3C Electronics

Glass grinding defoamer must have a high degree of uniformity and should be ground very smoothly. Generally, cerium oxide containing abrasive is used to grind optical glass. The suspending agent in the formula has the effect of stabilizing foam. If stable foam is generated, the uniformity of abrasive will be broken, and the surface finish of grinding will be affected. Adding silicone defoamer to the abrasive can ensure the quality of optical glass grinding.

Taking the processing of mobile phone metal shells as an example, common processes include aluminum ingots, CNC processing, nano antenna injection molding, polishing, logo development masking, sandblasting, primary anode, high gloss treatment, precision milling of the inner cavity, secondary anode, milling of conductive potential hot melt nuts, inspection and shipment, and other processes. Next, we will introduce the processing process of the aluminum alloy metal shell of Le Max mobile phones to introduce the general metal phone shell processing technology. Its processing technology is very typical, representing the manufacturing process of general metal phone shells. And I introduced which steps in these processes require cleaning.

Cleaning after aluminum extrusion: This process mainly involves degreasing and cleaning, including cleaning stretching oil, stamping oil, etc.

CNC CNC machine tool cleaning after milling: deburring cleaning, cleaning residual cutting fluid

Cleaning after sandblasting process: dust cleaning, cleaning ink protective layer. On other metal phones, it also includes removing glue and ink on the metal

Pre anode cleaning: clean oil stains, fingerprints, and dust

Unveiling cleaning: Clean the ink without damaging the substrate

1. Mainly clean solid surfaces with dirt such as oil, dust, and finger marks. Safe and non corrosive to substrates, coatings, inks, etc.

2. Neutral products, safe and environmentally friendly; There are no harmful substances that require special labeling in the composition.

3. Completely dissolved, easy to rinse.

Complete Explanation of CNC Processing Technology for Mobile Phone Metal Shell

In this era where user experience is highly valued, more and more mobile phone, laptop, and wearable device manufacturers are starting to focus on shell materials. From the perspective of the mobile phone industry alone, the material of the phone casing is also gradually transitioning from engineering plastic to metal.

During the evolution of mobile phone case materials, there were many combinations: plastic and metal, glass and metal, all plastic, all glass, etc., but in the end, none of them overshadowed the trend of all metal materials. In terms of actual touch experience, all metal phones do have outstanding experiences in various aspects, surpassing other materials in both appearance and feel.

When it comes to all metals, it's necessary to mention CNC. At present, the all metal shells of 3C products are mostly processed by CNC (Computer Numerical Control Machine Tools) machines. CNC has become a necessary equipment for 3C shell manufacturers due to its advantages of high efficiency, high precision, and stable processing quality.

The all-metal integrated CNC machining process was first pioneered by Apple - aluminum plates are die-cast from cylindrical solid aluminum materials, which are precision machined and first cut into the prototype of the integrated body. As the body gradually takes shape, the keyboard shape and various fine structures on the body are milled out. This process involves a total of nine CNC milling processes, after which a precise integrated shell is obtained.

Shell manufacturers need to go through multiple processes from programming to obtaining finished products, including rough machining, semi rough machining, semi precision machining, and precision machining. Many times, the entire process requires more than 10 workstations to obtain finished products. To improve the yield rate, each process needs to be strictly controlled.

　
1、 CNC machining pre process work: modeling and programming

Before starting CNC machining, modeling and programming are first required. The difficulty of 3D modeling is determined by the product structure, and modeling products with complex structures is more difficult, requiring more and more complex programming processes. Programming includes process settings for machining, tool selection, speed settings, and the distance of each tool feed. In addition, different products have different clamping methods, and fixtures need to be designed before processing. Some structurally complex products require specialized fixtures.

Programming includes the entire product's processing technology. Although CNC automation is used to complete the subsequent steps, experienced personnel must be involved in the early stages of programming to avoid multiple trials and errors and increase costs.

2、 Main processing technology (the main CNC processing technology required for manufacturing all metal mobile phone shells)

Use a high-speed drilling center to accurately mill aluminum sheets into a regular three-dimensional volume of a certain size, ready for the next processing step.

Rough milling: After positioning, rough milling is carried out to remove the inner cavity structure, positioning columns combined with fixtures, and most of the external redundant materials.

Milling antenna slots: The signal problem with all metal shells is very challenging, and it is necessary to mill out antenna slots to leave a transmission path for the signal and maintain necessary connection points to ensure the strength and overall feel of the body.

CNC precision machining: precision milling of internal cavities, external structures, external surfaces, side edges, etc.

Polishing: Use a high-speed precision CNC machine tool for polishing to eliminate knife marks and prepare for subsequent sandblasting.

Sandblasting: To treat the metal surface to a matte effect.

Anodizing:

Anodizing once: Coloring the phone, anodizing turns the aluminum into gold. Simultaneously improving the stability of surface materials

Secondary anode: A sturdy and dense oxide film is formed on the surface of the body, further enhancing its wear resistance.

The plastic shell is molded using injection molding technology, and can be mass-produced with high yield just by opening the mold. The CNC machining yield of all metal body is determined by the structural complexity and precision requirements of the shell, making it difficult to achieve high yield like plastic shell. In order to balance high costs, most manufacturing enterprises choose to purchase a large number of CNC equipment to reduce overall costs and meet productivity requirements in the face of price war.