工艺参数对分流宽展挤压空心镁合金壁板挤压力的影响  

Effect of Process Parameters on Extrusion Force of Hollow Magnesium Alloy Wallboard Extruded by Shunt Wide Spreading Extrusion

作　　者：石磊[1] 柳翊 安俊超 张伟[1] SHI Lei;LIU Yi;AN Junchao;ZHANG Wei(School of Material Science & Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China)

机构地区：[1]洛阳理工学院材料科学与工程学院,河南洛阳471023

出　　处：《热加工工艺》2019年第1期125-128,133,共5页Hot Working Technology

基　　金：中国博士后面上基金项目(2016M602238);河南省高等学校重点科研基金项目(17A430025);河南省科技攻关项目(172102210403);2016洛阳理工学院科研预研基金项目(2016YZY05)

摘　　要：通过有限元法对大型镁合金空心壁板的挤压过程进行了仿真,获得了挤压成形过程中的挤压力,研究了不同模具结构和工艺参数的挤压力-行程曲线。结果表明,挤压载荷在到达峰值之前有三个阶段,分别对应于分流、宽展和挤出过程;挤压比λ、挤压速度v、初始坯料温度T_0、通道转角角度α和焊合腔纵向深度d对挤压载荷的影响显著性顺序为:λ>v>T_0>α>d。根据挤压力峰值确定的合理工艺参数范围为:λ≤14,α=145°～155°,d≤240mm,T0≥440℃,v<5 mm/s。The extrusion process of large magnesium alloy hollow wallboard was simulated by finite element method.The extrusion force in the extrusion process was obtained. The extrusion pressure-stroke curves of different die structures and process parameters were studied. The results show that there are 3 stages before the peak value of extrusion load,corresponding to shunting, expanding and extrusion, respectively. The significant sequence affecting extrusion load are extrusion ratio λ, extrusion speed v, initial blank temperature T0, channel angle α and longitudinal depth d of welding cavity,or λ>v>T0>α>d. According to the peak value of extrusion pressure, the reasonable range of process parameters are:λ≤14, α=145°~155°, d≤240mm, T0≥440℃ and v<5 mm/s.

关 键 词：空心壁板 镁合金 挤压力 分流宽展挤压 

分 类 号：TG376.2[金属学及工艺—金属压力加工]