OGURA developed EARNESTBOY, vitrified diamond wheel, based on our long experience as a top-rank manufacturer of diamond styluses for record players.
2. EARNESTBOY has an excellent grinding ability to grind very hard diamond. Its stable life time without fluctuation by layer makes automation by NC grinding lathe easier.
Feature
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High quality edge
Permit the very low degree of edge chipping of 5μm or less.
The flank does not become convex and it makes a facet clear. -
Increased dimensional accuracy
Because of no fluctuation by layer and stable lifetime, you can finish as planned dimension. It's suitable for NC grinding machine.
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Short grinding time
Since cutting ability is excellent, tools can be machined quickly.
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Reduced cost
Since grinding ratios are high and grinding time becomes short, costs in total are reduced.
Uses
| Uses | Material | ||
|---|---|---|---|
| Tools manufacturing (regrinding) | PCD (polycrystalline diamond), PCBN (polycrystalline cubic boron nitride), Cemented carbide, Diamond, CVD Diamond. | ||
| Precision parts grinding | Sapphire, Ruby, Quartz, Glass | ||
PCD/PCBN Grinding
| Wheel selection | PCD | Intermediate | SD800N160V |
|---|---|---|---|
| Finish | SD1500N160V | ||
| PCBN | Intermediate to finish | SD800N100V | |
| Grinding machine | Tool grinding machines Cylindrical grinding machines Surface grinding machine and other grinding machines |
The higher the rigidity of the machine, the better to finish. Even regular grinding machines produce excellent cutting results. | |
| Grinding conditions | Peripheral speed | 800～ 1200m/min |
Increasing the peripheral speed reduces wheel wear, but degrades free cutting ability, and vice versa. |
| Feed rate (ex.) | inter mediate 0.15mm/min |
Excessive feed rate may increase the degree of chipping of the tool edge, or overload the wheel surface, thereby waste the wheel. | |
| finish 0.1mm/min |
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| Dressing | Dressing stick | The wheel should be dressed continuously or intermittently. In PCD/PCBN grinding, there are virtual no chips, so the wheel surface tends to become glazed, make dressing essential. Optimized dressing provides consistently high cutting ability, and reduces unnecessary wheel wear. | |
| Truing | Green Silicon Carbide | Truing is required when the wheel is mounted on a grinding machine. We recommend using a drive-type truing/dressing device. | |
| Grinding fluid | Water-soluble Grinding fluid | Grinding must be conducted with full-flood grinding fluid (coolant) at the grind zone. Otherwise, the workpieces may burn, etc. If oil grinding fluid (coolant) is used, take precautions against fire. | |
Grind PCD performance
Grit size and maximum chipping
Grit size and grinding ratio
