Exhaust structure for annular injection-molded product mold

Abstract

The utility model relates to a mould exhaust structure of annular injection product, and relates to the technical field of mould exhaust structure, including upper die and lower die, the upper die is connected with upper insert needle, the lower die is connected with lower insert needle, the upper die is equipped with forming cavity, the upper end portion of lower insert needle extends to the forming cavity and is with the lower end portion of upper insert needle is low, the utility model discloses solve the device in traditional technology when producing thin -walled annular product, adopt inside multiple runner and glue, when the average wall thickness of product is very thin, the velocity and pressure will be greater, if exhaust does not guide out mould, will produce bubble between runner and runner, affect the problem of product yield.

Description

Technical Field

[0001] This utility model relates to the field of mold venting structure technology, specifically to a venting structure for ring-shaped injection molds. Background Technology

[0002] Injection molding is a method of industrial product manufacturing, typically using rubber or plastic injection molding. Injection molding can be further divided into injection molding and die casting. An injection molding machine is the main molding equipment used to create various shapes of plastic products from thermoplastic or thermosetting materials using plastic molds. Injection molding is achieved through an injection molding machine and molds. Many plastic parts need to meet precise dimensional requirements, especially small-sized products with thin materials, where filling difficulties can prevent the product's dimensions and structure from meeting requirements.

[0003] As existing devices are used, the shortcomings of this technology have gradually become apparent, mainly in the following aspects:

[0004] When producing thin-walled ring-shaped products, the existing equipment uses multiple gates on the inside to inject the glue. In order to quickly fill the product and avoid material shortage at the bottom, high-speed and high-pressure injection molding conditions are often used. Especially when the average wall thickness of the product is very thin, the injection speed and pressure will be even greater. If the venting is not guided out of the mold, air bubbles will be generated between the gates, which will affect the yield of the product.

[0005] As can be seen from the above, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a venting structure for ring-shaped injection molds. This structure solves the problem that in traditional technologies, when producing thin-walled ring-shaped products, multiple gates are used for injection. When the average wall thickness of the product is very thin, the injection speed and pressure are higher. If the venting is not guided out of the mold, air bubbles will be generated between the gates, affecting the product yield.

[0007] To achieve the above objectives, the present invention provides the following technical solution.

[0008] A venting structure for a ring-shaped injection mold includes an upper mold core and a lower mold core. An upper insert is connected to the upper mold core, and a lower insert is connected to the lower mold core. The upper mold core has a molding cavity, and the upper end of the lower insert extends into the molding cavity and is flush with the lower end of the upper insert.

[0009] The upper end of the lower pin has several protrusions evenly distributed circumferentially near the outer edge. The top surface of the protrusions fits into the lower surface of the upper pin and forms a sprue through the area between adjacent protrusions. Each protrusion has an air storage groove on its top and an exhaust groove that connects the molding cavity to the air storage groove on its top.

[0010] As an optimized solution, one end of the exhaust groove is connected to the outer wall of the lower insert, and the other end of the exhaust groove is connected to the gas storage groove.

[0011] As an optimized solution, the depth of the gas storage tank is greater than the depth of the exhaust tank.

[0012] As an optimized solution, the width of the gating system is gradually reduced along the feeding direction.

[0013] As an optimized solution, the upper end of the lower insert is positioned at a height that gradually decreases from the outside to the center within the annular area containing several protrusions.

[0014] As an optimized solution, the upper insert pin is vertically through-shaped with a gluing channel that connects several of the gluing channels.

[0015] As an optimized solution, the lower insert has a vertically formed pin hole, and a pin is slidably disposed within the pin hole.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The original mold lacked a venting structure, and the top of the boss directly contacted the lower end of the upper insert, causing gas to accumulate between the runners and form bubbles. This solution, however, creates an air storage groove on the top of the boss and connects the molding cavity to the air storage groove through the venting groove, forming an air storage space. This allows gas in the mold to be promptly discharged into the air storage groove, solving the bubble problem. This improves the product's bubble problem, increases product yield, and reduces product costs. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the molding cavity structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the gating system of this utility model;

[0022] Figure 4 This is a structural diagram of the present invention in its assembled state.

[0023] In the diagram: 1-Upper mold core; 2-Lower mold core; 3-Lower insert; 4-Upper insert; 5-Ejector pin; 6-Boss; 7-Air reservoir; 8-Ventilation channel; 9-Molding cavity; 10-Gateway; 11-Product. Detailed Implementation

[0024] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0025] like Figures 1 to 4 As shown, the venting structure of the annular injection mold includes an upper mold core 1 and a lower mold core 2. An upper insert pin 4 is connected to the upper mold core 1, and a lower insert pin 3 is connected to the lower mold core 2. The upper mold core 1 has a molding cavity 9, and the upper end of the lower insert pin 3 extends into the molding cavity 9 and is flush with the lower end of the upper insert pin 4.

[0026] Several protrusions 6 are evenly distributed circumferentially at the upper end of the lower pin 3 near the outer edge. The top surface of the protrusions 6 is in contact with the lower surface of the upper pin 4, and a sprue 10 is formed through the area between adjacent protrusions 6. An air storage groove 7 is provided on the top of each protrusion 6, and an exhaust groove 8 is also provided on the top of the protrusion 6 to connect the molding cavity 9 with the air storage groove 7.

[0027] One end of the exhaust groove 8 is connected to the outer wall of the lower insert 3, and the other end of the exhaust groove 8 is connected to the air storage groove 7.

[0028] The depth of the gas storage tank 7 is greater than the depth of the exhaust tank 8.

[0029] The width of the gating channel 10 is gradually reduced along the feeding direction.

[0030] The upper end of the lower pin 3 is located in the annular area containing several protrusions 6, with the height gradually decreasing from the outside to the center.

[0031] The upper pin 4 has a vertical through-hole opening that connects several gating channels 10.

[0032] The lower insert 3 has a vertically opening ejector pin hole, and the ejector pin 5 is slidably installed in the ejector pin hole, which can eject the product 11 when the mold is opened.

[0033] The working principle of this device is as follows:

[0034] The original mold lacked a venting structure, and the top of the boss 6 was directly attached to the lower end of the upper insert 4, causing gas to accumulate between the runners 10 and form bubbles. This solution, however, creates an air storage groove 7 on the top of the boss 6 and connects the molding cavity 9 to the air storage groove 7 via the venting groove 8, forming an air storage space. This allows the gas in the mold to be discharged into the air storage groove 7 in a timely manner, solving the bubble problem. This improves the bubble problem of product 11, increases the yield of product 11, and reduces the cost of product 11. Specifically, when the mold opens, the upper insert 4 separates from the lower insert 3, allowing the gas in the air storage groove 7 to be discharged to the outside.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A venting structure for a ring-shaped injection mold, characterized in that: It includes an upper mold core (1) and a lower mold core (2). An upper insert pin (4) is connected to the upper mold core (1), and a lower insert pin (3) is connected to the lower mold core (2). A molding cavity (9) is provided on the upper mold core (1). The upper end of the lower insert pin (3) extends into the molding cavity (9) and is level with the lower end of the upper insert pin (4). The upper end of the lower insert (3) is provided with several protrusions (6) evenly distributed around the outer edge. The top surface of the protrusion (6) is in contact with the lower surface of the upper insert (4) and a sprue (10) is formed through the area between adjacent protrusions (6). Each protrusion (6) has an air storage groove (7) on its top. The top of the protrusion (6) also has an exhaust groove (8) that connects the molding cavity (9) and the air storage groove (7).

2. The venting structure for annular injection molded products according to claim 1, characterized in that: One end of the exhaust groove (8) is connected to the outer wall of the lower insert (3), and the other end of the exhaust groove (8) is connected to the gas storage groove (7).

3. The venting structure for annular injection molded products according to claim 1, characterized in that: The depth of the gas storage tank (7) is greater than the depth of the exhaust tank (8).

4. The venting structure for annular injection molded products according to claim 1, characterized in that: The width of the gating channel (10) is gradually reduced along the feeding direction.

5. The venting structure for annular injection molded products according to claim 1, characterized in that: The upper end of the lower insert (3) is located in the annular area where several protrusions (6) are located, and the height of the insert gradually decreases from the outside to the center.

6. The venting structure for annular injection molded products according to claim 1, characterized in that: The upper pin (4) has a vertical through-hole for connecting several of the gating channels (10).

7. The venting structure for annular injection molded products according to claim 1, characterized in that: The lower insert (3) has a vertically opened pin hole, and the pin (5) is slidably disposed in the pin hole.

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