分流组合模在挤压多孔薄壁铝型材过程中的应力分析  

Stress analysis of the porthole die for multi-holed and thin-walled aluminum profiles extrusion

作　　者：程磊[1] 谢水生[1] 黄国杰[1] 和优锋[1] 付垚[1] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088

出　　处：《材料研究与应用》2011年第3期198-202,共5页Materials Research and Application

基　　金："973"项目(2010CB735811);"十一五"国家科技支撑计划(2007BAE38B04)

摘　　要：采用弹性有限元模拟的方法,建立了分流组合模在挤压空心铝型材过程中的应力计算模型,以典型的多孔薄壁口琴管型材为研究对象,对分流组合模具在挤压型材过程中的应力及弹性变形进行了分析.结果表明:分流组合模上模的应力分布极其不均,模芯根部有明显的应力集中,易产生裂纹,使模具过早失效;模芯和模孔部位的弹性变形会使挤出的型材制品尺寸产生偏差,在设计分流组合模具时应考虑尺寸补偿.The porthole die for extruding an aluminum harmonica-shaped tube was investigated. Stress analytical model of porthole die was established by numerical simulation method. The effective stress and elastic deformation distribution of die during the porthole die extrusion process were calculated. The results show that the stress distribution of the porthole die is very uneven. The stress concentration is rather severe in bridge position of the porthole die, where it is very easy to cracking, leading to the die early failure. The dimensions of extruded profile will change because of the elastic deformation of mandrel. Therefore, the dimension compensation should be considered into structure design of the porthole die.

关 键 词：空心铝型材 分流模 模具应力 数值模拟 

分 类 号：TG376[金属学及工艺—金属压力加工]