Papers by Author: Cheng Shun Han

Abstract: Aspheric optical components are widely used as important parts of commercial optical products owing to their desirable properties. The fast growing demand needs urgently efficient and economical fabrication methods. So this paper discussed systematic geometrical models for programming tool path of precision grinding aspheric mould used in batch production. The integrated geometric models and the corresponding machining parameters, such as suitable radius of tools, tool path interval and linear feed were presented based on precision assurance for lower manufacturing cost and higher production. Therefore, it could also provide a reference for NC control software system in other kinds of aspheric surfaces manufacture.

Abstract: This study aimed to establish the coordinate transformation between the off-axis aspherics coordinate system σ and the axial symmetry aspherics coordinate system σ by transforming coordinates and present the computation models of asphericity in rectangular coordinate system and cylindrical coordinate system respectively. The asphericity expressions in both coordinate systems were applicable to the comparative sphere calculation of Off-axis aspherics with different figures. We selected an Initiation sphere in view of technology, along with equations in a right coordinate system for certain caliber and structure. Then, by numerical computation, we selected the best fitting sphere and simplifed the complex models by choosing a right coordinate system. At last, the solution for asphericity and the best fitting sphere curvature radius of off-axis aspherics were introduced by examples.

Abstract: In this paper, a new generation method for diamond turning non-axisymmetry aspheric mirrors is introduced. A rotary arm that carried a diamond tool combined with fast tool servo was used to replace the straight guides employed by most diamond turning machines. The micro linear feed of the fast tool servo was real-time calculated with the use of high resolution angular feedback on the work spindle and the swing tool. Synchronized motion of the fast tool servo according to rotating angles of the workpiece and the diamond tool produced ultra-precision non-axisymmetry aspheric surfaces. The corresponding mathematical models of NC program are presented.