龙门五轴加工中心薄弱环节的改进设计

Improvement Design of Weak Link of Gantry Five Axis Machining Center

以某型龙门五轴加工中心为研究对象,采用有限元分析的基本理论对整机进行动静态特性分析。建立了有限元模型,并对其进行了3个方向静刚度的对比分析,结合前4阶模态振型找出了影响整机动静态特性的薄弱环节——横梁,在不改变原有横梁结构基础上提出了3种优化方案。结果表明:改进结构3最为合理,并通过静变形量实验验证了改进后结构的正确性,从而提高了整机的动静态特性。

By taking a certain type of gantry five axis machining center as a research object, the basic theory of finite element analysis （FEA） was used to analyze the static and dynamic characteristics of whole machine. The finite element model was established, and its static stiffness in three directions was comparatively analyzed, with the combination of the first four modal vibration shape, the weak link of the whole machine in static characteristics was the beam. On basis of without changing the original beam structure, three kinds of optimization scheme were proposed. The results show that the most reasonable one is the No. 3 improved structure, and the structure of the improved is verified by the static deformation experiment, thereby improves the dynamic and static characteristics of the whole machine.