A slider core-pulling structure of a mold
By designing the helical teeth of the insert rod and the slider to mesh in the core-pulling structure of the mold slider, and the sliding groove and mounting hole of the guide slide seat to match, the problems of poor mold opening accuracy and uneven force on the inclined guide pillar for products with high undercut values are solved, and a high-precision and stable core-pulling process is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG SAIHAO IND CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-06-09
AI Technical Summary
In existing injection molds, when the undercut value is large, the inclined guide post is subjected to a large bending force and is prone to breakage. Furthermore, the increased length of the inclined guide post leads to insertion damage and iron powder shedding, affecting the service life of the mold. At the same time, the meshing clearance of the slider core-pulling structure affects the mold opening accuracy.
The design employs a slider core-pulling structure with a helical tooth groove design that engages the insert rod and the slider. Combined with the groove and mounting hole on the guide slide, this ensures a close fit between the slider and the insert rod. The engagement gap is reduced through the cooperation of the guide slide and the limiting fixing block, and the helical teeth on the insert rod are set to distribute the force evenly and enhance stability.
It improves the accuracy and stability of the slider core pulling process, reduces the meshing gap, enhances the rigidity and locking effect of the insert rod, and improves the service life and mold opening accuracy of the mold.
Smart Images
Figure CN224334917U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mold technology and relates to a slider core-pulling structure for a mold. Background Technology
[0002] In injection molding, if the product has a large undercut value, designing the inclined guide post with a large tilt angle to the vertical direction will result in a smaller core-pulling force. This leads to a large bending force on the inclined guide post, poor stress condition, and a tendency to bend and break. If the tilt angle of the inclined guide post is reduced, the mold opening force and stress condition of the inclined guide post can be improved. However, a smaller angle will lead to an increase in the length of the inclined guide post. When the inclined guide post is too long, it will have too much contact with the hole on the slider, resulting in damage to the inclined guide post, shedding of iron powder, etc., which will reduce the service life of the mold.
[0003] To address the aforementioned issues, people have developed a slider core-pulling structure for molds. For example, Chinese patent application [Authorization Announcement No.: CN201371556Y] discloses a slider core-pulling mechanism for injection molds, including a slider seat and a shovel. The shovel is fixedly connected to a rack, which is vertically arranged on one side of the slider seat. The side of the slider seat is provided with helical teeth, and the rack is provided with helical tooth grooves that match the helical teeth. The helical teeth and the helical tooth grooves are slidably connected. The core-pulling structure also includes a guide block, in which a through hole corresponding to the rack is opened. The rack passes through the through hole and is slidably connected to the guide block.
[0004] The above structure has helical teeth on the side of the slide seat and helical tooth grooves matching the helical teeth on the rack. At this time, the rack is located on one side of the helical teeth, which causes the rack to move upward relative to the helical tooth groove during mold opening, causing the helical teeth on the side of the slide seat to move horizontally. However, since the rack and the slide seat only move through the helical teeth, there will be a meshing gap during sliding. The accuracy of mold opening will be affected by the meshing gap due to the cooperation between the helical teeth and the helical tooth groove. Utility Model Content
[0005] The purpose of this utility model is to address the aforementioned problems in existing technologies by proposing a slider core-pulling structure for molds. The technical problem this utility model aims to solve is: how to address the issue of poor mold opening accuracy of existing slider core-pulling structures for products with high undercut values during demolding.
[0006] The objective of this utility model can be achieved through the following technical solutions:
[0007] A slider core-pulling structure for a mold, the mold including a fixed module and a moving module, the slider core-pulling structure including a slider and an insert rod positioned on the fixed module along the mold opening direction, the insert rod having a helical tooth on one side, and the slider having a helical tooth groove on the outer side wall that meshes with the helical tooth, the slider core-pulling structure is characterized by including a guide slide fixed to the moving module, the guide slide having a groove and a mounting hole that are both elongated, the groove and the mounting hole being perpendicular to each other, the other side of the insert rod being fixed to the fixed module, the slider having a convex cross-section along the mold opening direction, the slider being slidably connected in the groove and the outer side wall of the slider being in contact with the groove wall, the insert rod being slidably connected in the mounting hole and one side of the insert rod meshing with the slider at the connection between the groove and the mounting hole, the other side wall of the insert rod being in contact with the hole wall of the mounting hole.
[0008] During mold opening, the insert rod is positioned with the fixed module, and the insert rod will not shift. The helical teeth on the insert rod mesh with the helical tooth groove of the slider, causing relative displacement between the insert rod and the guide slide, resulting in relative sliding between the insert rod and the mounting hole. As the moving module moves, the slider and insert rod engage and slide, allowing the slider to move along the slide groove, achieving core pulling. By positioning the insert rod on the fixed module along the mold opening direction, the driving force can be directly applied to the insert rod, resulting in a short and direct force transmission path. During the core pulling process, a guide slide is added, with a slide groove and mounting hole on it. The slider and insert rod are slidably connected in the slide groove and mounting hole, respectively. During engagement, to reduce the engagement gap between the slider and the insert rod, the outer wall of the slider is fitted against the groove wall, and the outer wall of the insert rod is fitted against the side wall of the mounting hole. To ensure stable sliding along the groove when the slider and the insert rod are engaged, the cross-section of the slider along the mold opening direction is convex, which limits the slider circumferentially during the sliding process and prevents circumferential displacement. This reduces the engagement gap between the slider and the insert rod. Furthermore, to balance the force on the insert rod, a helical tooth is provided on one side of the insert rod, while the other side is fixed to the fixed module, making the force on both sides of the insert rod uniform and improving the stability of the insert rod.
[0009] In the above-mentioned slider core-pulling structure of the mold, a limiting block is fixed on the fixed module, the outer wall of the insert rod is recessed inward to form a limiting groove, and the limiting block is partially embedded in the limiting groove.
[0010] By setting the limiting and fixing block, the circumferential limit of the insert rod is realized, thereby preventing the insert rod from rotating circumferentially during mold opening and further improving the mold opening accuracy.
[0011] In the above-mentioned slider core-pulling structure of the mold, there is a gap between the limiting fixing block and the guide slide.
[0012] Furthermore, the gap setting ensures that the guide slide does not come into contact with the limit block when it moves with the moving module, thus avoiding friction, making mold opening smoother, and ensuring the accuracy of mold opening and core pulling.
[0013] In the above-mentioned slider core-pulling structure of the mold, the insert rod is cylindrical, the lower end face of the insert rod is an annular inclined surface, the moving module has a plug groove, the lower end of the insert rod is embedded in the plug groove and the lower end face is in contact with the groove wall of the plug groove.
[0014] The design of the lower end face of the insert rod allows it to be positioned when inserted into the insertion slot of the moving module, enhancing the rigidity of the insert rod and improving the locking effect on the slider during injection molding.
[0015] In the above-mentioned slider core-pulling structure of the mold, the guide slide is provided with an elastic positioning element, and two positioning grooves are opened on the outer side wall of the slider. When the mold is closed, the end of the elastic positioning element is embedded in one of the positioning grooves, and after the mold is opened, the end of the elastic positioning element is embedded in the other positioning groove.
[0016] The combination of elastic positioning components and positioning grooves serves two purposes: firstly, it prevents the slider from sliding along the groove during mold closing, thus improving the stability of the slider during mold closing; secondly, it prevents the slider from having an excessive sliding stroke during mold opening, allowing for faster secondary mold closing and further improving the stability of the slider.
[0017] In the above-mentioned slider core-pulling structure of the mold, the elastic positioning components are a positioning spring and a ball. One end of the positioning spring is connected to the guide slide, and the other end is connected to the ball. The ball can be embedded in the positioning groove.
[0018] The design of the ball bearings reduces friction in the positioning groove and allows them to be quickly squeezed under the meshing force of the slider and the insert during mold opening or closing, facilitating the sliding of the slider and reducing friction between the slider and the insert, thus ensuring smooth sliding of the slider.
[0019] Compared with existing technologies, the slider core-pulling structure of this mold has the following advantages:
[0020] 1. When producing products with high undercut values, the insert rod is positioned on the fixed module along the mold opening direction, allowing the driving force to act directly on the insert rod. The force transmission path is short and direct. To ensure the meshing accuracy between the insert rod and the slider, a guide slide is added. The guide slide has a groove and a mounting hole. The slider and the insert rod are slidably connected in the groove and mounting hole, respectively. When the slider and the insert rod are meshing, to reduce the meshing gap between them, the outer wall of the slider is fitted with the groove wall, and the outer wall of the insert rod is fitted with the side wall of the mounting hole. By making the cross-section of the slider along the mold opening direction convex, the slider is circumferentially limited during the sliding process, preventing circumferential displacement, thereby reducing the meshing gap between the slider and the insert rod.
[0021] 2. The design of the lower end face of the insert rod enables it to be positioned when inserted into the insertion slot of the moving module, enhancing the rigidity of the insert rod and improving the locking effect on the slider during injection molding. Attached Figure Description
[0022] Figure 1 This is a top view of the mold.
[0023] Figure 2 yes Figure 1 Sectional view along the middle AA.
[0024] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.
[0025] Figure 4 This is a partial assembly drawing of the slider core-pulling structure of this mold.
[0026] Figure 5 This is an exploded view of the slider core-pulling structure of this mold.
[0027] Figure 6 This is a side view of the mold.
[0028] Figure 7 yes Figure 6 A partial sectional view along the middle BB.
[0029] In the diagram, 1 is the fixed module; 11 is the limiting block; 2 is the moving module; 21 is the insertion slot; 3 is the slider; 31 is the helical tooth groove; 32 is the positioning groove; 4 is the insertion rod; 41 is the helical tooth; 42 is the limiting groove; 5 is the guide slide; 51 is the slide groove; 52 is the mounting hole; 6 is the interval; 7 is the elastic positioning element; 71 is the positioning spring; and 72 is the ball. Detailed Implementation
[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0031] like Figure 1 and Figure 3 As shown, the slider core-pulling structure of this mold includes a fixed module 1 and a moving module 2. The slider core-pulling structure includes a slider 3 and an insert rod 4 positioned on the fixed module 1 along the mold opening direction. A helical tooth 41 is provided on one side of the insert rod 4, and a helical tooth groove 31 that meshes with the helical tooth 41 is provided on the outer side wall of the slider 3.
[0032] Specifically, such as Figure 3-5 As shown, this slider core-pulling structure includes a guide slide 5 fixedly connected to the moving module 2. The guide slide 5 has a long, narrow groove 51 and a mounting hole 52. The groove 51 and the mounting hole 52 are perpendicular to each other. The other side of the insert rod 4 is fixedly connected to the fixed module 1. The slider 3 has a convex cross-section along the mold opening direction. The slider 3 is slidably connected in the groove 51 and the outer side wall of the slider 3 is in contact with the groove wall of the groove 51. The insert rod 4 is slidably connected in the mounting hole 52 and one side of the insert rod 4 engages with the slider 3 at the connection between the groove 51 and the mounting hole 52. The other side wall of the insert rod 4 is in contact with the hole wall of the mounting hole 52.
[0033] During mold opening, the insert rod 4 is positioned with the fixed module 1, and the insert rod 4 will not shift. The helical teeth 41 on the insert rod 4 mesh with the helical tooth groove 31 of the slider 3, causing relative displacement between the insert rod 4 and the guide slide 5. This allows the insert rod 4 to slide relative to the mounting hole 52. As the moving module 2 moves, the slider 3 engages with the insert rod 4 and slides, allowing the slider 3 to move along the slide groove 51, thus achieving core pulling. By positioning the insert rod 4 on the fixed module 1 along the mold opening direction, the driving force can be directly applied to the insert rod 4, resulting in a short and direct force transmission path. During the core pulling process, the guide slide 5 is added, with a slide groove 51 and a mounting hole 52 provided on it. The slider 3 and the insert rod 4 are slidably connected within the slide groove 51 and the mounting hole 52, respectively. When the slider 3 and the insert rod 4 are engaged, in order to reduce the engagement gap between the slider 3 and the insert rod 4, the outer wall of the slider 3 is fitted with the groove wall of the slide groove 51, and the outer wall of the insert rod 4 is fitted with the side wall of the mounting hole 52. In order to ensure that the slider 3 and the insert rod 4 can slide stably along the slide groove 51 when engaged, the cross section of the slider 3 along the mold opening direction is convex, which realizes the circumferential limit of the slider 3 during the sliding process and avoids circumferential displacement, thereby reducing the engagement gap between the slider 3 and the insert rod 4. In order to balance the force on the insert rod 4, a helical tooth 41 is provided on one side of the insert rod 4, while the other side is fixed to the fixed module 1, so that the force on both sides of the insert rod 4 is uniform and the stability of the insert rod 4 is improved.
[0034] like Figure 2 and Figure 3As shown, the insertion rod 4 is cylindrical, and the lower end face of the insertion rod 4 is an annular inclined surface. The moving module 2 has a insertion groove 21, and the lower end of the insertion rod 4 is embedded in the insertion groove 21 and the lower end face is in contact with the groove wall of the insertion groove 21.
[0035] like Figure 7 As shown, the guide slide 5 is provided with an elastic positioning element 7, and two positioning grooves 32 are opened on the outer side wall of the slider 3. When the mold is closed, the end of the elastic positioning element 7 is embedded in one of the positioning grooves 32. After the mold is opened, the end of the elastic positioning element 7 is embedded in the other positioning groove 32. The elastic positioning element 7 consists of a positioning spring 71 and a ball 72. One end of the positioning spring 71 is connected to the guide slide 5, and the other end is connected to the ball 72. The ball 72 can be embedded in the positioning groove 32.
[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
Claims
1. A slider core-pulling structure for a mold, the mold comprising a fixed module (1) and a moving module (2), the slider core-pulling structure comprising a slider (3) and an insert rod (4) positioned on the fixed module (1) along the mold opening direction, wherein a helical tooth (41) is provided on one side of the insert rod (4), and a helical tooth groove (31) engaging with the helical tooth (41) is provided on the outer side wall of the slider (3), characterized in that, This slider core-pulling structure includes a guide slide seat (5) fixedly connected to the moving module (2). The guide slide seat (5) has a long strip-shaped slide groove (51) and a mounting hole (52) inside. The slide groove (51) and the mounting hole (52) are arranged perpendicular to each other. The other side of the insert rod (4) is fixedly connected to the fixed module (1). The slider (3) has a convex cross section along the mold opening direction. The slider (3) is slidably connected in the slide groove (51) and the outer side wall of the slider (3) is in contact with the groove wall of the slide groove (51). The insert rod (4) is slidably connected in the mounting hole (52) and one side of the insert rod (4) is engaged with the slider (3) at the connection between the slide groove (51) and the mounting hole (52). The other side wall of the insert rod (4) is in contact with the hole wall of the mounting hole (52).
2. The slider core-pulling structure of the mold according to claim 1, characterized in that, The fixed module (1) is fixed with a limiting block (11), and the outer wall of the insertion rod (4) is recessed inward to form a limiting groove (42). The limiting block (11) is partially embedded in the limiting groove (42).
3. The slider core-pulling structure of the mold according to claim 2, characterized in that, There is a gap (6) between the limiting fixing block (11) and the guide slide (5).
4. The slider core-pulling structure of the mold according to claim 1, 2, or 3, characterized in that, The insertion rod (4) is cylindrical, and the lower end face of the insertion rod (4) is an annular inclined surface. The moving module (2) has a insertion groove (21). The lower end of the insertion rod (4) is embedded in the insertion groove (21) and the lower end face is in contact with the groove wall of the insertion groove (21).
5. The slider core-pulling structure of the mold according to claim 1, 2, or 3, characterized in that, The guide slide (5) is provided with an elastic positioning element (7), and two positioning grooves (32) are opened on the outer side wall of the slider (3). When the mold is closed, the end of the elastic positioning element (7) is embedded in one of the positioning grooves (32), and after the mold is opened, the end of the elastic positioning element (7) is embedded in the other positioning groove (32).
6. The slider core-pulling structure of the mold according to claim 5, characterized in that, The elastic positioning element (7) consists of a positioning spring (71) and a ball (72). One end of the positioning spring (71) is connected to the guide slide (5), and the other end is connected to the ball (72). The ball (72) can be embedded in the positioning groove (32).