Research on full-aperture ductile cutting of KDP crystals using spiral turning technique

摘要: Abstract Single point diamond face flycutting technique is widely applied to fabricate potassium dihydrogen phosphate (KDP) crystals because of their characteristics softness, brittleness, deliquescence and anisotropy. This paper studies the feasibility machining KDP through spiral turning method based on ductile cutting mechanism brittle materials. The scratch employed analyze various conditions achieving brittle–ductile transition in different directions where critical depth cut obtained. forces surface formation processes within parameters are discussed ensuring full-aperture acquired. White light interferometer Atomic Force Microscope (AFM) used evaluate coherence machined qualities directions. results indicate that varies from significantly fluctuates about 200 nm 1000 nm under experimental condition. Cutting display periodical variation with change direction trend blurs, even ultimately disappears, decrease parameters. Root-Mean-Square (RMS) value fabricated roughness 1.3 nm 1.7 nm whole no distinct anisotropic distribution morphology according observed by AFM. Compared method, has capability generate complex profiles such as aspheric or freeform surfaces can also be compensate deformation error caused vacuum suction during fabrication.