Core-pulling mold structure with guiding function
The core-pulling mold structure, which uses a guide groove in the middle of the slider to cooperate with the guide post, solves the problems of slider wobble and wear, achieves stable guidance and improved accuracy in the core-pulling process, and extends the service life of the mold.
Patent Information
- Application Number
- CN202511325009.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-17
- Publication Date
- 2025-10-28
AI Technical Summary
During the existing mold core pulling process, the unreasonable guide structure causes the slider to run off-center, wear unevenly, and reduce the core pulling accuracy, affecting product quality and mold life.
The slider adopts a guide groove in the middle and a cross-type guide post, combined with the upper and lower arc-shaped backing plates and the flexible envelope guidance of the elastic element. Through the stable support of the guide seat, the center line positioning of the slider and the absorption of motion deviation are realized, thereby improving the guiding stiffness and self-adaptive capability.
It improves the smoothness and reliability of the core-pulling process, reduces slider wobble and local wear, and enhances the service life of the mold and the core-pulling accuracy.
Smart Images
Figure CN120840023A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of mold manufacturing technology, specifically to a core-pulling mold structure with guiding function. Background Technology
[0002] In manufacturing processes such as injection molding and die casting, core-pulling molds are widely used to mold plastic parts or castings with side holes, side recesses, or complex internal cavities. When demolding, the core-pulling mechanism is needed to smoothly pull the core with lateral features out of the product to ensure complete demolding. Among these, horizontal core-pulling molds are particularly common in industrial production due to their clear movement path and relatively stable structure.
[0003] In existing technologies, most horizontal core-pulling structures rely on the direct cooperation between the slider and the guide groove for guidance. Under long-term high-frequency operation, this structure is prone to uneven wear of the guide surface due to the concentration of force on the bottom or side wall of the slider. This can lead to slider swaying, jamming, or even core bending or breakage. At the same time, when the mold undergoes slight deformation due to temperature changes, traditional single-sided or bottom guidance cannot effectively compensate for positional deviations. This significantly reduces the stability and repeatability of the core-pulling action, affecting product molding quality and mold life. Summary of the Invention
[0004] The purpose of this invention is to provide a core-pulling mold structure with guiding function to solve the problems mentioned in the background art, such as slider swaying, uneven wear, and reduced core-pulling accuracy caused by unreasonable guiding structure in the current mold core-pulling process.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a core-pulling mold structure with guiding function, comprising a fixed mold base, a moving mold base, a slider, and a core-pulling rod. The slider is slidably disposed in the mounting cavity of the moving mold base, and the core-pulling rod is fixedly connected to the front end of the slider. A guide groove is provided through the middle of the slider. Guide posts are installed on both sides of the moving mold base through support blocks. The guide posts pass through the guide grooves, and the upper and lower sides of the outer periphery of the guide posts are respectively provided with radially elastic floating arc-shaped liner plates. The arc-shaped liner plates are connected to the guide seats fixed on the moving mold base through elastic elements.
[0006] Preferably, the guide groove is a rectangular through hole with a height greater than the diameter of the guide post, and the guide post is located at the geometric center of the guide groove.
[0007] Preferably, the inner arc radius of the arc-shaped liner is matched with the outer circle radius of the guide post, and the surface of the arc-shaped liner is covered with a polytetrafluoroethylene friction-reducing coating.
[0008] Preferably, one end of the elastic element abuts against the countersunk hole of the guide seat, and the other end of the elastic element abuts against the outer boss of the arc-shaped liner.
[0009] Preferably, the axial length of the arc-shaped liner is less than the effective guide section length of the guide post, and the arc-shaped liner can slide axially along the outer periphery of the guide post and float radially elastically.
[0010] Preferably, the guide seat is fixed to the moving mold base by screws, and the guide seat has an internal mounting cavity.
[0011] Preferably, the inner ends of the guide posts are provided with external threads, and the support block is provided with threaded through holes corresponding to the guide posts.
[0012] Preferably, the two ends of the arc-shaped liner are provided with rounded corners, and its envelope angle is 90°-120°.
[0013] Preferably, the bottom of the slider is provided with an auxiliary guide groove, and the moving mold base is provided with a flat key type guide rail that cooperates with the auxiliary guide groove.
[0014] Preferably, the guide post is a high-precision ground cylinder with a surface roughness Ra≤0.8μm.
[0015] Compared with existing technologies, the beneficial effects of this invention are: the core-pulling mold structure with guiding function can achieve stable guidance during the core-pulling process, effectively reducing slider sway and local wear, and improving core-pulling accuracy and mold service life. This structure achieves centerline positioning through the cooperation of the guide slot in the middle of the slider and the bridging guide post, reducing eccentric torque. Through the synergistic effect of the upper and lower arc-shaped liner plates and elastic elements, a flexible envelope guide is formed, effectively absorbing motion deviations and vibration impacts. Combined with the stable support of the guide seat, the overall structure has high guiding stiffness and strong self-adaptive capability, significantly improving the stability and reliability of the core-pulling process. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of a core-pulling mold structure with guiding function according to the present invention;
[0017] Figure 2 This is a partial structural diagram of the fixed mold base and the moving mold base of the core-pulling mold structure with guiding function according to the present invention in the mold closing state;
[0018] Figure 3 This is a schematic diagram of the connection structure between the slider and the guide post in a core-pulling mold structure with guiding function according to the present invention;
[0019] Figure 4 This is a schematic diagram of the inner end structure of the moving mold base mounting cavity of a core-pulling mold structure with guiding function according to the present invention;
[0020] Figure 5This is a schematic diagram of the outer surface structure of the arc-shaped liner plate of a core-pulling mold structure with guiding function according to the present invention.
[0021] In the diagram: 1. Fixed mold base; 2. Moving mold base; 3. Slider; 4. Core pulling rod; 5. Guide slot; 6. Guide post; 7. Support block; 8. Arc-shaped liner; 9. Elastic element; 10. Guide seat; 11. Auxiliary guide rail slot; 12. Flat key type guide rail. Detailed Implementation
[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] See also Figure 1-5This invention provides a technical solution: a core-pulling mold structure with guiding function, including a fixed mold base 1, a moving mold base 2, a slider 3, and a core-pulling rod 4. The slider 3 is slidably disposed in the mounting cavity of the moving mold base 2. The core-pulling rod 4 is fixedly connected to the front end of the slider 3. The front end of the core-pulling rod 4 is screwed into the connecting hole at the front end of the slider 3. A guide groove 5 is provided through the middle of the slider 3. Guide posts 6 are installed on both sides of the moving mold base 2 by support blocks 7. The support blocks 7 are symmetrically fixed to the inner walls of the mounting cavities on both sides of the moving mold base 2 by screws. The guide posts 6 pass through the guide groove 5, and the upper and lower sides of the outer periphery of the guide posts 6 are respectively provided with radially elastically floating arc-shaped liner plates 8. The arc-shaped liner plates 8 are connected to the guide seat 10 fixed on the moving mold base 2 by elastic elements 9. The curved surface forms an enveloping sliding contact with the outer periphery of the guide post 6. In this structure, when the slider 3 moves horizontally along the moving mold base 2 for core pulling, the guide post 6, as the central reference component, penetrates the guide slot 5 of the slider 3, undertaking the main guiding and positioning function. Simultaneously, the curved backing plates 8 on its upper and lower sides, under the preload of the elastic element 9, always maintain close contact with the outer periphery of the guide post 6, forming an enveloping support. When the slider 3 exhibits a slight tendency to wobble due to uneven force or mold thermal deformation, one side of the curved backing plate 8 is compressed and undergoes radial compression deformation through the elastic element 9, while the other side releases elastic potential energy accordingly, achieving dynamic force balance. This linkage ensures that the slider 3 always moves stably around the axis of the guide post 6, avoiding localized stress concentration caused by unilateral contact. Furthermore, due to the guide post... 6 is rigidly fixed by the support block 7, ensuring high positional accuracy. Combined with the elastic floating capability of the arc-shaped liner 8, it effectively absorbs vibrations and assembly errors during movement, significantly improving the smoothness and repeatability of the slider 3. This solves problems in existing technologies caused by concentrated force on the bottom or sidewalls of the slider 3, such as uneven wear of the guide surface, slider wobble, jamming, and even core-pulling rod breakage. It also enhances the mold's adaptability to temperature changes, improving the reliability of the core-pulling action and the overall lifespan of the mold. The guide slot 5 is a rectangular through hole with a height greater than the diameter of the guide post 6, and the guide post 6 is located at the geometric center of the guide slot 5. This structure allows the guide post 6 to act as a central reference, penetrating the guide slot 5 and effectively constraining the lateral and vertical degrees of freedom of the slider 3. To prevent twisting and offset, the height of the guide groove 5 is greater than the diameter of the guide post 6, providing the necessary space for the radial elastic floating of the arc-shaped liner 8. This ensures that the upper and lower arc-shaped liner 8 can synchronously respond to the small displacements of the slider 3, achieving dynamic balance and further improving guiding accuracy and motion stability. The inner arc radius of the arc-shaped liner 8 matches the outer radius of the guide post 6, and the surface of the arc-shaped liner 8 is covered with a polytetrafluoroethylene (PTFE) anti-friction coating. This structure allows the arc-shaped liner 8 and the guide post 6 to form a uniformly fitted sliding contact surface, reducing contact stress concentration and improving guiding stability. The PTFE anti-friction coating effectively reduces the coefficient of friction during relative movement, reducing wear and heat generation, and extending the service life of the parts. The elastic element 9 can be made of fatigue-resistant elastomer material.For example, in polyurethane or rubber composite materials, one end of the elastic element 9 abuts against the countersunk hole of the guide seat 10, and the other end of the elastic element 9 abuts against the outer boss of the arc-shaped liner 8. This structure provides a stable radial preload to the arc-shaped liner 8 through the elastic element 9, ensuring that it always maintains close contact with the guide post 6, effectively absorbing the small vibrations and sway during the movement of the slider 3, thereby improving the smoothness and repeatability of the core pulling action. The axial length of the arc-shaped liner 8 is less than the effective guide section length of the guide post 6, and the arc-shaped liner 8 can slide axially along the outer periphery of the guide post 6 and float radially elastically. This structure allows the arc-shaped liner 8 to maintain effective envelopment support for the guide post 6 while possessing axial movement capability. To prevent interference between the arc-shaped liner 8 and the end of the guide post 6 when the slider 3 has a long stroke, the guide seat 10 is fixed to the inner side wall of the mounting cavity of the moving mold base 2 by screws. The guide seat 10 has an internal mounting cavity. This structure ensures that the guide seat 10 is securely and reliably installed on the moving mold base 2, effectively bearing the lateral forces generated during the guiding process. The mounting cavity inside the guide seat 10 provides a concentrated mounting space for the arc-shaped liner 8 and the elastic element 9, realizing modular integration of the guiding components, facilitating assembly, maintenance, and replacement, while ensuring accurate positioning of each part and stable collaborative operation. The inner ends of the guide posts 6 are all provided with external threads, and the support block 7 has threaded through holes corresponding to the guide posts 6. This structure achieves a secure connection between the guide post 6 and the support block 7 through threaded engagement, ensuring stable axial position and preventing loosening. It can withstand repeated loads during the core-pulling process over a long period, while also facilitating quick disassembly and replacement of the guide post 6, which is beneficial for mold maintenance and precision adjustment. The arc-shaped liner 8 has rounded corners at both ends, and its envelope angle is 90°-120°. This structure effectively avoids stress concentration through rounded corners at both ends, improving fatigue strength during repeated elastic deformation. The reasonable envelope angle ensures sufficient contact area with the guide post 6 to enhance guiding stability. The bottom of the slider 3 is provided with an auxiliary guide groove 11, and the moving mold base 2 is also provided with a groove that connects to the auxiliary guide groove 11. The mating flat key guide rail 12 is fixed to the moving mold base 2 with screws. Its top surface is slightly lower than the guide plane of the moving mold base 2 to avoid forming a three-sided constraint with the bottom of the slider 3. This structure provides auxiliary guidance and positioning for the slider 3 during the initial core-pulling stage, effectively preventing it from tilting or wobbling at startup and ensuring a smooth transition of the motion trajectory. The guide post 6 is a high-precision ground cylinder with a surface roughness Ra≤0.8μm. This structure ensures the cylindricity and dimensional consistency of the guide post 6, making it uniformly contacted and with controllable gaps when mating with the guide slot 5 and the arc-shaped liner 8, effectively reducing motion resistance and ensuring the stability and repeatability of the core-pulling action under long-term high-frequency operation.
[0024] Working principle: When using this core-pulling mold structure with guiding function, after the mold opens, the power unit drives the slider 3 to move horizontally along the moving mold base 2. The core-pulling rod 4 moves forward synchronously with the slider 3 and enters the mold cavity for forming. After the mold closes, the core-pulling action is initiated. The slider 3 moves backward along the core-pulling direction under the drive mechanism. At this time, the guide post 6 remains fixed and passes through the guide slot 5 of the slider 3. During the movement of the slider 3, the arc-shaped liner plates 8 on its upper and lower sides are always in contact with the outer periphery of the guide post 6. The elastic element 9 applies a pre-tightening force through the guide seat 10 to make the arc-shaped liner plates 8 fit against the guide post 6. When the slider 3 passes through the initial stroke, the auxiliary guide at the bottom... The rail groove 11 slides along the keyed guide rail 12 to provide initial guidance. As the slider 3 continues to move backward, the center of the guide post 6 and the guide through groove 5 become the main guide path. When the slider 3 deviates slightly, the arc-shaped liner 8 generates radial elastic deformation, compressing the elastic element 9 on one side and releasing elastic potential energy on the other side. At the same time, the arc-shaped liner 8 slides along the axial direction of the guide post 6 to adapt to the position change throughout the process. The guide post 6 is fixed by connecting the threaded through holes on the support block 7 with the external threads at both ends. During the entire core pulling process, the slider 3 moves backward steadily around the axis of the guide post 6 until the core pulling rod 4 completely disengages from the product hole, completing the core pulling action and thus completing a series of tasks.
[0025] Although the present invention 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 the present invention should be included within the protection scope of the present invention.
Claims
1. A core-pulling mold structure with guiding function, comprising a fixed mold base (1), a moving mold base (2), a slider (3), and a core-pulling rod (4), characterized in that: The slider (3) is slidably disposed in the mounting cavity of the moving mold base (2). The core-pulling rod (4) is fixedly connected to the front end of the slider (3). A guide groove (5) is provided through the middle of the slider (3). Guide posts (6) are installed on both sides of the moving mold base (2) through support blocks (7). The guide posts (6) are inserted into the guide groove (5). The upper and lower sides of the outer periphery of the guide posts (6) are respectively provided with radially elastic floating arc-shaped liner plates (8). The arc-shaped liner plates (8) are connected to the guide seat (10) fixed on the moving mold base (2) through elastic elements (9).
2. The core-pulling mold structure with guiding function according to claim 1, characterized in that: The guide groove (5) is a rectangular through hole with a height greater than the diameter of the guide post (6), and the guide post (6) is located at the geometric center of the guide groove (5).
3. The core-pulling mold structure with guiding function according to claim 1, characterized in that: The inner arc radius of the arc-shaped liner (8) matches the outer circle radius of the guide post (6), and the surface of the arc-shaped liner (8) is covered with a polytetrafluoroethylene anti-friction coating.
4. The core-pulling mold structure with guiding function according to claim 1, characterized in that: One end of the elastic element (9) abuts against the countersunk hole of the guide seat (10), and the other end of the elastic element (9) abuts against the outer boss of the arc-shaped liner (8).
5. The core-pulling mold structure with guiding function according to claim 1, characterized in that: The axial length of the arc-shaped liner (8) is less than the effective guide section length of the guide post (6), and the arc-shaped liner (8) can slide axially along the outer periphery of the guide post (6) and float radially elastically.
6. The core-pulling mold structure with guiding function according to claim 1, characterized in that: The guide seat (10) is fixed to the moving mold seat (2) by screws, and the guide seat (10) has an installation cavity inside.
7. The core-pulling mold structure with guiding function according to claim 1, characterized in that: The inner end of each guide post (6) is provided with an external thread, and the support block (7) is provided with a threaded through hole corresponding to the guide post (6).
8. The core-pulling mold structure with guiding function according to claim 1, characterized in that: The arc-shaped liner (8) has rounded corners at both ends, and its envelope angle is 90°-120°.
9. A core-pulling mold structure with guiding function according to claim 1, characterized in that: The bottom of the slider (3) is provided with an auxiliary guide groove (11), and the moving mold base (2) is provided with a flat key type guide rail (12) that cooperates with the auxiliary guide groove (11).
10. A core-pulling mold structure with guiding function according to claim 1, characterized in that: The guide post (6) is a high-precision ground cylinder with a surface roughness Ra≤0.8μm.