Light guide injection mold

Abstract

The light guide injection mold comprises a movable mold assembly, the movable mold assembly comprises a movable mold plate provided with an inner sliding block and a plurality of insert pins, and the insert pins are arranged in the inner sliding block in a penetrating mode and are in sliding fit with the inner sliding block; the supporting plate drives the inner sliding block to move, so that the inner sliding block is separated from the connecting part on the light guide strip and the positioning column; a top plate; the ejection type movable mold core is fixedly connected to the ejection plate and provided with a cavity surface used for forming the connecting end, and when the ejection plate acts, the ejection type movable mold core is driven to move in the direction away from the movable mold plate; and the movable insert is fixedly mounted on the movable mold plate and embedded in the ejection type movable mold core, and the movable insert is provided with a tooth groove structure used for forming light distribution textures. According to the light guide injection mold provided by the invention, by introducing the design of the inner sliding block for oblique demolding, the insert pin structure for penetrating and supporting and the movable mold core for step-by-step ejection, precise protection and sequential demolding of a light guide strip connecting part, a positioning column and light distribution textures are realized, the risk of structural damage is remarkably reduced, and the demolding efficiency and the forming quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and more particularly to a light guide injection mold. Background Art

[0002] In modern automotive lighting systems, light guide strips are important components that enhance the overall vehicle appearance and lighting uniformity, and their structure and manufacturing process have attracted much attention. Figure 1-2 As shown, an automotive light guide strip structure includes three long strips of light guides, one side of the middle of which has a toothed light distribution pattern to achieve the effect of refraction and diffusion of light. A connecting end is provided at one end of the same side, and the other end is connected to the other light guides through a joint end to form a whole. The connecting end generally includes a flat mounting plate, the inner side of which is integrally formed with the outer periphery of the light guide through a connecting portion, and the end of the light guide on this side is the light source, i.e., the incident end of the light source. To achieve precise positioning, at least one positioning post is provided on the mounting plate. This positioning post protrudes from the surface of the mounting plate and is used to fix the position of the light guide strip during injection molding.

[0003] However, during the injection molding process, the structural design of the connection end can easily lead to demolding problems. Especially in the case of strong demolding, the connection part and the positioning column are very likely to break or deform due to their slender structure or concentrated force, which affects the yield and structural stability. Although CN 111890644 A discloses a seamless demolding mold suitable for automotive light guide strips, it does not involve the structural type in which the connection part and the positioning column coexist, and it is difficult to provide a direct reference for actual mold design and optimization. Therefore, for light guide strips with complex connection end structures, it is urgent to develop more targeted mold design and molding solutions. Summary of the Invention

[0004] The present invention aims to, to a certain extent, address one of the technical issues in the related art. To this end, embodiments of the present invention propose a light guide injection mold. By incorporating an inner slider for oblique demolding, a penetrating support pin structure, and a step-by-step ejection design for the movable mold core, this mold achieves precise protection and sequential demolding of the light guide strip's connecting portion, positioning columns, and light distribution textures, significantly reducing the risk of structural damage and improving demolding efficiency and molding quality.

[0005] The technical solution adopted by the present invention is to provide a light guide injection mold, including a movable mold component, characterized in that the movable mold component includes: The movable mold plate is provided with an inner slider and a plurality of inlay pins. The inlay pins are inserted into the inner slider and slidably cooperate with the inner slider. In the mold closing state, the ends of the inlay pins abut against the connecting portion of the light guide bar and the positioning column. A support plate is provided at the bottom of the movable plate and connected to the inner slider. The support plate is movable relative to the movable plate and drives the inner slider to move so as to separate the connecting portion and the positioning column on the light guide bar. roof; An ejection-type movable mold core is fixedly connected to the top plate and has a cavity surface for forming the connection end, and drives the ejection-type movable mold core to move away from the movable mold plate when the top plate moves; The movable insert is fixedly mounted on the movable platen and embedded in the ejection type movable mold core. The movable insert has a tooth groove structure for forming a light distribution texture.

[0006] With the above structure, the stress state of the light guide strip during demolding is significantly optimized. Specifically, during the initial mold opening process, the support plate drives the inner slider along a preset oblique path, allowing the inner slider to preferentially disengage from the connection portion and the positioning column without interfering with the light guide strip itself, thus avoiding structural cracking or detailed fractures caused by forced demolding. At the same time, because the inlay pin is set throughout the inner slider, it provides continuous support for the light guide strip's connection end and positioning column throughout the entire mold opening and inner slider movement process, effectively dispersing the local stress generated during demolding and significantly improving the product's demolding integrity and mold life.

[0007] Furthermore, the synchronous movement of the ejector plate drives the ejector core upward, allowing the cavity at the connection end to be lifted after the support plate moves, separating the molded part from the tooth groove and further reducing demolding resistance. This composite demolding method of first releasing the mold obliquely and then ejecting the mold axially effectively avoids the stress concentration problem caused by the separation of the connection and the positioning column in the same mold in traditional structures.

[0008] The movable insert serves as the molding carrier for the tooth-shaped light-distribution pattern in the center of the light guide. Because it is fixed to the movable platen and embedded within the movable mold core, it remains relatively stationary during the ejection process, ensuring the molding precision and integrity of the pattern structure. The nested fit between the movable insert and the ejection-type movable mold core ensures complete sealing of the cavity structure while facilitating controlled separation during demolding, avoiding scratches and damage to the optically functional area of the light guide surface, where the light-distribution pattern is located.

[0009] In summary, the present invention introduces an inner slider that can be demolded obliquely, a pin support mechanism, and a movable mold core system that can be ejected in steps into the mold structure, thereby collaboratively achieving precise demolding and protection of complex structures such as connecting parts, positioning columns, and light distribution textures. It effectively solves the structural damage problem caused by strong demolding in the prior art, improves the molding quality, demolding efficiency, and mold adaptability of the light guide strip, and is particularly suitable for the mass injection molding production of automotive light guide components with complex end structures.

[0010] According to one embodiment of the present invention, the inner slider is arranged obliquely, and a movably installed oblique rod is provided on the support plate, one end of the oblique rod is fixedly connected to the inner slider, and the oblique rod itself can be rotated to match the angle change of the oblique movement of the inner slider, so that when the support plate moves along the mold opening direction, the oblique rod drives the inner slider to slide smoothly along its set oblique trajectory, ensuring that the inner slider can quickly detach from the connecting part and the positioning column without interfering with the light guide bar body.

[0011] According to one embodiment of the present invention, a fixed block is fixedly installed on the bottom of the movable template, one end of the insert pin is fixedly connected to the fixed block, and the other end passes through the inner slider and extends into the mold cavity. During the movement of the inner slider, the insert pin remains in a fixed position, forming effective limitation and support for the connecting part and the positioning column.

[0012] According to one embodiment of the present invention, the top plate is fixedly connected to a push rod, and the end of the push rod is embedded in the inner slider. The top plate drives the push rod to move upward synchronously during the ejection stage. During this process, the end of the inlay pin is gradually separated from the connecting part of the light guide bar and the positioning column, avoiding structural damage caused by direct demolding, and effectively improving the controllability of the demolding process and the integrity of the product.

[0013] According to one embodiment of the present invention, a movable mold insert is fixedly installed on the ejection-type movable mold core, and the movable mold insert is used to form a cavity structure of the connecting end of the light guide strip.

[0014] According to one embodiment of the present invention, a plurality of ejector pins are fixedly connected to the ejector plate.

[0015] According to one embodiment of the present invention, a notch is provided at the upper end of the push rod.

[0016] According to one embodiment of the present invention, the inner sliding block is provided with a matching portion for connecting with the ejector rod, and the upper end edge of the ejector rod is embedded in the matching portion.

[0017] According to one embodiment of the present invention, during the mold opening process, the support plate is first separated from the movable mold plate, and during the separation process, it drives the inner slider to move obliquely downward; then, the top plate lifts up the ejection type movable mold core provided thereon, so that the formed light guide strip is separated from the movable insert and the insert pin, thereby realizing the smooth demolding of the light guide strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 3D is a perspective view of a light guide strip according to an embodiment of the present invention.

[0020] Figure 2 This is a partially enlarged view of the light guide strip in an embodiment of the present invention.

[0021] Figure 3 2 is a three-dimensional diagram of the movable mold assembly in an embodiment of the present invention.

[0022] Figure 4 2. It is a top view of the movable mold assembly in an embodiment of the present invention.

[0023] Figure 5 It is a cross-sectional view of line AA in an embodiment of the present invention.

[0024] Figure 6 Schematic diagram of the connection of the inner slider in an embodiment of the present invention.

[0025] Figure 7 Schematic diagram of the structure of a portion of the movable mold assembly in an embodiment of the present invention.

[0026] Figure 8 for Figure 7 A partial enlarged view of point B in the middle.

[0027] Figure 9 It is a three-dimensional diagram of the light guide strip, the ejection type movable mold core and the movable insert in an embodiment of the present invention.

[0028] Figure 10 Schematic diagram of the structure of the movable insert in an embodiment of the present invention.

[0029] Figure 11 Schematic diagram of the structure of the movable mold plate and the ejection type movable mold core in an embodiment of the present invention.

[0030] Figure 12 Schematic diagram of the structure of the movable insert in an embodiment of the present invention.

[0031] Figure 13 Schematic diagram of the connection between the ejection type movable mold core and the top plate in an embodiment of the present invention.

[0032] Description of the numbers in the figure: 10. Light guide strip; 20. Moving mold assembly; 11. Light guide; 12. Light distribution pattern; 13. Connecting end; 14. Combining end; 15. Positioning column; 11a. Enter the light source; 13a, mounting plate; 13b, connecting portion; 21. Moving mold plate; 22. Support plate; 23. Ejector plate; 24. Ejector core; 25. Movable insert; 26. Inner slide; 27. Inclined tie rod; 28. Insert pin; 29. Fixed block; 210. Ejector rod; 211. Moving mold insert; 212. Ejector pin; 25a, tooth groove; 26a, mating portion; 210a. Gap. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention. Example 1

[0034] like Figure 3-13 As shown, in this embodiment, a light guide injection mold is disclosed, including a movable mold component 20, characterized in that the movable mold component 20 includes: The movable plate 21 is provided with an inner slider 26 and a plurality of inserting pins 28. The inserting pins 28 are inserted into the inner slider 26 and slideably cooperate with the inner slider 26. In the mold closing state, the ends of the inserting pins 28 abut against the connecting portion 13b of the light guide bar 10 and the positioning column 15. The support plate 22 is provided at the bottom of the movable plate 21 and connected to the inner slider 26. The support plate 22 is movable relative to the movable plate 21. The support plate 22 drives the inner slider 26 to move so as to separate the connecting portion 13b on the light guide bar 10 and the positioning post 15. Top plate 23; The ejection type movable mold core 24 is fixedly connected to the top plate 23 and has a cavity surface for forming the connection end 13. When the top plate 23 moves, the ejection type movable mold core 24 moves in a direction away from the movable plate 21; The movable insert 25 is fixedly mounted on the movable platen 21 and embedded in the ejection movable mold core 24 . The movable insert 25 has a tooth groove 25 a structure for forming a light distribution texture.

[0035] like Figure 1-2As shown, the light guide injection mold in this embodiment is mainly used for the molding of automotive light guide strips 10. The light guide strip 10 as a whole is composed of three long strip light guides 11 arranged in a curved shape. A tooth-shaped light distribution pattern 12 structure is provided on one side of the middle part of each light guide 11 to achieve the refraction, return and diffusion of light, thereby improving the uniformity and visual perception of the light. The light distribution pattern 12 is arranged in a rack shape, and the corresponding mold cavity area is provided with a precision tooth groove 25a structure for injection molding of the light distribution texture. However, during the demolding process, due to the strong adhesion between the light distribution pattern 12 and the mold cavity surface, if the ejector pin 212 is directly used to act on this area for ejection, it is very easy to cause the light distribution structure to be squeezed and deformed at the end of the ejector pin 212, especially in areas where some of the tooth grooves 25a are formed deeper or more densely, the deformation is more significant, affecting the light guidance and reflection quality, thereby reducing the overall light guiding performance. Therefore, in order to ensure the light guiding performance and product consistency, higher requirements are placed on the molding accuracy of the light distribution pattern 12 and the protection during the demolding process.

[0036] Each light guide 11 has a connecting end 13 at one end on the same side, and the other end is connected to the adjacent light guide 11 via a coupling end 14, forming a single body. The connecting end 13 typically comprises an integrally injection-molded mounting plate 13a, the inner side of which is fused to the outer periphery of the light guide 11 via a connecting portion 13b. The light guide 11 also has a light source entrance at this end, serving as the light source 11a for the entire light guide strip 10. To achieve precise assembly positioning, at least one positioning post 15 is provided on the mounting plate 13a. This positioning post 15 protrudes from the surface of the mounting plate 13a and plays an important role in limiting the position of the light guide strip 10 and controlling the mold cavity matching accuracy during the injection molding process.

[0037] Combine Figure 5 As shown, the support plate 22 is positioned below the movable platen 21. A first parting surface is formed between the support plate 22 and the movable platen 21, while a second parting surface is formed between the movable platen 21 and the fixed platen (not shown). An inner slider 26 is obliquely mounted on the bottom of the movable platen 21, its end extending into the second parting surface and serving to define the molding area for the mounting plate 13a and the positioning posts 15. A diagonal tie rod 27 is also movably mounted on the support plate 22. One end of the diagonal tie rod 27 is fixedly connected to the inner slider 26, while the other end can swing on the support plate 22, thereby adapting to the angular changes of the slider during its oblique movement and achieving smooth sliding of the support plate 22 driven by the mold opening action.

[0038] A fixing block 29 is further installed at the bottom of the movable template 21. The fixing block 29 is used to fix one end of the inlay pin 28. The inlay pin 28 is obliquely inserted into the inner slider 26, and its distal end extends into the interior of the mold cavity. In the initial stage of mold opening, the first parting surface is first opened, and the support plate 22 and the movable template 21 are relatively separated. At this time, the inclined rod 27 drives the inner slider 26 to move along the set oblique trajectory to complete the separation operation from the connection end 13 structure of the light guide bar 10. The end of the inner slider 26 has a cavity contour for defining the mounting plate 13a and the positioning column 15, and maintains synchronous separation with the light guide during movement. At the same time, because the inlay pin 28 always passes through the slider and abuts against the positioning column 15 and the connection part 13b, it continues to form support during the demolding process, reducing the risk of deformation of this area under strong demolding conditions, and effectively improving the molding stability and dimensional consistency of the overall structure of the connection end 13.

[0039] Subsequently, the second parting surface opens, and the movable mold plate 21 is pulled apart from the fixed mold plate, leaving space for the ejection movable mold core 24 to move upward. Finally, the action of the top plate 23 drives the ejection mechanism to start, and the ejection movable mold core 24 moves upward synchronously with the top plate 23, while driving the ejector rod 210 and the ejector pin 212 to be ejected together. Figure 1 As can be seen, the surface of the finished light guide strip 10 only bears traces of ejector pins 212 in the non-light-distribution pattern 12 area. The ejection position of ejector pins 212 avoids the light-distribution functional area, ensuring that optical performance is unaffected. The ejector-type movable mold core 24 forms the cavity surface for the non-light-distribution area of the light guide body 11, while the movable insert 25 embedded within it is responsible for forming the light-distribution tooth pattern. During demolding, the ejector-type movable mold core 24 moves upward as a whole, smoothly removing the light guide strip 10 from the movable insert 25 fixed in the movable mold plate 21. The light-distribution pattern 12 area and the non-light-distribution area are separated from the tooth grooves 25a, achieving complete demolding from the optically functional surface to the non-functional surface. This demolding method is different from the traditional method in which the ejector pin 212 directly acts on the light distribution area. It adopts a large-area, non-contact separation path, which significantly reduces the concentrated stress on the light guide bar 10 during the demolding process, and the light distribution pattern 12 is less deformed, and the product consistency is higher. It is particularly suitable for the large-scale, high-precision molding needs of automotive lighting components with strict requirements on optical performance.

[0040] Specifically, combined Figure 7-8 As shown, the top plate 23 is fixedly connected to a push rod 210, the end of which is embedded in the inner slider 26. A notch 210a is provided at the upper end of the push rod 210. The inner slider 26 is provided with a mating portion 26a for connecting with the push rod 210, and the upper end edge of the push rod 210 is embedded in the mating portion 26a.

[0041] Furthermore, during the demolding phase, when the top plate 23 drives the ejector pin 210 upward, the ejector pin 210 engages with the connecting end 13 of the light guide bar 10 through its upper end, which is provided with the notch 210a. This drives the connecting end 13 upward as a whole in the mold opening direction, achieving smooth separation of the connecting end 13 from the insert pin 28 and preventing damage to the connecting portion 13b caused by strong pulling. Simultaneously, the stepped engaging portion 26a acts as a limiter during the ejector pin 210's retraction process, ensuring that the ejector pin 210 returns to the predetermined position. This facilitates precise alignment of the various components during mold closing and facilitates the smooth execution of the subsequent molding cycle.

[0042] Specifically, a movable mold insert 211 is fixedly installed on the ejection-type movable mold core 24 , and the movable mold insert 211 is used to form a cavity structure of the connecting end 13 of the light guide bar 10 .

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0045] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0047] In the description of this specification, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0048] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A light guide injection mold, comprising a movable mold assembly, characterized in that: The movable mold assembly includes: The movable mold plate is provided with an inner slider and a plurality of inlay pins. The inlay pins are inserted into the inner slider and slidably cooperate with the inner slider. In the mold closing state, the ends of the inlay pins abut against the connecting portion of the light guide bar and the positioning column. A support plate is provided at the bottom of the movable plate and connected to the inner slider. The support plate is movable relative to the movable plate and drives the inner slider to move so as to separate the connecting portion and the positioning column on the light guide bar. roof; An ejection-type movable mold core is fixedly connected to the top plate and has a cavity surface for forming the connection end, and drives the ejection-type movable mold core to move away from the movable mold plate when the top plate moves; The movable insert is fixedly mounted on the movable platen and embedded in the ejection type movable mold core. The movable insert has a tooth groove structure for forming a light distribution texture.

2. The light guide injection mold according to claim 1, characterized in that: The inner sliding block is arranged in an oblique direction, and a movably mounted oblique tie rod is provided on the supporting plate, and one end of the oblique tie rod is fixedly connected to the inner sliding block.

3. The light guide injection mold according to claim 1, characterized in that: A fixed block is fixedly installed on the bottom of the movable template, one end of the inlay pin is fixedly connected to the fixed block, and the other end passes through the inner slider and extends into the mold cavity.

4. The light guide injection mold according to claim 1, characterized in that: The top plate is fixedly connected with a top rod, and the end of the top rod is embedded in the inner sliding block.

5. The light guide injection mold according to claim 4, characterized in that: The ejection type movable mold core is fixedly installed with a movable mold insert.

6. The light guide injection mold according to claim 4, characterized in that: The top plate is fixedly connected with a plurality of ejector pins.

7. The light guide injection mold according to claim 4, characterized in that: The upper end of the push rod is provided with a notch.

8. The light guide injection mold according to claim 7, characterized in that: The inner sliding block is provided with a matching portion for connecting with the ejector rod, and the upper end edge of the ejector rod is embedded in the matching portion.

9. The light guide injection mold according to claim 1, characterized in that: During the mold opening process, the support plate is first separated from the movable mold plate, and during the separation process, it drives the inner slider to move obliquely downward; then, the top plate lifts up the ejection type movable mold core arranged thereon, so that the formed light guide strip is separated from the movable insert and the insert pin, thereby realizing the smooth demolding of the light guide strip.

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