A linkage core-pulling secondary forming mold for a vehicle lamp plastic part

Abstract

This invention discloses a secondary molding mold for automotive headlight plastic parts with a linked core-pulling mechanism. It is used to mold a light guide in a primary mold and a decorative shell around the light guide in a secondary mold. The mold includes a primary mold assembly and a secondary mold assembly. The primary mold assembly includes multiple mutually closed mold core units and a primary mold component. An auxiliary core-separating component is provided between the mold core units. This component is configured to separate at least two mold core units in response to a mold-separating action. The secondary mold assembly includes a secondary component. The secondary component includes a third lower molding block, which is configured in the secondary mold to block the light guide end and the decorative shell end. Through a core-pulling structure common to both the primary and secondary molds, a mechanical linkage design between the two molds is achieved, enabling efficient, reliable, and non-destructive molding and demolding of the complex undercut structures on the light guide and decorative shell.

Description

Technical Field

[0001] This invention relates to the field of automotive parts molding equipment technology, specifically to a secondary molding mold for automotive headlight plastic parts with a linked core-pulling mechanism. Background Technology

[0002] Currently, with the rapid development of automotive lighting technology, headlight design is increasingly evolving towards functional integration and aesthetic convergence. Headlight components, especially thick-walled light guides and their outer shells, are becoming increasingly complex in structure. To meet requirements for assembly stability, heat dissipation, or to achieve specific optical and aesthetic effects, the design of inverted structures (such as lateral snaps, internal grooves, and irregularly shaped locking parts) on the light guide body or its outer shell has become a common requirement. While these inverted structures enhance product functionality, they also present significant challenges to injection molding, especially secondary injection molding processes.

[0003] In traditional secondary molding dies, the common solution for undercut structures on light guides or decorative shells is to set up a separate lateral core-pulling mechanism. This type of mechanism needs to act before or during mold opening after the primary or secondary molding process to detach from the undercut area, ensuring smooth demolding. However, in the secondary molding of thick-walled light guides, simply introducing a separate core-pulling mechanism will struggle to resolve interference and spatial conflicts between mechanisms. First, the light guide itself is already a thick-walled component, especially since the internal structure of the primary molding die is already very compact. In this context, adding a separate core-pulling mechanism for the undercut on the light guide can easily lead to congestion within the mold, causing motion interference, significantly increasing the difficulty of mold design, processing, and assembly, and reducing reliability. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a secondary molding mold for automotive headlight plastic parts with linked core pulling.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] A secondary molding die for automotive headlight plastic parts, used to mold a light guide in a primary molding process and to mold a decorative shell around the light guide in a secondary molding process, comprising:

[0007] A primary mold module includes multiple mold core units and a primary molding assembly that are interlocked with each other. An auxiliary core-separating assembly is provided between the mold core units. The auxiliary core-separating assembly is configured to separate at least two mold core units along the joining direction in response to a mold-separating action. The primary molding assembly includes a first lower molding block and a second lower molding block forming the end shell connecting end of the light guide. The shell connecting end at one end is configured to form a mechanical interlock with the shell during secondary molding.

[0008] A secondary mold module, the secondary mold module including a secondary component, the secondary component including a third lower molding block, the third lower molding block being configured in the secondary mold to block the light guide end and the end of the decorative shell at another decorative shell connecting end;

[0009] The moving module includes a moving mold core, a slider slidably disposed on the moving mold core, and a first core-pulling assembly and a second core-pulling assembly disposed opposite to each other on the moving mold core;

[0010] In the primary type, the slider forms a side connection portion of the decorative shell on one side of the light guide and remains engaged with the side connection portion of the decorative shell. In the secondary type, the slider is moved away from the side of the light guide.

[0011] The first core-pulling assembly includes a first core-pulling slider, which has a primary molding surface that supports and shapes the light guide in a primary molding process, and a secondary molding surface that shapes the first undercut portion on the decorative shell in a secondary molding process; the second core-pulling assembly includes a second core-pulling slider, which is configured to shape a second undercut portion on the decorative shell that is opposite to the first undercut portion in a secondary molding process.

[0012] Furthermore, the moving mold core and the primary mold module form a primary cavity, or the moving mold core and the secondary mold module form a secondary cavity. The first core-pulling assembly includes a core-pulling cylinder and an inclined guide seat disposed on the actuating end of the core-pulling cylinder. The inclined guide seat is provided with a first variable diameter slide. The first core-pulling slider is slidably disposed on the first variable diameter slide and is held in the extended position during primary and secondary molding.

[0013] The primary molding surface is formed at the top of the first core-pulling slider and together with the moving mold core and the primary mold fixed module, forms the sealing surface of the primary cavity. The secondary molding surface is formed at the end face of the first core-pulling slider and together with the moving mold core and the secondary mold fixed module, forms the sealing surface of the secondary cavity.

[0014] Furthermore, the secondary mold module also includes a secondary mold core and an inclined guide block fixed on the secondary mold core. An inclined pull rod is provided inside the inclined guide block, and a guide channel matching the inclined pull rod is provided inside the second core-pulling slider.

[0015] The second core-pulling slider is disposed relative to the secondary molding surface and located below the primary molding surface, and the second core-pulling slider is spaced outside the primary cavity in the primary mold.

[0016] Furthermore, the fixed mold core unit includes an inner fixed core and an outer fixed core that are joined together at the front and rear ends, and a molding top block that passes through the inner fixed core and the outer fixed core.

[0017] The forming surface of the slider is embedded in the inner core, and the primary forming surface is obliquely overlapped between the outer core and the moving core. The outer core has a fixed side forming surface that is inserted into the primary cavity. The fixed side forming surface is used to form a three-dimensional textured light-emitting surface on the side of the light guide. The auxiliary core-splitting assembly is set on the joint surface of the inner core and is located on the opposite side of the three-dimensional textured light-emitting surface.

[0018] Furthermore, an ejector spring is provided between the first lower molding block and the outer core. The ejector spring is configured to apply a force to the first lower molding block to move it away from the primary cavity when the mold is opened. A first slide rail is provided on the outer core. The first lower molding block is slidably connected to the first slide rail. The extension direction of the first slide rail is configured to guide the first lower molding block to move along the demolding direction of the shell connection end.

[0019] The bottom of the second lower molding block is provided with a first hook, and the moving mold core is provided with a second hook that cooperates with the first hook. The second hook is configured to pull the second lower molding block to move when the mold is opened so as to release its constraint on the connecting end of the decorative shell.

[0020] Furthermore, the inner core and the outer core are respectively joined at both ends, the forming top block is located between the two joint surfaces of the inner core and the outer core, the auxiliary core-separating assembly includes a butterfly spring disposed on the joint surface of the inner core, the first lower forming block and the second lower forming block are respectively connected to the joint surfaces of the inner core and the outer core, and the third lower forming block is embedded in the secondary mold core.

[0021] Furthermore, the primary mold module is provided with a mold ejection mechanism, which includes a movable top plate and a plurality of mold ejection units connected to the top plate. The top plate is connected to the molding top block and is configured to drive the top plate and the molding top block connected thereto to move in the demolding direction in response to the mold opening action of the primary mold module and the moving module, so as to separate the light guide from the mold core unit.

[0022] Furthermore, the primary molding module includes a primary molding template group, the top plate is accommodated and movable within the primary molding template group, and the top plate is connected to the molding top block by a top rod;

[0023] The fixed mold ejection unit includes an ejector cylinder fixed on the primary mold platen assembly, an ejection spring abutting between the primary mold platen assembly and the top plate, and a tie rod assembly connecting the moving mold assembly and the top plate. The actuating end of the ejector cylinder is connected to the top plate. The ejection spring applies a force to the top plate towards the moving mold core. The tie rod assembly pulls the top plate towards the moving mold core at least during the mold opening action.

[0024] Furthermore, the second lower molding block is provided with a first connecting molding portion that matches the open end of the light guide, and the third lower molding block is provided with a second connecting molding portion that matches the open end of the light guide and the end of the decorative shell, wherein the open end of the light guide is recessed into the second connecting molding portion.

[0025] Furthermore, the moving mold core is provided with a connecting seat arranged along the length direction of the light guide in the middle. The connecting seat abuts against the primary mold module and the secondary mold core in the closed state and cancels the mold opening gap.

[0026] The first and second core-pulling sliders are arranged on both sides of the decorative shell corresponding to the light guide along the width direction of the light guide. The core-pulling cylinder and the inclined guide seat are arranged at the lower part of the joint seat, and the slider is arranged in the middle of the light guide.

[0027] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention achieves high integration between the primary mold fixed module and the moving module, and the primary mold fixed module and the moving module cooperate to form a primary cavity. At this time, the main feature part of the thick-walled light guide is formed on the fixed mold part in the primary cavity. Only the bottom light-transmitting surface of the thick-walled light guide is located on the surface of the moving mold core, so as to facilitate the removal of the light guide from the moving mold core. In the primary mold, by setting an auxiliary core-separating component between multiple fixed mold core units, the fixed mold core units and the thick-walled light guide are separated during the primary mold opening. The clamping force between the sidewalls of the light guide is such that, at the same time, a first lower molding block and a second lower molding block are arranged in the primary cavity corresponding to the two ends of the light guide to form the end features of the light guide. The first lower molding block and the second lower molding block are both arranged on the primary mold fixed module, which separates from the end of the light guide during the primary mold parting. Meanwhile, at least one of the first lower molding block and the second lower molding block, as well as the slider located in the middle of the primary cavity, form a shell connecting structure on the non-transparent surface of the light guide so that the light guide and the shell part of the secondary injection molding can form a reliable fit.

[0028] When the light guide is switched from the primary mold to the secondary mold, the moving mold core moves directly to carry the light guide to face the secondary mold module. At this time, the slider remains in the primary mold position and cooperates with the side connection part of the trim shell on the light guide. Meanwhile, the first core-pulling assembly and the slider always remain in the extended position in both the primary and secondary molds. At this time, the lower slider and the upper first core-pulling slider respectively provide a holding function for the light guide, ensuring the connection between the light guide and the trim shell. This effectively improves the overall structural stability and optical performance of the automotive headlight plastic parts, avoids defects such as displacement, bubbles or poor bonding during the secondary molding process, and ensures the dimensional accuracy and appearance consistency of the plastic parts.

[0029] In the secondary molding process, the first and second undercut portions on the decorative shell are formed together by the first and second core-pulling components. The slider retracts and moves away from the secondary cavity under the action of the mold closing action of the secondary mold core. At the same time, the third lower molding block blocks the open end of the light guide and the decorative shell. Under the premise of ensuring the connection end of the decorative shell at the open end of the light guide, the flow of molten material between the light guide and the decorative shell is effectively prevented.

[0030] This invention uses a combination of a primary mold module, a secondary mold module, and a moving module to form thick-walled light guides and decorative shells. It deeply integrates and reuses the undercut core-pulling mechanism with existing structures for demolding and positioning thick-walled parts. Through the core-pulling structure common to both primary and secondary molding, it achieves mechanical linkage between the two processes. This makes the undercut core-pulling action no longer an isolated, external process, but an organic link in the entire secondary molding demolding and parting sequence. Thus, without significantly increasing the complexity of the mold or control costs, it achieves efficient, reliable, and non-destructive molding and demolding of complex undercut structures on light guides and decorative shells. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the one-time molding fixed mold module and the moving mold module of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the secondary fixed mold module and the moving module of the present invention;

[0033] Figure 3 This is a cross-sectional view of the primary cavity of the present invention;

[0034] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0035] Figure 5 This is a cross-sectional view of the secondary cavity of the present invention;

[0036] Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle;

[0037] Figure 7 This is a cross-sectional view of the coupling seat in the primary form of the present invention;

[0038] Figure 8 This is a schematic diagram of the overall structure of the fixed mold core unit of the present invention;

[0039] Figure 9 This is a schematic diagram of the structure after the primary formwork assembly of the present invention has been removed;

[0040] Figure 10 This is a schematic diagram of the structure of the primary component, the secondary component, the first core-pulling component, and the second core-pulling component of the present invention;

[0041] Figure 11 This is a cross-sectional view of the first core-pulling assembly and the second core-pulling assembly in the primary cavity of the present invention;

[0042] Figure 12 This is a cross-sectional view of the first core-pulling assembly and the second core-pulling assembly in the secondary cavity of the present invention;

[0043] Figure 13 This is an exploded view of the fixed mold core unit of the present invention;

[0044] Figure 14 This is an exploded view of the fixed mold core unit of the present invention from another angle;

[0045] Figure 15 This is a cross-sectional view of the auxiliary core-separating assembly between the inner core and the molding top block of the present invention.

[0046] Figure 16 This is a cross-sectional view of the auxiliary core-splitting assembly between the inner and outer cores of the present invention.

[0047] Figure 17 This is a schematic diagram of the structure of the first lower molding block of the present invention;

[0048] Figure 18 This is a cross-sectional view of the first lower molding block of the present invention;

[0049] Figure 19 This is a cross-sectional view of the second lower molding block of the present invention;

[0050] Figure 20 For the present invention Figure 19 Enlarged view of point D in the middle;

[0051] Figure 21 This is a schematic diagram of the structure of the third lower molding block of the present invention;

[0052] Figure 22 This is a cross-sectional view of the third lower molding block of the present invention;

[0053] Figure 23 This is a cross-sectional view of the fixed mold core unit of the present invention;

[0054] Figure 24 For the present invention Figure 23 Enlarged view of point C in the middle;

[0055] Figure 25 This is an exploded view of the slider of the present invention;

[0056] Figure 26 This is a schematic diagram of the structure of the push rod in the primary form of the present invention;

[0057] Figure 27 For the present invention Figure 26 Enlarged view at point F;

[0058] Figure 28 For the present invention Figure 1 Enlarged view at point E in the middle;

[0059] In the diagram: 1. One-time molding module; 11. One-time molding component; 111. First lower molding block; 112. Second lower molding block; 1121. First connecting molding part; 1122. Angled channel; 1123. Second slide rail; 1124. Third limiting protrusion; 1125. First hook; 113. Ejector spring; 114. Countersunk hole; 115. Ejector push block; 116. First slide groove; 117. Limiting groove; 118. Angled guide rod; 1181. Second limiting protrusion; 12. Auxiliary core splitting component; 121. Butterfly spring; 122. Core splitting push block; 123. Guide screw; 1231. Cylindrical part; 124. Movement clearance; 13. Inner core; 131. First protrusion; 132. Core splitting. 133. Jointing surface; 14. Outer core; 141. Fixed side forming surface; 142. First slide rail; 1421. First limiting protrusion; 15. Forming top block; 151. First limiting step; 16. One-time forming template assembly; 161. Activity space; 162. Offset gap; 17. Ejection channel; 171. Ejection gap; 172. Second limiting step; 2. Moving mold assembly; 21. Moving mold core; 211. Sliding groove; 212. Slide block; 213. T-slot; 22. Slider; 221. Mating groove; 2211. First groove wall; 2212. Second groove wall; 222. Forming side protrusion; 2221. Concave forming part; 2222. Pressing surface; 223. Supporting surface; 2 24. T-shaped guide section; 225. Positioning spring; 226. Sliding protrusion; 227. Primary positioning groove; 228. Secondary positioning groove; 229. Vent hole; 23. First core-pulling assembly; 231. First core-pulling slider; 2311. Primary forming surface; 2312. Secondary forming surface; 232. Core-pulling cylinder; 233. Inclined guide seat; 2331. First variable diameter slide; 24. Second core-pulling assembly; 241. Second core-pulling slider; 25. Second pull hook; 26. Connecting seat; 3. Secondary fixed mold module; 31. Secondary assembly; 311. Third lower forming block; 3111. Second connecting forming part; 32. Secondary fixed mold core; 321. Secondary protrusion; 322. Secondary forming part 33. Slanted guide block; 331. Slanted tie rod; 332. Guide channel; 4. Fixed mold ejection mechanism; 41. Top plate; 411. Transmission block; 412. Auxiliary spring; 42. Ejector rod; 43. Ejection spring; 44. Ejector cylinder; 45. Upper pull rod; 451. First side protrusion; 452. First side concave; 453. Second side protrusion; 454. Second side concave; 46. Lower pull rod; 47. Upper limit block; 48. Lower limit block; 49. Mold parting rod; 491. Mold parting spring; 5. Primary cavity; 6. Secondary cavity; 10. Light guide; 101. Open end; 102. Protrusion feature; 103. Boss feature; 20. Decorative shell; 201. First undercut; 202. Second undercut. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] It should be understood that although the terms upper, middle, lower, top, one end, etc., appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for ease of understanding, and are not used to define any directional or sequential restrictions.

[0062] like Figure 1-6 As shown, a secondary molding mold for automotive headlight plastic parts with linked core pulling includes a primary mold module 1, a secondary mold module 3, and a moving mold module 2. The primary mold module 1 and the secondary mold module 3 are arranged opposite to each other. In the mold-opening state, the moving mold module 2 performs mold-opening or mold-closing actions towards the primary mold module 1 or towards the secondary mold module 3 through a rotating device in the injection molding machine.

[0063] The moving module 2 and the primary mold module 1 close to form a primary cavity 5 for molding a thick-walled light guide 10. The moving module 2 and the secondary mold module 3 close to form a secondary cavity 6 for molding a decorative shell 20. The decorative shell 20 is located around the light guide 10 and surrounds one end of the light guide 10, and forms an open end with the other end of the light guide 10, that is, the decorative shell 20 does not surround the other end of the light guide 10.

[0064] The position that constitutes the primary cavity 5 is defined as the primary mold position, and the position that constitutes the secondary cavity 6 is defined as the secondary mold position. The primary mold is defined as the primary molding process, and the secondary mold is defined as the secondary molding process.

[0065] The main difference between the primary mold module 1 and the secondary mold module 3 lies in the different structural design of the cavity and the different positioning of the molding function. The cavity of the primary mold module 1 is adapted to the three-dimensional contour of the thick-walled light guide 10, while the cavity of the secondary mold module 3 is set around the periphery of the thick-walled light guide 10 that has been formed on the moving module 2. The shape of the cavity matches the enclosing structure of the decorative shell 20.

[0066] The moving module 2 includes a moving mold core 21, which serves as a molding component that provides the surface in the primary and secondary molds. It has a primary molding part that forms the primary cavity 5 and a secondary molding part that forms the secondary cavity 6. The primary molding part and the secondary molding part together form the moving mold surface.

[0067] It should be noted that for light guides 10 with a large wall thickness, the wall thickness is reflected not only in the width direction of the light guide 10, but also in the height direction. If the wall thickness ratio of the light guide 10 formed on the moving mold core 21 is too large, that is, the greater the thickness of the light guide 10 left on the moving mold core 21, the more difficult it will be to demold after subsequent injection molding. This is because as the thickness of the moving mold core 21 increases, the contact area between the light guide 10 and the moving mold core 21 increases accordingly, and the clamping force and friction between the two also increase. At the same time, a thicker moving mold core 21 may lead to uneven mold cooling, causing inconsistent local shrinkage of the light guide 10, further aggravating the wrapping force of the light guide 10 on the moving mold core 21. In this case, when the ejector mechanism of the moving mold assembly 2 starts to work, the ejector pin needs to overcome a greater force to eject the light guide 10 from the moving mold core 21. If the ejector pin's thrust is insufficient or uneven, it can easily cause defects such as deformation, cracking, and surface scratches in the light guide 10 during demolding. Excessive demolding resistance may even lead to ejector pin bending, breakage, or damage to other related mold components, severely impacting production efficiency and the quality of the light guide 10. Therefore, the thickness of the light guide 10 must be fully considered.

[0068] In this embodiment, the moving module 2 plays a transfer role between the primary and secondary molding processes. The amount of light guide 10 formed on the moving module 2 is much smaller than the amount formed on the primary mold module 1. Furthermore, the optical functional surface and appearance surface of the light guide 10 are mainly formed by the primary mold module 1. This results in the formed light guide 10 being pressed tightly against the primary cavity 5. Correspondingly, the mold core unit is also tightly attached to the light guide 10.

[0069] Therefore, further integration Figure 3 and Figure 10 As shown, the one-time molding module 1 in this invention includes:

[0070] Multiple fixed mold core units and a primary molding component 11 that are closed to each other, together with the primary molding portion of the moving mold core 21, constitute a primary cavity 5. The multiple fixed mold core units constitute at least the side molding surfaces opposite each other in the width direction and the upper molding surface in the height direction of the primary cavity 5. The moving mold core 21 constitutes the lower molding surface. The primary molding component 11 constitutes the front and rear molding surfaces at the ends of the primary cavity 5. The above-mentioned molding surfaces are only described with respect to the light guide 10.

[0071] Reference Figure 7As shown, the primary molded module 1 also includes an auxiliary core-separating assembly 12 disposed between the primary molded core units. The auxiliary core-separating assembly 12 is compressed by the closing action of the moving module 2 when the mold is closed, and the auxiliary core-separating assembly 12 is configured to release in response to the mold-separating action, thereby separating at least two primary molded core units. As a result, at least one side molding surface in the primary cavity 5 will be separated under the action of the auxiliary core-separating assembly 12, thereby releasing a gap. The generation of this gap allows the light guide 10, which is tightly wrapped between the primary molded core units, to be released during the primary mold-separating action and retained on the moving mold core 21.

[0072] Reference Figures 8 to 10 As shown, the primary molding component 11 includes a first lower molding block 111 and a second lower molding block 112. The first lower molding block 111 is disposed at the rear end of the primary molding cavity 5, and the second lower molding block 112 is disposed at the front end of the primary molding cavity 5. Through the end molding surfaces on the first lower molding block 111 and the second lower molding block 112, a decorative shell connecting end is formed at the end of the light guide 10. One of the decorative shell connecting ends is configured to form a mechanical interlock with the decorative shell 20 during secondary molding. The decorative shell connecting end that forms the mechanical interlock refers to the end of the decorative shell 20 that surrounds the light guide 10.

[0073] Preferably, the primary molded component 11 separates from the end molding surface of the light guide 10 during primary mold separation, thereby further releasing the clamping force of the light guide 10 at the end of the primary mold cavity 5, so that the light guide 10 can be more smoothly removed from the upper molding surface, the side molding surface and the end molding surface.

[0074] To ensure that the light guide 10 is held on the moving mold core 21 in a single process, the moving module 2 of the present invention includes:

[0075] The moving mold core 21, the slider 22 slidably disposed on the moving mold core 21, and the first core-pulling assembly 23 and the second core-pulling assembly 24 disposed on the moving mold core 21 are arranged opposite to each other with respect to the width direction of the light guide 10. The slider 22 is specifically configured to slide between the primary position and the secondary position along the width direction of the light guide 10.

[0076] from Figure 4 and Figure 6As can be seen, in the primary form, the forming surface of the slider 22 forms the side connection part of the shell 20 on one side of the light guide 10 and remains engaged with the side connection part of the shell 20 to hold the light guide 10 on the moving mold core 21. In the secondary form, the slider 22 retracts to the secondary form position so that the portion vacated on the side of the light guide 10 forms a partial secondary cavity 6. At this time, the slider 22 does not provide a forming surface in the secondary form, and the side connection part of the shell 20 formed on the light guide 10 by the slider 22 is located in the secondary cavity 6. The shell 20 is formed on the side connection part, so that the shell 20 is reliably formed on the side of the light guide 10 and forms a stable mechanical interlocking structure with the side connection part.

[0077] Further integration Figure 11 and Figure 12 As shown, the first core-pulling assembly 23 includes a first core-pulling slider 231. The first core-pulling slider 231 has a primary molding surface 2311 that forms part of the structure of the light guide 10 in a primary molding, and a secondary molding surface 2312 that forms the first undercut portion 201 on the decorative shell 20 in a secondary molding. The primary molding surface 2311 supports and forms the light guide 10 in a primary molding.

[0078] The second core-pulling assembly 24 includes a second core-pulling slider 241, which is configured to form a second undercut 202 that is disposed opposite to the first undercut 201 in a secondary form.

[0079] In this process, both the first core-pulling slider 231 and the second core-pulling slider 241 remain extended in the primary mold. The first core-pulling slider 231 provides support at the bottom of the light guide 10 in the primary mold, preventing the light guide 10 from deforming under injection pressure. In the secondary mold, it participates in the formation of the secondary cavity 6. The first core-pulling slider 231 continues to remain extended, and its secondary molding surface 2312 forms the first undercut 201 on the decorative shell 20. The second core-pulling slider 241 remains inside the secondary cavity 6 and therefore does not participate in the primary mold forming. The second core-pulling slider 241 remains stationary before the secondary mold opens. After the secondary mold fixed mold assembly 3 and the moving mold assembly 2 are closed, the second core-pulling slider 241 forms the second undercut 202 on the decorative shell 20, which is opposite to the first undercut 201. The two undercuts work together to prevent the decorative shell 20 from falling off during subsequent use.

[0080] Preferably, the first core-pulling slider 231 is set to be independently controlled so that it will not move due to the one-time mold parting, thereby maintaining its cooperation with the light guide 10, which is beneficial for the light guide 10 to be kept on the moving mold core 21. The second core-pulling slider 241 can be set to extend and retract according to the mold opening and closing actions of the moving mold core 21.

[0081] Reference Figure 22As shown, the secondary mold module 3 includes a secondary component 31; the secondary component 31 includes a third lower molding block 311, which is disposed at the open end of the light guide 10. The third lower molding block 311 is configured at another shell connection end in the secondary mold, and the third lower molding block 311 blocks the connection between the end of the light guide 10 and the end of the shell 20 to maintain the open feature of the end of the headlight plastic part and prevent the molten material from flowing between the light guide 10 and the shell 20.

[0082] In the above embodiments, by integrating the primary molding surface 2311 and the secondary molding surface 2312 on the same first core-pulling slider 231, and keeping them in an extended state during both the primary and secondary molding cycles, a high degree of functional reuse and a unified molding benchmark are achieved. In the primary molding, the primary molding surface 2311 participates in forming the primary cavity 5, molding the bottom structure of the light guide 10, and simultaneously providing support for the thick-walled light guide 10, effectively preventing its deformation during high-pressure injection molding. In the secondary molding, there is no need for resetting or removal, and its secondary... The molding surface 2312 directly participates in the formation of the secondary cavity 6, forming the first undercut part 201 on the decorative shell 20. This not only simplifies the mold structure and eliminates the need for a separate core-pulling mechanism, but more importantly, since the position of the first core-pulling slider 231 remains unchanged between the two molding processes, it ensures the continuity and accuracy of the positioning reference of the decorative shell 20, which is based on the light guide 10, during the secondary molding process. This significantly improves the molding accuracy and bonding strength of the mechanical interlocking structure between the decorative shell 20 and the light guide 10, fundamentally enhancing the overall structural reliability.

[0083] like Figure 8 As shown, as a further embodiment of the primary mold module 1, the primary mold module 1 includes a primary mold template 16 and a top plate 41 movably disposed within the primary mold template 16. The mold core unit and the primary mold assembly 11 are disposed within the primary mold cavity of the primary mold template 16. The primary mold template 16 is also equipped with a mold ejection mechanism 4 that applies force to the top plate 41 in the demolding direction. The mold ejection mechanism 4 is activated when the mold is opened and drives the top plate 41 to move in the demolding direction, thereby applying a force to the light guide 10 toward the moving mold core 21. In the mold closed state, the mold ejection mechanism 4 holds the top plate 41 in a relatively upper position, so that the mold core unit is held in the primary mold position and is not affected by the top plate 41 and its position is changed.

[0084] Further reference Figure 4As shown, specifically, the fixed mold core unit includes an inner fixed core 13 and an outer fixed core 14 that are joined together at their front and rear ends, and a molding ejector block 15 that passes between the inner fixed core 13 and the outer fixed core 14. The molding ejector block 15 is used to apply a demolding force to the light guide 10 during the first mold parting, and to provide a parting gap between the inner fixed core 13 and the outer fixed core 14. The inner fixed core 13, the molding ejector block 15 and the outer fixed core 14 together with the moving mold core 21 form the primary cavity 5. The moving mold core 21 and the molding ejector block 15 are arranged opposite each other in the vertical direction.

[0085] The inner core 13 and the outer core 14 respectively form two opposite side forming surfaces in the primary cavity 5. Under the action of molding pressure and mold temperature, the side forming surfaces are tightly bound to both sides of the light-transmitting surface. That is, the side forming surfaces extend below the surface of the molding top block 15 and form the left and right boundaries of the primary cavity 5. In the closed mold state, the fixed mold core unit is engaged with the moving mold assembly 2 and is tightly bound to each other under the constraint of the moving mold assembly 2. Under the molding conditions of high temperature, high pressure, and high injection volume to form thick-walled plastic parts, the light guide 10 will be pressed tightly in the primary cavity 5 formed by the fixed mold core unit and is difficult to demold. Therefore, the auxiliary core-separating assembly 12 can be set between two adjacent fixed mold core units.

[0086] Among them, the side forming surface on the outer core 14 is set as the fixed side forming surface 141, and the side forming surface on the inner core 13 is defined as the movable side forming surface. The fixed side forming surface 141 is used to form a three-dimensional leather texture light-emitting surface on the side of the light guide 10. Therefore, the outer core 14 is used as a fixed component in the fixed mold core unit, which is held in contact within the primary mold cavity. The forming top block 15 is used as a movable component arranged between the inner core 13 and the outer core 14. The inner core 13 will be used as a movable separation component in the fixed mold core unit. The forming top block 15 is used to bear the force of the top plate 41, thereby ejecting the light guide 10 to the moving mold core 21. The inner core 13 is used to bear the force of the auxiliary core separation component 12 during the primary mold separation and perform the separation action. That is, the auxiliary core separation component 12 is set on the joint surface of the inner core 13. The auxiliary core separation component 12 is located on the opposite side of the three-dimensional leather texture light-emitting surface, so that when the inner core 13 performs the separation action, it will not affect the surface of the three-dimensional leather texture light-emitting surface.

[0087] In the following embodiments, the mating surface on which the auxiliary core-separating assembly 12 is configured is defined as the core-separating mating surface 132.

[0088] Furthermore, the fixed core unit is joined along the width direction of the light guide 10, and an offset gap 162 is provided between the primary mold cavity and the inner fixed core 13, which are opposite to the surfaces of the molding top block 15 and the outer fixed core 14, so as to allow the inner fixed core 13 to be offset within the primary mold cavity under the action of the auxiliary core splitting assembly 12.

[0089] Further integration Figure 4As shown, the aforementioned offset gap 162 gradually expands toward the moving mold core 21, so that the inner fixed core 13 swings under the action of the butterfly spring 121 when the mold is opened. In this way, the size of the offset gap 162 can be effectively compressed. Since the inner fixed core 13 only needs to be separated relative to the light guide 10 to solve its sticking problem, setting a reasonable offset gap 162 can not only ensure the stability in the closed mold state, but also achieve the purpose of the light guide 10 being removed from the primary mold core unit.

[0090] As a further embodiment of the cooperation between the inner core 13 and the slider 22, the forming surface of the slider 22 is embedded in the inner core 13. Specifically, the slider 22 is held in the primary mold position due to the mold closing action of the inner core 13. As a sliding component, the slider 22 has a gap reserved between the inner core 13 and the slider 22. This gap matches the offset gap 162 of the auxiliary core-separating assembly 12 actuating the inner core 13. The primary mold forming surface 2311 is obliquely overlapped with the outer core 14 and between it and the moving mold core 21, thereby forming a complete primary mold cavity closed area with the fixed mold core unit, ensuring that the three-dimensional leather texture light-emitting surface on the side of the light guide 10 is other than the surrounding surface. The precise connection of the molding surfaces ensures that when the auxiliary core-separating component 12 drives the inner core 13 to separate, the slider 22 remains in the primary molding position without needing to avoid it. At the same time, the first core-pulling slider 231 also remains in the extended position, thus holding the light guide 10 on the moving mold core 21. The oblique overlapping structure of the first core-pulling slider 231 can avoid interference with the outer core 14 and the moving mold core 21, while laying the foundation for the positioning and sealing of the subsequent secondary molding. This spatially separates the optical molding surface with high appearance requirements from the internal motion mechanism, ensuring both the processing accuracy of the textured surface and the strength of the mold, as well as ensuring smooth auxiliary core-separating action without interference.

[0091] Optionally, the inner core 13 is fixed to the primary mold platen assembly 16 by a limiting bolt, and the primary mold platen assembly 16 is provided with a through hole with an inner diameter larger than that of the limiting bolt. The limiting bolt is threaded to the inner core 13, and a gap is provided between the through hole and the outer wall of the limiting bolt. This gap matches the aforementioned offset gap 162 to allow the inner core 13 to separate at the moment of mold opening. In order to fix the position of the outer core 14 on the primary mold platen assembly 16, it is preferable to provide a positioning pin or positioning block structure between the primary mold platen assembly 16 and the outer core 14 to ensure the reliability of the position of the outer core 14 during mold opening and closing.

[0092] like Figure 13As shown, specifically, the outer core 14 and the inner core 13 surround the two sides of the molding top block 15, thus forming opposing mating surfaces at the front and rear ends of the molding top block 15. Correspondingly, the molding top block 15 and the inner core 13, and the molding top block 15 and the outer core 14 form mating surfaces. The auxiliary core-separating assembly 12 includes a plurality of butterfly springs 121 disposed on the core-separating mating surface 132 of the inner core 13. The butterfly springs 121 are pre-compressed in the primary mold-closed state and, in response to the mold opening gap generated between the primary mold-fixed mold assembly 1 and the moving mold assembly 2 when the mold is opened, apply a force to the inner core 13 to separate it from the primary cavity 5, thereby dismantling the holding force between the light guide 10 and the inner core 13. Specifically, the butterfly springs 121 are disposed in the normal direction of the core-separating mating surface 132.

[0093] In a preferred embodiment, the butterfly spring 121 is disposed between the inner core 13 and the core-separating joint surface 132 of the molding top block 15, and between the inner core 13 and the outer core 14. In the closed mold state, the inner core 13 is tightly closed to the molding top block 15 under the action of the moving mold core 21. When the mold is opened, the inner core 13 is instantaneously separated from the molding top block 15 and the outer core 14 under the action of the butterfly spring 121.

[0094] From a layout perspective, the butterfly spring 121 is preferably positioned close to the upper and lower ends of the inner core 13, while avoiding the forming surface of the fixed mold core unit. This layout ensures that the butterfly spring 121 can more effectively exert the initial parting force during mold opening, making the separation between the inner core 13, the outer core 14, and the forming top block 15 faster and smoother, reducing the sticking time of the light guide 10 in the fixed mold core unit. On the other hand, avoiding the forming surface of the fixed mold core unit prevents the butterfly spring 121 from interfering with the forming surface during mold operation, ensuring the forming quality of the light guide 10, avoiding surface defects and other defects caused by the presence of the butterfly spring 121, and improving the yield rate.

[0095] The first lower molding block 111 and the second lower molding block 112 are respectively connected to the mating surfaces of the inner core 13 and the outer core 14, making the demolding action of the first lower molding block 111 and the core separation action of the inner core 13 more closely related in space and time, and the system coordination is better. As the primary mold opens, the mating surfaces between the inner core 13 and the first lower molding block 111 and the second lower molding block 112 are simultaneously released and separated under the action of the butterfly spring 121. It should be noted that the first lower molding block 111 and the second lower molding block 112 are both formed on the primary mold module 1 and move away from the primary cavity 5 synchronously during the primary mold separation, while the third lower molding block 311 is embedded in the secondary mold core 32.

[0096] Further reference Figures 14 to 16As shown, as a further embodiment of the auxiliary core-separating assembly 12, the auxiliary core-separating assembly 12 also includes a core-separating push block 122. One end of the butterfly spring 121 abuts against the core-separating push block 122, and the other ends of the core-separating push block 122 and the butterfly spring 121 abut against the opposite core-separating engagement surfaces 132, respectively. The core-separating push block 122 serves as a force transmission medium for the butterfly spring 121, providing a reliable pushing surface for the auxiliary core-separating assembly 12 and converting the elastic potential energy of the butterfly spring 121 into an effective pushing force on the mold assembly. Its structure is simple and reliable, and it can accurately transmit the parting force to the core-separating engagement surfaces 132 that need to be separated in the inner core 13, the outer core 14, and the molding top block 15, ensuring the effectiveness and controllability of the auxiliary core-separating action.

[0097] Specifically, the auxiliary core-separating assembly 12 also includes a guide screw 123 passing through the core-separating push block 122, and the core-separating push block 122 is constrained on the guide screw 123. A movement gap 124 is provided between the core-separating push block 122 and the guide screw 123 to allow the core-separating push block 122 to slide under the action of the disc spring 121. The movement gap 124 matches the aforementioned offset gap 162. The guide screw 123 provides precise sliding guidance for the core-separating push block 122, ensuring the straightness and stability of its movement trajectory and preventing skew and jamming. The movement gap 124 allows the core-separating push block 122 to obtain an initial action without rigid interference in the initial stage of driving the disc spring 121, thereby sensitively and smoothly starting the parting action and improving the response speed and reliability.

[0098] The lead screw 123 has a head with a large outer diameter at one end and a tail with a threaded structure at the other end. The middle part of the lead screw 123 has a smooth cylindrical part 1231 with an outer diameter larger than that of the tail. The head of the lead screw 123 is inserted into the core-separating push block 122, and the core-separating push block 122 is provided with a through hole for the cylindrical part 1231 to pass through. The cylindrical part slides with the through hole of the core-separating push block 122 to limit the movement direction of the core-separating push block 122 and constrain its stroke range. The aforementioned movement gap 124 is formed between the head and the end face of the through hole.

[0099] Preferably, the auxiliary core-separating assembly 12 located at the lower ends of the core-separating mating surfaces 132 of the inner core 13 and the outer core 14 is provided, and its guide screw 123 is fixedly connected to the core-separating mating surface 132 of the outer core 14. The core-separating push block 122 is at least partially embedded in the core-separating mating surface 132 of the outer core 14, and the core-separating push block 122 abuts against the core-separating mating surface 132 of the inner core 13.

[0100] An auxiliary core-separating assembly 12 located between the inner core 13 and the molding top block 15 is disposed at the upper ends of their respective core-separating mating surfaces 132. The difference is that its guide screw 123 is fixed on the core-separating mating surface 132 of the inner core 13, and the core-separating push block 122 is at least partially embedded in the core-separating mating surface 132 of the inner core 13. The core-separating push block 122 abuts against the core-separating mating surface 132 of the molding top block 15. Furthermore, depending on the size of the arable area of ​​the core-separating mating surface 132 of the molding top block 15 and the inner core 13, the guide screw 123 is disposed in the middle position of the core-separating push block 122 or at the diagonal end of the core-separating push block 122. The purpose is to adjust the guiding position of the guide screw 123 according to the size of the core-separating push block 122.

[0101] Furthermore, in some embodiments, the disc spring 121 is sleeved on the guide screw 123 to provide guidance for the movement of the core-splitting push block 122. In other embodiments, the guide screw 123 is located at the diagonal end of the core-splitting push block 122, in which case the guide screw 123 is arranged outside the disc spring 121.

[0102] As can be seen from the above embodiments, on different core-separating joint surfaces 132, the butterfly spring 121 applies separation force to the molding top block 15 and the inner fixed core 13 respectively through the core-separating push block 122. In the closed mold state, it maintains a pre-compression state with the extrusion of the core-separating push block 122. When the mold opening gap is generated between the primary mold fixed mold module 1 and the moving mold core 21 module, the butterfly spring 121 releases elastic potential energy, pushes the core-separating push block 122 to move axially along the guide screw 123, and then applies a pushing force to the molding top block 15, causing the molding top block 15 and the inner fixed core 13 to generate an initial separation displacement along the core-separating joint surface 132. In addition, the multiple butterfly springs 121 are arranged about the contour end of the inner fixed core 13, so that the separation action of the fixed mold core unit during mold opening can be uniformly presented through the inner fixed core 13, effectively avoiding the separation lag problem caused by the viscous force between the two.

[0103] Further integration Figure 7 As shown, after the first mold parting, the inner core 13, which is in a separated state, returns to a closed state with the molding top block 15 and the outer core 14 when the mold is closed. The moving mold core 21 is provided with a connecting seat 26 arranged along the length of the light guide 10 in the middle. The connecting seat 26 abuts against the first mold fixed mold module 1 and the second mold fixed mold core 32 in the closed state and cancels the mold opening gap, thus optimizing the mold structure layout. The connecting seat 26 in the middle of the moving mold core 21 serves as a common reference for the two fixed molds to align, ensuring molding accuracy.

[0104] Specifically, the inner core 13 has a connecting block 133 on its surface. The connecting block 133 is located on one side of the connecting seat 26. There is an inclined surface between the connecting seat 26 and the connecting block 133 that is opposite to each other in the mold closing direction. Through the engagement of the inclined surface between the connecting block 133 and the connecting seat 26, the connecting block 133 and the inclined surface of the connecting seat 26 are pressed together when the mold is closed, so that the inner core 13 closes towards the molding top block 15. When the mold is opened, due to the mold opening force of the moving mold assembly 2 and the primary mold assembly 1, the connecting block 133 separates from the connecting seat 26 in the vertical direction, thereby releasing the bias gap 162 that allows the inner core 13 to move away from the engagement direction, creating the physical conditions for the release of the spring force of the butterfly spring 121.

[0105] The mating seat 26 and the moving mold core 21 are fixedly connected by bolts. A pad is fixedly connected to the surface of the mating seat 26 by bolts. The pad provides an inclined surface that mates with the mating block 133. Similarly, the mating block 133 and the inner fixed core 13 are fixedly connected by bolts. By adjusting the tightness of the bolts, the degree of engagement between the inclined surfaces of the mating block 133 and the mating seat 26 can be adjusted, thereby controlling the stability during mold closing.

[0106] It is worth mentioning that the aforementioned pads can also be set on the other mating surfaces of the fixed mold core unit, thereby improving the flatness of adjacent spatial components.

[0107] like Figure 14 , Figure 17 and Figure 18 As shown, in a further embodiment of the first lower molding block 111, the first lower molding block 111 is embedded in the bottom of the outer core 14, specifically arranged on the decorative shell connecting end of the light guide 10 surrounded by the decorative shell 20. The decorative shell connecting end and the decorative shell 20 form a mechanical interlock. The mechanical interlock specifically refers to the formation of a stepped boss feature 103 on the corresponding end of the light guide 10. The profile of the first lower molding block 111 is set on the upper part of the boss feature 103 and sealed by the moving mold core 21. The decorative shell 20 is formed on... On the boss feature 103, during the one-time demolding process, the mechanical interlocking structure at the shell connection end can offset the local clamping force generated by the thick wall of the light guide 10, preventing the light guide 10 from deforming or separating from the boss feature 103 during core pulling. At the same time, its arrangement of being embedded in the bottom of the outer core 14 also ensures its positioning accuracy in the one-time mold module 1, forming a stable synergy with the mold parting action of the outer core 14 and the inner core 13, further improving the reliability and consistency of the one-time molding and demolding process.

[0108] Specifically, an ejector spring 113 is provided between the first lower molding block 111 and the outer core 14. The ejector spring 113 is configured to apply a force to the first lower molding block 111 to move it away from the primary cavity 5 when the mold is opened. A first slide rail 142 is provided on the outer core 14. The first lower molding block 111 is slidably connected to the first slide rail 142. The extension direction of the first slide rail 142 is set to guide the first lower molding block 111 to move along the demolding direction of the boss feature 103.

[0109] Optionally, the ejector spring 113 and the first slide rail 142 are arranged downwards, so that the first lower molding block 111 can slide smoothly downwards along the guide of the first slide rail 142 under the elastic driving force of the ejector spring 113 during the mold opening process. This allows the ejector force to be applied to the end of the light guide 10, especially the area of ​​the boss feature 103 at the shell connection end, during the one-time mold separation. This creates a more precise coordination with the mold separation action of the inner core 13 and the outer core 14, causing the light guide 10 to tend to move towards the moving mold core 21, thereby improving the stability and efficiency of the demolding process.

[0110] Preferably, the first slide rail 142 is set to have an angle inclined toward the boss feature 103, so as to apply an initial ejection force during the demolding stroke, and then demold without interfering with the boss feature 103.

[0111] As one assembly method of the ejector spring 113, the first lower forming block 111 has a countersunk hole 114, the ejector spring 113 is placed in the countersunk hole 114, the countersunk hole 114 has an ejector pusher 115, and a bolt is fixedly installed in the countersunk hole 114. The ejector spring 113 is sleeved on the bolt, one end of the ejector spring 113 abuts against the ejector pusher 115, and the other end of the ejector spring 113 abuts against the bottom of the countersunk hole 114. The head of the bolt is clearance-fitted with the ejector pusher 115. Therefore, the above-mentioned ejector spring 113... 13. The structure formed by the ejector block 115 and the bolt is similar to that of the auxiliary core-separating assembly 12. Both are kept compressed in the mold-closed state and released when the mold is opened. At this time, the ejector spring 113 pushes the ejector block 115 to abut against the fixed outer core 14, so that the first lower forming block 111 moves downward under the reaction force of the ejector spring 113. At the same time, under the guidance of the first slide rail 142, the sliding trajectory of the first lower forming block 111 is restricted, thus completing the separation of the boss feature 103 of the light guide 10.

[0112] Preferably, the first lower molding block 111 has a first groove 116 that cooperates with the first slide rail 142. A limiting groove 117 is provided at the lower end of the first groove 116, and a first limiting protrusion 1421 is provided at the end of the first slide rail 142 that is directly opposite to the limiting groove 117. The limiting groove 117 and the first limiting protrusion 1421 are spaced apart in the mold closed state, and the limiting groove 117 abuts against the first limiting protrusion 1421 in the mold open state, thereby limiting the extreme position of the first lower molding block 111 and preventing the first lower molding block 111 from coming out.

[0113] Reference Figures 19 to 22 As shown, specifically, the second lower molding block 112 is provided with a first connecting molding portion 1121, and the third lower molding block 311 is provided with a second connecting molding portion 3111. The first connecting molding portion 1121 matches the open end 101 of the light guide 10 in the primary molding process, and the second connecting molding portion 3111 matches the open end 101 of the light guide 10 and the end of the decorative shell 20 in the secondary molding process. The aforementioned open end 101 refers to the end of the light guide 10 that is away from the decorative shell connecting end that constitutes the mechanical interlock. The open end 101 of the light guide 10 is recessed into the second connecting molding part 3111 to accurately form the connection structure between the open end 101 of the light guide 10 and the end of the decorative shell 20. A space for the molten material of the decorative shell 20 to enter is formed around the recessed part of the light guide 10, thereby improving the integration of the light guide 10 and the decorative shell 20. An effective sealing structure can be formed at the end joint of the light guide 10 and the decorative shell 20, which greatly enhances the mechanical strength and sealing of the two, and effectively prevents material crossflow and stress concentration at the joint line.

[0114] In other words, one of the shell connecting ends on the light guide 10 is mechanically interlocked with the shell 20 through the first lower molding block 111, and the other shell connecting end on the light guide 10 is an open end, open to the end of the shell 20, but its two sides are still constrained by the shell 20, so that the light guide 10 can be connected with other vehicle lamp trims.

[0115] As an embodiment of the operation of the second lower molding block 112 and the third lower molding block 311 during mold closing and opening, the bottom of the second lower molding block 112 is provided with a first hook 1125, and the moving mold core 21 is provided with a second hook 25 that cooperates with the first hook 1125. The second hook 25 is configured to pull the second lower molding block 112 to move during mold opening to release its constraint on the connecting end of the decorative shell. Under the action of mold opening, the second hook 25 will drive the first hook 1125 and the second lower molding block 112 to move away from the other end of the light guide 10, thereby releasing the constraint of the light guide 10 at the other end during mold opening.

[0116] Furthermore, a sloping channel 1122 is provided on the rear side of the second lower forming block 112. A sloping guide rod 118 is fixedly provided on the primary forming mold assembly 16, and the sloping guide rod 118 passes through the sloping channel 1122. A second slide rail 1123 fixed to the primary forming mold assembly 1 is provided on the back of the second lower forming block 112, and the back of the second lower forming block 112 is slidably connected to the second slide rail 1123. A second limiting protrusion 1181 is provided at the end of the sloping guide rod 118, and a third limiting protrusion 1124 is provided in the sloping channel 1122, directly opposite the second limiting protrusion 1181. In the closed mold state, the third limiting protrusion 1124 and the second limiting protrusion 1181 are spaced apart, thereby defining the travel of the second lower forming block 112. Under the mold opening action, the moving mold assembly 2... The second lower molding block 112 moves synchronously with it. Since the inclined guide rod 118 is fixed to the primary molding template group 16, it will apply a guiding force to the second lower molding block 112 along the inclined channel 1122, forcing the second lower molding block 112 to slide away from the light guide 10 along the second slide rail 1123. At the same time, the second pull hook 25 and the first pull hook 1125 remain in a cooperating state, continuously pulling the second lower molding block 112 to move in the specified direction until the third limiting protrusion 1124 abuts against the second limiting protrusion 1181. At this time, the second lower molding block 112 reaches the preset limit position, and its molding constraint on the other end of the light guide 10 is completely released, effectively avoiding the sticking between the plastic part and the second lower molding block 112 during the mold opening process, and ensuring that the light guide 10 maintains structural integrity in the subsequent demolding steps.

[0117] In this process, the second lower forming block 112 is obliquely moved away from the light guide 10 under the guidance of the oblique channel 1122 and the oblique guide rod 118, and then the first hook 1125 separates from the second hook 25 to allow the moving module 2 to be adjusted to the secondary shape position.

[0118] The first hook 1125 is also provided on the third lower molding block 311. The parting structure of the third lower molding block 311 is the same as that of the second lower molding block 112. The only difference between the two is that the second connecting molding part 3111 on the third lower molding block 311 and the first connecting molding part 1121 on the second lower molding block 112 have different shapes. Therefore, the parting structure of the third lower molding block 311 will not be described in detail.

[0119] Further integration Figure 4 and Figure 6 As shown, the position switching of slider 22 is reflected in the cooperation between moving module 2 and primary mold fixed module 1, and the cooperation between moving module 2 and secondary mold fixed module 3. That is, during any mold opening action of moving mold core 21, slider 22 does not move relative to moving mold core 21. Only when closing is slider 22 driven to move on moving mold core 21 by primary mold fixed module 1 or secondary mold fixed module 3.

[0120] The slider 22 has a forming surface for forming a protrusion feature 102 on the side of the light guide 10. The protrusion feature 102 forms the aforementioned side connection portion, avoids the light-emitting surface and light-receiving surface of the light guide 10, and is located on the forming area of ​​the shell 20. The slider 22 has a primary mold position. In the primary mold position, the slider 22 extends into the primary cavity 5 under the action of the primary mold fixed mold assembly 1 and forms the protrusion feature 102. During the primary mold opening cycle, the slider 22 always remains in the primary mold position and applies a holding force to the protrusion feature 102 to hold the light guide 10 on the surface of the moving mold core 21.

[0121] The slider 22 also has a secondary position. In the secondary position, the slider 22 retracts and moves away from the light guide 10 under the action of the secondary mold module 3, and a space of secondary cavity 6 is spaced out on the outside of the protrusion feature 102 of the light guide 10. That is, the slider 22 makes room for the decorative shell 20 to be formed on the protrusion feature 102. In other words, the slider 22 does not participate in the forming of the decorative shell 20 in the secondary position.

[0122] As a further embodiment of the slider 22 and the protruding feature 102 on the light guide 10, the secondary cavity 6 is used to form the decorative shell 20 on the periphery of the light guide 10. The protruding feature 102 is formed on the side of the light-transmitting surface of the light guide 10, thereby avoiding the influence of the protruding feature 102 on the light-transmitting surface. The protruding feature 102 is placed in the secondary cavity 6 at the secondary molding position and is located within the molding coverage area of ​​the decorative shell 20, ensuring that the protruding feature 102 on the light guide 10 is completely covered by the decorative shell 20 after secondary molding, so that the final product has a continuous shape and does not affect the optical performance of the headlight. From the perspective of primary molding demolding, the protruding feature 102, as the action point of the slider 22, is the basis for realizing the mechanical interlock between the decorative shell 20 and the light guide 10 in the secondary molding, while the covering of the decorative shell 20 cleverly transforms the functional structure into an internal reinforcement structure, improving the overall integrity and reliability of the product.

[0123] Further reference Figures 23 to 25 As shown, the slider 22 includes a molded side protrusion 222 for forming the protrusion feature 102. The molded protrusion is embedded in the inner core 13 and connects with the molding surface of the inner core 13 to form the side molding surface of the primary cavity 5 together. The end face of the molded side protrusion 222 is provided with a concave molding portion 2221. The opening direction of the concave molding portion 2221 is directly opposite to the movement direction of the slider 22 from the secondary mold position to the primary mold position. The protrusion feature 102 on the light guide 10 is formed by the concave molding portion 2221. As a result, the upper end surface of the concave molding portion 2221 forms a pressing surface 2222. The pressing surface 2222 applies a holding force to the light guide 10, thereby holding the light guide 10 on the moving mold core 21.

[0124] In the primary molding stage, the precise positioning of the slider 22 establishes the molding foundation for the protruding feature 102. This ensures the molding accuracy of the side structure of the light guide 10 and avoids potential positional misalignment during subsequent assembly, effectively improving the consistency between the thick-walled light guide 10 and the trim shell 20, as well as overall production efficiency. Furthermore, since the presence of the protruding feature 102 does not negatively impact the optical performance of the light guide 10, its positioning function during primary molding also assists in the precise fitting of the trim shell 20 and the light guide 10 during secondary molding, further enhancing the structural stability of the product.

[0125] Furthermore, the slider 22 also includes a support surface 223 connected to the forming side protrusion 222. The inner core 13 abuts against the support surface 223 in the mold closed state. The inner core 13 and the support surface 223 are engaged at an angle. The slider 22 is positioned at a secondary mold position and spaced apart from the secondary cavity 6.

[0126] Among them, the support surface 223 is set to be composed of multiple inclined surfaces, thereby forming a stable mechanical lock during the first mold closing, forming an additional locking force on the slider 22, and converting the parting force into a smooth release constraint force during the first mold opening process. This process can effectively avoid damage to the light guide 10 due to instantaneous stress concentration, ensuring its smooth demolding and stable retention in the moving mold core 21.

[0127] In addition, the support surface 223 is set opposite to the inclined surface of the first groove wall 2211, so that during the one-time mold closing process, as the inner core 13 pushes against the first groove wall 2211, the support surface 223 and the inner core 13 gradually come into contact, thereby ensuring the stability of the slider 22 in the one-time mold position.

[0128] from Figure 4 As can be seen from the diagram, as a further embodiment of the inner core 13 cooperating with the slider 22, the inner core 13 is provided with a first protrusion 131 inserted into the mating groove 221. The first protrusion 131 moves toward the mating groove 221 as the mold closes and pushes against and holds the slider 22 in the one-time mold position through the first groove wall 2211. The first protrusion 131 is provided with an inclined surface facing the first groove wall 2211, and the surface of the first protrusion 131 facing the second groove wall 2212 is spaced apart from the second groove wall 2212.

[0129] from Figure 6 As can be seen, the secondary mold core 32 is provided with a second protrusion 321 inserted into the mating groove 221, and the second protrusion 321 abuts against the second groove wall 2212, forcing the slider 22 away from the secondary cavity 6. The secondary mold core 32 is provided with a secondary forming part 322 separated between the forming side protrusion 222 and the light guide 10. In the secondary mold closed state, the moving mold core 21 closes on the secondary forming part 322.

[0130] It should be noted that the inclined surface engagement between the inner core 13 and the slider 22 not only converts the vertical force during mold closing into a horizontal component along the direction of the first groove wall 2211, making the movement of the slider 22 smoother, but also avoids instantaneous impact through the gradual contact of the inclined surfaces. The spacing between the first protrusion 131 and the second groove wall 2212 effectively avoids accidental contact between the inner core 13 and the second groove wall 2212 during mold closing, ensuring that the slider 22 accurately reaches the primary molding position under the guidance of the first groove wall 2211. This lays the foundation for the subsequent tight engagement between the support surface 223 and the inner core 13, further improving the structural reliability of the mold in the primary molding stage. When the first molding is completed and the mold opening stage begins, the inner core 13 moves backward with the follow module 2, and the first protrusion 131 gradually disengages from the mating groove 221. The pushing action between the first protrusion 131 and the first groove wall 2211 is released, and the slider 22 can smoothly switch to the secondary molding position under the drive of the second protrusion 321. Throughout the process, the first protrusion 131 and the second groove wall 2212 always maintain a distance, which will not interfere with the position switching of the slider 22, thus ensuring the smoothness of the mold state switching before the secondary molding.

[0131] In this embodiment, the inclination directions of the first groove wall 2211 and the second groove wall 2212 are opposite to each other, and the first groove wall 2211 is inclined in the direction close to the light guide 10, while the second groove wall 2212 is inclined in the direction away from the light guide 10, so that the cross section of the mating groove 221 is approximately V-shaped, and the mating groove 221 is flared in the direction of mold closing, which is conducive to the insertion of the first protrusion 131 or the second protrusion 321 into it.

[0132] Furthermore, the slope of the second groove wall 2212 is less than that of the supporting surface 223. During the secondary molding switch, because the supporting surface 223 has a larger slope, when the slider 22 is driven by the second protrusion 321 to switch to the secondary mold position, the contact tendency between the secondary mold core 32 and the supporting surface 223 is preferentially offset by the inclined guide of the second groove wall 2212. The frictional force of the second protrusion 321 on the slider 22 is concentrated on the second groove wall 2212, rather than directly acting on the mating area of ​​the supporting surface 223. This optimization of the force path not only minimizes the frictional loss between the supporting surface 223 and the secondary mold core 32, protecting the accuracy of the supporting surface 223, but also allows the slider 22 to maintain a smooth movement trajectory during the switching process, avoiding minor displacements or jamming caused by uneven local force. This also indirectly extends the service life of the support surface 223, reduces the grinding or repair work of the support surface 223 in subsequent mold maintenance, and helps maintain the stability of the mold during long-term production. In addition, since the second groove wall 2212 bears the main friction, its surface can be treated with wear-resistant coating to further improve the overall durability of the mold and provide a reliable guarantee for the mass and efficient production of the thick-walled light guide 10 for automotive lights.

[0133] As a further improvement to the slider 22, the slider 22 is provided with an air passage hole 229. The air passage hole 229 extends from the side of the slider 22 away from the light guide 10 to the second groove wall 2212. During the one-time mold opening process, as the butterfly spring 121 drives the inner core 13 to offset, and the moving mold group 2 separates, the inner core 13 and the slider 22 can separate and generate an air passage gap. This air passage gap can be connected to the air passage hole 229, thereby timely expelling the residual gas in the cavity during the molding process, reducing the probability of defects such as bubbles and shrinkage cavities inside the thick-walled light guide 10, and optimizing the optical uniformity and light transmission effect of the light guide 10.

[0134] from Figure 6 As can be seen, the moving mold core 21 is provided with a sliding groove 211 for accommodating the slider 22. The sliding groove 211 is located on the surface of the moving mold core 21, and a space for the slider 22 to move is provided in the sliding groove 211. When the mold is opened, the surface of the moving mold core 21 is released, and at the same time, the air gap is connected to the air hole 229 to complete the release of residual gas.

[0135] from Figure 25 As can be seen, as a further embodiment of the sliding of slider 22, a slide block 212 is fixedly provided in the sliding groove 211. The slide block 212 is provided with a T-shaped channel 213. The bottom of slider 22 is provided with a T-shaped guide part 224. The T-shaped guide part 224 is constrained to slide within the T-shaped channel 213. Specifically, the T-shaped guide part 224 refers to the protrusions provided on both sides of slider 22. The T-shaped channel 213 is composed of the protrusions provided on the upper end of slide block 212. The protrusions on slide block 212 press against the protrusions on slider 22, providing reliable guidance for the movement of slider 22. This allows slider 22 to withstand the clamping force from the contraction of light guide 10 in the primary position without swaying, ensuring the stability of light guide 10. Moreover, when switching to the secondary position, the movement trajectory is accurate and will not damage the product or mold due to jamming.

[0136] Specifically, the slide block 212 has a built-in positioning spring 225, and the end of the positioning spring 225 is provided with a sliding protrusion 226. The bottom of the slider 22 is provided with a primary positioning groove 227 and a secondary positioning groove 228 spaced apart. The sliding protrusion 226 engages with the primary positioning groove 227 in the primary position and engages with the secondary positioning groove 228 in the secondary position, so as to realize the reliable switching and precise locking of the slider 22 in the primary and secondary forming positions, reduce the shaking or misalignment of the slider 22 during the movement, ensure the positional consistency of the slider 22 in the primary and secondary forming, and improve the connection quality between the secondary forming part and the primary forming part of the light guide 10.

[0137] like Figures 8 to 12As shown, specifically, the first core-pulling assembly 23 includes a core-pulling cylinder 232 and an inclined guide seat 233 provided on the actuating end of the core-pulling cylinder 232. The inclined guide seat 233 is provided with a first variable diameter slide 2331. The first core-pulling slider 231 is slidably disposed on the first variable diameter slide 2331 and is held in the extended position during the primary and secondary molding processes.

[0138] The primary molding surface 2311 is formed at the top of the first core-pulling slider 231, and together with the moving mold core 21 and the primary mold fixed module 1, forms the sealing surface of the primary cavity 5. The secondary molding surface 2312 is formed at the end face of the first core-pulling slider 231, and together with the moving mold core 21 and the secondary mold fixed module 3, forms the sealing surface of the secondary cavity 6. The first variable diameter slide 2331 allows the inclined guide seat 233 to be arranged in the front-back direction.

[0139] By configuring the core-pulling cylinder 232, the inclined guide seat 233, and the first variable-diameter slide 2331, the first core-pulling slider 231 is kept in the extended position during both the primary and secondary molding cycles. Its primary molding surface 2311 and secondary molding surface 2312 are located at the top and bottom ends of the first core-pulling slider 231, respectively, allowing the same first core-pulling slider 231 to participate in the sealing of both the primary cavity 5 and the secondary cavity 6. This avoids frequent reciprocating motion of the first core-pulling slider 231 between the two mold closing cycles, simplifies the control logic, improves the reliability of the action and the production cycle time, and ensures the consistency of the reference between the two molding cycles.

[0140] Specifically, the secondary mold module 3 also includes a secondary mold core 32 and an inclined guide block 33 fixed on the secondary mold core 32. An inclined pull rod 331 is provided inside the inclined guide block 33, and a guide channel 332 matching the inclined pull rod 331 is provided inside the second core-pulling slider 241.

[0141] The second core-pulling slider 241 is disposed relative to the secondary molding surface and located below the primary molding surface, and the second core-pulling slider 241 is spaced outside the primary cavity 5 in the primary molding process.

[0142] The inclined core-pulling movement of the second core-pulling slider 241 is achieved through the cooperation of the inclined guide block 33 and the inclined pull rod 331 on the secondary mold core 32 with the guide channel 332 inside the second core-pulling slider 241. Crucially, the second core-pulling slider 241 is positioned outside the primary cavity 5, completely avoiding interference with the light guide component 10 structure during primary molding. Only during secondary mold closing is its inclined movement driven by the secondary mold core module 3 to enter the working position for molding the second undercut portion 202 on the decorative shell 20. This design solves the spatial and temporal challenges of lateral core-pulling molding on the existing light guide component 10.

[0143] Combination Figure 8 and Figure 12 As shown, the moving mold core 21 is provided with moving mold surfaces on both sides of the connecting seat 26. Correspondingly, two sets of fixed mold core units are arranged symmetrically in the primary mold plate group 16, and two sets of lower forming surfaces are arranged symmetrically on the secondary mold core 32. There is one top plate 41, and the two primary cavities 5 are located within the projection range of the top plate 41.

[0144] The first core-pulling slider 231 and the second core-pulling slider 241 are arranged on both sides of the trim shell 20 corresponding to the light guide 10 along the width direction of the light guide 10. The core-pulling cylinder 232 and the inclined guide seat 233 are arranged at the lower part of the connecting seat 26. The slider 22 is arranged in the middle of the light guide 10. The first core-pulling slider 231 and the second core-pulling slider 241 are arranged obliquely opposite each other. Two first core-pulling sliders 231 are symmetrically arranged on the same inclined guide seat 233. The first core-pulling slider 231 and the second core-pulling slider 241 are arranged on both sides along the width direction of the headlight plastic part. The core-pulling cylinder 232 and other driving mechanisms are arranged at the lower part. The slider 22 is arranged in the middle of the length direction of the light guide 10. This layout makes the force symmetrical and balanced, the mold structure compact and rigid, the moving parts do not interfere with each other, and the heat distribution is uniform, which is beneficial to improving the mold life and molding stability.

[0145] like Figure 8 , Figures 26 to 28 As shown, specifically, the primary mold assembly is provided with a mold ejection mechanism 4. The mold ejection mechanism 4 includes a movable top plate 41 and multiple mold ejection units connected to the top plate 41. The top plate 41 is connected to the molding top block 15 and is configured to drive the top plate 41 and the molding top block 15 connected thereto to move in the demolding direction in response to the mold opening action of the primary mold assembly 1 and the moving mold assembly 2, so as to separate the light guide 10 from the mold core unit.

[0146] Specifically, the primary molding assembly includes a primary molding template group 16, a top plate 41 that is housed and movable within the primary molding template group 16, and a top plate 41 that is connected to the molding top block 15 via a top rod 42.

[0147] The fixed mold ejection unit includes an ejector cylinder 44 fixed on the primary mold fixed mold plate assembly 16, an ejection spring 43 abutting between the primary mold fixed mold plate assembly 16 and the top plate 41, and a tie rod assembly connected between the moving mold assembly 2 and the top plate 41. The actuating end of the ejector cylinder 44 is connected to the top plate 41. The ejection spring 43 applies a force to the top plate 41 toward the moving mold core 21. The tie rod assembly pulls the top plate 41 toward the moving mold core 21 at least during the mold opening action.

[0148] The ejector cylinder 44 provides active and controllable main ejection force; the ejection spring 43 provides fast and gentle initial ejection force and serves as a safety buffer; the tie rod assembly achieves rigid mechanical linkage with the mold opening action of the moving mold, ensuring precise ejection timing, so that the ejection action has controllable force, fast response and precise timing.

[0149] As a further explanation of the fixed mold core unit, an ejection channel 17 is formed between the inner fixed core 13 and the outer fixed core 14 to accommodate and guide the molding ejector block 15. The ejection channel 17 is disposed between the mating surfaces of the inner fixed core 13 and the outer fixed core 14. The molding ejector block 15 is provided with at least one first limiting step 151 in the direction toward the primary cavity 5. A second limiting step 172 is provided in the ejection channel 17 to cooperate with the first limiting step 151. The second limiting step 172 is formed in the inner fixed core 13. On the inner wall of the outer core 14, the forming top block 15 is fixedly connected to the top plate 41 by the ejector rod 42 passing through the primary forming template group 16; the mold ejection mechanism 4 acts on the top plate 41 in the mold closed state to limit the forming top block 15 to the forming position; when the forming top block 15 is in the forming position, a predetermined ejection gap 171 is formed between its lower end and the bottom surface of the ejection channel 17, and the ejection gap 171 is specifically formed between the first limiting step 151 and the second limiting step 172.

[0150] It is worth mentioning that when the fixed mold ejection mechanism 4 and the auxiliary core-separating assembly 12 work synchronously, the ejection gap 171 forms a certain cavity structure in the ejection channel 17, thereby causing the inner fixed core 13 and the forming top block 15 to undergo micro-motion separation under the initial component force of the butterfly spring 121, thus relieving the pressure in the ejection channel 17 in advance and initially loosening the light guide 10.

[0151] Specifically, one end of the push rod 42 is fixedly connected to the top plate 41, and the other end of the push rod 42 is provided with a transmission block 411. The transmission block 411 is T-shaped and embedded in the top of the forming top block 15, thereby realizing the transmission connection between the push rod 42, the forming top block 15 and the top plate 41.

[0152] Preferably, an auxiliary spring 412 is sleeved at the lower end of the ejector rod 42. The auxiliary spring 412 is embedded in the lower end face of the primary mold platen assembly 16 and abuts against the transmission block 411. This provides a preload force to the transmission block 411 and the forming ejector block 15 in the direction of the moving mold core 21 during the initial stage of mold opening. The initial component force of the auxiliary spring 412 further enhances the micro-motion separation effect between the forming ejector block 15 and the inner mold core 13, as well as the tendency of the forming ejector block 15 towards the mold opening direction. When the mold ejection mechanism 4 and the auxiliary core separation assembly 12 operate synchronously, the elastic force of the auxiliary spring 412 can work together to accelerate the ejection of the forming ejector block 15 and more efficiently relieve the pressure in the ejection channel 17. In addition, the auxiliary spring 412 can also play a buffering and resetting role during the mold closing process. Combined with the pull of the mold ejection mechanism 4 on the forming ejector block 15 during mold closing, it maintains the stability of the forming ejector block 15 in the mold closing position.

[0153] As a further embodiment of the movement of the top plate 41, the primary mold plate group 16 is provided with an active space 161 for the movement of the top plate 41. The primary mold plate group includes a primary upper mold plate and a primary lower mold plate that are joined together. An active space 161 is spaced between the primary lower mold plate and the primary upper mold plate. The top plate 41 is movably disposed in the active space 161 in the mold opening and closing direction.

[0154] In cases with two primary cavities 5, there is one top plate 41. Ejector rods 42 are positioned at both ends of the top plate 41 along the length of the light guide 10. Multiple guide plugs are also provided on the top plate 41, arranged sequentially along the length of the light guide 10. The guide plugs pass through the top plate 41 and are fixed to the lower mold plate of the primary mold. Their outer circumferential surfaces are fitted with corresponding through holes on the top plate 41, providing precise guidance for the reciprocating movement of the top plate 41. This prevents the top plate 41 from tilting or jamming during sliding, ensuring that the ejector rods 42 exert uniform ejection force on the molding block 15. Simultaneously, the number and spacing of the guide plugs can be adjusted according to the length of the light guide 10 and the distribution of the primary cavities 5 to further improve the stability of the top plate 41's movement. This ensures that the light guides 10 in the two primary cavities 5 can separate synchronously and smoothly from the inner core 13 during mold opening, effectively preventing deformation or sticking of the plastic part due to uneven force on the top plate 41. In addition, the mating structure between the guide plug and the top plate 41 can reduce the wear of the top plate 41 during its movement, extend the service life of the mold, and ensure the long-term stable operation of the mold parting system.

[0155] In this embodiment, the fixed mold ejection mechanism 4 includes an ejection spring 43 abutting against the top of the top plate 41 and the top of the movable space 161, and an ejection cylinder arranged in the demolding direction. The top plate 41 is connected to the actuating end of the ejection cylinder. The ejection cylinder is fixed on the fixed mold plate of the primary mold. When the ejection cylinder is in the retracted state, it pulls and holds the top plate 41 in the forming position. The ejection spring 43 is compressed in the closed mold state and applies a force to the top plate 41 in the demolding direction. The ejection cylinder is started synchronously in response to the mold opening action. The extension action of the ejection cylinder drives the top plate 41 to move toward the moving mold core 21.

[0156] To ensure the positional stability of the ejector spring 43, a positioning protrusion is provided on the primary mold upper fixed mold plate. The positioning protrusion is built into the primary mold upper fixed mold plate. The ejector spring 43 is placed in the primary mold upper fixed mold plate and sleeved on the positioning protrusion. The end of the ejector spring 43 extends out of the primary mold upper fixed mold plate and is embedded in the top plate 41. That is, the ejector spring 43 abuts between the primary mold upper fixed mold plate and the top plate 41. The ejector spring 43 stores energy when the mold is closed and can provide a reliable initial ejection force at the moment of mold opening. It forms a temporal synergy with the initial parting force of the butterfly spring 121. Combined with the above-mentioned auxiliary spring 412, both the top plate 41 and the forming top block 15 that move during the mold parting process are equipped with elastic ejection components. The ejection cylinder serves as the main drive, providing a stable and controllable ejection force.

[0157] from Figure 28 As can be seen from the further embodiment, the fixed mold ejection mechanism 4 includes an upper pull rod 45 rotatably mounted on the top plate 41, and a lower pull rod 46 pulled by the upper pull rod 45 on the moving mold plate assembly. The upper pull rod 45 and the lower pull rod 46 form a separable mechanical linkage connection in the mold closed state. Specifically, the mechanical linkage connection refers to the connection between the upper pull rod 45 and the lower pull rod 46 by hooking. When the mold is opened, the lower pull rod 46 pulls the upper pull rod 45 and drives the top plate 41 and the forming top block 15 to perform an ejection action toward the moving mold core 21. The mechanical linkage connection between the lower pull rod 46 and the upper pull rod 45 is released at least at the end of the mold opening stroke and they separate from each other.

[0158] Preferably, the upper pull rod 45 separates after the lower pull rod 46 completes the pulling action during the mold opening stroke, so that the moving mold core 21 can move to the secondary position.

[0159] Specifically, it also includes an upper limit block 47 and a lower limit block 48 that are offset on both sides of the upper pull rod 45. Both the upper limit block 47 and the lower limit block 48 have chamfered surfaces on the side facing the upper pull rod 45. On this basis, the upper pull rod 45 is provided with a first side protrusion 451 and a first side concave 452 on the side where the upper limit block 47 is located, and a second side protrusion 453 and a second side concave 454 on the side where the lower limit block 48 is located.

[0160] In the closed mold state, the first side protrusion 451 slides against the upper limit block 47, and the first side concave 452 is spaced out on the upper part of the upper limit block 47; the second side concave 454 slides against the lower limit block 48, and the second side protrusion 453 is spaced out on the upper part of the lower limit block 48.

[0161] During the mold opening process, the upper pull rod 45 is pulled by the lower pull rod 46. The second side protrusion 453 slides and abuts against the end chamfer of the lower limit block 48. The first side concave 452 slides to correspond with the upper limit block 47. Under further pulling, the second side protrusion 453 abuts against the lower limit block 48. At this time, the upper pull rod 45 swings towards the upper limit block 47, and the first side concave 452 slides against the upper limit block 47. In response to the swinging action of the upper pull rod 45, the upper pull rod 46 is released. The pull-up rod 45 and the pull rod 46 are engaged to separate the upper pull rod 45 and the lower pull rod 46. At the same time, during the pulling process, the top plate 41 is driven to move towards the moving mold core 21 so that the light guide 10 is separated from the fixed mold core unit. The mold opening action itself is used as the power source to mechanically link the action of the top plate 41 with the mold opening stroke, ensuring that the ejection sequence and the mold opening process are strictly synchronized. The action is precise and reliable, without the need for external hydraulic or electrical signal control. The structure is simple, the stability is high, and the cost is lower.

[0162] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A secondary molding die for automotive headlight plastic parts with a linked core-pulling mechanism, used to form a light guide (10) in a primary molding process and a decorative shell (20) around the light guide (10) in a secondary molding process, characterized in that, include: A primary mold module (1) includes multiple mold core units and a primary mold assembly (11) that are joined together. An auxiliary core-separating assembly (12) is provided between the mold core units. The auxiliary core-separating assembly (12) is configured to separate at least two mold core units along the joining direction in response to a mold-separating action. The primary mold assembly (11) includes a first lower molding block (111) and a second lower molding block (112) at the end of the light guide (10) forming a shell connecting end. The shell connecting end at one end is configured to form a mechanical interlock with the shell (20) during secondary molding. A secondary mold module (3) includes a secondary component (31), which includes a third lower molding block (311) configured in the secondary mold to block the light guide (10) end and the decorative shell (20) end at another shell connection end. The moving module (2) includes a moving mold core (21), a slider (22) slidably disposed on the moving mold core (21), and a first core-pulling assembly (23) and a second core-pulling assembly (24) disposed opposite to each other on the moving mold core (21); In the primary type, the slider (22) forms a side connection portion of the decorative shell (20) on one side of the light guide (10) and remains engaged with the side connection portion of the decorative shell (20). In the secondary type, the slider (22) is moved away from the side of the light guide (10). The first core-pulling assembly (23) includes a first core-pulling slider (231), which has a primary molding surface (2311) that supports and shapes the light guide (10) in a primary molding, and a secondary molding surface (2312) that shapes the first undercut portion (201) on the decorative shell (20) in a secondary molding; the second core-pulling assembly (24) includes a second core-pulling slider (241), which is configured to shape a second undercut portion (202) on the decorative shell (20) in a secondary molding that is opposite to the first undercut portion (201); The primary molding surface (2311) is formed at the top of the first core-pulling slider and together with the moving mold core (21) and the primary mold fixed module (1) form the sealing surface of the primary cavity (5). The secondary molding surface (2312) is formed at the end face of the first core-pulling slider (231) and together with the moving mold core (21) and the secondary mold fixed module (3) form the sealing surface of the secondary cavity (6), so that the same first core-pulling slider (231) participates in forming the sealing surfaces of the primary cavity (5) and the secondary cavity (6) in succession.

2. The secondary molding mold for a car headlight plastic part with linked core pulling according to claim 1, characterized in that: The moving mold core (21) forms a primary cavity (5) with the primary mold fixed mold assembly (1), or forms a secondary cavity (6) with the secondary mold fixed mold assembly (3). The first core-pulling assembly (23) includes a core-pulling cylinder (232) and an inclined guide seat (233) disposed on the actuating end of the core-pulling cylinder (232). The inclined guide seat (233) is provided with a first variable diameter slide (2331). The first core-pulling slider (231) is slidably disposed on the first variable diameter slide (2331) and is held in the extended position during primary and secondary molding.

3. The secondary molding mold for a car headlight plastic part with linked core pulling according to claim 2, characterized in that: The secondary mold module (3) also includes a secondary mold core (32) and an inclined guide block (33) fixed on the secondary mold core (32). An inclined pull rod (331) is provided inside the inclined guide block (33), and a guide channel (332) matching the inclined pull rod (331) is provided inside the second core-pulling slider (241). The second core-pulling slider (241) is disposed relative to the secondary molding surface (2312) and located below the primary molding surface (2311), and the second core-pulling slider (241) is spaced outside the primary cavity (5) in the primary mold.

4. The secondary molding mold for a car headlight plastic part with linked core pulling according to claim 2, characterized in that: The fixed mold core unit includes an inner fixed core (13) and an outer fixed core (14) that are joined together at the front and rear ends, and a molding top block (15) that passes between the inner fixed core (13) and the outer fixed core (14). The forming surface of the slider (22) is embedded in the inner core (13). The primary forming surface (2311) overlaps obliquely between the outer core (14) and the moving mold core (21). The outer core (14) has a fixed side forming surface (141) inserted into the primary cavity (5). The fixed side forming surface (141) is used to form a three-dimensional leather texture light-emitting surface on the side of the light guide (10). The auxiliary core-splitting assembly (12) is set on the joint surface of the inner core (13). The auxiliary core-splitting assembly (12) is located on the opposite side of the three-dimensional leather texture light-emitting surface.

5. The secondary molding mold for a car headlight plastic part with linked core pulling according to claim 4, characterized in that: An ejector spring (113) is provided between the first lower molding block (111) and the outer core (14). The ejector spring (113) is configured to apply a force to the first lower molding block (111) to move it away from the primary cavity (5) when the mold is opened. A first slide rail (142) is provided on the outer core (14). The first lower molding block (111) is slidably connected to the first slide rail (142). The extension direction of the first slide rail (142) is configured to guide the first lower molding block (111) to move along the demolding direction of the shell connection end. The bottom of the second lower molding block (112) is provided with a first hook (1125), and the moving mold core (21) is provided with a second hook (25) that cooperates with the first hook (1125). The second hook (25) is configured to pull the second lower molding block (112) to move when the mold is opened so as to release its constraint on the shell connection end.

6. The secondary molding mold for a car headlight plastic part with linked core pulling according to claim 5, characterized in that: The inner core (13) and the outer core (14) are respectively joined at both ends. The molding top block (15) is located between the two end joint surfaces of the inner core (13) and the outer core (14). The auxiliary core-separating assembly (12) includes a butterfly spring (121) disposed on the joint surface of the inner core (13). The first lower molding block (111) and the second lower molding block (112) are respectively connected to the joint surfaces of the inner core (13) and the outer core (14). The third lower molding block (311) is embedded in the secondary mold core (32).

7. The secondary molding mold for a car headlight plastic part with linked core pulling according to claim 5, characterized in that: The primary mold module (1) is provided with a mold ejection mechanism (4). The mold ejection mechanism (4) includes a movable top plate (41) and a plurality of mold ejection units connected to the top plate (41). The top plate (41) is connected to the molding top block (15) and is configured to drive the top plate (41) and the molding top block (15) connected thereto to move in the demolding direction in response to the mold opening action of the primary mold module (1) and the moving module (2) to separate the light guide (10) from the mold core unit.

8. The secondary molding mold for a car headlight plastic part with linked core pulling according to claim 7, characterized in that: The primary molding module (1) includes a primary molding template group (16), the top plate (41) is housed in the primary molding template group (16) and moves within it, and the top plate (41) is connected to the molding top block (15) by a top rod (42). The fixed mold ejection unit includes an ejector cylinder (44) fixed on the primary mold fixed mold plate group (16), an ejection spring (43) abutting between the primary mold fixed mold plate group (16) and the top plate (41), and a tie rod group connected between the moving mold group (2) and the top plate (41). The actuating end of the ejector cylinder (44) is connected to the top plate (41). The ejection spring (43) applies a force to the top plate (41) in the direction of the moving mold core (21). The tie rod group pulls the top plate (41) toward the moving mold core (21) at least during the mold opening action.

9. The secondary molding mold for a car headlight plastic part with linked core pulling according to claim 1, characterized in that: The second lower molding block (112) is provided with a first connecting molding part (1121) that matches the open end (101) of the light guide (10), and the third lower molding block (311) is provided with a second connecting molding part (3111) that matches the open end (101) of the light guide (10) and the end of the decorative shell (20). The open end (101) of the light guide (10) is recessed into the second connecting molding part (3111).

10. A secondary molding mold for a car headlight plastic part with linked core pulling according to claim 2, characterized in that: The moving mold core (21) is provided with a connecting seat (26) arranged along the length direction of the light guide (10) in the middle. The connecting seat (26) abuts against the primary mold module (1) and the secondary mold core (32) in the closed mold state and cancels the mold opening gap. The first core-pulling slider (231) and the second core-pulling slider (241) are arranged along the width direction of the light guide (10) on both sides of the decorative shell (20) corresponding to the light guide (10). The core-pulling cylinder (232) and the inclined guide seat (233) are arranged at the lower part of the connecting seat (26). The slider (22) is arranged in the middle of the light guide (10).

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