A shielding tool for color coating of an aluminum alloy wheel

Abstract

The application relates to the technical field of automobile wheel hubs, in particular to a shielding tool for aluminum alloy wheel color matching, which comprises a bottom positioning part, a middle segment shielding column and an arc shielding part; the bottom positioning part is matched with a wheel bolt small hole; the middle segment shielding column is arranged in a bolt large hole; the left and right sides of the arc shielding part are provided with plug-in grooves, so that multiple arc shielding parts can be circumferentially spliced and combined to form a continuous shielding surface. By arranging the bottom positioning part, the middle segment shielding column and the arc shielding part, the paint spraying qualified rate is improved, and the defective rate is reduced by 10%; by arranging the middle segment shielding column in the bolt large hole, the whitening of the inner wall of the bolt hole and the paint floating problem are solved; by shielding the hub part through the arc shielding part, the paint floating and film forming condition of the hub part is improved, and the paint adhesion is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive wheel hub technology, and in particular to a masking tool for color matching of aluminum alloy wheels. Background Technology

[0002] As one of the core components of a car, wheels are increasingly favored by consumers who demand personalization in their vehicle appearance. Two-tone wheels, capable of displaying two or more colors, are gaining popularity due to their diverse color combinations, which significantly enhance the decorative appeal and visual impact of the wheels. Currently, wheel painting generally relies on mechanical equipment to complete the process in a rotating manner. The painting process for two-tone products is more complex, requiring multiple steps to cover the previously cured paint color with subsequent sprays.

[0003] However, there are still shortcomings in the current color-coating process, mainly in terms of coating quality and process stability: on the one hand, the paint pass rate is relatively low, such as... Figure 1 As shown, the wheel hub bolt holes include large bolt holes 100 and small bolt holes 200. Large bolt holes 100 are prone to paint drift, causing the hole walls to turn white and expose the underlying material. This results in noticeable color differences in the appearance of the wheel after color matching, especially in black and white and black and red color matching, severely affecting the visual harmony of the product and making it difficult to meet customer requirements for appearance quality. Furthermore, because the hub area lacks a dedicated shielding structure, paint drift and incomplete film formation are common during paint spraying, leading to decreased paint adhesion in the hub area and failing to meet product performance standards. Summary of the Invention

[0004] To address the above problems, this application provides a masking fixture for aluminum alloy wheels, comprising a bottom positioning part, a middle masking post, and an arc-shaped masking part; the bottom positioning part is located at the lowest end and mates with the small hole of the wheel bolt; the middle masking post is positioned above the bottom positioning part and placed inside the large hole of the bolt; the arc-shaped masking part is positioned above the middle masking post, and the arc-shaped masking part has insertion grooves on its left and right sides, facilitating the circumferential splicing and combination of multiple arc-shaped masking parts to form a continuous masking surface.

[0005] In one embodiment, the bottom positioning part includes a positioning cylinder and a positioning protrusion. The positioning cylinder is inserted into and positioned in accordance with a bolt hole. The positioning protrusion is supported by a spherical or conical structure of the bolt hole.

[0006] In one embodiment, the middle shielding post includes a cylinder and a shielding cone, the shielding cone being used to shield the paint on the inner wall of the bolt hole.

[0007] In one embodiment, the insertion slot is a tongue-and-groove structure that can be interlocked.

[0008] In one embodiment, the bottom positioning part, the middle blocking post, and the arc blocking part are an integrated structure.

[0009] In one embodiment, the roughness of the shielding fixture is RA1.6, and the surface is smooth.

[0010] In one embodiment, the shielding fixture is designed using 3D printing and is made of tetrafluoroethylene.

[0011] The beneficial effects of this utility model are as follows:

[0012] This application discloses a masking fixture for color matching of aluminum alloy wheels. By setting a bottom positioning part, a middle masking post, and an arc-shaped masking part, it improves the paint qualification rate and reduces the defect rate by 10%. By placing the middle masking post inside the bolt hole, it avoids whitening and exposure of the base material on the inner wall of the bolt hole, thus solving the problem of paint drift. By masking the hub with the arc-shaped masking part, it improves the paint film formation of the hub paint layer and enhances paint adhesion. Attached Figure Description

[0013] Figure 1 Top view of the wheel hub;

[0014] Figure 2 This is a cross-sectional view of the wheel hub;

[0015] Figure 3 This is a schematic diagram of the structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the assembled structure of this utility model;

[0017] Explanation of symbols in the diagram:

[0018] 100, large bolt hole; 200, small bolt hole;

[0019] 1. Bottom positioning part; 11. Positioning cylinder; 12. Positioning protrusion;

[0020] 2. Mid-section shielding column; 21. Cylinder; 22. Shielding cone;

[0021] 3. Arc-shaped shielding part; 31. Insertion groove. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0023] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] like Figure 1-4 As shown, a masking fixture for aluminum alloy wheels includes a bottom positioning part 1, a middle masking post 2, and an arc-shaped masking part 3. The bottom positioning part 1 is located at the lowest end and cooperates with the small hole 200 of the wheel bolt. The middle masking post 2 is located above the bottom positioning part 1 and is placed inside the large hole 100 of the bolt. The arc-shaped masking part 3 is located above the middle masking post 2, and the arc-shaped masking part 3 has insertion grooves 31 on its left and right sides, so that multiple arc-shaped masking parts 3 can be spliced ​​together in the circumferential direction to form a continuous masking surface.

[0025] Specifically, the bottom positioning part 1 is located at the lowest end, the middle section shielding post 2 is positioned above the bottom positioning part 1 and is placed inside the bolt hole 100; the arc-shaped shielding part 3 is positioned above the middle section shielding post 2 and connected to the middle section shielding post 2, and the left and right sides of the arc-shaped shielding part 3 are provided with insertion slots 31, and multiple arc-shaped shielding parts 3 can be spliced ​​together circumferentially by means of the insertion slots 31. When the shielding fixture is used, the bottom positioning part 1 is engaged with the wheel bolt hole 200 to play a positioning role; the middle section shielding post 2 forms a shield against the hole wall inside the bolt hole 100; the arc-shaped shielding parts 3 form a continuous shielding surface by splicing to shield the hub, thereby preventing paint from being sprayed onto areas that do not need to be painted during the painting process. In this application, by setting the bottom positioning part 1, the middle section shielding post 2 and the arc shielding part 3, the paint quality pass rate is improved and the defect rate is reduced by 10%; by placing the middle section shielding post 2 inside the bolt hole 100, the whitening of the inner wall of the bolt hole and the exposure of the base material are avoided, and the problem of paint drift is solved; by shielding the hub with the arc shielding part 3, the paint drift film formation of the hub is improved and the paint adhesion is enhanced.

[0026] like Figure 3 As shown, the bottom positioning part 1 includes a positioning cylinder 11 and a positioning protrusion 12. The positioning cylinder 11 is inserted into the bolt hole 200 and its position is defined. The positioning protrusion 12 is supported by the spherical or conical structure of the bolt hole.

[0027] Specifically, the positioning cylinder 11 has a diameter of 11.9 mm and a height of 5 mm, and the positioning protrusion 12 has a diameter of 24 mm. The positioning cylinder 11 in the bottom positioning part 1 is inserted into the bolt hole 200 and its position is defined, which can accurately fix the radial position of the tooling on the wheel and prevent the tooling from shifting during the painting process. The spherical or conical structure of the positioning protrusion 12 supports and cooperates with the bolt hole, which can enhance the stability of the contact between the tooling and the wheel.

[0028] like Figure 3 As shown, the middle section shielding column 2 includes a cylinder 21 and a shielding cone 22, and the shielding cone 22 is used to shield the paint on the inner wall of the bolt large hole 100.

[0029] Specifically, the cylinder 21 has a diameter of 20mm and a length of 50mm; the shielding cone 22 has a maximum diameter of 29mm and a minimum diameter of 20mm, and is used to shield the paint on the inner wall of the wheel bolt large hole 100. The cylinder 21 of the middle shielding column 2 can be stably placed inside the bolt large hole 100, providing vertical support for the overall tooling and preventing the tooling from collapsing during painting; while the shielding cone 22 can accurately cover the inner wall of the bolt large hole 100, specifically shielding the paint in this area, effectively preventing different colors of paint from mixing and forming color differences, solving the problem of color inconsistency at the hole wall of the bolt large hole 100 in traditional processes, and at the same time eliminating the need for additional gray-white primer, reducing paint thickness, helping to improve the adhesion between paint layers, and reducing the risk of paint chipping during CNC precision machining caused by multiple painting and baking.

[0030] like Figure 1 As shown, the insertion groove 31 is a concave-convex structure that can be tenoned together.

[0031] Specifically, the interlocking groove 31 adopts a tongue-and-groove structure that allows for mutual tenoning. When multiple arc-shaped shielding parts 3 are spliced ​​together circumferentially, the tongue-and-groove structure can precisely interlock, ensuring a tight fit at the joint and preventing gaps. This effectively prevents paint from seeping into the gaps during the painting process, ensuring the integrity of the masking. At the same time, the tenon-and-groove structure enhances the overall stability of the combined multiple arc-shaped shielding parts 3, making it less prone to relative displacement during painting, baking, and other processes. This maintains the shape of the continuous masking surface, further improving the masking effect and providing reliable support for ensuring the quality and performance requirements of the color matching.

[0032] like Figure 3 As shown, the bottom positioning part 1, the middle blocking post 2, and the arc blocking part 3 are an integrated structure.

[0033] Specifically, the bottom positioning part 1, the middle blocking column 2 and the arc blocking part 3 adopt an integrated structure, which can significantly enhance the overall structural strength and stability of the tooling, avoid relative displacement between the parts during use due to loose connections, and ensure accurate and reliable positioning, blocking and other functions.

[0034] like Figure 3 , 4 As shown, the roughness of the shielding fixture is RA1.6, and the surface is smooth.

[0035] Specifically, the roughness of the masking tool is RA1.6, and the surface is smooth. The smooth surface makes it difficult for paint to adhere to the surface of the tool, making it easier to clean paint residue later. This reduces cleaning time and workload and ensures the reusability of the tool.

[0036] like Figure 3 , 4 As shown, the shielding fixture is designed using 3D printing and is made of polytetrafluoroethylene (PTFE).

[0037] Specifically, the shielding fixture is designed using 3D printing, ensuring dimensional accuracy and assembly compatibility of each component while reducing processing difficulty and errors. The PTFE material can withstand temperatures up to 220℃, allowing it to be baked and cured along with the wheel after painting, eliminating the risk of secondary paint contamination from removal. It is lightweight, has moderate hardness, and will not scratch or damage the aluminum alloy bolt holes of the wheel. For paint thicknesses exceeding 2 mm, paint remover can be used to remove the entire layer of paint adhering to the surface; the PTFE material is acid and alkali resistant, leaving no residue and causing no corrosion.

[0038] This application discloses a masking fixture for color matching of aluminum alloy wheels. When in use, the bottom positioning part 1 engages with the small hole 200 of the wheel bolt for positioning; the middle masking post 2 forms a mask against the inner wall of the large bolt hole 100; and the arc-shaped masking part 3, through splicing, forms a continuous masking surface to mask the hub, thereby preventing paint from spraying onto areas that do not need painting during the painting process. In this application, by setting the bottom positioning part 1, the middle masking post 2, and the arc-shaped masking part 3, the paint quality rate is improved, reducing the defect rate by 10%; the middle masking post 2, placed inside the large bolt hole 100, prevents the inner wall of the bolt hole from turning white and exposing the substrate, solving the problem of paint drift; and the arc-shaped masking part 3, by masking the hub, improves the paint film formation and adhesion of the paint layer on the hub.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A masking fixture for color matching of aluminum alloy wheels, comprising a bottom positioning part (1), a middle masking post (2), and an arc-shaped masking part (3); the bottom positioning part (1) is located at the lowest end and cooperates with the small hole (200) of the wheel bolt; the middle masking post (2) is disposed above the bottom positioning part (1) and placed inside the large hole (100) of the bolt; the arc-shaped masking part (3) is disposed above the middle masking post (2), characterized in that, The arc-shaped shielding part (3) is provided with insertion slots (31) on the left and right sides, so that multiple arc-shaped shielding parts (3) can be spliced ​​together in the circumferential direction to form a continuous shielding surface.

2. The masking fixture for color matching of aluminum alloy wheels according to claim 1, characterized in that, The bottom positioning part (1) includes a positioning cylinder (11) and a positioning protrusion (12). The positioning cylinder (11) is inserted into the bolt hole (200) and its position is defined. The positioning protrusion (12) is supported by the spherical or conical structure of the bolt hole.

3. The masking fixture for color matching of aluminum alloy wheels according to claim 1, characterized in that, The middle section shielding column (2) includes a cylinder (21) and a shielding cone (22), the shielding cone (22) being used to shield the paint on the inner wall of the bolt large hole (100).

4. The masking fixture for color matching of aluminum alloy wheels according to claim 1, characterized in that, The insertion groove (31) is a concave-convex structure that can be tenoned together.

5. The masking fixture for color matching of aluminum alloy wheels according to claim 1, characterized in that, The bottom positioning part (1), the middle section blocking post (2) and the arc blocking part (3) are an integrated structure.

6. The masking fixture for color matching of aluminum alloy wheels according to claim 1, characterized in that, The surface roughness of the shielding fixture is RA1.6, and the surface is smooth.

7. The masking fixture for color matching of aluminum alloy wheels according to claim 1, characterized in that, The shielding fixture is designed using 3D printing and is made of tetrafluoroethylene.

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