Research On Five-axis CNC Tool Path Planning Based On The Slice With Mian Curvature Matching

Along With the development of national economy and the constant enlargement of the market requirements and the rapid development of production technology lead to the increasment of demands for precision NC machining of more complex shape part. especially with those free-form surface whose curvatures Tremendous changes. The main questions are as follows:If using only one kind of processing method and tool to process surface, then the choice of tool radius can only be determined according to the minimum surface radius, surface processing strategies can only be based on the selection of the most complex areas, which will result in the processing path Extended and repeated cutting, therefore the processing efficiency become low.The choice of tool path also directly affects the machining accuracy, Machining tool path strategies that can solve effectively processing problems of the complex and precise parts have become the core of CNC machining.This paper introduces a new algorithm to generate tool path of free-form surface, which is called as Research on five-axis CNC tool path planning based on the slice with mian curvature matching.First, the method is based on the principal curvatures, Gaussian curvature and mean curvature of the discrete data points and Combined with a method of Z-map point of the range control surface to subdivide surfaces into a number of surface patches families that have been the same or similar information and process characteristics Then, Different processing methods and strategies are applied to those surface patches families, For example, The tool paths that have been generated according to isoparametric method should be used for processing flat surfaces whose curvature change slowly.And The tool paths that have been generated according to isoscallop method should be used for processing steep surfaces whose curvature change violently, Those take the advantages of the existing tool path method to improve the efficiency of surface machiningAccording to this algorithm, parametric line method is adopted when the curvature value of the surface is flat on the processing domain, and adopting a flat tool whose radius is big to generate the tool trajectories by the way of milling Trajectory scallop height method is adopted when the curvature value of surface is big change on the surface domain, and adopting a ring tool whose radius is small to generate the tool paths by the way of millingFor all of these cases, system based on VC++ soft to program and develop the algorithm, and the tool paths that have been generated according to the proposed method have been calculated and showed through the MATLAB platform. Comparing those trajectories than the paths that have been generated by CimatronE.The result of the comparison show that surface processing efficiency and quality are improved...