CNC, stamping and forging press in the metal casing of mobile phones are the original

CNC, stamping and forging press in the metal casing of mobile phones are the original

As the metal body cell phone becomes more and more popular among people, the words about the metal body processing technology appear more and more frequently, such as CNC, stamping, forging, die casting and so on. The following is a detailed introduction of the current metal body in mobile phone commonly used processing methods.

1. Casting

Metal casting is a kind of casting in which molten metal liquid is injected into a hollow mold made of high temperature resistant materials.

Metal casting is divided into gravity casting and pressure casting according to the influence of pressure. Gravity casting refers to the process of injecting metal liquid into mold under the action of earth gravity, also known as casting. The metal liquid is usually poured into the gate by hand, and the product is obtained by filling the mold cavity, exhaust, cooling and mold by the self-weight of the metal liquid. Pressure casting is a method to make liquid or semi-liquid metal fill the die casting cavity at a high speed under high pressure and to form and solidify under pressure. The magic blue metal released by meizu, for example, is made by high-pressure casting and then spraying.

2, forged (Forging)

Forging is a kind of processing technology that USES pressure to change the shape of metal materials so as to obtain forging pieces with certain mechanical properties, shape and size.

Metal forging can be divided into hammer forging, drop hammer forging, pressure forging, end forging and rolling forging according to different pressure tools. The hammer pressure refers to heating the work object to the forging temperature and forging it between the flat hammer and the drill plate. Small pieces can be called iron by hand. For larger items, use a steam hammer. The difference between drop hammer forging and planar forging lies in that the hammer of drop hammer forging has die points, the working part bears the pressure or impact force in the die points, and then makes the plastic deformation according to the shape of die points. Pressure forging is slow, make metal extrusion plastic in the die forging method, due to metal stress is quite long, extrusion line only to the surface of forgings, and also in the center of the workpiece, can achieve the effect of internal and external uniform, such as OPPO R7 mobile phone shell is again after forging pressure is adopted to improve the surface of the anode.

3. Punching

Stamping is to use the power of stamping equipment to make the metal plate shape directly in the mold. It is a cold processing method of metal, also known as cold stamping or sheet stamping. The technological process can be roughly divided into three steps: firstly, the metal plate is fixed on the die surface, and then the upper punch head falls vertically, so that the metal plate is forced to form inside the die, and finally the punch head is lifted, and the parts are taken out for the next trimming and polishing process, which takes about 1min. For example, xiaomi's red rice note3 is a metal back cover made by stamping process.

4. CNC technology

CNC, fully known as Computer Numerical Control, refers to automatic machine tools controlled by programs, commonly known as "Numerical Control machine tools". The control system can logically process the program with control coding or other symbolic instructions, through computer decoding, enable the machine to perform the specified action, and a piece of original metal plate through long time precision processing, finally to create the desired shape. For example, apple began to use aluminum alloy from the iPhone5, and its body and frame are made of a whole aluminum alloy CNC.

It is also closely related to the processing cost, CNC dosage, processing cycle, yield, designability and appearance texture of the metal shell of the mobile phone. These influencing factors can form a process radar map. The larger the area of a process radar map, the better its comprehensive performance. From a single dimension, each dimension is divided into 10 grades, the higher the score indicates that a certain process is better in this dimension.