生死单元法分析薄壁件加工变形  

Machining Deformation in Birth-death Element for Thin-walled Workpiece

作　　者：汪振华[1] 袁军堂[1] 刘婷婷[1] 夏亮亮[1] 

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《哈尔滨理工大学学报》2012年第6期81-85,共5页Journal of Harbin University of Science and Technology

基　　金：国家科技重大专项课题(2010ZX04014-051)

摘　　要：针对零件中薄壁结构在机械加工中容易产生变形从而影响其加工精确度和加工质量的情况.对薄壁结构特点进行了分析,建立了有限元分析模型,并采用有限元中生死单元以及移动载荷施加技术实现了对切削加工过程的模拟,得到了典型薄壁结构在不同走刀路径下的加工变形规律,并对典型薄壁结构进行了切削加工实验,进一步验证了有限元分析的正确性.研究结果表明,采用有限元中生死单元技术以及移动载荷施加方法可以模拟材料的切除过程,并且在薄壁加工时,采用两边按一定的背吃刀量进行循环往复的加工方法能够有效控制薄壁的加工变形.According to the case that the deformation of the thin-walled workpiece,which affects its processing precision and processing quality,is easy to appear in machining,we analyzed the characteristic of the thin-walled structures and established the analysis of finite element model.And,by means of loading increment step and birth-death element techniques,the cutting processes have been simulated and the laws of the machining deformation in different kinds of tool-path have been discovered.Finally,the analysis of finite element is further verified by the machining experiment of the typical thin-walled structures.The study has revealed that the means of loading increment step and birth-death element techniques can be used for simulating the cutting processes of materials,and the adopted method of cutting both sides of thin-walled workpiece at the same time,based on reversal load pattern,can effectively control the cutting deformation of the thin-walled workpiece.

关 键 词：生死单元 薄壁 加工变形 有限元 

分 类 号：TH16[机械工程—机械制造及自动化] TB1[一般工业技术]