Anti-copper-pulling structure of injection mold

Abstract

The utility model discloses a kind of injection mold anti-copper piece pull injury structure, including movable mold cavity plate and core, the movable mold cavity plate is provided with mould nest, insert is fixed in the mould nest, the side of the insert is provided with insert fixed surface, the lower part of the mould nest is provided with cavity sealing material mouth, insert fixed surface and the inner wall surface of cavity sealing material mouth in mould nest are connected with each other, the outer side of the insert is provided with outer step plane, the mould nest is provided with mould nest cavity surface correspondingly, outer step plane and mould nest cavity surface are connected with each other.The core is inserted into the inside of insert and the inner wall of insert is contacted.The utility model is positioned by cooperating copper insert outer surface and mould cavity wall, cancels the original insert fixed mode by core, solves the problem of inner surface pull injury when copper insert is separated from core.

Description

Technical Field

[0001] This utility model relates to the field of injection molding pipe fitting mold technology, and in particular to a structure for preventing copper parts from being pulled apart in injection molds. Background Technology

[0002] Insert molding refers to a molding process in which pre-prepared inserts of different materials are placed into a mold, followed by resin injection. The molten material bonds and solidifies with the insert to create a one-piece product. Copper inserts installed in the mold commonly suffer from size variations. If the insert is too small, it becomes difficult to install, or even impossible, and subsequent injection molding can lead to severe tearing, resulting in scrap. If the insert is too large, flash will form after injection molding. Conventionally, copper inserts are fitted with a core, which secures the insert and prevents displacement. However, because it's difficult to ensure uniformity in insert dimensions, the core and insert may be in excessively tight contact. When the mold opens, the insert can easily tear its inner surface when it detaches from the core. During mold opening, ejector pins typically press against the plastic. Since the plastic has a long cooling time, if it doesn't cool sufficiently, the ejector pins can cause the product to cave in, resulting in a long production cycle. Utility Model Content

[0003] To address the aforementioned problems, this utility model aims to provide a structure for preventing copper parts from being scratched during injection molding, thereby solving the problem of easy scratching of the inner surface of the insert when the core of a tubular product with insert is removed.

[0004] The technical problem solved by this utility model can be achieved by the following technical solution: a structure for preventing copper parts from being pulled apart in an injection mold, comprising a moving mold cavity plate and a core, wherein a cavity is provided on the moving mold cavity plate, an insert is fixed inside the cavity, an insert fixing surface is provided on the side of the insert, a cavity sealing port is provided at the bottom of the cavity, the insert fixing surface and the inner wall surface of the cavity sealing port in the cavity are fitted and connected, an outer stepped plane is provided on the outer side of the insert, and a corresponding cavity surface is provided inside the cavity, the outer stepped plane being fitted and connected to the cavity surface. The core is inserted into the insert and contacts the inner wall of the insert.

[0005] The insert has an inner stepped surface inside, and an inner wall mating surface perpendicular to the inner stepped surface is provided on the inner side of the inner stepped surface. The outer wall surface of the core opening is fitted and connected to the inner wall mating surface of the insert near the inner stepped surface.

[0006] The opening edge of the core is chamfered.

[0007] The center lines of the cavity, insert, and core are all on the same straight line.

[0008] The bottom of the insert contacts the ejector pin, which is fixed to the moving template. The ejector pin passes through the moving mold cavity plate to the bottom of the mold cavity. The moving mold cavity plate is fixed to the moving template plate by mold feet.

[0009] The core is fixed on the core fixing plate. A fixed mold cavity plate is provided between the core fixing plate and the moving mold cavity plate. The fixed mold cavity plate and the core fixing plate are connected by plastic hooks. A spring is provided between the fixed mold cavity plate and the core fixing plate. One end of the spring is connected to the fixed mold cavity plate and the other end is connected to the core fixing plate.

[0010] The fixed mold cavity plate has a through hole, through which the core passes. The core fixing plate is fixedly connected to the fixed template by fixing screws.

[0011] Compared with the prior art, the present invention has the following advantages: 1. The copper insert is positioned by fitting with the outer surface of the copper insert and the mold cavity wall. The maximum gap between the copper insert and the cavity wall is allowed to be 0.5mm, which to some extent expands the dimensional accuracy tolerance of the copper insert.

[0012] 2. It breaks away from the conventional method of fixing inserts with cores. Instead, it fixes the inserts by mating the mold cavity wall with the outer surface of the copper insert, eliminating the need for core fixing and solving the problem of inner surface damage when the copper insert is removed from the core.

[0013] 3. The mold structure adopts a floating structure. After injection, during the mold opening process, the fixed mold cavity plate uses the action of springs to make the product separate from the core, avoiding the product and the core being too tightly wrapped and unable to separate.

[0014] 4. After the mold is opened, the ejector pins are placed on the copper inserts to prevent the ejector pins from denting the product due to insufficient cooling. Compared with the conventional ejector pins being placed on the plastic of the product, this reduces the cooling time, shortens the production cycle, and improves production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the mold; Figure 3 This is a schematic diagram of the overall structure of the mold; Figure 4 This is a structural diagram of the core and the product; Figure 5 A schematic diagram of the structure of the moving model cavity plate; Figure 6 This is a schematic diagram showing the fit between the moving model cavity plate and the insert; Figure 7 This is a schematic diagram of the core structure; Figure 8 This is a schematic diagram of the product's structure; In the diagram: 1-Fixed template, 2-Core fixing plate, 3-Core, 4-Product plastic part, 5-Insert, 6-Moving mold cavity plate, 7-Mold cavity, 8-Plastic hook, 9-Spring, 10-Moving template, 11-Fixed mold cavity plate, 12-Ejector pin, 13-Fixing screw, 14-Positioning guide post, 31-Core opening end, 32-Chamfer, 51-Insert fixing surface, 52-Outer step plane, 53-Inner step surface, 54-Inner wall mating surface, 71-Cavity sealing port, 72-Mold cavity surface. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0017] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] Combined with appendix Figures 1 to 8 As shown, this embodiment discloses a structure for preventing copper parts from being scratched in an injection mold, including a moving mold cavity plate 6 and a core 3. The moving mold cavity plate 6 has multiple mold cavities 7, and inserts 5 are fixed within each mold cavity 7. An insert fixing surface 51 is provided on the side of the insert 5, and a cavity sealing port 71 is provided at the bottom of each mold cavity 7. The insert fixing surface 51 and the inner wall of the cavity sealing port 71 in the mold cavity are in close contact. An outer stepped plane 52 is provided on the outer surface of the insert 5, and a corresponding mold cavity surface 72 is provided within each mold cavity 7. The outer stepped plane 52 is in close contact with the mold cavity surface 72. The core 3 is inserted into the insert 5 and contacts the inner wall of the insert 5. The center lines of the mold cavity 7, the insert 5, and the core 3 are on the same straight line.

[0019] The insert 5 has an inner stepped surface 53 inside, and an inner wall mating surface 54 perpendicular to the inner stepped surface 53 is provided on the inner side of the inner stepped surface 53. The outer wall surface of the opening end of the core 3 is fitted and connected to the inner wall mating surface 54 of the insert near the inner stepped surface 53 to achieve sealing and prevent the inside of the copper insert 5 from being completely covered by plastic during injection molding.

[0020] The opening edge of the core 3 is chamfered 32, which allows for quick insertion of the insert while avoiding damage to the inner stepped surface 53 of the copper insert. The contact area between the copper insert 5 and the core 3 is small, so the copper insert 5 will not be pulled or damaged during core removal.

[0021] Before injection molding, the copper insert 5 is placed into the mold cavity 7. The insert fixing surface 51 of the copper insert 5 is fitted and connected to the inner wall surface of the cavity sealing port 7 in the mold cavity, and the outer stepped plane 52 of the copper insert 5 is fitted and connected to the cavity surface 72 of the mold cavity. The insert is fixed in the mold cavity through the insert fixing surface 51 and the stepped plane 52 on the outside of the insert. After the mold is closed, the core 3 is inserted into the copper insert 5, and the outer wall surface of the core opening is fitted and connected to the inner wall mating surface 54 of the copper insert near the inner stepped surface 53.

[0022] The bottom of the insert 5 contacts the ejector pin 12, which is fixed to the moving template 10. The ejector pin 12 passes through the moving mold cavity plate 6 to the bottom of the mold cavity. The moving mold cavity plate 6 is fixed to the moving template 10 by mold feet. After mold opening, the ejector pin 12 presses against the copper insert 5 to prevent the ejector pin from denting the product due to insufficient cooling. Compared with the conventional ejector pin pressing against the plastic of the product, this reduces cooling time, shortens the production cycle, and improves production efficiency.

[0023] The core 3 is fixed on the core fixing plate 2. A fixed mold cavity plate 11 is provided between the core fixing plate 2 and the moving mold cavity plate 6. The fixed mold cavity plate 11 and the core fixing plate 2 are connected by a plastic hook 8. A spring 9 is provided between the fixed mold cavity plate 11 and the core fixing plate 2. One end of the spring 9 is connected to the fixed mold cavity plate 11, and the other end is connected to the core fixing plate 2. The fixed mold cavity plate 11 has a through hole, through which the core 3 passes. The mold structure adopts a floating structure. After injection, during the mold opening process, under the action of the spring 9, the fixed mold cavity plate 11 moves away from the core fixing plate, allowing the product 4 to detach from the core, avoiding the product and core being too tightly wrapped and unable to detach.

[0024] The core fixing plate 2 is fixedly connected to the fixed template 1 by fixing screws 13. The positioning guide post 14 is fixed on the fixed template 1, and the positioning guide post 14 passes through the fixed model cavity plate 11 and is slidably connected to the moving model cavity plate 6.

[0025] This invention uses the outer surface of the copper insert and the mold cavity wall for positioning and fitting. The maximum gap between the copper insert and the cavity wall is allowed to be 0.5mm, which to a certain extent expands the dimensional accuracy tolerance of the copper insert. It breaks away from the conventional method of fixing the insert with a core, and fixes it by fitting the outer surface of the copper insert with the mold cavity wall, thus solving the problem of inner surface damage when the copper insert is removed from the core.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the utility model in any way. Any simple modifications, equivalent changes, or alterations made to the above embodiments based on the technical principles of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A structure for preventing copper parts from being scratched in an injection mold, comprising a moving mold cavity plate (6) and a core (3), characterized in that: The moving mold cavity plate (6) is provided with a mold cavity (7), and an insert (5) is fixed in the mold cavity (7). The side of the insert (5) is provided with an insert fixing surface (51). The lower part of the mold cavity (7) is provided with a cavity sealing port (71). The insert fixing surface (51) and the inner wall surface of the cavity sealing port (71) in the mold cavity are fitted together. The outer side surface of the insert (5) is provided with an outer step plane (52). The mold cavity (7) is provided with a corresponding mold cavity surface (72). The outer step plane (52) is fitted together with the mold cavity surface (72). The core (3) is inserted into the insert (5) and contacts the inner wall of the insert (5).

2. The structure for preventing copper parts from being scratched in an injection mold according to claim 1, characterized in that: The insert (5) has an inner step surface (53) inside, and an inner wall mating surface (54) perpendicular to the inner step surface (53) is provided on the inner side of the inner step surface (53). The outer wall surface of the opening end of the core (3) is in contact with the inner wall mating surface (54) of the insert near the inner step surface (53).

3. The structure for preventing copper parts from being scratched in an injection mold according to claim 1, characterized in that: The opening edge of the core (3) is provided with a chamfer (32).

4. The structure for preventing copper parts from being scratched in an injection mold according to claim 1, characterized in that: The center lines of the cavity (7), insert (5) and core (3) are the same straight line.

5. The structure for preventing copper parts from being scratched in an injection mold according to claim 1, characterized in that: The bottom of the insert (5) is in contact with the ejector pin (12), which is fixed on the moving template (10) and passes through the moving mold cavity plate (6) to the bottom of the mold cavity.

6. The structure for preventing copper parts from being scratched in an injection mold according to claim 1, characterized in that: The core (3) is fixed on the core fixing plate (2). A fixed model cavity plate (11) is provided between the core fixing plate (2) and the moving model cavity plate (6). The fixed model cavity plate (11) and the core fixing plate (2) are connected by a plastic hook (8). A spring (9) is provided between the fixed model cavity plate (11) and the core fixing plate (2). A through hole is provided on the fixed model cavity plate (11). The core (3) passes through the through hole on the fixed model cavity plate (11).

7. The structure for preventing copper parts from being scratched in an injection mold according to claim 6, characterized in that: The core fixing plate (2) is fixedly connected to the template (1) by fixing screws (13).

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