Research On The Trajectory Of Complex Optical Surface In Polishing

Complex optical surfaces components exists many incomparable superiority in improving the performance of the optical system, such as achieving special optical properties, reducing the number of system components, reducing system size, etc. In the aerospace industry, defense, communications, biomedical, energy, vehicles, etc. and civilian areas with growing application requirements. Complex optical surfaces can get a breakthrough in these important areas. The key lies in the ability to achieve high efficiency, precision, low-cost processing. The merits of the planned path will directly affect the machining precision and efficiency of the complex surface parts, which has important significance.This paper reviews the significance of the ultra-precision machining trajectory planning and the latest research at home and abroad at the present stage. Describes several commonly used tool path planning method:iso-parametric method, section method, iso-scallop method, polyhedron method and offset surface method and so on. Meanwhile, based on the expression characteristics of NURBS curves and surfaces and the applications of developed by five-axis machine tool, establish surface models in cylindrical coordinates. And gives the way to determine the main parameters of the nodes of the model.Analysis is made for several common trajectory planning method, considering the optical surface parts, the structure of machine tools and the characteristics of polishing shape, polishing tool offset calculation and posture planning is made by homogeneous coordinate transformation. A novel variant spiral trajectory planning method is proposed, and calculate step length and interval length. Trajectory planning algorithm is given and simulation analysis. Meanwhile, the trajectory planning simulation is composed by vericut software, and the results shows that the proposed variable helical path planning method under the premise of ensuring the quality of the surface being processed, can improve the processing efficiency.