稀土镁合金薄腹高筋支架的等温锻造技术  

Isothermal forging rare element containing magnesium alloy bracket with thin web and high rib

作　　者：徐文臣[1] 单德彬[1] 郭斌[1] 韩修柱[1] 黄晓磊[1] 王悦[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《塑性工程学报》2014年第2期7-12,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51275128)

摘　　要：针对Mg-9Gd-3Y-0.6Zn-0.5Zr合金薄腹高筋支架构件,设计其等温锻造成形方案和模具装置。采用有限元软件DEFORM-3D对薄腹高筋支架等温成形过程进行有限元模拟和实验,分析模具结构和成形方案对成形过程中金属流动充填的影响规律,揭示缺陷产生原因,并进行工艺优化,最终成形出质量良好的锻件。结果表明,采用分瓣模具结构和等温成形技术,可整体一次性精密成形形状复杂的薄腹非对称高圆弧筋类锻件,且构件组织细小均匀;通过设置工艺圆角和增加活动阻尼块的方式,可有效控制薄腹高筋支架圆弧筋处金属的流动充填阻力,消除圆弧筋抽料和侧耳充不满缺陷。Isothermal forging schemes and die devices were designed to precisely form Mg-9Gd-3Y-0.6Zn-0.5Zr alloy brackets with thin web and high rib . The isothermal process of the thin-web high-rib bracket was studied via FE simulation and forging ex-periments . The influence of the die structure and the forming scheme on the metal flow and the filling was analyzed , and the mechanism of the defect formation was revealed . Finally , the bracket forging was well formed through optimizing the forging process . The results show that complex-shaped forgings with thin web and high asymmetric arc rib were precisely forged in one pass by split die scheme and isothermal forging process ,and the microstructures were uniformly refined .The metal filling resist-ance in the die cavity of the arc rib of the bracket was effectively controlled by optimizing corner radius and adding active damping block , thus avoiding the defects of arc rib notch and lateral ear underfilling .

关 键 词：Mg-9Gd-3Y-0 6Zn-0 5ZR合金 薄腹高筋支架 等温锻造 活动阻尼块 

分 类 号：TG306[金属学及工艺—金属压力加工]