Abstract
Demands on large off-axis aspheric mirrors with high precision have propelled innovations of new effective and economical fabrication techniques as well as ultra-precision machining systems. A new generation of forming method for large off-axis aspheric surface is introduced. Linear motion guides are employed in the tool feed systems on most of diamond turning machines. For a rotary spindle can be made easier and less expensive than a linear guide at the same accuracy level, especially in manufacturing of a large size component, a rotary arm that carries a diamond tool combined with fast tool servo is used to replace the straight line. Therefore a new structure of a rotary feed machine is developed. Combination of two rotating movement of workpiece and diamond tool, and the micro linear feed of the fast tool servo controlled by CNC system synchronously, ultra-precision large aspheric surfaces can be turned. The corresponding geometric models are presented based on constituting appropriate coordinate systems and giving equation of the off-axis aspheric surface. By computer simulation it is verified that the processing method for the large off-axis aspheric component is simple and feasible. According to the geometric models provided in this paper, the 3-D machining is achieved. This new fabrication method allows equipment investment be decreased.
Published Version
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