Research on the Method of KDP Crystal by Diamond Turning in Micro-Ductile Domain
To solve the problem of surface defects such as pits,scratches and cracks in single point diamond turning process of KDP crystal,a thermal excitation method is proposed to improve the stability of SPDT process.This method can increase ductile cutting domain depth of KDP crystal,and reduce the influence of anisotropy,machine tool's motion error,environmental vibra-tion and other factors on turning process.Through the nanoindentation test,the hardness and the brittle ductile transition depth of the KDP crystal surface under different temperature states are obtained.The fly-cutting scratch experiment on SPDT machine tools with diamond tools verifies that increasing the KDP crystal temperature appropriately can increase the critical cutting depth of KDP crystal's brittle ductile transition.Moreover,cutting experiments on KDP crystals at different temperatures show that un-der the same cutting parameters,with the increase of temperature,the surface roughness Sa decreases from 3.2nmto1.6nm.
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