working efficiency and production reliability of the mold.

[0024] Preferably, the spring 83 is a disc spring. Compared to a regular cylindrical spring 83, a disc spring can withstand a greater load within the same spatial volume. In the ejection structure of a die-casting mold, this characteristic ensures that the ejector pin 7 receives a sufficiently strong and stable thrust to overcome the large clamping force of the casting on the fixed mold, ensuring that the casting can be smoothly ejected from the mold cavity. Moreover, disc springs have good fatigue life and stability. During the numerous opening and closing cycles of the mold, disc springs can maintain the stability of their elastic characteristics and mechanical properties for a long time, and are not prone to elastic decay or failure due to frequent compression and rebound. This means that the performance of the ejection structure can remain relatively stable throughout the entire service life of the mold, reducing the probability of problems such as ejection imbalance and insufficient ejection force caused by changes in the performance of the spring 83, thereby reducing the frequency of mold maintenance and repair costs, and improving the continuity and stability of production.

[0025] In this embodiment, the plurality of ejector components 8 and return rods 6 are distributed at the corners of the ejector plate 4. This layout helps to achieve uniform force distribution on the ejector plate 4 and the ejector push plate 5. During the ejection process, the ejector components 8 distributed at the corners work together to ensure that the ejector plate 4 receives a relatively balanced thrust from all sides, avoiding excessive or insufficient local force, effectively reducing the risk of deformation of the ejector plate 4 due to uneven force distribution, thereby better ensuring the balance and consistency of the ejection of the ejector pins 7 and improving the stability of the casting demolding quality.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. A fixed mold ejection structure, characterized in that, It includes a pressure plate fixed on the fixed mold frame and located behind the fixed mold core, an ejector mounting plate and an ejector push plate disposed between the pressure plate and the fixed mold core, multiple ejector pins and return rods that can penetrate the fixed mold core, and an ejector assembly with the same number of return rods that corresponds to each other. The ejector mounting plate and the ejector push plate clamp the ejector pins and the ejector assembly by splicing them together. One end of the return rod is connected to the ejector assembly. The ejector assembly provides the ejector mounting plate, the ejector push plate, the ejector pins, and the return rods with a force that moves them toward the mold cavity.

2. The fixed mold ejection structure according to claim 1, characterized in that, The pop-out assembly includes a sleeve closed at one end, a bolt, a spring, a pressure sleeve, and a limiting ring. The tail end of the bolt is threaded to the limiting ring. The spring and the pressure sleeve are movably fitted onto the bolt. The head of the bolt restricts the pressure sleeve from disengaging from the bolt. The pressure sleeve can drive the spring to compress towards the limiting ring. The spring can release its elastic force to press the pressure sleeve against the pressure plate.

3. The fixed mold ejection structure according to claim 2, characterized in that, The open end of the sleeve is provided with a positioning outer ring for clamping the ejector plate and ejector push plate. One end of the return rod is fixed to the closed end of the sleeve by a fixing ring and screws.

4. The fixed mold ejection structure according to claim 2, characterized in that, The spring is a disc spring.

5. The fixed mold ejection structure according to any one of claims 1-4, characterized in that, The plurality of ejector components and return rods are distributed at the corners of the ejector plate.

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