An injection mold for automotive lamp housings

Abstract

This utility model discloses an injection mold for automotive lamp housings, comprising: a rear mold assembly, which includes a rear template and a second lateral core-pulling mechanism; the second lateral core-pulling mechanism includes a second slider, a tunnel slider, and a forming slider; the forming slider slides relative to the second slider along the mold opening direction; the forming slider and the second slider are used to jointly form the retaining edge on the lamp housing plastic part; during the mold opening process, the tunnel slider first moves laterally a predetermined distance, causing the forming slider to disengage from the retaining edge, and then continues to drive the second slider and the forming slider to move laterally synchronously; and a front mold assembly, which cooperates with the rear mold assembly to close the mold and form the cavity of the lamp housing plastic part. This utility model provides an injection mold for automotive lamp housings, which achieves step-by-step demolding of the forming slider through the leading movement of the tunnel slider, avoiding interference between the retaining edge and the lateral undercut structure, ensuring accurate molding of complex lamp housing structures, improving mold adaptability and production efficiency, and is suitable for diverse automotive lamp housing injection molding processes.

Description

Technical Field

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

[0002] In the automobile manufacturing process, the headlight housing is a key component in terms of both appearance and function, and its structural design directly affects assembly precision and product quality.

[0003] In existing technologies, such as Figure 1 As shown, automotive headlight housings typically include a housing for mounting the light source and reflector structure. The rear of the housing extends laterally to form a connecting cantilever for fixed connection to the vehicle body structure. To enhance the structural rigidity of the housing and improve sealing, one edge of the housing extends outward to form a retaining edge. This retaining edge forms a vertical gap with the housing surface, requiring molding using a convex-concave structure. However, to meet functional and spatial requirements, a lateral undercut structure is also provided on the opposite side of the housing. This undercut is located at the bottom of the retaining edge, interfering with the retaining edge structure and preventing demolding using traditional parting methods.

[0004] Conventional side-pulling mechanisms are limited by space and pulling direction, making it difficult to mold such complex structures simultaneously without damaging structural integrity. Therefore, existing mold designs cannot meet the requirements for integrated molding of lamp housing structures. Summary of the Invention

[0005] The technical problem to be solved by this utility model is: to address the problems of interference between the side buckle and the edge structure in the existing automotive lamp housing structure, and the inability of conventional mold structure to achieve one-piece molding, so as to provide an automotive lamp housing injection mold with optimized structure and reliable core pulling, so as to achieve efficient and complete molding of lamp housing plastic parts with complex structure.

[0006] The technical solution adopted by this utility model is: to provide an injection mold for an automotive lamp housing, comprising:

[0007] The rear mold assembly includes a rear template and a second lateral core-pulling mechanism. The second lateral core-pulling mechanism includes a second slider slidably disposed on the rear template, a tunnel slider slidably disposed on the second slider, and a molding slider that is drivenly engaged with the tunnel slider. The molding slider slides relative to the second slider along the mold opening direction. The molding slider and the second slider are used to jointly mold the edge on the lamp housing plastic part.

[0008] During the mold opening process, the tunnel slider first moves a predetermined distance laterally, causing the forming slider to detach from the baffle on the lamp housing. Then, it continues to drive the second slider and the forming slider to move laterally synchronously, thus achieving complete demolding of the lateral undercut structure.

[0009] The front mold assembly, together with the rear mold assembly, is closed to form the complete cavity of the lamp housing plastic part.

[0010] Through the above structural design, and by employing a "step-by-step demolding" core-pulling method, the tunnel slider's pioneering movement allows the molding slider to detach from the lamp housing's retaining edge structure first along the mold opening direction. This effectively avoids interference problems caused by the overlap of the retaining edge and the side undercut structure. It achieves precise molding of the lamp housing's retaining edge and undercut structure, avoiding the demolding problems caused by structural interference in traditional molds. This improves mold adaptability and production efficiency, making it suitable for injection molding processes of automotive lamp housings with complex side structures, and possessing good versatility and engineering application value.

[0011] According to one embodiment of this utility model, one of the tunnel slider and the forming slider is provided with an inclined dovetail block, and the other is provided with an inclined dovetail groove that slides in cooperation with it. By the inclined cooperation between the inclined dovetail block and the dovetail groove, the horizontal movement of the tunnel slider is changed to the vertical movement of the forming slider, allowing the forming slider to be pre-disengaged from the formed retaining edge.

[0012] According to one embodiment of this utility model, the tunnel slider is provided with an oblique guide hole, and the front mold assembly is provided with an oblique guide post at a corresponding position. The cooperation between the oblique guide post and the oblique guide hole enables automatic guidance of the tunnel slider during the mold opening process, ensuring the accuracy of the slider's movement trajectory.

[0013] According to one embodiment of this utility model, the second slider is provided with a positioning block, and the bottom of the tunnel slider is provided with a positioning groove that cooperates with it. When the tunnel slider moves laterally to a predetermined position, the positioning groove engages with the positioning block for positioning. This structure can achieve automatic positioning when the core is pulled into place, preventing demolding errors caused by slider displacement, and improving the accuracy and repeatability of mold operation.

[0014] According to one embodiment of the present invention, the rear mold assembly further includes a first lateral core-pulling mechanism, which is disposed on the rear mold plate.

[0015] According to one embodiment of the present invention, the first lateral core-pulling mechanism includes a first slider, which is used to form a connecting cantilever on the lamp housing plastic part.

[0016] According to one embodiment of the present invention, the first lateral core-pulling mechanism further includes a core-pulling cylinder for driving the first slider.

[0017] According to one embodiment of the present invention, the first slider and the second slider are arranged perpendicularly.

[0018] According to one embodiment of this utility model, the second slider is provided with a vertical guide groove, which is arranged in a direction parallel to the mold opening direction. By providing the vertical guide groove, the forming slider is guided to move stably in a preset direction during the core pulling process, thus avoiding core pulling errors.

[0019] According to one embodiment of the present invention, the forming slider is provided with a vertical guide block at the position corresponding to the vertical guide groove, and the vertical guide block slides in cooperation with the vertical guide groove. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of the lamp housing plastic part in the embodiment of this utility model.

[0022] Figure 2 This is a perspective view of the rear mold assembly in an embodiment of this utility model.

[0023] Figure 3 This is a perspective view of the first lateral core-pulling mechanism, the second lateral core-pulling mechanism, and the lamp housing plastic part in the embodiment of this utility model.

[0024] Figure 4 This is an exploded view of the first lateral core-pulling mechanism, the second lateral core-pulling mechanism, and the lamp housing plastic part in the embodiment of this utility model.

[0025] Figure 5 This is a schematic diagram of the second lateral core-pulling mechanism in an embodiment of the present invention.

[0026] Figure 6 This is a top view of the second lateral core-pulling mechanism in an embodiment of the present invention.

[0027] Figure 7 This is a cross-sectional view of the second lateral core-pulling mechanism in the embodiment of this utility model during mold closing.

[0028] Figure 8 This is a cross-sectional view of the second lateral core-pulling mechanism in this embodiment of the present invention after mold opening.

[0029] Figure 9 This is a perspective view of the first lateral core-pulling mechanism in an embodiment of the present utility model.

[0030] Figure 10 This is a perspective view of the front mold assembly in an embodiment of this utility model.

[0031] Explanation of the labels in the diagram:

[0032] 10. Lamp housing plastic parts; 20. Rear mold assembly; 30. Front mold assembly;

[0033] 11. Housing; 12. Edge retainer; 13. Lateral overhang; 14. Connecting cantilever;

[0034] 21. Rear template; 22. First lateral core-pulling mechanism; 23. Second lateral core-pulling mechanism;

[0035] 221. Core-pulling cylinder; 222. First slider;

[0036] 231. Second slider; 232. Tunnel slider; 233. Forming slider; 234. Positioning block;

[0037] 231a, First forming part; 231b, Vertical guide groove;

[0038] 232a, oblique guide hole; 232b, dovetail block; 232c, positioning groove;

[0039] 233a, Second forming section; 233b, Dovetail groove; 233c, Vertical guide block;

[0040] 31. Front template; 32. Angled guide post. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Example 1

[0042] like Figure 1 As shown, in this embodiment, the lamp housing plastic part 10 includes a housing 11, one side edge of which is provided with a retaining edge 12 and a lateral buckle 13. The lateral buckle 13 is located at the lower part of the retaining edge 12, and the rear part of the housing 11 is provided with a connecting cantilever 14.

[0043] like Figure 2-10 As shown, this embodiment discloses an injection mold for an automotive lamp housing, including a front mold assembly 30 and a rear mold assembly 20. The front mold assembly 30 and the rear mold assembly 20 are closed to form a complete cavity structure for the lamp housing plastic part 10, and the plastic part can be demolded after the mold is opened. The rear mold assembly 20 is located on the rear side of the mold and includes a rear template 21 and a core-pulling structure mounted thereon. It is mainly used to realize the molding and demolding functions of lateral or complex structures such as the flange 12 and the connecting cantilever 14 in the structure of the lamp housing plastic part 10.

[0044] Specifically, the rear mold assembly 20 is provided with a second lateral core-pulling mechanism 23, which includes a second slider 231 slidably disposed on the rear mold plate 21. The second slider 231 can slide along the lateral guide rail and moves laterally in a direction perpendicular to the mold opening direction when the mold is opened, thereby realizing the core-pulling function of the lamp housing plastic part 10 with the lateral undercut 13 or side wall structure.

[0045] Furthermore, a tunnel slider 232 is slidably mounted on the second slider 231. The tunnel slider 232 can slide in a lateral direction consistent with the sliding direction of the second slider 231 and moves first during the mold opening process.

[0046] Furthermore, the molding slider 233 is slidably mounted on the second slider 231 and is connected to the tunnel slider 232 via an inclined structure, allowing the molding slider 233 to slide along the mold opening direction during the movement of the tunnel slider 232. The inner side of the second slider 231 has a first molding part 231a, and the inner side of the molding slider 233 has a second molding part 233a. The combination of the first molding part 231a, the second molding part 233a, and the rear template 21 forms part of the cavity. Initially, when the mold opens, the tunnel slider 232 moves laterally first, using the inclined structure to disengage the molding slider 233 from the retaining edge 12 structure on the lamp housing plastic part 10, thus preventing damage to the plastic part due to direct core pulling. After the molding slider 233 disengages from the retaining edge 12, the tunnel slider 232 continues to move laterally, thereby causing the second slider 231 and the molding slider 233 to move laterally synchronously, completing the demolding process of the lateral undercut 13 portion.

[0047] Furthermore, the oblique structure between the tunnel slider 232 and the forming slider 233 adopts a dovetail block 232b and dovetail groove 233b mating structure. Specifically, the tunnel slider 232 is provided with an oblique dovetail groove 233b, and the forming slider 233 is provided with a mating dovetail block 232b; the two are in a sliding fit connection. Through the guiding function of the dovetail groove 233b, when the tunnel slider 232 moves laterally, it can stably and reliably drive the forming slider 233 to slide along the mold opening direction, effectively preventing sliding deviation or jamming.

[0048] Furthermore, to ensure that the tunnel slider 232 moves along a predetermined trajectory during mold opening, an inclined guide hole 232a is provided in its body, and an inclined guide post 32 is provided on the front mold assembly 30. The inclined guide post 32 is inserted into the inclined guide hole 232a when the mold is closed, and pushes the tunnel slider 232 to move along the designed trajectory when the mold is opened. This structure achieves passive drive through the mold opening and closing action, without the need for an additional power device, thus improving the coordination and automation of the mold action.

[0049] Furthermore, to ensure that the tunnel slider 232 can be precisely positioned at a set location during the mold opening process, a positioning groove 232c is provided at its bottom, which cooperates with the positioning block 234 embedded on the second slider 231. When the tunnel slider 232 moves into position, the positioning groove 232c and the positioning block 234 engage, thereby mechanically limiting and locking the tunnel slider 232, thus avoiding demolding failure or structural interference due to mold inertia or inaccurate resetting.

[0050] Furthermore, the rear mold assembly 20 also includes a first lateral core-pulling mechanism 22, which is disposed on the rear mold plate 21 and is mainly used to mold lateral extension components such as the connecting cantilever 14 located outside the flange 12 structure on the lamp housing plastic part 10.

[0051] Furthermore, the first lateral core-pulling mechanism 22 includes a first slider 222, which is arranged in a direction perpendicular to the second slider 231 to avoid interference or overlap between the two slider structures during the core-pulling process. The first slider 222 is used to combine with the rear template 21 and the front template 31 to form part of the cavity when the mold is closed, and to laterally pull out the connecting cantilever 14 part of the lamp housing plastic part 10 after the mold is opened.

[0052] Furthermore, the first lateral core-pulling mechanism 22 also includes a core-pulling cylinder 221, which is connected to the first slider 222 and is used to drive the first slider 222 to perform a core-pulling action in a set direction.

[0053] Furthermore, to further ensure stable sliding of the molding slider 233 during the mold opening process, the second slider 231 body is provided with a vertical guide groove 231b, which is arranged in a direction parallel to the mold opening direction. Alternatively, the structural parts connected to it can slide in the guide groove to restrict its movement direction and avoid unstable or skewed sliding.

[0054] Furthermore, the forming slider 233 is provided with a vertical guide block 233c at a position corresponding to the vertical guide groove 231b. The vertical guide block 233c is inserted into the vertical guide groove 231b and slides with it, so as to achieve precise control of the linkage movement of the tunnel slider 232 and the forming slider 233.

[0055] In this embodiment, the mold operates as follows:

[0056] After the mold has been injection molded and cooled to solidify, follow these steps to open the mold and remove the core:

[0057] First, the front mold assembly 30 and the rear mold assembly 20 separate along the mold opening direction. The front mold assembly 30 moves forward, so that the lamp housing plastic part 10, together with the housing 11, the flange 12, the side buckle 13 and the connecting cantilever 14 formed thereon, are retained on one side of the rear mold assembly 20.

[0058] During the separation of the front mold assembly 30 and the rear mold assembly 20, the inclined guide post 32 on the front mold assembly 30 inserts into and slides out of the inclined guide hole 232a of the tunnel slider 232. During the withdrawal process, the inclined guide post 32 drives the tunnel slider 232 to move along a preset lateral direction. Since the tunnel slider 232 and the molding slider 233 are linked by an inclined dovetail structure, the lateral movement of the tunnel slider 232 will simultaneously drive the molding slider 233 to slide relative to the second slider 231 along the mold opening direction, so that the molding slider 233 gradually withdraws from the baffle 12 structure on the lamp housing plastic part 10, completing the local demolding action of the baffle 12 area.

[0059] As the tunnel slider 232 continues to move, after the forming slider 233 completely disengages from the retaining edge 12 structure, the tunnel slider 232 continues to push the second slider 231 and the forming slider 233 as a whole to move laterally, achieving complete demolding of the entire lateral undercut 13. At this time, the retaining edge 12 and the lateral undercut 13 at the bottom of the lamp housing plastic part 10 can be demolded smoothly without interference or structural damage. During this process, when the tunnel slider 232 moves laterally to the predetermined position, the positioning groove 232c at its bottom engages and locks with the positioning block 234 on the second slider 231, keeping the tunnel slider 232 stable at the lateral endpoint position.

[0060] The first lateral core-pulling mechanism 22, which operates independently of the second lateral core-pulling mechanism 23, is driven by a hydraulic control system to activate its connected core-pulling cylinder 221. This cylinder pushes the first slider 222 to move laterally in a direction perpendicular to the second slider 231, thus completing the core-pulling and demolding of the connecting cantilever 14 structure. Since the first slider 222 and the second slider 231 are arranged perpendicularly, their core-pulling actions do not interfere with each other and can be performed simultaneously or sequentially, effectively improving the demolding efficiency of the mold.

[0061] Finally, after all the sliders have completed the core pulling, the molded lamp housing plastic part 10 is removed by a robot or manually, and the mold components are reset to prepare for the next injection molding cycle.

[0062] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An injection mold for an automotive lamp housing, characterized in that, include: The rear mold assembly includes a rear template and a second lateral core-pulling mechanism. The second lateral core-pulling mechanism includes a second slider slidably disposed on the rear template, a tunnel slider slidably disposed on the second slider, and a molding slider that is drivenly engaged with the tunnel slider. The molding slider slides relative to the second slider along the mold opening direction. The molding slider and the second slider are used to jointly mold the edge on the lamp housing plastic part. During the mold opening process, the tunnel slider first moves a predetermined distance laterally, causing the forming slider to disengage from the stop, and then continues to drive the second slider to move laterally synchronously with the forming slider. The front mold assembly, together with the rear mold assembly, is molded to form the cavity of the lamp housing plastic part.

2. The injection mold for an automotive lamp housing according to claim 1, wherein: One of the tunnel slider and the forming slider is provided with an oblique dovetail block, and the other is provided with an oblique dovetail groove that slides with it.

3. The injection mold for an automotive lamp housing of claim 2, wherein: The tunnel slider is provided with an oblique guide hole, and the front mold assembly is provided with an oblique guide post at the corresponding position.

4. The injection mold for an automotive lamp housing of claim 1, wherein: The second slider is provided with a positioning block, and the bottom of the tunnel slider is provided with a positioning groove that cooperates with it. When the tunnel slider moves laterally to a predetermined position, the positioning groove engages with the positioning block for positioning.

5. The automotive lamp housing injection mold according to claim 1, characterized in that: The rear mold assembly further includes a first lateral core-pulling mechanism, which is disposed on the rear mold plate.

6. The injection mold for an automotive lamp housing of claim 5, wherein: The first lateral core-pulling mechanism includes a first slider, which is used to form the connecting cantilever on the lamp housing plastic part.

7. The injection mold for an automotive lamp housing of claim 6, wherein: The first lateral core-pulling mechanism further includes a core-pulling cylinder for driving the first slider.

8. The automotive lamp housing injection mold of claim 6, wherein: The first slider and the second slider are arranged perpendicularly.

9. The automotive lamp housing injection mold of claim 1, wherein: The second slider is provided with a vertical guide groove, which is arranged in a direction parallel to the mold opening direction.

10. The automotive lamp housing injection mold of claim 9, wherein: The forming slider has a vertical guide block at the position corresponding to the vertical guide groove, and the vertical guide block slides in conjunction with the vertical guide groove.

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