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

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.

[1]  Suet To,et al.  Adaptive tool servo diamond turning for enhancing machining efficiency and surface quality of freeform optics. , 2015, Optics express.

[2]  Jannick P. Rolland,et al.  Freeform Optical Surfaces: A Revolution in Imaging Optical Design , 2012 .

[3]  Neil J. Naples,et al.  Fabrication of an infrared Shack-Hartmann sensor by combining high-speed single-point diamond milling and precision compression molding processes. , 2018, Applied optics.

[4]  Hu Gong,et al.  Accurate spiral tool path generation of ultraprecision three-axis turning for non-zero rake angle using symbolic computation , 2012 .

[5]  Geok Soon Hong,et al.  Optimal selection of machining parameters for fast tool servo diamond turning , 2011 .

[6]  F. Fang,et al.  Cylindrical coordinate machining of optical freeform surfaces. , 2008, Optics express.

[7]  Lu Chen,et al.  Review of optical freeform surface representation technique and its application , 2017 .

[8]  Zhiwei Lin,et al.  A generic uniform scallop tool path generation method for five-axis machining of freeform surface , 2014, Comput. Aided Des..

[9]  Andreas Tünnermann,et al.  Development, fabrication, and testing of an anamorphic imaging snap-together freeform telescope , 2015 .

[10]  Yoram Koren,et al.  Efficient Tool-Path Planning for Machining Free-Form Surfaces , 1996 .

[11]  Fengzhou Fang,et al.  Machining approach of freeform optics on infrared materials via ultra-precision turning. , 2017, Optics express.

[12]  Suet To,et al.  Virtual spindle based tool servo diamond turning of discontinuously structured microoptics arrays , 2016 .

[13]  David Le Mignant,et al.  Design and development of a freeform active mirror for an astronomy application , 2014 .

[14]  Mahmudur Rahman,et al.  A novel surface analytical model for cutting linearization error in fast tool/slow slide servo diamond turning , 2014 .

[15]  Xiaodong Zhang,et al.  Highly efficient machining of non-circular freeform optics using fast tool servo assisted ultra-precision turning. , 2017, Optics express.

[16]  Jacob Rubinstein,et al.  Supporting quadric method in optical design of freeform lenses for illumination control of a collimated light , 2015, Adv. Appl. Math..

[17]  Le Song,et al.  Spiral tool path generation for diamond turning optical freeform surfaces of quasi-revolution , 2015, Comput. Aided Des..

[18]  F. Fang,et al.  Ultra-precision machining of sinusoidal surfaces using the cylindrical coordinate method , 2009 .

[19]  Chi Fai Cheung,et al.  Analysis of surface generation in ultra-precision machining with a fast tool servo , 2010 .

[20]  Xingsheng Wang,et al.  Tool path generation for slow tool servo turning of complex optical surfaces , 2015 .

[21]  Julio Chaves,et al.  Simultaneous multiple surface optical design method in three dimensions , 2004 .

[22]  Peihua Gu,et al.  Recent development in CNC machining of freeform surfaces: A state-of-the-art review , 2010, Comput. Aided Des..

[23]  Yongtian Wang,et al.  Aberration analysis for freeform surface terms overlay on general decentered and tilted optical surfaces. , 2018, Optics express.