Lampshade mold structure

Abstract

The utility model discloses a lampshade mold structure, which relates to the technical field of auto spare parts, and comprises a front mold and a rear mold, a first cavity is formed on the front mold, the front mold comprises a first flat part, and the first flat part is positioned at the edge of the first cavity; a second cavity is formed in the rear mold, the rear mold comprises a second flat part, and the second flat part is located at the edge of the second cavity. According to the technical scheme, the first flat portion and the second flat portion are adopted, the included angle C formed between the first flat portion and the second flat portion is larger than or equal to 170 degrees and smaller than or equal to 177 degrees, a flat transition area is provided for forming of the parting line, when a finger of a user touches the parting line, due to the fact that sharp edges do not exist, hand cutting injuries can be effectively reduced or eliminated, and the user experience is improved. In addition, the protruding angle of the parting line is reduced, it is further guaranteed that a user cannot be cut by the sharp part of the parting line in the using process, the appearance of the lampshade is smoother and more exquisite, no obvious abrupt feeling exists, and the satisfaction degree of the user to the product appearance is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and in particular to a lampshade mold structure. Background Technology

[0002] With the rapid development of automotive lighting technology, customers have increasingly higher requirements for the appearance quality of automotive lights. Injection molding of automotive lights, as a crucial step in the manufacturing process, directly determines the appearance quality and safety of the lights. However, in actual production, the demolding of the front and rear molds can create protruding parting lines on the surface of the lamp cover. These protruding parting lines can easily cause cuts to users' hands, affecting user experience and posing safety hazards. Utility Model Content

[0003] The main purpose of this utility model is to propose a lampshade mold structure, which aims to solve the problem of how to reduce the risk of users cutting their hands due to the parting line.

[0004] To achieve the above objectives, this utility model proposes a lampshade mold structure for injection molding lampshades, the lampshade mold structure comprising:

[0005] A front mold having a first cavity formed thereon, the front mold including a first flat portion located at the edge of the first cavity;

[0006] The rear mold has a second cavity formed on it. The rear mold includes a second flat portion located at the edge of the second cavity. The front mold is connected to the rear mold so that the first cavity and the second cavity communicate to form a mold cavity. A parting line is formed at the junction between the first flat portion and the second flat portion. An included angle is formed between the first flat portion and the second flat portion. The included angle is defined as C. Then: 170°≤C≤177°.

[0007] In one embodiment, the extension width of the first flat portion is defined as A, then A ≥ 0.5 mm.

[0008] In one embodiment, the extension width of the second flat portion is defined as B, then B ≥ 0.5 mm.

[0009] In one embodiment, the included angle is defined as C, then C ≥ 177°.

[0010] In one embodiment, the front mold further includes a first forming part and a first arc transition part, the two ends of the first arc transition part being connected to the first flat part and the first forming part respectively, and the first forming part, the first arc transition part and the first flat part forming the first cavity.

[0011] In one embodiment, the rear mold further includes a second forming part and a second arc transition part, the two ends of the second arc transition part being connected to the second flat part and the second forming part respectively, and the second forming part, the second arc transition part and the second flat part enclosing each other to form the second cavity.

[0012] In one embodiment, the parting line is located at the edge, back, or non-visually critical area of ​​the lampshade.

[0013] In one embodiment, the front mold and the rear mold are detachably connected.

[0014] In one embodiment, the front mold is provided with a first injection port, which communicates with the first cavity;

[0015] And / or,

[0016] The rear mold is provided with a second injection port, which is connected to the second cavity.

[0017] In one embodiment, the cavity wall of the first cavity is coated with a first release agent layer.

[0018] In one embodiment, the cavity wall of the second cavity is coated with a second release agent layer.

[0019] In this embodiment of the invention, the first cavity formed on the front mold and the second cavity formed on the rear mold are both for containing molten plastic. The shapes of the first and second cavities determine the final appearance of the lampshade. During mold assembly, the front and rear molds are accurately connected according to design requirements, so that the first and second cavities can be accurately connected to form a mold cavity. During injection molding, the injection molding machine injects the molten plastic into the mold cavity formed by the connection of the front and rear molds at a certain pressure and flow rate. Since the first flat portion is located at the edge of the first cavity, the second flat portion is located at the edge of the second cavity, and the first... An angle is formed between the first and second flat portions. The flow and filling of the molten plastic in the mold cavity are guided and restricted by the first and second flat portions, causing the parting line to be formed at the junction between the first and second flat portions. After cooling and solidification, a lampshade with a specific shape is formed. That is, the lampshade can be injection molded to correspond to the first flat portion to form the first flat area, and to correspond to the second flat portion to form the second flat area. The parting line is located between the first and second flat areas. Compared with the design of sharp edges at the parting line in traditional mold structures, in this embodiment of the invention... The design of the first and second flat portions, with an included angle of 170°≤C≤177°, ensures a smooth, near-straight transition at the junction of the first and second flat portions (i.e., the parting line). This provides a relatively flat transition area for the parting line, reducing its height and sharpness. Even if the parting line protrudes slightly, it will not form a sharp edge, reducing or eliminating the risk of cuts to the user upon contact. Furthermore, the large included angle between the first and second flat portions effectively controls the height of the parting line, keeping it within 0.2mm. The following improvements result in a smoother product surface, free of noticeable steps or protrusions, enhancing the overall appearance quality. This makes the connection between the lampshade and the vehicle body smoother and more seamless, improving user safety and comfort. It also ensures a tighter fit between the front and rear molds, increasing mold closure precision and reducing parting line protrusions caused by assembly deviations. Furthermore, it reduces stress concentration at the parting line, extending mold lifespan, and making the demolding process smoother, reducing product damage during demolding and improving production efficiency.This embodiment of the invention employs a first flat portion and a second flat portion, with the included angle between the first flat portion and the second flat portion being 170°≤C≤177°. This provides a smooth transition area for the parting line. When a user touches the parting line with their finger, the absence of sharp edges effectively reduces or eliminates hand injuries. Furthermore, the large included angle between the first flat portion 12 and the second flat portion 22 reduces the protrusion angle of the parting line, further ensuring that the user will not be cut by the sharp part of the parting line during use. This also makes the lampshade appearance smoother and more refined, without any obvious abruptness, thus improving user satisfaction with the product's appearance. Attached Figure Description

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

[0021] Figure 1 This is a schematic diagram of one embodiment of the lampshade mold structure of this utility model;

[0022] Figure 2 for Figure 1 A magnified view of a section at point D;

[0023] Figure 3 This is a structural schematic diagram of an embodiment of the lamp cover of this utility model being assembled with a vehicle body;

[0024] Figure 4 This is another schematic diagram of the structural arrangement of the lamp cover and the vehicle body according to an embodiment of the present utility model.

[0025] Figure 5 for Figure 4 A magnified view of a section at point E in the middle.

[0026] Explanation of icon numbers:

[0027] 100. Lampshade mold structure; 1. Front mold; 11. First cavity; 12. First flat part; 13. First forming part; 14. First arc transition part; 2. Rear mold; 21. Second cavity; 22. Second flat part; 23. Second forming part; 24. Second arc transition part; 3. Mold cavity; 4. Parting line;

[0028] 200. Lampshade; 210. First flat area; 220. Second flat area;

[0029] 300. Vehicle body.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, and back), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] With the rapid development of automotive lighting technology, customers have increasingly higher requirements for the appearance quality of automotive lights. Injection molding of automotive lights, as a crucial step in the manufacturing process, directly determines the appearance quality and safety of the lights. However, in actual production, the demolding of the front and rear molds can create protruding parting lines on the surface of the lamp cover. These protruding parting lines can easily cause cuts to users' hands, affecting user experience and posing safety hazards.

[0035] After careful study, the applicant found that, ideally, the parting line should be zero in height, with a smooth surface that would not cause cuts to the user's hands. However, in actual production, due to assembly deviations and unavoidable misalignments between the front and rear molds, the parting line of the product will protrude. The height of the protruding parting line is generally 0.2mm, and the parting line is usually located at the edge of the product. These areas are often the places where users are most likely to come into contact with the product. The parting line may form a sharp edge, increasing the risk of the user being cut when touching it.

[0036] The main purpose of this utility model is to propose a lampshade mold structure to solve the problem of how to reduce the risk of users cutting their hands due to the parting line.

[0037] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the lampshade mold structure 100 is used for injection molding of lampshade 200. The lampshade mold structure 100 includes a front mold 1 and a rear mold 2. A first cavity 11 is formed on the front mold 1. The front mold 1 includes a first flat portion 12, which is located at the edge of the first cavity 11. A second cavity 21 is formed on the rear mold 2. The rear mold 2 includes a second flat portion 22, which is located at the edge of the second cavity 21. The front mold 1 and the rear mold 2 are connected so that the first cavity 11 and the second cavity 21 communicate to form a mold cavity 3. A parting line 4 is formed at the junction between the first flat portion 12 and the second flat portion 22. An included angle is formed between the first flat portion 12 and the second flat portion 22. The included angle is defined as C, then: 170°≤C≤177°.

[0038] In this embodiment of the invention, the first cavity 11 formed on the front mold 1 and the second cavity 21 formed on the rear mold 2 are both for accommodating the molten plastic. The shapes of the first cavity 11 and the second cavity 21 determine the final appearance of the lampshade 200. During mold assembly, the front mold 1 and the rear mold 2 are accurately connected according to design requirements, so that the first cavity 11 and the second cavity 21 can be accurately connected to form the mold cavity 3. During injection molding, the injection molding machine injects the molten plastic into the mold cavity 3 formed by the connection of the front mold 1 and the rear mold 2 at a certain pressure and flow rate. Since the first flat portion 12 is located at the edge of the first cavity 11 and the second flat portion 22 is located at the edge of the second cavity 21, and an angle is formed between the first flat portion 12 and the second flat portion 22, the flow and filling of the molten plastic in the mold cavity 3 are guided and restricted by the first flat portion 12 and the second flat portion 22, so that the parting line 4 is formed at the junction between the first flat portion 12 and the second flat portion 22. Finally, after cooling and solidification, a lampshade 200 with a specific shape is formed. Please refer to [link to relevant documentation]. Figures 3 to 5That is, the lampshade 200 can be injection molded to form the first flat area 210 corresponding to the first flat part 12, and to form the second flat area 220 corresponding to the second flat part 22. The parting line 4 is located between the first flat area 210 and the second flat area 220. Compared with the design of forming a sharp edge at the parting line 4 in the traditional mold structure, in this embodiment of the utility model, by designing the first flat part 12 and the second flat part 22, and the included angle 170°≤C≤177°, it is ensured that the junction between the first flat part 12 and the second flat part 22 (i.e., the parting line 4) can form a smooth transition that is close to a straight line. This provides a relatively flat transition area for the parting line 4, reduces the height and sharpness of the parting line 4, so that even if the parting line 4 protrudes slightly, it will not form a sharp edge, reducing or eliminating the risk of being cut when the user touches it. The risk is reduced, and because the included angle between the first flat part 12 and the second flat part 22 is large, the height of the parting line 4 is effectively controlled, which can be controlled to less than 0.2mm. This makes the surface of the product smoother, without obvious steps or protrusions, improving the overall appearance quality. It also makes the connection between the lamp cover 200 and the vehicle body 300 smoother and more seamless, making the user's contact experience safer and more comfortable. This improves the overall user experience, ensures a tighter fit between the front mold 1 and the rear mold 2, improves the accuracy of mold closure, reduces the problem of protrusion of the parting line 4 caused by assembly deviation, reduces stress concentration at the parting line 4, extends the service life of the mold, makes the demolding process smoother, reduces the product damage rate during demolding, and improves production efficiency.

[0039] The technical solution of this utility model adopts a first flat portion 12 and a second flat portion 22, and the included angle formed between the first flat portion 12 and the second flat portion 22 is 170°≤C≤177°, which provides a flat transition area for the forming of the parting line 4. When the user's finger touches the parting line 4, since there is no sharp edge, it can effectively reduce or eliminate hand injury. In addition, since the included angle between the first flat portion 12 and the second flat portion 22 is large, the protrusion angle of the parting line 4 is reduced, which further ensures that the user will not be cut by the sharp part of the parting line 4 during use. It also makes the lampshade 200 look smoother and more delicate, without obvious abruptness, and improves the user's satisfaction with the product appearance.

[0040] In this embodiment, the included angle C between the first flat portion 12 and the second flat portion 22 is 177°, which can reduce or eliminate hand injuries caused by the protrusion of the parting line 4, and also facilitate demolding and improve production efficiency.

[0041] In this embodiment, the design of the lamp cover mold structure 100 exhibits high versatility and flexibility, and can meet the manufacturing needs of different types of vehicle lamp covers 200. Specifically, the shapes of the first cavity 11 on the front mold 1 and the second cavity 21 on the rear mold 2 are not limited, so that the lamp cover mold structure 100 can be flexibly adjusted to adapt to various application scenarios. For example, when producing lamp covers 200 for various types of vehicle lamps such as front combination lamps, rear combination lamps, or high-mounted brake lights, it is only necessary to adjust the shapes of the first cavity 11 and the second cavity 21 according to the specific product design requirements, which greatly improves the flexibility and versatility of the lamp cover mold structure 100.

[0042] Please see Figure 2 In one embodiment, the extension width of the first flat portion 12 is defined as A, then A ≥ 0.5 mm. Specifically, the first flat portion 12 is located at the edge of the first cavity 11 of the front mold 1, and its main function is to cooperate with the second flat portion 22 to provide a relatively flat transition area, so that even if the parting line 4 protrudes slightly, it will not form a sharp edge. By setting the extension width A of the first flat portion 12 to ≥ 0.5 mm, it is ensured that the parting line 4 has sufficient contact area at the front mold 1 to smoothly transition, so that the plastic melt can be evenly distributed and filled in the mold cavity 3, thereby reducing the height and sharpness of the parting line 4. The smoothness of the surface of the lampshade 200, without obvious steps or protrusions, reduces or eliminates the risk of cuts to users upon contact, and improves the overall appearance quality. Furthermore, the design with A ≥ 0.5mm ensures a sufficiently large contact area between the front mold 1 and the rear mold 2, improving the accuracy of mold closure, reducing the protrusion of the parting line 4 due to assembly deviations, further enhancing the consistency and stability of product quality, and reducing local stress concentration, thereby extending the service life of the front mold 1, making the demolding process smoother, reducing product damage during demolding, and improving production efficiency. In this embodiment, the extension width A of the first flat portion 12 can be selected as 0.5mm, thereby reducing the risk of cuts from the parting line 4.

[0043] Please see Figure 2In one embodiment, the extension width of the second flat portion 22 is defined as B, then B ≥ 0.5 mm. Specifically, the second flat portion 22 is located at the edge of the second cavity 21 of the rear mold 2. Its main function is to cooperate with the first flat portion 12 to provide a relatively flat transition area, so that even if the parting line 4 protrudes slightly, it will not form a sharp edge. By setting the extension width B of the second flat portion 22 to ≥ 0.5 mm, it is ensured that the parting line 4 has sufficient contact area at the rear mold 2 for a smooth transition, so that the plastic melt can be evenly distributed and filled in the mold cavity 3, thereby reducing the height and sharpness of the parting line 4. The smoothness of the surface of the lampshade 200, without obvious steps or protrusions, reduces or eliminates the risk of cuts to users upon contact, and improves the overall appearance quality. Furthermore, the design with B ≥ 0.5mm ensures a sufficiently large contact area between the front mold 1 and the rear mold 2, improving the accuracy of mold closure, reducing the protrusion of the parting line 4 due to assembly deviations, further enhancing the consistency and stability of product quality, reducing local stress concentration, thereby extending the service life of the rear mold 2, making the demolding process smoother, reducing product damage during demolding, and improving production efficiency. In this embodiment, the extension width B of the second flat portion 22 can be selected as 0.5mm, thereby reducing the risk of cuts from the parting line 4.

[0044] Please see Figure 1 and Figure 2 In one embodiment, the front mold 1 further includes a first molding part 13 and a first arc transition part 14. The two ends of the first arc transition part 14 are connected to the first flat part 12 and the first molding part 13, respectively. The first molding part 13, the first arc transition part 14 and the first flat part 12 enclose to form a first cavity 11. Specifically, the first molding part 13 determines the specific shape and detailed features of the lampshade 200, such as curvature and thickness, which directly affects the appearance and functional characteristics of the lampshade 200. The main function of the first arc transition part 14 is to provide an arc transition between the first molding part 13 and the first flat part 12, reduce stress concentration and sharp edges at the connection between the first flat part 12 and the first molding part 13, make the overall surface of the product smoother, without obvious steps or protrusions, and avoid the protrusion at the connection between the first flat part 12 and the first molding part 13 from being sharp and cutting, thereby improving the overall appearance quality and user experience of the product.

[0045] Please see Figure 1 and Figure 2In one embodiment, the rear mold 2 further includes a second molding portion 23 and a second arc transition portion 24. The two ends of the second arc transition portion 24 are respectively connected to the second flat portion 22 and the second molding portion 23. The second molding portion 23, the second arc transition portion 24 and the second flat portion 22 enclose and form a second cavity 21. Specifically, the second molding portion 23 determines the specific shape and detailed features of the lampshade 200, such as curvature and thickness, which directly affects the appearance and functional characteristics of the lampshade 200. The main function of the second arc transition portion 24 is to provide an arc transition between the second molding portion 23 and the second flat portion 22, reduce stress concentration and sharp edges at the connection between the second flat portion 22 and the second molding portion 23, make the overall surface of the product smoother, without obvious steps or protrusions, and avoid the protrusion at the connection between the second flat portion 22 and the second molding portion 23 from being sharp and cutting the hand, thereby improving the overall appearance quality and user experience of the product.

[0046] In one embodiment, the parting line 4 is located at the edge, back, or non-visually critical area of ​​the lampshade 200. Specifically, placing the parting line 4 at the edge of the lampshade 200 reduces the chance of users directly contacting it, lowering the risk of cuts. Placing it on the back of the lampshade 200 minimizes the impact on the user's normal experience and better conceals it, enhancing the product's aesthetics. Non-visually critical areas refer to areas that users are unlikely to notice during normal use, such as the bottom or sides of the lampshade 200. These areas typically do not directly affect the overall appearance of the lampshade 200; therefore, placing the parting line 4 here effectively conceals it, reducing its impact on the product's aesthetics. Optimizing the position of the parting line 4 makes the demolding process smoother, reducing product damage during demolding and improving production efficiency. In this embodiment, the parting line 4 can be placed at the edge, back, or non-visually critical area of ​​the lampshade 200 according to actual needs; the specific location of the parting line 4 is not limited in this embodiment.

[0047] In one embodiment, the front mold 1 and the rear mold 2 are detachably connected. Specifically, the detachable connection allows the front mold 1 and the rear mold 2 to be maintained, cleaned, or replaced separately, enabling more frequent inspection and repair of the molds. This maintains the high-quality mold condition of both the front mold 1 and the rear mold 2, helping to ensure that the height and smoothness of the parting line 4 are always optimal, thereby reducing the risk of cuts to users upon contact. Furthermore, during production, the detachable connection allows for precise adjustment and maintenance of the front mold 1 and the rear mold 2, resulting in a tighter fit between them. This improves the accuracy of mold closure and reduces the protrusion of the parting line 4 due to assembly deviations. This ensures that the height of the parting line 4 of each lampshade 200 is strictly controlled within a safe range, for example, not exceeding 0.2mm, thus ensuring the consistency and stability of product quality. In this embodiment, the front mold 1 and the rear mold 2 can be detachably connected by screws or snap-fit ​​connections; this embodiment is not limited to this method.

[0048] In one embodiment, a first injection port (not shown) is provided on the front mold 1, and the first injection port is connected to the first cavity 11; and / or, a second injection port (not shown) is provided on the rear mold 2, and the second injection port is connected to the second cavity 21; specifically, the injection port is the channel for the plastic melt to enter the mold cavity 3, ensuring that the plastic melt can fill the entire cavity evenly and efficiently. By reasonably setting the position of the injection port, the flow path of the plastic melt in the mold cavity 3 can be optimized, reducing defects such as bubbles and flow marks, and improving the quality consistency and stability of each lampshade 200; in this embodiment, according to different product designs and process requirements, the first injection port can be provided on the front mold 1 or the second injection port can be provided on the rear mold 2, or even the first injection port can be provided on the front mold 1 and the second injection port can be provided on the rear mold 2 at the same time to meet different production needs. This embodiment does not limit this.

[0049] In one embodiment, a first release agent layer (not shown) is coated on the cavity wall of the first cavity 11. Specifically, the release agent layer is a coating material used to reduce the adhesion between the plastic melt and the mold surface. It can effectively prevent the plastic product from sticking to the inner wall of the mold cavity 3 after cooling, making it easy to demold. By coating the cavity wall of the first cavity 11 with the first release agent layer, the friction between the plastic melt and the mold can be reduced, thereby reducing the wear of the front mold 1 and extending the service life of the front mold 1. It also helps to reduce scratches, bubbles and other defects at the first flat area 210 and parting line 4 on the surface of the lampshade 200 product, improving the surface quality and consistency of the product.

[0050] In one embodiment, a second release agent layer (not shown) is coated on the cavity wall of the second cavity 21. Specifically, by coating the cavity wall of the second cavity 21 with the second release agent layer, the friction between the plastic melt and the mold can be reduced, thereby reducing the wear of the rear mold 2, extending the service life of the rear mold 2, and also helping to reduce scratches, bubbles and other defects at the second flat area 220 and parting line 4 on the surface of the lampshade 200, thus improving the surface quality and consistency of the product.

[0051] In this embodiment, depending on different product design and process requirements, a first release agent layer can be coated on the cavity wall of the first cavity 11 or a second release agent layer can be coated on the cavity wall of the second cavity 21. It is even possible to simultaneously coat the first release agent layer on the cavity wall of the first cavity 11 and the second release agent layer on the cavity wall of the second cavity 21 to meet different production needs. This embodiment does not limit this.

[0052] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A lampshade mold structure for injection molding lampshades, characterized in that, The lampshade mold structure includes: A front mold having a first cavity formed thereon, the front mold including a first flat portion located at the edge of the first cavity; The rear mold has a second cavity formed on it. The rear mold includes a second flat portion located at the edge of the second cavity. The front mold is connected to the rear mold so that the first cavity and the second cavity communicate to form a mold cavity. A parting line is formed at the junction between the first flat portion and the second flat portion. An included angle is formed between the first flat portion and the second flat portion. The included angle is defined as C. Then: 170°≤C≤177°.

2. The lampshade mold structure as described in claim 1, characterized in that, If we define the extension width of the first flat portion as A, then A ≥ 0.5 mm.

3. The lampshade mold structure as described in claim 2, characterized in that, If we define the extension width of the second flat portion as B, then B ≥ 0.5 mm.

4. The lampshade mold structure as described in claim 1, characterized in that, The front mold further includes a first forming part and a first arc transition part. The two ends of the first arc transition part are respectively connected to the first flat part and the first forming part. The first forming part, the first arc transition part and the first flat part together form the first cavity.

5. The lampshade mold structure as described in claim 1, characterized in that, The rear mold further includes a second forming part and a second arc transition part. The two ends of the second arc transition part are respectively connected to the second flat part and the second forming part. The second forming part, the second arc transition part and the second flat part together form the second cavity.

6. The lampshade mold structure as described in any one of claims 1 to 5, characterized in that, The parting line is located at the edge, back, or non-visually critical area of ​​the lampshade.

7. The lampshade mold structure as described in any one of claims 1 to 5, characterized in that, The front mold and the rear mold are detachably connected.

8. The lampshade mold structure as described in any one of claims 1 to 5, characterized in that, The front mold is provided with a first injection port, which is connected to the first cavity; And / or, The rear mold is provided with a second injection port, which is connected to the second cavity.

9. The lampshade mold structure as described in any one of claims 1 to 5, characterized in that, The cavity wall of the first cavity is coated with a first release agent layer.

10. The lampshade mold structure as described in any one of claims 1 to 5, characterized in that, The cavity wall of the second cavity is coated with a second release agent layer.

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