A precision matching coating process for carbon fiber products

Abstract

The invention discloses a precise matching coating process for carbon fiber products, which is used for controlling the assembly gap of accessories at the assembly position after the carbon fiber products are coated, and comprises the following steps: assembling a repair jig at the assembly position; filling glue into the gap between the repair jig and the assembly position; baking the carbon fiber product, and removing the repair jig after baking; shaping and grinding the assembly position by using a grinding jig; placing a profiling spray-shielding jig at the assembly position, and spraying the carbon fiber product; baking the carbon fiber product after painting, and removing the profiling spray-shielding jig after baking; laying a flat profiling paper on the bottom surface of the assembly position, spraying the inner wall of the assembly position, and baking the carbon fiber product after painting. The process can achieve the effect of precise matching coating, and can meet the requirements of the inner wall of the assembly position being painted, the edge being free of burrs and irregular sawtooth, the assembly gap being uniform in precision, and the assembly gap being controlled.

Description

Technical Field

[0001] The invention relates to the technical field of carbon fiber products, and in particular to a precise matching coating process for carbon fiber products. Background Art

[0002] Carbon fiber products are composite materials made from carbon fiber prepreg through stamping, pultrusion, injection molding, and other processes. After the molding process is completed, the product needs to go through spraying, assembly of accessories, and other processes in subsequent production. At present, the painting process requirements for accessories on the assembly parts of carbon fiber products are as follows: the inner wall of the assembly part is required to be painted, and the edge is required to be free of irregular serrations, the assembly gap accuracy is uniform, and the assembly gap needs to be controlled within a certain range. There are many shortcomings in the existing painting process, including: the thickness of the paint sag on the inner wall of the assembly part is difficult to control; serrations and burrs are prone to occur on the mating surface ports of the assembly part; the painting cost is high, the design of tooling and fixtures is complex, and the assembly gap accuracy cannot be guaranteed. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a precise matching coating process for carbon fiber products. The process uses a repair jig, a profiling spray jig, a flat profiling paper combined with a filling glue, a grinding process, etc. to achieve the effect of precise matching coating, meet the requirements of the inner wall of the assembly part, no burrs and irregular saw teeth on the edge, uniform assembly gap accuracy, and assembly gap control within a certain range, and reduce costs while improving the product coating precision.

[0004] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0005] A carbon fiber product precision matching coating process is used to control the assembly gap of accessories at the assembly position after the carbon fiber product is coated, and comprises the following steps:

[0006] (1) Designing and assembling a repair jig: designing a repair jig according to the assembly gap of the accessory at the assembly position of the carbon fiber product, and assembling the repair jig at the assembly position;

[0007] (2) Glue filling: Fill the gap between the repair jig and the assembly part with glue, and clean up the overflowed glue;

[0008] (3) Baking: Baking the carbon fiber product, and after baking, removing the repair jig;

[0009] (4) Grinding: Use a grinding jig to shape and grind the assembly parts;

[0010] (5) External painting and baking: A profiling spray-blocking jig capable of covering the assembly part is designed according to the shape and size of the accessory or assembly part, the profiling spray-blocking jig is placed in the assembly part, and then the carbon fiber product is sprayed with paint; after spraying, the carbon fiber product is baked, and after baking, the profiling spray-blocking jig is removed;

[0011] (6) Painting the inner wall of the assembly part: Lay the flat contour paper on the bottom surface of the assembly part, spray paint the inner wall of the assembly part, and bake the carbon fiber product after painting.

[0012] Furthermore, before assembling the repair jig, the size of the assembly part is enlarged.

[0013] Furthermore, the size enlargement method is to grind the edge of the assembly part using a grinding tool.

[0014] Furthermore, the size of the repair jig is 0.6 mm larger than the standard inspection size of the accessory.

[0015] Furthermore, the baking temperatures of step (3), step (5) and step (6) are all 75-85° C., and the baking time is all 45-60 min.

[0016] Furthermore, in step (4), after grinding, the accessories are assembled at the assembly location to check their adaptability.

[0017] Furthermore, after step (5) is completed, the sand particles on the painted surface and the droplets generated during the painting are ground using sandpaper.

[0018] Furthermore, the repairing jig and the grinding jig are both made of metal, and the contour-shaping spray jig is made of silicone.

[0019] Furthermore, the process controls the assembly gap between the accessory and the assembly portion of the carbon fiber product to within 0.2 mm.

[0020] The beneficial effects of the present invention are:

[0021] The present invention first places a repair jig in the assembly part, then fills glue into the gap between the repair jig and the assembly part, and uses glue to repair the molding burrs of the assembly part, so that the edge of the assembly part is smooth; when spraying paint outside, a profiling spray-shielding jig is used to cover the assembly part, and then a flat profiling paper is used to cover the bottom plane of the assembly part, and the inner wall of the assembly part is painted. The present invention uses a repair jig, a profiling spray-shielding jig, and a flat profiling paper in combination with processes such as filling glue and grinding to achieve the effect of precise matching painting, meet the requirements of painting the inner wall of the assembly part, no burrs or irregular sawtooth on the edge, uniform assembly gap accuracy, and assembly gap control within a certain range, and reduce the tooling and jig cost and machining cost while improving the product coating precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of the precise matching coating process of the carbon fiber product of the present invention;

[0023] Figure 2 This is a partial structural diagram of a carbon fiber prosthetic product according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The technical solutions in the present invention will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] A carbon fiber product precision matching coating process is used to control the assembly gap of accessories at the assembly position after the carbon fiber product is coated, and comprises the following steps:

[0026] (1) Designing and assembling a repair jig: designing a repair jig according to the assembly gap of the accessory at the assembly position of the carbon fiber product, and assembling the repair jig at the assembly position;

[0027] Before assembling the repair jig, a grinding tool (such as a wind grinding pen) is used to grind the assembly part at 45 degrees to expand the size; after grinding, remove the surface dust and clean it with a cleaning agent;

[0028] Due to product process requirements, the inner wall of the assembly part needs to be painted after painting, and the assembly clearance needs to be controlled within 0.2mm. Therefore, the size of the designed repair fixture is larger than the standard inspection size of the accessory by 0.6mm;

[0029] (2) Glue filling: Fill the gap between the repair jig and the assembly part with glue, and clean up the overflowed glue;

[0030] (3) Baking: Bake the carbon fiber product, and after baking, remove the repair jig; the baking temperature is 75-85°C, and the baking time is 45-60 minutes;

[0031] (4) Grinding: Use a grinding jig to shape and grind the assembly part; after grinding, assemble standard accessories at the assembly part to test its adaptability;

[0032] (5) External painting and baking: a profiling spray-blocking jig capable of covering the assembly part is designed according to the shape and size of the accessory or assembly part, the profiling spray-blocking jig is placed in the assembly part, and then the carbon fiber product is sprayed with paint; after spraying, the carbon fiber product is baked, and after baking, the profiling spray-blocking jig is removed; wherein the baking temperature is 75-85° C. and the baking time is 45-60 min;

[0033] (6) Painting the inner wall of the assembly part: Use sandpaper to grind the sand on the painted surface and the droplets generated during the paint spraying; lay flat profiling paper on the bottom surface of the assembly part, and paint the inner wall of the assembly part. After painting, bake the carbon fiber product at a temperature of 75-85°C for 45-60 minutes to obtain a coated carbon fiber product that meets the assembly clearance requirements of the accessories.

[0034] Among them, the repair jig and the grinding jig are both made of metal, and the contour-shaping spray jig is made of silicone.

[0035] Example

[0036] This embodiment provides a precise matching coating process for carbon fiber prosthetic products. Figure 2 The carbon fiber prosthetic product shown has an assembly part that needs to be equipped with a decorative cover; the decorative cover can enhance the appearance, protect the internal structure, and improve the psychological comfort of the user. The following process takes the assembly part of the carbon fiber prosthetic product that needs to be equipped with a decorative cover as an example. Specifically, Figure 2 In the figure, the assembly part 1 is the assembly hole, and the accessory 2 is the decorative cover.

[0037] The precision matching coating process of this embodiment includes the following steps:

[0038] S1, hole expansion: Use a wind grinding pen to grind the assembly part (assembly hole) of the decorative cover at 45°, and grind the edge of the assembly hole to expand the assembly hole; be careful not to grind off the decorative cover assembly platform during grinding, and reserve a step of more than 0.1mm to ensure that the fixture does not move during glue filling; after hole expansion, remove surface dust and clean it with a detergent.

[0039] S2, design and assemble the repair jig: design the repair jig according to the assembly gap of the accessory on the assembly part of the carbon fiber product to ensure that the repair jig can match the shape set by the process; specifically, due to the product process requirements, the inner wall of the assembly part needs to be painted after painting, and the assembly gap needs to be controlled within 0.2mm, so the size of the designed repair jig is larger than the standard inspection size of the accessory of 0.6mm; assemble the designed repair jig in the assembly hole.

[0040] S3, glue filling: prepare glue and fill the gap between the repair jig and the assembly part with glue, shape the assembly hole according to the jig to avoid carbon fiber burrs and ensure edge smoothness;

[0041] S4, Retouching: Clean up the overflowed glue and ensure that the glue is fully applied to the areas where it is needed.

[0042] S5, baking: push the platform with carbon fiber products into the oven and place them neatly; set the oven temperature to 80±5℃ and bake for 60 minutes; after baking, remove the repair jig.

[0043] S6, Grinding: Use a grinding jig to shape and grind the assembly hole; after grinding, install a standard decorative cover in the assembly hole to check its fit.

[0044] S7, external painting: design a 3D profiling spray-blocking jig that can cover the assembly hole according to the shape and size of the decorative cover or the assembly hole, put the 3D profiling spray-blocking jig into the assembly hole, and then calculate the paint dosage according to the paint ratio, prepare the paint, and filter the paint with 200# filter paper after the paint bubbles are dispersed. Use an air gun to remove dust and then spray paint on the carbon fiber product; put the painted product into a static area (humidity 30%-70% in the static area, temperature 15℃-35℃) and let it stand for 60 minutes; after standing, push the platform with the product into the oven, set the oven at 80±5℃, and bake for 60 minutes; because of the cover of the profiling spray-blocking jig, the paint cannot enter the inner wall of the assembly hole, so there will be no jagged edges.

[0045] S8, Grinding: Use 2000# sandpaper to grind the sand on the paint surface and the drips produced during paint spraying; when trimming the drips, first grind with 1500# sandpaper and then with 2000# sandpaper.

[0046] S9, flat contour paper anti-painting: lay the flat contour paper on the bottom plane of the assembly hole.

[0047] S10, wall painting inside the assembly hole: calculate the amount of paint according to the paint ratio, prepare the paint, and filter the paint with 200# filter paper after the paint bubbles are dispersed; use an air gun to remove dust and then spray paint; put the painted carbon fiber product into a static area (humidity 30%-70%, temperature 15℃-35℃) and let it stand for 60 minutes; after standing, push the platform with the product into the oven, set the oven at 80±5℃, and bake for 60 minutes; at this time, the flat profiling paper only blocks the horizontal bottom surface of the decorative hole, not the inner wall, and the paint enters the inner wall, meeting the requirements for painting the inner wall.

[0048] The precision matching coating process of this carbon fiber prosthetic product can meet the requirements of the inner wall of the assembly hole used to assemble the decorative cover, no burrs or irregular serrations on the edges, uniform assembly gap accuracy, and assembly gap control within 0.2mm; this precision matching coating process can control the paint sag thickness on the mating surface of the assembly hole, and solve the problems of easy serration on the mating surface port, high machining cost, complex tooling and fixture design, and inability to guarantee gap accuracy in conventional processes.

[0049] The precision matching coating process of this embodiment can greatly improve the assembly gap yield of carbon fiber prosthetic products.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A carbon fiber product precision matching coating process, used for controlling the assembly gap of accessories at the assembly position after the carbon fiber product is coated, characterized in that: The steps include: (1) Designing and assembling a repair jig: designing a repair jig according to the assembly gap of the accessory at the assembly position of the carbon fiber product, and assembling the repair jig at the assembly position; (2) Glue filling: Fill the gap between the repair jig and the assembly part with glue, and clean up the overflowed glue; (3) Baking: Baking the carbon fiber product, and after baking, removing the repair jig; (4) Grinding: Use a grinding jig to shape and grind the assembly parts; (5) External painting and baking: A profiling spray-blocking jig capable of covering the assembly part is designed according to the shape and size of the accessory or assembly part, the profiling spray-blocking jig is placed in the assembly part, and then the carbon fiber product is sprayed with paint; after spraying, the carbon fiber product is baked, and after baking, the profiling spray-blocking jig is removed; (6) Painting the inner wall of the assembly part: Lay the flat contour paper on the bottom surface of the assembly part, spray paint the inner wall of the assembly part, and bake the carbon fiber product after painting.

2. The carbon fiber product precision matching coating process according to claim 1 is characterized in that: Before assembling the repair jig, the assembly part is also enlarged.

3. The carbon fiber product precision matching coating process according to claim 2 is characterized in that: The size is enlarged by grinding the edges of the assembly parts using a grinding tool.

4. The carbon fiber product precision matching coating process according to claim 1 is characterized in that: The size of the repair jig is 0.6mm larger than the standard inspection size of the accessory.

5. The carbon fiber product precision matching coating process according to claim 1 is characterized in that: The baking temperatures of step (3), step (5) and step (6) are all 75-85° C., and the baking time is all 45-60 min.

6. The carbon fiber product precision matching coating process according to claim 1 is characterized in that: In step (4), after grinding, the accessories are assembled at the assembly location to check their adaptability.

7. The carbon fiber product precision matching coating process according to claim 1 is characterized in that: After step (5) is completed, the sand particles on the painted surface and the droplets generated during the painting are ground by sandpaper.

8. The carbon fiber product precision matching coating process according to claim 1 is characterized in that: The repairing jig and the grinding jig are both made of metal, and the contour-shaping spray jig is made of silicone.

9. The carbon fiber product precision matching coating process according to claim 1, characterized in that: This process controls the assembly gap between the accessory and the assembly part of the carbon fiber product to within 0.2 mm.

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