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以AZ91D镁合金建筑刮板为例,将自行开发的锥桶式流变成形机(TBR)与TOYOBD-900V4-T冷室压铸机相结合实现了流变压铸成形工艺过程.研究了不同流变成形工艺下压铸件的组织特征,分析了成形过程中浆料的组织形成机理及凝固行为.结果表明:该流变成形工艺可以获得内部组织细小、初生α-Mg晶粒呈近球形或球形且分布均匀的成形件.当内锥桶转速为700r.min-1时,压铸件内部组织较圆整、均匀,平均晶粒尺寸约45μm,形状因子约0.81.流变压铸过程中合金熔体的凝固主要经历了一次凝固和二次凝固两个阶段.
Taking the AZ91D magnesium alloy construction scraper as an example, the rheological die-casting process was realized by combining the self-developed cone barrel rheology forming machine (TBR) with the TOYOBD-900V4-T cold room die casting machine.The effects of different flow The forming mechanism and the solidification behavior of the slurry during the forming process were analyzed.The results show that the microstructure of the primary α-Mg grains is nearly spherical Or spherical and evenly distributed shaped parts.When the cone speed of 700r.min-1, the internal structure of die-casting parts more round and uniform, with an average grain size of about 45μm, shape factor of about 0.81 during the rheological die-casting process alloy The solidification of the melt mainly undergoes one solidification and two solidification stages.