薄壁轴向微沟槽铜管高速旋压成形的数值模拟  

Numerical Simulation of High-Speed Spinning of Thin-Wall Copper Tube with Axial Micro-Grooves

作　　者：李勇[1] 许泽川[1] 汤勇[1] 曾志新[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2010年第1期128-133,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金-广东省联合基金重点资助项目(U0834002);国家自然科学基金资助项目(50705031;50975096);广东省自然科学基金资助项目(8151064101000058);传热强化与过程节能教育部重点实验室开放基金资助项目(KF0707)

摘　　要：利用有限元分析软件MSC.Marc建立了简化的1/4旋转对称模型,对薄壁轴向微沟槽铜管的钢球高速旋压成形过程进行模拟,并对成形特征和等效应力应变、残余应力的分布规律进行分析.结果表明:成形过程中,金属回弹效应会导致齿根部出现凹口缺陷;等效应力应变及三向应力应变沿轴向呈层状分布,沟槽管外壁面应力超过材料应力极限导致铜屑产生,且易出现断管现象;沟槽底部的等效应力应变和残余应力大于齿顶与外壁面的应力;过大的残余应力容易造成材料脆化,进而产生裂纹等缺陷.In this paper, a simplified 1/4 rotational symmetrical model is built with the aid of finite element software MSC. Marc, and the high-speed steel-ball spinning process of thin-wall copper tube with axial micro-grooves is simulated. Afterwards, the forming characteristics, as well as the distributions of the equivalent stress and strain and of the residual stress, is analyzed. The results show that the metal rebound occurring in the forming process may result in forming gaps at the tooth root, that both the equivalent and the three-direction stress and strain arrange in layers in the axial direction, that the equivalent stress on the exterior wall surface, which is greater than the yield stress of the material, leads to the emergence of copper scale and fracture, that the equivalent stress and strain as well as the residual stress at the groove bottom are larger than those at the tooth tip and those on the exterior wall surface, and that larger residual stress may result in material embrittlement and surface cracks.

关 键 词：轴向微沟槽铜管 钢球旋压 成形特征 应力 应变 有限元分析 

分 类 号：TG306[金属学及工艺—金属压力加工] TG48