How Does Ceramic Bonding Agent Influence Abrasive Grinding Wheels?

1. The Influence on Grinding Wheel's Hardness

Superhard material--grinding wheel's hardness refers to the complexity of superabrasives falling off the grinding wheel. The more difficult it is for the superabrasives to fall off the grinding wheel, the harder the grinding wheel will be. In general, the greater the bonding agent, the stronger the force it has on the superabrasives, the more difficult it is for the superabrasives to fall off the grinding wheel, and the harder the grinding wheel will be. If poor exposure appears during the grinding process, the grinding wheel may not grind, which will increase the grinding wheel's service life, but the surface of the PDC is likely to be broken. So the grinding wheel should go through edge processing after a period of time to avoid waste products during grinding process.

2. The Influence on the Bond Strength

The PDC has a high hardness. During external grinding, the diamond on the grinding wheel's surface is confronted with enormous grinding force and impact force. If the amount of ceramic bonding agent is not abundant, the bond strength will be so weak that part of the diamond will start to fall off without giving the role of grinding to full play, resulting in a shorter service life of the grinding wheel. If the bonding agent is overabundant, the grinding wheel will be too hard and will not be sharp enough; the surface of the PDC is likely to be broken and lead to a high rejection rate.

3. The Influence on Grinding Wheel's Structure

Since the grit of the bonding agent is finer than diamond grit, the bonding agent will be compacting during the firing process. If the proportion of  the bonding agent in the grinding wheel increases, the grinding wheel will become compacting; then it may get blocked and become unable to grind. So we often need to use an ordinary grinding wheel to do edge processing on superhard grinding wheels to remove redundant bonding agent and increase the service life. Experiments prove that when the ceramic proportion is around 22wt% to 26wt%, the grinding wheel has the longest service life.

Besides, diamond density also exerts an influence on the grinding wheel's performance. The higher the density is, the longer its service life will be. With the increasing of the grinding wheel's density, the amplification of its service life is larger. For PDC external grinding, a diamond grit increase in a high-density ceramic diamond grinding wheel will play a joint force.

Author: Liwei Chu 
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