1. CBN EARESTBOY, Vitrified bond CBN wheel, is a highly valued diamond grinding wheel for PCD/PCBN materials. CBN EARNESTBOY is developed based on our EARNESTBOY. CBN EARNESTBOY is non-porous. However, the formation of adequate chip pockets, because of moderate bond wear, allows chips excrete. This new feature permits continuous grinding with long interval dressing. As a result, wheel condition is readily achieved.
2. CBN EARNESTBOY contains chemically bonded abrasive grits. Therefore, the increased grit retention prevents wasteful grain and pulls out for better grinding ratio and lower costs. Furthermore, the need to correct machining dimensions is reduced by the minimized wheel wear. The Vitrified bond has higher rigidity than resin bond, proving high-accuracy machining.
Feature
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Eliminate thermal damage
Due to the excellent cutting ability, thermal damage to metal workpiece is eliminated. When a CBN wheel is used for grinding, compressive stress remains on the workpiece surface. Both strength and wear resistance are improved, in comparison to grinding with a conventional wheel.
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Easy automation
Since the minimization of changed in wheel shape reduces the need for dressing, automation is easier than when using a conventional grinding wheel.
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High-accuracy grinding possible
High-accuracy grinding is possible because there are minimized wheel wear and high rigidity.
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Tough materials are machinable
Even difficult-to-cut ferrous materials that cannot be readily grounded by diamond or conventional wheels, can be grounded by CBN wheels.
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Cost reduction per piece
The high grinding ratio reduces the wheel cost per workpiece. Savings are also produced by less frequent dressing/truing. Rejects and regrinding are both reduced due to high-accuracy.
Uses
| Uses | Materials | ||
|---|---|---|---|
| Machinery grinding Parts grinding Tool grinding |
Carbon steel for machines structural use | Carbon steel | S _ _ C |
| Alloy steel for machine structural use | Chromium steel | SCr | |
| Chromium molybdenum steel | SCM | ||
| Nickel chromium steel | SNC | ||
| Nickel chromium molybdenum steel | SNCM | ||
| Aluminum chromium molybdenum steel | SACM | ||
| Tool steel | Carbon tool steel | SK | |
| High-speed tool steel | SKH | ||
| Alloy tool steel | SKS,SKD,SKT | ||
| Stainless steel(martensitic) | SUS | ||
| Heat-resistant steel (ferritic or austenitic) | SUH | ||
| High-carbon chromium bearing steel | SUJ | ||
| Spheroidal graphite cast iron | FCD | ||
| Unsuitable for untempered soft iron | |||
Instructions
| Grinding machine | Surface grinding machine, Cylindrical grinding machine, etc. |
CBN wheels can be used with regular grinding machines that use conventional wheels. | |
|---|---|---|---|
| Grinding conditions | Peripheral speed | 1500～ 2000m/min |
Do not exceed the maximum peripheral speed specified in the instruction slip. |
| Feed | Reciprocating grinding 10～20µm |
Excessive feed will overload the abrasive and cause problems like grit pull out or breakage. Increasing the peripheral speed and decreasing the feed will reduce the abrasive load and maximize useful life. |
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| Creep-feed grinding 3～4mm |
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| Dressing | Dressing stick | Dressing is required at the beginning of wheel use, and when the wheel surface is glazed or loaded up. Dress with an aluminum oxide dressing stick or an aluminum oxide grinding wheel. When grinding conditions are ideal, chips wear the wheel bond gradually, eliminating or reducing the need for dressing. |
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| Truing | Silicon carbide grinding wheel | Truing is required when the wheel is mounted on a grinding machine. We recommend using a drive-type truing/dressing device. |
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| Coolant | Water-soluble coolant | Grinding must be conducted with full-flood coolant at the grind zone. Otherwise, the workpiece may burn, etc. If oil coolant is used, take precautions against fire. | |
