推压-拉拔复合缩径成形理论解析  

Theoretical analysis of pushing-pulling necking forming

作　　者：刘超 吴娜[1,2] 杨志安 LIU Chao;WU Na;YANG Zhi-an(Department of Transportation and Vechicle Engineering,Tangshan University,Tangshan 063000,China;Key Laboratory of Intelligent Equipment Digital Design and Process Simulation of Hebei Province,Tangshan University,Tangshan 063000,China;Tangshan Yate Special Vehicle Co.,Ltd.,Tangshan 063000,China)

机构地区：[1]唐山学院交通与车辆工程系,河北唐山063000 [2]唐山学院河北省智能装备数字化设计及过程仿真重点实验室,河北唐山063000 [3]唐山亚特专用汽车有限公司,河北唐山063000

出　　处：《塑性工程学报》2021年第10期199-205,共7页Journal of Plasticity Engineering

基　　金：河北省高等学校科学技术研究项目(QN2019335);唐山学院博创基金资助项目(1401906,1401903);河北省特种运载装备重点实验室开放基金资助项目。

摘　　要：对推压-拉拔复合缩径管坯各变形区域进行了变形分析,采用主应力法对经向应力进行了解析,依次推导出弹性变形区、壁厚减薄区和定径区的经向应力表达式。以凹模出口处管坯的经向应力为边界条件,向管坯中部依次递推,得到变形管坯的经向应力表达式,并以某载重6.5 t胀压成形汽车桥壳管件缩径工艺为例,进行了3种不同芯轴外径的试验,对比了试验和计算结果。结果显示,经向应力试验值的变化趋势与计算结果一致,同时预测出缩径管件发生失稳现象,验证了理论计算的正确性。The deformation analysis in each deformation zone of the tube blank pushing-pulling necking was carried out.The necking stress was analyzed using slab method,and the expressions of radial stress in elastic deformation zone,wall thickness reduction zone and straightening zone were deduced.Taking the meridional stress of the tube blank at the outlet of die as the boundary condition,the necking stress expression of the deformed tube blank was obtained by recursion to the middle of the tube blank.Taking the necking process of a 6.5 t automobile axle housing tube as an example,the tests were carried out with three different mandrel outer diameters,and the test and calculation results were compared.The results show that the change trend of the tested necking stress is consistent with the calculation results.At the same time,the instability of the necking tube is predicted,which verifies the correctness of the theoretical calculation.

关 键 词：推压-拉拔复合缩径 主应力法 经向应力 屈服失稳 

分 类 号：TG316[金属学及工艺—金属压力加工]