In-mold gate cutting mechanism

Abstract

The utility model relates to injection mold technical field discloses an injection mold inner cut gate mechanism, including fixed mould board and movable mould board, the fixed mould board is used for closing and forms injection molding space with movable mould board and bears mould part, fixed mould kidney, the fixed mould kidney fixed connection in fixed mould board inboard, the fixed mould kidney is formed product cavity with movable mould kidney cooperation, movable mould kidney, movable mould kidney fixed setting in movable mould board inboard, movable mould kidney and fixed mould kidney jointly constitute product forming cavity. In the utility model, after injection molding, the oil cylinder is driven with the help of oil pressure circuit, the cutter fixing plate is driven through the jacks, the gate cutter is cut off before the mold opening, then the cutter plate fixed spring drives the cutter fixing plate reset, and the mold opening action is carried out, the injection mold internal automatic cutting gate is realized, manual secondary treatment is not needed, the traditional injection molding production needs manual pruning gate, the problem that leads to the consumption of manpower and low efficiency is solved, and the injection molding production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an internal gate cutting mechanism for injection molds. Background Technology

[0002] In the field of injection molding, molds are key production equipment, and their performance directly affects product quality and production efficiency. The gate, as a crucial structure connecting the runner and the cavity, must be separated from the product after injection molding. In traditional mold design, the gate treatment method significantly impacts the production process. To address this, an internal gate mechanism for injection molds has emerged, aiming to automate gate treatment through optimized structural design, thus meeting the demands of modern manufacturing for efficient and precise production.

[0003] In existing technologies, gate treatment of injection molds mostly relies on external auxiliary equipment or manual operation. Their mechanical structure usually does not include built-in cutting components. After injection molding, the mold is opened to remove the product with the gate, which is then trimmed manually using tools such as scissors and blades, or processed in subsequent processes using cutting equipment independent of the mold. The technical principle is mainly to use external force to separate the gate from the product, without linking it to the mold opening and closing and molding process.

[0004] In the existing technology, the gate needs to be handled manually or by external equipment after injection molding, which interrupts the production process and requires a lot of additional labor costs. Moreover, the speed of manual operation is limited and cannot be fully matched with the production rhythm of the injection molding machine, which seriously restricts the improvement of overall production efficiency and increases the time cost of the production process. It is difficult to meet the high-efficiency requirements of large-scale mass production. Therefore, an internal gate cutting mechanism for injection mold is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an internal gate cutting mechanism for injection molds, which aims to improve the problem that traditional injection molding production requires manual gate trimming, resulting in high labor costs and low efficiency.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: an internal gate cutting mechanism for injection molds, comprising:

[0007] A fixed template and a movable template, which are used to close and form an injection space and to support mold components;

[0008] A fixed mold core is fixedly connected to the inner side of a fixed mold plate, and the fixed mold core cooperates with the moving mold core to form a product cavity;

[0009] The moving mold core is fixedly disposed inside the moving mold plate, and the moving mold core and the fixed mold core together form the product forming cavity;

[0010] A gate cutter is mounted on a cutter fixing plate and is used to cut off the product gate.

[0011] A cutter fixing plate is connected to a top rod. The cutter fixing plate is used to fix the gate cutter and transmit driving force.

[0012] A push rod, one end of which is connected to a hydraulic cylinder and the other end of which is connected to a cutter fixing plate, is used to transmit the driving force of the hydraulic cylinder;

[0013] The hydraulic cylinder is connected to the hydraulic circuit and is used to provide the power for gate shut-off.

[0014] A cutting plate fixing spring is provided, which is connected between the cutting plate fixing plate and the moving template. The cutting plate fixing spring is used to drive the cutting plate fixing plate to reset.

[0015] A hydraulic circuit is connected to a hydraulic cylinder and is used to control the movement of the hydraulic cylinder.

[0016] A sealing assembly, comprising a sealing oil passage screw, a first rubber ring, and a second rubber ring, is used to prevent hydraulic oil leakage from the oil pressure circuit and the oil cylinder.

[0017] Furthermore, the fixed template is fixedly installed on the fixed mold side of the injection molding machine, and the fixed template is used to position and fix the fixed mold core.

[0018] Furthermore, the moving template is installed on the moving mold side of the injection molding machine. The moving template is used to install the moving mold core, hydraulic cylinder and cutting blade related components, and completes the mold opening and closing actions with the injection molding machine.

[0019] Furthermore, the blade of the gate cutter is aligned with the gate position, and the gate cutter is made of high-speed steel.

[0020] Furthermore, the extension and retraction stroke of the hydraulic cylinder is matched with the cutting stroke required by the gate cutter.

[0021] Furthermore, the cutter plate fixing spring keeps the gate cutter in its initial position under natural conditions, without affecting the product injection molding.

[0022] Furthermore, the hydraulic circuit can receive control signals from the injection molding machine to achieve precise control of the hydraulic cylinder's movements.

[0023] Furthermore, the first and second rubber rings are made of oil-resistant rubber, and the sealing oil circuit screw is threadedly connected to the oil cylinder.

[0024] This utility model has the following beneficial effects:

[0025] 1. In this utility model, after injection molding is completed, the hydraulic cylinder is driven by the hydraulic circuit, and the cutter fixing plate is driven by the ejector rod, so that the gate cutter cuts the gate before the mold opens. Then, the cutter plate fixing spring drives the cutter fixing plate to reset, and then the mold opens. This realizes automatic gate cutting inside the injection mold without the need for secondary manual processing. It achieves the effect of efficiently completing gate cutting in the injection molding process, solves the problem of traditional injection molding production requiring manual gate trimming, which leads to high labor costs and low efficiency, and improves the production efficiency of injection molded parts.

[0026] 2. In this utility model, by utilizing the synergistic cooperation of the mold's own structure, hydraulic drive, and spring reset, the gate cutter accurately cuts the gate and reliably resets, ensuring a smooth subsequent mold opening and part removal process. The cutter's action is stable and controllable, avoiding product scratches and gate residue that may occur when manually handling the gate. This achieves the effect of improving the molding yield and quality consistency of injection molded parts, solving the problem that manual operation can easily affect product quality, and enhancing the stability and reliability of injection molding production. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of an internal gate cutting mechanism for an injection mold proposed in this utility model;

[0028] Figure 2 This is a schematic diagram of the moving template structure of an internal gate cutting mechanism for injection molds proposed in this utility model;

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0030] Legend:

[0031] 1. Fixed mold plate; 2. Fixed mold core; 3. Moving mold plate; 4. Moving mold core; 5. Sprue cutter; 6. Cutter plate fixing spring; 7. Cutter fixing plate; 8. Ejector rod; 9. Hydraulic cylinder; 10. Sealing oil circuit screw; 11. Rubber ring one; 12. Rubber ring two; 13. Hydraulic circuit. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Reference Figures 1-3 One embodiment of this utility model provides: an internal gate cutting mechanism for injection molds, comprising:

[0034] Fixed template 1 and movable template 3 are used to close and form the injection space and support the mold components, ensuring the overall stability of the mold structure and providing precise guidance during the mold opening and closing process;

[0035] Fixed mold core 2 is fixedly connected to the inside of fixed mold plate 1. Fixed mold core 2 and moving mold core 4 cooperate to form product cavity, ensuring the accuracy and surface quality of product molding surface;

[0036] The moving mold core 4 is fixedly installed inside the moving mold plate 3. The moving mold core 4 and the fixed mold core 2 together form the product molding cavity, ensuring that the molten plastic fills the cavity evenly during the injection molding process.

[0037] The gate cutter 5 is mounted on the cutter fixing plate 7. The gate cutter 5 is used to cut off the product gate. Its blade design ensures a smooth cutting process and avoids burrs or residues.

[0038] The cutter fixing plate 7 is connected to the top rod 8. The cutter fixing plate 7 is used to fix the gate cutter 5 and transmit the driving force to ensure the stability of the cutter's movement trajectory.

[0039] Push rod 8, one end of push rod 8 is connected to oil cylinder 9, and the other end is connected to cutter fixing plate 7. Push rod 8 is used to transmit the driving force of oil cylinder 9 to ensure that the cutter action is synchronized with the stroke of oil cylinder 9.

[0040] Hydraulic cylinder 9 is connected to hydraulic circuit 13. Hydraulic cylinder 9 is used to provide power for gate cutting. Its output force is adjustable to meet the cutting requirements of different gate sizes.

[0041] The cutter plate fixing spring 6 is connected between the cutter fixing plate 7 and the moving template 3. The cutter plate fixing spring 6 is used to drive the cutter fixing plate 7 to reset, ensuring that the cutter automatically returns to the initial position after cutting.

[0042] Hydraulic circuit 13 is connected to hydraulic cylinder 9. Hydraulic circuit 13 is used to control the action of hydraulic cylinder 9 to achieve precise matching between the cutting sequence and the injection cycle.

[0043] The sealing assembly includes a sealing oil circuit screw 10, a rubber ring 11, and a rubber ring 2 12. The sealing assembly is used to prevent hydraulic oil leakage in the oil pressure circuit 13 and the oil cylinder 9, and to ensure the long-term stable operation of the hydraulic system.

[0044] Reference Figures 1-3The fixed mold plate 1 is fixedly installed on the fixed mold side of the injection molding machine. The fixed mold plate 1 is used to position and fix the fixed mold core 2, ensuring the alignment of the mold with the injection molding machine. The moving mold plate 3 is installed on the moving mold side of the injection molding machine. The moving mold plate 3 is used to install the moving mold core 4, the hydraulic cylinder 9, and related components such as the cutter. It completes the mold opening and closing actions with the injection molding machine, ensuring smooth mold movement. The cutting edge of the gate cutter 5 is aligned with the gate position. The gate cutter 5 is made of high-speed steel, which has high hardness and wear resistance, extending its service life. The extension and retraction stroke of the hydraulic cylinder 9 is related to the gate cutter... 5. The required cutting stroke is matched to ensure that the cutting action is complete and without interference. The cutting plate fixing spring 6 keeps the gate cutter 5 in the initial position in its natural state, which does not affect the product injection molding and avoids the cutter interfering with the plastic filling. The hydraulic circuit 13 can receive the control signal of the injection molding machine to realize the precise action control of the hydraulic cylinder 9, ensuring that the cutting action is synchronized with the injection molding process. Rubber ring 11 and rubber ring 2 12 are made of oil-resistant rubber material. The sealing oil circuit screw 10 is threadedly connected to the hydraulic cylinder 9 to prevent hydraulic oil leakage and facilitate maintenance.

[0045] Working principle: After the mold closes, the fixed mold plate 1 and the moving mold plate 3 press together. The fixed mold core 2 and the moving mold core 4 together form the product cavity. Molten plastic is injected into the cavity through the gating system to complete the filling, pressure holding and cooling process. At this time, the gate cutter 5 is kept in its initial position under the action of the cutter plate fixing spring 6 to ensure that it does not affect the plastic flow and product molding. After injection molding is completed, the injection molding machine sends a control signal to the hydraulic circuit 13 to drive the hydraulic cylinder 9 to move. The hydraulic cylinder 9 pushes the cutter fixing plate 7 and the gate cutter 5 towards the gate through the ejector rod 8. Since the stroke of the hydraulic cylinder 9 is precisely matched with the gate position, the high-speed steel material of the gate cutter 5 ensures that the gate is cut off quickly and cleanly. With no residue or burrs, the cutting action is completed before mold opening, avoiding the delay caused by manual trimming after mold opening in traditional processes. After cutting, the hydraulic circuit 13 releases the pressure of the cylinder 9, and the cutting plate fixing spring 6 pulls the cutting plate fixing plate 7 to reset, causing the gate cutter 5 to return to its initial position. Subsequently, the injection molding machine performs the mold opening action, the moving platen 3 separates from the fixed platen 1, and the molded product comes out with the moving mold core 4 and can be directly removed. Throughout the process, the sealing oil circuit screw 10, rubber ring 11 and rubber ring 2 12 ensure the sealing of the hydraulic circuit 13, ensuring the stability and reliability of the hydraulic drive. This achieves automatic gate cutting and mechanism reset in the injection cavity before mold opening, without the need for manual intervention.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gate-cutting mechanism for an injection mold, characterized in that, include: Fixed template (1) and movable template (3), the fixed template (1) and movable template (3) are used to close and form an injection space and carry mold components; Fixed mold core (2), which is fixedly connected to the inner side of fixed mold plate (1), and the fixed mold core (2) and the moving mold core (4) cooperate to form the product cavity; The moving mold core (4) is fixedly disposed inside the moving template (3), and the moving mold core (4) and the fixed mold core (2) together form the product molding cavity; A gate cutter (5) is mounted on a cutter fixing plate (7) and is used to cut off the product gate; Cutter fixing plate (7), the cutter fixing plate (7) is connected to the top rod (8), the cutter fixing plate (7) is used to fix the gate cutter (5) and transmit driving force; Top rod (8), one end of which is connected to oil cylinder (9) and the other end is connected to cutter fixing plate (7). The top rod (8) is used to transmit the driving force of oil cylinder (9). The hydraulic cylinder (9) is connected to the hydraulic circuit (13) and is used to provide power for gate cutting off; A cutting plate fixing spring (6) is connected between the cutting plate fixing plate (7) and the moving template (3). The cutting plate fixing spring (6) is used to drive the cutting plate fixing plate (7) to reset. The hydraulic circuit (13) is connected to the oil cylinder (9) and is used to control the action of the oil cylinder (9); A sealing assembly comprising a sealing oil passage screw (10), a first rubber ring (11) and a second rubber ring (12), the sealing assembly being used to prevent hydraulic oil leakage from the oil pressure circuit (13) and the oil cylinder (9).

2. The injection mold internal gate cutting mechanism according to claim 1, characterized in that: The fixed template (1) is fixedly installed on the fixed mold side of the injection molding machine. The fixed template (1) is used to position and fix the fixed mold core (2).

3. The injection mold internal gate cutting mechanism according to claim 1, characterized in that: The moving template (3) is installed on the moving mold side of the injection molding machine. The moving template (3) is used to install the moving mold core (4), the oil cylinder (9) and the cutting blade and related components, and completes the mold opening and closing actions with the injection molding machine.

4. The injection mold internal gate cutting mechanism according to claim 1, characterized in that: The blade of the gate cutter (5) is aligned with the gate position, and the gate cutter (5) is made of high-speed steel.

5. The injection mold internal gate cutting mechanism according to claim 1, characterized in that: The extension and retraction stroke of the hydraulic cylinder (9) is matched with the cutting stroke required by the gate cutter (5).

6. The injection mold internal gate cutting mechanism according to claim 1, characterized in that: The cutter plate fixing spring (6) keeps the gate cutter (5) in its initial position under natural conditions, without affecting the injection molding of the product.

7. The injection mold internal gate cutting mechanism according to claim 1, characterized in that: The hydraulic circuit (13) can receive the control signal of the injection molding machine and realize the precise action control of the hydraulic cylinder (9).

8. The injection mold internal gate cutting mechanism according to claim 1, characterized in that: The first rubber ring (11) and the second rubber ring (12) are made of oil-resistant rubber, and the sealing oil circuit screw (10) is threadedly connected to the oil cylinder (9).

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