In recent years, several tool path generation algorithms for generating complex surface have been developed, especially for multi-axis for milling operations. They can realize three-axis machining of complicated asymmetric surfaces, and SSS can even realize four-axis machining. Compared with the traditional turning technology, the two technologies have one more degree of freedom by adding the precise control of the rotation angle. The two diamond turning techniques have the same geometric principle of tool path generation, except that the former requires the decomposition of the tool path. Research and development of ultra-precision machining system. The FTS diamond turning is mainly used to generate complicated micro-array structure surfaces with small vector heights and large curvature variations, while the SSS diamond turning is mainly used to generate freeform surfaces with large vector heights and small curvature variations. In contrast, FTS and SSS diamond turning techniques can accurately and rapidly generate optical surfaces thus, they have been increasingly applied and have become two key technologies of ultra-precision diamond turning. Ultra-precision grinding and fly-cutting can generate accurate surfaces, but they have relatively low machining efficiency and controllability. In: Proceedings of the American Society for Precision Engineering. Machining of freeform optical surfaces by slow slide servo method. There are four main methods for manufacturing freeform optics based on cutting process: ultra-precision grinding, fly-cutting, fast tool servo (FTS) diamond turning, and slow slide servo (SSS) diamond turning. However, the development of tool path generation algorithm and software for ultra-precision turning is relatively lagging behind. which has promoted the rapid development and popularization of ultra-precision turning equipment. An overview of ultra-precision diamond machining of microstructured freeform surfaces. Review on diamond-machining processes for the generation of functional surface structures. Ultra-precision machining technique for optical freeform and its application. Because of the special advantages of complex optical surfaces, the demand of such products has been increasing in recent years, 1–3 1. It can not only obtain sub-micron shape accuracy but also obtain nano-scale surface roughness therefore, it has become one of the most important methods of generating complex freeform optics. As a typical representative of ultra-precision machining technology, single-point diamond turning technology has good controllability.
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