A double-color injection mold core-pulling structure for a car tail lamp

Abstract

The utility model relates to a kind of automobile tail light two-color injection mould elastic plate core-pulling structure, belong to injection mould technical field, including movable mould fixed plate, movable mould fixed plate is equipped with fixed plate, fixed plate and movable mould fixed plate between are equipped with movable mould backing plate, movable mould backing plate and fixed plate between are respectively equipped with the first color movable mould elastic plate and second color movable mould elastic plate of mirror image symmetry type distribution, first color movable mould elastic plate and fixed plate between, second color movable mould elastic plate and fixed plate between are equipped with mould kernel, first color movable mould elastic plate is equipped with the first color core-pulling of penetrating mould kernel and extending out mould kernel end face, second color movable mould elastic plate is equipped with the second color core-pulling of penetrating mould kernel and extending out mould kernel end face.It has the characteristics of compact structure, good running stability and long service life.The core-pulling structure in mould is stable, and the processing cost is low and easy to install, reduces the product tensile injury phenomenon of once core-pulling action, ensures the quality of product, greatly improves the qualified rate, promotes production.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a spring plate core-pulling structure for a dual-color injection mold for automotive taillights. Background Technology

[0002] Modern automotive design increasingly emphasizes the overall aesthetics and styling of the exterior. As a crucial component for both appearance and safety, taillights are evolving towards integrated, continuous, and complex designs. Two-tone or even multi-tone injection molding can achieve seamless splicing and color gradients, perfectly aligning with this trend and making taillights more distinctive and technologically advanced.

[0003] Despite the obvious advantages of two-color injection molding, its application in complex products such as automotive taillights faces numerous technical challenges: The product has a complex structure and many undercuts: To achieve complex shapes and functions, taillight products often have a large number of internal undercuts, side holes, and clips. These structures must be detached by a core-pulling mechanism during mold opening; otherwise, the product cannot be removed.

[0004] Two-color molding processes place extremely high demands on mold structure: Two-color molds require two injection cycles to be completed within the same mold set, and the cavity must be converted or rotated. This necessitates an extremely compact mold structure, ensuring no interference between moving parts (such as core-pulling and ejection systems), and that the sequence of actions is precise. Demolding is achieved during mold opening using a slanted slide bar. This method has a relatively simple structure, but for complex products such as through-type taillights that are slender and require core pulling at both ends, it can result in a large mold size, complex structure, insufficient demolding space, and a tendency to jam.

[0005] The method uses a hydraulic cylinder to drive the slider seat, which in turn drives the inner core-pulling slider. While this method offers high power and controllability, it requires an additional hydraulic system, increasing costs and maintenance complexity. Furthermore, arranging the hydraulic cylinder within the mold occupies valuable space.

[0006] Two-color injection molding is achieved by rotating the mold, but this places high demands on the injection molding machine. For products with complex internal core-pulling structures, ensuring that the core-pulling mechanism can still operate accurately after rotation is a huge challenge. Summary of the Invention

[0007] This utility model primarily addresses the shortcomings of existing technologies by providing a spring-loaded core-pulling structure for a dual-color injection mold of automotive taillights. This structure features a compact design, good operational stability, and long service life. The internal core-pulling structure offers stability, low processing costs, and convenient installation. Reducing the number of core-pulling actions avoids product damage, ensuring product quality, significantly improving the pass rate, and promoting production.

[0008] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions: A dual-color injection mold core-pulling structure for automotive taillights includes a moving mold fixing plate, a fixed mold plate on the moving mold fixing plate, a moving mold pad between the fixed mold plate and the moving mold fixing plate, and a first-color moving mold core and a second-color moving mold core distributed in a mirror-symmetrical manner between the moving mold pad and the fixed mold plate. A mold core is provided between the first-color moving mold core and the fixed mold plate, and between the second-color moving mold core and the fixed mold plate. A first-color core-pulling device is provided on the first-color moving mold core, penetrating the mold core and extending beyond the mold core end face. A second-color core-pulling device is provided on the second-color moving mold core, penetrating the mold core and extending beyond the mold core end face.

[0009] The first color moving mold plate, the second color moving mold plate, and the moving mold pad are movably connected by limit screws.

[0010] Preferably, the moving mold pad is provided with a core-pulling seat between the moving mold pad and the first color core-pulling plate, and between the moving mold pad and the second color core-pulling plate, which are respectively inserted through the moving mold spring plate of the first color and the moving mold spring plate of the second color. The core-pulling seat is fixed to the moving mold pad with a snap-fit ​​screw.

[0011] Preferably, the core-pulling base and the first color core-pulling base, and the core-pulling base and the second color core-pulling base, are each provided with a core-pulling T-shaped guide rail that is screwed and fixed to the first color core-pulling base and the second color core-pulling base, respectively.

[0012] The bevel angle of the core puller should not exceed 30° to prevent excessive friction on the T-shaped guide rail.

[0013] Preferably, both sides of the core-pulling T-shaped guide rail are provided with core-pulling seat guide rails for guiding and limiting the core-pulling seat.

[0014] Preferably, a first-color ejector plate and a second-color ejector plate are respectively provided between the moving mold pad and the moving mold fixing plate. Mold feet are provided between the four corners of the moving mold pad and the moving mold fixing plate, and between the first-color ejector plate and the second-color ejector plate. The lower end of the moving mold fixing plate is provided with a plurality of ejector pins that penetrate the moving mold fixing plate and are respectively connected and fixed to the first-color ejector plate and the second-color ejector plate.

[0015] Preferably, fasteners fixed to the moving mold pad are provided between the side of the first-color moving mold spring plate and the side of the fixed mold plate, and between the side of the second-color moving mold spring plate and the side of the fixed mold plate. Opening the fasteners separates the moving mold pad from the first-color and second-color moving mold spring plates. These fasteners, also known as "hooks" or "sequential mold openers," are mechanical locking devices. After the first color injection molding is completed, the first-color moving mold spring plate and the moving mold pad cannot spring open due to the fasteners, preventing damage to the product during mold opening when the core is pulled out.

[0016] In the mold-closed state, the locking mechanism holds the moving mold platen and the moving mold spring platen together, allowing them to move as a single unit. During mold opening, the fixed mold platen first separates from the moving mold section. When the mold opens to a certain distance, the mechanical structure of the locking mechanism is triggered and "unhooked." At this point, the moving mold platen continues to move with the injection molding machine, while the moving mold spring platen, no longer constrained by the locking mechanism, stops moving (or moves with a delay). This separation of the moving mold platen and the moving mold spring platen creates relative displacement, thereby driving the core-pulling mechanism to complete the core-pulling action.

[0017] This invention can achieve the following effects: This invention provides a core-pulling structure for a dual-color injection mold of automotive taillights, which, compared with existing technologies, features a compact structure, good operational stability, and long service life. The core-pulling structure within the mold is stable, has low processing costs, and is easy to install. Reducing the number of core-pulling actions avoids product damage, ensures product quality, significantly improves the pass rate, and promotes production.

[0018] Compact and integrated design: The core-pulling drive mechanism (spring plate) is cleverly combined with the main structural plate of the mold (moving mold pad), eliminating the need for additional hydraulic cylinders or motors, simplifying the mold structure and reducing costs.

[0019] Precise control: Through the combination of the buckle, T-shaped guide rail and core-pulling seat guide rail, precise control of the timing, trajectory and accuracy of the core-pulling movement is achieved.

[0020] Suitable for two-color processes: It adopts a mirror-symmetrical double spring plate, double core pulling, and double ejection system design, which is perfectly adapted to the production requirements of two-color injection molding and can efficiently produce automotive taillights with complex two-color structures.

[0021] High reliability and long lifespan: The purely mechanical drive and guidance method has a lower failure rate, simpler maintenance, and longer service life compared to hydraulic or pneumatic systems. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a structural cross-sectional view of the present invention.

[0024] In the diagram: 1. Fixed template; 2. Fastener; 3. First color moving mold spring plate; 4. Moving mold pad; 5. Mold foot; 6. Moving mold fixing plate; 7. First color ejector plate; 8. Second color ejector plate; 9. Second color moving mold spring plate; 10. Mold core; 11. Second color core puller; 12. First color core puller; 13. Core puller T-shaped guide rail; 14. Core puller seat; 15. Core puller seat guide rail; 16. Ejector pin. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0026] Example: Figure 1 and Figure 2 As shown, a spring plate core-pulling structure for a dual-color injection mold for automotive taillights includes a moving mold fixing plate 6, a fixed template 1 on the moving mold fixing plate 6, a moving mold pad 4 between the fixed template 1 and the moving mold fixing plate 6, a first-color ejector plate 7 and a second-color ejector plate 8 respectively between the moving mold pad 4 and the moving mold fixing plate 6, mold feet 5 between the four corners of the moving mold pad 4 and the moving mold fixing plate 6, and between the first-color ejector plate 7 and the second-color ejector plate 8, and eight ejector pins 16 that penetrate the moving mold fixing plate 6 and are respectively connected and fixed to the first-color ejector plate 7 and the second-color ejector plate 8 at the lower end of the moving mold fixing plate 6. A first-color moving mold spring plate 3 and a second-color moving mold spring plate 9 are respectively provided in a mirror-symmetrical arrangement between the moving mold pad 4 and the fixed mold plate 1. A fastener 2 fixed to the moving mold pad 4 is provided between the side of the first-color moving mold spring plate 3 and the side of the fixed mold plate 1, and between the side of the second-color moving mold spring plate 9 and the side of the fixed mold plate 1. The moving mold pad 4 is separated from the first-color moving mold spring plate 3 and the second-color moving mold spring plate 9 by opening the fastener 2. A mold core 10 is provided between the first-color moving mold spring plate 3 and the fixed mold plate 1, and between the second-color moving mold spring plate 9 and the fixed mold plate 1. A first-color core puller 12 is provided on the first-color moving mold spring plate 3, penetrating the mold core 10 and extending beyond the end face of the mold core 10. A second-color core puller 11 is provided on the second-color moving mold spring plate 9, penetrating the mold core 10 and extending beyond the end face of the mold core 10. Both the moving mold pad 4 and the first color core puller 12, and both the moving mold pad 4 and the second color core puller 11, are provided with core puller seats 14 that are respectively inserted through the first color moving mold spring plate 3 and the second color moving mold spring plate 9. The core puller seats 14 are fixed to the moving mold pad 4 with snap-fit ​​screws. Both the core puller seats 14 and the first color core puller 12, and both the core puller seats 14 and the second color core puller 11, are provided with core puller T-shaped guide rails 13 that are respectively fixed to the first color core puller 12 and the second color core puller 11 with screws. Both sides of the core puller T-shaped guide rails 13 are provided with core puller seat guide rails 15 to guide and limit the core puller seats 14.

[0027] Working principle: Phase 1: Mold Closure and Injection Molding. The mold is fully closed, and the locking mechanism 2 is in the locked state, firmly connecting the moving mold plate 4 to the first-color moving mold spring plate 3 and the second-color moving mold spring plate 9. At this time, the first-color core pull 12 and the second-color core pull 11 are both in the inserted state, forming a complete cavity together with the mold core 10. The injection molding machine performs the first injection (first-color material), molding a portion of the product. Then, the mold rotates or switches, performing the second injection (second-color material), wrapping or combining with the first-color material to form the final two-color product.

[0028] Phase Two: Mold Opening and Core Pulling. Mold Opening Begins: The injection molding machine moves the moving mold part (including the moving mold fixing plate 6, moving mold pad 4, etc.) backward. The fixed mold plate 1 separates from the moving mold part.

[0029] Synchronous movement: In the initial stage of mold opening, due to the locking action of the latch 2, the moving mold pad 4, the first color moving mold spring plate 3, and the second color moving mold spring plate 9 move backward synchronously as a whole. At this time, the first color core pull 12 and the second color core pull 11 have not yet moved, and the product is still encased in the mold core.

[0030] Locking mechanism opens: When the mold opens to the preset distance, the mechanical structure of the locking mechanism 2 is triggered, and it unlocks instantly.

[0031] Relative displacement occurs: After unlocking, the moving mold pad 4 continues to move backward with the injection molding machine, while the first color moving mold spring plate 3 and the second color moving mold spring plate 9 stop moving because they have lost their constraints.

[0032] Core pulling is performed as follows: The backward movement of the moving mold pad 4, through the core pulling seat 14 fixed thereon, forces the first-color moving mold spring plate 3 and the second-color moving mold spring plate 9, which are still in their original positions, to move forward relative to each other (relative to the moving mold pad 4). Since the first-color core pull 12 and the second-color core pull 11 are fixed on the spring plate, this relative movement is transformed into a linear backward movement of the core pull, allowing it to smoothly disengage from the product's undercut. During this process, the core pulling T-shaped guide rail 13 slides smoothly under the guidance of the core pulling seat guide rail 15.

[0033] Phase 3: Product Ejection. The mold opening stroke ends, and the core-pulling action is completed. The ejector roller of the injection molding machine pushes the ejection mechanism below the moving mold fixing plate 6. The ejection mechanism pushes the first-color ejector plate 7 or the second-color ejector plate 8 forward. The ejector plate, along with its eight ejector pins 16, ejects the molded two-color product from the mold core 10. The robot or worker removes the product, and the mold is ready for the next mold closing.

[0034] In summary, the core-pulling structure of this dual-color injection mold for automotive taillights features a compact structure, good operational stability, and long service life. The internal core-pulling structure is stable, has low processing costs, and is easy to install. Reducing the number of core-pulling actions avoids product damage, ensures product quality, significantly improves the pass rate, and promotes production.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A spring-loaded core-pulling structure for a dual-color injection mold of automotive taillights, characterized in that: The system includes a moving mold fixing plate (6), a fixed template (1) on the moving mold fixing plate (6), a moving mold pad (4) between the fixed template (1) and the moving mold fixing plate (6), a first color moving mold spring plate (3) and a second color moving mold spring plate (9) that are distributed in a mirror symmetrical manner between the moving mold pad plate (4) and the fixed template (1), a mold core (10) between the first color moving mold spring plate (3) and the fixed template (1) and between the second color moving mold spring plate (9) and the fixed template (1), a first color core puller (12) that penetrates the mold core (10) and extends out of the end face of the mold core (10) on the first color moving mold spring plate (3), and a second color core puller (11) that penetrates the mold core (10) and extends out of the end face of the mold core (10) on the second color moving mold spring plate (9).

2. The spring plate core-pulling structure for a dual-color injection mold of automotive taillights according to claim 1, characterized in that: The moving mold pad (4) and the first color core puller (12) are provided with core puller seats (14) that are inserted through the first color moving mold spring plate (3) and the second color moving mold spring plate (9) respectively. The core puller seats (14) are fixed to the moving mold pad (4) with snap-fit ​​screws.

3. The spring plate core-pulling structure for a dual-color injection mold of automotive taillights according to claim 2, characterized in that: The core-pulling seat (14) and the first color core-pulling seat (12) are provided with core-pulling T-shaped guide rails (13) that are respectively screwed and fixed to the first color core-pulling seat (12) and the second color core-pulling seat (14) and the second color core-pulling seat (11).

4. The spring plate core-pulling structure for a dual-color injection mold of automotive taillights according to claim 3, characterized in that: Both sides of the aforementioned core-pulling T-shaped guide rail (13) are provided with core-pulling seat guide rails (15) for guiding and limiting the core-pulling seat (14).

5. The spring plate core-pulling structure for a dual-color injection mold of automotive taillights according to claim 1, characterized in that: The moving mold pad (4) and the moving mold fixing plate (6) are respectively provided with a first color ejector plate (7) and a second color ejector plate (8). The four corners of the moving mold pad (4) are provided with mold feet (5) between the moving mold fixing plate (6) and the first color ejector plate (7) and the second color ejector plate (8). The lower end of the moving mold fixing plate (6) is provided with a plurality of ejector pins (16) that penetrate the moving mold fixing plate (6) and are respectively connected and fixed to the first color ejector plate (7) and the second color ejector plate (8).

6. The spring plate core-pulling structure for a dual-color injection mold of automotive taillights according to claim 1, characterized in that: The first color moving mold plate (3) and the fixed template (1) are both provided with a fastener (2) fixed on the moving mold pad (4) between their sides and the fixed template (1), and the second color moving mold plate (9) and the fixed template (1). The moving mold pad (4) is separated from the first color moving mold plate (3) and the second color moving mold plate (9) by opening the fastener (2).

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