A stainless steel middle frame and aluminum alloy die-casting plate structure and its preparation

A technology of stainless steel and aluminum alloy, which is applied in the structure of telephone sets, sub-office equipment, electrical components, etc., can solve the problems of insufficient physical strength, no internal physical structure, and nano-hole technology can not be realized simultaneously, so as to avoid antenna problems.

CN107253027BActive Publication Date: 2019-06-25深圳市宝元金实业有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-06-25

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    Figure 1
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    Figure 2
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Abstract

The invention provides a preparation method of a stainless steel middle frame and aluminum alloy die-casting plate structure. The preparation method comprises the following steps that (1) a stainless steel plate is subjected to CNC machining to be a stainless steel middle frame, and the stainless steel middle frame is subjected to nano-electrochemical corrosion treatment, so that nano holes with the diameter being 100-200 nm are formed in the surface of the stainless steel middle frame; (2) aluminum alloy die-casting is conducted, specifically, an aluminum alloy with the silicon quantity being 5%-10% is selected and subjected to casting through a die-casting machine and a die-casting mould to be formed into an aluminum alloy die-casting plate, and the aluminum alloy die-casting plate is subjected to nano-electrochemical corrosion treatment, so that nano holes with the diameter being 40-60 nm are formed in the surface of the aluminum alloy die-casting plate; (3) the stainless steel middle frame obtained in the step (1) and the aluminum alloy die-casting plate obtained in the step (2) are subjected to plasma welding treatment to obtain a stainless steel and aluminum alloy composite body; (4) the stainless steel and aluminum alloy composite body is subjected to nano injection molding machining; (5) a workpiece obtained in the step (4) is subjected to CNC machining treatment; and (6) a workpiece obtained in the step (5) is subjected to baking varnish, PVD and electrophoresis treatment.
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Description

technical field

[0001] The invention relates to the technical field of metal connection, in particular to a structure of a stainless steel middle frame and an aluminum alloy die-casting plate and its preparation. Background technique

[0002] Existing smartphone metal casings (generally 6-series aluminum alloys are the mainstream) mainly adopt CNC processing technology, which not only wastes materials, but also takes too long to process, and the strength of 6-series aluminum itself is not enough. With the application of 3D glass and ceramics on the full screen and back cover of mobile phones, as well as the process development and material application of the latest mainstream models of Apple, Xiaomi, and Huawei, 7-series aluminum has been used as a representative, and stainless steel, liquid metal Make an extension.

[0003] At present, individual manufacturers have achieved mass production of 7-series aluminum and stainless steel middle frames, but they all adopt full CNC ...

Examples

Embodiment 1

[0051] refer to Figure 1a , Figure 1b with Figure 1c , a stainless steel middle frame 1 and an aluminum alloy die-casting plate 2 structure, including a stainless steel middle frame 1 and an aluminum alloy die-casting plate 2 connected as one; the surface of the stainless steel middle frame 1 is formed with nano-holes with a diameter of 100-200nm; Nano holes with a diameter of 40-70 nm are formed on the surface of the aluminum alloy die-casting plate 2 .

Embodiment 2

[0053] The preparation method of the stainless steel middle frame and the aluminum alloy die-casting plate structure includes the following steps:

[0054] (1) The stainless steel plate is CNC-processed into a stainless steel middle frame, and the stainless steel plate is SUS304; the stainless steel middle frame is subjected to nano-electrochemical corrosion treatment, referring to Figure 1, so that nano holes with a diameter of 100-200nm are formed on the surface of the stainless steel middle frame;

[0055] (2) Aluminum alloy die-casting: select DM6 with a silicon content of 5% to 10%, and use a die-casting machine and a die-casting mold to cast and form an aluminum alloy die-casting plate; perform nano-electrochemical corrosion treatment on the aluminum alloy plate, refer to figure 2 , so that the surface of the aluminum alloy press plate forms nano-holes with a diameter of 40-70nm;

[0056] (3) The stainless steel middle frame and aluminum alloy die-casting plate obtained...

Embodiment 3

[0088] The preparation method of the stainless steel middle frame and the aluminum alloy die-casting plate structure includes the following steps:

[0089] (1) The stainless steel plate is CNC processed into a stainless steel middle frame, and the stainless steel plate is SUS316; the stainless steel middle frame is subjected to nano-electrochemical corrosion treatment, refer to figure 2 , so that the surface of the stainless steel middle frame forms nano-holes with a diameter of 100-200nm;

[0090] (2) Aluminum alloy die-casting: select ADC12 with a silicon content of 5% to 10%, and use a die-casting machine and a die-casting mold to cast and form an aluminum alloy die-casting plate; perform nano-electrochemical corrosion treatment on the aluminum alloy plate, refer to image 3 , so that the surface of the aluminum alloy plate forms nano-holes with a diameter of 40-60nm;

[0091] (3) The stainless steel middle frame and aluminum alloy die-casting plate obtained in step (1) a...