Welding structure of aluminum-based silicon carbide foil and aluminum alloy and mobile phone frame

Abstract

The utility model relates to a welding structure of aluminum-based silicon carbide foil and aluminum alloy, which comprises an aluminum alloy base and the aluminum-based silicon carbide foil, the aluminum alloy base comprises a body and an extension part, the body extends towards one side to form the extension part, and an L-shaped groove is formed by the extension part and the side surface of the body; one end of the aluminum-based silicon carbide foil is located in the L-shaped groove and fixedly welded to the body, and the welding face of the aluminum-based silicon carbide foil and the welding face of the body are located on the same plane. According to the utility model, the aluminum alloy is arranged into the base with the L-shaped groove, the aluminum alloy base is divided into the body and the extension part, the extension part plays a role in supporting the aluminum-based silicon carbide foil, so that the aluminum-based silicon carbide foil and the aluminum-based silicon carbide foil can be attached conveniently, and a better welding effect is achieved under the conditions that the boundary processing requirement is weakened and certain equipment clearance redundancy is allowed; and the body is flush with the welding surface of the aluminum-based silicon carbide foil, so that the heights of the working surfaces (splicing surfaces) of the two welded materials are consistent.

Description

TECHNICAL FIELD

[0001] The utility model relates to foil welding technical field, concretely relates to a kind of welding structure of aluminum-based silicon carbide foil and aluminum alloy and mobile phone frame. BACKGROUND

[0002] Aluminum-based silicon carbide particle reinforced composite material (AlSiC) fully combines the performance advantages of silicon carbide ceramic and aluminum metal, has high thermal conductivity, high specific strength, large specific modulus, small density, high strength, and excellent physical and chemical properties, making it play an increasingly important role in the fields of precision equipment manufacturing such as semiconductor packaging and consumer electronic structural components.

[0003] High-bulk AlSiC has a higher content of silicon carbide, making its performance more biased towards SiC, and its welding performance is very poor. AlSiC foil with a SiC component content of less than 20% and aluminum alloy have certain welding properties for homogenous heterogeneous welding, and the splicing structure can take into account the advantages of both materials, and can play the performance advantages of the materials in different functional parts of the product, especially in the packaging and consumer electronics fields, which have high application value.

[0004] Traditional stainless steel foil laser splicing often uses Figures 1-2 The two welding structure forms have better material machining performance and welding performance, and require more error redundancy during assembly and welding, so that better splicing effect can be obtained without deliberately controlling boundary machining and assembly error.

[0005] However, the machining and welding performance of AlSiC foil is poorer than that of stainless steel foil, and the foil thickness size is small (less than 0.2 mm), so the requirements for butt joint boundary machining and welding assembly are too strict. Minor machining defects or assembly errors can cause process defects such as welding leakage and spatter during laser welding processing, resulting in product scrap and greatly affecting the stability of the welding process and the consistency of the weld appearance. The misaligned lap joint can cause a certain height difference on the assembly surface, and there is a certain stress concentration at the lap joint, thereby limiting the application scenarios. Therefore, the boundary butt joint or misaligned lap joint commonly used in traditional laser splicing cannot be directly applied to the welding of AlSiC foil. INVENTION CONTENTS

[0006] Therefore, the utility model aims to provide a welding structure of aluminum-based silicon carbide foil and aluminum alloy, which weakens the boundary machining requirements, allows a certain equipment gap redundancy, and also ensures the height consistency of the working surfaces (splicing surfaces) of the two materials after welding.

[0007] First part:

[0008] The utility model discloses an aluminum base silicon carbide foil and aluminum alloy's welding structure, including aluminum alloy base, aluminum base silicon carbide foil, the aluminum alloy base includes the body and extension, the body forms the extension to one side and forms an L shape groove with the side of the body, one end of the aluminum base silicon carbide foil is located in the L shape groove, and is welded and fixed with the body, and the welding surface of the aluminum base silicon carbide foil and the welding surface of the body are located on the same plane.

[0009] The utility model discloses a base with L-shaped groove is set to aluminum alloy, and the aluminum alloy base is divided into the body and extension, and the extension supports the aluminum base silicon carbide foil, and the two are convenient to adhere to each other, so that better welding effect can be achieved under the condition that the boundary processing requirement is weakened and a certain equipment gap redundancy is allowed, and the welding surface of the body and the aluminum base silicon carbide foil is flush, so that the working surface (splicing surface) height of the two materials after welding is consistent.

[0010] As a preferred scheme, the thickness of the body is equal to the sum of the height of the extension and the thickness of the aluminum base silicon carbide foil. That is, the extension of the aluminum alloy base is formed from the bottom of the body to one side, and the bottom surface of the extension is flush with the bottom surface of the body, which is convenient for the production of the aluminum alloy base and facilitates the welding and fixing operation of the aluminum base silicon carbide foil and the aluminum alloy base.

[0011] As a preferred scheme, the extension length of the extension is not less than 1 mm. If the extension length is too short, the supporting effect is poor.

[0012] As a preferred scheme, the height of the extension is not less than 0.08 mm. If the height of the extension is too low, the supporting effect is poor.

[0013] As a preferred scheme, the height of the extension is 28-40% of the height of the body.

[0014] As a preferred scheme, the thickness of the aluminum base silicon carbide foil is 0.15-0.2 mm. Generally, only the material with a thickness less than 0.2 mm is considered as a foil. When the thickness of the aluminum base silicon carbide foil is greater than 0.2 mm, butt joint can be used for welding. If the thickness of the aluminum base silicon carbide foil is less than 0.15 mm, it is difficult to weld.

[0015] As a preferred scheme, it further includes a weld, which is located between the aluminum base silicon carbide foil and the body, and the maximum width of the weld is one-third of the thickness of the aluminum base silicon carbide foil. By setting the base with L-shaped groove, the spacing is greatly increased compared with the conventional weld (0.015 mm), and the quality and assembly requirements of the butt joint boundary between the aluminum base silicon carbide foil and the body are reduced.

[0016] As a preferred scheme, the width of the weld is 0.02-0.05 mm.

[0017] As a preferred solution, the aluminum-based silicon carbide foil material and the body are fixed by laser welding.

[0018] Second part:

[0019] A mobile phone frame comprises a first part of the aluminum-based silicon carbide foil material and the aluminum alloy welding structure. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to better understand and implement, the following detailed description of the present application is combined with the drawings. The scope of protection of the present application is not limited to the following content.

[0021] Figure 1 is a schematic diagram of the lap joint structure of the traditional stainless steel foil laser tailor-welding;

[0022] Figure 2 is a schematic diagram of the butt joint structure of the traditional stainless steel foil laser tailor-welding;

[0023] Figure 3 is a schematic diagram of the aluminum-based silicon carbide foil and the aluminum alloy welding structure;

[0024] Figure 4 is a sectional view of the aluminum-based silicon carbide foil and the aluminum alloy welding structure;

[0025] Figure 5 is a schematic diagram of the application of the aluminum-based silicon carbide foil and the aluminum alloy welding structure in a mobile phone frame;

[0026] Figure 6 is a welding example diagram of the aluminum-based silicon carbide foil and the aluminum alloy welding structure;

[0027] Figure 7 is a damage test example diagram of the aluminum-based silicon carbide foil and the aluminum alloy welding structure;

[0028] Wherein: 1-aluminum-based silicon carbide foil, 2-aluminum alloy base, 3-welding seam, 4-laser welding machine, 5-frame body, 1a-aluminum-based silicon carbide foil thickness, 2a-aluminum alloy base body height, 2b-aluminum alloy base extension length, 2c-aluminum alloy base extension height, 41-laser center offset distance. DETAILED DESCRIPTION

[0029] In the description of the embodiments of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the embodiments of the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0030] As shown in Figure 3 An aluminum-based silicon carbide foil and aluminum alloy welding structure, comprising an aluminum-based silicon carbide foil 1, an aluminum alloy base 2 and a weld 3. The aluminum-based silicon carbide foil thickness 1a is 0.15-0.2mm; the aluminum alloy base comprises a body and an extension, the body extends to one side to form the extension, the extension length 2b is not less than 1mm, and the height 2c is not less than 0.08mm; the extension and the side of the body form an L-shaped groove, the L-shaped groove is used for receiving the aluminum-based silicon carbide foil 1, the body height 2a is equal to the sum of the extension height 2c and the aluminum-based silicon carbide foil thickness 1a, and the extension height 2c is 28-40% of the body height 2a; there is a gap between the aluminum-based silicon carbide foil 1 and the aluminum alloy base body, the gap width is 0.02-0.05mm, and the maximum gap width is one third of the aluminum-based silicon carbide foil thickness 1a.

[0031] As shown in Figure 4 After the aluminum-based silicon carbide foil 1 and the aluminum alloy base 2 are spliced, the laser welding machine 4 is used to weld along the gap between the aluminum-based silicon carbide foil 1 and the aluminum alloy base body to form the weld 3, and the welding laser spot size is selected to be 0.15-0.25mm. Since the three materials (the aluminum-based silicon carbide foil 1, the body and the extension of the aluminum alloy base 2) are fused during the welding process to form a welding joint, the center position of the laser welding machine 4 can fluctuate within 0.1mm of the center of the weld, that is, the laser center offset distance 41 and the dashed line position are shown, compared with the butt joint structure of the traditional foil, the alignment requirement of the laser center is reduced, and the laser butt welding process of the AlSiC foil which is sensitive to weldability is more suitable.

[0032] As shown in Figure 5As shown in the figure, a mobile phone frame comprises a frame body 5, a 0.15mm aluminum-based silicon carbide foil 1 and a 6013 aluminum alloy base 2 are selected, the aluminum alloy base 2 is fixed on the frame body 5, after the aluminum-based silicon carbide foil 1 and the aluminum alloy base 2 are spliced, the foil surface is wiped with alcohol before welding, so that the surface of the welding joint area is clean and free of oil stains. The welding laser spot is 0.2mm, the welding power is set to 200W, the welding speed is 30mm / s, the laser focal point position is welded, argon protection is directly blown during the welding process, the gas flow size is 20L / min, the laser is welded along the seam edge contour to achieve the welding purpose, and the welding process is stable and free of splashing. Figure 6 As shown in the figure, the welded seam appearance is good after welding, and the working surface (splicing surface) of the aluminum-based silicon carbide foil 1 and the aluminum alloy base 2 is consistent in height after welding. Figure 7 As shown in the figure, the welded seam appearance is good after welding, and the working surface (splicing surface) of the aluminum-based silicon carbide foil 1 and the aluminum alloy base 2 is consistent in height after welding.

[0033] The above examples only express several embodiments of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model.

Claims

1. An aluminum-based silicon carbide foil and aluminum alloy welded structure, characterized by, The aluminum alloy base comprises a body and an extension, the body extends to one side to form the extension, the extension and the side of the body form an L-shaped slot; one end of the aluminum-based silicon carbide foil is located in the L-shaped slot and is welded to the body, the welding surface of the aluminum-based silicon carbide foil and the welding surface of the body are located in the same plane.

2. The welded structure of an aluminum-based silicon carbide foil and an aluminum alloy according to claim 1, wherein The thickness of the body is equal to the sum of the height of the extension and the thickness of the aluminum-based silicon carbide foil.

3. The welded structure of an aluminum-based silicon carbide foil and an aluminum alloy according to claim 2, wherein The extension length is not less than 1mm.

4. The welded structure of an aluminum-based SiC foil and an aluminum alloy according to claim 2, wherein The height of the extension is not less than 0.08mm.

5. The welded structure of an aluminum-based silicon carbide foil and an aluminum alloy according to claim 4, wherein The height of the extension is 28-40% of the height of the body.

6. The welded structure of an aluminum-based SiC foil and an aluminum alloy according to claim 5, wherein The thickness of the aluminum-based silicon carbide foil is 0.15-0.2mm.

7. The welded structure of an aluminum-based silicon carbide foil and an aluminum alloy according to claim 6, wherein The welding seam is located between the aluminum-based silicon carbide foil and the body, and the maximum width of the welding seam is one third of the thickness of the aluminum-based silicon carbide foil.

8. The welded structure of an aluminum-based silicon carbide foil and an aluminum alloy according to claim 7, characterized by The width of the welding seam is 0.02-0.05mm.

9. The welded structure of an aluminum-based SiC foil and an aluminum alloy according to claim 1, wherein The aluminum-based silicon carbide foil and the body are fixed by laser welding.

10. A handset frame, characterized by The welding structure of any one of claims 1-9 is included.

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