Research On Design And NC Machining Of Impeller By Using Reverse Engineering

The reverse engineering and its key technique of complex impeller' s surface are researched an explored in this paper, including data measuring , and data processing, and surface reconstruction, and numerical control machining program. The mostly harvest sa following:1. Automation measuring mode and automation programming mode of three-CMM whichi is the common measure tool in reverse engineering are compared. By scanning measure the surface of impeller vane, The concreting step and method of automation measuring are discussed. A new method of establish abnormal shape part's measure reference frame is put forward, using impeller vane's boundary. The best measuring surface layout along creating line is explored. This layout can increase efficiency of scanning measure and decrease scanning data point.2. The conception and theory of data processing in reverse engineering are discussed. By processing scanning data the surface of impeller vane, a 3D boundary method that can eliminate yawp points speedily is explored. The method eliminstes yawp points speedily outside 3D boundary as well as keeps the real points inside 3D boundary, and improves efficiency of eliminating yawp points.3. The basic theory and method of surface reconstruction are discussed. The process of surface reconstruction of "cloud" data by UG NX2 software is explored. First, to creat scanning lines; second to order scanning lines; third to trim surface by a plane; last to adjoin some surfaces, it is a short cut of surface reconstruction. The method that high precision NURBS surface is reconstructed by 3D boundary is studied out. It makes surface reconstruction conveniently...