Injection mold for a rear lamp housing of a motor vehicle

Abstract

The utility model discloses a injection mold for car rear lamp shell, specifically relates to lamp shell injection mold technical field, including base, be provided with injection molding assembly on the base, the injection molding assembly includes the connecting frame of setting at the top of base, the top of connecting frame is provided with the pressing plate, the top of connecting frame is provided with first mould body. The utility model discloses the cooperation of installation cavity and guide groove, limit the movement track of first mould body, extruding piece and top plate, avoid mould body deviation, at the same time, the relative surface of first mould body and second mould body has the curved surface recess of adapting rear lamp shell accurate processing, forms the closed and profile accurate forming cavity after mould closing, ensures that the molten raw material can completely fill buckle, sealing groove and so on complex structure, and the product detail degree of reproduction is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology for lamp housings, and more specifically, to an injection mold for automotive taillight housings. Background Technology

[0002] As a core protective component of the automotive lighting system, the taillight housing must simultaneously meet three core requirements: structural strength, sealing performance, and aesthetic compatibility. It not only needs to enclose and protect the internal light source and wiring from rain and dust, and secure the overall taillight structure, but also needs to match the curved surface design of the vehicle body, integrating complex functional structures such as mounting clips, sealing grooves, and wiring harness channels. Currently, this component is mostly injection molded from PC (polycarbonate), ABS, or PC / ABS alloy materials. These materials combine impact resistance, high-temperature resistance, and light transmittance adaptability, meeting the stringent usage requirements of automotive parts.

[0003] However, the complex structure of the rear light housing, such as its curved contour, multiple sets of clips, and deep cavity grooves, makes it difficult for the raw material to completely fill the molding cavity during injection molding, making it difficult to accurately replicate the product details. On the other hand, the molded product fits tightly to the inner wall of the mold, especially the clips and grooves, which are prone to sticking. External force is required to pull the product during demolding, which not only affects production efficiency but may also cause damage and deformation of the product's edges and corners, reducing the finished product qualification rate. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an injection mold for automotive taillight housing, which aims to solve the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: an injection mold for automotive taillight housing, including a base, on which an injection molding component is provided;

[0006] The injection molding assembly includes a connecting frame disposed on the top of the base, and a pressure plate is disposed on the top of the connecting frame;

[0007] The top of the connecting frame is provided with a first mold body, the bottom of the pressure plate is provided with a second mold body, and one end of the pressure plate and the first mold body is provided with an extrusion block. A forming cavity is formed between the second mold body, the first mold body and the extrusion block.

[0008] Optionally, in a possible implementation, a side connecting frame is provided on the outer side of the connecting frame, and a hydraulic rod is installed on the side connecting frame by bolts. The hydraulic rod is inclined upward, and a top plate is provided at the output end of the hydraulic rod. The top plate is located on one side of the extrusion block, and a plurality of springs are provided between the top plate and the extrusion block.

[0009] Optionally, in a possible implementation, the top of the pressure plate is provided with an injection nozzle, the bottom of which extends to the top of the first mold body for injecting raw materials. The top of the base is provided with a plurality of electric telescopic rods, and the output end of each electric telescopic rod passes through the connecting frame and extends to the pressure plate. The top of the connecting frame is provided with an installation cavity, and one side of the inner wall of the installation cavity is provided with a guide groove. The first mold body is located in the installation cavity, and the extrusion block and the top plate are both located in the guide groove and are slidably connected to the guide groove.

[0010] The technical effects and advantages of this utility model are as follows:

[0011] By cooperating with the mounting cavity and guide groove, the movement trajectory of the first mold body, extrusion block and top plate is limited to avoid mold body deviation; at the same time, the opposing surfaces of the first mold body and the second mold body are precisely machined with curved grooves that fit the rear lamp housing, forming a closed and precisely contoured molding cavity after mold closing, ensuring that the molten raw material can completely fill the complex structures such as buckles and sealing grooves, greatly improving the replicaness of product details.

[0012] The push structure, which combines hydraulic rods and springs, applies a steady pushing force to the extrusion block through the top plate during demolding. This, combined with the electric telescopic rod, drives the pressure plate to rise, achieving synchronous separation of the first mold body, the second mold body, and the product. This avoids product damage caused by external pulling. The lubricating coating on the inner wall of the guide groove further reduces sliding friction, ensuring a smooth and stable demolding process and improving production efficiency.

[0013] The electric telescopic rods are evenly distributed at the four corners of the pressure plate, providing uniform pressure when the mold is closed, ensuring the overall stability of the mold; the injection nozzle is precisely aligned with the feed port of the molding cavity, ensuring efficient and waste-free material injection; at the same time, the mold structure can be adapted to the contour requirements of different models of rear light housings by replacing the corresponding first mold body and second mold body, making it suitable for the production of various products. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0015] Figure 1 This is a front view of the overall structure of this utility model.

[0016] Figure 2 This is a cross-sectional view of the overall structure of this utility model.

[0017] Figure 3This is a schematic diagram of the connecting frame, pressure plate, mounting cavity, and guide groove of this utility model.

[0018] Figure 4 This is a schematic diagram of the base, electric telescopic rod, side frame, hydraulic rod, molding cavity, and extrusion block of this utility model.

[0019] The attached figures are labeled as follows: 1. Base; 2. Connecting frame; 3. Pressure plate; 4. First mold body; 5. Second mold body; 6. Molding cavity; 7. Extrusion block; 8. Side connecting frame; 9. Hydraulic rod; 10. Top plate; 11. Injection nozzle; 12. Electric telescopic rod; 13. Mounting cavity; 14. Guide groove. Detailed Implementation

[0020] 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.

[0021] This embodiment discloses an injection mold for automotive taillight housings, aiming to solve the technical problems in the prior art where the complex structure of the taillight housing, such as curved surfaces, clips, and grooves, leads to low injection molding replication accuracy and easy adhesion during the demolding process.

[0022] As attached Figure 1 Appendix Figure 2 As shown, the injection mold includes a base 1, an injection molding component, a drive component, and a guide component. The components work together to achieve precise injection molding and smooth demolding of the rear lamp housing.

[0023] The base 1 is a rectangular plate structure made of high-strength cast iron, which serves as the overall support.

[0024] The injection molding assembly is the core working unit of the mold, including the connecting frame 2, the pressure plate 3, the first mold body 4, the second mold body 5, and the extrusion block 7, which together form a molding cavity 6 that adapts to the shape of the rear lamp housing.

[0025] The drive assembly includes an electric telescopic rod 12 and a hydraulic rod 9, which are used to realize the mold closing action and the mold release pushing action, respectively.

[0026] The guiding components include mounting cavity 13 and guide groove 14, which ensure the accuracy of mold movement and demolding push.

[0027] As attached Figure 2 Appendix Figure 3As shown, the connecting frame 2 is fixedly installed at the top center of the base 1 by bolts. A rectangular mounting cavity 13 is opened at the top of the connecting frame 2, and the first mold body 4 is embedded in the mounting cavity 13 and fits tightly against the cavity wall. A guide groove 14 is opened on one side of the inner wall of the mounting cavity 13, and the guide groove 14 extends along the length direction of the connecting frame 2.

[0028] The pressure plate 3 is positioned directly above the connecting frame 2. A second mold 5 is bolted to the bottom of the pressure plate 3. The opposing surfaces of the second mold 5 and the first mold 4 are machined with curved grooves that perfectly match the shape of the automotive taillight housing. When the two are fitted together, they form a closed molding cavity 6. Extrusion blocks 7 are integrally formed on the left end of both the first mold 4 and the left end of the pressure plate 3. The two extrusion blocks 7 extend into the guide groove 14 and are slidably connected to the inner wall of the guide groove 14, as shown in the attached diagram. Figure 2 and 3 As shown.

[0029] As attached Figure 1 Appendix Figure 4 As shown, the drive assembly includes several electrically operated telescopic rods 12 and hydraulic rods 9:

[0030] The electric telescopic rods 12 are evenly distributed at the four corners of the top of the base 1. The cylinder body is fixed to the base 1 by the flange. The output end extends vertically upward and passes through the corresponding through hole of the connecting frame 2. Finally, it is fixedly connected to the bottom four corners of the pressure plate 3 to drive the pressure plate 3 to move up and down to realize the mold closing and opening actions.

[0031] A side connecting frame 8 is welded to the outer wall of the connecting frame 2, and a hydraulic rod 9 is fixedly installed on the side connecting frame 8 by bolts. The hydraulic rod 9 is inclined upward at a 35-degree angle to the horizontal direction, and its output end extends toward the guide groove 14, and a top plate 10 is fixedly installed at its end.

[0032] The top plate 10 is a rectangular block structure, embedded in the guide groove 14 and slidingly engaged with the groove wall. Springs are symmetrically arranged on the side of the top plate 10 opposite to the extrusion block 7. One end of the spring is welded to the top plate 10, and the other end abuts against the extrusion block 7, as shown in the attached figure. Figure 4 As shown.

[0033] As attached Figure 2 As shown, an injection nozzle 11 is provided through the center of the top of the pressure plate 3. The injection nozzle 11 is made of high-temperature resistant stainless steel. Its top is sealed to the feed pipe of the external injection molding machine, and its bottom extends through the pressure plate 3 to the top feed port of the first mold body 4, ensuring that the molten material can be accurately injected into the molding cavity 6.

[0034] The inner wall of the guide groove 14 is coated with a lubricating coating to reduce the friction when the extrusion block 7 and the top plate 10 slide, while ensuring the straightness of the motion trajectory and avoiding mold offset from affecting product accuracy.

[0035] The specific working principle is as follows: During the mold closing stage, the electric telescopic rod 12 is activated, and its output end extends and pushes the pressure plate 3 vertically downward. As the pressure plate 3 descends, the second mold body 5 gradually approaches the first mold body 4 until the two are completely fitted together. At this time, the curved groove between the first mold body 4 and the second mold body 5 forms a closed molding cavity 6, and the mold closing action is completed, as shown in the attached figure. Figure 2 The closed state is shown.

[0036] Molten PC / ABS alloy raw material is pressurized and delivered to injection nozzle 11 by an external injection molding machine. The raw material is injected into the molding cavity 6 through the feed channel of injection nozzle 11 until the raw material completely fills all corners of the molding cavity 6, including complex structures such as snap-fit ​​mounting positions, sealing grooves, and wire harness channels. After injection, the mold is kept closed to allow the raw material to cool and solidify within the molding cavity 6.

[0037] After the raw material solidifies to form the lamp housing product, the hydraulic rod 9 is activated, its output end extending and pushing the top plate 10 to slide in the guide groove 14 along an inclined direction. The top plate 10 transmits thrust to the extrusion block 7 through a spring, forcing the extrusion block 7 to simultaneously cause the first mold body 4 and the pressure plate 3 to separate. At the same time, the output end of the electric telescopic rod 12 slowly retracts, causing the pressure plate 3 to return to its vertical position, and the second mold body 5 to detach from the upper surface of the product. Under the continuous thrust of the hydraulic rod 9, the extrusion block 7 further pushes the first mold body 4 to move slightly, completely separating the product from the inner wall of the first mold body 4. Finally, the product falls smoothly into the preset collection area under its own gravity and thrust, completing the demolding process.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An injection mold for a car taillight housing, comprising a base (1), characterized in that: An injection molding assembly is provided on the base (1); The injection molding assembly includes a connecting frame (2) disposed on the top of the base (1), and a pressure plate (3) is disposed on the top of the connecting frame (2). The top of the connecting frame (2) is provided with a first mold (4), the bottom of the pressure plate (3) is provided with a second mold (5), and one end of the pressure plate (3) and the first mold (4) is provided with an extrusion block (7). A molding cavity (6) is formed between the second mold (5), the first mold (4) and the extrusion block (7).

2. The injection mold for an automotive taillight housing according to claim 1, characterized in that: A side connecting frame (8) is provided on the outside of the connecting frame (2), and a hydraulic rod (9) is installed on the side connecting frame (8) by bolts.

3. The injection mold for an automotive taillight housing according to claim 2, characterized in that: The hydraulic rod (9) is inclined upward, and the output end of the hydraulic rod (9) is provided with a top plate (10).

4. The injection mold for an automotive taillight housing according to claim 3, characterized in that: The top plate (10) is located on one side of the extrusion block (7), and a number of springs are provided between the top plate (10) and the extrusion block (7).

5. The injection mold for an automotive taillight housing according to claim 4, characterized in that: The top of the pressure plate (3) is provided with an injection nozzle (11), the bottom of which extends to the top of the first mold body (4) for injecting raw materials.

6. The injection mold for an automotive taillight housing according to claim 5, characterized in that: The base (1) is provided with a number of electric telescopic rods (12) on its top, and the output end of each electric telescopic rod (12) passes through the connecting frame (2) and extends to the pressure plate (3).

7. The injection mold for an automotive taillight housing according to claim 6, characterized in that: The top of the connecting frame (2) is provided with an installation cavity (13), and a guide groove (14) is provided on one side of the inner wall of the installation cavity (13).

8. The injection mold for an automotive taillight housing according to claim 7, characterized in that: The first mold body (4) is located in the mounting cavity (13), and the extrusion block (7) and the top plate (10) are both located in the guide groove (14) and are slidably connected to the guide groove (14).

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