Secondary forming die for vehicle lamp thick-wall light guide member with movable die composite slider

Abstract

The application discloses a two-step forming die of a thick-wall light guide piece of a vehicle lamp with a movable die composite slider, which comprises a primary die fixed die module, a secondary die fixed die module and a movable die module, the movable die module comprises a movable die plate group and a movable die core, the movable die core is provided with a slider, the slider extends into a primary die cavity at a primary die position, the primary die fixed die module comprises an inner fixed core, the slider is provided with a matching groove, and the inner fixed core is in abutment with a first groove wall of the matching groove; an auxiliary core separation assembly is arranged on a closed die joint surface of the inner fixed core, the auxiliary core separation assembly comprises a butterfly spring, and the butterfly spring provides an inward force to the inner fixed core to make the inner fixed core deviate from the primary die cavity when the primary die is opened; the secondary die fixed die module comprises a secondary die fixed die core, the secondary die fixed die core is in abutment with a second groove wall of the matching groove, and the secondary die fixed die core keeps the slider at a secondary die position, so that a joint surface of the inner fixed core and an adjacent fixed die core component is separated, and then the thick-wall light guide piece is actively separated from the primary die fixed die module to remove the adhesion force.

Description

Technical Field

[0001] This invention relates to the field of automotive lamp light guide technology, specifically to a secondary forming mold for a thick-walled automotive lamp light guide with a moving mold composite slider. Background Technology

[0002] To meet complex optical effects and aesthetic requirements, modern automotive headlights generally employ a two-stage molding technology. This process first forms a thick-walled light guide in a primary mold, then moves this light guide with a moving module to a secondary molding station, where a decorative shell is formed on the light guide. During this process, it is necessary to ensure that the light guide formed in the primary stage can be stably fixed on the moving mold core to smoothly complete the station switching and provide a precise molding position for the secondary molding.

[0003] During the molding process, it is necessary to ensure the optical performance and structural strength of the light guide. Usually, the wall thickness of the light guide is increased. However, thick-walled light guides have higher requirements for molds. In particular, when the thick-walled light guides are opened in the first mold, they are prone to sticking to the first mold due to the excessive expansion force of the light guide.

[0004] In the prior art, an ejection mechanism is usually set on the primary mold to eject the light guide onto the moving mold core when the mold is opened. On the one hand, it is difficult to eject the light guide by means of the ejection mechanism when the light guide and the primary mold are pressed together, and the position of the ejected light guide on the moving mold core cannot be guaranteed. On the other hand, forcibly ejecting the light guide by means of the ejection mechanism may damage the surface of the light guide.

[0005] In addition, existing technologies also employ complex pneumatic and hydraulic mechanisms to assist in fixing products, but this increases the complexity of the mold, manufacturing costs, and control difficulties. Some solutions attempt to set simple slider structures on the moving mold side, but these are usually single-function, either only used for lateral core pulling in primary molds or only for sealing in secondary molds, making it difficult to be compatible with the holding and molding of thick-walled light guides in secondary molds. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a secondary forming mold for a thick-walled light guide component for automotive lamps with a moving mold composite slider.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a secondary forming mold for a thick-walled light guide component of a car lamp with a moving mold composite slider, comprising a primary mold module, a secondary mold module, and a moving mold module. The moving mold module and the primary mold module are closed to form a primary cavity, and the moving mold module and the secondary mold module are closed to form a secondary cavity. The moving mold module comprises a moving mold plate group and a moving mold core disposed therein. The moving mold core is provided with a movable slider. The slider forms the forming surface of the protrusion feature on the side of the light guide component. The slider has a primary mold position in the primary molding and mold opening cycle, and a secondary mold position in the secondary molding that is away from the light guide component and spaced out from the secondary cavity. The slider extends into the primary cavity in the primary mold position and applies a holding force to the protrusion feature. The primary mold module comprises an inner core that forms the primary cavity. The slider is provided with an open mating groove. The inner core abuts against the first groove wall of the mating groove and holds the slider in the primary mold position.

[0008] An auxiliary core-separating assembly is disposed on the closed mold mating surface of the inner core. The auxiliary core-separating assembly includes at least a plurality of butterfly springs acting on the closed mold mating surface. The butterfly springs are compressed in the closed mold state and provide a force to the inner core to deviate from the primary cavity when the mold is opened in one step. The inner core is engaged with the first groove wall at an angle and releases a gap that allows the inner core to deviate in response to the mold opening action.

[0009] The secondary mold module includes a secondary mold core that forms a secondary cavity. The secondary mold core abuts against the second groove wall of the mating groove and keeps the slider in the secondary position. The inner core is spaced apart from the second groove wall in the primary position.

[0010] Furthermore, the secondary cavity is used to form a decorative shell on the periphery of the light guide, and the protrusion feature is formed on the side of the light-transmitting surface of the light guide. The protrusion feature is placed in the secondary cavity at the secondary position and is located within the forming coverage area of ​​the decorative shell.

[0011] Furthermore, the slider includes a forming side protrusion for forming the protrusion feature, and a supporting surface connected to the forming side protrusion. The inner core abuts against the supporting surface in the closed mold state. The inner core and the supporting surface are engaged at an angle. The slider is disposed at a secondary position spaced apart from the secondary cavity.

[0012] Furthermore, the inner core is provided with a first protrusion that is inserted into the mating groove. The first protrusion pushes against the first groove wall as the mold closes, so as to keep the slider in the one-time mold position.

[0013] The secondary mold core is provided with a second protrusion inserted into the mating groove. The slope of the second groove wall is less than the slope of the supporting surface. The second protrusion abuts against the second groove wall and forces the slider away from the secondary cavity. The secondary mold core is provided with a secondary forming part that is separated between the forming side protrusion and the light guide.

[0014] Furthermore, the first groove wall and the second groove wall are inclined in opposite directions, and the first groove wall is inclined in a direction close to the light guide, while the second groove wall is inclined in a direction away from the light guide.

[0015] Furthermore, the primary mold module includes a primary mold core assembly, which includes an outer mold core disposed opposite to the inner mold core, and a molding top block disposed between the inner mold core and the outer mold core. In the closed mold state, the inner mold core and the outer mold core, as well as the inner mold core and the molding top block, form a closed mold engagement surface. The butterfly spring is disposed along the contour end of the inner mold core.

[0016] Furthermore, the primary mold module includes a primary mold template for accommodating the primary inner core, and an offset gap is provided between the inner core and the primary mold template. The offset gap allows the inner core to be offset away from the primary cavity under the action of the butterfly spring.

[0017] The moving mold core is provided with a connecting seat opposite to the inner fixed core, and the inner fixed core is provided with a connecting block opposite to the connecting seat. The connecting seat and the connecting block abut against each other during the mold closing process, forcing the inner fixed core to close on the outer fixed core and the forming top block.

[0018] Furthermore, the moving mold core is provided with a sliding groove, a slide block is fixedly installed in the sliding groove, the slide block is provided with a T-shaped channel, and the bottom of the slider is provided with a T-shaped guide portion that constrains the slider to slide within the T-shaped channel.

[0019] Furthermore, the slide block has a built-in positioning spring, the end of which is provided with a positioning protrusion, and the bottom of the slider is provided with a primary positioning groove and a secondary positioning groove spaced apart. The positioning protrusion engages with the primary positioning groove in the primary position and engages with the secondary positioning groove in the secondary position.

[0020] Furthermore, the slider is provided with an air passage hole, which extends from the side of the slider away from the light guide to the second groove wall.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention provides a movable slider on the moving mold core, the slider having a primary shape position and a secondary shape position on the moving mold core;

[0022] During the primary molding process, the forming side protrusion on the slider constructs the forming position of the protruding feature on the side of the light guide in the primary cavity. Furthermore, this protruding feature is located on the light guide at the position used to form the decorative shell. After the secondary molding is completed, the decorative shell covering the periphery of the light guide will completely cover the protruding feature. Therefore, the protruding feature does not affect the product shape. At the same time, this design cleverly combines the process logic of secondary molding. This protruding feature not only provides a positioning function for the light guide on the moving mold core, reducing its sway in the length direction, but also increases the joint area between the decorative shell and the light guide, improving the integration of the two.

[0023] After the first molding is completed, the mold opening action of the first molding is performed. The moving mold assembly and the first molding fixed mold assembly first separate under the mold opening force of the injection molding machine. At this time, the pre-compressed disc spring is released, providing the initial parting force at the moment of mold opening, so that the joint surface of the inner fixed core and the adjacent fixed mold core component is separated, thereby actively breaking the adhesive force between the thick-walled light guide and the first molding fixed mold assembly. At the same time, the slider effectively holds the convex feature on the side of the light guide in the first molding position, ensuring that the light guide can be stably retained on the moving mold core after demolding. During the process of the moving mold assembly transferring to the second molding position, the slider remains in the molding position. At this time, the slider keeps pressing on the convex feature, effectively avoiding the positional displacement or shaking of the light guide during the transfer process, ensuring its accurate positioning in the second molding cavity, providing a reliable foundation for the injection molding of the shell, so that the shell can accurately cover the preset area of ​​the light guide, further strengthening the joint strength and structural consistency of the two, and improving the overall molding quality and assembly accuracy of the thick-walled light guide of the car headlight. Attached Figure Description

[0024] 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;

[0025] Figure 2 This is a schematic diagram of the structure of the secondary fixed mold module and the moving mold module of the present invention;

[0026] Figure 3 This is a cross-sectional view of the primary cavity of the present invention;

[0027] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0028] Figure 5 This is a cross-sectional view of the secondary cavity of the present invention;

[0029] Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle;

[0030] Figure 7 This is a cross-sectional view of the fixed mold core unit of the present invention;

[0031] Figure 8 For the present invention Figure 7 Enlarged view of point C in the middle;

[0032] Figure 9 This is an exploded view of the slider of the present invention;

[0033] Figure 10 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.

[0034] Figure 11 This is a cross-sectional view of the auxiliary core-splitting assembly between the inner and outer cores of the present invention.

[0035] Figure 12 This is an exploded view of the one-time molding core assembly of the present invention;

[0036] Figure 13 This is an exploded view of the primary mold core assembly of the present invention from another angle;

[0037] Figure 14 This is a schematic diagram of the overall structure of the fixed mold core unit of the present invention;

[0038] Figure 15 This is a cross-sectional view of the coupling seat in the primary form of the present invention;

[0039] Figure 16 This is a schematic diagram of the structure after the primary molding template of the present invention has been removed;

[0040] Figure 17 This is a schematic diagram of the structure of the push rod in the primary form of the present invention;

[0041] Figure 18 For the present invention Figure 17 Enlarged view of point D in the middle;

[0042] Figure 19 For the present invention Figure 1 Enlarged view at point E in the middle;

[0043] In the diagram: 1. Primary mold fixing module; 11. Inner core; 111. First protrusion; 112. Closed mold mating surface; 113. Joint block; 12. Auxiliary core splitting assembly; 121. Butterfly spring; 122. Core splitting push block; 1221. Through hole; 123. Guide screw; 1231. Cylindrical part; 124. Movement clearance; 13. Primary mold fixing plate; 131. Activity space; 14. Offset clearance; 15. Outer core. 16. Molding top block; 161. Second limiting step; 17. Inner molding surface; 18. Ejection channel; 181. Ejection gap; 182. First limiting step; 2. Secondary mold assembly; 21. Secondary mold core; 211. Second protrusion; 213. Secondary molding part; 3. Moving mold assembly; 31. Moving core; 311. Sliding groove; 312. Slide block; 313. T-slot; 32. Connecting seat; 4. 5. Primary cavity; 6. Secondary cavity; 7. Slider; 8. Mating groove; 9. First groove wall; 10. Second groove wall; 11. Molding side protrusion; 12. Concave molding part; 13. Pressing surface; 24. Supporting surface; 35. T-shaped guide part; 46. Positioning spring; 57. Positioning protrusion; 68. Primary positioning groove; 79. Secondary positioning groove; 80. Vent hole; 91. Fixed mold ejection mechanism; 102. Top plate; 711. Transmission block; 712. Auxiliary spring; 72. Ejector rod; 73. Ejection spring; 74. Ejection cylinder; 75. Upper pull rod; 751. First side protrusion; 752. First side concave; 753. Second side protrusion; 754. Second side concave; 76. Lower pull rod; 77. Upper limit block; 78. Lower limit block; 79. Mold parting rod; 791. Mold parting spring; 10. Light guide; 101. Protrusion feature; 20. Decorative shell. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] like Figure 1-2As shown, the secondary molding mold for a thick-walled light guide component for automotive lamps with a moving mold composite slider includes a primary mold module 1, a secondary mold module 2, and a moving mold module 3. The primary mold module 1 and the secondary mold module 2 are arranged opposite to each other. In the mold-open state, the moving mold module 3 performs injection molding action facing the primary mold module 1 or facing the secondary mold module 2 through the rotation device in the injection molding machine.

[0047] The moving mold module 3 and the primary fixed mold module 1 close to form a primary cavity 4, and form a thick-walled light guide 10. The moving mold module 3 and the secondary fixed mold module 2 close to form a secondary cavity 5, and form a decorative shell 20 surrounding the thick-walled light guide 10. The main difference between the primary fixed mold module 1 and the secondary fixed mold module 2 lies in the different structural design and molding function positioning of the cavity. The cavity of the primary fixed mold module 1 is adapted to the three-dimensional contour of the thick-walled light guide 10. The cavity of the secondary fixed mold module 2 is set around the thick-walled light guide 10 that has been formed on the moving mold module 3, and the shape of the cavity needs to match the enclosing structure of the decorative shell 20.

[0048] from Figures 3 to 6 It can be seen that the moving mold module 3 includes a moving mold plate group and a moving mold core 31 set therein. The moving mold core 31 is provided with a movable slider 6. The position switching of the slider 6 is reflected in the cooperation between the moving mold module 3 and the primary mold fixed mold module 1, and the cooperation between the moving mold module 3 and the secondary mold fixed mold module 2. That is, during any mold opening action of the moving mold core 31, the slider 6 does not move relative to the moving mold core 31. Only when closing, the slider 6 is driven to move on the moving mold core 31 by the primary mold fixed mold module 1 or the secondary mold fixed mold module 2.

[0049] The slider 6 has a forming surface for forming a protrusion feature 101 on the side of the light guide 10. The protrusion feature 101 avoids the light-emitting surface and the light-receiving surface of the light guide 10 and is located on the forming area of ​​the shell 20. The slider 6 has a primary mold position. In the primary mold position, the slider 6 extends into the primary cavity 4 under the action of the primary mold fixed mold assembly 1 and forms the protrusion feature 101. During the primary mold opening cycle, the slider 6 always remains in the primary mold position and applies a holding force to the protrusion feature 101 to hold the light guide 10 on the surface of the moving mold core 31.

[0050] The slider 6 also has a secondary position. In the secondary position, the slider 6 retracts and moves away from the light guide 10 under the action of the secondary mold module 2, and a space of secondary cavity 5 is spaced out on the outside of the protrusion feature 101 of the light guide 10. That is, the slider 6 makes room for the decorative shell 20 to be formed on the protrusion feature 101. In other words, the slider 6 does not participate in the forming of the decorative shell 20 in the secondary position.

[0051] The aforementioned primary form position specifically refers to the position during the first molding process, while the secondary form position specifically refers to the position during the second molding process, and does not refer to slider 6 alone.

[0052] from Figure 7 and Figure 8 As can be seen from the diagram, the primary mold module 1 includes an inner core 11 that constitutes the primary cavity 4. The inner core 11 refers to the mold core component that is close to the inside of the primary cavity 4. The slider 6 is provided with an open mating groove 61. During the mold closing process, the inner core 11 abuts against the first groove wall 611 of the mating groove 61 and pushes the slider 6 to the primary mold position. In the mold closing state, the inner core 11 keeps the slider 6 in the primary mold position.

[0053] As a thick-walled light guide 10, the slider 6 needs to hold the light guide 10 during the initial mold opening to keep the light guide 10 on the surface of the moving mold core 31. The problem is that the light guide 10 and the surface of the primary mold fixed mold assembly 1 are pressed together, making it difficult to separate from the primary cavity 4 without damaging the surface of the light guide 10.

[0054] Therefore, the primary mold module 1 is improved to release the tightness of the light guide 10 in the primary cavity 4.

[0055] Reference Figures 10 to 13 As shown, the primary mold module 1 also includes at least one mold core unit, which is used to overlap with the inner mold core 11 to form a primary cavity 4. The overlapping surface of the mold core unit and the inner mold core 11 in the mold-closed state is defined as the mold-closed joint surface 112. Auxiliary core-separating components 12 are respectively arranged on the mold-closed joint surface 112 of the inner mold core 11. The auxiliary core-separating components 12 include at least a plurality of butterfly springs 121 acting on the mold-closed joint surface 112. The butterfly springs 121 are arranged between two opposite mold-closed joint surfaces 112. The butterfly springs 121 are compressed in the mold-closed state. The compression force of the butterfly springs 121 mainly comes from the limiting force of the moving mold module 3 on the inner mold core 11 when the mold is closed.

[0056] During the initial mold opening cycle, the butterfly spring 121 provides a force to the inner fixed core 11, causing it to deviate from the primary cavity 4. When the moving mold module 3 separates from the primary fixed mold module 1, this force pushes the inner fixed core 11 to produce a slight displacement relative to the fixed mold core unit, thereby releasing the light guide 10 from its tight position within the primary cavity 4 and effectively solving the problem of the thick-walled light guide 10 sticking to the primary cavity 4. At the same time, the moving mold module 3 drives the slider 6 to separate from the inner fixed core 11 in the mold opening direction, allowing the light guide 10 to be smoothly separated from the primary cavity 4 without damaging the surface of the light guide 10.

[0057] Specifically, the inner core 11 and the first groove wall 611 are in a beveled fit. In the closed mold state, the moving mold module 3 drives the slider 6 to close to the inner core 11, so that the inner core 11 and the first groove wall 611 are tightly fitted together. The beveled fit between the two provides a component for the inner core 11 in the setting direction of the butterfly spring 121, thereby releasing a gap that allows the inner core 11 to deviate in response to the mold opening action. When the mold is opened in one step, as the separation gap between the slider 6 and the inner core 11 is generated, the butterfly spring 121 pushes the inner core 11 open. Preferably, the inner core 11 is still in contact with the surface of the slider 6 under the action of the butterfly spring 121, thus preventing the inner core 11 from moving too far. Of course, this limiting effect of movement can also be achieved by the fixed mold module 1 in one step, for example, by setting a limiting surface in the separation direction of the inner core 11.

[0058] like Figures 5 to 6 As shown, the secondary mold module 2 includes a secondary mold core 21 that forms the secondary cavity 5. The secondary mold core 21 abuts against the second groove wall 612 of the mating groove 61 and keeps the slider 6 in the secondary position. The inner core 11 is spaced apart from the second groove wall 612 in the primary position. That is, the mating groove 61 of the slider 6 has a first groove wall 611 and a second groove wall 612 inside. The first groove wall 611 and the second groove wall 612 serve as the internal boundaries of the mating groove 61. In the primary molding process, the inner core 11 abuts only against the first groove wall 611. In the secondary molding process, the secondary mold core 21 abuts only against the second groove wall 612.

[0059] It is worth mentioning that the interval between the inner core 11 and the second groove wall 612 provides space for the slight displacement of the inner core 11 during the mold opening process. This space is preferably matched with the stroke space of the inner core 11 actuated by the butterfly spring 121, ensuring that the light guide 10 can be smoothly separated from the primary cavity 4.

[0060] In this embodiment, during the initial mold opening, the auxiliary core-separating assembly 12 provides an initial parting force, actively pushing the inner core 11, which is held tightly on the light guide 10, away from the primary cavity 4, so that the mutually holding closed mold mating surfaces 112 separate. At the same time, the slider 6, with the movement of the moving mold module 3, applies a holding force to the protrusion feature 101 of the light guide 10 at the primary mold position. The slider 6 and the butterfly spring 121 work together to effectively overcome the huge clamping force generated by the high holding pressure of the thick-walled light guide 10, so that the light guide 10 can be smoothly and without damage detached from the fixed mold and stably remain in the moving mold. Furthermore, during the process of the moving mold module 3 carrying the light guide 10 to the secondary mold station, the slider 6 always remains in the primary mold position and presses the light guide 10 to prevent it from shifting or shaking during the transfer, thus ensuring the positioning accuracy of the light guide 10 in the secondary cavity 5.

[0061] For ease of description, the location of the primary mold module 1 is defined as the upper part of the moving mold module 3, the length direction of the light guide 10 is defined as the front-to-back direction, and the width direction of the light guide 10 is defined as the left-to-right direction.

[0062] Further integration Figure 8 As shown, as a further embodiment of the slider 6 and the protruding feature 101 on the light guide 10, the secondary cavity 5 is used to form the decorative shell 20 on the periphery of the light guide 10. The protruding feature 101 is formed on the side of the light-transmitting surface of the light guide 10, thereby avoiding the influence of the protruding feature 101 on the light-transmitting surface. The protruding feature 101 is placed in the secondary cavity 5 at the secondary molding position and is located within the molding coverage area of ​​the decorative shell 20, ensuring that the protruding feature 101 on the light guide 10 is completely covered by the decorative shell 20 after secondary molding, making the final product continuous and beautiful in appearance, and not affecting the optical performance of the headlight. From the perspective of primary molding demolding, the protruding feature 101, as the action point of the slider 6, is the basis for achieving mechanical retention, 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.

[0063] Specifically, the slider 6 includes a molded side protrusion 62 for forming the protrusion feature 101. The molded side protrusion 62 is embedded in the inner core 11 and connects with the molded surface of the inner core 11 to form the side molding surface of the primary cavity 4. The end face of the molded side protrusion 62 is provided with a concave molding portion 621. The opening direction of the concave molding portion 621 is directly opposite to the movement direction of the slider 6 from the secondary molded position to the primary molded position. The protrusion feature 101 on the light guide 10 is formed by the concave molding portion 621. Thus, the upper end surface of the concave molding portion 621 forms a pressing surface 622. The pressing surface 622 applies a holding force to the light guide 10, thereby holding the light guide 10 on the moving mold core 31.

[0064] During the primary molding process, the precise positioning of the slider 6 establishes the molding foundation for the protruding feature 101. 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 assembly consistency of the light guide 10 and the decorative shell 20 assembly and overall production efficiency. Furthermore, since the presence of the protruding feature 101 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 decorative shell 20 and the light guide 10 during the secondary molding stage, further enhancing the structural stability of the product.

[0065] Furthermore, the slider 6 also includes a support surface 63 connected to the molding side protrusion 62. The inner core 11 abuts against the support surface 63 in the mold closed state. The inner core 11 and the support surface 63 are engaged at an angle, and the slider 6 is positioned at a distance from the secondary cavity 5 in the secondary mold position.

[0066] Among them, the support surface 63 is set to be composed of multiple inclined surfaces, thereby forming a stable mechanical locking during the first mold closing, forming an additional locking force on the slider 6, 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 placement in the moving mold core 31.

[0067] In addition, the support surface 63 is set opposite to the inclined surface of the first groove wall 611, so that during the one-time mold closing process, as the inner core 11 pushes against the first groove wall 611, the support surface 63 and the inner core 11 gradually come into contact, thereby ensuring the stability of the slider 6 in the one-time position.

[0068] As a further embodiment of the inner core 11 cooperating with the slider 6, the inner core 11 is provided with a first protrusion 111 inserted into the mating groove 61. The first protrusion 111 moves toward the mating groove 61 with the mold closing action, and pushes and holds the slider 6 in the one-time mold position through the first groove wall 611. The first protrusion 111 is provided with an inclined surface facing the first groove wall 611, and the surface of the first protrusion 111 facing the second groove wall 612 is spaced apart from the second groove wall 612.

[0069] The secondary mold core 21 is provided with a second protrusion 211 inserted into the mating groove 61, and the second protrusion 211 abuts against the second groove wall 612 and forces the slider 6 away from the secondary cavity 5. The secondary mold core 21 is provided with a secondary forming part 213 separated between the forming side protrusion 62 and the light guide 10. In the secondary mold closed state, the moving mold core 31 closes on the secondary forming part 213.

[0070] It should be noted that the inclined surface engagement between the inner core 11 and the slider 6 not only converts the vertical force during mold closing into a horizontal component along the direction of the first groove wall 611, making the movement of the slider 6 smoother and more stable, but also avoids instantaneous impact through the gradual contact of the inclined surfaces. Furthermore, the spacing between the first protrusion 111 and the second groove wall 612 effectively prevents accidental contact between the inner core 11 and the second groove wall 612 during mold closing, ensuring that the slider 6 accurately reaches the primary mold position only under the guidance of the first groove wall 611, thus providing support for the subsequent contact between the mold surface 63 and the inner core 111. The tight fit of the core 11 provides a foundation and further improves the structural reliability of the mold in the primary molding stage. When the primary molding is completed and the mold opening stage is entered, as the moving mold module 3 moves backward, the first protrusion 111 gradually disengages from the mating groove 61, and its pushing action with the first groove wall 611 is released. The slider 6 can smoothly switch to the secondary molding position under the drive of the second protrusion 211. Throughout the process, the first protrusion 111 and the second groove wall 612 always maintain a distance and will not interfere with the position switching of the slider 6, thus ensuring the smoothness of the mold state switching before secondary molding.

[0071] In this embodiment, the inclination directions of the first groove wall 611 and the second groove wall 612 are opposite to each other, and the first groove wall 611 is inclined in the direction close to the light guide 10, while the second groove wall 612 is inclined in the direction away from the light guide 10, so that the cross section of the mating groove 61 is approximately V-shaped, and the mating groove 61 is flared in the direction of mold closing, which is conducive to the insertion of the first protrusion 111 or the second protrusion 211 into it.

[0072] Furthermore, the slope of the second groove wall 612 is less than that of the supporting surface 63. During the secondary molding process, because the supporting surface 63 has a larger slope, when the slider 6 is driven by the second protrusion 211 to switch to the secondary molding position, the contact tendency between the secondary molding core 21 and the supporting surface 63 is preferentially offset by the inclined guide of the second groove wall 612. The frictional force of the second protrusion 211 on the slider 6 is concentrated on the second groove wall 612, rather than directly acting on the mating area of ​​the supporting surface 63. This optimization of the force path not only minimizes the frictional loss between the supporting surface 63 and the secondary molding core 21, protecting the accuracy of the supporting surface 63, but also allows the slider 6 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 63, reduces the grinding or repair work of the support surface 63 in the subsequent maintenance of the mold, and helps to maintain the stability of the mold in the long-term production process. In addition, since the second groove wall 612 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 of the car lamp.

[0073] like Figure 4 , Figure 6 and Figure 8 As shown, as a further improvement to the slider 6, the slider 6 is provided with an air passage hole 69. The air passage hole 69 extends from the side of the slider 6 away from the light guide 10 to the second groove wall 612. During the one-time mold opening process, as the butterfly spring 121 drives the inner core 11 to offset action and the moving mold module 3 separates, the inner core 11 and the slider 6 can separate and generate an air passage gap. This air passage gap is connected to the air passage hole 69, 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.

[0074] The moving mold core 31 is provided with a sliding groove 311 for accommodating the slider 6. The sliding groove 311 is located on the surface of the moving mold core 31, and a space for the slider 6 to move is provided in the sliding groove 311. When the mold is opened, the surface of the moving mold core 31 is released, and at the same time, the air gap is connected to the air hole 69 to complete the release of residual gas.

[0075] like Figure 9 As shown, as a further embodiment of the sliding of slider 6, a slide block 312 is fixedly provided in the sliding groove 311. The slide block 312 is provided with a T-shaped channel 313. The bottom of slider 6 is provided with a T-shaped guide part 64. The T-shaped guide part 64 is constrained to slide within the T-shaped channel 313. Specifically, the T-shaped guide part 64 refers to the protrusions provided on both sides of slider 6. The T-shaped channel 313 is composed of the protrusions provided on the upper end of slide block 312. The protrusions on slide block 312 press against the protrusions on slider 6, providing reliable guidance for the movement of slider 6. This allows slider 6 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.

[0076] Specifically, the slide block 312 has a built-in positioning spring 65, and the end of the positioning spring 65 is provided with a positioning protrusion 66. The bottom of the slider 6 is provided with a primary positioning groove 67 and a secondary positioning groove 68 spaced apart. The positioning protrusion 66 engages with the primary positioning groove 67 in the primary position and engages with the secondary positioning groove 68 in the secondary position, so as to realize the reliable switching and precise locking of the slider 6 in the primary forming and secondary forming positions, reduce the shaking or misalignment of the slider 6 during the movement, ensure the positional consistency of the slider 6 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.

[0077] The positioning spring 65 inside the slide block 312 cooperates with the primary positioning groove 67 and the secondary positioning groove 68 at the bottom of the slider 6 to form a reliable mechanical positioning. When the slider 6 is in the primary or secondary position, the positioning protrusion 66 is engaged in the corresponding positioning groove, which can effectively prevent the slider 6 from moving unexpectedly under vibration or external force interference, ensuring the stability of the light guide 10 after the primary demolding and the accuracy of the cavity size during secondary molding.

[0078] When the slider 6 slides to the primary mold position under the drive mechanism, the positioning spring 65 pushes the positioning protrusion 66 into the primary mold positioning groove 67, providing a stable position constraint for the slider 6. When the slider 6 moves to the secondary mold position, the positioning protrusion 66 is engaged in the secondary mold positioning groove 68 under the action of the positioning spring 65, ensuring that the slider 6 maintains a fixed posture during the secondary molding process, effectively preventing the slider 6 from being displaced due to injection pressure or mechanical vibration, thereby ensuring the dimensional accuracy and structural consistency of the secondary molding of the thick-walled light guide 10 of the car lamp. At the same time, the secondary mold core 21 is placed in the space vacated by the slider 6 and constructs the secondary cavity 5.

[0079] from Figure 4As can be seen from the diagram, as a further embodiment of the primary mold core assembly, the primary mold core assembly includes an outer mold core 15 disposed opposite to the inner mold core 11, and a molding top block 16 passing through the inner mold core 11 and the outer mold core 15. The inner mold core 11, the molding top block 16 and the outer mold core 15 constitute a mold core unit, and together with the moving mold core 31, they form a primary cavity 4. The molding top block 16 and the moving mold core 31 respectively construct the light-transmitting surface of the automotive lamp plastic part. Specifically, the molding top block 16 constitutes the light-emitting surface of the thick-walled light guide 10, and the moving mold core 31 constitutes the light-incoming surface of the thick-walled light guide 10. That is, the moving mold core 31 and the molding top block 16 are disposed opposite to each other in the vertical direction and constitute the upper and lower boundaries of the primary cavity 4.

[0080] The inner core 11 and the outer core 15 respectively form two opposing inner molding surfaces 17 in the primary cavity 4. Under the action of molding and mold temperature, the inner molding surfaces 17 are tightly bound to both sides of the light-transmitting surface. That is, the inner molding surfaces 17 extend below the surface of the molding top block 16 and form the left and right boundaries of the primary cavity 4. The molding top block 16 is specifically arranged between the inner core 11 and the outer core 15, and the inner core 11 and the outer core 15 surround the sides of the molding top block 16. Therefore, in the closed mold state, the inner core 11 and the outer core 15, as well as the inner core 11 and the molding top block 16, form a closed mold joint surface 112. The closed mold joint surface 112 is tightly bound to each other under the constraint of the moving mold module 3. The butterfly springs 121 are arranged sequentially at intervals along the contour end of the inner core 11.

[0081] Combination Figures 11 to 13 As shown, the butterfly spring 121 is disposed along the end of the inner core 11 contour, specifically on the mold-closing mating surface 112 where it meets the outer core 15 and the molding top block 16. This arrangement makes the parting force provided during mold opening more evenly distributed. This uniform initial parting force helps the thick-walled light guide 10 to smoothly and synchronously detach from the primary mold core assembly 1, reducing the sticking time of the light guide 10 within the primary mold core assembly; effectively preventing product deformation or damage due to excessive local sticking force, and providing a prerequisite for the slider 6 to hold the light guide 10 on the moving mold core 31.

[0082] from Figure 11As can be seen, 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 end of the butterfly spring 121 abuts against the inner core 11 and the outer core 15, as well as the relative mold-closing mating surface 112 of the inner core 11 and the molding top block 16. The core-separating push block 122, as the force transmission medium of the butterfly spring 121, provides a reliable pushing surface for the auxiliary core-separating assembly 12, 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 mating surfaces that need to be separated in the inner core 11, the outer core 15, and the molding top block 16, ensuring the effectiveness and controllability of the auxiliary core-separating action.

[0083] 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 butterfly spring 121. 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 skewing 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 butterfly spring 121, thereby sensitively and smoothly starting the parting action and improving the response speed and reliability.

[0084] 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 1221 for the cylindrical part 1231 to pass through. The cylindrical part 1231 slides with the through hole 1221 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 1221.

[0085] Preferably, the auxiliary core-separating assembly 12 located at the lower ends of the mold-closing mating surface 112 of the inner core 11 and the outer core 15 is fixedly connected to the outer core 15 with its lead screw 123 fixedly connected to the outer core 15, and the core-separating push block 122 is at least partially embedded in the outer core 15, and the core-separating push block 122 abuts against the mold-closing mating surface 112 of the inner core 11.

[0086] The auxiliary core-separating assembly 12 located between the inner core 11 and the molding top block 16 is provided at both ends of the upper part of their respective mold-closing mating surfaces 112. The difference is that its guide screw 123 is fixed on the mating surface of the inner core 11, and the core-separating push block 122 is at least partially embedded in the mold-closing mating surface 112 of the inner core 11. The core-separating push block 122 abuts against the molding top block 16.

[0087] 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, when the guide screw 123 is located at the diagonal end of the core-splitting push block 122, the guide screw 123 is arranged outside the disc spring 121.

[0088] Reference Figures 3-4 Specifically, the primary mold module 1 includes a primary mold template 13 for accommodating the inner core 11. An offset gap 14 is provided between the inner core 11 and the primary mold template 13. The motion gap 124 matches the offset gap 14. The offset gap 14 provides the necessary motion space for the butterfly spring 121 to drive the inner core 11 to achieve the core separation action. The primary mold template 13 is provided with a primary mold cavity for accommodating the primary mold core assembly. The offset gap 14 allows the inner core 11 to be offset away from the primary mold cavity 4 under the action of the butterfly spring 121.

[0089] Specifically, the inner wall of the mold cavity facing the inner core 11 is inclined, and correspondingly, the corresponding surface of the inner core 11 is inclined. The offset gap 14 is located between the two inclined surfaces, so that the inner core 11 is a component that performs a separation action under the action of the butterfly spring 121 when the mold is opened. The outer core 15 and the inner core 11 are fixed components in the width direction. In the closed state, the inner core 11 is tightly closed to the molding top block 16 under the action of the moving mold core 31. When the mold is opened, the inner core 11 is instantly separated from the molding top block 16 and the outer core 15 under the action of the butterfly spring 121.

[0090] Furthermore, the offset gap 14 gradually expands toward the moving mold core 31, so that when the mold is opened, the inner fixed core 11 swings under the action of the butterfly spring 121. In this way, the size of the offset gap 14 can be effectively compressed. Since the inner fixed core 11 only needs to be separated from the thick-walled light guide 10 to solve its sticking problem, setting a reasonable offset gap 14 can not only ensure the stability in the closed mold state, but also achieve the purpose of the thick-walled light guide 10 being removed from the one-time mold core assembly.

[0091] The maximum value of the offset gap 14 is matched with the gap between the first protrusion 111 and the second groove wall 612.

[0092] Based on the above, the outer core 15, as a fixed component, can be fixed in the primary mold cavity by bolts, while the inner core 11, as a movable component, needs to remain in the primary mold cavity in the mold-opening state. Therefore, the inner core 11 is fixed to the primary mold plate 13 by a limiting bolt, and the primary mold plate 13 is provided with a through hole with an inner diameter larger than the limiting bolt. The limiting bolt is threaded to the inner core 11. A gap is provided between the through hole and the outer wall of the limiting bolt. This gap matches the aforementioned offset gap 14 to allow the inner core 11 to separate at the moment of mold opening.

[0093] For the molding ejector block 16, the molding ejector block 16 is constrained to slide between the inner core 11 and the outer core 15. A fixed mold ejection mechanism 7 can be connected to the molding ejector block 16 to assist the light guide 10 in quickly holding on the moving mold core 31 during the first mold opening.

[0094] Combination Figures 14 to 15 As shown, in a further embodiment of the inner fixed core 11 and the moving mold core 31 cooperating, the moving mold core 31 is provided with a connecting seat 32 on one side of the primary cavity 4, and a connecting block 113 is provided on the surface of the inner fixed core 11. The connecting block 113 and the connecting seat 32 are arranged on the outside of the primary cavity 4. An inclined surface is provided between the connecting seat 32 and the connecting block 113 in the mold closing direction. When the mold is closed, the connecting seat 32 and the connecting block 113 abut against each other during the mold closing process, and force the inner fixed core 11 to close on the outer fixed core 15 and the molding top block 16. When the mold is opened, due to the mold opening force of the moving mold module 3 and the primary mold fixed mold module 1, the connecting block 113 separates from the connecting seat 32 in the vertical direction, thereby releasing a separation gap for the inner fixed core 11 to move away from the engagement direction, creating physical conditions for the release of the elastic force of the butterfly spring 121.

[0095] In some embodiments, the coupling seat 32 is arranged in the middle of the moving mold core 31, the number of primary cavities 4 is two and arranged on both sides of the coupling seat 32, the number of top plates 71 is one, the two primary cavities 4 are located within the projection range of the top plate 71, the number of corresponding primary mold core assemblies is two, two fixed mold cavities are provided in the primary mold template 13, and the primary mold core assemblies are disposed in the fixed mold cavities.

[0096] Specifically, the middle part of the moving mold core 31 forms a central core extending in the front-to-back direction. On both sides of the central core, there are moving mold forming surfaces for forming a primary cavity 4 with the primary mold core assembly. The central core has a gating groove connecting the left and right moving mold forming surfaces. There are multiple connecting seats 32, which are arranged sequentially at intervals along the direction of the central core.

[0097] The coupling seat 32 and the moving mold core 31 are fixedly connected by bolts. A pad is fixedly connected to the surface of the coupling seat 32 by bolts. The pad provides an inclined surface that mates with the coupling block 113. Similarly, the coupling block 113 and the inner fixed core 11 are fixedly connected by bolts. By adjusting the tightness of the bolts, the degree of engagement between the inclined surfaces of the coupling block 113 and the coupling seat 32 can be adjusted, thereby controlling the stability during mold closing.

[0098] It is worth mentioning that the aforementioned pads can also be set on the other mating surfaces of the primary mold core assembly, thereby improving the flatness of adjacent components.

[0099] like Figures 16 to 19 As shown, in some other embodiments, to further ensure that the light guide 10 is disengaged from the primary mold assembly during primary mold opening, a mold ejection mechanism 7 is preferably configured on the molding top block 16. The primary mold mold plate 13 has an active space 131 for accommodating the mold ejection mechanism 7, and a top plate 71 is provided in the active space 131. An ejector rod 72 is provided between the top plate 71 and the molding top block 16. The mold ejection mechanism 7 applies a force to the molding top block 16 in the direction of the moving mold core 31 by acting on the top plate 71.

[0100] It should be noted that both the fixed mold ejection mechanism 7 and the auxiliary core-separating assembly 12 operate synchronously in response to the mold opening and separation gap between the primary fixed mold module 1 and the moving mold module 3.

[0101] from Figure 4 As can be seen from the diagram, as a further explanation of the primary mold core assembly, an ejection channel 18 is formed between the inner mold core 11 and the outer mold core 15 to accommodate and guide the movement of the molding ejector block 16. The ejection channel 18 is located between the mating surfaces of the inner mold core 11 and the outer mold core 15. The molding ejector block 16 is provided with at least one second limiting step 161 in the direction facing the primary cavity 4. A first limiting step 182 is provided within the ejection channel 18 to cooperate with the second limiting step 161. The first limiting step 182 constitutes... On the inner walls of the inner core 11 and the outer core 15, the forming top block 16 is fixedly connected to the top plate 71 by the ejector rod 72 passing through the primary forming template 13; the mold ejection mechanism 7 acts on the top plate 71 in the mold closed state to limit the forming top block 16 to the forming position; when the forming top block 16 is in the forming position, a predetermined ejection gap 181 is formed between its lower end and the bottom surface of the ejection channel 18, and the ejection gap 181 is specifically formed between the second limiting step 161 and the first limiting step 182.

[0102] It is worth mentioning that when the fixed mold ejection mechanism 7 and the auxiliary core-separating assembly 12 work synchronously, the ejection gap 181 forms a certain cavity structure in the ejection channel 18, thereby causing the inner fixed core 11 and the forming top block 16 to undergo micro-motion separation under the initial component force of the butterfly spring 121, thus relieving the pressure in the ejection channel 18 in advance and initially loosening the thick-walled light guide 10.

[0103] Combination Figure 18 As shown, specifically, one end of the push rod 72 is fixedly connected to the top plate 71, and the other end of the push rod 72 is provided with a transmission block 711. The transmission block 711 is T-shaped and embedded in the top of the forming top block 16, thereby realizing the transmission connection between the push rod 72, the forming top block 16 and the top plate 71.

[0104] Preferably, an auxiliary spring 712 is sleeved at the lower end of the ejector rod 72. The auxiliary spring 712 is embedded in the lower end face of the primary mold platen 13 and abuts against the transmission block 711. This provides a preload force to the transmission block 711 and the forming ejector block 16 in the direction of the moving mold core 31 during the initial stage of mold opening. The initial component force of the auxiliary spring 712 further enhances the micro-motion separation effect between the forming ejector block 16 and the inner mold core 11, as well as the tendency of the forming ejector block 16 towards the mold opening direction. When the mold ejection mechanism 7 and the auxiliary core separation assembly 12 move synchronously, the elastic force of the auxiliary spring 712 can work together to accelerate the ejection of the forming ejector block 16 and more efficiently relieve the pressure in the channel. In addition, the auxiliary spring 712 can also play a buffering and resetting role during the mold closing process. Combined with the pull of the mold ejection mechanism 7 on the forming ejector block 16 during mold closing, it maintains the stability of the forming ejector block 16 in the mold closing position.

[0105] As a further embodiment of the top plate 71 movement, the primary mold template 13 is provided with an active space 131 for the movement of the top plate 71. The primary mold template group includes a primary upper mold template and a primary lower mold template that are joined together. An active space 131 is spaced between the primary lower mold template and the primary upper mold template. The top plate 71 is movably disposed in the active space 131.

[0106] In cases with two primary cavities 4, there is one top plate 71. Ejector pins 72 are positioned at both ends of the top plate 71 along the length of the thick-walled light guide 10. Multiple guide plugs are also provided on the top plate 71, arranged sequentially along the length of the light guide. The guide plugs pass through the top plate 71 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 71, providing precise guidance for the reciprocating movement of the top plate 71. This prevents the top plate 71 from tilting or jamming during sliding, ensuring that the ejector pins 72 exert uniform ejection force on the molding block 16. Simultaneously, the number and spacing of the guide plugs can be adjusted according to the length of the thick-walled light guide and the distribution of the primary cavities 4 to further improve the stability of the top plate 71's movement. This ensures that the light guides in the two primary cavities 4 can separate synchronously and smoothly from the inner core 11 during mold opening, effectively preventing deformation or sticking of the plastic part due to uneven force on the top plate 71. In addition, the mating structure between the guide plug and the top plate 71 can reduce wear during the movement of the top plate 71, extend the service life of the mold, and ensure the long-term stable operation of the mold parting system.

[0107] like Figure 16 As shown, in this embodiment, the fixed mold ejection mechanism 7 includes an ejection spring 73 abutting against the top of the top plate 71 and the top of the movable space 131, and an ejection cylinder 74 arranged in the demolding direction. The top plate 71 is connected to the actuating end of the ejection cylinder 74. The ejection cylinder 74 is fixed on the fixed mold template of the primary mold. When the ejection cylinder 74 is in the retracted state, it pulls and holds the top plate 71 in the forming position. The ejection spring 73 is compressed in the closed mold state and applies a force to the top plate 71 in the demolding direction. The ejection cylinder 74 is started synchronously in response to the mold opening action. The extension action of the ejection cylinder 74 drives the top plate 71 to move toward the moving mold core 31.

[0108] To ensure the positional stability of the ejector spring 73, 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 73 is placed in the primary mold upper fixed mold plate and sleeved on the positioning protrusion. The end of the ejector spring 73 extends out of the primary mold upper fixed mold plate and is embedded in the top plate 71. That is, the ejector spring 73 abuts between the primary mold upper fixed mold plate and the top plate 71. The ejector spring 73 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 712, both the top plate 71 and the forming top block 16 that move during the mold parting process are equipped with elastic ejection components. The ejector cylinder 74 serves as the main drive, providing a stable and controllable ejection force.

[0109] like Figure 19As shown, in a further embodiment, the fixed mold ejection mechanism 7 includes an upper pull rod 75 rotatably mounted on the top plate 71, and a lower pull rod 76 pulled by the upper pull rod 75 on the moving mold plate assembly. The upper pull rod 75 and the lower pull rod 76 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 75 and the lower pull rod 76 by hooking. When the mold is opened, the lower pull rod 76 pulls the upper pull rod 75 and drives the top plate 71 and the forming top block 16 to perform an ejection action toward the moving mold core 31. The mechanical linkage connection between the lower pull rod 76 and the upper pull rod 75 is released at least at the end of the mold opening stroke, and they separate from each other.

[0110] Preferably, the upper pull rod 75 separates after the lower pull rod 76 completes the pulling action during the mold opening stroke, so that the moving mold core 31 can move to the secondary position.

[0111] Specifically, it also includes an upper limit block 77 and a lower limit block 78 that are offset on both sides of the upper pull rod 75. Both the upper limit block 77 and the lower limit block 78 have chamfered surfaces on the side facing the upper pull rod 75. On this basis, the upper pull rod 75 is provided with a first side protrusion 751 and a first side concave 752 on the side where the upper limit block 77 is located, and a second side protrusion 753 and a second side concave 754 on the side where the lower limit block 78 is located.

[0112] In the closed mold state, the first side protrusion 751 slides against the upper limit block 77, and the first side concave 752 is spaced out on the upper part of the upper limit block 77; the second side concave 754 slides against the lower limit block 78, and the second side protrusion 753 is spaced out on the upper part of the lower limit block 78.

[0113] During the mold opening process, the upper pull rod 75 is pulled by the lower pull rod 76. The second side protrusion 753 slides and abuts against the end chamfer of the lower limit block 78. The first side concave 752 slides to correspond with the upper limit block 77. Under further pulling, the second side protrusion 753 abuts against the lower limit block 78. At this time, the upper pull rod 75 swings towards the upper limit block 77, and the first side concave 752 slides against the upper limit block 77. In response to the swinging action of the upper pull rod 75, the upper pull rod 75 is released. The pull-up rod 75 and the pull-down rod 76 are engaged to separate the upper pull rod 75 and the lower pull rod 76. At the same time, during the pulling process, the top plate 71 is driven to move toward the moving mold core 31 so that the light guide 10 is separated from the one-time mold core assembly. The mold opening action itself is used as the power source, and the movement of the top plate 71 is mechanically linked with the mold opening stroke. This ensures that the ejection sequence is synchronized with the mold opening process, and the action is precise and reliable. No external hydraulic or electrical signal control is required. The structure is simple, the stability is high, and the cost is lower.

[0114] The upper pull rod 75 is connected to the top plate 71 by bolts. The upper pull rod 75 is sleeved on the flat surface of the bolt, and the threaded part of the bolt is threadedly connected to the top plate 71.

[0115] like Figure 15 As shown, specifically, at least two parting rods 79 and parting springs 791 are provided between the top plate 71 and the moving template group. The parting springs 791 are set between the parting rods 79 and the top plate 71. At least two sets of cooperating parting springs 791 and parting rods 79 are provided to effectively balance the ejection force and mold opening force acting on the product at the moment of mold opening, and prevent the light guide 10 from whitening or deformation due to stress concentration on one side caused by uneven force.

[0116] As one layout of the fixed mold ejection mechanism 7, the ejection cylinder 74 corresponds to the middle position of the two primary cavities 4, specifically set at the middle position of both sides of the top plate 71. Along the length direction of the thick-walled light guide, ejection springs 73 are set on both sides of the end of each primary cavity 4. There are two ejector rods 72, which are also set at the end of each primary cavity 4. The guide plug is arranged between the two ends of the primary cavity 4. The above layout design allows the thrust of the ejection cylinder 74 to be evenly transmitted to the top plate 71 along the length direction of the thick-walled light guide. The combined ejection mode formed by the ejection springs 73 at both ends ensures the concentration of ejection power and reduces the impact at the moment of ejection through elastic buffering. The two ejector rods 72 act precisely on the key force points at the ends of the primary cavities 4; while the guide plug provides stable support and guidance along the movement trajectory of the top plate 71, preventing the top plate 71 from deflecting or jamming during the ejection process, further improving the motion accuracy and reliability of the fixed mold ejection mechanism 7. This collaborative layout of multiple components optimizes the force distribution and transmission path for the structural characteristics of thick-walled automotive headlight plastic parts, effectively reducing the risk of product damage during demolding and laying a good foundation for the smooth progress of secondary molding.

[0117] 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 a thick-walled light guide component for a car lamp with a moving mold composite slider, comprising a primary mold module (1), a secondary mold module (2), and a moving mold module (3), wherein the moving mold module (3) closes with the primary mold module (1) to form a primary cavity (4), and closes with the secondary mold module (2) to form a secondary cavity (5), wherein the moving mold module (3) comprises a moving mold plate assembly and a moving mold core (31) disposed therein, characterized in that, The moving mold core (31) is provided with a movable slider (6), the slider (6) forms the forming surface of the protrusion feature (101) on the side of the light guide (10), and the slider (6) has a primary mold position in the primary mold and mold opening cycle, and a secondary mold position in the secondary mold that is far away from the light guide (10) and spaced out from the secondary mold cavity (5). The slider (6) extends into the primary mold cavity (4) in the primary mold position and applies a holding force to the protrusion feature (101). The primary mold fixed mold module (1) includes an inner fixed core (11) that forms the primary mold cavity (4). The slider (6) is provided with a mating groove (61) that is open. The inner fixed core (11) abuts against the first groove wall (611) of the mating groove (61) and keeps the slider (6) in the primary mold position. An auxiliary core-separating assembly (12) is disposed on the mold-closed mating surface (112) of the inner core (11). The auxiliary core-separating assembly (12) includes at least a plurality of butterfly springs (121) acting on the mold-closed mating surface (112). The butterfly springs (121) are compressed in the mold-closed state and provide a force to the inner core (11) to deviate from the primary cavity (4) when the mold is opened in one step. The inner core (11) is in inclined engagement with the first groove wall (611) and releases a gap that allows the inner core (11) to deviate in response to the mold opening action. The secondary mold module (2) includes a secondary mold core (21) that forms a secondary cavity (5). The secondary mold core (21) abuts against the second groove wall (612) of the mating groove (61) and keeps the slider (6) in the secondary position. The inner core (11) is spaced apart from the second groove wall (612) in the primary position. The primary mold module (1) includes a primary mold core assembly, which includes an outer mold core (15) disposed opposite to the inner mold core (11) and a molding top block (16) passing between the inner mold core (11) and the outer mold core (15). In the closed mold state, the inner mold core (11) and the outer mold core (15), and the inner mold core (11) and the molding top block (16) form a closed mold joint surface (112). The butterfly spring (121) is disposed along the contour end of the inner mold core (11).

2. The secondary forming mold for the thick-walled light guide component of a vehicle lamp with a moving mold composite slider according to claim 1, characterized in that: The secondary cavity (5) is used to form a decorative shell (20) on the periphery of the light guide (10). The protrusion (101) is formed on the side of the light-transmitting surface of the light guide (10). The protrusion (101) is placed in the secondary cavity (5) at the secondary position and is located within the forming coverage of the decorative shell (20).

3. The secondary forming mold for the thick-walled light guide component of a vehicle lamp with a moving mold composite slider according to claim 1, characterized in that: The slider (6) includes a molding side protrusion (62) for forming the protrusion feature (101) and a support surface (63) connected to the molding side protrusion (62). The inner core (11) abuts against the support surface (63) in the mold closed state. The inner core (11) and the support surface (63) are engaged at an angle. The slider (6) is positioned at a secondary position and spaced apart from the secondary cavity (5).

4. The secondary forming mold for the thick-walled light guide component of a vehicle lamp with a moving mold composite slider according to claim 3, characterized in that: The inner core (11) is provided with a first protrusion (111) inserted into the mating groove (61). The first protrusion (111) pushes against the first groove wall (611) as the mold closes, so as to keep the slider (6) in the one-time mold position. The secondary mold core (21) is provided with a second protrusion (211) inserted into the mating groove (61). The slope of the second groove wall (612) is less than the slope of the supporting surface (63). The second protrusion (211) abuts against the second groove wall (612) and forces the slider (6) away from the secondary cavity (5). The secondary mold core (21) is provided with a secondary forming part (213) separated between the forming side protrusion (62) and the light guide (10).

5. The secondary forming mold for the thick-walled light guide component of a vehicle lamp with a moving mold composite slider according to claim 4, characterized in that: The first groove wall (611) and the second groove wall (612) are inclined in opposite directions, and the first groove wall (611) is inclined in a direction close to the light guide (10), while the second groove wall (612) is inclined in a direction away from the light guide (10).

6. The secondary forming mold for the thick-walled light guide component of a vehicle lamp with a moving mold composite slider according to claim 1, characterized in that: The primary mold module (1) includes a primary mold template (13) for accommodating the inner core (11), and an offset gap (14) is provided between the inner core (11) and the primary mold template (13). The offset gap (14) allows the inner core (11) to be offset away from the primary cavity (4) under the action of the butterfly spring (121). The moving mold core (31) is provided with a connecting seat (32) opposite to the inner fixed core (11), and the inner fixed core (11) is provided with a connecting block (113) opposite to the connecting seat (32). The connecting seat (32) and the connecting block (113) abut against each other during the mold closing process, and force the inner fixed core (11) to close on the outer fixed core (15) and the forming top block (16).

7. The secondary forming mold for the thick-walled light guide component of a vehicle lamp with a moving mold composite slider according to claim 1, characterized in that: The moving mold core (31) is provided with a sliding groove (311), and a slide block (312) is fixedly provided in the sliding groove (311). The slide block (312) is provided with a T-shaped channel (313), and the bottom of the slider (6) is provided with a T-shaped guide part (64) that is constrained to slide in the T-shaped channel (313).

8. The secondary forming mold for the thick-walled light guide component of a vehicle lamp with a moving mold composite slider according to claim 7, characterized in that: The slide block (312) has a built-in positioning spring (65), and the end of the positioning spring (65) is provided with a positioning protrusion (66). The bottom of the slider (6) is provided with a primary positioning groove (67) and a secondary positioning groove (68) spaced apart. The positioning protrusion (66) engages with the primary positioning groove (67) in the primary position and engages with the secondary positioning groove (68) in the secondary position.

9. The secondary forming mold for the thick-walled light guide component of a vehicle lamp with a moving mold composite slider according to claim 1, characterized in that: The slider (6) is provided with an air passage hole (69), which extends from the side of the slider (6) away from the light guide (10) to the second groove wall (612).

Images