Study Of Reverse Design And Five Axis Machining Technology For Impeller Based On Geomagic And UG

As one of the three major parts of the turbine engine,Impeller is a typically complex surface parts.One side,the establishment of free and complex curved surface model is very difficult to design.The other,it is also required by the five axis machining technology to manufacture.In this paper,the acquisition and processing,model reconstruction,redesign,five axis machining technology and orthogonal test optimization cutting parameter of the point cloud data of the impeller are studied and demonstrated.This paper studied these two issues.In the design aspect,The target of this paper is the reconstruction of free complex curved surface of integral impeller by reverse engineering technology.The point cloud data is acquired through win3 dd 3D scanner.The physical characteristics of the impeller is transformed to the point cloud data.Then used point cloud data processing software Geomagic Studio to obtain and deal with the point cloud data of the impeller,and convert the data to accurate 3D digital model of surface.Then reconstructed the model of the impeller based on the reverse engineering software Geomagic DesignX.It also introduces the application of reverse engineering in the design of impeller model.The reconstructed impeller is redesigned through the CAD software,which can reflect the essence of reverse engineering in innovative design.In manufacturing,the milling process of impeller is achieved by using the 5 axis programming method.Combined with the integral impeller processing module of UG(NX)10.0 software(MILL_MULTI_BLADE),this paper creates some working procedures for performing impeller rough machining,finish machining and finish machining of blade wheel and blade root fillet finishing processing as well as the design of five-axis NC machining programming of integral impeller to realize the five-axis NC machining programming of impeller.Combined with the cutting parameters of orthogonal experiment,to modify the cutting parameters of the experimental machining blades and simulate machining of impeller with the machine tool model in the UG software,finally in the five axis machining center,the impeller will be examined and verified through test cutting.In this paper,the optimized cutting parameters under orthogonal experiment has also been studied.The orthogonal experiment is designed in the study,and the orthogonal table is established.The surface roughness value which is measured in the verification of test cutting is inputted to the orthogonal table,and the deviation value Kjm and range value Rj of each factor at each level are calculated by the range calculation method in the orthogonal experiment.Based on what has acquired above,the influence degree of each factor on the experimental output and the primary and secondary relationship are studied,combined with a set of more optimal cutting parameters.Finally,the illustrative diagram that shows the influence of the cutting parameters on the curved surface quality of the impeller is established to is analyze the change scope about influence of different cutting parameters on the surface roughness of the impeller.