Stiffness Analysis and Optimization of Supporting Mechanism Based on Tricept for Thin-walled Part Milling System

摘要

The milling of a thin-walled part easily induces part deflection in the zones of thin walls and floors, where stiffness is not sufficiently high. This problem often leads to inaccuracy of geometry and roughness. This paper proposes a supporting mechanism based on the Tricept parallel mechanism for enhancing the stiffness of the workpiece. To fulfill the requirements of stiffness distribution in the whole work space, redundant actuation is introduced in the mechanism. The inverse kinematic and stiffness model are established. And the position of the branch with redundant actuation is optimized based on the algorithm of self-adaptive differential evolutionary (SaDE). The supporting mechanism presented in the paper has been applied in the thin-walled workpice milling test system, which improved the stiffness distribution of the parts of fuel tank.