STUDY ON MANUFACTURING TECHNOLOGY OF VITRIFIED BOND CBN GRINDING TOOLS

Vitrified bond cubic boron nitride (CBN) grinding tools are new ceramic/glass composites for grinding. This paper discussed the manufacturing principles of these materials in terms of composites theory and prepared such materials experimentally with success. The results showed that the suitable sintering temperature of vitrified bond CBN grinding tools should be lower than 800 ℃. The strength of vitrified bond CBN grinding tools was obviously affected by the difference of thermal expansion coefficient between vitrified bond and CBN abrasives. C₁ bond was more suitable for the manufacturing of vitrified bond CBN grinding tools. Within the sintering temperature range, relatively higher sintering temperature was beneficial to the strength of the bond bridge and the holding strength between bond and CBN abrasive particles.