Abstract: stamping is based on press mold to impose external force on the plate, so as to get the stamping process of the required shape. According to statistics, 60-70% of the steel products in the world are plank, most of them are processed by stamping. Therefore, stamping has inherent advantages.

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Mechanical processing is inefficient, difficult to process complex structural parts, but still widely used in mobile phone processing. Why? MIM is highly efficient can process complex structural parts. At present, it is only used in small parts such as mobile phone cask, keypad so on. Why? Stamping, machining MIM are widely used in mobile phone metal parts. What are their respective advantages disadvantages?

1. Stamping

Stamping is based on press mold to impose external force on the plate, so as to get the stamping process of the required shape. According to statistics, 60-70% of the steel products in the world are plank, most of them are processed by stamping. Therefore, stamping has inherent advantages.

Stamping process has high production efficiency, short production cycle large processing range. Therefore, more mobile phone cover (lower end) adopts stamping process. Why can't stamping be made into small parts such as mobile phone so on? Because the precision of stamping is up to the requirement of mobile phone Cato. We can see that there is still a height difference in the part of Cato to facilitate the placement of SIM cards.

2. Machining

Machining refers to the process of changing the size performance of a workpiece by means of a mechanical device. Machining includes: car, milling, drilling, planing, grinding, shearing so on.

Machining without mold design manufacture, with great degree of freedom high machining accuracy, but low machining output, difficult to shape complex structure.

Although the production efficiency is low, many high price, high quality mobile phone metal frame / rear cover is still CNC milling method; on the one hand, people have found a better way; on the other hand, die casting, forging other processes are highly efficient, but surface treatment, such as anodizing, is as good as machining. In addition, machining is also suitable for two processing of burrs, drilling surface treatment.

3, MIM

"MIM is a beautiful desolate love story. The good plastic particles look at the rough metal powder, the high temperature is experienced. Finally it fits. Unfortunately, it's too long. In order to perfect the metal, the fire has been turned into ashes."

Metal injection molding (MIM) is a new technology of near net shape forming, which combines modern plastic injection molding technology with traditional powder metallurgy technology. MIM product has high dimensional accuracy (+ 0.1% + 0.5%), good surface finish (roughness 1~5 micron m), very high yield. But MIM processes are more have certain technical barriers. Why can't MIM make larger structural parts such as frame / back cover in mobile phone?

First of all, the degreasing sintering of MIM will reduce the size of the products. The larger the product size, the larger the size deviation, it is easy to degrease.

Secondly, MIM stainless steel is the most common, although stainless steel can anode, but the aluminum anode effect is good (mainly because the aluminum oxide layer is composed of aluminum oxide, forming a very regular six party test tube structure, produces similar mirror reflection effect, looks bright color).

Stamping, machining, MIM advantages disadvantages

In practical applications, a whole process often involves a variety of processing techniques, which requires us to know the advantages disadvantages of each process.

In general, machining represents the high-end market in the frame / rear cover of mobile phones. Stamping represents the middle low end of the frame / rear cover of mobile phones; MIM represents the mainstream of mobile phone parts new directions of other metal parts.