- 2/22/2019 -
Due to the large chemical inertness of diamond and iron elements, diamond wheels are not suitable for grinding workpieces such as gray cast iron. However, this happens only at high temperatures. For example, when grinding with a diamond wheel, the diamond will oxidize in the air when the temperature reaches 650 ° C, and it will be graphitized when it reaches 700 ° C ~ 800 ° C. At low temperatures, these materials do not react. Therefore, as long as the appropriate grinding speed is selected and the wet grinding method is used, and the sufficient grinding fluid is supplied at the same time, the diamond grinding wheel can completely grind the casting, which has been confirmed in production practice. When wet grinding, the grinding ratio of the grinding wheel of the diamond wheel (9600) is much higher than that of the grinding of the gray cast iron with the CBN wheel (2700).
It is generally believed that CBN grinding wheels are not suitable for grinding soft materials such as mild steel, because the grinding debris generated at this time easily blocks the grinding wheel. However, the current research believes that the ceramic bond CBN grinding wheel can take the increase of the grinding wheel line speed to form fine grinding debris, and then use high-pressure jet grinding fluid to remove the grinding debris, and supply sufficient grinding fluid to prevent the grinding wheel from clogging. Therefore, the CBN grinding wheel is a kind of soft material that can grind low carbon steel (hardness greater than 30HRC). However, CBN grinding wheels are not effective in grinding any material. Usually it is not suitable for grinding cemented carbide and the combination of cemented carbide and steel, in which case the diamond wheel has a better effect.