發(fā)布時間：2018-05-09 06:10

  本文選題：鋁合金 + 流變壓鑄　； 參考：《稀有金屬》2017年11期

【摘要】：7075鋁合金強度接近鋼鐵,被認為是實現(xiàn)以鋁代鋼的首選材料,在汽車輕量化中發(fā)揮的作用越來越大。但是該合金鑄造過程極易產(chǎn)生組織與成分不均勻等缺陷,采用普通鑄造方法很難成形完好的鑄件。開展了7075鋁合金螺旋電磁攪拌制漿及流變壓鑄成形工藝研究,實現(xiàn)短流程和低成本。采用數(shù)值模擬和試驗研究相結(jié)合的方法,首先采用Magmasoft軟件對7075鋁合金汽車連桿鑄件的充型和凝固過程進行模擬優(yōu)化,在此基礎(chǔ)上進行了流變壓鑄試驗研究。研究結(jié)果表明現(xiàn)有的計算模型能夠很好地反映7075合金在不同壓鑄參數(shù)條件下的充型和凝固過程,壓射速度3 m·s-1、模具溫度150℃時可以獲得無缺陷的鑄件;用優(yōu)化后的工藝參數(shù)進行7075鋁合金連桿件流變壓鑄和普通壓鑄試驗結(jié)果對比分析:流變壓鑄件顯微組織細小均勻,平均晶粒尺寸為34μm;普通壓鑄件顯微組織粗大不均勻,平均晶粒尺寸為59μm;與普通壓鑄件相比,流變壓鑄件合金元素(Zn,Mg,Cu)的成分偏析小,布氏硬度提高HB 19。
[Abstract]:The strength of 7075 aluminum alloy is close to that of iron and steel, and it is considered to be the preferred material to realize Aluminum-substituted steel, and it plays an increasingly important role in automobile lightweight. However, it is easy to produce defects such as uneven microstructure and composition in the casting process of the alloy, so it is difficult to form the well-formed castings by ordinary casting methods. The technology of helical electromagnetic stirring pulping and rheological die casting of 7075 aluminum alloy was studied to realize short process and low cost. By using the method of numerical simulation and experimental study, the mold filling and solidification process of 7075 aluminum alloy automobile connecting rod castings were simulated and optimized by Magmasoft software, and the rheological die casting test was carried out on this basis. The results show that the existing calculation model can well reflect the filling and solidification process of 7075 alloy under different die-casting parameters. The casting without defects can be obtained at the injection rate of 3ms-1 and the temperature of the die at 150 鈩，

本文編號：1864904