Abstract
Crystal germanium has the characteristics of high hardness and brittle quality. It is a common material for infrared optical parts. In order to explore the mechanical properties of germanium crystals in plastic processing and the influence of temperature on cutting, FEM software was used to conduct micro cutting simulation on the ultra-precision turning process of germanium crystals, and the cutting force, temperature and cutting energy in the cutting process were analyzed. The results show that the main cutting force and cutting resistance decrease with the increasing of the temperature. By calculating the unit cutting force and the unit cutting resistance, the change of cutting energy is reflected indirectly. By means of normalization of cutting force, the specific gravity of stress and temperature to the cutting process at different temperatures is obtained.
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