1. A method for manufacturing a metal shell is characterized by comprising the following steps:

stamping a first area and a second area of a metal plate material to form two first bulges on the metal plate material, wherein the first area and the second area are respectively provided with a through part penetrating through the metal plate material, and the first area and the second area are positioned on the same side of the metal plate material;

extruding the first bulge to enable the thickness of the first bulge to accord with a first parameter standard value;

milling the first bulge which meets the standard value of the first parameter to form a second bulge, wherein the height of the second bulge meets the standard value of the second parameter;

stamping the periphery of the metal plate except the first area and the second area to form a first folded edge on the periphery;

extruding the first folded edge to enable the thickness of the first folded edge to meet the first parameter standard value;

milling the first folded edge which meets the standard value of the first parameter to form a second folded edge, wherein the height of the second folded edge meets the standard value of the second parameter;

processing the surface of the periphery of the inner side surface of the metal plate to form a micro-hole;

arranging a mold on the metal plate, wherein an injection molding opening is formed between the mold and the second folded edge;

inserting a plurality of injection molding pieces into the injection molding opening;

performing nano injection molding on the periphery of the inner side surface of the metal plate to form a plastic part between the metal plate and the mold, wherein the plastic part is meshed with the metal plate;

removing the mould;

the metal plate is subjected to a finishing treatment to form the metal shell.

2. The method of claim 1, wherein said step of stamping a first region and a second region of a sheet metal material to form two first projections in said sheet metal material, said first region and said second region each forming a through-penetration through said sheet metal material, said first region and said second region being located on the same side of said sheet metal material comprises:

performing first stamping on the first area and the second area, so that an included angle between stamped metal surfaces on the first area and the second area and a surface perpendicular to the metal plate is a first acute angle;

performing second stamping on the first area and the second area, so that an included angle between the stamped metal surfaces on the first area and the second area and a surface perpendicular to the metal plate is a right angle;

and hollowing out the punched metal on the first area and the second area to form two first bulges on the metal plate, wherein the first area and the second area respectively form a through part penetrating through the metal plate, and the first area and the second area are positioned on the same side of the metal plate.

3. The method of claim 1, wherein said step of stamping the perimeter of said metal sheet material excluding said first region and said second region to form a first fold in said perimeter comprises:

performing third stamping on the periphery to enable an included angle between the stamped metal surface on the periphery and a surface perpendicular to the metal plate to be a second acute angle;

and fourthly, punching the periphery to enable an included angle between the punched metal surface of the periphery and a surface perpendicular to the metal plate to be a right angle, so that the first folded edge is formed on the periphery.

4. The method of claim 1, wherein the metal plate material includes a first edge and a second edge disposed opposite the first edge, both of the through portions being located at the first edge;

after the step of milling the first folded edge meeting the first parametric standard value to form a second folded edge, wherein the height of the second folded edge meets the second parametric standard value, the method further comprises:

performing bending treatment on the second folded edge of the first edge so that an included angle between the second folded edge of the first edge and a surface perpendicular to the metal plate is a third acute angle;

and performing corner bending treatment on the second folded edge of the second edge so as to enable an included angle between the second folded edge of the second edge and a surface perpendicular to the metal plate to be a fourth acute angle.

5. The method of claim 1, wherein the cross-sectional area of the injection port decreases in a direction toward the mold.

6. The method of claim 5, wherein the end of the second flange has a first step portion forming an opening between the first step portion and the mold, the second flange having a groove formed in an inner side thereof, the groove extending along a length of the second flange, the groove being configured to engage the plastic member with the second flange.

7. The method of claim 6, wherein the die is provided with a plurality of abutments, and wherein the plurality of abutments each abut an inner side surface of the metal sheet when the die is disposed on the metal sheet.

8. The method of claim 7, wherein the injection molding part comprises a first conducting part, a second conducting part and an injection molding head which are communicated in sequence, the first conducting part is communicated with the injection molding equipment, the injection molding head is matched with the injection molding opening, and a fifth acute angle is formed between the second conducting part and the injection molding head.

9. The method of claim 8, wherein an end of the injection head distal from the second lead-through has a length in a range of 7.5mm to 8mm and a width in a range of 0.75mm to 0.85 mm.

10. The method of claim 1, wherein after the step of removing the mold, the method further comprises:

cutting the second protrusion to form a gap between two ends of the second protrusion and the second flange;

and milling the second protrusion to enable the outer side surface of the second protrusion to have a second step part.

11. The method of claim 1, wherein the step of finishing the sheet metal material to form the metal shell comprises:

extruding the second folded edge to enable the thickness of the second folded edge to accord with a third parameter standard value;

and chamfering the outer side surface of the metal plate.

12. The method of claim 11, wherein said step of finishing said sheet metal material to form said metal shell further comprises:

and performing at least one of polishing treatment, wire drawing treatment, sand blasting treatment and anodic oxidation treatment on the metal plate.

13. The metal shell is characterized by comprising a metal plate and a plastic part attached to the periphery of the inner side face of the metal plate, wherein a second protrusion and a second folded edge are arranged on the metal plate, the second protrusion and the second folded edge are formed by stamping and extruding, and the plastic part is respectively occluded with the second folded edge and the periphery of the inner side face of the metal plate.

Background

With the popularization of notebook computers, people have higher and higher quality appeal to the notebook computers, for example, the notebook computers are required to be light, thin, durable, beautiful and elegant. In order to meet the requirements of attractive appearance and atmosphere, the shell of the existing notebook computer is mostly formed by integrally punching metal, or an integral metal shell is formed on a whole metal plate in a hollowed mode.

However, in the actual operation process, the appearance of the metal shell formed by integrally punching and molding metal is general and cannot meet the higher requirements of people; the metal shell formed by adopting the hollowing mode has the advantages of more CNC (computer numerical control) processes, complex process flow, high manufacturing cost and incapability of being well popularized in the market.

Disclosure of Invention

In view of the above, it is necessary to provide a method for manufacturing a metal shell and a metal shell to solve the above problems.

An embodiment of the present application provides a method for manufacturing a metal shell, including:

stamping a first area and a second area of a metal plate material to form two first bulges on the metal plate material, wherein the first area and the second area are respectively provided with a through part penetrating through the metal plate material, and the first area and the second area are positioned on the same side of the metal plate material;

extruding the first bulge to enable the thickness of the first bulge to accord with a first parameter standard value;

milling the first bulge which meets the standard value of the first parameter to form a second bulge, wherein the height of the second bulge meets the standard value of the second parameter;

stamping the periphery of the metal plate except the first area and the second area to form a first folded edge on the periphery;

extruding the first folded edge to enable the thickness of the first folded edge to meet the first parameter standard value;

milling the first folded edge which meets the standard value of the first parameter to form a second folded edge, wherein the height of the second folded edge meets the standard value of the second parameter;

processing the surface of the periphery of the inner side surface of the metal plate to form a micro-hole;

arranging a mold on the metal plate, wherein an injection molding opening is formed between the mold and the second folded edge;

inserting a plurality of injection molding pieces into the injection molding opening;

performing nano injection molding on the periphery of the inner side surface of the metal plate to form a plastic part between the metal plate and the mold, wherein the plastic part is meshed with the metal plate;

removing the mould;

the metal plate is subjected to a finishing treatment to form the metal shell.

In some embodiments, the step of stamping a first region and a second region of a metal plate material to form two first protrusions on the metal plate material, the first region and the second region respectively forming a through portion penetrating through the metal plate material, the first region and the second region being located on the same side of the metal plate material includes:

performing first stamping on the first area and the second area, so that an included angle between stamped metal surfaces on the first area and the second area and a surface perpendicular to the metal plate is a first acute angle;

performing second stamping on the first area and the second area, so that an included angle between the stamped metal surfaces on the first area and the second area and a surface perpendicular to the metal plate is a right angle;

and hollowing out the punched metal on the first area and the second area to form two first bulges on the metal plate, wherein the first area and the second area respectively form a through part penetrating through the metal plate, and the first area and the second area are positioned on the same side of the metal plate.

In some embodiments, the step of stamping the periphery of the metal plate material except for the first region and the second region to form a first side on the periphery comprises:

performing third stamping on the periphery to enable an included angle between the stamped metal surface on the periphery and a surface perpendicular to the metal plate to be a second acute angle;

and fourthly, punching the periphery to enable an included angle between the punched metal surface of the periphery and a surface perpendicular to the metal plate to be a right angle, so that the first folded edge is formed on the periphery.

In some embodiments, the metal plate material includes a first edge and a second edge disposed opposite to the first edge, both of the through portions being located at the first edge;

after the step of milling the first folded edge meeting the first parametric standard value to form a second folded edge, wherein the height of the second folded edge meets the second parametric standard value, the method further comprises:

performing bending treatment on the second folded edge of the first edge so that an included angle between the second folded edge of the first edge and a surface perpendicular to the metal plate is a third acute angle;

and performing corner bending treatment on the second folded edge of the second edge so as to enable an included angle between the second folded edge of the second edge and a surface perpendicular to the metal plate to be a fourth acute angle.

In some embodiments, the cross-sectional area of the injection port decreases in a direction toward the mold.

In some embodiments, the end of the second flange has a first step portion, an expansion opening communicated with the injection opening is formed between the first step portion and the mold, a groove is formed in an inner side surface of the second flange, the groove extends along a length direction of the second flange, and the groove is used for enabling the plastic part to be engaged with the second flange.

In some embodiments, a plurality of abutting pieces are arranged on the mold, and when the mold is arranged on the metal plate, the plurality of abutting pieces are abutted against the inner side surface of the metal plate.

In some embodiments, the injection molding part comprises a first conduction part, a second conduction part and an injection molding head which are sequentially communicated, the first conduction part is communicated with the injection molding equipment, the injection molding head is matched with the injection molding port, and a fifth acute angle is formed between the second conduction part and the injection molding head.

In some embodiments, the length of the end of the injection head away from the second conduction part ranges from 7.5mm to 8.5mm, and the width ranges from 0.75mm to 0.85 mm.

In some embodiments, after the step of removing the mold, the method further comprises:

cutting the second protrusion to form a gap between two ends of the second protrusion and the second flange;

and milling the second protrusion to enable the outer side surface of the second protrusion to have a second step part.

In some embodiments, the step of finishing the metal plate material to form the metal shell comprises:

extruding the second folded edge to enable the thickness of the second folded edge to accord with a third parameter standard value;

and chamfering the outer side surface of the metal plate.

In some embodiments, the step of finishing the metal plate material to form the metal shell further comprises:

and performing at least one of polishing treatment, wire drawing treatment, sand blasting treatment and anodic oxidation treatment on the metal plate.

An embodiment of the application still provides a metal casing, including sheet metal, attached the plastic part of sheet metal's medial surface border, sheet metal is last to be provided with the protruding and second hem of second, the second protruding with the second hem is formed by punching press, extrusion, the plastic part respectively with the second hem with sheet metal's medial surface border looks interlock.

According to the manufacturing method of the metal shell and the metal shell, the first area and the second area of the metal plate are formed into the second bulge through the processes of stamping, extruding and milling, and the second bulge can be used for arranging a rotating shaft of a notebook computer; forming a second folded edge on the periphery of the metal plate through stamping, extruding and milling processes; the inner side surface periphery of the metal plate is subjected to nano injection molding to form an injection molding part, and the injection molding part can be used for being connected with related elements of a notebook computer. The metal shell manufactured by the manufacturing method is integrally formed by a whole metal plate, the outer side surface of the metal shell is attractive and atmosphere, the CNC manufacturing process is saved, the process flow is simple, the manufacturing cost is low, the market popularization is facilitated, and the satisfaction degree of customers is improved.

Drawings

Fig. 1 is a schematic flow chart of a method for manufacturing a metal housing according to an embodiment of the present application.

Fig. 2 is a schematic perspective view of a formed metal plate according to an embodiment of the present application.

Fig. 3 is a schematic sectional view taken along the direction iii-iii in fig. 2.

Fig. 4 is a detailed flowchart of step S2 in fig. 1.

Fig. 5 is a schematic specific flowchart of step S8 in fig. 1.

Fig. 6 is a schematic perspective view of a metal shell according to an embodiment of the present application.

FIG. 7 is a schematic view of the assembled structure of the metal plate material in the VII-VII direction of FIG. 6 with the mold plate during injection molding.

Fig. 8 is a schematic perspective view of an injection-molded part according to an embodiment of the present application.

Fig. 9 is a detailed flowchart of step S24 in fig. 1.

Description of the main elements

Metal housing 100

Sheet metal 10

First side 11

Second side 12

First region 13

Second region 14

Second projection 15

Gap 152

Second step portion 154

Second flange 16

First step 162

Groove 164

Plastic part 20

Mold 200

Injection port 202

Injection molding 204

First conduction piece 2042

Second conduction piece 2044

Injection head 2046

Third conduction part 2048

Expansion port 206

Abutment 208

Detailed Description

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

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, it is to be noted that the meaning of "a plurality" is two or more unless specifically defined otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be mechanically coupled, electrically coupled, or in communication with each other, directly coupled, or indirectly coupled through intervening media, in which case they may be interconnected, or in which case they may be in an interconnecting relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise direct contact between the first and second features through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Referring to fig. 1, an embodiment of the present application provides a schematic flow chart of a method for manufacturing a metal housing. The order of the steps in the flow chart may be changed and some steps may be omitted according to different needs. For convenience of explanation, only portions related to the embodiments of the present application are shown. The manufacturing method of the metal shell comprises the following steps.

Step S2: the method comprises the steps of stamping a first area and a second area of a metal plate to form two first bulges on the metal plate, wherein the first area and the second area respectively form a through part penetrating through the metal plate, and the first area and the second area are positioned on the same side of the metal plate.

In this embodiment, the metal plate may be made of aluminum alloy, magnesium aluminum alloy, or other metal materials suitable for being used as a housing of an electronic device, and the electronic device may be a notebook computer, a tablet computer, a mobile phone, or other devices. The metal shell can be a shell for installing a display screen on a notebook computer, and can also be a back shell of equipment such as a tablet personal computer, a mobile phone and the like. The present disclosure will be described in detail by taking a metal casing as an example of a casing for mounting a display screen on a notebook computer, and it should be understood that this is not a limitation of the present disclosure.

Referring to fig. 2 and 3 together, in step S2, the metal plate 10 is substantially rectangular and planar, the metal plate 10 includes a first side 11 and a second side 12 opposite to each other, the first side 11 and the second side 12 are long sides of the metal plate 10, the remaining two sides are short sides of the metal plate 10, and the first region 13 and the second region 14 are regions on the first side 11. The first region 13 and the second region 14 are punched by a punching apparatus in a direction perpendicular to the metal plate material 10 to form two first protrusions (not shown) on the metal plate material 10. Accordingly, after the metal of the first region 13 and the second region 14 is cut, the first region 13 and the second region 14 are formed with a penetrating portion penetrating the metal plate material 10. Therefore, the through part and the first bulge can be used for installing the rotating shaft of the notebook computer.

Referring to fig. 4, the specific flow of step S2 is as follows.

Step S202: the first region 13 and the second region 14 are first stamped such that the stamped metal surfaces of the first region 13 and the second region 14 form a first acute angle with a plane perpendicular to the metal blank 10.

Specifically, the first region 13 and the second region 14 are first stamped by the stamping apparatus in a direction perpendicular to the metal plate material 10, so that an included angle between the stamped metal surfaces on the first region 13 and the second region 14 and a plane perpendicular to the metal plate material 10 is a first acute angle. The first stamping can be performed on the first region 13 and the second region 14 by using 110-ton stamping equipment, and a first acute angle is formed after the first stamping, so that the bond acting force between molecules on the metal plate 10 can be prevented from being damaged, and the structural strength of the metal plate 10 can be enhanced. The first acute angle is preferably 70 °. It is understood that the first acute angle may also be 10 °, 20 °, 30 °, 40 °, 50 °, 60 °, 80 °, or other acute angle.

Step S204: the first and second regions 13 and 14 are subjected to a second punching so that the punched metal surfaces of the first and second regions 13 and 14 are at right angles to the plane perpendicular to the metal plate material 10.

Specifically, the second punching is continued on the first punching on the first area 13 and the second area 14, so that the included angle between the punched metal surface on the first area 13 and the punched metal surface on the second area 14 and the surface perpendicular to the metal plate material 10 is a right angle. The second stamping continues with the first region 13 and the second region 14 using a 110 ton stamping apparatus.

Step S206: the punched metal of the first area 13 and the second area 14 is hollowed out to form two first protrusions on the metal plate 10, the first area 13 and the second area 14 respectively form a through part penetrating through the metal plate 10, and the first area 13 and the second area 14 are located on the same side of the metal plate 10.

Specifically, after the first region 13 and the second region 14 are subjected to the first punching and the second punching, two projections projecting from the surface of the metal plate material 10 are formed. The portion of the bump parallel to the face of the metal plate 10 is cut, and the bump is cut so that only the portion perpendicular to the face of the metal plate 10 remains, and this portion forms a first bump, which is substantially U-shaped. Accordingly, the first region 13 and the second region 14 are pierced to form a through portion penetrating the metal plate 10.

Step S4: and extruding the first bulge so that the thickness of the first bulge meets the first parameter standard value.

Specifically, the first protrusion is subjected to upsetting processing by the extrusion device in a direction perpendicular to the metal plate 10, so that the height of the first protrusion in the direction perpendicular to the metal plate 10 is reduced, the thickness of the first protrusion is increased, and the first parameter standard value may be 1.45 mm. In this embodiment, carry out twice mound through 200 tons of extrusion equipment to first arch and be thick, the mound is thick for the first arch thickness becomes 1.27mm for the first time, and the mound is thick for the second time makes first arch thickness become 1.45 mm. So, thick through twice mound, avoid first arch to be extruded and damage, be favorable to guaranteeing first bellied structural strength.

It is understood that in other embodiments, the first protrusion may be subjected to the pier thickening process by one, three, four or more times of pier thickening. The pressing power of the pressing device can also be increased or decreased accordingly.

Step S6: and milling the first bulges which accord with the standard value of the first parameter to form second bulges 15, wherein the height of the second bulges 15 accord with the standard value of the second parameter.

Specifically, after the first protrusion is extruded, the thickness of the first protrusion meets the standard value of the first parameter. The first bump is subjected to a milling process to change the appearance and size of the first bump, thereby forming the second bump 15. The height of the second protrusion 15 meets the second parameter standard value. The second parameter standard value can be designed according to actual requirements, and the second parameter standard value is not limited in the application.

Thus, the second protrusions 15 are formed on the metal plate material 10 through the steps S2 to S6.

Step S8: the periphery of the metal plate 10 excluding the first region 13 and the second region 14 is punched to form a first fold on the periphery.

In this embodiment, the periphery of the metal plate 10 does not include the positions corresponding to the first region 13 and the second region 14. The peripheral ring of the metal plate 10 is punched by a punching device along the direction perpendicular to the metal plate 10, and the corresponding metal on the peripheral ring is bent towards the side far away from the punching device under the action of the punching device, so that a first folded edge is formed.

Referring to fig. 5, the specific flow of step S8 is as follows.

Step S802: and performing third punching on the periphery so that an included angle between the punched metal surface of the periphery and a surface vertical to the metal plate material 10 is a second acute angle.

Specifically, the third punching is performed on the circumference by the punching device in the direction perpendicular to the metal plate material 10, so that the included angle between the punched metal surface on the circumference and the plane perpendicular to the metal plate material 10 is a second acute angle. The third punching press can adopt 160 tons of punching equipment to carry out the third punching press to the periphery, and a second acute angle is formed after the third punching press, so that the bond acting force between molecules on the metal plate 10 can be avoided being damaged, and the structural strength of the metal plate 10 is favorably enhanced. The second acute angle is preferably 70 °. It is understood that the second acute angle may also be 10 °, 20 °, 30 °, 40 °, 50 °, 60 °, or other acute angle.

Step S804: and performing fourth punching on the periphery so that an included angle between the punched metal surface of the periphery and a surface perpendicular to the metal plate 10 is a right angle, and forming a first folded edge on the periphery.

Specifically, the fourth punching is continued on the periphery on the basis of the third punching, so that the included angle between the punched metal surface on the periphery and the surface perpendicular to the metal plate material 10 is a right angle. Fourth stamping the metal of the periphery is subjected to fourth stamping by adopting 110-ton stamping equipment.

It will be appreciated that after the fourth stamping of the peripheral ring, the angle between the stamped metal surface of the peripheral ring and the face of the metal blank 10 may also be 80 °.

Step S10: and extruding the first folded edge so that the thickness of the first folded edge meets a first parameter standard value.

Specifically, the first folding edge is subjected to upsetting processing by the extrusion device in a direction perpendicular to the metal plate 10, so that the height of the first folding edge in the direction perpendicular to the metal plate 10 is reduced, and the thickness is increased. The first parameter standard value may be 1.45 mm. In this embodiment, carry out twice mound through 200 tons of extrusion equipment to first hem and be thick, the mound is thick for the first time and makes the thickness of first hem become 1.27mm, and the mound is thick for the second time makes the thickness of first hem become 1.45 mm. So, thick through twice mound, avoid first hem to be damaged by the extrusion, be favorable to guaranteeing the structural strength of first hem.

It is understood that in other embodiments, the first folded edge may be further processed by upsetting one, three, four or more times. The pressing power of the pressing device can also be increased or decreased accordingly.

Step S12: and milling the first folded edge which meets the standard value of the first parameter to form a second folded edge 16, wherein the height of the second folded edge 16 meets the standard value of the second parameter.

Specifically, after the first folded edge is extruded, the thickness of the first folded edge meets a first parameter standard value. The first flange is milled to change the appearance and size of the first flange to form the second flange 16. The height of the second flange 16 meets the second parametric specification. The second parameter standard value can be designed according to actual requirements. It will be appreciated that the height of the second flange 16 may be different from the height of the second projection 15, depending on different requirements.

In some embodiments, after step S12, the metal plate 10 on which the second protrusion 15 and the second folded edge 16 have been formed may be subjected to a polishing process to improve the appearance quality of the metal plate 10.

In some embodiments, after step S12, the method for manufacturing a metal shell further includes the following steps.

Step S132: the second fold 16 of the first edge 11 is bent such that an angle between the second fold 16 of the first edge 11 and a plane perpendicular to the metal blank 10 is a third acute angle.

Specifically, the second flange 16 of the first edge 11 is bent by a 110 ton machine so that the angle between the second flange 16 of the first edge 11 and the plane perpendicular to the metal plate 10 is a third acute angle. The second flap 16 of the first side 11 may be angled toward the second side 12 or away from the second side 12. In this embodiment, the third acute angle is 10 °, and the second fold 16 of the first edge 11 is angled away from the second edge 12. It is understood that in other embodiments, the third acute angle may also be 20 °, 30 °, 40 °, 50 °, 60 °, or other acute angles.

Step S134: the second folded edge 16 of the second side 12 is bent such that an angle between the second folded edge 16 of the second side 12 and a plane perpendicular to the metal plate 10 is a fourth acute angle.

Specifically, the second flange 16 of the second side 12 is bent by a 110 ton machine so that the angle between the second flange 16 of the second side 12 and the plane perpendicular to the metal plate 10 is a fourth acute angle. The second flap 16 of the second side 12 may be curved in a direction towards the first side 11 or may be curved away from the first side 11. In this embodiment, the fourth acute angle is 16 °, and the second fold 16 of the second edge 12 is bent in the direction of the first edge 11. It is understood that in other embodiments, the third acute angle may also be 26 °, 36 °, 46 °, 56 °, 66 °, or other acute angles.

It will be appreciated that the second fold 16 on the short side of the sheet metal 10 may also be angled.

In some embodiments, after step S12 or after step S134, the metal plate 10 on which the second protrusion 15 and the second folded edge 16 have been formed may be calibrated and checked to ensure the quality of the metal plate 10, so as to avoid the poor quality of the metal plate 10 after injection molding.

In some embodiments, after calibrating and inspecting the metal plate 10, the metal plate 10 is machined by CNC so that the end of the second flange 16 forms a first step 162, the inner side of the second flange 16 forms a groove 164, the groove 164 extends along the length of the second flange 16, and the groove 164 is used for engaging the plastic formed by injection molding with the second flange 16.

Step S14: the inner peripheral surface of the metal plate 10 is treated to form micro-holes.

Referring to fig. 6 and 7, in particular, the inner peripheral surface of the metal plate 10 is subjected to a T-treatment to form micro-holes on the inner peripheral surface, which is beneficial to increase the bonding between the plastic part 20 formed by injection molding and the metal plate 10. The flow of the T process is roughly: degreasing, namely removing oil stains on the circumferential surface of the inner side surface of the metal plate 10; cleaning, namely cleaning the metal plate 10, wherein the metal plate 10 is easy to chemically react with strong alkali, so that the metal plate should be immediately cleaned after degreasing treatment; pickling, namely etching holes on the circumferential surface of the inner side surface of the metal plate 10 by acid liquor; and (4) etching by using a T agent, and forming smaller nano holes on the peripheral surface of the inner side surface of the metal plate 10 by using the T agent. After the T treatment, micropores of 20nm to 40nm and crystal grains of 50nm to 80nm are formed on the peripheral surface of the inner side surface of the metal plate 10, so that the plastic part 20 formed by injection molding can be firmly combined with the metal plate 10.

Step S16: a mold 200 is disposed on the metal plate 10, and an injection opening 202 is formed between the mold 200 and the second flange 16.

Specifically, the metal plate 10 forming the second protrusion 15 and the second flange 16 is wrapped in the mold 200, and the mold 200 completely covers the inner peripheral surface of the metal plate 10. An injection port 202 for injection molding is formed between the mold 200 and the second flange 16.

The cross-sectional area of the injection port 202 gradually decreases in a direction toward the mold 200, and it is understood that the cross-sectional area of the injection port 202 gradually decreases in a flow direction of the liquid resin. In this embodiment, the injection opening 202 is substantially an inverted quadrangular prism.

The end of the second flange 16 has a first step 162, and an expansion opening 206 communicated with the injection opening 202 is formed between the first step 162 and the mold 200, so that the liquid resin can flow into the inner peripheral surface of the metal plate 10 through the injection opening 202 and the expansion opening 206. With continued reference to fig. 3, the height h1 of the first step portion 162 ranges from 0.25mm to 0.35mm, and the width w1 of the first step portion 162 ranges from 0.75mm to 0.85mm along the direction perpendicular to the metal plate 10. In the present embodiment, the height h1 of the first step portion 162 is preferably 0.3mm, and the width w1 of the first step portion 162 is preferably 0.8 mm. It is understood that in other embodiments, the height h1 of the first step 162 may be 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, etc., and the width w1 of the first step 162 may be 0.75mm, 0.76mm, 0.77mm, 0.78mm, 0.79mm, 0.81mm, 0.82mm, 0.83mm, 0.84mm, 0.85mm, etc.

Step S18: a plurality of injection molded parts 204 are inserted into the injection port 202.

Referring to fig. 8, the injection molding part 204 includes a first conducting part 2042, a second conducting part 2044 and an injection molding head 2046, which are sequentially communicated with each other, the first conducting part 2042 is communicated with the injection molding equipment, the injection molding head 2046 is adapted to the injection molding port 202, and a fifth acute angle is formed between the second conducting part 2044 and the injection molding head 2046. In this way, the injection molding part 204 can enable the injection head 2046 to be inserted into the injection port 202 through the fifth acute angle, which is beneficial for injection molding of the metal plate 10.

In this embodiment, the length d1 of the end of the injection head 2046 away from the second conducting element 2044 ranges from 7.5mm to 8mm, and the width w2 ranges from 0.75mm to 0.85 mm. It is understood that the length d1 of the end of the injection head 2046 away from the second conduction member 2044 may be 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8mm, 8.1mm, 8.2mm, 8.3mm, 8.4mm, 8.5mm, etc., and is preferably 8 mm. The width w2 of the end of the injection head 2046 away from the second conduction member 2044 may be 0.75mm, 0.76mm, 0.77mm, 0.78mm, 0.79mm, 0.8mm, 0.81mm, 0.82mm, 0.83mm, 0.84mm, 0.85mm, etc., preferably 0.8 mm.

In other embodiments, the injection molded part 204 further includes a third conducting part 2048, and the third conducting part 2048 is connected between the first conducting part 2042 and the second conducting part 2044 and is communicated with the first conducting part 2042 and the second conducting part 2044. The third conducting element 2048 is vertically connected to the first conducting element 2042, an included angle is formed between the second conducting element 2044 and the third conducting element 2048, and the injection molding head 2046 is extended along a direction perpendicular to a plane formed by the first conducting element 2042 and the third conducting element 2048. Thus, through the third conduction piece 2048, a fifth acute angle can be formed between the second conduction piece 2044 and the injection molding head 2046, the inclination degree range of the second conduction piece 2044 is large, the length required by the second conduction piece 2044 is short, the stroke of the liquid resin in the injection molding piece 204 is short, and the flow of the liquid resin is facilitated. It is understood that in other embodiments, the third conductive element 2048 may be omitted.

Step S20: and performing nano injection molding on the inner side periphery of the metal plate 10 to form a plastic part 20 between the metal plate 10 and the mold 200, wherein the plastic part 20 is engaged with the metal plate 10.

Before the mold 200 is disposed, a connecting member (not shown) may be disposed on a corresponding portion of the inner peripheral surface of the metal plate 10, and the connecting member may be a copper nail. Connectors disposed adjacent the first region 13 and adjacent the second region 14 may be used to mount the hinge of the notebook. And during injection molding, the connecting piece is wrapped by liquid resin, and the connecting piece is fixedly wrapped after the resin is cooled and solidified. The liquid resin may be one or a mixture of Polyphenylene Sulfide (PPS) and Polyamide (PA).

Step S22: the mold 200 is removed.

In this embodiment, the mold 200 is provided with a plurality of abutting pieces 208, and when the mold 200 is disposed on the metal plate 10, the plurality of abutting pieces 208 all abut against the inner side surface of the metal plate 10. By providing a plurality of abutments 208, removal of the mould 200 is facilitated. The one end of the contact piece 208 contacting the inner side surface of the metal plate material 10 is substantially hemispherical, so that the contact piece 208 does not affect the flow of the liquid resin while the contact piece 208 contacts the inner side surface of the metal plate material 10.

In this embodiment, after step S22, the plastic part 20 is already formed on the inner periphery of the metal plate 10. After step S22, the method for manufacturing the metal shell 100 further includes the following steps.

Step S232: the second protrusion 15 is cut such that a gap 152 is formed between both ends of the second protrusion 15 and the second flange 16.

Specifically, the second protrusion 15 is cut to expose a portion of the plastic part 20, so that the portion of the plastic part 20 can be connected to the rotating shaft of the notebook computer through the gap 152.

Step S234: the second projection 15 is subjected to a milling process so that the outer side surface of the second projection 15 has a second step portion 154.

Specifically, the second protrusion 15 is milled to form a second stepped portion 154 at a position where the second protrusion 15 contacts the metal plate 10, which facilitates assembly of the molded metal shell 100.

Step S24: the metal plate 10 is finished to form the metal shell 100.

Specifically, the metal plate material 10 is subjected to CNC finish machining, thereby forming the metal shell 100.

Referring to fig. 9, step S24 specifically includes the following steps.

Step S2402: and extruding the second folded edge 16 so that the thickness of the second folded edge 16 meets the standard value of the third parameter.

The thickness of the second flange 16 is subjected to an extrusion process by an extrusion apparatus so that the thickness of the second flange 16 meets a third parameter standard value. The standard value of the third parameter ranges from 0.9mm to 1.1 mm. The thickness of the second folded edge 16 may be 0.9mm, 0.91mm, 0.92mm, 0.93mm, 0.94mm, 0.95mm, 0.96mm, 0.97mm, 0.98mm, 0.99mm, 1mm, 1.01mm, 1.02mm, 1.03mm, 1.04mm, 1.05mm, 1.06mm, 1.07mm, 1.08mm, 1.09mm, 1.1mm, or the like.

Step S2404: the outer side surface of the metal plate material 10 is chamfered.

Specifically, the external corner of the outer side surface of the metal plate 10 is chamfered to improve the appearance quality of the metal shell 100.

Step S2406: the metal plate material 10 is subjected to at least one of polishing treatment, wire drawing treatment, sand blasting treatment, and anodizing treatment.

Specifically, the metal plate 10 is subjected to at least one of polishing, wire drawing, sand blasting, and anodizing to improve the appearance quality of the metal shell 100.

It is understood that the order of step S246 and step S244 may be reversed, or any combination thereof. For example, after the step S242, the outer side surface of the metal plate material 10 may be subjected to polishing treatment, and then wire drawing treatment, chamfering treatment, sand blasting treatment, and anodizing treatment.

An embodiment of the present application also provides a metal housing 100. The metal shell 100 comprises a metal plate 10 and a plastic part 20 attached to the periphery of the inner side of the metal plate 10, a second protrusion 15 and a second folded edge 16 are arranged on the metal plate 10, the second protrusion 15 and the second folded edge 16 are formed by stamping and extrusion, and the plastic part 20 is respectively engaged with the second folded edge 16 and the periphery of the inner side of the metal plate 10.

The metal casing 100 may be a casing of a notebook computer on which a display screen is mounted, or a rear casing of an electronic device such as a tablet computer and a mobile phone.

In this embodiment, when the plastic part 20 in the metal shell 100 is injection-molded, an injection opening 202 is formed between the used mold 200 and the second flange 16, and the injection opening 202 is substantially an inverted quadrangular prism, which is beneficial to injection-molding the metal plate 10.

In this embodiment, in order to facilitate the removal of the mold 200, the mold 200 is provided with a plurality of abutting members 208, and when the mold 200 is connected to the metal plate 10, the plurality of abutting members 208 all abut against the inner side surface of the metal plate 10. As such, removal of the mold 200 is facilitated by the abutment 208.

According to the manufacturing method of the metal shell 100 and the metal shell 100 provided by the application, the first region 13 and the second region 14 of the metal plate 10 form the second protrusion 15 through the processes of stamping, extruding and milling, and the second protrusion 15 can be used for arranging a rotating shaft of a notebook computer; forming a second flange 16 on the periphery of the metal plate 10 through stamping, extruding and milling processes; the inner side periphery of the metal plate 10 is formed into an injection molding part 204 through nano injection molding, and the injection molding part 204 can be used for connecting with relevant elements of a notebook computer. The metal shell 100 manufactured by the manufacturing method is integrally formed by the whole metal plate 10, the outer side surface of the metal shell 100 is beautiful and atmosphere, the CNC manufacturing process is saved, the process flow is simple, the manufacturing cost is low, the market popularization is facilitated, and the satisfaction degree of customers is improved.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.