Processing method for face frameless case parts

Abstract

To disclose a method for processing face frameless shell materials, the method relating to the technical field of mobile terminal device shell processing.SOLUTION: The method for processing face frameless shell materials includes the steps of: S1 cutting a sheet material; S2 stamping and curling, S3 CNC processing, S4 grinding and cleaning, S5 surface T processing, and S6 nano-injection molding. The present disclosure adopts a stamping method and replaces traditional metal block CNC, which can reduce production costs.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of processing cases for mobile terminal devices, and more particularly to a method for processing face frameless case parts. [Background technology]

[0002] Mobile terminal device cases are primarily made of aluminum. Conventional case components are typically machined using CNC to cut an aluminum block into the required shape, then adding a face frame for assembling the screen. Figure 8 shows a schematic diagram of a conventional mobile terminal device case. The aluminum block is machined using CNC to create a U-shaped face frame, and plastic face frames are attached to both sides of the top of the U-shaped face frame to attach the case to the surface of the mobile terminal device. This process results in high production costs. Furthermore, because metal materials block signals, a slot must be created to expose the antenna via injection molding. Nano-injection molding is typically used, but this process has the disadvantage of injection-molded parts easily falling off. Therefore, a method for processing face frameless case components is needed. Summary of the Invention [Problem to be solved by the invention]

[0003] The object of the present invention is to provide a method for processing face frameless case parts, which has the advantages of reducing production costs, simplifying the assembly process, and preventing plastic parts from falling off the surface of the U-shaped outer frame, and solves the problems described in the background art above. [Means for solving the problem]

[0004] In order to achieve the above object, the present invention provides: Plate cutting: Step S1 in which an aluminum plate is pre-cut into a basic shape for processing a face frameless case part; Punching and hemming: The cut plate material is punched using a punching machine, and in the punching process, the frame is thickened and the inward U-shaped frame is unwound in step S2; CNC processing: Step S3: opening an antenna slot on the surface of the U-shaped frame and creating a step structure for assembling a screen on the U-shaped frame; Polishing and cleaning: Step S4 to remove burrs and dirt on the surface of the U-shaped frame; Surface T treatment: Step S5 of oxidizing the surface of the U-shaped frame to form minute pores on the surface of the U-shaped frame; Nano injection molding: Step S6: molding the antenna slot and other plastic parts on the surface of the U-shaped frame by nano injection molding.

[0005] Preferably, the plate cutting in step S1 is Step S101: determining the cutting size and shape of the aluminum plate according to the design requirements of the case of the mobile terminal device; Step S102: folding the aluminum plate material into a desired shape using a folding device; Step S103: Using an aluminum plate cutting tool to cut the aluminum plate according to design requirements; and step S104 of unfolding the aluminum plate along the cutting direction and trimming the edges of the aluminum plate to achieve the designed gloss and surface quality.

[0006] Preferably, when cutting the aluminum plate in step S103, the aluminum plate is cut from the front side, and the aluminum plate is cut out along the contour of the tool.

[0007] Preferably, the punching and hemming of the aluminum plate material in step S2 is performed as follows: Step S201: placing the cut aluminum plate into a lower cavity of a punching machine, moving an upper die of the punching machine downward to punch and form the aluminum plate, stretching and thinning the aluminum plate, and forming thick side portions at the edges; Step S202: After punching the aluminum plate material into a U-shaped frame, two sets of push-type broaches in the punching machine are used to punch out both sides of the U-shaped frame, forming a hemmed portion at the top of the U-shaped frame; and step S203 of pushing the U-shaped frame out of the lower cavity after stamping.

[0008] Preferably, the CNC machining in step S3 is Milling and rough machining of adhesive receiving position: Step S301, in which the injection molded inner surface of the case part is machined using a 3-axis CNC, and the machined outer surface is used as the XY reference surface for the subsequent process, with an outer surface tolerance of +0.05~-0.03; Milling the slot: Step S302, which uses 3-axis CNC to machine the front features of the case part before injection molding; Milling the Outline and Camera: Step S303, where the outline and camera features of the case parts are finished by 3-axis CNC; Milling the recess of the internal cavity: Step S304: Milling the internal cavity of the case part by three-axis CNC so that the flatness of the internal cavity of the case part after machining is 0.15; Milling of short side holes: Milling the short side holes of the case part by 4-axis CNC, and during the milling, a large flat magnetic carbide press block is used to perform internal positioning on the case part; step S305; Milling the long side holes: Milling the long side holes of the case parts by 4-axis CNC, and during the milling, use a large flat magnetic carbide press block to perform internal positioning on the case parts; step S306; High gloss processing: Step S307 involves using 3-axis CNC to chamfer the top and bottom of the case parts to achieve high gloss.

[0009] Preferably, the polishing and cleaning of the U-shaped frame in step S4 is carried out by Surface cleaning: Step S401: using a high-pressure air gun to purge and clean the dust and foreign matter on the surface of the U-shaped frame; Applying a cleaning agent: Applying a cleaning agent to the part of the surface of the U-shaped frame where burrs and dirt exist, specifically, a sodium hydroxide solution, step S402; Surface cleaning: Step S403 includes applying the cleaning agent and then rinsing it with running water to clean the burrs and dirt on the surface of the U-shaped frame and remove any cleaning agent residue and oil.

[0010] Preferably, after cleaning the burrs and dirt on the surface of the U-shaped frame in step S4, the surface of the U-shaped frame is further washed with an alkaline cleaner to remove the oxide layer and paint remaining on the surface of the U-shaped frame.

[0011] Preferably, the surface T treatment of the U-shaped frame in step S5 is Step S501: In a vacuum high-temperature environment, a reaction occurs at the interface between the oxide and aluminum and the oxide on the surface of the U-shaped frame to produce aluminum oxide and zinc oxide; Step S502: A secondary reaction is caused between aluminum oxide and zinc oxide on the surface of the U-shaped frame under room temperature heating conditions to form micropores; Step S503: controlling the oxidation process to control the size and shape of the pores on the surface of the U-shaped frame; Step S504 includes subjecting the U-shaped frame to an electroplating process to protect the micropores on its surface and prevent the aluminum oxide and zinc oxide from further reacting with the aluminum and oxide.

[0012] Preferably, controlling the oxidation process in step S503 includes: The size and shape of the micropores can be controlled by changing the oxidation temperature; the lower the oxidation temperature, the smaller the pores, and the higher the oxidation temperature, the larger the pores; The size and shape of the micropores can be controlled by changing the oxidation time; the longer the oxidation time, the smaller the pores, and the shorter the oxidation time, the larger the pores. The size and shape of the micropores can be controlled by changing the oxidation atmosphere; when oxidation is performed in normal air, large pores are formed, and when oxidation is performed under vacuum conditions, aluminum oxide is mainly formed and small pores are formed.

[0013] Preferably, the nano injection molding in step S6 specifically includes: Step S601: cleaning foreign matter, oil stains, and oxides on the surface of the U-shaped outer frame to keep the surface of the U-shaped outer frame clean; Step S602: before performing nano injection molding, buffing the surface of the U-shaped outer frame to facilitate adhesion of the injection molding material to the surface; Step S603: Selecting polyurethane as the injection molding material according to the shape of the U-shaped outer frame; Step S604: uniformly filling the injection molding material onto the surface of the U-shaped outer frame by pressure injection; Step S605: After the injection molding is completed, the injection molding material on the surface of the U-shaped outer frame is cooled so that the injection molding material adheres to the U-shaped outer frame sufficiently; Step S606 includes checking the nano-injection molding effect on the surface of the U-shaped outer frame by checking whether there are any injection leaks, bubbles, or wrinkles in the injection molding material, and if there is any problem, repairing the material or injection molding again. [Effects of the Invention]

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] This invention reduces production costs by adopting a stamping method instead of the traditional CNC process using solid metal. The punching process involves hemming the aluminum plate to increase its thickness, improving the strength of the case components. The stepped screen mounting groove is machined to eliminate the face frame, reducing production costs and simplifying the assembly process. Anodizing the surface of the U-shaped outer frame allows the plastic to fully penetrate the surface of the aluminum case, increasing the degree of integration and preventing the plastic components from falling off the U-shaped frame. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a flowchart of a method for processing a face frameless case part according to an embodiment of the present invention. [Figure 2] 1 is a flowchart of cutting a plate material in an embodiment of the present invention. [Figure 3] 1 is a flowchart of punching and hemming of an aluminum plate material in an embodiment of the present invention. [Figure 4] 1 is a flowchart of CNC machining in an embodiment of the present invention. [Figure 5] 1 is a flowchart of polishing and cleaning a U-shaped frame in an embodiment of the present invention. [Figure 6] 1 is a flowchart of a surface T treatment for a U-shaped frame in an embodiment of the present invention. [Figure 7] 1 is a flow chart of nano injection molding in an embodiment of the present invention. [Figure 8] 1 is a structural schematic diagram of a case of a mobile terminal device in the prior art; [Figure 9] FIG. 2 is a structural schematic diagram of a U-shaped outer frame in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, but it is clear that the described embodiments are only a part of the embodiments of the present invention, and are not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

[0018] 1 to 7, the present invention provides a method for processing a face frameless case part, which includes the following steps S1 to S6.

[0019] S1: Cutting of plate material: The aluminum plate material is pre-cut into the basic shape for processing the face frameless case parts.

[0020] Specifically, the plate cutting in step S1 includes the following steps S101 to S104.

[0021] S101: Determine the cutting size and shape of the aluminum plate according to the design requirements of the mobile terminal device case.

[0022] S102: The aluminum plate is folded by a folding device to fold the aluminum plate into a desired shape.

[0023] S103: Use the aluminum sheet cutting tool to cut the aluminum sheet according to the design requirements.

[0024] S104: The aluminum plate is unfolded along the cutting direction and the edges of the aluminum plate are trimmed to achieve the designed gloss and surface quality.

[0025] Furthermore, when cutting the aluminum plate in step S103, the aluminum plate is cut from the front side, and the aluminum plate is cut out along the contour of the tool.

[0026] S2: Punching and hemming: The cut board is punched using a punching machine. During the punching process, the frame is thickened and an inward U-shaped frame is unwound.

[0027] Specifically, the punching and hemming of the aluminum plate material in step S2 includes the following steps S201 to S203.

[0028] S201: The cut aluminum plate is placed in the lower cavity of the punching machine, and the upper die of the punching machine is moved downward to punch and form the aluminum plate, stretching and thinning the aluminum plate and forming thick edges at the edges.

[0029] S202: After punching the aluminum plate into a U-shaped frame, two sets of push-type broaches in the punching machine are used to punch out both sides of the U-shaped frame, creating a hemmed portion at the top that is recessed inward.

[0030] S203: After punching, the U-shaped frame is pushed out from the lower cavity.

[0031] S3: CNC processing: Open an antenna slot on the surface of the U-shaped frame, and create a step structure for assembling the screen on the U-shaped frame.

[0032] Specifically, the CNC processing in step S3 includes the following steps S301 to S307.

[0033] S301: Milling and rough machining of adhesive receiving position: Using 3-axis CNC, the inner surface of the injection molded case part is machined, and the machined outer shape is used as the XY reference plane for subsequent processes, with an outer shape tolerance of +0.05~-0.03.

[0034] S302: Slot Milling: 3-axis CNC machining of front features of case parts before injection molding.

[0035] S303: Milling of the exterior and camera: The exterior and camera features of the case parts are finished using a 3-axis CNC.

[0036] S304: Milling of the relief portion of the internal cavity: The internal cavity of the case part is machined using a 3-axis CNC so that the flatness of the internal cavity of the case part after machining is 0.15.

[0037] S305: Milling of short side holes: The short side holes of the case parts are milled using a 4-axis CNC. During the milling process, a large flat magnetically impressed carbide press block is used to perform internal positioning on the case parts.

[0038] S306: Milling of long side holes: The long side holes of the case parts are machined using a 4-axis CNC. During machining, a large flat magnetically impressed carbide press block is used to perform internal positioning on the case parts.

[0039] S307: High gloss processing: The top and bottom of the case parts are chamfered using a 3-axis CNC to achieve a high gloss finish.

[0040] S4: Polishing and cleaning: Remove burrs and dirt on the surface of the U-shaped frame. Specifically, the polishing and cleaning of the U-shaped frame in step S4 includes the following steps S401 to S403.

[0041] S401: Surface Cleaning: Use a high pressure air gun to purge and clean the dust and foreign matter on the surface of the U-shaped frame.

[0042] S402: Applying detergent: Apply detergent to the areas of the surface of the U-shaped frame where burrs and dirt exist, specifically, a sodium hydroxide solution.

[0043] S403: Surface cleaning: After applying the cleaning agent, rinse with running water to clean the burrs and dirt on the surface of the U-shaped frame, and remove the cleaning agent residue and oil.

[0044] Furthermore, after cleaning the burrs and dirt on the surface of the U-shaped frame in step S4, the surface of the U-shaped frame is further washed with an alkaline cleaner to remove the oxide layer and paint remaining on the surface of the U-shaped frame.

[0045] S5: Surface T treatment: The surface of the U-shaped frame is subjected to an oxidation treatment to form minute pores on the surface of the U-shaped frame.

[0046] Specifically, the surface T treatment of the U-shaped frame in step S5 includes the following steps S501 to S504.

[0047] S501: In a vacuum high temperature environment, a reaction occurs at the interface between the oxide and aluminum on the surface of the U-shaped frame to produce aluminum oxide and zinc oxide.

[0048] S502: Under room temperature heating conditions, aluminum oxide and zinc oxide undergo a secondary reaction on the surface of the U-shaped frame, forming tiny pores.

[0049] S503: By controlling the oxidation process, the size and shape of the pores on the surface of the U-shaped frame are controlled.

[0050] S504: The U-shaped frame is electroplated to protect the micropores on its surface and prevent the aluminum oxide and zinc oxide from further reacting with aluminum and oxide.

[0051] Furthermore, controlling the oxidation process in step S503 includes:

[0052] The size and shape of the micropores can be controlled by changing the oxidation temperature; the lower the oxidation temperature, the smaller the pores, and the higher the oxidation temperature, the larger the pores. Therefore, the size of the micropores can be controlled by adjusting the oxidation temperature.

[0053] The size and shape of the micropores can be controlled by changing the oxidation time; the longer the oxidation time, the smaller the pores, and the shorter the oxidation time, the larger the pores. Therefore, the size of the micropores can be controlled by adjusting the oxidation time.

[0054] The size and shape of the micropores can be controlled by changing the oxidizing atmosphere. When oxidation is performed in normal air, large pores are formed, while when oxidation is performed under vacuum conditions, aluminum oxide is mainly produced and smaller pores are formed. Therefore, the size and shape of the micropores can be controlled by adjusting the oxidizing atmosphere.

[0055] Furthermore, the size and shape of the micropores can be controlled by changing the type of oxide. The type and content of the oxide in the micropores also affect the size and shape of the pores. For example, when oxidation is performed in air, the content of aluminum oxide increases, and larger pores are formed. On the other hand, when oxidation is performed under vacuum conditions, mainly aluminum oxide is produced, and smaller pores are formed. Therefore, the size and shape of the micropores can be controlled by adjusting the type and content of the oxide.

[0056] In some other embodiments, the U-shaped outer frame may be oxidized by a nano-molding based aluminum case anodization method, which specifically includes the following steps:

[0057] The aluminum case, which is processed by nano-molding technology and is in-mold injection molded, is foamed at a temperature of 90±2°C.

[0058] The foamed aluminum case is anodized at a voltage of 14 to 20 V for 16 to 24 minutes.

[0059] The anodized aluminum case is closed at a temperature of 85 to 100°C for 8 to 12 minutes.

[0060] In the method for anodizing an aluminum case based on the nano-molding process, the aluminum case is sandblasted before foaming, and the sandblasting is performed with a sandblasting device at a pressure of 19.61 to 23.54N.

[0061] In the anodizing method for an aluminum case based on the nano-molding process, the aluminum case after sandblasting is degreased by immersing it in a tank containing 6% to 12% neutral degreasing agent for 6 to 10 minutes.

[0062] In the anodizing method for the aluminum case based on the nano-molding process, the aluminum case is foamed, neutralized at room temperature for 8 to 12 seconds, and washed with deionized water.

[0063] In the nano-molding-based anodizing method for aluminum cases, compressed air is introduced into the deionized water during the deionized water washing process.

[0064] In the method for anodizing an aluminum case based on the nano-molding process, the aluminum case after the anodization and before pore closing is dyed at a temperature of 45 to 65° C. for 2.5 to 4.5 minutes.

[0065] In the above-mentioned anodizing method for an aluminum case based on nano-molding, the aluminum case is closed, washed with water, and air-dried at a temperature of 80 to 100° C. for 8 to 12 minutes.

[0066] In the anodizing method for an aluminum case based on the nano-molding process, sulfuric acid with a concentration of 98% is used for the foaming treatment, and the foaming time is 8 to 12 seconds.

[0067] In the method for anodizing an aluminum case based on the nano-molding process, the anodization of the aluminum case is carried out at a temperature of 16 to 24°C.

[0068] The nano-molding-based anodizing method for aluminum cases according to the above-mentioned embodiment innovatively improves the anodizing process for NMT aluminum cases, thereby ensuring the appearance of the surface of the aluminum case while significantly reducing the detrimental effects of the anodizing process on the bonding strength of the NMT aluminum case, allowing the surface-treated plastic structure and metal surface to maintain a practical bonding strength, thereby providing favorable conditions for the use and widespread use of NMT aluminum cases in smartphones.

[0069] S6: Nano injection molding: The antenna slot and other plastic parts are molded on the surface of the U-shaped frame by nano injection molding.

[0070] Nano injection molding on the surface of an aluminum product is a technology for fusing a material onto the aluminum surface, which can further improve the strength, hardness and wear resistance of the aluminum product. Specifically, the nano injection molding in step S6 specifically includes the following steps S601 to S606.

[0071] S601: Clean the surface of the U-shaped outer frame to remove foreign matter, oil stains, and oxides, and keep the surface of the U-shaped outer frame clean.

[0072] S602: Before nano injection molding, the surface of the U-shaped outer frame is buffed to facilitate adhesion of the injection molding material to the surface.

[0073] S603: According to the shape of the U-shaped outer frame, polyurethane is selected as the injection molding material.

[0074] S604: The injection molding material is uniformly filled onto the surface of the U-shaped outer frame by pressurized injection.

[0075] S605: After the injection molding is completed, the injection molding material on the surface of the U-shaped outer frame is cooled so that the injection molding material adheres sufficiently to the U-shaped outer frame.

[0076] S606: Check the nano-injection molding effect on the surface of the U-shaped outer frame by checking whether there is any injection leakage, air bubbles, or wrinkles in the injection molding material. If there is any problem, repair the material or inject it again.

[0077] Figure 9 shows a schematic diagram of the structure of a mobile terminal device case manufactured and processed according to the present invention after molding. By adopting a punching method instead of the traditional CNC machining of metal blocks, production costs can be reduced. The aluminum plate is hemmed and thickened during the punching process, improving the strength of the case components. The stepped screen mounting groove is carved out to eliminate the face frame, reducing production costs and simplifying the assembly process. Anodizing the surface of the U-shaped outer frame allows the plastic to fully penetrate the surface of the aluminum case, increasing the degree of integration and achieving a unified structure, thereby preventing the plastic components from falling off the U-shaped frame.

[0078] 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 variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for processing a face frameless case part, comprising: Plate cutting: Step S1: cutting an aluminum plate into a basic shape for processing a face frameless case part; Punching and hemming: punching the cut board material using a punching machine, and during the punching process, thickening the frame and unwinding the inward U-shaped frame. Step S2; CNC processing: Step S3: opening an antenna slot on the surface of the U-shaped frame and creating a step structure for assembling a screen on the U-shaped frame; Polishing and cleaning: step S4 to remove burrs and dirt on the surface of the U-shaped frame; Surface T treatment: Step S5 of oxidizing the surface of the U-shaped frame to form minute pores on the surface of the U-shaped frame; Nano injection molding: Step S6: molding the antenna slot and other plastic parts on the surface of the U-shaped frame by nano injection molding.

2. The cutting of the plate material in step S1 is performed as follows: Step S101: determining the cutting size and shape of an aluminum plate according to the design requirements of a case for a mobile terminal device; Step S102: folding the aluminum plate material into a desired shape using a folding device; Step S103: Using an aluminum plate cutting tool, cutting the aluminum plate according to design requirements; The method for processing a face frameless case part according to claim 1, further comprising step S104 of unfolding the aluminum plate along the cutting direction and trimming the edges of the aluminum plate to achieve the designed glossiness and surface quality.

3. 3. The method for processing a face-frameless case part according to claim 2, wherein when cutting the aluminum plate material in step S103, the aluminum plate material is cut from the front side and cut out along the contour of the tool.

4. The punching and hemming of the aluminum plate material in step S2 is performed as follows: Step S201: placing the cut aluminum plate in a lower cavity of a punching machine, moving an upper die of the punching machine downward to punch and shape the aluminum plate, stretching and thinning the aluminum plate, and forming thick side portions at the edges; Step S202: After punching the aluminum plate material into a U-shaped frame, two sets of push-type broaches in the punching machine are used to punch out both sides of the U-shaped frame, forming a hemmed portion at the top of the U-shaped frame; 4. The method for processing a face-frameless case part according to claim 3, further comprising: step S203 of pushing the U-shaped frame out of the lower cavity after stamping.

5. The CNC processing in step S3 is Milling and rough machining of the adhesive receiving position: Step S301: Using a 3-axis CNC, the injection molded inner surface of the case part is machined, and the machined outer surface is used as the XY reference surface for the subsequent process, with an outer surface tolerance of +0.05 to -0.03; Milling the slot: Step S302: Milling the front face features of the case part before injection molding with 3-axis CNC; Milling the contour and camera: Step S303: finishing the contour and camera features of the case parts with 3-axis CNC; Milling the recess of the internal cavity: Step S304: Milling the internal cavity of the case part using a 3-axis CNC so that the flatness of the internal cavity of the case part after machining is 0.15; Milling the short side holes: Milling the short side holes of the case part by 4-axis CNC, and during the milling, use a large flat magnetic carbide press block to perform internal positioning relative to the case part in step S305; Milling the long side holes: Milling the long side holes of the case part by 4-axis CNC, and during the milling, use a large flat magnetic carbide press block to perform internal positioning on the case part; step S306; The method for processing face frameless case parts as described in claim 4, characterized in that it includes step S307, which includes high gloss processing: C-chamfering the top and bottom of the case part using a 3-axis CNC to achieve high gloss.

6. The polishing and cleaning of the U-shaped frame in step S4 is performed as follows: Surface cleaning: Step S401: Using a high-pressure air gun to purge and clean the dust and foreign matter on the surface of the U-shaped frame; Applying a cleaning agent: applying a cleaning agent to the surface of the U-shaped frame where burrs and dirt are present, specifically, a sodium hydroxide solution, step S402; The method for processing a face frameless case part according to claim 5, further comprising: step S403 of surface cleaning, in which a detergent is applied and then washed away with running water to clean burrs and dirt from the surface of the U-shaped frame, and to remove detergent residue and oil.

7. 7. The method for processing a face frameless case part according to claim 6, wherein after the burrs and dirt on the surface of the U-shaped frame are cleaned in step S4, the surface of the U-shaped frame is further cleaned with an alkaline cleaner to remove the oxide layer and paint remaining on the surface of the U-shaped frame.

8. The surface T treatment of the U-shaped frame in step S5 is as follows: Step S501: In a vacuum high temperature environment, a reaction occurs at the interface between the oxide and aluminum and the oxide on the surface of the U-shaped frame to produce aluminum oxide and zinc oxide; Step S502: causing a secondary reaction between aluminum oxide and zinc oxide on the surface of the U-shaped frame under room temperature heating conditions to form minute pores; Step S503: controlling the oxidation process to control the size and shape of the pores on the surface of the U-shaped frame; The method for processing a face frameless case part as described in claim 7, further comprising step S504 of subjecting the U-shaped frame to an electroplating process to protect the micropores on its surface and prevent the aluminum oxide and zinc oxide from further reacting with the aluminum and oxide.

9. Controlling the oxidation process in step S503 includes: The size and shape of the micropores can be controlled by changing the oxidation temperature; the lower the oxidation temperature, the smaller the pores, and the higher the oxidation temperature, the larger the pores; The size and shape of the micropores can be controlled by changing the oxidation time; the longer the oxidation time, the smaller the pores, and the shorter the oxidation time, the larger the pores. The method for processing a face frameless case part according to claim 8, further comprising controlling the size and shape of the micropores by changing the oxidation atmosphere, so that when the oxidation treatment is performed in normal air, large pores are formed, and when the oxidation treatment is performed under vacuum conditions, aluminum oxide is mainly formed and small pores are formed.

10. Specifically, the nano injection molding in step S6 is performed as follows: Step S601: cleaning foreign matter, oil stains, and oxides on the surface of the U-shaped outer frame to keep the surface of the U-shaped outer frame clean; Step S602: before performing nano injection molding, buffing the surface of the U-shaped outer frame to facilitate adhesion of the injection molding material to the surface; Step S603: Selecting polyurethane as the injection molding material according to the shape of the U-shaped outer frame; Step S604: uniformly filling the injection molding material onto the surface of the U-shaped outer frame by pressure injection; Step S605: After the injection molding is completed, the injection molding material on the surface of the U-shaped outer frame is cooled so that the injection molding material adheres to the U-shaped outer frame sufficiently; The method for processing a face frameless case part as described in claim 9, further comprising: step S606 of checking the nano-injection molding effect on the surface of the U-shaped outer frame by checking whether there are any injection leaks, bubbles, or wrinkles in the injection molding material; and if there is any problem, repairing the material or re-injecting molding.

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