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Iron pin edge breaking is essential for chain-link performance. The iron pins are the vital parts of the chain. It combines assembled with tabs and sleeves to make the motor chains. Usually, manufacturing iron pins are in large quantities.
However, if we polish and deburr with a labor worker, this process is too expensive to afford.
Therefore we need surface finishing solutions to process it with high efficiency and good cost-effectiveness.
1. Parts condition before finishing
 | Material: iron material Appearance: before processing, parts have a black surface layer. Also, the surface is rough. The cylinder edge is round and needs to be sharp. Shape: The iron parts is a cylinder shape with no slots and holes. Size: 15mmXφ4mm Process before finishing: Heat treatment The process after finishing: anodizing |
2. Parts surface requirement
- Edge breaking and radiusing
- Remove the black layer generate from heat treatment
- Improve parts surface smoothness
3. How we process the parts
| Step | (1) Grinding | (2) Rustproof |
| Machine | Centrifugal barrel machine (without separation) | |
| Tumbling Speed | 50/60HZ (full speed) | |
| Chip Type | Ceramic media 10X10 ACT | |
| Media to Parts Ratio | 3:1 | |
| Compound Type | LC-13, PH 8 (mild grinding compound) | MC-8 diluted solvent |
| Water Level | Just cover the mass | Soak in the compound |
| Tumble Time | 1 hour | 10 min |
| Note | Manually take the parts out of the machine and rinse them | Manually take the parts out |
4. Parts condition before and after polishing
When we check the sample, we found that the part’s surface is covered with a black oxidation layer. While processing, this outer cover is ground off. The surface is homogeneous and clean. Besides, the sharp edge at both sides of the cylinder is round.
5. Other considerations
This process can also carry out with a centrifugal barrel finishing machine. However, centrifugal barrel machine is very labor-intensive and hard to achieve automation.
Also, this cylinder pin is of low commercial value. So we centrifugal disc finishing machine is preferred.
The size of ceramic media should be comparable to the size of the pin. Too small size media will extend processing time while too big size media will make a rougher surface.
We use a vibratory separator with a particular size for media and parts separation to sieve out the pins.
6. Conclusion
In this article, we share the care of cylinder pine edge radiusing and oxidation layer removing. The process is simple, but still needs to consider a few factors. In practical production, we need to fine-tune every production parameter to improve productivity.
