A tool-path planning method used in computer controlled optical surfacing based on improved prim algorithm

In view of the disadvantages of existing planning methods used in CCOS techniques, such as low efficiency and workpieces containing obvious mid-frequency error after polishing, a new tool-path planning method based on improved Prim algorithm is presented. The core idea of method consists of the following steps: surface data reading, mesh generation, distribution of resident points determining, and polishing path generating. Then, comparison of raster path and the path based on improved Prim algorithm are carried out by simulations from aspects of path length and polishing texture. The results indicate that the path based on improved Prim algorithm can shorten path length as well as increase polishing efficiency; moreover, both the texture and mid-frequency errors can be improved by using the path presented. Finally, the processing experiments of raster path and the path presented are carried out. The experimental results show that the polishing efficiency and precision are improved by using the proposed method. Moreover, it can reduce the mid-frequency error of workpiece effectively. Thus, the experimental results which are in good agreement with the simulation results prove the feasibility of proposed method.