What are Diamond/CBN wheels (super abrasive wheels)?
What is grinding?
Grinding is a processing method that performs very fine cutting by rotating a grinding wheel (whetstone) at high speed using many hard abrasive cutting edges.
Schematic diagram of grinding process
Difference between grinding and cutting
Diamond/CBN grinding wheels (super abrasive wheels)
Grinding Wheels with diamond and CBN are called “Superabrasive Wheels”, to distinguish from conventional wheels such as aluminum oxide and silicon carbide.
* CBN (or cBN) = Cubic Boron Nitride
Comparison of Superabrasive and Conventional wheel (based on characteristics)
(1)Thermal Conductivity
Superabrasives have better thermal conductivity.
(Inhibit temperature rise of workpiece)
Deterioration risk of work hardness under proper condition is low. High quality process such as high compressive stress and low damaged layers are obtained.
(2)Hardness
Superabrasives have higher hardness.
High efficiency and accuracy as well as low cost process are obtained under proper condition. Also, continuous processing is available due to low frequency of tool change.
Classification of super abrasive wheels
Why the term "wheel" for super abrasive grains?
They were given the term "super abrasive wheel" by JIS because the Diamond Industry Association proposed to differentiate them from general abrasive whetstones.
- “Excerpt from JIS B 4131: 1998”
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Definition: The definitions of the main terms used in this standard are as follows:
a) Wheel: Grinding and (abrasive) stones mainly with a (abrasive) grain layer around the periphery or end face of a metal base.
It is called "wheel" to distinguish it from grinding and (abrasive) stones specified in JIS R 6210, JIS R 6212, etc.
The wheel with a (abrasive) grain layer holding diamond and (abrasive) grains with a bonding agent is called "diamond wheel" and the wheel with a (abrasive) grain layer holding CBN and (abrasive) grains with a bonding agent is called “CBN wheel."
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