基于响应面法的柔性钻削加工机床的整机结构优化

The Whole Machine Structure Optimization of Flexible Drilling Machine Tool Based on Response Surface Method

柔性钻削加工机床的整机静动刚度对保证其加工精度至关重要,为提高柔性钻削加工机床的整机综合性能,建立整机的有限元模型进行静动态特性分析,选取主要部件的关键尺寸为设计变量,基于响应面法和多目标尺寸参数优化方法确定整机的结构优化方案,利用LMS动态测试系统完成整机的模态参数识别。研究结果表明:优化设计后,机床整机质量减少7.2%,最大变形量减小了23.1%,一阶固有频率增加33.6%。整机的静动刚度均有不同幅度提升,研究结果对提升整机的综合性能具有一定的指导意义。

The static and dynamic stiffness of the flexible drilling machine tool is very important to ensure its machining accu⁃racy.In order to improve the overall performance of the flexible drilling machine tool,finite element model of the complete ma⁃chine was established to analyze the static and dynamic characteristics,select the key dimensions of the main components as de⁃sign variables,and determine the structural optimization plan of the whole machine based on the response surface method and the multi-objective size parameter optimization method,use LMS dynamic test system to complete the modal parameter identification of the whole machine.The research results show that after the optimized design,the mass of the machine tool is reduced by 7.2%,the maximum deformation is reduced by 23.1%,and the first-order natural frequency is increased by 33.6%.The static and dy⁃namic stiffness of the whole machine has been improved in different ranges,and the research results have certain guiding signifi⁃cance for improving the overall performance of the whole machine.