Tool path generation for fabricating optical freeform surfaces by non-resonant three-dimensional elliptical vibration cutting
Tool path generation for fabricating optical freeform surfaces by non-resonant three-dimensional elliptical vibration cutting
复制标题
非共振三维椭圆振动切削加工光学自由曲面的刀具路径生成
DOI：
10.1177/0954406213502448
复制
发表时间：
2014-05-01
影响因子：
2
通讯作者：
Zhou Xiaoqin
中科院分区：
文献类型：
--
作者：
Lin Jieqiong;Li Yingchun;Zhou Xiaoqin
难加工材料上的光学自由曲面广泛应用于光学工程、半导体和生物医学产品等领域。然而，这是一个挑战，以实现高的表面质量和复杂的表面形状，因为他们的倾向被破坏的脆性断裂在加工过程中。本文提出了一种非共振三维椭圆振动切削方法，通过使金刚石刀具在三维椭圆上作非共振振动，实现了对某些难加工材料的光学自由曲面的加工。该方法可以在不同的加工条件下对椭圆运动参数进行主动控制，从而获得最佳的切削性能。基于这种新的椭圆振动切削方法，提出了考虑刀具圆弧半径补偿的刀具轨迹生成算法，避免了过切。建立了三维表面形貌预测模型，对典型光学自由曲面--复曲面进行了仿真分析，结果表明，所提出的椭圆振动切削方法的刀位轨迹生成算法能够包络复曲面，说明了所提出的算法和技术的有效性。该刀具轨迹生成算法可用于指导光学自由曲面的加工实验。
Optical freeform surfaces on difficult-to-machine materials are used widely in a range of areas such as optical engineering, semiconductor and biomedical products. However, it is a challenge to achieve both a high surface quality and complex surface shape because of their tendency of being damaged in brittle fracture in the machining process. In this article, non-resonant three-dimensional elliptical vibration cutting method is proposed to obtain optical freeform surfaces of some difficult-to-machine materials, which is realised by making the diamond tool vibrate at a three-dimensional ellipse in the non-resonant manner. The elliptical motion parameters of this method can be taken active control under different machining conditions, which can make us get optimal cutting performance. Based on this new elliptical vibration cutting method, the algorithm of the tool path generation considering the tool arc radius compensation is proposed, which can avoid excess turning. The three-dimensional surface topography prediction model is established to verify the tool path. Simulation analysis on a typical optical freeform surface, toric surface, has shown that the tool path generation algorithm with the proposed elliptical vibration cutting method can envelope the toric surface, which has illustrated the validity of the proposed algorithm and technique. The tool path generation algorithm can be used to direct one to machine the optical freeform surface in the cutting experiments.