scholarly journals Tool path generation of turning optical freeform surfaces using arbitrary rake angle tools

2020 ◽  
Vol 28 (25) ◽  
pp. 38252
Author(s):  
Kaiyuan You ◽  
Guangpeng Yan ◽  
Fengzhou Fang ◽  
Zexiao Li ◽  
Yue Zhang
Keyword(s):  
Tool Path ◽  
Rake Angle ◽  
Tool Path Generation ◽  
Path Generation ◽  
Freeform Surfaces ◽  
Optical Freeform Surfaces

Tool path generation for fabricating optical freeform surfaces by non-resonant three-dimensional elliptical vibration cutting

2013 ◽  
Vol 228 (7) ◽  
pp. 1208-1222 ◽  
Author(s):  
Lin Jieqiong ◽  
Li Yingchun ◽  
Zhou Xiaoqin
Keyword(s):  
Tool Path ◽  
Three Dimensional ◽  
Tool Path Generation ◽  
Path Generation ◽  
Freeform Surfaces ◽  
Elliptical Vibration Cutting ◽  
Cutting Method ◽  
Vibration Cutting ◽  
Elliptical Vibration ◽  
Optical Freeform Surfaces

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.

Tool path generation for ultra-precision polishing of freeform optical surfaces in an off-axis three-mirror imaging system

2015 ◽  
Vol 231 (5) ◽  
pp. 814-824 ◽  
Author(s):  
Dengpeng Huang ◽  
Lei Zhang ◽  
Shijun Ji ◽  
Ji Zhao
Keyword(s):  
Tool Path ◽  
Imaging System ◽  
Concentric Circle ◽  
Tool Path Generation ◽  
Numerical Control ◽  
Path Generation ◽  
Freeform Surfaces ◽  
Primary Mirror ◽  
Tool Paths ◽  
Ultra Precision

The optical performance of the off-axis three-mirror imaging system can be greatly improved using freeform surfaces. This article focuses on the polishing of the primary mirror and tertiary mirror in an off-axis three-mirror imaging system. The primary mirror and tertiary mirror are fabricated on one monolithic substrate and described by non-uniform rational B-spline–based freeform surfaces. The separated and integrated polishing strategies are presented for polishing the two mirrors on the four-axis computer numerical control polishing platform. A tool path generation approach is proposed for polishing of the non-uniform rational B-spline–based freeform surface. Three kinds of the tool paths are given for ultra-precision polishing of the primary mirror and tertiary mirror with the freeform surfaces. The concentric circle path and the approximately concentric circle path are generated for polishing two mirrors separately, while the spiral path is calculated for integrated polishing of two mirrors simultaneously. The polishing tool posture along the planned tool paths is also analyzed. The ultra-precision polishing experiments of the primary mirror and tertiary mirror on the four-axis computer numerical control polishing platform are performed to verify the proposed approach for tool path generation.

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