FRP制件修复用在位加工铣床的床身优化

Optimization Design of In⁃place⁃machining Tool Bed for FRPs Bonded Repair

内补片胶接技术是一种修复FRP制件缺陷、损伤的常用方法。工程中急需一种该方法中内凹阶梯结构的在位加工机床。此类薄壁弱刚性制件受压易变形。因此,对该机床床身进行轻量化设计,以减小受压变形对加工质量的影响。以某型在位加工机床原型机环形BFPC床身为研究对象,首先基于原型机工况分析,明确了床身的综合性能指标;采用拓扑优化技术,获得了最优拓扑的床身结构;进而,通过规则化结构参数,并设计正交实验,辨识了机床质量及综合性能的主要影响因素;最后,建立了以规则化结构参数为变量,床身质量及振幅最小为目标的多目标优化函数,获得了最优拓扑和最优性能的床身。

Inward⁃bonded Patch technology is a common method to repair Fiber Reinforce Plastics(FRPs)parts with the defect and damage.There is an urgent need for an in⁃place machining tool in the machining of concave step structure.Such thin⁃walled weakly rigid parts are easily deformed under the pressure.Therefore,the lightweight design of the machine bed to reduce the influence of the compression deformation on the machining quality.A ringed basalt fiber polymer composite(BFPC)bed of the prototype machine tool is taken as the research object.Firstly,the comprehensive performance of the bed under the working condition is defined based on the analysis via finite element method.Then,the optimal topology results of the bed are obtained by using the topology optimization technique.Furthermore,the main geometrical parameters that affect the mass and the comprehensive performance of the bed are identified based on the regularization of the topological structure and the orthogonal experiment method.Finally,a multi⁃objective optimization function with the regularization structure parameters as variables and the minimum mass of the bed and the minimum amplitude as objectives is established,and the optimal topology and performance are obtained.