Inner film pasting mold capable of guaranteeing quality
By adopting a combined structure of positioning pins and positioning sleeves and an improved oblique top rod design in the injection mold, the problem of film displacement and reversing buttons is solved, and efficient and accurate inner film forming and product molding process is achieved.
Patent Information
- Application Number
- CN202421522132.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-07-01
AI Technical Summary
During the injection molding process, when traditional molds produce products with films, they are prone to film displacement due to material pressure, resulting in position deviation and defective products. At the same time, the traditional oblique top rod structure has frictional obstacles, resulting in unsmoothing of the folding button.
A simple structure and clever design of inner film mold is designed, and a combined structure of positioning pins and positioning sleeves is adopted to ensure that the film does not displace under the push of molten materials. By improving the bottom structure of the inclined top rod, friction is reduced to ensure smooth reverse and core pulling of the product.
The molding of the product with the film is achieved in one process, ensuring the position accuracy of the film and the smooth molding of the product is achieved, reducing production costs and improving working efficiency.
Smart Images
Figure CN222755975U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of injection molding, in particular to an inner film mold capable of ensuring quality. Background Art
[0002] Injection molding is a low-cost mass production process for plastic products. Injection molds are required during the injection molding process. After the molds are closed, the molding machine injects molten material into the mold cavity. After the material cools, it forms a product that matches the shape of the cavity.
[0003] Some products need to have a hard film on their surface. When preparing such products, the traditional method is to first use a mold with a common structure to produce products without a film, and then use a one-step film laminating process to laminate the hard film on the surface of the product. In other words, two processes are required to complete the production of the product, which results in low work efficiency and relatively high production costs.
[0004] Now there is a new internal film process on the market, that is, the film is placed at the appropriate position of the core, and then the injection molding operation is performed. After the product is formed, the hard film will be combined with the product into an integrated structure, thus realizing one-time molding production;
[0005] However, the material pressure in the molten state is relatively high, and the material is likely to push the film to shift when entering the cavity, causing the position of the film to deviate, resulting in defective products.
[0006] At the same time, in traditional molds, ejector pins are generally used to realize the demolding action of the product. In most cases, the ejector pin will eject the product and the material handle together. A subsequent gate cutting process is required to separate the material handle from the workpiece. In addition, some products have undercut structures. Such undercut structures require the use of an inclined ejector pin structure to remove the undercut. However, the horizontal movement of the traditional inclined ejector pin structure has a certain friction force, which will hinder the horizontal movement of the inclined ejector, resulting in an unsmooth undercut action.
[0007] Therefore, a method or device capable of solving the above problems is now needed. Summary of the invention
[0008] The utility model aims to solve the above-mentioned deficiencies in the prior art and proposes a mold with simple structure, ingenious design, reasonable layout, and the ability to complete products with film pasting in one process while ensuring the quality of the products.
[0009] The technical solution of the utility model is: an inner film mold with guaranteed quality, including a fixed mold part and a movable mold part, the fixed mold part includes a fixed mold taking plate 1, a fixed mold plate 2 is arranged below the fixed mold taking plate 1, and a fixed mold core 3 is arranged in the fixed mold plate 2, the movable mold part includes a movable mold taking plate 4, square iron 5 and a movable mold plate 6 are arranged above the movable mold taking plate 4 in sequence, a push rod bottom plate 7 and a push rod plate 8 are arranged in the cavity between the movable mold plate 6 and the movable mold taking plate 4, and a movable mold core 9 is arranged in the movable mold plate 6. When the mold is closed, the fixed mold core 3 and the movable mold core 9 are enclosed together to form a cavity, characterized in that:
[0010] The fixed mold core 3 is provided with n positioning pins 10, and the movable mold core 9 is provided with n positioning sleeves 11 corresponding to the positioning pins 10 one by one. The ends of the positioning pins 10 can be inserted into the positioning sleeves 11 when the mold is closed. n is a natural number greater than 1.
[0011] The push rod plate 8 is provided with an inclined push rod 12, the bottom end surface of which contacts the side wall of a pin 13 provided in the push rod bottom plate 7, and the axis of the pin 13 is perpendicular to the mold opening direction. The top of the inclined push rod 12 is also provided with an undercut molding portion 14 in the horizontal direction.
[0012] A straight ejector 15 is also provided on the ejector plate 8, and a delayed straight ejector 16 is movably connected between the ejector plate 8 and the ejector bottom plate 7, a stop block 17 is provided at the bottom of the delayed straight ejector 16, and a delay groove 18 matching the stop block 17 is opened on the ejector bottom plate 7. In the mold closing state, the stop block 17 is located outside the delay groove 18.
[0013] Compared with the prior art, the utility model has the following advantages:
[0014] The quality-guaranteed inner film mold of this structural form has a simple structure, ingenious design and reasonable layout. It designs a special structure to solve the problems existing in the working process of the traditional inner film mold. First, at least two pairs of positioning pins and positioning sleeves are arranged in the cavity. The positioning pins are inserted into the positioning holes on the inner film in the mold closing state. At the same time, the positioning pins are also inserted into the corresponding positioning sleeves to improve the overall strength of the positioning pins. In this way, it can be ensured that the inner film will not be displaced under the push of the molten material, thereby ensuring the position accuracy of the inner film during the molding process; at the same time, it improves the bottom structure of the inclined ejector rod to make the horizontal movement of the inclined ejector rod smoother, thereby ensuring that the side core pulling action at the undercut position of the product can be carried out smoothly; at the same time, it also makes differentiated designs for the ejector rod for ejecting the product and the ejector rod for ejecting the material handle, so that the ejector rod of the ejector handle can delay the action, thereby realizing the action of the cutting handle through the relative movement between the product and the material handle; in summary, it can be said that this mold has many advantages, is particularly suitable for promotion and application in this field, and has a very broad market prospect. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.
[0016] Figure 2 yes Figure 1 Enlarged view of part A in .
[0017] Figure 3 yes Figure 1 Enlarged view of part B in .
[0018] Figure 4 It is a partial enlarged view of the cavity part in the embodiment of the utility model. DETAILED DESCRIPTION
[0019] The specific implementation of the present utility model will be described below in conjunction with the accompanying drawings. Figures 1 to 4 As shown: a quality-guaranteed inner film mold, including a fixed mold part and a movable mold part, the fixed mold part includes a fixed mold taking plate 1, a fixed mold plate 2 is arranged below the fixed mold taking plate 1, and a fixed mold core 3 is arranged in the fixed mold plate 2, the movable mold part includes a movable mold taking plate 4, square iron 5 and a movable mold plate 6 are arranged above the movable mold taking plate 4 in sequence, a push rod bottom plate 7 and a push rod plate 8 are arranged in the cavity between the movable mold plate 6 and the movable mold taking plate 4, and a movable mold core 9 is arranged in the movable mold plate 6. When the mold is closed, the fixed mold core 3 and the movable mold core 9 are surrounded together to form a cavity.
[0020] The fixed mold core 3 is provided with n positioning pins 10, and the movable mold core 9 is provided with n positioning sleeves 11 corresponding to the positioning pins 10 one by one. The ends of the positioning pins 10 can be inserted into the positioning sleeves 11 when the mold is closed. n is a natural number greater than 1.
[0021] The push rod plate 8 is provided with an inclined push rod 12, the bottom end surface of which contacts the side wall of a pin 13 provided in the push rod bottom plate 7, and the axis of the pin 13 is perpendicular to the mold opening direction. The top of the inclined push rod 12 is also provided with an undercut molding portion 14 in the horizontal direction.
[0022] A straight ejector 15 is also provided on the ejector plate 8, and a delayed straight ejector 16 is movably connected between the ejector plate 8 and the ejector bottom plate 7, a stop block 17 is provided at the bottom of the delayed straight ejector 16, and a delay groove 18 matching the stop block 17 is opened on the ejector bottom plate 7. In the mold closing state, the stop block 17 is located outside the delay groove 18.
[0023] The working process of the quality-guaranteed inner film mold of the embodiment of the utility model is as follows: in the mold opening state, the hard inner film 19 is first placed in the fixed mold core 3, and it is necessary to ensure that all the positioning pins 10 are inserted into the corresponding positioning holes opened on the inner film 19, and the inner film 19 is positioned by using these positioning pins 10;
[0024] In the mold closing state, the end of the positioning pin 10 will be inserted into the positioning sleeve 11 on the movable mold side. Such a structure can effectively improve the overall strength of the positioning pin 10 and prevent it from being deformed under the impact of high-pressure materials;
[0025] The molten material enters and fills the cavity, and forms a product after cooling, while the inner film 19 forms a part of the product;
[0026] After the mold is opened, the product is exposed to the air. Under the action of the molding machine, the ejector bottom plate 7 moves toward the product, which will drive the straight ejector 15 to move, and the straight ejector 15 will directly eject the product. In the early stage of the movement of the ejector bottom plate 7, since the delayed straight ejector 16 and the ejector bottom plate 7 are movably connected, the ejector bottom plate 7 will not drive the delayed straight ejector 16 to move temporarily. Only when the bottom end surface of the stop block 17 contacts the bottom end surface of the delay groove 18, the ejector bottom plate 7 will push the delayed straight ejector 16 to move. In other words, the action of the straight ejector 15 ejecting the product must precede the action of the delayed straight ejector 16 ejecting the material handle. The product is ejected when the material handle does not move, and the junction (gate) between the two will be disconnected under the action of shear stress, thereby realizing the separation of the product and the material handle.
[0027] After the product is ejected, the material handle will also be ejected by the delayed straight ejector rod 16 to realize the action of removing the material handle;
[0028] When the ejector bottom plate 7 and the ejector plate 8 move, the inclined ejector 12 is also pushed to move. The inclined ejector 12 is ejected upward along its own axial direction, and the undercut forming part 14 at its top end will produce a sub-movement in the horizontal direction, thereby realizing the lateral core pulling (undercut pulling) action; in this process, the bottom end surface of the inclined ejector 12 will slide relative to the side wall of the pin 13 in contact with it. Since the axis of the pin 13 is perpendicular to the mold opening direction, only a certain generatrix on the pin 13 is in contact with the bottom end surface of the inclined ejector 12, that is, the contact between the two is line-to-surface. Compared with the surface-to-surface contact method in the traditional structure, the contact area is greatly reduced, and the friction between the two is also greatly reduced, which can ensure that the core pulling action at the top of the inclined ejector 12 is smoother.
Claims
1. An inner film laminating mold capable of ensuring quality, comprising a fixed mold part and a movable mold part, the fixed mold part comprising a fixed mold taking-up plate (1), a fixed mold plate (2) being arranged below the fixed mold taking-up plate (1), a fixed mold core (3) being arranged in the fixed mold plate (2), the movable mold part comprising a movable mold taking-up plate (4), a square iron (5) and a movable mold plate (6) being arranged in sequence above the movable mold taking-up plate (4), a push rod bottom plate (7) and a push rod plate (8) being arranged in the cavity between the movable mold plate (6) and the movable mold taking-up plate (4), a movable mold core (9) being arranged in the movable mold plate (6), and when the mold is closed, the fixed mold core (3) and the movable mold core (9) are enclosed together to form a mold cavity, characterized in that: The fixed mold core (3) is provided with n positioning pins (10), and the movable mold core (9) is provided with n positioning sleeves (11) corresponding to the positioning pins (10) one by one, and the ends of the positioning pins (10) can be inserted into the positioning sleeves (11) when the mold is closed, and n is a natural number greater than 1. An inclined ejector rod (12) is arranged in the ejector rod plate (8), the bottom end surface of the inclined ejector rod (12) contacts the side wall of a pin (13) arranged in the ejector rod bottom plate (7), and the axis of the pin (13) is perpendicular to the mold opening direction. The top of the inclined ejector rod (12) is also provided with an undercut molding portion (14) located in the horizontal direction. A straight ejector rod (15) is also provided on the ejector plate (8), and a delayed straight ejector rod (16) is movably connected inside the ejector plate (8) and the ejector bottom plate (7). A stop block (17) is provided at the bottom of the delayed straight ejector rod (16), and a delayed groove (18) matching the stop block (17) is provided on the ejector bottom plate (7). In the mold closing state, the stop block (17) is located outside the delayed groove (18), the straight ejector rod (15) corresponds to the product, and the delayed straight ejector rod (16) corresponds to the material handle.