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Materials 2019, 12(5), 810; https://doi.org/10.3390/ma12050810

Adaptive Spiral Tool Path Generation for Diamond Turning of Large Aperture Freeform Optics

1
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Changchun National Extreme Precision Optics Co., Ltd., Changchun 130033, China
4
Centre for Precision Engineering, Harbin Institute of Technology, Harbin 150006, China
*
Author to whom correspondence should be addressed.
Received: 22 January 2019 / Revised: 1 March 2019 / Accepted: 5 March 2019 / Published: 8 March 2019
(This article belongs to the Special Issue Micromanufacturing of Metallic Materials)
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Abstract

Slow tool servo (STS) diamond turning is a well-developed technique for freeform optics machining. Due to low machining efficiency, fluctuations in side-feeding motion and redundant control points for large aperture optics, this paper reports a novel adaptive tool path generation (ATPG) for STS diamond turning. In ATPG, the sampling intervals both in feeding and cutting direction are independently controlled according to interpolation error and cutting residual tolerance. A smooth curve is approximated to the side-feeding motion for reducing the fluctuations in feeding direction. Comparison of surface generation of typical freeform surfaces with ATPG and commercial software DiffSys is conducted both theoretically and experimentally. The result demonstrates that the ATPG can effectively reduce the volume of control points, decrease the vibration of side-feeding motion and improve machining efficiency while surface quality is well maintained for large aperture freeform optics. View Full-Text
Keywords: freeform optics; slow tool servo; tool path generation; large aperture optics freeform optics; slow tool servo; tool path generation; large aperture optics
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Wang, D.; Sui, Y.; Yang, H.; Li, D. Adaptive Spiral Tool Path Generation for Diamond Turning of Large Aperture Freeform Optics. Materials 2019, 12, 810.

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