How to polish zinc(aluminum) alloy handles?
Mirror polishing method and solution for zinc alloy (aluminum alloy) handles
In this case, we will discuss the polishing process of a zinc alloy (aluminum alloy) door handle.
- jerrylu
- 2024-06-03
- 0 Comments
1. Zinc alloy and aluminum alloy handle hardware before polishing
Materials:
zinc alloy
Appearance:
surface oxide scales,burrs,gray-white.
Shape:
simple curve. holes in the surface.
Size:
109*20*16mm
Pre-polishing process:
die cast
Post polishing process:
plating
2. Requirements of polishing
- smooth surface without damage
- descaling
- Reduce surface roughness, increase gloss, and improve brightness
3. Details of the zinc alloy hardware handle polishing, deburring and descaling process
| Process steps | （1） coarse finishing to deburr,descale | （2） fine polishing and brightening | （3） drying |
|---|---|---|---|
| Machine and equipment | vibratory bowl finisher | vibratory bowl finisher | vibratory dryer |
| Amplitude and speed | highest amplitude,full speed | highest amplitude,full speed | highest amplitude,full speed |
| Tumbling media | cone resin media | spherical stainless steel media | corn cob drying media |
| Abrasive media to workpiece ratio | 4：1 | 6：1 | 8：1 |
| Finishing compound | finishing liquid | polishing liquid | no |
| Water | appropriate amount, the liquid level should not exceed the tumbling media | appropriate amount, the liquid level should not exceed the tumbling media | no |
| Polishing time | 1 hour | 30 minutes | 30 minutes |
| Remark | pick up by hand and rinse with water | pick up by hand and rinse with water | pick up by hand and rinse with water |
4. Effect after finishing, polishing and brightening
5. Additional instructions
- Because the workpiece material is relatively soft, resin media can only be used to roughly remove scale and burrs. If you use ceramic deburring media, so the hardness is too high and the sand grits are too coarse, it will wear the surface of the product and cause scratches, pitting, color contamination and other problems.
- Also because of the material, if a machine is used for automatic separating, the collision of workpieces will cause surface damage.
- Zinc alloys can easily re-oxidize when exposed to water and air. Therefore, we need to dry the water immediately after polishing.
6. Final summary
- In this case, we demonstrate a process of using a resin (plastic) finishing media to deburr, remove scale and brighten on the surface of a zinc alloy handle.
- This process is also suitable for polishing belt buckles, jewelry pendants, souvenirs, craft gifts and other products produced from aluminum alloy and copper die-casting parts.