不同快压射速度对镁合金真空压铸件成形质量的影响
Influence of Different Rapid Injection Velocity on Forming Quality of Magnesium Alloy Vacuum Die Casting
陈思涛 1宋东福 2戚文军 2周峰1
作者信息
- 1. 佛山职业技术学院智能制造学院,佛山 528137
- 2. 广东省科学院新材料研究所,广州 510640
- 折叠
摘要
以AZ91D镁合金为研究对象,采用自主设计的真空抽气系统进行3组真空压铸试验,研究不同快压射速度对真空压铸件力学性能及组织的影响.结果表明,该真空抽气系统制得的压铸件外形完整,力学性能优于普通压铸件.当快压射速度为3 m/s时,压铸件表面容易形成冷隔和流痕且内部组织存在多处缩松、缩孔;当快压射速度为5 m/s时,压铸件则容易出现飞边且内部组织存在多处缩孔;当快压射速度为4 m/s时,压铸件外形完整且内部只有少许缩孔,此时散热片的抗拉强度为226 MPa,伸长率为5.4%.
Abstract
Three groups of vacuum die-casting experiments for AZ91D magnesium alloy were carried out with a self-designed vacuum pumping system to investigate the effects of different rapid injection speeds on the mechanical proper-ties and microstructure of vacuum die-casting parts.The results indicate that the die castings fabricated by the vacuum pumping system exhibit complete shape and the better mechanical properties than ordinary die castings.When the rapid injection speed is 3 m/s,the surface of the die castings is easy to form cold shut and flow marks,and there are many shrinkage porosity and holes in the microstructure.When the rapid injection speed is 5 m/s,the die castings are prone to flash and there are many shrinkage holes in the microstructure.When the rapid injection speed is 4 m/s,the die-castings have a complete shape with a few shrinkage cavities in the microstructure.The tensile strength and the elonga-tion of the heat sink reach up to 226 MPa and 5.4%,respecively.
关键词
镁合金/工艺参数/真空压铸Key words
Magnesium Alloy/Processing Parameter/Vacuum Die Casting引用本文复制引用
基金项目
广东省高校青年创新人才资助项目(2020KQNCX210)
广东省自然科学基金资助项目(2018A030313287)
出版年
2024
NETL
NSTL
维普
万方数据