CN111278244A

CN111278244A - Shell, preparation method and electronic equipment

Info

Publication number: CN111278244A
Application number: CN202010140278.4A
Authority: CN
Inventors: 杨鑫
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2020-06-12

Abstract

The application discloses a shell, a preparation method and electronic equipment. The method comprises the following steps: providing a shell blank comprising carbon fibers and a resin; performing multi-line cutting on the shell blank to form a plurality of shell rough blanks; and carrying out reshaping and flattening on the shell rough blank, and carrying out post-treatment to obtain the shell. Therefore, the method can realize the full utilization of the shell blank, improve the utilization rate of the forging carbon and reduce the cost of the shell.

Description

Shell, preparation method and electronic equipment

Technical Field

The application relates to the technical field of electronic equipment, in particular to a shell, a preparation method and electronic equipment.

Background

The forged carbon is a carbon fiber-based composite material, and can be used for preparing appearance parts of electronic equipment due to excellent appearance effect and texture. Forged carbon can present different textures under different angles for electronic equipment outward appearance piece has multiple outward appearance effect, thereby can promote electronic equipment outward appearance piece visual variety and aesthetic property. And the density of the wrought carbon is relatively low (1.6 g/cm)³) The overall weight of the electronic device can be greatly reduced.

However, the housing made of forged carbon, the manufacturing method thereof, and the electronic device still need to be improved.

Disclosure of Invention

The present application is based on the discovery and recognition by the inventors of the following facts and problems:

currently, shells made from forged carbon have the problem of higher cost. The inventors have found that the cost of forging carbon shells is high due to two reasons: on one hand, the material cost of the forged carbon is high, and on the other hand, the utilization rate of the forged carbon is low in the process of preparing the shell, so that the cost of forging the carbon shell is further increased. Specifically, in order to ensure that the forged carbon shell presents reflection textures at different angles, the shell blank needs to be prepared to be thick (about 3-20mm) in the preparation process, so that the carbon fibers can be distributed at different angles, the shell presents reflection textures at different angles, and the thickness of the shell is usually about 0.5mm, therefore, the shell blank needs to be subjected to numerical control machining (CNC) to thin the shell blank.

The present application aims to mitigate or solve at least to some extent at least one of the above mentioned problems.

In one aspect of the present application, a method of making a housing is presented. The method comprises the following steps: providing a shell blank comprising carbon fibers and a resin; performing multi-line cutting on the shell blank to form a plurality of shell rough blanks; and carrying out reshaping and flattening on the shell rough blank, and carrying out post-treatment to obtain the shell. Therefore, the method can realize the full utilization of the shell blank, improve the utilization rate of the forging carbon and reduce the cost of the shell.

In another aspect of the present application, a housing is presented. The housing includes: the shell is formed by forged carbon, the forged carbon comprises carbon fibers and resin, and the shell is provided with textures. Therefore, the shell has lower cost, different reflecting textures can be presented on the shell at different angles, various appearance effects are presented, and the diversity and the attractiveness of the appearance of the shell are improved.

In another aspect of the present application, a housing is presented. The shell is prepared using the method described previously. The housing thus has all the features and advantages of the housing prepared by the method described above, which will not be described in detail here. Generally speaking, this casing has lower cost, and this casing can present different reflection of light textures under different angles, presents multiple outward appearance effect, promotes the variety and the aesthetic property of casing outward appearance.

In another aspect of the present application, an electronic device is presented. The electronic device includes: the shell is the shell described above; mainboard and display screen, the mainboard with the display screen is located one side of casing, the mainboard is close to the casing sets up, just the light-emitting side of display screen is kept away from the casing sets up. Thus, the electronic device has all the features and advantages of the housing described above, which are not described in detail herein. Generally speaking, the electronic equipment has lower cost, and the electronic equipment can present different reflection of light textures under different angles, presents multiple appearance effect, promotes the variety and the aesthetic property of electronic equipment outward appearance.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the examples taken in conjunction with the accompanying drawings, in which:

FIG. 1 shows a schematic flow diagram of a method of preparing a housing according to one example of the present application;

FIG. 2 shows a schematic structural view of a shell blank according to one example of the present application;

FIG. 3 shows a schematic structural view of a shell blank according to one example of the present application;

FIG. 4 shows a schematic structural view of a housing according to an example of the present application;

fig. 5 shows a schematic structural diagram of an electronic device according to an example of the application.

Description of reference numerals:

100: a housing blank; 200: rough shell blanks; 300: a housing; 310: a main body; 320: a side wall.

Detailed Description

Reference will now be made in detail to examples of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The examples described below with reference to the drawings are illustrative only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In one aspect of the present application, a method of making a housing is presented. In some examples of the present application, with reference to fig. 1, the method includes:

s100: providing a shell blank comprising carbon fibers and a resin

In this step, a shell blank is provided, which comprises carbon fibers and a resin, i.e. which is a forged carbon material. It should be noted that "carbon preform" refers to a carbon fiber-based composite material formed by pressing carbon fibers and other components (e.g., resin), and the carbon preform may exhibit different textures at different angles.

In some examples of the present application, the shell blank may be prepared by:

first, a plurality of materials for forming a case blank are mechanically stirred and uniformly mixed to obtain a raw material.

In some examples of the present application, the raw material may include carbon fibers and a resin.

In other examples of the present application, the raw material may further include glass fibers, and the content of the carbon fibers may be 30 to 80%, such as 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, and the content of the glass fibers may be 5 to 40%, such as 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, and the content of the resin may be 20 to 50%, such as 20%, 25%, 30%, 35%, 40%, 45%, 50%, based on the total mass of the raw material, wherein the length of the carbon fibers may be 1 to 10cm, such as 1cm, 2cm, 3cm, 4cm, 5cm, 6cm, 7cm, 8cm, 9cm, and 10 cm. From this, can make the casing that finally obtains present different textures under different angles for the casing has multiple outward appearance effect, promotes the variety and the aesthetic property of casing outward appearance, and glass fiber can provide the colour effect for the casing, further richens the outward appearance of casing.

In some examples of the present application, the resin may be a thermosetting resin, or a thermoplastic resin, for example, a thermosetting epoxy resin, or a thermoplastic Polycarbonate (PC). Thus, the strength and reliability of the housing can be improved.

Subsequently, the above raw materials are placed in a die and pressed to form a shell blank. In some examples of the present application, the temperature of the pressing may be 150-. Thereby, a forged carbon may be formed to obtain a shell blank.

In some examples of the present application, the press formed housing blank 100 is a planar structure (see fig. 2) and the thickness of the housing blank (H as shown in fig. 2) is 10-50mm, such as 10mm, 20mm, 30mm, 40mm, 50 mm. The inventor finds that if the thickness of the shell blank is too small, the carbon fibers cannot be distributed at different angles, so that the appearance effect of the shell is affected, and if the thickness of the shell blank is too large, defects are formed inside the shell blank in the pressing process, so that the product yield is affected. This application is with the thickness control of casing blank in above-mentioned within range, can make the carbon fiber be different angular distributions for the casing obtains multiple outward appearance effect, guarantees simultaneously that the casing blank has higher quality and higher yield. In some specific examples of the present application, the thickness of the shell blank may be 20-50 mm.

The cross-sectional shape and size of the shell blank are not particularly limited, and those skilled in the art can design the cross-sectional shape and size according to the requirements of actual products. For example, the cross-sectional shape of the housing blank may be rectangular (refer to fig. 2), and the length and width of the housing blank may be designed according to the size of an actual product. Note that the "cross section" means a cross section taken in a direction perpendicular to the thickness direction of the case blank.

It should be noted that the shell blank is formed in the pressing die, and therefore, the shape and size of the accommodating cavity in the pressing die are consistent with those of the shell blank, i.e. the depth of the accommodating cavity in the pressing die is 10-50 mm. Thereby, it is possible to ensure sufficient anisotropy of the carbon fibers in the thickness direction, that is, the shell blank obtained in this step can have a textured appearance effect in the thickness direction, thereby ensuring the texture diversity of the shell finally obtained.

S200: performing multi-line cutting on the shell blank to form a plurality of shell rough blanks

In this step, the shell blank is subjected to multi-wire cutting to form a plurality of shell blanks. That is, along the direction of perpendicular to casing blank thickness, cut the casing blank, cut into a plurality of casing rough blanks 200 (refer to fig. 3) with the casing blank, follow-up respectively carries out the integer flattening and aftertreatment to a plurality of casing rough blanks to form a plurality of casings, carry out make full use of to the casing blank, reduce the waste of forging carbon, show the utilization ratio that improves forging carbon, reduce the cost of casing.

As described above, since the shell blank formed in the foregoing step has a sufficient thickness and the carbon fibers in the shell blank have anisotropy in the thickness direction, that is, have different angular distributions, the plurality of shell blanks formed by performing the multi-wire cutting on the shell blank also have anisotropy in the thickness direction. That is, even if the thickness of the shell rough blank obtained by multi-line cutting is small, the shell rough blank can still present different light reflecting textures at different angles in the thickness direction, so that the finally formed shell presents multiple appearance effects. Namely, the shell rough blank obtained in the step can be used for forming the shell no matter the thickness is thick or thin, so that the shell blank can be fully utilized, the utilization rate of the forging carbon is improved, and the cost of the shell is reduced.

In some examples of the application, the shell blank is fixed on a multi-wire cutting machine table by glue to perform multi-wire cutting, the multi-wire cutting can adopt a steel wire with the diameter of 0.1-0.3mm, the wire routing speed of the steel wire can be 800-1200m/min such as 800m/min, 900m/min, 1000m/min, 1100m/min and 1200m/min during the multi-wire cutting, the feeding speed of the multi-wire cutting can be 0.1-5mm/min such as 0.1mm/min, 0.5mm/min, 1mm/min, 1.5mm/min, 2mm/min, 2.5mm/min, 3mm/min, 3.5mm/min, 4mm/min, 4.5mm/min and 5mm/min, the swing angle of the multi-wire cutting can be 5-10 degrees such as 5 degrees, 8 degrees and 10 degrees, and the multi-wire cutting time can be 0.5-4h, such as 0.5h, 1h, 2h, 3h and 4 h. Therefore, a plurality of shell rough blanks with high quality and yield can be obtained.

The inventors have found that if the cutting speed (the running speed and the feeding speed) is too low, the cutting efficiency is low, and if the cutting speed is too high, defects such as skew and uneven cutting are likely to occur, and that if the cutting speed is too high, heat is generated, and the case material is likely to be deformed or even cracked. This application sets up cutting speed in above-mentioned within range, can make the cutting process have higher efficiency, is favorable to improving the quality and the yield of casing rough blank simultaneously. The swing angle is arranged in the range, so that the stability of the cutting process can be ensured, and the defects of material shortage or deformation and the like of the shell rough blank are relieved. Regarding the time of cutting, since the cutting is performed in a direction perpendicular to the thickness of the case blank, the specific time of cutting may be determined according to the feeding speed and the length or width of the case blank.

In some examples of the present application, the difference in thickness of the plurality of shell blanks cut to form is no more than 0.05 mm. Specifically, any two of the plurality of shell blanks are formed with a thickness difference of no more than 0.05 mm. Thus, a plurality of shell blanks having a uniform thickness can be formed.

In some examples of the present application, each shell blank formed may have a thickness (D as shown in fig. 3) of 0.5-1mm, such as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1 mm. Therefore, the shell rough blank has a thinner thickness, and the shell with the thinner thickness can be obtained after subsequent shaping, trimming and post-treatment. It should be noted that the thickness of each shell blank can be controlled by adjusting the distance between two adjacent steel wires.

S300: the rough blank of the shell is trimmed and post-processed to obtain the shell

In this step, the shell blank is trimmed and post-processed to obtain the shell. In some examples of the present application, the finishing smoothing may include hot press smoothing or mechanical abrasive smoothing. Therefore, the shell rough blank can be trimmed in the two modes, the thickness of the shell rough blank is uniform, and the integral uniformity of the shell rough blank is improved.

In some examples of the present application, the hot press leveling may be performed by placing the housing blank in a fixture, specifically, placing the housing blank in a fixture, and keeping the temperature at 80-120 ℃ for 0.5-2 h. From this, can utilize the dead weight of anchor clamps to play the effect of flattening to the casing rough blank to the realization is flattened the integer of casing rough blank, makes casing rough blank thickness even, improves the holistic homogeneity of casing rough blank. In some specific examples of the present application, the temperature of the hot press leveling may be 80 ℃, 90 ℃, 100 ℃, 110 ℃, 120 ℃, and the holding time of the hot press leveling may be 0.5h, 0.8h, 1h, 1.2h, 1.5h, 1.8h, 2 h.

It should be noted that, the clamp used for hot pressing and leveling needs to have a certain self weight to perform the leveling function in the leveling and leveling process, and the surface needs to be smooth and flat. The specific material for the thermocompression smoothing jig is not particularly limited, and for example, the jig may be made of stainless steel 304.

In some examples of the present application, the mechanical grinding and flattening may be performed by placing the shell blank in a double-sided grinder, specifically, placing the shell blank in a double-sided grinder, and performing double-sided grinding by means of mechanical grinding, wherein the pressure of the mechanical grinding may be 50-300Kg · f/cm²E.g. 50 Kg. f/cm²、100Kg·f/cm²、150Kg·f/cm²、200Kg·f/cm²、250Kg·f/cm²、300Kg·f/cm²The rotation speed of the grinding disc for mechanical grinding can be 5-30rpm, such as 5rpm, 10rpm, 15rpm, 20rpm, 25rpm, 30rpm, and the single-side grinding for mechanical grinding can be addedThe work amount can be 0.03-0.1mm, such as 0.03mm, 0.05mm, 0.08mm, 0.1 mm. Therefore, the thickness of the shell rough blank is uniform, and the integral uniformity of the shell rough blank is improved. The amount of single-side polishing can be controlled by the polishing pressure, the polishing rotational speed, and the polishing time.

In some examples of the present application, the abrasive disk used in the mechanical lapping and flattening process may include an iron disk, a copper disk, or a resin disk, and the abrasive used in the mechanical lapping and flattening process may include at least one of silicon carbide, boron carbide, and diamond liquid. Thus, good grinding and flattening of the shell blank can be achieved.

In some examples of the present application, the flatness of the trimmed shell blank does not exceed 0.1 mm. Therefore, the shell rough blank after the shaping and flattening has smaller flatness, namely the shell rough blank has uniform thickness and higher uniformity.

In some examples of the application, after the truing, the shell blank is post-processed, which may include numerical control machining (CNC machining) and polishing. Specifically, the CNC machining is performed on the periphery of the trimmed and flattened shell rough blank and an area (such as an area for arranging a camera and other structures) where holes need to be formed, the CNC machining time can be 5-20 min/piece, the rotating speed of a spindle of the CNC machining can be 40000-50000rpm, and a tool of the CNC machining can be an alloy tool. Therefore, the periphery of the shell rough blank and the holes can be machined. The polishing may include rough grinding and finishing, in which the housing rough blank after CNC processing is firstly roughly ground, the mesh number of the sand paper used for rough grinding may be 400-4000 mesh, and then the housing rough blank after rough grinding is finished, the mesh number of the sand paper used for finishing may be 2000-4000 mesh. Therefore, the surface of the shell obtained after polishing is smooth and fine, and the texture is clear and visible.

In some examples of the present application, the shell blank obtained in S100 is a planar structure, and therefore, the plurality of shell blanks obtained after cutting in S200 are also a planar structure, and the shell blank having the planar structure is subjected to trimming and post-processing, so that a shell having a planar structure can be obtained, or a shell having a curved structure can also be obtained.

In some examples of the present application, referring to fig. 4, the housing 300 having a curved structure may include a main body 310 and a plurality of sidewalls 320 connected to the main body 310, wherein a bending angle (a shown in fig. 4) between the sidewalls 320 and a plane in which the main body 310 is located is not greater than 90 degrees.

It should be noted that the term "bending angle" in this application refers to the angle between the side wall and the main body (α as shown in fig. 4), specifically, the angle between the side wall and the plane of the main body, in some examples of this application, the main body of the housing may be a plane, or may also be an arc surface, when the main body includes a plane structure and an arc surface structure, the plane of the main body is the plane of the plane structure, when the main body is an arc surface as a whole, the plane of the main body is the plane of the tangent line at the highest point of the protrusion of the main body, the side wall may also be a plane or an arc surface, when the outer surface of the side wall is an arc surface, the maximum value of the angle between the tangent line at any point on the outer surface of the side wall and the plane of the main body is the bending angle at the side wall (α as shown in fig..

In some examples of the present application, the side wall with a large bending angle may be formed in a hot pressing and flattening process, specifically, a housing blank with a planar structure is placed in a fixture with a receiving cavity, and the shape of the receiving cavity is the shape of the housing to be formed. The self weight of the clamp is utilized, and the temperature is kept for 0.5 to 2 hours at the temperature of between 80 and 120 ℃. Therefore, the side wall with the larger bending angle can be formed by hot-pressing the whole rough shell, so that the rough shell can be flattened in the hot-pressing flattening process, and the side wall with the larger bending angle can be formed. In the case of manufacturing the housing having the above structure, the thermoplastic resin is used as the resin in the raw material, which facilitates the formation of the sidewall having a large bending angle in the hot pressing process. The specific weight of the fixture and the specific time of hot pressing during the hot pressing leveling process are not particularly limited as long as the sidewall with a larger bending angle can be formed, and those skilled in the art can design the weight of the fixture and the hot pressing time according to actual needs.

In some examples of the present application, the sidewall with a smaller bending angle may be formed by CNC machining, specifically, the trimmed and flattened shell blank is a planar structure, the edge of the shell blank with the planar structure is CNC machined, and the redundant portion is removed to form the sidewall with a smaller bending angle.

In some examples of the present application, the bending angle at the side wall may be less than 90 degrees. Therefore, the side wall can be prevented from being buckled inwards, and the overall strength and the light reflecting texture of the shell can not be influenced.

In summary, by preparing a shell blank with a thicker thickness (10-50mm), performing multi-line cutting on the shell blank in a direction perpendicular to the thickness of the shell blank to form a plurality of shell rough blanks, then performing shape-flattening on the shell rough blanks to improve the uniformity of the shell rough blanks, and finally performing post-treatment on the shell rough blanks to obtain the shell, the method can fully utilize the forged carbon shell blank, improve the utilization rate of forged carbon, and reduce the cost of the shell, compared with the prior art, the cost of the shell prepared by the method can be reduced by about 30%, so that the forged carbon can be applied to the shell in large batch, the shell presents different reflective textures at different angles, presents various appearance effects, and the diversity and the attractiveness of the appearance of the shell are improved.

In another aspect of the present application, a housing is presented. In some examples of the present application, referring to fig. 4, the housing comprises: a main body 310 and a plurality of sidewalls 320 connected to the main body 310, a bending angle between the sidewalls 320 and a plane in which the main body 310 is positioned is not more than 90 degrees, the shell is formed of forged carbon including carbon fibers and resin, and the shell has texture. Therefore, the shell can present different reflective textures at different angles, can present various appearance effects, and improves the diversity and the attractiveness of the appearance of the shell.

In some examples of the present application, the housing may be prepared by the methods described above. Thus, the housing has a lower cost. The bending angle has been described in detail above, and is not described in detail here.

In another aspect of the present application, a housing is presented. In some examples of the present application, the housing is prepared by the method described above. The housing thus has all the features and advantages of the housing prepared by the method described above, which will not be described in detail here. Generally speaking, this casing has lower cost, and this casing can present different reflection of light textures under different angles, can present multiple outward appearance effect, promotes the variety and the aesthetic property of casing outward appearance.

In another aspect of the present application, an electronic device is presented. In some examples of the present application, with reference to fig. 5, the electronic device includes: casing 1000, mainboard and display screen, casing 1000 are the casing of preceding description, and mainboard and display screen are located one side of casing 1000, and the mainboard is close to casing 1000 and sets up, and casing 1000 setting is kept away from to the light-emitting side of display screen. Thus, the electronic device has all the features and advantages of the housing described above, which are not described in detail herein. Generally speaking, the electronic equipment has lower cost, can present different reflection textures at different angles, can present various appearance effects, and improves the diversity and the aesthetic property of appearance.

In some examples of the application, the electronic device may be any of various types of computer system devices that are mobile or portable and perform wireless communications. In particular, the electronic device may be a mobile or smart phone, a portable gaming device, a laptop computer, a personal digital assistant, a portable internet appliance, a music player, and a data storage device, other handheld devices, and devices such as a watch. Therefore, the electronic equipment has lower cost, can present different reflective textures at different angles, can present various appearance effects, and improves the diversity and the attractiveness of the appearance.

Example 1

(1) Preparing raw materials: 5 wt% of glass fiber, 60% of carbon fiber and 35% of resin are uniformly mixed by adopting a mechanical stirring mode to prepare the raw material.

(2) Preparing a shell blank: the size of the shell blank is 150mm multiplied by 70mm multiplied by 40mm, and a pressing die is designed and manufactured according to the size of the shell blank. Putting the raw materials into a die, heating the die to 160 ℃, setting the pressure to 80MPa, and keeping the temperature for 30min to prepare a shell blank of 150mm multiplied by 70mm multiplied by 40 mm.

(3) Multi-line cutting: the shell blank is fixedly arranged on a multi-wire cutting machine table by glue, a steel wire with the diameter of 0.15mm is adopted, the wire routing speed of the steel wire is 900m/min, the cutting feed speed is 0.5mm/min, the swing angle is 5 degrees, the cutting time of the shell blank is 2 hours, and the thickness of each shell blank obtained after cutting is about 0.7 mm.

(4) Shaping and flattening: placing the shell rough blank flat sheet in a 13.6B double-sided grinder, wherein the grinding disc is an iron disc, the grinding material is silicon carbide, and the pressure is 100 Kg.f/cm²The rotation speed was 15rpm, and the polishing amount on one side was 0.10 mm.

(5) CNC machining: and carrying out CNC machining on the periphery of the shell rough blank subjected to the shaping and flattening and an area needing to be provided with holes, wherein the CNC machining time is 10 min/piece, the adopted cutter is an alloy cutter, and the rotating speed of a main shaft of a machine table is 40000 rpm.

(6) Polishing: and (3) grinding and polishing the shell rough blank after CNC machining by using sand paper, performing rough grinding by using 600 meshes, and then performing fine finishing by using 2000 meshes to obtain the shell with a planar structure.

The method of example 1 can obtain a plurality of shells, the shell blanks are fully utilized, the utilization rate of forging carbon is improved, the cost of the shells is reduced, and each obtained shell can present different reflective textures at different angles and present various appearance effects.

In the description of the present application, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present application but do not require that the present application must be constructed and operated in a specific orientation, and thus, cannot be construed as limiting the present application.

Various examples and features of different examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A method of making a housing, comprising:

providing a shell blank comprising carbon fibers and a resin;

performing multi-line cutting on the shell blank to form a plurality of shell rough blanks;

and carrying out reshaping and flattening on the shell rough blank, and carrying out post-treatment to obtain the shell.

2. The method of claim 1, wherein the shell blank is a planar structure and the shell blank has a thickness of 10-50 mm.

3. The method of claim 1, wherein the shell blank further comprises glass fibers, the carbon fibers being present in an amount of 30-80%, the glass fibers being present in an amount of 5-40%, and the resin being present in an amount of 20-50%, based on the total mass of the shell blank;

optionally, the shell blank is formed by placing raw materials for forming the shell blank in a die for pressing, wherein the pressing temperature is 150-200 ℃, the pressing pressure is 50-100MPa, and the pressing heat preservation time is 30-60 min.

4. The method as claimed in claim 1, wherein the multi-line cutting employs a steel wire with a diameter of 0.1-0.3mm, the wire running speed of the steel wire during the multi-line cutting is 800-1200m/min, the feeding speed of the multi-line cutting is 0.1-5mm/min, the swing angle of the multi-line cutting is 5-10 degrees, and the time of the multi-line cutting is 0.5-4 h.

5. The method of claim 1, wherein the thickness of the plurality of shell blanks differ by no more than 0.05 mm.

6. The method of claim 1, wherein each of the shell blanks has a thickness of 0.5-1 mm.

7. The method of claim 1, wherein the finishing smoothing comprises hot press smoothing or mechanical abrasive smoothing.

8. The method according to claim 7, wherein the hot pressing and flattening is carried out by placing the shell rough blank in a clamp, the temperature of the hot pressing and flattening is 80-120 ℃, and the holding time of the hot pressing and flattening is 0.5-2 h.

9. The method of claim 7, wherein the mechanical grinding smoothing is performed by placing the shell blank in a double-sided grinder at a pressure of 50-300 Kg-f/cm²The rotating speed of the grinding disc for mechanical grinding and flattening is 5-30rpm, and the single-side grinding processing amount for mechanical grinding and flattening is 0.03-0.1 mm.

10. The method of claim 9, wherein the abrasive disc comprises an iron disc, a copper disc, or a resin disc;

optionally, the abrasive used for mechanical lapping comprises at least one of silicon carbide, boron carbide and diamond liquid.

11. The method of claim 1, wherein the flatness of the case blank after the truing is no more than 0.1 mm.

12. The method of claim 1, wherein the post-processing comprises numerical control machining and polishing.

13. The method as claimed in claim 12, wherein the time of the numerical control machining is 5-20 min/piece, and the spindle speed of the numerical control machining is 40000 and 50000 rpm.

14. The method as claimed in claim 12, wherein the polishing comprises rough grinding and finishing, the sand paper used for rough grinding has a mesh size of 400-.

15. The method of claim 8, wherein the housing comprises a main body and a plurality of side walls connected to the main body, and the bending angle between the side walls and the plane of the main body is not more than 90 degrees.

16. The method of claim 15, wherein the side walls of the housing are formed by the hot press smoothing or are formed by numerical control machining.

17. A housing, comprising:

the shell is formed by forged carbon, the forged carbon comprises carbon fibers and resin, and the shell is provided with textures.

18. A housing prepared by the method of any one of claims 1 to 16.

19. An electronic device, comprising:

a housing according to claim 17 or 18;

mainboard and display screen, the mainboard with the display screen is located one side of casing, the mainboard is close to the casing sets up, just the light-emitting side of display screen is kept away from the casing sets up.