基于几何精度与定位法线的工件自由度判定方法及应用  

Analysis Method and Application of Workpiece Degree of Freedom Based on Geometric Accuracy and Location Normal

作　　者：王友利[1] 张铎 刘佩杰 马国红 王晓慧[1] Wang Youli;Zhang Duo;Liu Peijie;Ma Guohong;Wang Xiaohui

机构地区：[1]太原科技大学机械工程学院,太原市030024

出　　处：《工具技术》2023年第10期144-149,共6页Tool Engineering

基　　金：国家自然科学基金(51975395);山西省面上青年基金项目(201901D211289);山西省基础研究计划(202103021223285)。

摘　　要：为判断机床夹具设计中工件的定位状态,以建立工件工序需求自由度与工件定位判定自由度相统一的数学模型为目标,从零件几何精度的标注模式出发,以工件定位法线数量及其几何关系的几何定理为理论依据,分别建立工件几何精度的标注自由度模型和工件定位自由度模型,基于上述两自由度模型建立工件定位状态判别规则判断工件定位合理性。以某加工工件为实例,介绍工件标注自由度模型及定位自由度模型的建立过程和工件定位状态的判定。该方法实现了自由度从工序需求到定位判定的统一,为计算机辅助夹具设计中自由度的判定建立基础。In order to judge the positioning state of workpiece in machine tool fixture design,aiming at establishing the unified mathematical model of the workpiece freedom degree of process demand and the workpiece positioning judgment freedom degree,starting from the marking mode of part geometric accuracy,and taking the geometric theorem of workpiece positioning normal number and its geometric relationship as the theoretical basis.The marking degree of freedom model of workpiece geometric accuracy and workpiece positioning degree of freedom model are established respectively based on the above two degrees of freedom.The judgment rules of workpiece positioning state are established to judge the rationality of workpiece positioning.A machining workpiece is taken as an example,the establishment process of workpiece marking degree of freedom model and positioning degree of freedom model and the determination of workpiece positioning state are introduced.The unity of process requirements to positioning judgement freedom degrees is realized and the basis for the judgement of freedom degrees in computer with aided fixture design is established by using this method.

关 键 词：标注模式 几何精度 定位法线 自由度模型 判别规则 

分 类 号：TG75[金属学及工艺—刀具与模具] TH161[机械工程—机械制造及自动化]