Ox horn glue feeding structure without air marks on plastic mold

Abstract

The utility model discloses an ox horn glue feeding structure without air marks on a plastic mold. The inner diameter of the end part, close to a cavity, of an underflow channel is gradually reduced, and the underflow channel is formed by smoothly connecting a plurality of sections of cambered surfaces and inclined surfaces. According to the utility model, the cambered surface sections and the inclined surface sections are arranged at the glue injection end part in the oxhorn-shaped underflow channel at intervals, so that the glue can be guided to steer for multiple times, the flow velocity of the glue can be gradually reduced, the impact force of high-pressure glue on the inner wall of the underflow channel can be gradually reduced, and the glue injection port of the underflow channel can keep stable dimensional accuracy for a long time; therefore, the stable forming quality is ensured; the side wall is vertically arranged on one side of the glue injection port, so that the shearing force of the mold to the glue liquid injected into the cavity can be reduced to the greatest extent, the generation of gas marks at the glue inlet is eliminated or reduced, and the large inner diameter ratio of the two opening ends of the ox horn runner and the two end parts of the slow flow part can ensure that enough glue liquid is injected into the cavity in unit time, so that the production efficiency is improved. The forming defects such as insufficient injection, internal bubbles and white points are avoided, and the forming quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of plastic mold technology, and in particular to a horn-shaped injection structure for plastic molds without air bubbles. Background Technology

[0002] The horn-shaped sprue structure is a common sprue design used in plastic molds. The molten plastic enters the cavity from within the mold core (usually the moving mold core) through a bend and fills the cavity, leaving the sprue on the bottom or inner side of the plastic part, a non-exterior surface. This prevents marks from appearing on the product's surface when the mold is opened or removed later. However, during injection molding, the rapid change in flow direction when the molten plastic enters the cavity easily leads to the formation of air bubbles at the sprue. With increasingly higher market demands for quality and the need for assembly and structural fit on non-exterior surfaces, it is essential to remove or minimize air bubbles during the molding stage. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a horn-shaped injection structure for plastic molds that eliminates air bubbles. This structure can minimize the shear force exerted by the mold on the injection cavity, thereby eliminating or reducing air bubbles at the injection gate. Furthermore, the large inner diameter ratio of the two opening ends of the horn-shaped flow channel and the two ends of the slow-flow section ensures that a sufficient amount of adhesive is injected into the cavity per unit time, avoiding incomplete filling, internal air bubbles, white spots, and other molding defects, thus improving molding quality.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] The mold features a horn-shaped injection gate structure without air bubbles. A moving mold core is provided on the mold, and a cavity is formed on the moving mold core. This cavity is connected to a horn-shaped runner located within the moving mold core. The other opening end of the runner is located on the moving mold core and can connect to the injection gate on the fixed mold when the mold is closed. Wherein:

[0006] The inner diameter of the submersible channel gradually decreases at the end near the cavity, and it is formed by several sections with arc surfaces and inclined surfaces smoothly connected together. The inner wall of the channel connected to the cavity is inclined.

[0007] As a further explanation of the above technical solution:

[0008] In the above technical solution, the submersible channel includes a horn section and a flow-retarding section: the larger opening end of the horn section is provided on the moving mold core and can be connected to the injection channel; the inner wall of the flow-retarding section includes a first arc segment, a second arc segment, a first inclined surface segment, a third arc segment, and a second inclined surface segment connected in sequence, the first arc segment is smoothly connected to the smaller end of the horn section, and the second inclined surface segment is connected to the cavity.

[0009] In the above technical solution, the second inclined section forms a near-right trapezoidal structure in the submersible channel, with its smaller end face coplanar with the cavity, one side wall of which is relatively perpendicular to the cavity, and its larger end face inclined relative to the smaller end face.

[0010] In the above technical solution, the inner diameter of the flow channel formed by the second inclined section on the moving mold core is less than or equal to one-half of the inner diameter of the flow channel formed by the first arc section on the moving mold core.

[0011] In the above technical solution, the inner diameter of the flow channel formed at the smaller end of the bull horn portion is less than or equal to half of the inner diameter of the flow channel formed at the larger end.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting arc-shaped and inclined sections at intervals at the glue injection end in the horn-shaped submersible channel, the glue can be guided to change direction multiple times and its flow rate can be gradually reduced. It can also gradually reduce the impact force of high-pressure glue on the inner wall of the submersible channel, ensuring that the glue injection port of the submersible channel can maintain stable dimensional accuracy for a long time, thereby ensuring stable molding quality. By setting a side wall vertically on one side of the glue injection port, the shear force of the mold on the glue injection cavity can be reduced to the greatest extent, thereby eliminating or reducing the generation of air marks at the glue injection port. In addition, the large inner diameter ratio of the two opening ends of the horn-shaped runner and the two ends of the slow flow section can ensure that a sufficient amount of glue is injected into the cavity per unit time, avoiding molding defects such as incomplete filling, internal air bubbles, and white spots, and improving molding quality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a conventional horn-shaped flow channel.

[0014] Figure 2 This is a schematic diagram of the horn-shaped flow channel in this embodiment;

[0015] Figure 3 yes Figure 2 A magnified structural diagram of part A in the middle.

[0016] In the figure: 10, moving mold core; 20, cavity; 30, runner; 31, horn section; 32, slow flow section; 1, first arc segment; 2, second arc segment; 3, first inclined surface section; 4, third arc segment; 5, second inclined surface section; 51, smaller end face; 52, side wall; 53, larger end face. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as limiting this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0019] For ease of understanding, Figure 1 The diagram shows a conventionally used horn-shaped submersible channel. It can be seen that its inner wall is generally a smooth arc segment with a gradually decreasing inner diameter. During the rapid injection of high-pressure adhesive from the large end and its rapid outflow from the small end, due to the high outflow speed and sudden increase in spreading area, the adhesive at the junction of cavity 20 and submersible channel 30 is subjected to significant shear force, resulting in rings of air bubbles formed at this point after molding.

[0020] like Figure 2As shown, the mold features a horn-shaped injection gate structure without air bubbles. A moving mold core 10 is provided on the mold, and a cavity 20 is formed on the moving mold core 10. The cavity 20 is connected to a horn-shaped runner 30 located within the moving mold core 10. The other opening of the runner 30 is located on the moving mold core 10 and can connect with the injection gate on the fixed mold when the mold is closed. Wherein:

[0021] The inner diameter of the submersible channel 30 near the cavity 20 gradually decreases, and it is formed by several sections with arc surfaces and slopes smoothly connected. The inner wall of the channel connected to the cavity 20 is sloped.

[0022] Understandably, the inclined section not only further reduces the cross-sectional area of ​​the flow channel, but also, compared to the curved section, further slows down the flow rate of the adhesive and reduces the relative lateral force of the mold on the adhesive.

[0023] Specifically, such as Figure 3 As shown, the runner 30 includes a horn-shaped portion 31 and a flow-retarding portion 32. The larger opening end of the horn-shaped portion 31 is located on the moving mold core 10 and can communicate with the injection runner. The inner wall of the flow-retarding portion 32 includes a first arc segment 1, a second arc segment 2, a first inclined surface segment 3, a third arc segment 4, and a second inclined surface segment 5 connected in sequence. The first arc segment 1 is smoothly connected to the smaller end of the horn-shaped portion 31, and the second inclined surface segment 5 is connected to the cavity 20. In this embodiment, the second inclined surface segment 5 forms a near-right-angled trapezoidal structure in the runner 30. Its smaller end face 51 is coplanar with the cavity 20, one side wall 52 is perpendicular to the cavity 20, and its larger end face 53 is inclined relative to the smaller end face 51.

[0024] Understandably, the spaced arc and slope sections not only guide the adhesive to change direction multiple times and gradually reduce its flow rate, but also gradually reduce the impact force of the high-pressure adhesive on the inner wall of the submersible channel 30, ensuring that the injection port of the submersible channel 30 can maintain stable dimensional accuracy for a long time, thereby ensuring stable molding quality. At the same time, the side wall 52, which is vertically set on one side of the injection port, has almost no lateral shear force on the flowing adhesive, which can reduce the shear force of the mold on the adhesive to the greatest extent while ensuring that the adhesive enters the cavity 20 at a certain flow rate, thereby eliminating or reducing the generation of air marks at the injection port and improving molding quality.

[0025] Furthermore, the inner diameter of the flow channel formed on the moving mold core 10 by the second inclined section 5 is less than or equal to half of the inner diameter of the flow channel formed on the moving mold core 10 by the first arc section 1, and the inner diameter of the flow channel formed at the smaller end of the horn portion 31 is less than or equal to half of the inner diameter of the flow channel formed at its larger end.

[0026] Understandably, the relatively large inner diameter ratio of the two opening ends of the horn-shaped flow channel and the two ends of the slow flow section can ensure that a sufficient amount of glue is injected into the cavity 20 per unit time, so as to avoid molding defects such as incomplete filling, internal air bubbles, and white spots. In combination with the slow flow guiding structure of the slow flow section 32, it can minimize molding defects in various parts of the plastic product and improve molding quality.

[0027] The above does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A horn-shaped injection gate structure without air bubbles on a plastic mold, wherein a moving mold core is provided on the mold, a cavity is formed on the moving mold core, the cavity is connected to a horn-shaped runner located inside the moving mold core, and the other opening end of the runner is located on the moving mold core and can be connected to the injection gate on the fixed mold when the mold is closed; characterized in that: The inner diameter of the submersible channel gradually decreases at the end near the cavity, and it is formed by several sections with arc surfaces and inclined surfaces smoothly connected together. The inner wall of the channel connected to the cavity is inclined.

2. The horn-shaped injection structure on the mold without air bubbles as described in claim 1, characterized in that, The submersible channel includes a horn section and a flow-retarding section: the larger opening end of the horn section is located on the moving mold core and can be connected to the injection channel; the inner wall of the flow-retarding section includes a first arc segment, a second arc segment, a first inclined surface segment, a third arc segment, and a second inclined surface segment connected in sequence, the first arc segment is smoothly connected to the smaller end of the horn section, and the second inclined surface segment is connected to the cavity.

3. The horn-shaped injection structure on the mold without air bubbles as described in claim 2, characterized in that, The mold features a horn-shaped injection structure without air bubbles. The second inclined section forms a near-right trapezoidal structure within the submersible channel. Its smaller end face is coplanar with the cavity, one side wall is perpendicular to the cavity, and its larger end face is inclined relative to the smaller end face.

4. The horn-shaped injection structure on the mold without air bubbles as described in claim 2, characterized in that, The inner diameter of the flow channel formed by the second inclined section on the moving mold core is less than or equal to half of the inner diameter of the flow channel formed by the first arc section on the moving mold core.

5. The horn-shaped injection structure on the mold without air bubbles as described in claim 2, characterized in that, The inner diameter of the flow channel formed at the smaller end of the bull horn is less than or equal to half the inner diameter of the flow channel formed at the larger end.

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