基于工艺系统刚度的加工误差分析  

Machining errors analysis based on stiffness of workpiece-fixture system

作　　者：张发平[1] 孙厚芳[1] 左昕[1] 巩威[1] 

机构地区：[1]北京理工大学机械及车辆工程学院,北京100081

出　　处：《组合机床与自动化加工技术》2004年第5期83-85,共3页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国防科学技术工业委员会预研项目 (41 31 8.1 3 .1 )

摘　　要：在切削加工过程中 ,工件和刀具正确的相对位置是保证零件加工精度的必要条件。工艺系统刚度及精度是影响工件、刀具位置的关键因素。因此研究工艺系统刚度 ,对提高零件的加工精度具有十分重要的意义。文章基于切削加工中工件的准静态受力分析 ,运用经典Hertz接触理论和有限元的方法 ,提出计算工艺系统刚度的新方法。该方法避免了有限元计算中接触单元的使用 ,无需多次非线形迭代计算。给出了基于工艺系统刚度的工件加工误差预报模型。During machining process, it is essential to insure the workpiece machining precision by providing the correct relative position between the cutting tool and workpiece, to which the stiffness of workpiece-fixture system contributes a lot. So it is very important to study the stiffness. Based on the quasi static force analysis, the paper gives the new method to compute the stiffness workpiece-fixture system by means of classic Hertz theory and FEM. By this way the contact analysis in FEM is avoided and calculation time is shortened. And also the workpiece machining errors predictive model is provided.

关 键 词：工艺系统 刚度 有限元 加工误差 切削加工 加工精度 

分 类 号：TH161[机械工程—机械制造及自动化]