Stainless steel middle frame and aluminum alloy die-casting plate structure and preparation thereof

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.

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 ...

AI Technical Summary

Problems solved by technology

The existing stainless steel middle frame realizes the strength support of the outer frame, but there is no internal physical structure. The internal physical structure needs to be reassembled with an aluminum alloy die-casting middle plate to realize, not only the physical strength is not enough, but also the cost increases

[0004] Although individual manufacturers realize the combination of existing stainless steel middle frames and plastics through nanotechnology, they cannot solve the problem of combining composite metal nanotechnology and plastics based on the integration of stainless steel and aluminum alloy.

At present, the general process of realizing metal nanotechnology adopts electrolysis or electrochemical corrosion process, and stainless steel itself is more resistant to chemical corrosion than aluminum alloy, especially the process of creating nanoholes based on chemical corrosion in the joint state of stainless steel and aluminum alloy will not be realized simultaneously

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