What are the characteristics of special sandblasting machine in the field of mobile phone communication in the application process?

Five core characteristics of application of sandblasting machine for mobile communication (3C)

It is suitable for mobile phone aluminum middle frame, stainless steel key/bracket, antenna shell, connector and small precision parts of base station, focusing on low-voltage precision, deformation control, roughness control, no iron pollution, automatic mass production, dust-free and explosion-proof, which is different from general hardware sandblasting machine.

First, the air pressure is accurate and controllable: the low pressure is refined, and the shell deformation is strictly controlled.

The pressure regulating interval is 0.15～0.5MPa, and the aluminum alloy middle frame is fixed at 0.2 ~ 0.4 MPa, and the stainless steel small piece is 0.35～0.5MPa, so as to prevent high pressure from hollowing the thin-walled aluminum shell and corner collapse (the thickness of the middle frame of the mobile phone is only 0.4 ~ 0.8 mm);

Single gun is independently and accurately regulated, and each spray gun is equipped with a miniature pressure reducing valve. The same machine can switch aluminum/stainless steel process parameters;

The air compressor is equipped with freeze-drying and three-stage oil-water filtration to prevent the blackening of aluminum parts and the watermark rust of stainless steel caused by water vapor, and ensure the consistency of the base surface before anodic oxidation.

Second, abrasive closed-loop separation: put an end to iron ion pollution and stabilize the particle size of sand (the most critical in communication industry).

Multi-stage separation system: cyclone+curtain screening+fine powder filtration for three-stage separation, separating and crushing fine powder and coarse slag, recycling qualified ceramic sand/glass beads, with abrasive utilization rate ≥ 92%;

The whole engine room, silo and lifting bucket are all lined with stainless steel, and carbon steel and iron filings are isolated from abrasive in the whole process to avoid rust of stainless steel parts in the later stage of iron infiltration and scrap of black spots on the surface of aluminum parts;

Special abrasives: B120/B170 ceramic sand and 150 ~ 300 mesh glass beads for aluminum middle frame; Fine stainless steel pellets are used for stainless steel structural parts, brown corundum coarse sand is prohibited, and the matte satin of Ra 0.6 ~ 1.6 μ m (the standard roughness of mobile phone appearance) is stabilized.

Three, spray gun and motion mechanism: multi-angle full coverage, special-shaped middle frame without spray leakage.

Frequency conversion swing of spray gun+servo fine adjustment angle, swing stroke, speed and gun distance are programmable, which is suitable for middle frame arc surface, side groove and opening step to eliminate the color difference between yin and yang;

There are two types of models:

Turntable automaton: the work loader has small turntable rotation+large turntable revolution, and small brackets and connectors rotate in all directions for sandblasting;

Pass-through conveyor line: belt frequency conversion speed regulation (adjustable from 0.5 to 3 m/min), continuous mass production of the middle frame of the whole plate, automatic gun stop and sand and electricity saving in case of material shortage;

The nozzle is equipped with boron carbide precision fine hole nozzle as standard, which has uniform sand production and wear resistance, and is suitable for fine-grained abrasive.

4. Electrical and control system: digital PLC and traceable process parameters (suitable for mobile phone quality control).

The whole machine's PLC+touch screen digitally stores the formula, and the process parameters (pressure, firing rate, conveying speed and rocking frequency) of different models (6-series aluminum/7-series aluminum/304 stainless steel) can be retrieved with one button, and the production change can be completed in 10 minutes, so the mass production consistency is stable;

The equipment comes with operation data records: sand blasting duration, air pressure fluctuation and dust removal conditions, which meet the traceability requirements of IATF16949/3C incoming process;

The hatch is safely interlocked, and the sand and gas are automatically stopped when the door is opened to prevent dust leakage and work-related injuries.

V. Dust removal and explosion protection+closed environment protection: meet the specifications of electronic dust-free workshop.

The pulse filter cartridge removes dust efficiently, and the dust emission is less than or equal to 10 mg/m, and there is no suspended dust in the workshop, so as to prevent the anode from foaming and poor coating caused by dust adhering to the shell;

Explosion-proof electrical configuration of the whole machine: the motor, switch and fan are all explosion-proof, and aluminum dust is flammable and explosive, so as to prevent the risk of electric spark deflagration (3C mandatory requirement);

Fully enclosed cabin+negative pressure exhaust, operation noise ≤75dB, suitable for dust-free and clean workshop environment; For precision small parts, wet closed sandblasting is optional, with zero dust and no water stain oxidation on the workpiece.

Sixth, the characteristics of application differentiation of subdivided products

Mobile phone aluminum middle frame (6061/7000 series aluminum): low pressure+spherical ceramic sand, CNC knife pattern removed, matte, anodic oxidation activation base surface, strict control of deformation ≤ 0.015 mm;

Stainless steel SIM bracket/key: low-pressure sandblasting with fine glass beads to remove burrs and improve fingerprint resistance, and iron abrasive pollution is strictly prohibited;

Small communication shell and RF cavity of base station: small batch of precision box machines are used to repair local fixed-point low-pressure sandblasting.