Core pulling structure for mold
By designing a core-pulling structure for molds, and utilizing a combination of a moving wedge surface and a limiting port, the problem of damage to irregularly shaped workpieces caused by existing core-pulling structures is solved, resulting in a more precise core-pulling process and improved product quality.
Patent Information
- Application Number
- CN202423250111.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-27
AI Technical Summary
In the existing technology, during the molding process of thin-shell plastic workpieces, there is a technical problem that the core-pulling structure is not effective. In particular, the existing core-pulling structure is not effective. When dealing with irregularly shaped insertion holes, the core-pulling structure is prone to deformation or damage at the insertion hole molding area, resulting in poor accuracy and difficulty in controlling the force.
A core-pulling structure for molds is adopted, including a moving part and a core-pulling part. By moving the wedge-shaped surface to push the core-pulling wedge-shaped surface, the core-pulling part moves in an inclined direction. Combined with the design of the lifting groove and the limiting port, it provides a precise pushing and core-pulling action, reduces the pushing speed, improves the flexibility and adaptability of the core-pulling process, and reduces the risk of workpiece damage.
By using a wedge-shaped surface with an inclined direction and a limiting port design, a more precise core-pulling process is achieved, reducing the risk of workpiece damage, improving product quality, and enhancing the flexibility and adaptability of the core-pulling process.
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Figure CN223589992U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the field of injection molds, in particular to a core pulling structure for a mold. BACKGROUND
[0002] The injection mold is a device for manufacturing plastic parts by using the injection molding process, and has the characteristics of fast production speed, high efficiency, automatic operation and various types.
[0003] The mold structure also has many problems. For example, in the related art, there is a thin-shell plastic workpiece having an arc surface with a rectangular chamfer, and the workpiece has an insertion opening formed on both sides, and the insertion opening has an arc.
[0004] Before the thin-shell plastic workpiece is formed into an insertion opening, an inner core is provided, so that after pouring and forming, the insertion opening is formed at the inner core. When the inner core needs to be pulled out, a linear push-pull type structure is generally used for core pulling. This structure is relatively simple, but when dealing with insertion openings with irregular shapes, the insertion opening forming part of the workpiece is prone to deformation or damage, the precision is poor, and the force is difficult to control. SUMMARY
[0005] In order to improve the above problems, the application provides a core pulling structure for a mold.
[0006] The core pulling structure for the mold provided by the application adopts the following technical scheme:
[0007] A core pulling structure for a mold is applied to a fixed mold and a mold core in a mold, and is connected to a driving mechanism. The core pulling structure includes a moving part and a core pulling part. The moving part is provided with a moving wedge surface, and the core pulling part is provided with a core pulling wedge surface. The moving wedge surface and the core pulling wedge surface abut each other. When the moving part moves, the moving wedge surface pushes the core pulling wedge surface, so that the core pulling part moves in an inclined direction.
[0008] By using the above technical scheme, the external driving mechanism drives the moving part to move, the moving wedge surface pushes the core pulling wedge surface, so that the core pulling part is limited by the limiting opening and moves in an inclined direction, thereby separating from the formed core pulling opening. By using the pushing effect of the wedge surface with an inclination, the pushing speed can be reduced, a more accurate pushing and core pulling effect can be provided, the flexibility and adaptability of the core pulling process are improved, the risk of damage to the workpiece during the core pulling process is effectively reduced, and the product quality is improved.
[0009] Optionally, a lifting groove and a limiting opening are formed in the fixed mold. The moving part is located in the lifting groove and moves along the lifting groove. The core pulling part is located in the limiting opening and moves along the limiting opening. The lifting groove and the limiting opening are in communication.
[0010] By adopting the above technical solution, the lifting groove limits the moving part, and the limiting port limits the core pulling part, making the moving part and the core pulling part more precise in terms of movement position or movement path, thereby further reducing the risk of thin-shell products being damaged by core pulling during the demolding process.
[0011] Optionally, the limiting port extends through the lifting groove and communicates with the outside.
[0012] By adopting the above technical solution, the opening of the limiting port can provide a partial cooling effect, which accelerates the heat dissipation when the core pulling part comes into contact with the mold core or injection material.
[0013] Optionally, the lifting groove is a cylindrical groove, and the moving part has a cylindrical column structure.
[0014] By adopting the above technical solution, the cylindrical groove and cylindrical column structure enable the moving part to fit the lifting groove for lifting and lowering, reducing the gap between the moving part and the lifting groove, and thus reducing the movement error of the moving part.
[0015] Optionally, a following groove is provided on the moving wedge surface; a following protrusion is provided on the core-pulling part, the following protrusion is located in the following groove and moves along the following groove.
[0016] By adopting the above technical solution, when the moving part moves up and down or horizontally, it can use the limiting effect of the following groove and the following protrusion to drive the core pulling part to move, so that the core pulling part returns to the mold core or disengages from the core pulling opening.
[0017] Optionally, the groove shape of the following groove is a T-shaped groove or an I-shaped groove, and the style of the following protrusion matches the following groove, which is a T-shaped protrusion or an I-shaped protrusion.
[0018] By adopting the above technical solution, using T-slots or I-slots in conjunction with corresponding following protrusions, the positioning stability of the moving part and the core-pulling part can be guaranteed, preventing the core-pulling part from moving away from the moving part from a direction outside the following slot and ensuring the accuracy of movement.
[0019] Optionally, the opening of the follower slot is an open slot.
[0020] By adopting the above technical solution, the open slot allows the following protrusion to disengage from the following slot when the moving part continues to move, so that the moving part and the core-pulling part are no longer connected to each other, and the core-pulling part can be disengaged from the limiting port for easy replacement or maintenance.
[0021] Optionally, the fixed mold is further provided with cooling pipes, which are arranged around the core-pulling part.
[0022] By adopting the technical scheme, the core-pulling part can be rapidly cooled by the surrounding cooling pipeline, so that the injection material at the core-pulling part can be rapidly solidified and formed, and the influence of long-time cooling on the forming precision is reduced.
[0023] In summary, the present application has at least one of the following beneficial technical effects:
[0024] 1. The external driving mechanism drives the moving part to move and push the core-pulling wedge-shaped surface through the moving wedge-shaped surface, so that the core-pulling part is limited by the limiting port and moves in the inclined direction, thereby separating from the formed core-pulling port. The pushing effect of the wedge-shaped surface with inclination can reduce the pushing speed and provide more accurate pushing and core-pulling effect, improve the flexibility and adaptability of the core-pulling process, effectively reduce the damage risk of the workpiece during the core-pulling process, and improve the product quality.
[0025] 2. The lifting groove limits the movement of the moving part, and the limiting port limits the movement of the core-pulling part, so that the movement position or movement path of the moving part and the core-pulling part is more accurate, thereby further reducing the risk of damage to the thin-shell product during demolding.
[0026] 3. The opening of the limiting port can provide partial cooling effect, so that when the core-pulling part contacts the mold core or the injection material, the heat transfer is accelerated.
[0027] 4. The cylindrical groove and cylindrical column structure can make the moving part fit the lifting groove for lifting, reduce the gap between the moving part and the lifting groove, and reduce the movement error of the moving part. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 is a partial cross-sectional structure schematic diagram of a mold in an embodiment of the present application;
[0029] Figure 2 is an enlarged structure schematic diagram of A in the present application; Figure 1
[0030] Figure 3 is a three-dimensional structure schematic diagram of the core-pulling structure in a separated state in some embodiments of the present application;
[0031] Figure 4 is an exploded structure schematic diagram of a mold in some embodiments of the present application;
[0032] Figure 5 is a cross-sectional structure schematic diagram of a mold in some embodiments of the present application;
[0033] Figure 6 is an enlarged structure schematic diagram of B in the present application; Figure 5
[0034] The labels in the drawings are as follows: 1, fixed mold, 11, lifting groove, 12, limiting port, 13, slack groove, 14, slack part, 141, telescopic rod, 142, elastic layer, 143, slack part, 144, sliding block, 145, fastening screw, 146, threaded port, 2, movable mold, 3, mold core, 4, core-pulling structure, 41, moving part, 411, moving wedge surface, 412, following groove, 42, core-pulling part, 421, core-pulling wedge surface, 422, following protrusion, 423, magnetic attraction layer, 43, magnetic attraction rod, 5, cooling pipeline. DETAILED DESCRIPTION
[0035] The specific embodiments of the present application will now be described in detail with specific reference being made to the drawings. The following detailed description is disclosed with reference to the attached drawings. In the drawings, the same numbers are generally used to refer to identical or similar elements. Moreover, each embodiment contains only those features that are needed to fully understand the nature of the present application, as opposed to describing embodiments that are already well known. Other embodiments of the present application will be apparent to those of ordinary skill in the art from this detailed description.
[0036] The embodiments of the present application will be described below in detail with reference to the accompanying drawings. The present application can be embodied in various ways, and is not limited to the embodiments described herein.
[0037] In the description of the present application, the expressions "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics represented with the embodiment or example are included in at least one embodiment or example of the present application. Also, the specific features, structures, materials or characteristics represented can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the different embodiments or examples represented in the present application and the features of the different embodiments or examples can be combined and integrated by those skilled in the art without contradiction.
[0038] In addition, the terms "first", "second" are used only to indicate the objects, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0039] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.
[0040] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 This application will be described in further detail below.
[0041] This application discloses a core-pulling structure for molds.
[0042] A core-pulling structure for a mold, reference Figure 1 As shown, the mold used includes a fixed mold 1 and a moving mold 2, which fit together. The fixed mold 1 has a mold core 3 inside, and the mold core 3 and the inner wall of the fixed mold 1 form an injection sprue for forming a thin-shell product. The injection material is a hot melt product of the raw materials required for forming the thin-shell product. After the injection material enters the injection sprue, it cools and solidifies to form the thin-shell product.
[0043] The fixed mold 1 is equipped with a heating runner mechanism and a core-pulling structure 4. The heating runner mechanism provides the flow of injection molding material, while the core-pulling structure 4 provides the filling of the injection runner when holes are opened on the thin-shell product, so that the holes required for the thin-shell product are opened by separating the core-pulling structure 4 during molding.
[0044] Several core-pulling structures 4 are provided, and they are respectively set in the fixed mold 1 according to the product structure. The number of core-pulling structures 4 corresponds to the requirements of the injection-molded thin-shell products, and they are respectively located in the fixed mold 1. The position is determined according to the requirements. The core-pulling structure 4 is connected to a drive source, which can drive the core-pulling structure 4 to pull the core. If it is not in the drive source, it is not in the scope of the mold.
[0045] refer to Figure 2 As shown, the core-pulling structure 4 includes a movable part 41 and a core-pulling part 42. The movable part 41 has a movable wedge-shaped surface 411, and the core-pulling part 42 has a core-pulling wedge-shaped surface 421. The inclined direction of the core-pulling wedge-shaped surface 421 is consistent with that of the movable wedge-shaped surface 411, and the movable wedge-shaped surface 411 and the core-pulling wedge-shaped surface 421 abut against each other. The movable part 41 can be a movable cylinder, and the side of the movable cylinder closest to the mold core 3 is the core-pulling wedge-shaped surface 421. The core-pulling part 42 can be a different core-pulling shape, such as a core-pulling cylinder or a core-pulling square column, depending on the core-pulling opening style of the thin-shell product to be formed.
[0046] When the moving part 41 moves, it pushes the core-pulling wedge surface 421 by moving the wedge surface 411, so that the core-pulling part 42 is limited by the limiting port 12 and moves in the inclined direction, thereby disengaging from the formed core-pulling port and completing the core-pulling process.
[0047] The moving speed of the moving part 41 and the pushing speed of the core pulling part 42 are determined by the inclined angle of the moving wedge surface 411 and the pushing wedge surface and the driving speed of the external driving mechanism. Compared with directly pulling by the driving mechanism, the pushing speed can be reduced by using the pushing effect of the wedge surface with an inclination, the core pulling process is more flexible and adaptable, the risk of damage to the workpiece during demolding is effectively reduced, and the product quality is improved.
[0048] Specifically, the injection molding nozzle gradually fills the shell product with injection material, and after the core pulling structure 4 forms the core pulling hole on the shell product, the external driving mechanism drives the moving part 41 to move, and the moving wedge surface 411 pushes the core pulling wedge surface 421, so that the core pulling part 42 is limited by the limiting hole 12 and moves in the inclined direction, thereby separating from the formed core pulling hole. By using the pushing effect of the wedge surface with an inclination, the pushing speed can be reduced, a more accurate core pulling effect can be provided, the flexibility and adaptability of the core pulling process are improved, the risk of damage to the workpiece during core pulling is effectively reduced, and the product quality is improved.
[0049] Further, as shown in Figure 2 The moving part 41 is located in the lifting groove 11 and moves along the lifting groove 11, and the core pulling part 42 is located in the limiting hole 12 and moves along the limiting hole 12. The lifting groove 11 is communicated with the limiting hole 12, the moving part 41 is limited by the lifting groove 11, the internal style of the lifting groove 11 is consistent with the external surface style of the moving part 41, so that the moving part 41 can slide along the inner surface of the lifting groove 11, and the moving range and moving position of the moving part 41 can be more accurate. The core pulling part 42 is limited by the limiting hole 12, the style of the core pulling part 42 is consistent with the style of the limiting hole 12, so that the core pulling part 42 moves in close contact with the limiting hole 12, and the moving position or moving path of the core pulling part 42 is more accurate, thereby further reducing the risk of core pulling damage to the shell product during demolding.
[0050] Further, the limiting hole 12 penetrates the lifting groove 11 and is communicated with the outside, and the end of the limiting hole 12 away from the mold core 3 is in the form of an opening. The opening of the limiting hole 12 can provide partial cooling effect, so that when the core pulling part 42 contacts the mold core 3 or the injection material, the heat transfer is accelerated and the heat consumption is accelerated. When the moving part 41 is separated from the limiting hole 12, the core pulling part 42 can be separated from the mold, so as to facilitate maintenance or replacement.
[0051] Further, the lifting groove 11 is a cylindrical groove, and the moving part 41 is a cylindrical column structure. The cylindrical groove and the cylindrical column structure can make the moving part 41 lift along the lifting groove 11, reduce the gap between the moving part 41 and the lifting groove 11, reduce the movement error of the moving part 41, and ensure the accuracy of the movement path of the moving part 41.
[0052] In some embodiments, with reference to Figure 3 and Figure 4 As shown, the moving wedge surface 411 is provided with a following groove 412, and the core pulling part 42 is provided with a following protrusion 422, which is located in the following groove 412 and moves along the following groove 412.
[0053] The moving wedge surface 411 is provided with a following groove 412, which can be a T-shaped groove or an I-shaped groove. The core pulling part 42 is provided with a following protrusion 422, which has a shape matched with the groove type of the following groove 412. That is, when the following groove 412 is a T-shaped groove or an I-shaped groove, the following protrusion 422 can be a T-shaped protrusion or an I-shaped protrusion. Thus, the following protrusion 422 can be limited in the following groove 412 and cannot be separated from the following groove 412, and can move along the following groove 412. In this way, when the moving part 41 moves up and down or horizontally, the following groove 412 and the following protrusion 422 can limit the movement of the core pulling part 42, so that the core pulling part 42 returns to the mold core 3 or separates from the core pulling port.
[0054] The T-shaped groove or I-shaped groove matched with the corresponding following protrusion 422 can ensure the stable limitation of the moving part 41 and the core pulling part 42, and can avoid the core pulling part 42 moving in a direction other than the following groove 412 to separate from the moving part 41, thereby ensuring the accuracy of the movement.
[0055] Further, the following groove 412 has an open slot. When the moving part 41 continues to move, the following protrusion 422 can be separated from the following groove 412, so that the moving part 41 and the core pulling part 42 are not connected with each other, and the core pulling part 42 can be separated from the limiting port 12 for replacement or maintenance.
[0056] Further, with reference to Figure 3 and Figure 5 As shown, the following protrusion 422 is further provided with a magnetic layer 423, and the fixed mold 1 is provided with a detachable magnetic rod 43. After the moving part 41 and the core pulling part 42 are separated, the magnetic rod 43 can be detached and placed in the limiting port 12 to magnetically attract the magnetic layer 423 of the following protrusion 422. Then, the magnetic rod 43 is taken out of the limiting port 12, and the core pulling part is separated from the limiting port 12 under the magnetic attraction and pulling action of the magnetic rod 43, so as to conveniently take out the core pulling part.
[0057] The detachable connection between the fixed mold 1 and the magnetic rod 43 can be magnetic connection, such as providing a magnetic sheet or a magnetic material on the surface of the fixed mold 1, and the magnetic rod 43 can be directly attracted to the magnetic sheet or the magnetic material. The magnetic rod 43 can be a permanent magnet, and the magnetic sheet, the magnetic layer 423 or the magnetic material can all be iron sheets or permanent magnet sheets.
[0058] In some embodiments, referring to Figure 4 The fixed mold 1 is also provided with a cooling pipe 5, which is arranged around the core pulling part 42. The cooling pipe 5 can quickly cool the core pulling part 42, so that the injection material at the core pulling part 42 can be quickly solidified and formed, reducing the influence of long-time cooling on the forming precision.
[0059] In some embodiments, referring to Figure 5 and Figure 6 The fixed mold 1 is also provided with a tension slot 13, and the tension slot 13 is also provided with a tension piece 14. The tension piece 14 abuts against the moving part 41, so that the position of the moving part 41 is tight, avoiding the situation that the core pulling port is formed to be skewed or cracked due to looseness.
[0060] The tension piece 14 includes an extension rod 141, an elastic layer 142 and a tension part 143. The tension part 143 can be a tension roller or a tension ball. The extension rod 141 is installed in the tension slot 13, and the tension part 143 is movably connected with the extension rod 141. The elastic layer 142 covers the tension part 143, providing a buffer force and an elastic force for the tension part 143. The elastic layer 142 can be a rubber or plastic layer. When the tension part 143 abuts against the moving part 41, the elastic layer 142 can provide a stable friction force. Since the tension part 143 is movably connected with the extension rod 141, the tension part 143 rolls along the surface of the moving part 41 during the movement of the moving part 41, so that the moving part 41 is not affected by the friction force of the tension part 143, and can also be affected by the elastic force of the elastic layer 142, so as to be tightly arranged in the lifting groove 11 of the fixed mold 1, reducing the situation of skewing or inaccurate position.
[0061] On the other hand, referring to Figure 6As shown, the tight groove 13 is also provided with a threaded hole 146, the threaded hole 146 is provided with a fastening screw 145, the fastening screw 145 is screwed with the threaded hole, and penetrates the threaded hole into the limiting hole 12, the tight groove 13 is provided with a sliding block 144, the sliding block 144 is slidingly connected with the limiting hole 12, and the fastening screw 145 is pivotally connected with the sliding block 144, so that the fastening screw 145 can rotate along the sliding block 144 in the rotating process, and the sliding block 144 does not rotate simultaneously, but is affected by the pushing of the fastening screw 145, and will move along the tight groove 13, the tightness of the tight part 143 to the moving part 41 can be adjusted by the fastening screw, so as to avoid the wear of the tight part 143 after a period of use, and the tightness can be adjusted by the fastening screw.
[0062] The embodiments of the specific implementation are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.
Claims
1. A core-pulling structure for a mold, applied to a fixed mold (1) and a mold core (3) in a mold, and externally connected to a driving mechanism, characterized in that, The core-pulling structure (4) includes a moving part (41) and a core-pulling part (42); the moving part (41) has a moving wedge surface (411), and the core-pulling part (42) has a core-pulling wedge surface (421), and the moving wedge surface (411) and the core-pulling wedge surface (421) abut against each other; when the moving part (41) moves, it pushes the core-pulling wedge surface (421) through the moving wedge surface (411), thereby causing the core-pulling part (42) to move in the inclined direction.
2. The core-pulling structure for a mold according to claim 1, characterized in that, The fixed mold (1) is provided with a lifting groove (11) and a limiting port (12); the moving part (41) is located in the lifting groove (11) and moves along the lifting groove (11); the core pulling part (42) is located in the limiting port (12) and moves along the limiting port (12); the lifting groove (11) and the limiting port (12) are connected.
3. The core-pulling structure for a mold according to claim 2, characterized in that, The limiting port (12) passes through the lifting groove (11) and is connected to the outside.
4. The core-pulling structure for a mold according to claim 2, characterized in that, The lifting groove (11) is a cylindrical groove, and the moving part (41) has a cylindrical column structure.
5. A core-pulling structure for a mold according to claim 2, characterized in that, The moving wedge surface (411) is provided with a following groove (412); the core pulling part (42) is provided with a following protrusion (422), the following protrusion (422) is located in the following groove (412) and moves along the following groove (412).
6. The core-pulling structure for a mold according to claim 5, characterized in that, The groove of the following groove (412) is a T-shaped groove or an I-shaped groove, and the style of the following protrusion (422) matches the following groove (412), which is a T-shaped protrusion or an I-shaped protrusion.
7. The core-pulling structure for a mold according to claim 5, characterized in that, The slot of the follower slot (412) is an open slot.
8. The core-pulling structure for a mold according to claim 1, characterized in that, The fixed mold (1) is also provided with a cooling pipe (5), which is arranged around the core pulling part (42).