新型数控刻楦机的误差分析和精度综合  

Error analysis and accuracy synthesis of new numerical control shoe last machine

作　　者：李小雷[1] 童水光[1] 金涛[1] 龚友平[1] 

机构地区：[1]浙江大学化工机械研究所CAD中心,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2006年第6期991-996,共6页Journal of Zhejiang University：Engineering Science

摘　　要：为了提高数控刻楦机加工精度,提出了数控刻楦机加工精度分析与精度综合的新方法.根据数控刻楦机系统特定的树状拓扑结构,利用多刚体系统理论建立了系统空间误差计算模型,通过讨论整个工作空间误差分布规律,找到系统最大误差位置.并对系统最大误差位置进行误差参数灵敏度分析.用蒙特卡洛法进行精度综合.结合误差灵敏度分析,对主要部件的精度进行分配.结果表明,新方法所得到的精度分配方案对最大体积误差小于0.05mm的概率平均值从原方案的0.6592提高到0.7021.结果表明,该方法可以实现复杂多分支运动链系统的误差分析和精度综合,提高系统加工精度.To improve the manufacturing precision of the numerical control shoe last machine, a new errorcomputing method was put forward. Based on the special dendriform topological structure of the numerical control shoe last system and multi-rigid body system theory, a spatial error-calculating model of the system was built. The error distributing law in the whole work space was discussed, and the maximum error position of the system was found. The sensitivities of error parameters were analyzed at the maximum error position, and accuracy synthesis was conducted by using Monte Carlo method. Combined with the error sensitivities analysis, the accuracy of the main parts was distributed. Results show that compared with traditional method, the mean probability obtained by the method is improved from 0. 659 2 to 0. 702 1 with the maximal volume error being less than 0.05 mm. The method can be used for error analysis and accuracy synthesis of the complex multi-embranchment motion chain system, and improve the system precision of manufacturing.

关 键 词：数控刻楦机 多刚体 误差分析 精度综合 

分 类 号：TG502[金属学及工艺—金属切削加工及机床]