Apple uses CNC technology to make stainless steel into the middle frame of iPhone 4s, and the antenna of iPhone 4S is embedded in the middle frame. Characteristics of stainless steel materials:
First, the thicker the wall thickness of this product, the more economical and practical it will be. The thinner the wall thickness, the higher the processing cost.
Second, the process of this product determines its limited performance. Generally, seamless steel pipe has low precision, uneven wall thickness, low brightness inside and outside the pipe, high length cost and difficult removal of internal and external pits and black spots.
Third, its detection and shaping must be done off-line. Therefore, it shows its advantages in high pressure, high strength and mechanical structure materials.
Starting with the iPhone 5, Apple chose aluminum alloy material to build the back shell of the iPhone. Characteristics of aluminum alloy materials:
One is to reduce its own weight and make the use of mobile phones more portable;
Secondly, aluminum alloy is a very good recycling material, which also reduces the waste of mobile phone materials, reduces some costs, and is of course more environmentally friendly.