Splicing structure for multi-color lens of vehicle lamp and preparation method thereof

Abstract

The present invention provides a splicing structure for a multi-color lens of a vehicle lamp and a preparation method thereof, comprising: an inner plastic structure and an outer plastic structure; the inner plastic structure comprises an inner plastic body and an inner plastic mouth that are integrally formed; the outer plastic structure comprises an outer plastic body and an outer plastic mouth that are integrally formed; the inner plastic structure and the outer plastic structure are spliced, the inner plastic body and the outer plastic structure are spliced, and the inner plastic mouth and the outer plastic mouth are spliced ​​correspondingly; the inner plastic structure and the outer plastic structure are spliced ​​to form a splicing line; and a step structure is integrally formed on the outer plastic mouth. The splicing structure of the present invention solves the problem of stratification of the two-color joint caused by water accumulation in a tiny V-groove at the two-color joint by changing the shape, size, and angle of the splicing part near the end of the two-color joint, eliminates the appearance defects caused by two-color stratification, and improves the service life of the vehicle lamp.

Description

Technical Field

[0001] The invention relates to the technical field of automobile lamps, and in particular to a splicing structure of multi-color lenses for automobile lamps and a preparation method thereof. Background Art

[0002] Two-color injection molding exterior mirrors are widely used in the automotive lighting industry. OEMs have extremely high requirements for the appearance of exterior mirrors of automotive lights, and the exterior mirrors of automotive lights are key components that play a sealing role in protecting internal parts. Fig.11 As shown, the two-color splicing method of the prior art has the following defects: a small V-groove structure is formed on the outer surface of the splicing because the end near the sharp corner cannot be fully filled during injection molding. The V-groove structure cannot be eliminated even after plasma flame treatment in the later stage. Due to the existence of the V-groove, water is easily accumulated, such as water will accumulate in the V-groove on rainy days and when washing the car. At the same time, due to the existence of internal stress in the two-color injection molding, under the combined effect of the two, over time, the two-color injection molding structure will be delaminated at the joints, resulting in appearance defects and even airtightness problems, and ultimately causing the failure of the car lights.

[0003] Although plasma flame treatment after molding can eliminate some internal stress, it is impossible to completely eliminate internal stress, and the residual internal stress and the accumulation of water or liquid during car washing make the above problems unavoidable. On the other hand, plasma only eliminates partial stress in a part of the outer lens area, and cannot cover all the two-color splicing positions of the outer lens. For example, the inner surface of the outer lens and the outer surface of the outer lens appearance cannot be treated with plasma flame, otherwise the appearance area will be blurred. The stress removal of the appearance area is to use an oven, but this has little effect on the above problems.

[0004] The delamination of the two-color injection molded outer lens at the seam will make it possible to clearly see a bright line in the middle of the two colors when observing the outer lens, resulting in appearance defects. In addition, the requirements of OEM customers and car buyers for appearance are increasing day by day. At the same time, the delamination of the two-color outer lens at the seam may also cause potential lens cracking problems over time. In addition, even for two-color injection molded outer lenses, not all structural parts of the outer lens are two-layer or two-color materials. For those outer lenses that only have local areas that are double-layered, if the layer of the local area mentioned above in the double layer is the inner layer of plastic, then due to the above-mentioned V-grooves, water accumulation, stress cracking and other problems, after the overlapping area of ​​the double layer cracks, water vapor will enter the other color layer (outer layer of plastic) of the two-color lens along the gap between the two layers. At this time, the water vapor enters the interior of the lamp body, resulting in poor air tightness of the lamp, which in turn causes other serious and unavoidable problems, such as Fig.12As shown, part C can be understood as only a local area of ​​the outer lens area, part D can be understood as the entire or most area of ​​the outer lens area, area M is inside the lamp, and area N is outside the lamp. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a splicing structure for a multi-color lens of a vehicle lamp and a preparation method thereof.

[0006] According to the present invention, a splicing structure for a multi-color lens of a vehicle lamp includes: an inner plastic structure and an outer plastic structure; the inner plastic structure includes an inner plastic body and an inner plastic mouth that are integrally formed; the outer plastic structure includes an outer plastic body and an outer plastic mouth that are integrally formed;

[0007] The inner plastic structure is spliced ​​with the outer plastic structure, the inner plastic body is spliced ​​with the outer plastic structure, the inner plastic mouth is spliced ​​with the outer plastic mouth; the inner plastic structure is spliced ​​with the outer plastic structure to form a splicing line;

[0008] The outer plastic mouth is integrally formed with a step structure.

[0009] Preferably, the size C of the outer plastic mouth is ≥1.5 mm.

[0010] Preferably, the height dimension D of the step structure is 0.15-0.4 mm.

[0011] Preferably, the height dimension D of the step structure is 0.2 mm.

[0012] Preferably, the splicing line is a linear structure.

[0013] Preferably, the splicing line is a linear structure that is bent or folded multiple times.

[0014] Preferably, the mold release angle α of the outer plastic mouth is ≥10°

[0015] Preferably, the angle β formed by the step structure and the demoulding direction is 90°±20°.

[0016] Preferably, the angle γ between the inner plastic structure and the mold opening direction is ≥10°.

[0017] The present invention also provides a method for preparing a splicing structure for a vehicle lamp, based on the above-mentioned splicing structure for a vehicle lamp, which specifically includes the following steps:

[0018] Step 1: Injection molding a two-color plastic part of the inner plastic structure and the outer plastic structure in a mold;

[0019] Step 2: performing plasma flame spraying from the side of the step structure of the outer plastic structure, with the side direction of the step structure away from the inner plastic structure as the first plasma flame spraying direction;

[0020] Step 3: From the upper position of the step structure, the upper side of the position where the step structure melts and falls after the first plasma flame spraying is used as the second plasma flame spraying direction.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The two-color splicing structure of the present invention solves the problem of delamination of the two-color joint caused by water accumulation in the tiny V-groove at the two-color splicing, eliminates the appearance defects caused by the two-color delamination, and increases the service life of the lamp;

[0023] 2. The two-color splicing structure of the present invention increases the splicing area between the inner plastic structure and the outer plastic structure, making the splicing force between the inner plastic structure and the outer plastic structure stronger, making the splicing between the inner plastic structure and the outer plastic structure more firm and reliable, ensuring the reliability of the outer lens molding and avoiding the appearance defects such as bright lines and cracks;

[0024] 3. The setting of the demolding angle of the outer plastic mouth of the present invention ensures that the outer plastic structure will not be affected by the drag of the mold friction force, resulting in the enlargement of the joints and delamination; the setting of the angle between the step structure and the demolding direction ensures the effectiveness of the mold claw holding force; the setting of the angle between the inner plastic structure and the mold opening direction ensures that the inner plastic structure will not be affected by the drag of the mold friction force, resulting in the enlargement of the joints and delamination; the setting of the size of the outer plastic mouth ensures the strength of the junction between the outer plastic and the inner plastic. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 A schematic diagram of a splicing structure of a multi-color lens for a vehicle lamp in an embodiment Figure 1 ;

[0027] Figure 2 for Figure 1 A schematic diagram of the dimensions of a splicing structure for a multi-color lens for a headlight;

[0028] Figure 3 A schematic diagram of a splicing structure for a multi-color lens for a vehicle lamp in an embodiment Figure 2 ;

[0029] Figure 4 for Figure 3 A magnified view of the H section of the splicing structure of the multi-color lens for the headlight before plasma flame treatment;

[0030] Figure 5 for Figure 3 A magnified view of the H section of the splicing structure of the multi-color lens for the headlight after plasma flame treatment;

[0031] Figure 6 for Figure 3 Schematic diagram of the dimensions of the splicing structure of the multi-color lens for the headlight after plasma flame treatment;

[0032] Figure 7 for Figure 3 Schematic diagram of the operation process of plasma flame treatment of the spliced ​​structure of multi-color lenses for headlights;

[0033] Figure 8 A schematic structural diagram of a splicing structure for a multi-color lens of a vehicle lamp in an embodiment in which the splicing line is a linear structure;

[0034] Fig. 9 for Figure 8 Schematic diagram of the structure of the splicing structure of the multi-color lens for the headlight after ion flame treatment;

[0035] Fig.10 To select step structures with different height dimensions D, the effect comparison chart after processing;

[0036] Fig.11 It is a schematic diagram of a splicing structure in the prior art before and after ion flame treatment;

[0037] Fig.12 It is a structural schematic diagram of a partially spliced ​​structure in the prior art.

[0038] The figure shows:

[0039] Inner plastic structure 1 Outer plastic body 201

[0040] Inner plastic body 101 Outer plastic mouth 202

[0041] Inner plastic mouth 102 Splicing line 3

[0042] Outer plastic structure 2 Step structure 4 DETAILED DESCRIPTION

[0043] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0044] Embodiment 1:

[0045] like Figures 1 to 7 As shown, this embodiment provides a splicing structure for a multi-color lens of a headlight, comprising: an inner plastic structure 1 and an outer plastic structure 2, wherein the inner plastic structure 1 comprises an inner plastic body 101 and an inner plastic mouth 102 which are integrally formed, and the outer plastic structure 2 comprises an outer plastic body 201 and an outer plastic mouth 202 which are integrally formed. The inner plastic structure 1 and the outer plastic structure 2 are spliced, the inner plastic body 101 and the outer plastic structure 2 are spliced, the inner plastic mouth 102 and the outer plastic mouth 202 are spliced ​​correspondingly, the inner plastic structure 1 and the outer plastic structure 2 are spliced ​​to form a splicing line 3, and a step structure 4 is integrally formed on the outer plastic mouth 202.

[0046] The splicing line 3 is a linear structure that is bent or folded multiple times. The linear structure that is bent or folded multiple times can increase the splicing area between the inner plastic structure 1 and the outer plastic structure 2, so that the splicing bonding force between the inner plastic structure and the outer plastic structure is stronger, and the splicing between the inner plastic structure and the outer plastic structure is more firm and reliable, which not only ensures the reliability of the outer lens molding, but also avoids the appearance defects such as bright lines and cracks.

[0047] The demolding angle α of the outer plastic mouth 202 is ≥10°. If this angle is set too small, the outer plastic structure is easily dragged by the friction of the mold during the demolding stage during injection molding, resulting in increased seams and delamination.

[0048] The angle β between the step structure 4 and the demoulding direction is 90°±20°, thereby ensuring that the mold claws can effectively retain the outer plastic structure on the front mold when the outer plastic structure is opened. If this angle is too large or too small, the effectiveness of the mold claw holding force will be affected.

[0049] The angle γ between the inner plastic structure 1 and the mold opening direction is ≥10°. If this angle is set too small, the inner plastic structure is easily dragged by the friction of the mold during the demolding stage during injection molding, resulting in increased seams and delamination.

[0050] The size C of the outer plastic mouth 202 is ≥ 1.5 mm. If this size is too small, it will affect the strength of the joint between the outer plastic structure and the inner plastic structure. Parameter C determines the thickness of the envelope and the splicing part of the outer plastic structure 2, and also determines the splicing strength. If C is too short, it will lead to the problem of thin thickness of the splicing part of the step structure 4 and insufficient strength after splicing. C ≥ 1.5 mm can ensure reliable splicing strength.

[0051] The height dimension D of the step structure 4 is 0.15-0.4 mm. In the preferred example, the height dimension D of the step structure 4 is 0.2 mm. If this dimension is set too large, the subsequent plasma flame cannot completely melt it and fill it into the V-groove formed at the junction of the inner and outer plastic structures. There may also be residues after the plasma flame melts. These residues are not filled into the V-groove, and their size is not small, which will seriously affect the appearance, and the V-groove formed at the junction of the inner and outer plastic layers cannot be completely filled. The V-groove still cannot be filled and covered. On the one hand, D determines that the splicing structure can form a good inclusion and reliable splicing. On the other hand, it determines to avoid the V-groove problem. If D is too small, the step structure will be similar to a flash, which will lead to insufficient splicing force of the splicing structure and inability to reliably envelop. It may also cause other appearance defects. If D is too large, the outer plastic structure will not be able to be completely and reliably envelop. In addition to the problem of splicing force, more importantly, the V-groove problem area is not enveloping, such as Fig.10 As shown, after the plasma flame treatment, the A-line area of ​​the step structure 4 which originally appeared theoretically will become the B-line area.

[0052] The inner plastic structure 1 and the outer plastic structure 2 are both made of PC or PMMA. In practical applications, ABS materials should be avoided, as they will have serious appearance problems after plasma flame treatment, or at least ABS materials should be avoided for step structures and structures involving the appearance surface area.

[0053] This embodiment also provides an outer lens, including the above-mentioned two-color splicing structure.

[0054] like Figure 8 and Fig. 9 As shown, in other embodiments, the splicing line 3 may also be a linear structure.

[0055] This embodiment also provides a method for preparing a splicing structure for a multi-color lens of a vehicle lamp, based on the above-mentioned splicing structure for a multi-color lens of a vehicle lamp, which specifically includes the following steps:

[0056] Step 1: Injection molding a two-color plastic part of an inner plastic structure 1 and an outer plastic structure 2 in a mold;

[0057] Step 2: Plasma flame spraying is performed from the side of the step structure 4 of the outer plastic structure 2, with the side direction of the step structure 4 away from the inner plastic structure 1 being the first plasma flame spraying direction;

[0058] Step 3: From the upper position of the step structure 4, the upper side of the position where the step structure 4 melts and falls after the first plasma flame spraying is used as the second plasma flame spraying direction.

[0059] During the first spraying, the plasma flame only sprays the outer plastic structure 2, and sprays along the side of the step structure 4 of the outer plastic structure 2, and does not spray to the inner plastic structure 1, so that the first sprayed plasma flame does not contact the inner plastic structure 1. If the first plasma flame spray is sprayed to the inner plastic structure 1, the effect of the plasma flame will cause the inner plastic structure 1, especially the position where the inner plastic structure 1 and the outer plastic structure 2 originally have a V-shaped groove, and the V-shaped groove problem will be more serious due to the plasma flame spraying in the first plasma flame spraying, and the delamination and bright line problems will be caused in the first plasma flame spraying. No matter how the outer plastic structure wraps the inner plastic structure, the delamination and bright line problems caused by the first plasma spraying cannot be solved.

[0060] During the second spraying, the direction of the plasma flame is from top to bottom. At this time, the plasma flame is mainly aimed at the step structure 4 of the gradually drooping outer plastic structure 2 that has been partially softened or melted after the first spraying, and then it is sprayed again to melt or make it contact with part of the inner plastic structure 1 and combine together. In this process, the second spraying of the plasma flame will also indirectly act on the inner plastic structure 1 of the bonding surface, heating it and helping it to combine with the step structure 4 of the outer plastic structure 2, and part of it will directly act on the inner plastic structure 1, which is mainly at the edge and outer side of the inner plastic structure 1 that is enveloped by the step structure 4 of the outer plastic structure 2 after two plasma flame sprayings, helping the two to combine and improve the bonding force.

[0061] Embodiment 2:

[0062] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0063] like Figure 1As shown, this embodiment provides a two-color splicing structure, where the geometry and size of the splicing line are changed near the mold parting line, and the outer plastic structure is made 0.2 mm higher than the inner plastic structure to form a step structure, and while the injection stress is removed by a subsequent process of plasma flame, the raised portion of the outer layer is melted and wrapped on the inner layer to fill the fine V-groove feature between the two seams, thereby eliminating the V-groove at the splicing, and preventing water from accumulating in the V-groove at the splicing to cause the two-color exterior lens to separate from the joint.

[0064] Figure 1 It is a two-dimensional cross-sectional view of the two-color splicing structure of this embodiment, which includes an inner plastic structure 1, an outer plastic structure 2, an inner plastic mouth 102, an outer plastic mouth 202, a two-color splicing line, and a step structure 4.

[0065] In a preferred embodiment, the two-color splicing line structure is a hook-shaped or S-shaped line structure that is bent or folded multiple times.

[0066] like Figure 8 and Fig. 9 As shown, in other embodiments, the two-color splicing line is also a straight line structure, that is, the splicing line between the two-color outer plastic structure and the inner plastic structure is a straight line. After the plasma flame melts the raised step structure 4 and fills the V-shaped groove, the splicing line and the splicing area are in the form of about 90°.

[0067] like Figures 1 to 7 As shown, the two-color splicing line is a hook-shaped or S-shaped line structure that is bent or folded multiple times. After the plasma flame melts the step structure 4 and fills the V-shaped groove, an S-shaped splicing line is formed at the mouth as a whole, or it is first folded in one direction (there may or may not be a bend in the middle) and finally bent in the opposite direction of about 180° to the above-mentioned folded direction to form a form approximately 180°. The outer layer has a large rubber coating range, a large splicing area, and a strong bonding force.

[0068] like Figures 1 to 7As shown, after the plasma flame melts and fills the V-shaped groove, the hook-like multiple bending or folding structural design of the two-color splicing line makes the outer plastic structure 2 approximately wrap around the inner plastic structure 1. At the same time, the hook-like design has an effect of wrapping and grasping force, increases the splicing force, increases and ensures the force of the outer plastic structure 2 wrapping around the inner plastic structure 1, and increases the splicing area. After the straight splicing line is melted by the plasma flame, and after the hook-shaped splicing line is melted by the plasma flame, the hook-shaped splicing line structure has a larger splicing area or a larger wrapping range and area of ​​the outer plastic structure to the inner plastic structure due to multiple inward or outward bending and folding. The increase in the splicing area makes the splicing force bonding force between the two-color materials of the outer lens, that is, between the outer plastic structure 2 and the inner plastic structure 1, greater.

[0069] The outer plastic structure 2 wraps the inner plastic structure 1, increasing the splicing force between the outer plastic structure 2 and the inner plastic structure 1, and increasing the splicing area between the outer plastic structure 2 and the inner plastic structure 1, so that the splicing between the two-color outer plastic structure and the inner plastic structure of the outer lens is more firm and reliable, ensuring the reliability of the outer lens molding and avoiding the appearance defects such as bright lines and cracks.

[0070] When the two-color stitching line structure is designed as a hook-shaped or S-shaped line structure with multiple bends or folds, rounded corners, arcs or curved transition areas can be set in the multiple bend areas and some screaming structures, so that the injection molding fluidity is better and the quality and appearance of the molded outer lens are optimized.

[0071] In the two-color splicing structure, set the critical size of the splicing structure, such as Figure 2 As shown:

[0072] Set the demolding angle α of the outer plastic mouth to be ≥10°. If this angle is set too small, the outer plastic structure 2 is easily affected by the friction of the mold during the demolding stage during injection molding, resulting in increased seams and delamination; when punching the outer plastic, in order to ensure that the mold claws can effectively retain the outer plastic on the front mold when opening the mold, the angle β between the step structure 4 and the demolding direction needs to be set within the range of 90°±20°. This angle is too large or too small, which will affect the effectiveness of the mold claw's holding force; the angle γ between the inner plastic structure 1 and the mold opening direction is ≥10°. If this angle is set too small, the inner plastic structure 1 is easily affected by the friction of the mold during the demolding stage during injection molding, resulting in increased seams and delamination; the size C of the outer plastic mouth needs to be ≥1.5mm. If this size is too small, it will affect the outer plastic structure The strength of the joint between the inner and outer plastic structures 2 and 1; E is the size of the outer plastic structure left for the claw connection feature during injection molding. To ensure that the mold claws can effectively hold the outer plastic structure on the front mold when the mold is opened for the first time, this size needs to be ≥1mm; the height dimension D of the step structure 4 is set equal to 0.2mm. If this dimension is set too large, the subsequent plasma flame cannot completely melt it and fill it into the V-groove formed at the junction of the inner and outer plastic structures, and there may also be residues after the plasma flame melts. These residues are not filled into the V-groove, and their size is not small, which will seriously affect the appearance. If the size is set too small, the V-groove formed at the junction of the inner and outer plastic structures cannot be completely filled, and the V-groove still cannot be filled and covered. Under the condition of ensuring the above-mentioned size parameter settings, the products produced by the mold have the following problems: Figure 1 The step structure 4 shown is subsequently melted and covered on the mouth of the inner plastic layer while removing the injection stress through the plasma flame, thereby eliminating the V-shaped groove formed by the inner plastic structure and the outer plastic structure.

[0073] The setting of the demolding angle α of the outer plastic mouth ensures that the outer plastic structure 2 will not be affected by the drag of the mold friction force, resulting in the increase of the joint seam and delamination; the setting of the angle β between the step structure 4 and the demolding direction ensures the effectiveness of the mold claw holding force; the setting of the angle γ between the inner plastic structure 1 and the mold opening direction ensures that the inner plastic structure 1 will not be affected by the drag of the mold friction force, resulting in the increase of the joint seam and delamination; the setting of the size C of the outer plastic mouth ensures the strength of the junction between the outer plastic structure and the inner plastic structure; the setting of the size E of the outer plastic structure reserved for the clamping feature of the clamping claw during injection molding ensures that the mold clamping claw can effectively hold the outer plastic structure on the front mold when the mold is opened for the first time; the setting of the height size D of the step structure 4 ensures that the plasma flame can both completely melt it and fill the molten structural material to, and completely fill the V-groove feature formed at the junction of the inner and outer plastic layers.

[0074] like Figure 7As shown, when spraying the plasma flame, in order to further ensure the reliability and appearance of the outer lens, solve the delamination problem of the two-color material of the two-color lens and the bright line appearance defect caused by it, the plasma flame will be sprayed twice: the first time is to spray the plasma flame from the side of the step structure 4, and the side direction of the step structure 4 away from the inner plastic structure 1 is used as the first plasma flame spray direction; the second time is from the upper position of the step structure 4, and the upper side of the position where the step structure 4 has gradually melted and fallen after the first plasma flame spray is used as the second plasma flame spray direction. After two plasma flame sprays, the following is formed Figure 5 The structure shown removes stress, covers the V-groove, and solves the two-color material structure delamination problem and the bright line problem of the two-color outer lens.

[0075] Regarding the material selection of the outer lens, PC, PMMA, and ABS are conventionally used as two-color injection molding materials for the outer lens, but ABS materials should be avoided. After plasma flame treatment, ABS materials will have serious appearance problems, or at least step structures and structures involving the appearance surface area should avoid using ABS materials.

[0076] Two-color outer lenses are commonly used in the automotive lighting industry. They can be black and transparent, red and black, red and transparent, etc. The two-color joints, especially the step structure 4, are covered with V-grooves after plasma flame treatment. If the color of the outer plastic structure 2 is chosen to be darker than the color of the inner plastic structure 1, the potential appearance problems of the splicing lines at the two-color joints and the layered bright lines at the splicing can also be blocked, improved and solved. Therefore, the red and transparent two-color can set the red outside the transparent color, the outer plastic structure 2 is red, and the inner plastic structure 1 is transparent. The black and transparent two-color can set the black outside the transparent color, the outer plastic structure 2 is black, and the inner plastic structure 1 is transparent. The red and black two-color can set the black outside the red, the outer plastic structure 2 is black, and the inner plastic structure 1 is transparent.

[0077] When the outer lens is spliced ​​with three colors, four colors or more colors, there will be appearance problems of splicing line delamination and bright lines caused by this V-shaped groove and water accumulation at the multi-color splicing. However, the solutions of this embodiment are applicable. It is only necessary to set a step structure and a splicing line structure at the splicing to solve the appearance and splicing delamination problems.

[0078] In other embodiments, a separate black film area can be provided on the outer layer of the joint of the two-color lens. By providing the separate black film area on the outer layer of the joint, the black shielding function can be effectively used to shield the bright lines and other appearance problems caused by the delamination of the splicing line.

[0079] The two-color splicing structure of the present invention solves the problem of delamination of the two-color joint caused by water accumulation in a tiny V-groove at the two-color joint by changing the shape, size and angle of the splicing part near the end of the two-color joint, eliminates the appearance defects caused by two-color delamination, and increases the service life of the car lamp.

[0080] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0081] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for preparing a splicing structure for a multi-color lens of a vehicle lamp, the splicing structure comprising: An inner plastic structure (1) and an outer plastic structure (2); the inner plastic structure (1) comprises an inner plastic body (101) and an inner plastic mouth (102) which are integrally formed; the outer plastic structure (2) comprises an outer plastic body (201) and an outer plastic mouth (202) which are integrally formed; the inner plastic structure (1) and the outer plastic structure (2) are spliced ​​together, the inner plastic body (101) and the outer plastic body (201) are spliced ​​together, and the inner plastic mouth (102) and the outer plastic mouth (202) are spliced ​​together correspondingly; the inner plastic structure (1) and the outer plastic structure (2) are spliced ​​together to form a splicing line (3); a step structure (4) is integrally formed on the outer plastic mouth (202), and the preparation method specifically comprises the following steps: Step 1: Injection molding a two-color plastic part of the inner plastic structure (1) and the outer plastic structure (2) in a mold; Step 2: Plasma flame spraying is performed from the side of the step structure (4) of the outer plastic structure (2), with the side direction of the step structure (4) away from the inner plastic structure (1) being used as the first plasma flame spraying direction, and the first plasma flame spraying does not contact the inner plastic structure (1); Step 3: From the upper position of the step structure (4), the upper side of the position where the step structure (4) melts and falls after the first plasma flame spraying is used as the second plasma flame spraying direction.

2. The method for preparing a splicing structure of a multi-color lens for a vehicle lamp according to claim 1, characterized in that: The outer plastic mouth (202) has a size C ≥ 1.5 mm.

3. The method for preparing a splicing structure of a multi-color lens for a vehicle lamp according to claim 1, characterized in that: The height dimension D of the step structure (4) is 0.15-0.4 mm.

4. The method for preparing a splicing structure for a multi-color lens for a vehicle lamp according to claim 3, characterized in that: The height dimension D of the step structure (4) is 0.2 mm.

5. The method for preparing a splicing structure of a multi-color lens for a vehicle lamp according to claim 1, characterized in that: The splicing line (3) is a linear structure.

6. The method for preparing a splicing structure of a multi-color lens for a vehicle lamp according to claim 1, characterized in that: The splicing line (3) is a linear structure that is bent or folded multiple times.

7. The method for preparing a splicing structure for a multi-color lens for a vehicle lamp according to claim 1, characterized in that: The demoulding angle α of the outer plastic mouth (202) is ≥10°.

8. The method for preparing a splicing structure of a multi-color lens for a vehicle lamp according to claim 1, characterized in that: The angle β formed by the step structure (4) and the demoulding direction is 90°±20°.

9. The method for preparing a splicing structure for a multi-color lens for a vehicle lamp according to claim 1, characterized in that: The angle γ between the inner plastic structure (1) and the mold opening direction is ≥10°.

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