A method for manufacturing high-strength mirror-surfaced alumina suitable for the integration of mobile phone back shell and middle plate frame

Abstract

The invention discloses a manufacturing method of high-strength mirror surface aluminum oxide suitable for mobile phone rear shell and frame integration and middle plate and frame integration. The manufacturing method comprises the manufacturing steps of (1) molten aluminum alloy preparation, (2) casting, (3) hot rolling, (4) intermediate annealing, (5) cold rolling and finish rolling and (6) continuous stretching and straightening, wherein the cold rolling and finish rolling technique of the fifth step comprises the steps that the one-time downward-pressing amount reaches 60%, and a stretchedcrystal fractures again through the large downward-pressing amount; then the crystal is annealed at the high temperature, the elongated structure absorbs heat to be spherized, and then 30% of the downward-pressing amount is applied to enable the crystal material to be elongated; the balance deformation texture and the deformation structure are maintained while high strength is ensured, structurebank marks are reduced as much as possible, and thus the high mirror surface oxidation effect is obtained; and then, an A5252-HT high-strength mirror surface aluminum oxide alloy strip is obtained after continuous stretching and straightening in the sixth step, the crystal material grain sizes of the surface layers, the subsurface layers and the middle interlayer of the section structure of the A5252-HT high-strength mirror surface aluminum oxide alloy strip are increased gradually, the thickness of each surface layer is greater than 20 centimillimeters, and the great mirror surface effect isstill maintained even through three damaged parts on each surface layer are milled.

Description

technical field [0001] The invention relates to the technology in the field of aluminum material production methods, in particular to a method for manufacturing a high-strength mirror-surfaced aluminum oxide that is suitable for the integration of a mobile phone rear case and a middle plate frame. Background technique [0002] The existing mobile phone back shell plus frame and middle plate frame are mainly punching and forging + full CNC or die casting + middle plate full CNC processing and manufacturing, which has high cost, low efficiency, complicated process, complex multi-stage structure composition, poor drop resistance test, and poor appearance. The effect is not high-end enough. [0003] There are mainly two methods for the existing mobile phone back shell and frame integration, and the middle plate and frame integration: one is aluminum extrusion, after the aluminum extrusion is cut into the aluminum plane for mobile phones, CNC mills out the outline of the inner ca...

AI Technical Summary

Problems solved by technology

This method uses full CNC milling, which is labor-intensive and time-consuming, and the material utilization rate is low

2. Adopting three-stage back shell, magnesium alloy die-casting + aluminum alloy frame, etc., the process is complicated and the complex structure is difficult to realize

[0004] The shortcomings brought about by these two traditional methods prompt us to urgently develop new alloy materials that can meet continuous stamping, high material strength, good elongation and reduce CNC time. At the same time, they can also be mirror anodized to meet customers' different color requirements and processing. Accuracy requirements, under this background we have developed the new material of the present invention

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