AZ31/AA5083雙金屬筒形件氣壓脹形-冷縮結合工藝

AZ31/AA5083雙金屬筒形件氣壓脹形-冷縮結合工藝Gas blow forming-cooling contraction bonding process of AZ31/AA5083 bimetallic cylinder

通過氣壓脹形實驗研究AZ31/AA5083雙金屬筒形件氣壓脹形-冷縮結合工藝的基本成形規律。結果表明：雙金屬筒形件的適宜成形溫度為450 ℃左右，雙金屬筒形件因兩種金屬熱膨脹系數不同而收縮不同，在筒間形成過盈配合，筒間殘余接觸應力取決于雙金屬收縮量的差異，計算出筒間殘余接觸應力為2.96 MPa，接觸應力過大會導致底部失穩凸起；同時，給出筒底凸起失穩發生的判據。降低成形溫度、增大筒底圓角半徑和保壓冷卻等能夠防止內層筒筒底失穩；內外層筒形件壁厚不均勻，底部圓角處減薄率達到80%，最易發生破裂；加載路徑對壁厚分布幾乎沒有影響。

The forming behavior of gas blow forming-cooling contraction bonding of AZ31/AA5083 bimetal cylinder was researched by gas blow forming tests. The experimental results show that the optimum temperature is about 450 ℃. The residual contact stress between bimetallic cylindrical components results from interference fit and is about 2.96 MPa. The excessive contact stress can lead to instability at the bottom of inner cylindrical component and the corresponding instability criterion is proposed. Decreasing forming temperature, increasing the round corner radius of bottom and cooling with the gas pressure can avoid the instability. The wall thickness distribution of internal and external cylinders is non-uniform and the thickness thinning rate of corners on the bottom reaches up to 80% and thus this location is the most vulnerable to rupture. With the same initial pressure and the maximum pressure, the loading path has no effect on the wall thickness distribution.

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