How to remove the parting line and flash from rubber sealing O-ring?
How to effectively remove parting line and flash from O-type rubber sealing ring?
In this case, we will discuss the finishing process of a rubber sealing ring to remove the parting line. The materials of this O-ring seal include silicone, nitrile rubber, fluorine rubber, Teflon, rubber, etc., and the finishing process is similar.
- jerrylu
- 2024-06-03
- 0 Comments
1. The O-ring seal with the parting line before finishing
Materials:
Rubber
Apparance:
Parting lines and flash.
Shape:
O-shaped, diameters vary in size,There are also prismatic circles.
Size:
Φ300*4mm
Pre-finishing process:
Injection molding.
Post finishing process:
Drying and packaging.
2. Finishing requirements
- Smooth surface, no parting line.
- Deflashing
- Reduce surface roughness, increase gloss, and improve brightness.
3. Details of the mold parting line removal process for rubber O-ring seals
| Process steps | （1） Rough finishing to remove parting line | （2） Fine polishing | （3） Drying |
|---|---|---|---|
| Machine and equipment | centrifugal disc finishing machine | tumbling barrel finishing machine | vibratory dryer |
| Amplitude and speed | full speed | slow speed | full speed |
| Tumbling media | spherical heavy cutting ceramic media | high-density porcelain media | corn cob drying media |
| Tumbling media to workpiece ratio | 4：1 | 6：1 | 8：1 |
| Chemical finishing compound | finishing liquid | polishing liquid | no |
| Water | appropriate amount, the liquid level should not exceed the abrasive | appropriate amount, the liquid level should not exceed the abrasive | no |
| Finishing time | 30 minutes | 12 hours | 30 minutes |
| Remark | parts separated and picked up automatically, rinsing with water | parts separated and picked up automatically, rinsing with water | dry the water and wipe away the water stains |
4. Effect after finishing and polishing
5. Additional information
- Because the rubber material is soft, elastic and tough, heavy cutting force spherical ceramic deburring media is used to roughly finish the parting line. If you use ceramic media with sharp angles, such as triangular brown corundum deburring media, they may scratch the rubber surface, causing scratches, pitting and other problems on the product surface.
- To achieve brightness on the rubber surface after rough finishing, it is necessary to use ceramic media with high density and no cutting force to achieve the polishing effect. It also requires slow work and fine work, so a barrel-type finishing machine is used.
- Rubber will age again easily 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 spherical ceramic deburring media and high-density porcelain polishing media to remove the parting line from the rubber O-ring surface.
- This process is also suitable for parting lines removing and polishing of injection molded parts, 3D printed parts, souvenirs, craft gifts and other products produced from silicone, fluorine rubber, nitrile rubber, Teflon and other materials.