Yan Rong

Closed-loop stiffness modeling and stiffness performance analysis for multi-axis process system

General stiffness performance of manufacturing process system directly affects machining accuracy and stability. When machining complex surface, general stiffness performance changes with tool posture that is determined by machining position and feed direction. In order to analyze general stiffness performance including machine tool, cutter and workpiece, a closed loop stiffness model is established by Jacobi matrix and finite element method. It is a general stiffness model for multi-axis process system, which can be used to evaluate general stiffness performance in workspace. The distribution law of stiffness performance can be evaluated by isoclines map of stiffness index plotted in workpiece coordinate system. The result helps engineers plan tool path based on both geometric and physics constrains.