7075铝合金2540mm×550mm规格扁锭铸造工艺研究  

Research on casting process of 2540 mm × 550 mm flat ingots of 7075 aluminum alloy

作　　者：陈仁桂 杨浩 蓝东华[1] 黄金宁[1] 朱玉涛[1] CHEN Ren-gui;YANG Hao;LAN Dong-hua;HUANG Jin-ning;ZHU Yu-tao(Guangxi Alnan Aluminum Inc.,Nanning 530031,China)

机构地区：[1]广西南南铝加工有限公司,广西南宁530031

出　　处：《轻合金加工技术》2020年第1期15-18,31,共5页Light Alloy Fabrication Technology

基　　金：广西创新驱动发展专项资金项目(桂科AA17204012,桂科AA17202007)。

摘　　要：试验研究了大规格7075铝合金扁锭的铸造工艺。结果表明:通过控制Fe、Si元素的含量可以改善铸造裂纹;采用软起铸,当铸造速度为40mm/min^50mm/min、铸造温度为675℃~685℃、冷却水温度为35℃~40℃、冷却水流量为40m^3/h^70m^3/h、结晶器液位高度60mm^100mm的条件下,铸造出表面无皱褶、裂纹、锭尾塌陷和成分均匀、晶粒细小的7075铝合金扁锭。解决了用2540mm×550mm规格的7075铝合金扁锭生产航空货运用成品宽度超过2300mm的宽幅铝板必须横轧的问题,提高了成品率的同时降低了生产成本。The casting process of large-sized flat ingots of 7075 aluminum alloy was studied.The results show that the casting crack can be improved by controlling Fe and Si contents.Starting with mild aluminum in the casting process,the cast ingot of 7075 aluminum alloy has uniform structure and fine grain,without fold,crack or tail collapse,when casting speed,casting temperature,water temperature,water flow rate and melt height in the mold are set as 40 mm/min-50 mm/min,675℃-685℃,35℃-40℃,40 m^3/h-70 m^3/h and 60 mm-100 mm,respectively.It has solved problem that 7075 aluminum alloy ingots of 2540 mm × 550 mm must be cross-rolled in the production of wide-width aluminum plate over 2300 mm for air cargo.It improves the yield and reduces the production cost.

关 键 词：铸造工艺 7075铝合金 大规格扁锭 

分 类 号：TG292[金属学及工艺—铸造]