Deterministic polishing of freeform optical surface by iterative intersection tool path in an off-axial three-mirror anastigmat imaging system

2016 ◽  
Vol 232 (5) ◽  
pp. 816-826 ◽  
Author(s):  
Fusheng Liang ◽  
Ji Zhao ◽  
Shijun Ji ◽  
Lei Lu
Keyword(s):  
Tool Path ◽  
Imaging System ◽  
Freeform Surface ◽  
Optical Surface ◽  
Registration Method ◽  
Form Accuracy ◽  
Surface Machining ◽  
Point Set Registration ◽  
High Form ◽  
Freeform Surface Machining

Deterministic polishing as the final step of freeform surface machining can acquire preferable form accuracy. In this article, a deterministic polishing model based on iterative intersection tool path is presented to meet the requirement of high-form accuracy in freeform surface. In the polishing process, on-machine measurement and point set registration method are adopted for installation error extraction and form error calculation. The iterative polishing can be finished without discharging of workpiece by on-machine measurement strategy, which will reduce the processing time and improve the machining efficiency. In addition, a boundary extension method is employed to diminish the surface edge collapse generated by edge effect. Finally, the polishing experiment of freeform optical surface in an off-axial three-mirror anastigmat imaging system is conducted to verify the effectiveness of the proposed model.

High Efficiency Tool Path Generation for Freeform Surface Machining Based on NURBS Subdivision

2014 ◽  
Vol 625 ◽  
pp. 372-377 ◽  
Author(s):  
Jiang Zhu ◽  
Akimitsu Hozumi ◽  
Tomohisa Tanaka ◽  
Yoshio Saito
Keyword(s):  
Tool Path ◽  
High Efficiency ◽  
Rapid Development ◽  
Milling Process ◽  
Tool Path Generation ◽  
Freeform Surface ◽  
Path Generation ◽  
Nurbs Surface ◽  
Surface Machining ◽  
Freeform Surface Machining

Along with the rapid development of CAD/CAM system, the smooth surfaces are widely used in industry design. Especially NURBS surface attracts rising attentions because NURBS can describe flat surface, freeform surface and so on. Currently a lot of tool path generation patterns are proposed for milling process of freeform surface. Nevertheless there are still some problems on generating efficient tool path for freeform surface under the requested surface finish roughness. In this research, in order to resolve these problems, NURBS surface is divided into some patches and the tool path is generated on each patch. This paper proposes a surface divide method and makes a comparison between this method and undivided method. As a result, it is found that dividing the surface is helpful for the making shorter tool path and increase the machining efficiency.

Tool Path Planning Assist System for Freeform Surface Machining

2010 ◽  
Vol 447-448 ◽  
pp. 321-325
Author(s):  
Jiang Zhu ◽  
Keisuke Nomura ◽  
Tomohisa Tanaka ◽  
Yoshio Saito
Keyword(s):  
Path Planning ◽  
Tool Path ◽  
Rapid Development ◽  
Cutting Process ◽  
Freeform Surface ◽  
Tool Path Planning ◽  
Surface Machining ◽  
Finish Cutting ◽  
Machining Strategies ◽  
Freeform Surface Machining

With the rapid development of CG technology and 3D scanning technology, it is easy to design the freeform surface more complexly, but it also makes it difficult to machine such complex freeform surface rapidly and accurately. In this paper, a tool path planning assist system for freeform surface machining is presented. Differing from general CAM systems, in this developed tool path planning assist system, the tool path is generated based on the features of the CAD model, and focus on the applicability of material removal process. New machining strategies for both rough cutting process and finish cutting process are presented. With the assisting of this developed system, freeform surface could be machined efficiently and accurately.

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