The surface treatment of the mobile phone shell using a sandblasting machine is usually carried out according to the following steps:

1. Preparation

1. Choose the right sandblasting machine

- According to the size, material and handling requirements of the mobile phone shell, choose the right model and specification of the sand blasting machine.

- Common manual sand blasting machine, automatic sand blasting machine, etc.

2. Prepare sandblasting materials

- Choose sandblasting abrasives suitable for mobile phone shell materials, such as glass beads, alumina sand, etc.

- Ensure abrasive particle size is uniform, clean and free of impurities.

3. Clean the phone cover

- Remove oil, dust and other contaminants from the surface of the housing to ensure sandblasting effect.

4. Secure the phone cover

- Use a special jig or tooling to secure the phone shell to the work table of the sandblasting machine to ensure that it does not move during the sandblasting process.

Second, sandblasting operation

1. Set sand blasting parameters

- According to the material of the phone shell and the desired surface effect, adjust the blasting pressure, blasting time, spray gun distance and other parameters.

- In general, the initial pressure can be set low and then gradually adjusted according to the actual effect.

2. Start the sand blasting machine

- According to the operation instructions of the sandblaster, start the device so that the abrasive is sprayed to the surface of the phone shell through the spray gun.

3. Sand blast evenly

- Hold the spray gun or let the automatic spray gun move evenly across the surface of the phone case to ensure that all parts are treated evenly.

4. Monitor the sand blasting process

- During the sandblasting process, check the surface treatment effect from time to time to prevent excessive sandblasting or uneven sandblasting.

Iii. Follow-up treatment

1. Clean abrasive residue

- After sandblasting, remove the abrasive residue on the surface of the phone shell.

2. Check the surface quality

- Carefully check whether the surface roughness and gloss of the mobile phone shell meet the requirements.

3. Follow-up processing (if necessary)

- Such as spray painting, coating and other follow-up treatment to enhance the appearance or protect the surface.

For example, in the treatment of a metal mobile phone shell, the appropriate granularity of alumina sand is selected, the sandblasting pressure is set to 0.5MPa, the sandblasting time is 30 seconds, after treatment, the shell surface to obtain a uniform matte effect.

It should be noted that different materials and designs of mobile phone shells may require different sandblasting parameters and treatment methods, and the process needs to be optimized through testing and experience to achieve the best surface treatment effect.