Tool Path Generation of FTS Machined Freeform Optics Based on Filtering in Quasi-4D Coordinate Systems

Optical free-form surfaces are widely used in various fields. Ultra-precision fast tool servo technology is commonly adopted to process free-form optics. However, the surface decomposition algorithm and smoothing algorithm are immature. In this paper, the cutting points of tool path are endowed with timing characteristic based on machining parameters. Thus, the machining path can be put in a quasi four dimensional coordinate system. Then a tool path generation method based on the signal filtering technology is proposed to realize the surface decomposition and path smoothing, which can make better use of the characteristics of each machining axis of the machine tool and achieve better machining accuracy at the same time.