A region-based tool path generation approach for machining freeform surfaces by applying machining strip width tensor

2018 ◽  
Vol 98 (9-12) ◽  
pp. 3191-3204 ◽  
Author(s):  
Xu Liu ◽  
Yingguang Li ◽  
Xichun Xu
Keyword(s):  
Tool Path ◽  
Tool Path Generation ◽  
Strip Width ◽  
Path Generation ◽  
Freeform Surfaces ◽  
Machining Strip Width

Spiral tool path generation method in a NURBS parameter space for the ultra-precision diamond turning of freeform surfaces

2020 ◽  
Vol 60 ◽  
pp. 340-355
Author(s):  
Shuai He ◽  
Jianping Xuan ◽  
Wenhao Du ◽  
Qi Xia ◽  
Shoucong Xiong ◽  
...  
Keyword(s):  
Parameter Space ◽  
Tool Path ◽  
Tool Path Generation ◽  
Diamond Turning ◽  
Path Generation ◽  
Freeform Surfaces ◽  
Spiral Tool Path ◽  
Ultra Precision

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.

A tool path generation method for quasi-intermittent vibration assisted swing cutting

2020 ◽  
Vol 234 (6) ◽  
pp. 624-633
Author(s):  
Zhimin Zhu ◽  
Mingming Lu ◽  
Jieqiong Lin ◽  
Jiakang Zhou ◽  
Allen Yi ◽  
...  
Keyword(s):  
Tool Path ◽  
Spline Interpolation ◽  
Interpolation Theorem ◽  
Tool Path Generation ◽  
Diamond Turning ◽  
Tool Geometry ◽  
Machining Accuracy ◽  
Path Generation ◽  
Freeform Surfaces ◽  
Tool Trajectory

During the machining of freeform surfaces, the tool path will directly affect the machining accuracy of the surface, the execution of each axis of the machine tool, and the machining efficiency. Therefore, tool path planning is a very critical link in all types of diamond turning processes. In this paper, a new tool path generation strategy is proposed for machining freeform surfaces by quasi-intermittent vibration assisted swing cutting (QVASC) method. Due to the unique tool swing motion law of QVASC, the effective central angle of tool nose arc participating in the cutting is a parameter that is ignored by traditional cutting and is considered. This makes the generation of tool trajectories, tool geometry selection and freeform surfaces very different from traditional diamond cutting. According to the principle of QVASC, the tool parameters are analysed, and the tool position is designed in the cylindrical coordinate system. Interpolation was then performed by the Hermite spline interpolation theorem. The application of this strategy is discussed, and the sinusoidal surface, sinusoidal mesh surface and toric surface are taken as examples to simulate. The simulation succeeded in obtaining the tool path corresponding to the three curved surfaces processed by the QVASC method. The results prove that the tool trajectory generation strategy proposed in this paper is feasible. The proposed tool path generation strategy can provide a new reference for future freeform surfaces processing.

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