关键词: 混联机床, 静刚度, 刚度矩阵, 节点

Abstract:

This paper addressed the static stiffness of a new heavy hybrid machine tool XNZH2430,which was developed in Tsinghua University based on a 2-DOF translational parallel mechanism.In analysis process, the structure of the machine tool can be represented by a number of nodes and elements.The holistic stiffness matrix of the machine tool was built based on the theory of element stiffness matrix.The stiffness distribution of the machine tool within a certain work space was analyzed.The analysis result indicates that the machine tool has better stiffness performance when the moving platform is close to the symmetric position.When the platform is away from the symmetric position,stiffnesses along the y and z directions are turning worse dramatically.Therefore,the moving platform should stay close to the symmetric position during working process.

Key words: hybrid machine tool, static stiffness, stiffness matrix, node