基于数值模拟的薄壁管冷弯成形工艺研究  

Study of forming process for thing-walled tube rotary bending based on numerical simulation

作　　者：李思漪[1] 夏琴香[1] 盛湘飞[1] 廖友辉 

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 [2]广东省肇庆市骏驰科技有限公司,广东肇庆526060

出　　处：《锻压技术》2011年第4期163-167,共5页Forging & Stamping Technology

摘　　要：薄壁管冷弯成形过程中最常见的缺陷有管坯内侧失稳起皱、外侧减薄破裂,为获得质量良好的某车用水冷管接头冷弯件,采用数值模拟方法分别研究了芯棒伸出量e、防皱块与管坯间隙c以及芯棒直径d等工艺参数对冷弯成形质量的影响。结果表明:随着芯棒伸出量e增大,管坯外侧壁厚减薄率γ增大,管坯内侧起皱趋势先减小再增大;随着管坯与防皱块的间隙c增大,管坯内侧起皱趋势增大,当间隙较小时外侧减薄率γ变化不大,而当间隙增加到一定数值,外侧减薄率γ明显增加;随着芯棒直径d增加,管坯内侧起皱趋势减弱,外侧减薄率γ增加。Inner wall wrinkle and outer wall thinning are the main defects occurred during thin-walled tube rotary bending.The influence of different processing parameters,such as the mandrel extension length e,the clearance between wiper die and tube c,and the mandrel diameter d on the forming quality were analyzed based on numerical simulation method to avoid the defects during tube rotary bending of automotive water-cooled tube.The results show that the larger the mandrel extension length e,the greater the thickness thinning r of the outer wall of workpiece,and the wrinkling tendency decreases firstly and then increases.With the increasing of the clearance c,wrinkling tendency increases.The variation of thickness thinning γ is less when the clearance c is small,and when the clearance c increases to a certain value,the thickness thinning γ increases significantly.With the increasing of the mandrel diameter d,the wrinkling tendency decreases,and the thickness thinning γ increases.

关 键 词：薄壁管 冷弯成形 起皱 减薄 数值模拟 

分 类 号：TG386-43[金属学及工艺—金属压力加工]