Investigation On Five-axis Processing Technology Of Complex Surface

Complex surface parts are widely used in molds,turbine blades etc,since these parts are space warp or curvature changed,so the traditional three-axis surface machining technology has been difficult to meet the processing requirements.Five-axis CNC machine tools have two more rotation axises,with greater flexibility to meet the processing requirements,and therefore adapting to the five-axis machine complex surface machining technology research is of important significance.In this paper,regarding complex surface parts as research object,the part surface modeling,processing path computation,post-processing,processing simulation and other related technologies have been studied,and its main contents include:(1)Known the point cloud data of complex surface parts,constructing the point cloud data into complex surfaces based on B-spline surface interpolation theory.Then differential geometry knowledge being used gains tangent vector component surfaces,normal vector,curvature,and other related parameters.(2)In order to obtain an efficient complex surface machining path,when calculating single processing path,equal bow error method has been used to get the optimal tool path curved step;when getting another cutting path adjacent,equal residual height method has been utilizated to get the maximum path interval within the processing error;repeat these steps can get the entire machining path of the complex surface.At last cutting contact path is converted into cutting location path.(3)Post-processing coordinate conversion algorithm is derived for double rotary CNC milling machine,and the feed speed of five-axis machine is calculated.The post-processing program is written in Visual C ++,converting cutter location file into CNC code.(4)Five-axis CNC machine simulation environment is established in VERICUT software.The same part is processed by UG and local method,and comparing cutting path length of these two methods.Then the post-processed cutter location file imports into VERICUT to simulate processing and processing errors is evaluated.Finally,the constant machine feed speed and constant tool center speed is comprised to examine the difference of the proposed method and these five-axis processing parameters are provided to be reference.