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With the advent of the 5G era, mobile phone shell materials have undergone a change from plastic to metal to non-metal. Plastic materials because of its low cost characteristics, in the low-end market is favored. Common plastic shell materials include ABS, PC, PPO, PC + ABS and other engineering plastics, as well as alloy materials combined with carbon fiber or glass fiber.


Due to the high quality requirements of the surface of the rival shell, the simple injection molding process cannot meet the requirements, so polishing the surface of the rival shell becomes a necessary processing step. This process can effectively eliminate plastic combination lines, mold marks, water lines, fog surface, frost surface, burrs, waste edges and other problems, but also can clean and repair scratches and other surface defects.
Through polishing and polishing treatment, the surface grain of the plastic mobile phone case can be uniform, so as to achieve a smooth and high gloss effect, which greatly improves the beauty and texture of the product.

1. Mobile phone plastic middle frame and rear cover manufacturing process

Injection-polishing-cleaning-spraying / coating / plating, etc. -inspection-next process

2. Mobile phone plastic case polishing problem point

1. Polishing process:
Material inspection-open coarse sandpaper (600 ~ 1500) -fine throwing cloth (800 ~ 2000) -cleaning-dry-check-packaging
2. Problems to pay attention to in polishing:
Incoming material inspection, the need to carefully check the incoming material, there is a problem need to immediately contact the last process;
Flat edge flat hole: edge, four round corners, camera, card hole, data line hole, key hole and other places;
The knife mark, grinding is not round;
Sinding marks, grinding marks are too coarse spraying cover, adjust the processing procedures and replace more fine sponge sand;
The mold line is not polished.

3. Application of equipment grinding and polishing

Photo Grinding and polishing of plastic back cover and plastic middle frame


Photo: plastic mirror polishing

4. Programming and application of grinding and polishing

Figure around the composite mold line imitation shape grinding


Photo: The plastic middle frame of the mobile phone is polished and polished

5. Corresponding equipment specification parameters

1. Speed of spindle two-head motor: 0 ~6000rpm
2. Grillplate size: 3 inch, 4 inch disc back Velcro
3. Processing size: within 190mm of diagonal line (mobile phone case within 7 inches)
4. Station: 5 working station synchronous operation
5. Workpiece fixation: vacuum suction or block magnet suction
6. CNC control system: Taiwan Baoyuan CNC system
7. Power supply: AC380V three-phase / 50 HZ / 10 kW
8. Water source: tap water

6. Characteristics of 3D grinding and polishing equipment

1. Five-axis linkage automatic imitation grinding and polishing, grinding and polishing versatility (3D metal back cover, stainless steel / aluminum alloy / liquid metal frame, plastic mold line, wiping of radium carved beauty line of the back shell, grinding and polishing of mobile phone ceramic cover plate, etc.)
2, five working stations, coarse grinding fine grinding automatic switch, high work efficiency;
3, special double-head high-speed electric spindle grinding polishing, speed stability and quality, high-speed grinding efficiency, low noise and good working environment;
4, wet grinding and polishing without dust flying, good working environment, clean and environmental protection.