Stability study of removal function for aspheric surface based on non-Newtonian fluid polishing tool

In order to improve the stability of the removal function for aspheric surface and realizes its machining. A polishing tool based on non-Newtonian fluid (silly putty) is designed. The influence of shear stress of silly putty in polishing tools on the pressure distribution on the aspheric surface is analyzed. According Preston equation, the removal function of non- Newtonian fluid polishing tool is optimized theoretically based on its surface pressure distribution with the polishing tool executing a planetary motion of the polishing tool. The influence of the structure, materials and driving mode of polishing tool on the removal function shape was analyzed. Then, the polishing tool was improved and the marks on the removal spot were removed. The effect of filling rat io of silly putty and process parameters on removal function was studied by experiments. A method of obtaining stable removal function based on non-Newtonian fluid polishing tools is presented.