多加强肋胀形可行性补充条件及有限元数值模拟  

Feasibility supplementary criterion and finite element numerical simulation of bulging for multiple reinforcement ribs

作　　者：管爱枝[1] 施于庆[1] 

机构地区：[1]浙江科技学院机械与汽车工程学院,浙江杭州310023

出　　处：《锻压技术》2013年第3期165-169,共5页Forging & Stamping Technology

基　　金：浙江省科技计划重点工业研究项目(2006C21052)

摘　　要：金属板壳件的多加强肋需一次成形,而现有单加强肋胀形可行性条件不能直接用来判断多加强肋能否一次成功胀形。将多加强肋间区域视为反向加强肋,在其许用变形程度比正向加强肋小的前提下,提出了多加强肋胀形可行性的补充条件。建立了单加强肋、近距分布及远距分布多加强肋的3种板壳件模型,运用ANSYS/LS-DYNA完成了其胀形成形的有限元数值模拟。厚度减薄率和成形极限图的模拟结果验证了多加强肋胀形可行性补充条件的有效性。多加强肋之间的距离是决定其能否一次胀形成形的关键因素。Multiple reinforcement ribs of metal shell parts should be made by one bulging procedure, while the current bulging feasibility criterion used for single reinforcement rib can not be directly used to determine whether multiple re- inforcement ribs can be successfully bulged for the first time. After the regions between the positive reinforcement ribs were regarded as reverse reinforcement ribs, a feasibility supplementary criterion of bulging for multiple reinforcement ribs was proposed based on the supposition that the maximum bulging increment of reverse ribs should be smaller than that of positive ribs. Three kinds of metal shell parts were modeled, with single reinforcement rib, multiple ribs with small center distance and multiple ribs with large center distance, respectively. And the numerical simulation of the bulging process for those parts was carried out through ANSYS/LS-DYNA module based on finite element method. The validity of the feasibility supplementary criterion of bulging for multiple reinforcement ribs was verified by the re- sults of thickness thinning rate distribution and forming limit diagram. The center distance between adjacent ribs is the key factor for determining the feasibility of once bulging.

关 键 词：金属板壳件 多加强肋 胀形 数值模拟 有限元法 ANSYS LS-DYNA 

分 类 号：TG386.32[金属学及工艺—金属压力加工]