Research On Ultra-precision Turning Of Monocrystalline Germanium High Order Aspheric Surface

The aspheric parts based on single crystal germanium has an irreplaceable role in optical system, its applications are more and more widely both in civilian and military. In view of the traditional machining methods existing time-consuming problem, it is important to research on the ultra precision turning technology of single crystal germanium high order aspheric.The research mainly focus on the processing mechanism of the aspheric parts’material single crystal germanium. Firstly, starting from the anisotropic mechanical properties of germanium crystal, the brittle ductile transition critical cutting depth model in different crystal planes and orientation is deduced and established. Then using this model, combined with the maximum undeformed chip thickness, the relationship between feed rate and cutting depth while germanium crystal cutting in Ductile is obtained. Further, analyzed the influence of anisotropic and cutting parameters on the monocrystalline germanium aspheric surface roughness, provided theoretical basis for selecting reasonable cutting parameters in actual processing.Finally, simulated the ultra precision turning of single crystal germanium with molecular dynamics, provided theoretical references for further study.