铝合金发动机罩内板充液成形工艺研究

目的研究铝合金发动机罩内板充液拉深-局部关键特征刚性整形复合成形工艺。方法在Dynaform中建立有限元模型,优化液室压力及加载路径等关键工艺参数,并进行试验验证。结果液室压力及加载路径对充液成形零件质量的影响较大,成形所需的最大液室压力为10 MPa,并且液室压力不宜加载过早,当凸模行程在30~40 mm之间时,进行合理的液室压力加载可较好地成形该铝合金内板件。结论对于文中研究的大型多特征铝合金发动机罩内板,采用充液拉深-局部关键特征刚性整形复合成形工艺更有利于其成形,可得到合格零件。

Hydroforming for the Aluminium Alloy Inner Panel of Automotive Engine Hood

To study the compound technology process combining hydroforming and local key features stamping for the aluminium alloy inner panel of automotive engine. The finite element model was created in Dynaform. The key process parameters were optimized, such as the cavity pressure and loading paths. Meanwhile, the experiment was done to verify the result of numerical simulations. The cavity pressure and loading paths had great effects on the quality of the part. The needed maximum cavity pressure was 10 MPa. And the cavity pressure should not be loaded prematurely. The aluminium alloy inner panel part could be better formed through loading the reasonable cavity pressure when the punch stroke was among the 30~40 mm. For the large multi-feature aluminium alloy inner panel of automotive engine researched in this paper, the adopted compound technology process combining hydroforming and local key features stamping was more benefit for its forming. The qualified part could be obtained.