A gate structure for an automotive bumper injection mold

Abstract

A gate structure for an injection mold of an automobile bumper includes a front mold with multiple gates. The number of gates exceeds the number of parking sensors on the bumper, and several gates are positioned one-to-one with the installation positions of the parking sensors. Each gate consists of a straight hole section and a tapered hole section connected together, with the smaller end of the tapered hole section connected to the mold cavity of the front mold via a sprue hole section. This invention, by assigning several gates to the installation positions of the parking sensors on the bumper, reduces injection pressure, decreases the amount of burrs generated, and avoids the impact of the formed parking sensor holes on the bumper quality, thus improving the appearance quality of the injection molded bumper.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, and in particular to a gate structure for an automotive bumper injection mold. Background Technology

[0002] Car bumpers not only serve a decorative function but also act as safety devices to absorb and buffer external impacts, protecting the vehicle body and occupants. As automakers place increasingly higher demands on bumpers and their part designs become more complex, the mold cavity structures used for injection molding car bumpers are also becoming more complex. The gates in the molds are generally located at the corresponding edge of the bumper, and there are often a large number of gates, resulting in higher injection pressure.

[0003] Bumpers produced by injection molding using this type of mold often have residual sprue at the gate location. Due to the large number of residual sprues, manual removal typically requires two workers. Automated removal increases equipment investment and demands more sophisticated and expensive jig designs. Furthermore, automated removal cannot guarantee a perfectly flush sprue surface with the bumper, failing to meet customer requirements. Additionally, the need for parking radar holes on the bumper leads to defects such as weld lines and burrs during hole molding, necessitating frequent mold repairs and further increasing costs.

[0004] Therefore, how to design a low-cost, high-quality injection mold for processing car bumpers is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a gate structure for an injection mold of an automotive bumper. By aligning several gates with the installation positions of the parking radar on the automotive bumper, it can reduce injection pressure, decrease the amount of burrs generated, and avoid the impact of the formed radar holes on the quality of the bumper, thereby improving the appearance quality of the injection molded bumper.

[0006] The technical solution of this utility model is: a gate structure for an injection mold of an automobile bumper, including a front mold of the injection mold, wherein the front mold of the injection mold is provided with multiple gates, the number of gates being greater than the number of parking radars on the automobile bumper, and the positions of several of the gates corresponding one-to-one with the installation positions of the parking radars on the automobile bumper. Each gate is composed of a straight hole section and a tapered hole section connected together, and the small end of the tapered hole section is connected to the mold cavity of the front mold of the injection mold through the sprue hole section.

[0007] The length of the feed head orifice is 0.2-0.6 cm.

[0008] The lines where each gate is located are perpendicular to the plane where the corresponding position of the car bumper is located.

[0009] The surface of the front mold of the injection mold is provided with a countersunk groove, and the straight hole section of the gate corresponding to the parking radar installation position at both ends of the car bumper is connected to the bottom of the countersunk groove.

[0010] The length of the material head hole section corresponding to the installation position of the parking radar in the middle of the car bumper is greater than the length of the material head hole section corresponding to the installation positions of the parking radar at both ends of the car bumper.

[0011] The above technical solution has the following beneficial effects: 1. The gate structure of the automotive bumper injection mold includes a front mold with multiple gates. These gates are used to assemble needle valves, injecting molten material from the hot runner into the mold cavity. The number of gates is greater than the number of parking sensors on the automotive bumper, and the positions of several gates correspond one-to-one with the installation positions of the parking sensors on the automotive bumper. After the molten material enters the mold cavity through the needle valves and gates, it fills the cavity and cools to form the automotive bumper product. Since the parking sensors are located in the middle of the automotive bumper, the molten material entering the cavity can spread evenly throughout the cavity, reducing the injection pressure and effectively reducing the amount of fuzz. Each gate is composed of a straight hole section and a tapered hole section connected together. The small end of the tapered hole section is connected to the mold cavity of the front mold of the injection mold through the sprue hole section. The shape of the gate is adapted to the shape of the needle valve to ensure the assembly stability of the needle valve in the gate. The sprue hole section retains molten material, ensuring that the molten material fills the mold cavity under reduced injection pressure, thus avoiding quality problems in the injection molded product. The resulting injection molded product (car bumper) uses conventional technologies such as ultrasonic punching, laser cutting, and milling to process radar holes at the installation position of the parking radar. Based on obtaining a high-quality car bumper, areas with poor molding quality, including the sprue structure, are removed simultaneously. This not only eliminates the impact of traditionally formed radar holes on injection molding but also reduces the difficulty of the injection molding process and improves the yield rate of injection molded products. In addition, the number of sprues that need to be removed manually is reduced, which also reduces the number of mold repairs and the amount of manual work.

[0012] 2. The straight lines where each gate is located are perpendicular to the plane where the corresponding position of the car bumper is located, so that the injected molten material is evenly dispersed along the cavity under pressure, ensuring molding quality.

[0013] 3. The length of the sprue hole section corresponding to the parking radar installation position in the middle of the car bumper is greater than the length of the sprue hole section corresponding to the parking radar installation positions at both ends of the car bumper. The amount of molten material injected into the cavity through the gate in the middle of the car bumper is greater than the amount of molten material injected into the cavity through the gates at both ends of the car bumper. By setting a longer sprue hole section, the overall injection molding quality of the car bumper is guaranteed.

[0014] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 A sectional view.

[0016] In the attached diagram, 1 is the front mold of the injection mold, 2 is the gate, 21 is the straight hole section, 22 is the tapered hole section, 3 is the sprue hole section, and 4 is the countersunk groove. Detailed Implementation

[0017] See Figure 1 and Figure 2 This is a specific embodiment of the gate structure of an injection mold for an automobile bumper. The gate structure of the automobile bumper injection mold includes a front mold 1, which is a conventional front mold structure and obviously has a front mold cavity. It is formed by closing the front mold cavity with the rear mold cavity of a conventional rear mold to form the cavity of the molded automobile bumper. The front mold 1 of the injection mold is provided with multiple gates 2. The number of gates 2 is greater than the number of parking radars on the car bumper, and the positions of several gates 2 correspond one-to-one with the installation positions of the parking radars on the car bumper. In this embodiment, six gates are symmetrically distributed along the mold cavity of the front mold. Four of these six gates correspond to the four parking radar installation positions on the straight section in the middle of the bumper, and the other two gates correspond to the parking radar installation positions at both ends of the bumper. The straight line where each gate 2 is located is perpendicular to the plane where the corresponding position of the car bumper is located. Since the two ends of the car bumper are bent backward, and the needle valves matched with the mold are of the same specification, in this case, the four gates set in the middle of the front mold of the injection mold are set perpendicular to the front mold, while the two gates set on both sides of the front mold of the injection mold extend inward at an angle. Correspondingly, countersunk grooves 4 need to be set on both sides of the surface of the front mold 1 of the injection mold. The straight hole section of the gate corresponding to the parking radar installation positions at both ends of the car bumper is connected to the bottom of the countersunk groove 4. Each of the gates 2 is composed of a straight hole section 21 and a tapered hole section 22 connected together, which is adapted to the shape of the needle valve. The small end of the tapered hole section 22 is connected to the mold cavity of the front mold of the injection mold through the sprue hole section 3. In this embodiment, the length of the sprue hole section 3 is 0.2-0.6cm. Since the flow rate of the gate in the middle is larger, the length of the sprue hole section corresponding to the parking radar installation position in the middle of the car bumper is greater than the length of the sprue hole section corresponding to the parking radar installation positions at both ends of the car bumper.

[0018] The working principle of this invention is as follows: Following a conventional configuration, hot runners and needle valves are assembled, and after mold closing, the matching needle valves inject pressurized molten material into the cavity formed by the mold closing through multiple gates. The molten material is evenly distributed along the cavity, resulting in a rough car bumper after molding. Residual material remains at the parking radar installation locations, indicating good overall molding quality. Using ultrasonic punching, laser cutting, and milling, radar holes are machined at the parking radar installation locations, simultaneously removing any remaining material. Residual material in other areas is manually removed, resulting in a high-quality car bumper.

Claims

1. A gate structure of an injection mold for an automobile bumper, comprising a front mold (1) of the injection mold, characterized in that: The injection mold front mold (1) is provided with multiple gates (2). The number of gates (2) is greater than the number of parking radars on the car bumper, and the positions of several gates (2) correspond one-to-one with the installation positions of the parking radars on the car bumper. Each of the gates (2) is formed by connecting a straight hole section (21) and a tapered hole section (22), and the small end of the tapered hole section (22) is connected to the mold cavity of the front mold of the injection mold through the sprue hole section (3).

2. The gate structure of an injection mold for an automobile bumper according to claim 1, wherein: The length of the feed head hole section (3) is 0.2-0.6cm.

3. The gate structure of an injection mold for an automobile bumper according to claim 1, wherein: The straight lines where each gate (2) is located are perpendicular to the plane where the corresponding position of the car bumper is located.

4. The gate structure of the automotive bumper injection mold according to claim 3, characterized in that: The surface of the front mold (1) of the injection mold is provided with a countersunk groove (4), and the straight hole section of the gate corresponding to the parking radar installation position at both ends of the car bumper is connected to the bottom of the countersunk groove (4).

5. The gate structure of the automotive bumper injection mold according to claim 2, characterized in that: The length of the material head hole section corresponding to the installation position of the parking radar in the middle of the car bumper is greater than the length of the material head hole section corresponding to the installation positions of the parking radar at both ends of the car bumper.

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