NC Programming And Simulation Verification Of Five-axis NC EDM Of The Integral Turbine Blisk

The integral turbine blisk is a new type structural part of high performance aerospace engines. It has complicated structure and is machined by advanced processing technology using new intractable material. The processing of integral turbine blisk has been a key technology restricting manufacture of aerospace engines. At present, multi-axis NC electrical discharge machining(EDM) is considered to be the most competitive processing technology at home and abroad.This thesis describes parametric modeling method of the integral turbine blisk, design and optimization method of the shaped electrode. The reverse search algorithm is discussed for the complicated feed path search problem in the process of five-axis NC EDM of integral turbine blisk. The reverse trajectory is sought by moving and rotating the shaped electrode and adjusting thickness of the shaped electrode. Based on compressed voxel model, a new simulation and verification method of five-axis NC electrical discharge machining (EDM) of integral turbine blisk is discussed. Compressed voxel model of the integral turbine blisk and the shaped electrode are built. Swept volume of the shaped electrode is modeled. Three-dimensional dynamic simulation of the machining process is accomplished. Marching Cubes algorithm is applied to build the triangle mesh model of machined workpiece which can be observed in real time from any direction. The machined workpiece is verified through error analysis with the CAD model of integral turbine blisk.Above methods has been successfully applied to five-axis NC machining of the integral turbine blisk, which achieved excellent effect.