Influence Of The Anisotropy On Surface Roughness, Shear Angle And Cutting Force In Diamond Tuning Of Optical Crystal Materials

With the development of science and technology, a large number of accurate optical systems and instruments play a great role in a lot of important equipments. Some brittle optics materials can get the high-quality surface with cutting instead of polishing. Therefore, studying its accurate machining mechanism to obtain high-quality surface have realistic significance.The single crystal brittle optics materials are the anisotropic material. While cut in process, the machined surface roughness changes with the changes of crystal orientations. Meanwhile, the cutting force and shear angle also change with the changes of machining orientation. This paper researches on the change laws of the machined surface roughness in diamond turning of single crystal optical material and points out the reason of anisotropic distribution of machined surface roughness that the anisotropy of machined surface roughness is due to the normal stress on the cleavage plane and the shear stress along the direction of slip on the slip plane. The paper studies systematically the influence of elastic anisotropy of material on the shear angle and the cutting force. This paper also calculates theoretically the fluctuation law of the cutting force and the shear angle with the changes of cutting crystal plane and cutting orientation. Finally, the paper validates the theories that put forward from this paper by diamond turning of (110) crystal plane, (111) crystal plane of single crystal Ge and Y-cut plane of single crystal L1NbO3...