Reach the condition that the bearing ring is quenched and tempered with silver grey color
1, the product before quenching, control - cleaning before, try to make the quenching products without rust, no ash stains.
2. Uniformity of furnace temperature.
3, atmosphere uniformity - use 99% methanol content as much as possible.
4, use nitrogen protection - use 99.999% nitrogen content.
4, the oil and gas at the discharge port - to avoid the accumulation of oil and gas at the bottom (this condition is most important). In the mesh belt furnace on pay special attention to oil curtain sealing oil and gas; feed smoke must be pumped, don't let the smoke to play).
5, oil stability - good oxidation resistance quenching oil.
6. Strictly control moisture content in oil.
7. Strictly control the pollutants in oil.
8, intermediate cleaning - clean workpiece.
9, before tempering drying - keep tempering before entering the furnace, dry workpiece, do not have water.
