中文摘要：

立柱是机床加工中心的关键部件，其结构形式对机床的加工精度有很大影响．以提高立柱动态性能为目的，考虑加工中心的动静刚度性能要求，提出立柱的优化设计方案，建立优化设计模型．首先采用HyperMesh的优化模块Optistruct对立柱进行拓扑优化，得到高性能的拓扑形式，然后考虑可加工性将立柱简化为筋板结构，并在此基础上利用遗传算法结合ANSYS的APDL编程语言进行进一步的详细设计．相比原始设计方案，立柱的动态刚度有了明显的提高，表明给出的方法对机床的结构设计有指导意义．

英文摘要：

As a key component of machining center, the structural design of pillar impacts the me- chanical properties and precision significantly. Aiming to improve the dynamic property of pillar and considering the performance requirements for static and dynamic stiffness of machining center, this article proposed optimal design scheme of pillar structure and gave the optimization model. The pillar was conducted topology optimization in Altair OptiStruct to achieve topology struc- ture with high performance. Considering machinability, the pillar was simplified to be stiffened panel structure. Based on it, detailed design was obtained by combining genetic algorithm with APDL of ANSYS. Compared with original design, the pillar＇s dynamic stiffness has increased considerably, which shows the presented methods can provide theoretical guidance to structural design of the machining center.