机械振动对A356合金充型能力影响的研究  

Experimental investigation of the effect of mechanical vibration on the filling ability of A356 aluminum alloy

作　　者：赵建华[1,2] 马强[1] 金通[1] 代雪佳[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030 [2]重庆大学国家镁合金材料工程技术研究中心,重庆400030

出　　处：《功能材料》2014年第15期15129-15133,共5页Journal of Functional Materials

基　　金：重庆市科技攻关计划资助项目(2008AA4029)

摘　　要：将机械振动应用于 A356合金浇注过程中,测量不同振动频率下合金的充型长度,通过多项式回归,建立充型长度与振动频率之间的数学表达式,来探索机械振动对合金充型能力的影响机理.实验结果表明,在 A356铝合金充型过程中进行机械振动,使流动阻力减小,晶粒细化,改善了金属液充型能力,而使界面换热系数增加,阻碍了充性,因此振动频率对充型能力的影响不是单调的,振动在20~50 Hz 之间存在一个频率,使 A356铝合金的充型能力达到极大值,为35 Hz,经过回归分析得出极大值点为＝39．05 Hz, max＝823．89 mm.Mechanical vibration was applied to A356 alloy filling process,the filling length of the alloy was meas-ured under different vibration frequency,the mathematical expression between the filling length and vibration frequency was set up by polynomial regression to explore the effect mechanism of mechanical vibration on alloy filling ability.The result indicates that in filling process of the A356 alloy,the flow resistance was reduced and grains were refined to improve the filling ability of liquid metal while the heat transfer coefficient was increased to make the filling ability of liquid metal reduce.So the effect of mechanical vibration on the filling ability was not monotonic,and it has a vibration frequency that make the A356 alloy filling ability reaches a maximum val-ue among 20-50 Hz,and =39.05 Hz, max=823.89 mm was maxima through regression analysis.

关 键 词：充型能力 机械振动 A356合金 多项式回归 

分 类 号：TG27[金属学及工艺—铸造]