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Zerodur glass-ceramics has been ground into a ductile mode by a 5-axis control ultraprecision grinding machine with bronze-bonded diamond wheels which have been dressed by grinding a sintered SiC plate. Zerodur glass-ceramics of extremely low thermal expansion coefficient is one of the best material to keep precision in any high technology field, though the grindability of Zerodur in a ductile mode is not good due to low fracture toughness. Various dressing methods have been tested with SD2000J150M and SD40001150M grinding wheels. The ductile mode grinding can be obtained on Zerodur samples with the dressed SD4000J150M wheel by grinding a sintered SiC plate after the removal mass of 34 mm3/mm at a unit width of wheel in order to arrange the height of cutting edges of diamond wheel. The surface roughness of 13nm rms was obtained by this grinding.

Ductile Grinding of Glass-Ceramics with Bronze-Bonded Diamond Wheels.