Integrated stiffness characteristics of machine tool, cutters in various postures and distribution of impeller blade will affect the machining system in processing impeller with complex and thin-wall sculpture surface, and have further effect on machining accuracy of blade. Base on the theories of multi-body small deformation, the point of transfer matrix and the Jacobi matrix, the integrated stiffness model of machining system is established by space force ellipsoid in 3D particular to 5-axis NC machining center. The force ellipsoid method is used to analyze the effect of machine tool joints, cutter and joint of tool holder/cutter on the integrated stiffness field of machining system. And then, the integrated stiffness field distribution of impeller blade in cutting plane is analyzed. Finally, this theoretical model can be effectively optimized path of machining of integral impeller, which is tested by optimization experiments of working table posture.
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