基于iSIGHT的机床整机结构方案设计与集成优化

Schematic Design and Integrated Optimization of Machine Tool Based on iSIGHT

机床整机结构方案设计是机床设计的关键环节.在早期设计阶段,实现整机及基础大件性能优化可显著减少后续详细设计的重复率,提高设计效率.基于多学科优化设计软件i SIGHT,搭建了机床整机结构方案设计及集成优化系统框架,有效集成参数化建模知识、仿真分析知识;综合利用实验设计、响应面拟合及多目标优化算法,形成了以结构件关键设计参数为变量、静动态特性及质量为目标的优化技术流程.以某框中框结构卧式加工中心为例,优化后整机质量下降6.38%,,整机最大变形降低3.24%,,工件-刀具相对变形降低5.68%,,首阶固有频率提高1.15%,.优化结果验证了所提出方法的可行性.

Schematic design of structure plays a key role in machine tool design.To realize the performance optimiza-tion of whole machine and structural components in the early design stage can avoid repetition rate in subsequent de-tailed design and structural modification,and therefore improve design efficiency.Based on multidisciplinary opti-mization software iSIGHT,the framework of schematic design and integrated optimization system for machine tool was constructed,through which the knowledge of parametric modeling and simulation was effectively inte-grated.Experimental design,response surface methodology（RSM）and multi-objective optimization algorithm were applied synthetically to optimize the whole machine structure and structural components.An optimizing technical process with static ＆ dynamic characteristics and massas the goal was formed which took the key structure design parameters as variables.Schematic design and optimization of a horizontal machining center with a box-in-box archi-tecture were conducted to verify the proposed method.The results show that the maximum deformation of machine tool is reduced by 3.24%,,the relative deformation between the workpiece and the cutter is reduced by 5.68%,and the first natural frequency is increased by 1.15%, while the overall mass of machine tool is reduced by 6.38%,.