转模挤压成形过程的变形机理研究  

Investigation of the mechanism in extrusion process with rotating container

作　　者：李峰[1] 林俊峰[2] 张鑫龙[1] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,哈尔滨150040 [2]哈尔滨工业大学金属精密热加工国家级重点实验室,哈尔滨150001

出　　处：《材料科学与工艺》2011年第5期25-29,共5页Materials Science and Technology

基　　金：黑龙江省博士后科研启动基金资助项目(LBH-Q10065);哈尔滨市青年科技创新人才基金资助项目(2010RFQXG021)

摘　　要：针对低塑性合金挤压成形时所需能耗大、材料利用率低等问题,提出了对凹模施加转动的成形新工艺———转模挤压成形技术,并设计了特殊的凹模结构.与芯模转挤压仅适于圆截面制品相比,对凹模施加转动可有效地避免异型截面制品挤出成形时引起的垂直模口部位轴向的"切断"等难题.数值模拟及理论分析表明:与普通挤压相比,凹模转挤压成形中塑性区范围显著扩大,使成形载荷极值降低了42.1%,且可有效地消除"死区"缺陷.Due to the problem that high energy consumption and low material utilization ratio in extrusion process for lower plastic alloy,this paper proposes a new forming technology,named extrusion with steadily rotating container,and a set of special container is designed.Compared to the extrusion with rotating die,which is only applicable to circular section products,the new forming technology can effectively avoid the axial ＂cutting＂ of vertical die orifice during special-shaped products extrusion forming.The results show that,compared with conventional extrusion,the plastic zone expands significantly in the extrusion with rotating container,and the peak of forming load decreases by 42.1%.

关 键 词：转模挤压 变形机理 低塑性合金 数值模拟 

分 类 号：TG376[金属学及工艺—金属压力加工]