Composite frame structure, electronic device, and method for manufacturing the composite frame structure

1. A method for manufacturing a composite frame structure comprising:

providing a plurality of metal sheets;

welding a plurality of connecting members on a surface of the plurality of metal sheets, wherein each of the plurality of connecting members comprises a substrate and a connecting part; the connecting part is extended from a side of the substrate, and a receiving space is formed by the substrate and the connecting part; the substrate comprises a hole, the hole communicates with the receiving space and an external environment;

placing the plurality of metal sheets enclosed in an injection mold to form a metal frame, wherein the surface of the plurality of metal sheets with the plurality of connecting members faces an inside of the injection mold;

injecting a molten injection liquid into the injection mold to form a plastic frame combined with the surface of the plurality of metal sheets and a plurality of fastening parts extending from the plastic frame to pass through the holes and filling the receiving spaces of the plurality of connecting members.

2. The method of claim 1 , wherein the step of welding further comprises:

arranging a plurality of welding points on each of the plurality of connecting members;

irradiating a laser to the metal sheet and the plurality of welding points on each of the plurality of connecting members until the plurality of connecting members and the metal sheet are fused at the plurality of welding points.

3. The method of claim 1 , further comprising:

forming a blind via in the surface of the metal frame;

wherein the step of injecting further comprises:

filling the blind via with the molten injection liquid.

4. The method of claim 2 , wherein each of the plurality of connecting members further comprises a lug, the lug is connected to an ending portion of the connecting part away from the substrate and extends away from the receiving space, the lug is welded on the surface of the plurality of metal sheets.

5. The method of claim 3 , the plastic frame further comprises a protrusion, the protrusion is filled in the blind via.

6. The method of claim 1 , wherein the surface of the plurality of metal sheets with the connecting member faces an axis, a thickness in a direction perpendicular to the axis of the metal frame ranges from 0.5 mm to 1.0 mm.

7. The method of claim 6 , wherein a thickness in the direction perpendicular to the axis of each of the plurality of metal sheets is 0.8 mm.

8. The method of claim 1 , wherein a gap is formed between two adjacent metal sheets, the plastic frame comprises a filling portion filled in the gap to connect the two adjacent metal sheets.

9. The method of claim 1 , wherein the plurality of metal sheets comprise a first metal sheet and a second metal sheet adjacent to the first metal sheet, a gap is formed between the first metal sheet and the second metal sheet, the plastic frame further comprises a filling portion filled in the gap to connect the first metal sheet and the second metal sheet.

10. The method of claim 1 , wherein the step of providing a plurality of metal sheets further comprise:

providing a first metal sheet;

a second metal sheet;

a third metal sheet opposite to the first metal sheet;

a fourth metal sheet opposite to the second metal sheet;

wherein the first metal sheet and the third metal sheet are straight, the second metal sheet and the fourth metal sheet are U-shaped, the first metal sheet, the second metal sheet, the third metal sheet and the fourth metal sheet are connected end-to-end in order.

11. The method of claim 2 , wherein a focal length of the laser is in a range of 210 mm to 220 mm.

12. The method of claim 11 , wherein a width of facula of the laser is in a range of 0.46 mm to 0.5 mm.

13. The method of claim 11 , wherein a power of the laser is in a range of 3 kW to 5 kW.

14. The method of claim 1 , wherein after the step of forming the plastic frame combined with the surface of the plurality of metal sheets to obtain the composite frame structure, the method further comprises:

grinding and polishing the composite frame structure.

15. The method of claim 14 , wherein after the step of grinding and polishing, the method further comprises:

painting the composite frame structure.

16. A method for manufacturing a composite frame structure comprising:

providing a plurality of metal sheets;

welding a connecting member on a surface of the plurality of metal sheets, wherein the connecting member comprises a substrate, a connecting part, and a lug; the connecting part is extended from a side of the substrate, and a receiving space is formed by the substrate and the connecting part; the lug is connected to an ending portion of the connecting part away from the substrate and extends away from the receiving space, the lug is welded on the surface of the plurality of metal sheets;

placing the plurality of metal sheets enclosed in an injection mold to form a metal frame, wherein the surface of the plurality of metal sheets with the connecting member faces an inside of the injection mold;

injecting a molten injection liquid into the injection mold to form a plastic frame combined with the surface of the plurality of metal sheets and filling in the receiving space.

17. The method of claim 16 , wherein the step of welding further comprises:

arranging a plurality of welding points on the lug; and

irradiating a laser to the metal sheet and the plurality of welding points on the lug until the lug and the metal sheet are fused at the plurality of welding points.

18. The method of claim 16 , wherein the plastic frame comprises a first frame portion, a second frame portion, and a stepped portion formed at a junction of the first frame portion and the second frame portion; the first frame portion is annular and arranged around an axis, the second frame portion extends from the first frame portion along a direction of the axis and is arranged around the axis.

19. A method for manufacturing a composite frame structure comprising:

providing a plurality of metal sheets;

welding a connecting member on a surface of the plurality of metal sheets, wherein the connecting member defines a receiving space and a hole, the hole communicates with the receiving space and an external environment;

placing the plurality of metal sheets enclosed in an injection mold to form a metal frame, wherein the surface of the plurality of metal sheets with the connecting member faces an inside of the injection mold;

injecting a molten injection liquid into the injection mold to form a plastic frame combined with the surface of the plurality of metal sheets and a fastening part extending from the plastic frame to pass through the hole and filling the receiving space of the connecting member.

20. The method of claim 19 , wherein after the step of providing a plurality of metal sheets comprises:

forming a blind via in the surface of the metal frame;

wherein the step of injecting further comprises:

filling the blind via with the molten injection liquid.