Basic Investigations Into The High Speed Processing Of Optical Glasses With Diamond Tools

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Abstract
For different optical glasses the high speed grinding process has been simulated by scratching glass surfaces under dry conditions with single diamond tools in the speed range from 1μm/s to 100 m/s only once and the removal mechanisms as plastic flow and brittle fracture have been analysed by direct high speed microscopic observation and subsequent scanning electron microscopy (SEM) of the scratched grooves. The generation of median cracks along the grooves is found to be restricted to low speeds in the range of some meters per second,dependent on the type of glass.A drastic change in the plastic behavior from high-viscous flow to low viscous flow has been found in the same scratching speed range. This change in the plastic behavior is assumed to be due to an increase in the generation of heat caused by internal friction and by an adiabatic pile-up of heat in front of the fast moving diamond.

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