基于有限元的140 kN摩擦焊机主轴箱响应面优化分析

以140 kN连续驱动摩擦焊机主轴箱为研究对象,应用有限元分析软件对主轴箱进行了静、动态相关特性的分析。为提高主轴箱综合力学性能,并实现主轴箱箱体材料的合理利用,以箱体壁厚等7个结构参数为设计变量进行了中心复合实验设计。根据得到的数据结果,基于Kriging插值法建立了主轴箱的响应面模型,并对各设计变量进行了灵敏度分析。利用多目标遗传算法完成了主轴箱的优化设计,与原结构方案相比主轴箱箱体减重16.6%,实现了焊机轻量化设计。经过对主轴箱响应面模型拟合精度的校验,验证了CCD实验法与Kriging插值法相结合可高效精准地完成主轴箱响应面模型的建立。因此这一优化方法同样适用于其他类型的机床零部件的设计。

Optimization Analysis of Response Surface of 140 kN Friction Welding Machine Headbox Based on Finite Element

Taking the headstock of 140 kN continuous drive friction welder as the research object, the static and dynamic characteristics of the spindle box were analyzed by using the finite element analysis software. In order to improve the comprehensive mechanical properties of the headstock and realize material rational use of the spindle box, the central composite experimental design was carried out with seven structural parameters such as the wall thickness of the box as design variables. According to the obtained data results, the response surface model of the spindle box was established based on Kriging interpolation method, and the sensitivity analysis of each design variable was carried out. The optimization design of the headstock was completed by using multi objective genetic algorithm, the spindle box had a weight reduction of 16.6%, achieving a lightweight design of the welder. After verifying the fitting accuracy of the spindle box response surface model, it was verified that the combination of CCD experiment method and Kriging interpolation method could be used to effectively and accurately complete the establishment of the spindle box response surface model. Therefore, this optimization method can be applied to the design of other types of machine tool parts.