CAJ | 학술논문

将自主研发的强制对流搅拌制浆装置(FCM)与压铸机结合,以汽车控制臂为例,成功实现 A380 铝合金的流变压铸成形.研究FCM工艺参数下铸件组织特征的演变,对比传统压铸与FCM流变压铸工艺下铸件显微组织、内部缺陷和力学性能的差异,分析 FCM 流变压铸工艺组织形成机理及其凝固行为.结果表明:适当提高螺杆转速或降低内筒温度,均有利于改善铸件的组织形态;FCM流变压铸工艺不仅可以获得内部组织细小、圆整且分布均匀的铸件,而且可以显著减少铸件内部气孔缺陷和提高铸件的力学性能.和传统压铸件相比,FCM流变压铸件的抗拉强度、屈服强度和伸长率分别提高了10%、4%和140%.
장자주연발적강제대류교반제장장치(FCM)여압주궤결합,이기차공제비위례,성공실현 A380 려합금적류변압주성형.연구FCM공예삼수하주건조직특정적연변,대비전통압주여FCM류변압주공예하주건현미조직、내부결함화역학성능적차이,분석 FCM 류변압주공예조직형성궤리급기응고행위.결과표명:괄당제고라간전속혹강저내통온도,균유리우개선주건적조직형태;FCM류변압주공예불부가이획득내부조직세소、원정차분포균균적주건,이차가이현저감소주건내부기공결함화제고주건적역학성능.화전통압주건상비,FCM류변압주건적항랍강도、굴복강도화신장솔분별제고료10%、4%화140%.
Taking auto control arms for example, the rheo-diecasting process of A380 alloy was obtained by combing a self-developed forced convection mixing rheoforming machine (FCM) with a diecasting machine. The microstructural characteristics of FCM rheo-diecasting parts in various processing parameters were investigated. The differences of microstructures, internal defects and mechanical properties in traditional diecasting parts and rheo-diecasting parts were compared. The formation mechanism and solidification behavior of semisolid slurry were analyzed in FCM rheo-diecasting process. The results show that raising rotation speed or decreasing barrel temperature appropriately is beneficial to optimize the microstructure of rheo-diecasting parts. The process not only can get parts with fine, spherical and uniformly distributed primary α(Al) particles, but also is able to increase mechanical properties and decrease pore defects of parts evidently. Compared with traditional diecasting, the tensile strength, yield strength and elongation of FCM rheo-diecasting parts are increased by 10%, 4% and 140%, espectively.