Automotive lighting parts dual-color injection mold

Abstract

This utility model relates to the field of automotive lighting injection mold technology, and more particularly to a two-color injection mold for automotive lighting accessories. It includes a base and a lower mold shell connected to the upper end of the base. Four positioning rods are provided at the upper end of the lower mold shell, which is connected to an upper mold shell via these four positioning rods. Four positioning cylinders are provided inside the upper mold shell, and the positioning cylinders are slidably connected to the positioning rods. The positioning rods and positioning cylinders are used for precise alignment and connection between the lower and upper mold shells. The base prevents the lower and upper mold shells from moving or shifting. The main ejection assembly includes a mounting seat, a drive module, a transmission module, a connecting module, and an ejection module located on the right end face of the lower mold shell. This utility model uses a double ejection, bidirectional, and multi-point ejection structure for demolding, reducing product deformation, cracking, and scratches caused by uneven stress. It has good adaptability to lighting accessories with curved surfaces, sharp edges, grooves, and other structures.

Description

Technical Field

[0001] This utility model relates to the field of automotive lighting injection mold technology, and in particular to a two-color injection mold for automotive lighting accessories. Background Technology

[0002] Two-color injection molds for automotive lighting parts are tools used to produce automotive lighting components. They employ a two-color injection molding process, which allows two different colors or materials of plastic to be combined in one operation to form a single finished part. Compared to traditional two-stage injection molding, which requires manufacturing one part first and then transferring it to another mold for a second injection, two-color injection molding can complete both steps on one machine, thereby reducing production time and costs.

[0003] The two materials used in two-color injection molding may have different shrinkage rates and adhesion, which may cause one part to stick to the other part or to the inside of the mold during demolding. At the same time, automotive lights usually contain complex curved surfaces and deep grooves. In common two-color injection molds for lights, the ejection mechanism is difficult to work effectively, which not only increases the difficulty of demolding, but also easily causes product deformation or surface damage.

[0004] Therefore, for the aforementioned dual-color injection mold for lighting fixtures, the two injection materials may have different shrinkage rates and adhesion. Conventional ejection mechanisms not only reduce demolding efficiency but also easily cause product deformation or surface damage. There is an urgent need to design a new type of dual-color injection mold for automotive lighting fixtures. Utility Model Content

[0005] To overcome the common problem of two-color injection molds for lighting fixtures, where the two injection materials may have different shrinkage rates and adhesion, conventional ejection mechanisms not only reduce demolding efficiency but also easily cause product deformation or surface damage.

[0006] The technical solution of this utility model is as follows: a two-color injection mold for automotive lighting parts, including a base; and a lower mold shell connected to the upper end of the base. Four positioning rods are provided at the upper end of the lower mold shell, and an upper mold shell is connected to the upper end of the lower mold shell via the four positioning rods. Four positioning cylinders are provided inside the upper mold shell, and the positioning cylinders are slidably connected to the positioning rods. The positioning rods and positioning cylinders are used for precise alignment and connection between the lower mold shell and the upper mold shell. The base prevents the lower mold shell and the upper mold shell from moving or shifting. The main demolding assembly includes a mounting seat, a drive module, a transmission module, a connecting module, and an ejection module located on the right end face of the lower mold shell. The auxiliary demolding assembly includes a moving plate, a sliding module, and an auxiliary demolding module located inside the base. The drive module is used to drive the transmission module to move. The connecting module is slidably connected to the transmission module, so that the connecting module does not move when the transmission module moves. The ejection module is used to eject the plastic part. The sliding module is slidably connected to the moving plate. Through external equipment, the moving plate is pushed, and the moving plate can move along the sliding module. The auxiliary demolding module follows the moving plate to assist in demolding the plastic part.

[0007] Preferably, the upper mold shell slides down along the four positioning rods on the lower mold shell via four internal positioning cylinders, ensuring precise alignment and tight closure of the upper and lower mold shells. The base provides stable support for the entire mold, preventing displacement or vibration during high-pressure injection molding. After the mold closes, the first color or material is injected. After cooling and setting, a second injection is performed to complete the two-color integrated molding. The cooperation between the positioning rods and positioning cylinders ensures that the upper and lower mold shells maintain a consistent positional relationship each time they close, improving molding accuracy and reducing problems such as mold misalignment and flash. The main ejection mechanism uses an inclined ejector rod to eject the product evenly from multiple points on the side, avoiding local stress concentration caused by ejection in a single direction and reducing the risk of product deformation, cracking, and scratches. The auxiliary ejection mechanism uses an ejector rod at the bottom or lower side to assist in ejection, enhancing the overall demolding power. It is particularly suitable for products with complex curved surfaces, inserts, or multi-cavity structures. The connecting module composed of sliding rods and sliding blocks keeps the connecting blocks stationary during transmission, providing a stable fulcrum and avoiding torque imbalance caused by synchronous movement, thus improving the stability and repeatability of the demolding process.

[0008] Preferably, the drive module includes an electric actuator mounted on the right end face of the mounting base, with the mounting base providing a stable fulcrum for the electric actuator.

[0009] Preferably, the transmission module includes a sliding block disposed at the output end of the electric push rod. A connecting block is slidably connected in the groove on the left end face of the sliding block. A mold body is disposed on the left end face of the sliding block. The connecting block can slide in the groove of the sliding block. The sliding block can slide in the sliding cavities of the lower mold shell and the upper mold shell. When demolding is required, the electric push rod drives the sliding block to move towards the mounting base, thereby moving the mold body and causing the ejection module to eject the plastic part.

[0010] Preferably, the connecting module includes a slide rod disposed on the left end face of the mounting base. The slide rod and the slide block are slidably connected. The end of the slide rod away from the mounting base is connected to a connecting block, so that the connecting block remains stationary when the slide block moves.

[0011] Preferably, the ejection module includes a first ejector rod disposed on the left end face of the connecting block. Multiple first ejector rods are disposed, and the multiple first ejector rods are slidably connected to the mold body. The multiple first ejector rods are evenly distributed inside the mold body, and the first ejector rods are used to eject the plastic parts.

[0012] Preferably, the sliding module includes a sliding rod disposed on the lower end face of the lower mold shell, the sliding rod being slidably connected to the moving plate, and the sliding rod being used to limit the movement of the moving plate.

[0013] Preferably, the ejection module includes multiple ejector pins 2 disposed on the upper surface of the movable plate. The ends of the multiple ejector pins 2 away from the movable plate extend into the inner cavity of the mold. The multiple ejector pins 2 are evenly distributed and slidably connected inside the lower mold shell. The multiple ejector pins 2 are used to assist in ejecting the plastic parts.

[0014] The beneficial effects of this utility model are:

[0015] 1. The main ejection mechanism ejects the product evenly from multiple points via the inclined side of ejector rod one, while the auxiliary ejection mechanism ejects the product from multiple points from the bottom via ejector rod two. By utilizing the double ejection, bidirectional and multi-point ejection structure, the demolding work is improved, demolding efficiency and product integrity are enhanced, local stress concentration caused by single-direction ejection is avoided, and product deformation, cracking and scratches caused by uneven force are reduced. It has good adaptability to lighting accessories with curved surfaces, edges, grooves and other structures.

[0016] 2. During the demolding process, keep the connecting block and ejector pin one stationary to provide a stable fulcrum for ejector pin one. This avoids torque imbalance caused by the synchronous movement of ejector pin one and the plastic part, thus improving the stability and repeatability of the demolding process. Attached Figure Description

[0017] Figure 1 The diagram shown is a three-dimensional structural schematic of the dual-color injection mold for automotive lighting accessories according to this utility model.

[0018] Figure 2The diagram shown is a three-dimensional disassembled structural diagram of the dual-color injection mold for automotive lighting accessories according to this utility model.

[0019] Figure 3 The diagram shown is a three-dimensional structural schematic of the two-color injection mold without an upper mold shell for automotive lighting accessories of this utility model.

[0020] Figure 4 The diagram shown is a three-dimensional structural schematic of the sliding rod of the dual-color injection mold for automotive lighting accessories of this utility model.

[0021] Figure 5 The diagram shown is a three-dimensional cross-sectional view of the two-color injection mold for automotive lighting accessories according to this utility model.

[0022] Figure 6 The diagram shown is a three-dimensional cross-sectional view of the two-color injection mold for automotive lighting accessories according to this utility model.

[0023] Explanation of reference numerals in the attached drawings: 1. Base; 2. Lower mold shell; 3. Positioning rod; 4. Upper mold shell; 5. Positioning cylinder; 6. Injection cylinder; 7. Mounting seat; 8. Electric push rod; 9. Slide rod; 10. Connecting block; 11. Sliding block; 12. Mold body; 13. Ejector rod one; 14. Moving plate; 15. Sliding rod; 16. Ejector rod two. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Please see Figures 1-6This utility model provides an embodiment of a two-color injection mold for automotive lighting accessories, including a base 1; and a lower mold shell 2 connected to the upper end of the base 1. Four positioning rods 3 are provided at the upper end of the lower mold shell 2, and an upper mold shell 4 is connected to the upper end of the lower mold shell 2 via the four positioning rods 3. Four positioning cylinders 5 are provided inside the upper mold shell 4, and the positioning cylinders 5 are slidably connected to the positioning rods 3. The positioning rods 3 and positioning cylinders 5 are used for precise alignment and connection between the lower mold shell 2 and the upper mold shell 4. The base 1 prevents the lower mold shell 2 and the upper mold shell 4 from moving or shifting. The main ejection assembly includes a mounting seat 7 disposed on the right end face of the lower mold shell 2. The system comprises a drive module, a transmission module, a connecting module, and an ejection module. The ejection auxiliary assembly includes a movable plate 14, a sliding module, and an ejection auxiliary module, all located inside the base 1. The drive module drives the transmission module. The connecting module is slidably connected to the transmission module, ensuring that the connecting module does not move while the transmission module moves. The ejection module ejects the plastic part. The sliding module is slidably connected to the movable plate 14. External equipment pushes the movable plate 14, allowing it to move along the sliding module. The ejection auxiliary module follows the movable plate 14, assisting in the demolding of the plastic part. (Upper mold shell) 4. The four internal positioning cylinders 5 slide down along the four positioning rods 3 on the lower mold shell 2, ensuring precise alignment and tight closure of the upper and lower mold shells 2. The base 1 provides stable support for the entire mold, preventing displacement or vibration during high-pressure injection molding. After the mold closes, the first color or material is injected. After cooling and solidification, a second injection is performed to complete the two-color integrated molding. The cooperation between the positioning rods 3 and the positioning cylinders 5 ensures that the upper and lower mold shells 2 maintain a consistent positional relationship each time they close, improving molding accuracy and reducing problems such as mold misalignment and flash. (Main machine offline) The ejector pin 13 is arranged at an angle, and ejects evenly from multiple points on the side, avoiding local stress concentration caused by ejection in a single direction. This reduces the risk of product deformation, cracking, and scratches. The auxiliary ejection mechanism uses ejector pin 2 16 at the bottom or lower side to assist ejection, enhancing the overall demolding power. It is particularly suitable for products with complex curved surfaces, inserts, or multi-cavity structures. The connecting module composed of slide bar 9 and slide block 11 keeps the connecting block 10 fixed during transmission, providing a stable fulcrum and avoiding torque imbalance caused by synchronous movement, thus improving the stability and repeatability of the demolding process.

[0026] Please see Figures 1-6In this embodiment, the drive module includes an electric push rod 8 mounted on the right end face of the mounting base 7. The mounting base 7 provides a stable fulcrum for the electric push rod 8. The electric push rod 8 is the power source for the main demolding assembly, pulling the sliding block 11 to move towards the mounting base 7. The transmission module includes a sliding block 11 disposed at the output end of the electric push rod 8. A connecting block 10 is slidably connected in the groove on the left end face of the sliding block 11. A mold body 12 is disposed on the left end face of the sliding block 11. The connecting block 10 can slide in the groove of the sliding block 11. The sliding block 11 can slide in the sliding cavities of the lower mold shell 2 and the upper mold shell 4. When demolding is required, the electric push rod 8 drives the sliding block 11 to move towards the mounting base 7. The mold body 12 is moved, so that the ejector module ejects the plastic part. The sliding block 11 can slide in the sliding cavity between the lower mold shell 2 and the upper mold shell 4, which facilitates the movement of the mold body 12. The upper mold shell 4 is equipped with an injection cylinder 6, which is used for injection molding. The connecting module includes a slide rod 9 set on the left end face of the mounting base 7. The slide rod 9 and the sliding block 11 are slidably connected. The end of the slide rod 9 away from the mounting base 7 is connected to a connecting block 10, so that the connecting block 10 remains stationary when the sliding block 11 moves. (The slide rod 9 plays a guiding and limiting role in the transmission process, so that the connecting block 10 does not move with the sliding block 11 when it moves, keeping the ejector rod 13 stable.)

[0027] Please see Figures 1-6 In this embodiment, the ejection module includes multiple ejector rods 13 disposed on the left end face of the connecting block 10. These ejector rods 13 are slidably connected to the mold body 12 and are evenly distributed inside the mold body 12. The ejector rods 13 are used to eject the plastic parts. (During demolding, the ejector rods 13 eject the plastic parts from multiple points on the side, avoiding stress concentration and reducing the risk of deformation and scratches.) The sliding module includes a sliding rod 15 disposed on the lower end face of the lower mold shell 2. The sliding rod 15 is slidably connected to the moving plate 14. Rod 15 is used to limit the movement of the moving plate 14 (it guides and limits the movement of the moving plate 14 to ensure its smooth movement without deviation or jamming). The auxiliary ejection module includes ejector rods 16 on the upper surface of the moving plate 14. Multiple ejector rods 16 are provided. The ends of the multiple ejector rods 16 away from the moving plate 14 extend into the inner cavity of the mold. The multiple ejector rods 16 are evenly distributed and slidably connected inside the lower mold shell 2. The multiple ejector rods 16 are used to assist in the ejection of the plastic parts (the auxiliary ejection module provides supplementary force to make up for the blind spots that the main ejection cannot cover).

[0028] During operation, the upper mold shell 4 slides down along the four positioning rods 3 on the lower mold shell 2 via four internal positioning cylinders 5. The sliding fit between the positioning rods 3 and the positioning cylinders 5 ensures that the upper mold shell 4 and the lower mold shell 2 are precisely aligned each time they close, avoiding defects such as misalignment and flash. After the upper mold shell 4 and the lower mold shell 2 are tightly fitted together, a complete cavity is formed for injection molding. The first color or material of plastic raw material is injected into the mold cavity. After the plastic cools and solidifies, the first part of the molding is completed. The mold is then opened and its position is adjusted (depending on the specific two-color structure design). Part of the structure rotates or moves, undergoing a second injection molding process. After cooling and solidification, the two materials are tightly bonded together to form a single two-color injection molded part. An electric push rod 8 is mounted on the right end face of the mounting base 7, serving as the power source for the main ejection mechanism. Activating the electric push rod 8 pushes the sliding block 11 towards the mounting base 7. The sliding block 11 connects to the mold body 12 and moves with it. The left end of the sliding block 11 has a groove that slides with the connecting block 10, ensuring that the connecting block 10 does not move with the sliding block 11. When the mold body 12 moves, the ejector rod 13 relative to the mold... The mold body 12 enters the cavity and applies ejection force to the plastic part. Multiple ejector pins 13 are inclined and evenly distributed, ejecting the product from multiple points on the side to avoid local stress concentration and reduce defects such as deformation and scratches. The movable plate 14 is located inside the base 1 and is slidably connected to the sliding rod 15 located at the lower end of the lower mold shell 2. Under the push of external equipment, the movable plate 14 slides smoothly along the sliding rod 15. Multiple ejector pins 16 are provided on the upper surface of the movable plate 14, distributed at multiple points. As the movable plate 14 moves, the ejector pins 16 simultaneously eject the plastic part, playing a role in assisting demolding. The main ejection mechanism is responsible for the main ejection task, ensuring that the product is smoothly separated from the main structure. The auxiliary ejection mechanism provides supplementary force to make up for the blind spots that the main ejection mechanism cannot cover. The two mechanisms work together to achieve a two-way, multi-point and balanced demolding effect, which significantly reduces the risks of mold jamming, deformation, and tearing, and improves the yield and production efficiency. After demolding, the electric push rod 8 runs in reverse, driving the sliding block 11 and the mold body 12 to reset. The moving plate 14 also returns to the initial position through external equipment. The entire mold is ready to enter the next cycle and carry out the next round of injection and demolding operations.

[0029] Through the above steps, the main ejection mechanism performs multi-point uniform ejection from the side using the inclined ejector rod 13, while the auxiliary ejection mechanism performs auxiliary multi-point ejection using the ejector rod 2 16 distributed at the bottom. This ejection structure adopts a bidirectional and multi-point synchronous ejection method, forming a more balanced force distribution during the ejection process, effectively improving the ejection efficiency and product integrity. This solves the common problem of dual-color injection molds for lamps, where the two injection materials may have different shrinkage rates and adhesion. Conventional ejection mechanisms not only reduce the ejection efficiency but also easily cause product deformation or surface damage.

Claims

1. A two-color injection mold for automotive lighting accessories, comprising a base (1); characterized in that: It also includes a lower mold shell (2) connected to the upper end of the base (1), four positioning rods (3) are provided at the upper end of the lower mold shell (2), and an upper mold shell (4) is connected to the upper end of the lower mold shell (2) through the four positioning rods (3). Four positioning cylinders (5) are provided inside the upper mold shell (4). The positioning cylinders (5) and the positioning rods (3) are slidably connected. The positioning rods (3) and the positioning cylinders (5) are used for precise alignment and connection between the lower mold shell (2) and the upper mold shell (4). The base (1) prevents the lower mold shell (2) and the upper mold shell (4) from moving or shifting. The demolding assembly includes a mounting base (7) on the right end face of the lower mold shell (2), a drive module, a transmission module, a connecting module and an ejection module. The auxiliary demolding assembly includes a moving plate (14) on the inner side of the base (1), a sliding module and an auxiliary demolding module. The drive module is used to drive the transmission module to move. The connecting module and the transmission module are slidably connected. When the transmission module moves, the connecting module will not move. The ejection module is used to eject the plastic part. The sliding module is slidably connected to the moving plate (14). The moving plate (14) can be pushed by an external device and can move along the sliding module. The auxiliary module moves with the moving plate (14).

2. The dual-color injection mold for automotive lighting accessories according to claim 1, characterized in that: The drive module includes an electric push rod (8) mounted on the right end face of the mounting base (7), which provides a stable connection to the electric push rod (8).

3. The dual-color injection mold for automotive lighting accessories according to claim 2, characterized in that: The transmission module includes a sliding block (11) set at the output end of the electric push rod (8). A connecting block (10) is slidably connected in the groove on the left end face of the sliding block (11). A mold body (12) is set on the left end face of the sliding block (11). The connecting block (10) can slide in the groove of the sliding block (11). The sliding block (11) can slide in the sliding cavity of the lower mold shell (2) and the upper mold shell (4). When demolding is required, the electric push rod (8) drives the sliding block (11) to move in the direction of the mounting base (7), thereby driving the mold body (12) to move.

4. The dual-color injection mold for automotive lighting accessories according to claim 3, characterized in that: The connection module includes a slide rod (9) set on the left end face of the mounting base (7). The slide rod (9) and the sliding block (11) are slidably connected. The end of the slide rod (9) away from the mounting base (7) is connected to a connecting block (10), so that the connecting block (10) cannot move when the sliding block (11) moves.

5. The dual-color injection mold for automotive lighting accessories according to claim 4, characterized in that: The ejection module includes ejector rod 1 (13) set on the left end face of the connecting block (10). Multiple ejector rods 1 (13) are provided. Multiple ejector rods 1 (13) are slidably connected to the mold body (12). Multiple ejector rods 1 (13) are evenly distributed inside the mold body (12). Ejector rods 1 (13) are used to eject plastic parts.

6. The dual-color injection mold for automotive lighting accessories according to claim 3, characterized in that: The sliding module includes a sliding rod (15) disposed on the lower end face of the lower mold shell (2). The sliding rod (15) is slidably connected to the moving plate (14). The sliding rod (15) is used to limit the movement of the moving plate (14).

7. The dual-color injection mold for automotive lighting accessories according to claim 6, characterized in that: The auxiliary ejection module includes ejector pins 2 (16) set on the upper end face of the moving plate (14). Multiple ejector pins 2 (16) are provided. The ends of the multiple ejector pins 2 (16) away from the moving plate (14) extend into the inner cavity of the mold. The multiple ejector pins 2 (16) are evenly distributed and slidably connected inside the lower mold shell (2). The multiple ejector pins 2 (16) are used to assist in ejecting the plastic parts.

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