Method for processing face frameless shell materials

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 in particular to a processing method for face frameless case parts. [Background technology]

[0002] Aluminum materials are mainly used for the case of mobile terminal equipment, and the conventional case parts are generally cut out of an aluminum block into the required shape using CNC, and then add a face frame to assemble the screen based on this. As shown in Figure 8, Figure 8 is a schematic diagram of a case of a mobile terminal equipment in the prior art, and the aluminum block is cut out into the shape of a U-shaped face frame using CNC, and plastic face frames are attached to both sides of the upper part of the U-shaped face frame to attach the case to the surface of the mobile terminal equipment, which has the problem of high production costs. In addition, because the metal material shields the signal, it is necessary to open a slot and pull out the antenna by injection molding, and nano injection molding is usually used, but there is a problem that the injection molding parts are easy to fall off, so it is necessary to propose a processing method for face frameless case parts. 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 from 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: A punching machine is used to punch out the cut plate material. In the punching process, the frame is thickened and the inward U-shaped frame is unrolled in step S2; CNC processing: Step S3 of opening an antenna slot on the surface of the U-shaped frame and fabricating 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 of forming an 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 a cutting size and shape of an aluminum plate according to the design requirements of a case for a mobile terminal device; Step S102 of folding the aluminum plate material by a folding device to fold the aluminum plate material into a desired shape; Step S103 of cutting the aluminum plate according to design requirements using an aluminum plate cutting tool; 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 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: inserting the cut aluminum plate into 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 sides at the edges; Step S202: punching the aluminum plate into a U-shaped frame, and then punching both sides of the U-shaped frame with two sets of push-type broaches in the punching machine to form 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 includes: Milling and rough machining of adhesive receiving position: Step S301, using 3-axis CNC to machine the injection molded inner surface of the case part, and the machined outer shape is used as the XY reference plane for the subsequent process, with the outer shape tolerance being +0.05~-0.03; Milling the slot: Step S302, which uses 3-axis CNC to machine the front features of the case parts before injection molding; Milling the profile and camera: Step S303, where the profile and camera features of the case parts are finished by 3-axis CNC; Milling the relief of the internal cavity: Step S304 of machining the internal cavity of the case part by a three-axis CNC so that the flatness of the internal cavity of the case part after machining is 0.15; Milling short side holes: Milling the short side holes of the case parts by 4-axis CNC, and during the milling, a large flat magnetic carbide press block is used to perform internal positioning with respect to the case parts; Milling the long side hole: Milling the long side hole 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 with respect to the case part; High gloss processing: Step S307 includes 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 of purging and cleaning the dust and foreign matter on the surface of the U-shaped frame using a high-pressure air gun; 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 is used in 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 the 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: reacting at the interface between oxide and aluminum and oxide on the surface of the U-shaped frame in a vacuum high temperature environment 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 of controlling the size and shape of the pores on the surface of the U-shaped frame by controlling the oxidation process; Step S504 includes subjecting the U-shaped frame to an electroplating process to protect the microscopic pores 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 will be, and the higher the oxidation temperature, the larger the pores will be. The size and shape of the micropores can be controlled by changing the oxidation time. The longer the oxidation time, the smaller the pores will be, and the shorter the oxidation time, the larger the pores will be. The size and shape of the micropores are controlled by changing the oxidation atmosphere; 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.

[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 of buffing the surface of the U-shaped outer frame before performing nano injection molding 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 on the surface of the U-shaped outer frame by pressurized 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 sufficiently to the U-shaped outer frame; and step S606 of checking 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, and if there is any problem, repairing the material or re-injecting molding. Effect of the Invention

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

[0015] In the present invention, the punching method is adopted instead of the traditional CNC of the metal block, which can reduce the production cost. The aluminum plate is hemmed and thickened in the punching process, which can improve the strength of the case parts, and the stepped screen mounting groove is cut out to achieve face frameless, which can reduce the production cost and simplify the assembly process. The surface of the U-shaped outer frame is anodized, which allows the plastic to fully penetrate the surface of the aluminum case to increase the degree of fusion and realize integration, thereby avoiding the plastic parts from falling off the U-shaped frame. [Brief description of the drawings]

[0016] [Figure 1] 2 is a flowchart of a processing method for a face frameless case part in an embodiment of the present invention. [Diagram 2] 4 is a flowchart of cutting a plate material in an embodiment of the present invention. [Diagram 3] 1 is a flowchart of punching and hemming 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. [Diagram 5] 4 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 of 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] FIG. 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 PREFERRED EMBODIMENTS

[0017] Hereinafter, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, but it is clear that the described embodiments are only some 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 labor belong to the protection scope of the present invention.

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

[0019] S1: Sheet cutting: The aluminum sheet is pre-cut into the basic shape required 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 unrolled.

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

[0028] S201: The cut aluminum sheet is placed in the lower cavity of a punching machine, and the upper die of the punching machine is moved downward to punch and shape the aluminum sheet, stretching and thinning the aluminum sheet, and forming thick sides 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, and the top of the U-shaped frame is made into an inwardly recessed hemmed portion.

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

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

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

[0033] S301: Milling and rough machining of adhesive receiving position: Use 3-axis CNC to machine the injection molded inner surface of the case part, and use the machined outer shape as the XY reference plane for the subsequent process, 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: Profile and Camera Milling: Finish the profile and camera features of the case parts with 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 machined by 4-axis CNC, and a large flat magnetic carbide press block is used to perform internal positioning on the case parts during machining.

[0038] S306: Milling of long side holes: The long side holes of the case parts are machined by 4-axis CNC, and during machining, a large flat magnetic carbide press block is used to perform internal positioning relative to 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 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 a detergent to the part 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 oxidized 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 and oxide 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: The size and shape of the pores on the surface of the U-shaped frame are controlled by controlling the oxidation process.

[0050] S504: The U-shaped frame is electroplated to protect the microscopic pores 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 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 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 oxidizing in air, the content of aluminum oxide is high and larger pores are formed. On the other hand, when oxidizing 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 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 min.

[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 device performs sandblasting at a pressure of 19.61 to 23.54N.

[0061] In the above-mentioned anodizing method for an aluminum case based on nano-molding, 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 method for anodizing the aluminum case based on the nano-molding process, the aluminum case is foamed, neutralized at room temperature for 8 to 12 s, and washed with deionized water.

[0063] In the nano-molding based aluminum case anodization method, compressed air is introduced into the deionized water during the deionized water rinsing 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 method for anodizing an aluminum case based on nano-molding, the aluminum case is sealed, 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] In the above embodiment of the anodizing method for aluminum cases based on nano-molding, the anodizing process for NMT aluminum cases is innovatively improved, so that the appearance of the surface of the aluminum case is maintained while the detrimental effects of the anodizing process on the bonding strength of the NMT aluminum case are greatly reduced, and the surface-treated plastic structure and metal surface retain a practical bonding strength, thereby providing favorable conditions for the use and popularization 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 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 foreign matter, oil stains and oxides on the surface of the U-shaped outer frame, 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 the adhesion of the injection molding material to its surface.

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

[0074] S604: The injection molding material is evenly filled into 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 again.

[0077] As shown in FIG. 9, FIG. 9 is a schematic diagram of the structure of the case of a mobile terminal device produced and processed by the present invention after molding. By adopting the punching method instead of the traditional CNC of the metal block, the production cost can be reduced. By hemming and thickening the aluminum plate material in the punching process, the strength of the case parts can be improved, and by cutting out the step-shaped screen mounting groove, the face frameless can be achieved, the production cost can be reduced, and the assembly process can be simplified. By anodizing the surface of the U-shaped outer frame, the plastic can be fully infiltrated into the surface of the aluminum case to increase the degree of fusion and realize integration, thereby avoiding the plastic parts 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 machining a face frameless case part, comprising the steps of: 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: punching the cut plate material using a punching machine, and in the punching process, thickening the frame and unrolling the inward U-shaped frame in step S2; CNC processing: Step S3: opening an antenna slot on the surface of the U-shaped frame and fabricating 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: forming antenna slots and other plastic parts on the surface of the U-shaped frame by nano injection molding (S6).

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

3. 3. The method for machining a face frameless case part according to claim 2, wherein when cutting the aluminum plate in step S103, the aluminum plate 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: inserting the cut aluminum plate into 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 sides at the edges; Step S202: punching the aluminum plate material into a U-shaped frame, and then punching both sides of the U-shaped frame with two sets of push-type broaches in the punching machine to form 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: (S203) pushing the U-shaped frame out of the lower cavity after punching.

5. The CNC processing in step S3 is Milling and rough machining of the adhesive receiving position: A 3-axis CNC is used to machine the injection molded inner surface of the case part, and the machined outer shape is used as the XY reference plane for the subsequent process, with the outer shape tolerance being +0.05 to -0.03 in step S301; Milling the slot: Step S302: machining the front features of the case part before injection molding with 3-axis CNC; Milling the contour and camera: Finishing the contour and camera features of the case parts with 3-axis CNC S303; Milling the relief of the internal cavity: Step S304 of machining the internal cavity of the case part by a three-axis CNC so that the flatness of the internal cavity of the case part after machining is 0.15; Milling short side holes: Milling the short side holes of the case part with 4-axis CNC, and using a large flat magnetic carbide press block to perform internal positioning with respect to the case part during milling (S305); Milling the long side holes: Milling the long side holes of the case parts by 4-axis CNC, and using a large flat magnetic carbide press block to perform internal positioning with respect to the case parts during milling (S306); The method for processing a face frameless case part as described in claim 4, characterized in that it includes a step S307 of high gloss processing: performing C chamfering on the upper and lower parts 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 is used in step S402; The processing method for a face frameless case part according to claim 5, further comprising: a step S403 of surface cleaning, in which a cleaning agent is applied and then washed away with running water to clean burrs and dirt on the surface of the U-shaped frame, and to remove any residual cleaning agent and oil.

7. The processing method for a face frameless case part according to claim 6, characterized in that 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 washed 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: reacting at the interface between oxide and aluminum and oxide on the surface of the U-shaped frame in a vacuum high temperature environment 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 micropores; 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 microscopic pores 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 will be, and the higher the oxidation temperature, the larger the pores will be. The size and shape of the micropores can be controlled by changing the oxidation time. The longer the oxidation time, the smaller the pores will be, and the shorter the oxidation time, the larger the pores will be. The processing method for a face frameless case part according to claim 8, further comprising: controlling the size and shape of the minute pores by changing the oxidation atmosphere; 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 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: prior to 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 on 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 processing method for a face frameless case part as described in claim 9, further comprising: checking 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; and if there is any problem, repairing the material or injection molding again (S606).

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