基于改进遗传算法的自由曲面重建及数控加工  

Free-form Surface Reconstruction Based on Improved Genetic Algorithm and its Numerical Control Machining

作　　者：赵艺兵[1] 温秀兰[2] 张中辉[2] 

机构地区：[1]南京工程学院工业中心,南京211167 [2]南京工程学院自动化学院,南京211167

出　　处：《组合机床与自动化加工技术》2015年第12期109-112,共4页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家自然科学基金项目(51075198);江苏省333高层次人才项目资助(2014-3-45);江苏省六大人才高峰项目资助(2011-ZBZZ-032)

摘　　要：提出了用B样条表示自由曲面,基于改进遗传算法(IGA)重建自由曲面,其中节点矢量由IGA优化得到,控制顶点坐标由最小二乘法根据数据点参数值及由IGA优化得到的节点矢量计算得到。改进遗传算法采用实数编码,选择最小代沟模型和混合交叉策略,算法简单,鲁棒性强。通过对自由曲面零件在坐标测量机实测得到数据采用提出的方法重建曲面并生成CAD模型,根据CAD模型图详细分析了零件加工工艺,完成了自由曲面零件的仿真切削与数控加工,经三坐标测量仪对零件实测并计算自由曲面的轮廓度误差验证了曲面重建及加工方法的正确性、合理性。B-spline is used to express free-form surface parts and an improved genetic algorithm（ IGA） is proposed to reconstruct free-form surface,w here knot vectors are optimized by IGA and the coordinates of control points are calculated by the least square method according to the parameter values of data points and knot vectors optimized by IGA. IGA is based on real-coded and the minimum generation gap model and mix cross strategy are used. It has the advantages of simple algorithm and strong robustness. An actual surface w as reconstructed based on the data of an actual free-form parts measured on coordinate measurement machine. Based the CAD model of the parts,the process technology is analyzed explicitly and the stimulation cutting and numerical control machining of the free-form parts are finished. The surface profile error is calculated by measuring the finished parts on CM M and it verifies that the design and machining methods are correct and reasonable.

关 键 词：自由曲面 B样条 改进遗传算法 数控加工 

分 类 号：TH166[机械工程—机械制造及自动化] TG65[金属学及工艺—金属切削加工及机床]