Surface treatment process

Abstract

The invention provides a surface treatment process which is used for carrying out surface treatment on a workpiece with a sand blasting surface and a highlight surface, and the surface treatment process comprises the following steps: carrying out anodic oxidation treatment on the sand blasting surface; carrying out highlight wire drawing treatment on the highlight surface through the passivated cutter, and carrying out anodic film removal treatment on the sand blasting surface subjected to anodic oxidation treatment so as to clean a residual oxidation layer; performing anode dyeing treatment on the sand blasting surface subjected to anode film removal treatment and the highlight surface subjected to highlight wiredrawing treatment so as to obtain the highlight surface and the sand blasting surface which are consistent in color; the sandblasting surface is firstly subjected to anodic oxidation, then the anodic film is removed, and finally the sandblasting surface and the highlight surface are subjected to anodic dyeing together, so that the sandblasting surface and the highlight surface can achieve the effect of consistent color after final dyeing, meanwhile, the highlight surface is subjected to highlight wiredrawing treatment by adopting a passivated cutter, the glossiness of the highlight surface is improved, and the service life of the highlight surface is prolonged. The highlight effect of the highlight surface is guaranteed on the basis that the gravel texture of the sand blasting surface is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of surface treatment technology, and in particular to a surface treatment process. Background Art

[0002] In the surface treatment of workpieces having a sandblasted surface and a high-gloss surface, the workpiece needs to simultaneously meet the requirements of a high-gloss surface and a sandblasted surface with a gravel texture; in the related art, the workpiece is surface treated by adopting a pre-anodizing process, which includes multiple processes such as grinding, sandblasting, anodizing, deanodizing, anodizing, sealing, etc.; however, in the related art, in order to improve the efficiency of the surface treatment of the workpiece, only one anodizing treatment is adopted, which results in that when processing workpieces having both a sandblasted surface and a high-gloss surface, the treatment effects of both surfaces cannot be taken into account at the same time. Specifically, if the processing parameters are used to ensure the brightness of the sandblasted surface, the brightness of the high-gloss surface will be reduced. If the processing parameters are used to ensure the brightness of the high-gloss surface, the texture of the sandblasted surface will be affected. Summary of the Invention

[0003] The present application provides a surface treatment process to at least solve the above-mentioned problems in the related art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solution: a surface treatment process for performing surface treatment on a workpiece having a sandblasted surface and a high-gloss surface, characterized in that the surface treatment process comprises:

[0005] performing anodizing treatment on the sandblasted surface;

[0006] Performing a high-gloss brushing treatment on the high-gloss surface by using a passivated tool to enhance the glossiness of the high-gloss surface;

[0007] Performing a de-anodizing treatment on the sandblasted surface after anodizing treatment and the high-gloss surface after high-gloss brushing treatment to clean the residual oxide layer;

[0008] The sandblasted surface treated with the deanodic film and the high-gloss surface treated with the high-gloss brushed are subjected to an anodic dyeing treatment to obtain a high-gloss surface and a sandblasted surface with consistent colors.

[0009] In one embodiment, the roughness of the tool passivation treatment is 0.5Ra-0.6Ra.

[0010] In one embodiment, the rake angle of the knife blade is set to 10°-14°.

[0011] In one embodiment, the blade radius of the tool is 0.02-0.05 mm.

[0012] In one possible implementation manner, when the tool processes the highlight surface, a fine processing path parallel to the hairline is adopted, and the overlap of the processing paths is higher than 80%.

[0013] In one embodiment, when the tool processes the high-gloss surface, the cutting speed of the tool is 16000 r / min-20000 r / min, and the feed rate of the tool is 200 mm / rev-300 mm / rev.

[0014] In one embodiment, when the tool processes the high-gloss surface, the tool is cooled and lubricated by a cooling medium.

[0015] In one embodiment, the thickness of the oxide layer on the sandblasted surface after the anodizing treatment is 1-2 microns.

[0016] In one embodiment, the thickness of the colored oxide layer on the sandblasted surface and the high-gloss surface after the anodic dyeing treatment is 5-8 microns.

[0017] In one possible implementation manner, the sandblasted surface and the high-gloss surface after the anodic dyeing treatment are sealed.

[0018] In the above surface treatment process, the sandblasted surface is first anodized, then the anodized film is removed, and finally anodized together with the high-gloss surface, so that the sandblasted surface and the high-gloss surface can achieve a consistent color effect after the final dyeing. At the same time, the high-gloss surface is subjected to a high-gloss brushed treatment using a passivated tool, which improves the gloss of the high-gloss surface and achieves a high-gloss effect on the high-gloss surface while ensuring the gravel texture of the sandblasted surface.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present application are shown in an illustrative and non-limiting manner, in which:

[0021] In the drawings, the same or corresponding reference numerals denote the same or corresponding parts.

[0022] Figure 1 The effect diagram of the sandblasted surface and the highlight surface of the workpiece in the embodiment of the present application is shown;

[0023] Figure 2 A flow chart of the surface treatment process in an embodiment of the present application is shown;

[0024] Figure 3 A brightness comparison table is shown after highlight drawing on the highlight surface using tools with different parameters in the embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, features, and advantages of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0026] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved. This is not limited herein.

[0027] Furthermore, 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 being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0028] The following describes in detail the various embodiments of the present application in conjunction with the accompanying drawings.

[0029] Please refer to Figure 1 , Figure 1 These are the renderings of the sandblasted surface and the high-gloss surface of the workpiece in the embodiments. Some embodiments of the present application provide a surface treatment process for performing surface treatment on a workpiece having a sandblasted surface and a high-gloss surface. For example, the workpiece may be a mobile phone housing or a laptop computer housing. Specifically, the material of the workpiece may be aluminum.

[0030] It can be understood that the sandblasted surface of the workpiece is formed by a sandblasting process, wherein the sandblasting process adopts existing technical means, and the high-gloss surface of the workpiece is formed by a machining or grinding process, wherein the machining or grinding process adopts existing technical means.

[0031] Please refer to Figure 2 , Figure 2 This is a flow chart of a surface treatment process in an embodiment. In some embodiments, the surface treatment process of a workpiece includes:

[0032] Step S1: Anodize the sandblasted surface to ensure that the sandblasted surface is not affected by subsequent treatments.

[0033] Step S2: Using a passivated tool, the high-gloss surface is subjected to a high-gloss brushing process to enhance the glossiness of the high-gloss surface, thereby making the high-gloss surface have a higher reflective effect;

[0034] It can be understood that gloss is used to characterize the specular reflection ability of a surface to light and is an optical property. The stronger the specular reflection, the higher the gloss.

[0035] S3, performing a de-anodizing treatment on the sandblasted surface after anodizing treatment and the high-gloss surface after high-gloss brushing treatment to clean the residual oxide layer;

[0036] S4. Anodizing the sandblasted surface after deanodization and the high-gloss surface after high-gloss brushing to obtain high-gloss surface and sandblasted surface with consistent color.

[0037] In the above surface treatment process, the sandblasted surface is first anodized, then the anodized film is removed, and finally anodized together with the high-gloss surface, so that the sandblasted surface and the high-gloss surface can achieve a consistent color effect after the final dyeing. At the same time, the high-gloss surface is subjected to a high-gloss brushed treatment using a passivated tool, which improves the gloss of the high-gloss surface and achieves a high-gloss effect on the high-gloss surface while ensuring the gravel texture of the sandblasted surface.

[0038] In some embodiments of step S1, the thickness of the oxide layer on the sandblasted surface after anodizing is 1-2 microns. Thus, by controlling the thickness of the oxide layer on the sandblasted surface after anodizing to 1-2 microns, the process time can be reduced while effectively ensuring the uniformity and quality of the sandblasted surface. When the thickness of the oxide layer is less than 1 micron, the oxide layer is thin and the protective effect on the sandblasted surface is poor. When the thickness of the oxide layer is greater than 2 microns, the anodizing process time is long, which reduces the efficiency of the oxidation treatment process in this application.

[0039] Furthermore, the parameters of the anodizing treatment are adjusted to generate an oxide layer with a thickness of 1-2 microns.

[0040] Preferably, in the parameter configuration of the anodizing treatment, the electrolyte composition is sulfuric acid with a concentration controlled at 15%-20%, and the temperature is maintained at 16-18°C to avoid temperature fluctuations that lead to uneven oxide layers; the operating voltage is stabilized at 14.5V, the treatment time is 20 minutes, and the growth rate of the oxide layer is controlled by a constant voltage mode; the workpiece is made of aluminum material and serves as the anode, and the cathode is a lead plate or graphite. The anode and cathode area ratio is set to 1:1.5 to ensure uniform current distribution. In this way, the anodizing treatment using the above parameter configuration can stably obtain an oxide layer with a thickness of 1-2 microns.

[0041] In some embodiments of step S2, the roughness of the tool passivation treatment is 0.5Ra-0.6Ra. In this way, by precisely controlling the roughness of the tool passivation treatment, it is possible to ensure that a uniform and high-quality glossiness is obtained when the high-gloss surface is subjected to high-gloss brushing treatment.

[0042] Furthermore, the roughness of the tool passivation treatment is controlled within the range of 0.5Ra-0.6Ra. Chemical passivation or mechanical passivation can be used to achieve the required roughness standard. For example, chemical passivation can be achieved by controlling the concentration of the passivation solution and the treatment time; or mechanical passivation can be finely controlled by selecting the appropriate passivation tool and process parameters; or a combination of the two passivation methods can ensure the stability and consistency of the roughness.

[0043] In some embodiments of step S2 , the blade parameters of the tool are optimized, and the processing parameters of the tool are optimized.

[0044] Furthermore, the rake angle of the tool blade is set to 10°-14°. Thus, by setting the rake angle of the tool blade to 10°-14°, the efficiency and effect of the tool in performing high-gloss brushing on the high-gloss surface are optimized, thereby improving the gloss of the high-gloss surface. At the same time, by setting the appropriate rake angle, the resistance during the processing can be reduced, the processing accuracy and surface quality can be improved, and ultimately a high-gloss high-gloss surface can be achieved. For example, the rake angle can be 10°, 11°, 12°, 13°, or 14°.

[0045] Specifically, the rake angle of the tool blade is set to 10°-14°, which can be achieved in the following ways. For example, a CNC machine tool is used to accurately set the angle of the tool; or a standard tool with a specific rake angle is used; or a tool with a specific rake angle is produced by a custom tool manufacturer.

[0046] Furthermore, the blade radius of the tool is 0.02-0.05mm. Thus, by setting the blade radius of the tool within the range of 0.02-0.05mm, it is easy to ensure that the tool has high precision and stability when performing high-gloss wire drawing, thereby improving the glossiness of the high-gloss surface. At the same time, by controlling the blade radius, the high-gloss surface can be processed more carefully and evenly, avoiding the problem of surface unevenness caused by the tool being too large or too small. For example, the blade radius can be 0.02mm, 0.03mm, 0.04mm or 0.05mm.

[0047] It is understood that the blade radius of the tool is 0.02-0.05mm. This range is set to achieve the best precision and effect during the processing, thus taking into account both processing effect and processing efficiency. Specifically, when the blade radius is less than 0.02mm, the tool can perform very fine processing and is suitable for surface treatment requiring extremely high finish. However, a smaller blade radius will result in lower processing efficiency. When the blade radius is greater than 0.05mm, it is suitable for uniform processing of a larger area and can improve processing efficiency. However, the finish of the high-gloss surface processed will be reduced.

[0048] Furthermore, when the tool processes the highlight surface, a fine processing path parallel to the hairline is adopted, and the overlap of the processing path is higher than 80%; in this way, by adopting a fine processing path parallel to the hairline and ensuring that the overlap of the processing path is higher than 80%, the high overlap processing path design can ensure that each part of the surface is fully processed, thereby improving the surface gloss and consistency.

[0049] Specifically, a fine machining path parallel to the hairline can be achieved by adjusting the tool's trajectory. For example, the tool's trajectory on the highlight surface should remain parallel to the hairline, and each movement distance should be less than the tool width to ensure an overlap greater than 80%. For example, each tool movement distance can be set to within 20% of the tool width to ensure at least 80% overlap. The tool's machining path can be precisely controlled by a CNC machine tool to ensure accuracy and consistency.

[0050] Furthermore, when the tool processes the highlight surface, the cutting speed of the tool is 16000r / min-20000r / min, and the feed rate of the tool is 200mm / rev-300mm / rev.

[0051] By setting specific ranges for cutting speed and feed rate when machining high-gloss surfaces, the tool can effectively control process parameters. The cutting speed ranges from 16,000 rpm to 20,000 rpm, and the feed rate ranges from 200 mm / rev to 300 mm / rev. Controlling these parameters helps optimize the polishing effect and ensure a high gloss finish. This parameter setting avoids the negative effects of excessively high or low cutting speeds and feed rates on the high-gloss surface, thereby ensuring the quality and gloss of the high-gloss surface.

[0052] Please refer to Figure 3 , Figure 3 This is a brightness comparison table after highlight drawing on the highlight surface using tools with different parameters in the embodiment.

[0053] In comparative example 1, the tool parameters are: diameter 16 mm, rotation speed 18000 r / min, feed rate 300 mm / rev, roughness 0.19 Ra, and the glossiness of the processed high-gloss surface is 190-220 GU.

[0054] In comparative example 2, the tool parameters are improved in terms of tool diameter, feed rate and roughness compared to comparative example 1. Specifically, the tool parameters are adjusted to: diameter of 10 mm, rotation speed of 18,000 r / min, feed rate of 200 mm / rev, roughness of 1.2 Ra, and the glossiness of the processed high-gloss surface is 250-290 GU.

[0055] In the experimental example, the tool parameters were improved in terms of feed rate and roughness compared to comparative example 1. Specifically, the tool parameters were adjusted to: diameter 10 mm, rotation speed 18,000 r / min, feed rate 200 mm / rev, roughness 1.2 Ra, and the glossiness of the processed high-gloss surface was 360-400 GU, which was qualified and could meet the requirements.

[0056] In some embodiments of step S2 , when the tool processes the highlight surface, the tool is cooled and lubricated by a cooling medium.

[0057] In this way, the use of cooling medium can reduce the temperature of the tool, reduce tool wear and workpiece surface damage caused by high temperature, while lubrication can reduce friction, improve processing quality and efficiency, thereby ensuring that the high-gloss surface has high gloss and good surface quality.

[0058] Specifically, the cooling medium can be an emulsified coolant, whose main components are water and oil. The oil is dispersed in water using an emulsifier to form a stable emulsion. Emulsified coolant not only provides excellent cooling but also provides excellent lubrication, thereby reducing friction between the tool and workpiece surface, lowering cutting forces, and improving the finish and quality of the machined surface. When using an emulsified coolant, it can be evenly sprayed through a nozzle onto the contact area between the tool and workpiece, ensuring uniform cooling and lubrication. Furthermore, the coolant flow rate and spray angle can be adjusted according to specific processing requirements to achieve optimal cooling and lubrication.

[0059] In some embodiments of step S4, the thickness of the colored oxide layer on the sandblasted surface and the high-gloss surface after anodic dyeing is 5-8 microns. Thus, by controlling the oxide layer thickness within the range of 5-8 microns, the colored oxide layer thickness can ensure that the sandblasted surface and the high-gloss surface have the same color after anodic dyeing, and is easy to achieve.

[0060] Furthermore, by adjusting the parameter configuration of the anodic dyeing process, a high-gloss surface and a sandblasted surface with a uniform color of the colored oxide layer and a thickness of 5-8 microns can be obtained.

[0061] Preferably, in the parameter configuration of the anodic dyeing treatment, the acid dye is mixed with the inorganic colorant at a concentration of 0.5%-1%, the electrolyte uses sulfuric acid with a concentration of 15%-20%, the dyeing temperature is 40-45 degrees Celsius, and the treatment time is 50 minutes.

[0062] It can be understood that the anodic dyeing treatment includes anodic oxidation and dyeing treatment, and a porous and dense oxide layer is generated on the surface of the workpiece through electrochemical reaction to achieve oxidation treatment, and the porous characteristics of the oxide layer are used to adsorb dyes to achieve dyeing treatment.

[0063] The surface treatment process includes step S5, wherein the sandblasted surface and the high-gloss surface after the anodic dyeing treatment are sealed. In this way, by sealing the pores of the oxide layer formed after the anodic dyeing treatment, the corrosion resistance and weather resistance of the oxide layer are improved, the colored oxide layer of the sandblasted surface and the high-gloss surface is ensured to be stable, and the oxide layer is prevented from being damaged during subsequent use, thereby effectively improving the stability and consistency of the workpiece surface treatment.

[0064] Furthermore, there is no limitation on the implementation method of the sealing treatment. For example, the sealing treatment is performed by hot water sealing, which is to place the anodic oxide film in boiling water to hydrate the aluminum oxide to form aluminum hydroxide with a stable structure to seal the pores, thereby achieving sealing; or the sealing treatment is performed by steam sealing, which is to use high-temperature steam to treat the anodic oxide film to achieve sealing; or the sealing treatment is performed by inorganic sealing agent sealing, which is to treat the oxide film with an inorganic salt solution such as nickel nitrate or cobalt nitrate to fill its pores, thereby achieving sealing; or the sealing treatment is performed by organic sealing agent sealing, which is to use a polymer solution to treat the oxide film to form a protective layer, thereby achieving sealing.

[0065] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A surface treatment process for surface treatment of a workpiece having a sandblasted surface and a high-gloss surface, characterized in that: The surface treatment process includes: performing anodizing treatment on the sandblasted surface; Performing a high-gloss brushing treatment on the high-gloss surface by using a passivated tool to enhance the glossiness of the high-gloss surface; Performing a de-anodizing treatment on the sandblasted surface after anodizing treatment and the high-gloss surface after high-gloss brushing treatment to clean the residual oxide layer; The sandblasted surface treated with the deanodic film and the high-gloss surface treated with the high-gloss brushed are subjected to an anodic dyeing treatment to obtain a high-gloss surface and a sandblasted surface with consistent colors.

2. The surface treatment process according to claim 1, characterized in that: The roughness of the tool passivation treatment is 0.5Ra-0.6Ra.

3. The surface treatment process according to claim 1, characterized in that: The rake angle of the knife blade is set to 10°-14°.

4. The surface treatment process according to claim 1, characterized in that: The blade radius of the tool is 0.02-0.05 mm.

5. The surface treatment process according to claim 1, characterized in that: When the tool processes the high-gloss surface, a fine processing path parallel to the hairline is adopted, and the overlap of the processing paths is higher than 80%.

6. The surface treatment process according to claim 1, characterized in that: When the tool processes the high-gloss surface, the cutting speed of the tool is 16000r / min-20000r / min, and the feed rate of the tool is 200mm / rev-300mm / rev.

7. The surface treatment process according to claim 1, characterized in that: When the tool processes the high-gloss surface, the tool is cooled and lubricated by a cooling medium.

8. The surface treatment process according to claim 1, characterized in that: The thickness of the oxide layer on the sandblasted surface after the anodic oxidation treatment is 1-2 microns.

9. The surface treatment process according to claim 1, characterized in that: The thickness of the colored oxide layer on the sandblasted surface and the high-gloss surface after the anodic dyeing treatment is 5-8 microns.

10. The surface treatment process according to claim 1, characterized in that: The sandblasted surface and the high-gloss surface after the anodic dyeing treatment are sealed.

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