| Summary: | Ductile streaks produced during diamond grinding of hard and brittle
materials have aided the subsequent process of polishing. Two novel techniques
were used to study the formation of ductile mode streaks during diamond grinding
(primary process) of germanium, silicon, and glass. In the first technique, aspheric
surfaces were generated on Ge and Si at conventional speeds (5000 rpm). In the
second technique, diamond grinding of plano surfaces on glass and Si surfaces
using high speed (100,000 rpm) was carried out. Form accuracy, surface finish and
ductile mode grinding streaks are discussed in this paper. It was found that resinoid
diamond wheels gave more ductile streaks than metal-bonded wheels but better
form accuracy was obtained with the latter. Ductile streaks were obtained more
easily with pyrex rather than with BK 7 glass thus necessitating very little time for
polishing. Ductile streaks appeared in abundance on germanium rather than silicon.
Both the novel grinding techniques were used on CNC machining centres.
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