高、低速切换位置对镁合金压铸件内部孔隙率与力学性能的影响  

Influence of High and Low Speed Switching Position on the Internal Porosity and Mechanical Properties of Magnesium Alloy Die-Casting Parts

作　　者：王嘉诚 付彭怀[1] 陈娟 刘卓铭 冯光明 彭立明[1] Wang Jiacheng;Fu Penghuai;Chen Juan;Liu Zhuoming;Feng Guangming;Peng Liming(School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240;Ningbo L.K.Technology Co.,Ltd.,Ningbo 315042)

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]宁波力劲科技有限公司,宁波315042

出　　处：《汽车工艺与材料》2025年第4期35-39,共5页Automobile Technology & Material

基　　金：国家重点研发计划项目(2021YFB3701000);宁波科技项目(20241ZDYF020400);自然科学基金项目(U21A2048、51821001);上海市科委重点项目(21DZ1208200);广东省重点领域研发计划(2020B010186001);上海市技术合同(2024310031003044);广东省基础与应用基础研究基金(2022B1515120046)。

摘　　要：为提高镁合金压铸件的内部质量与力学性能,对比研究了高、低速切换位置对AE44镁合金压铸件内部孔隙率与力学性能的影响。结果表明:相比于传统将合金熔体达到内浇口时的冲头位置作为高、低速切换位置,将高、低速切换位置适当提前可降低铸件内部的孔隙率并提高力学性能,但高、低速切换位置提前过多会提高孔隙率、降低力学性能;这主要是由于将高、低速切换位置适当提前可减小镁合金在充型过程中熔体温度的降幅,有利于提高镁合金的流动性和模具型腔内残留空气的排出,而高、低速切换位置提前过多,会增加熔体填充型腔时的紊流程度,卷入更多的气体,提高铸件孔隙率。To improve the internal quality and mechanical properties of magnesium alloy die-casting parts,this paper studies the influence of high and low speed switching position on the internal porosity and mechanical properties of AE44 magnesium alloy die-casting parts.The results show that compared with the traditional position of the punch when the alloy liquid reaches the inner gate as the high and low speed switching position,advancing the high and low speed switching position can reduce the porosity inside the casting and improve its mechanical properties.However,advancing the high and low speed switching position too much can actually increase the porosity and decrease the mechanical properties.That is mainly because advancing the high and low speed switching position can reduce the melt temperature drop of magnesium alloy during the filling process,which is beneficial for improving the fluidity of magnesium alloy and the discharge of residual air in the mold cavity.If the high and low speed switching position is advanced too much,it will increase the turbulence level when the melt fills the mold cavity,entrain more gas,and improve the porosity of the casting.

关 键 词：高低速切换位置 镁合金压铸 孔隙率 力学性能 

分 类 号：U465.22[一般工业技术—材料科学与工程] TG249.2[机械工程—车辆工程]