Mould sprue structure and mould

Abstract

The utility model relates to the technical field of mold accessory equipment, in particular to a mold sprue structure and a mold. The mold sprue structure comprises an inlet section, one end of the inlet section is used for communicating with a branch runner, the other end of the inlet section communicates with a necking section, the necking section is used for communicating with a product forming cavity, and the inlet section is located on the side, away from the product forming cavity, of the necking section; the necking section is positioned above the product forming cavity; the communicating part of the necking section and the product forming cavity is expanded outwards to form a material cutting boss; a speed reduction table is formed in the necking section in an extending mode, a material passing gap is reserved between the speed reduction table and the other side wall of the necking section, and the speed reduction table is horizontally arranged. The injection molding device has the advantages that the possibility that the product forming device is full of molten plastic can be improved, the thrust required by the injection molding screw rod is reduced, the mold clamping force of the movable mold and the fixed mold is reduced, and the product quality is improved while the service life of the mold is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of mold accessories and equipment, and in particular to a mold gate structure and a mold. Background Art

[0002] As a modern means of transportation, cars need to be assembled and connected from thousands of parts made of different materials during the processing and assembly process. For the plastic parts, injection molding is generally used. During injection molding, the molten plastic needs to be injected into the mold cavity through the gate runner structure and cooled to form.

[0003] At present, there are many types of gates, such as point gates, side gates, straight gates and latent gates. When using, a suitable gate is selected according to the structural characteristics of the product. For example, the prior art discloses a die-casting mold gate structure, in which a plurality of cavities are arranged on the mold, and a plurality of runners are arranged in the middle position of the side of the mold, and the plurality of runners correspond to the plurality of cavities respectively. The junction of the runner and the mold is a gate, and the other end of the runner is a casting mouth.

[0004] In view of the above-mentioned related technologies, a semi-submerged side gate is used to inject molten raw materials into the product molding cavity. In order to ensure that the product molding cavity is full and reduce defects such as shrinkage holes, a larger injection pressure is required. At the same time, in order to reduce the generation of flash, the corresponding clamping force of the fixed mold and the movable mold also needs to be maintained in a higher range. When molding high-cavity products, using this type of gate will not only affect the product quality, but also affect the service life of the mold. Utility Model Content

[0005] In order to extend the service life of the mold and improve product quality at the same time, the present application provides a mold gate structure and a mold.

[0006] In a first aspect, the present application provides a mold gate structure, which adopts the following technical solution:

[0007] A mold gate structure, comprising

[0008] An inlet section, one end of which is connected to the branch channel, and the other end is connected to a necking section, which is used to communicate with the product forming cavity. The inlet section is located on the side of the necking section away from the product forming cavity, and the necking section is located above the product forming cavity.

[0009] By adopting the above technical scheme, the movable mold moves toward one side of the fixed mold until the movable mold and the fixed mold are closed. At this time, the cavity between the movable mold and the fixed mold is closed to form a product molding cavity. The injection molding machine works to feed the granular plastic into the hot melt injection molding screw for heating and feeding. The molten plastic flows to the inlet section through the main channel and several branch channels in turn, and then flows into the necking section, and finally is injected into the product molding cavity until the product molding cavity is full. The mold cooling unit works to cool the mold, so that the molten plastic in the product molding cavity is cooled and shaped to obtain a product. In this process, since the inlet section and the necking section are both located above the product molding cavity, during injection molding, the molten plastic flows into the product molding cavity under the thrust of the injection molding screw and its own gravity, which can increase the possibility of filling the molten plastic in the product former and reduce the thrust required for the injection molding screw, and then realize the reduction of the clamping force of the movable mold and the fixed mold, thereby extending the service life of the mold while improving the product quality.

[0010] In a specific possible implementation manner, a material-breaking boss is formed at the connection point between the necking section and the product forming cavity.

[0011] By adopting the above technical solution, the designed cutting boss can reduce the possibility of the gate structure separating the material at the connection of the product when separating the product and the gate after the product is formed.

[0012] In a specific possible implementation manner, a deceleration platform is formed extending out of the necking section, a material passing gap is left between the deceleration platform and the other side wall of the necking section, and the deceleration platform is arranged horizontally.

[0013] By adopting the above technical scheme, the molten plastic enters the entrance section through the main channel and the branch channel under the push of the injection screw. Since the entrance section is horizontally arranged and the necking section is vertically arranged, the molten plastic will flow into the necking section at a faster speed after flowing into the entrance section. At this time, the molten plastic with too fast flow rate will not only cause erosion to the side wall of the mold, but also generate bubbles during flow due to the gradual decrease in the diameter of the necking section. By setting a deceleration platform, the molten plastic can be buffered and decelerated, thereby extending the service life of the mold and improving the product molding quality.

[0014] In a specific possible implementation manner, the deceleration stage is connected to a side wall of the necking section away from the inlet section.

[0015] By adopting the above technical solution, the deceleration platform arranged on the side wall of the necking section away from the entrance section can improve the deceleration effect of the molten plastic.

[0016] In a second aspect, the present application provides a mold, which adopts the following technical solution:

[0017] A mold comprising

[0018] A fixed mold and a movable mold, the movable mold moves toward one side of the fixed mold and forms a product molding cavity and a gate structure after the molds are closed, the gate structure includes an inlet section, one end of the inlet section is used to communicate with the branch channel, and the other end is connected to a necking section, the necking section is connected to the product molding cavity, the inlet section is located on the side of the necking section away from the product molding cavity, and the necking section is located above the product molding cavity.

[0019] By adopting the above technical scheme, the movable mold moves toward one side of the fixed mold until the movable mold and the fixed mold are closed. At this time, the cavity between the movable mold and the fixed mold is closed to form a product molding cavity. The injection molding machine works to feed the granular plastic into the hot melt injection molding screw for heating and feeding. The molten plastic flows to the inlet section through the main channel and several branch channels in turn, and then flows into the necking section, and finally is injected into the product molding cavity until the product molding cavity is full. The mold cooling unit works to cool the mold, so that the molten plastic in the product molding cavity is cooled and shaped to obtain a product. In this process, since the inlet section and the necking section are both located above the product molding cavity, during injection molding, the molten plastic flows into the product molding cavity under the thrust of the injection molding screw and its own gravity, which can increase the possibility of filling the molten plastic in the product former and reduce the thrust required for the injection molding screw, and then realize the reduction of the clamping force of the movable mold and the fixed mold, thereby extending the service life of the mold while improving the product quality.

[0020] In a specific possible implementation manner, a material-breaking boss is formed at the connection point between the necking section and the product forming cavity.

[0021] By adopting the above technical solution, the designed cutting boss can reduce the possibility of the gate structure separating the material at the connection of the product when separating the product and the gate after the product is formed.

[0022] In a specific possible implementation manner, a deceleration platform is formed extending out of the necking section, a material passing gap is left between the deceleration platform and the other side wall of the necking section, and the deceleration platform is arranged horizontally.

[0023] By adopting the above technical scheme, the molten plastic enters the entrance section through the main channel and the branch channel under the push of the injection screw. Since the entrance section is horizontally arranged and the necking section is vertically arranged, the molten plastic will flow into the necking section at a faster speed after flowing into the entrance section. At this time, the molten plastic with too fast flow rate will not only cause erosion to the side wall of the mold, but also generate bubbles during flow due to the gradual decrease in the diameter of the necking section. By setting a deceleration platform, the molten plastic can be buffered and decelerated, thereby extending the service life of the mold and improving the product molding quality.

[0024] In a specific possible implementation manner, the deceleration stage is connected to a side wall of the necking section away from the inlet section.

[0025] By adopting the above technical solution, the deceleration platform arranged on the side wall of the necking section away from the entrance section can improve the deceleration effect of the molten plastic.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The designed mold gate structure, since the entrance section and the necking section are both located above the product molding cavity, during injection molding, the molten plastic flows into the product molding cavity under the thrust of the injection screw and its own gravity, which can increase the possibility of filling the product mold with molten plastic, reduce the thrust required for the injection screw, and subsequently achieve a decrease in the clamping force of the movable mold and the fixed mold, thereby extending the service life of the mold and improving product quality.

[0028] 2. The designed mold gate structure can buffer and decelerate the molten plastic by setting a deceleration platform, extend the service life of the mold, and improve the molding quality of the product.

[0029] 3. The designed mold gate structure is set on the deceleration platform on the side wall of the necking section away from the entrance section, which can improve the deceleration effect of the molten plastic. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the mold gate structure of an embodiment of the present application.

[0031] Figure 2 yes Figure 1 Added the structural diagram after the cutting boss.

[0032] Figure 3 yes Figure 2 Added the structural diagram after the reduction stage.

[0033] Explanation of the reference numerals: 1. inlet section; 2. necking section; 3. material cutting boss; 4. speed reduction platform; 5. fixed mold; 6. movable mold; 7. product molding cavity; 8. diverter channel. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-3 This application is described in further detail.

[0035] The embodiments of the present application disclose a mold gate structure and a mold.

[0036] Reference Figure 1A mold includes a fixed mold 5 and a movable mold 6. The movable mold 6 moves toward one side of the fixed mold 5 until the movable mold 6 and the fixed mold 5 are closed to form a product molding cavity 7, a main channel, a branch channel 8 and a gate structure. One end of the main channel is connected to the discharge end of the injection screw, and the other end is connected to the branch channel 8. The gate structure includes an inlet section 1 and a necking section 2. One end of the inlet section 1 is connected to the branch channel 8, and the other end is connected to the necking section 2. The end of the necking section 2 away from the inlet section 1 is connected to the product molding cavity 7.

[0037] Reference Figure 1 The entrance section 1 and the necking section 2 are both located above the product molding cavity 7 to reduce the injection pressure and the clamping force and extend the service life of the mold. In the present application, the entrance section 1 can be arranged horizontally or tilted. In order to facilitate the control of the jet angle of the molten plastic in the entrance section 1 entering the necking section 2, in the present embodiment, the entrance section 1 is arranged horizontally, the necking section 2 is arranged tilted downward, and the angle between the entrance section 1 and the necking section 2 is greater than ninety degrees.

[0038] Reference Figure 2 After the molten plastic is cooled and formed, in order to facilitate the separation of the product and the gate structure and reduce the possibility of the gate structure stripping off the components on the product, a cutting boss 3 is formed at the connection between the necking section 2 and the product molding cavity 7. The cutting boss 3 is set to be expanded in a circular arc shape, and the contact surface between the cutting boss 3 and the product is larger than the contact surface between the necking section 2 and the product.

[0039] Reference Figure 3 In order to further reduce the speed of the molten plastic being injected into the product molding cavity 7, a deceleration platform 4 is also included. The deceleration platform 4 is located in the necking section 2, and the deceleration platform 4 is horizontally arranged to facilitate demolding of the gate structure. In addition, in order to extend the service life of the mold and reduce the pressure loss at the sharp corners, in the present application, each structural connection is chamfered with an arc or a straight line.

[0040] Reference Figure 3 The deceleration platform 4 can be set on the movable mold 6 or on the fixed mold 5. In order to facilitate the deceleration platform 4 to be set on the side wall of the necking section 2 away from the entrance section 1, in the present application, the deceleration platform 4 is set on the movable mold 6, and a material passing gap is left between the deceleration platform 4 and the inner side wall of the necking section 2 on the fixed mold 5.

[0041] The implementation principle of a mold gate structure in the embodiment of the present application is as follows: the movable mold 6 moves toward one side of the fixed mold 5 until the movable mold 6 and the fixed mold 5 are molded together. At this time, the cavity between the movable mold 6 and the fixed mold 5 is closed to form a product molding cavity 7. The injection molding machine works to feed the granular plastic into the hot melt injection molding screw for heating and feeding. The molten plastic flows to the inlet section 1 through the main channel and several branch channels 8 in turn, and then flows into the necking section 2, and finally is injected into the product molding cavity 7 until the product molding cavity 7 is filled; and the inlet section 1 is horizontally arranged, and the necking section 2 is arranged toward the outside and tilted downward to increase the amount of molten plastic in the inlet section 1 entering the necking section 2. The jet angle in the mouth section 2 has an initial deceleration effect on the molten plastic. The mold cooling unit works to cool the mold, so that the molten plastic in the product molding cavity 7 is cooled and shaped to obtain a product. In this process, since the inlet section 1 and the necking section 2 are both located above the product molding cavity 7, during injection molding, the molten plastic flows into the product molding cavity 7 under the thrust of the injection screw and its own gravity, which can increase the possibility of filling the product former with molten plastic, reduce the thrust required for the injection screw, and subsequently achieve a decrease in the clamping force of the movable mold 6 and the fixed mold 5, thereby extending the service life of the mold while improving product quality.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A mold gate structure, characterized in that: include An inlet section (1), one end of the inlet section (1) is used to communicate with the branch channel (8), and the other end is connected to a necking section (2), and the necking section (2) is used to communicate with the product forming cavity (7). The inlet section (1) is located on a side of the necking section (2) away from the product forming cavity (7), and the necking section (2) is located above the product forming cavity (7).

2. The mold gate structure according to claim 1, characterized in that: A material-cutting boss (3) is formed at the connection point between the necking section (2) and the product forming cavity (7).

3. The mold gate structure according to claim 1, characterized in that: A deceleration platform (4) is formed extending from the inside of the necking section (2), a material passing gap is left between the deceleration platform (4) and the other side wall of the necking section (2), and the deceleration platform (4) is arranged horizontally.

4. The mold gate structure according to claim 3, characterized in that: The deceleration platform (4) is connected to a side wall of the necking section (2) away from the entrance section (1).

5. A mold, characterized in that: include A fixed mold (5) and a movable mold (6), wherein the movable mold (6) moves toward one side of the fixed mold (5) and forms a product molding cavity (7) and a gate structure after the molds are closed, wherein the gate structure comprises an inlet section (1), wherein one end of the inlet section (1) is used to communicate with a branch channel (8), and the other end is connected to a necking section (2), wherein the necking section (2) is connected to the product molding cavity (7), wherein the inlet section (1) is located on a side of the necking section (2) away from the product molding cavity (7), and the necking section (2) is located above the product molding cavity (7).

6. The mold according to claim 5, characterized in that: A material-cutting boss (3) is formed at the connection point between the necking section (2) and the product forming cavity (7).

7. The mold according to claim 5, characterized in that: A deceleration platform (4) is formed extending from the inside of the necking section (2), a material passing gap is left between the deceleration platform (4) and the other side wall of the necking section (2), and the deceleration platform (4) is arranged horizontally.

8. The mold according to claim 7, characterized in that: The deceleration platform (4) is connected to a side wall of the necking section (2) away from the entrance section (1).

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