A manufacturing method for etchable high-strength aluminum used in mobile phone middle board

Abstract

The invention discloses a method for manufacturing high-strength aluminum capable of being etched and used for a mobile phone medium plate. The method comprises the following 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 withdrawal and straightening. In the step (6), flattening withdrawal and straightening are added, the rear segment enters a tunnel furnace of 300 DEG C to be baked for 4-6 minutes to remove the stress, thus a high-strength aluminum alloy strip capable of being etched and used for the mobile phone medium plate keeps the balanced deformation texture and deformation structure, can be bent by 90 degrees but does not crack, and can be etched but doesnot deform. The strip has the high strength, the tensile strength T.S (sigma b / MPa) is larger than or equal to 360 MPa, the yield strength Y.S (sigma 0.2 / MPa) is larger than or equal to 300 MPa, theelongation (delta / %) is larger than or equal to 11%, and the surface hardness HV is larger than or equal to 95. The aluminum alloy strip manufactured through the method is used for the mobile phone medium plate and is high in strength, the high surface strength, the function of large-angle bending and the function of etching but not deforming are compatible, continuous stamping is met, and thus the production efficiency is high.

Description

technical field [0001] The invention relates to the technical field of aluminum material production methods, in particular to a production method for etching high-strength aluminum used in mobile phone middle plates. Background technique [0002] There are two methods for manufacturing the middle plate of the existing mobile phone. The first method is stainless steel or copper stamping and welding. The main disadvantages of stainless steel mid-plate and copper mid-plate are that nano-injection molding is not possible, the weight is heavy, the process is complicated, the effect of structural realization is limited, and the cost of copper is high, which is only suitable for high-end models. The second method of mobile phone middle plate manufacturing is die-casting, which is only suitable for the production of a single product. It cannot be continuously produced and cannot be bent in a large way. When the bending angle reaches 45°, the profile cracks, and when the bending angl...

AI Technical Summary

Problems solved by technology

The main disadvantages of stainless steel mid-plate and copper mid-plate are that nano-injection molding is not possible, the weight is large, the process is complicated, the effect of structural realization is limited, and the cost of copper is high, so it is only suitable for high-end models

The second method of mobile phone middle plate manufacturing is die-casting, which is only suitable for the production of a single product. It cannot be continuously produced and cannot be bent in a large way. When the bending angle reaches 45°, the profile cracks, and when the bending angle exceeds 80°, the profile breaks , so a large amount of CNC processing is required in the later stage, and the efficiency is low, which is not conducive to reducing costs

[0003] The shortcomings of these two methods prompt us to urgently develop new alloy materials that can satisfy continuous stamping, high material strength, good elongation, and reduce the time spent on CNC. At the same time, they can also be bent at 90° without breaking, and etching without deformation, so as to meet customers' different requirements. The design and processing accuracy requirements, under this background we developed this material