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铝合金半球形件为航空常见结构件,其特点是零件壁厚较薄、变形量较大,通常采用多工步方法成形。为了提高产品质量和生产效率,提出采用在铝合金坯料表面覆不锈钢的方法进行粘性介质拉深成形。采用有限元软件ANSYS/LS-DYNA对铝合金半球形件覆不锈钢粘性介质拉深成形过程进行了数值模拟,分析压边力和粘性介质压力对成形过程的影响,得到不同压边力加载曲线条件下成形试件壁厚分布、法兰区材料向变形区流入量及粘性介质压力场的变化规律,并进行试验验证。结果表明,在合适变压边力加载曲线条件下,采用覆不锈钢方法进行铝合金半球件粘性介质拉深成形,可以提高铝合金的均匀变形能力,能够直接成形出该零件。
Aluminum alloy hemispherical parts for aviation common structural parts, which is characterized by thin wall thickness, large deformation, usually multi-step method of forming. In order to improve the product quality and production efficiency, it is proposed to adopt the method of coating stainless steel on the surface of the aluminum alloy billet for forming the viscous medium. The finite element software ANSYS / LS-DYNA was used to simulate the forming process of aluminum alloy hemispherical covering stainless steel viscous medium. The influence of blank holder force and viscous medium pressure on the forming process was analyzed. Different loading conditions of blank holder force The wall thickness distribution of the specimen under forming, the inflow of material into the deformation zone and the pressure field of the viscous medium in the flange area were tested and verified. The results show that under the condition of suitable loading curve, the stainless steel can be used to carry out the deep drawing of the aluminum alloy hemispherical viscous medium, which can improve the uniform deformation capacity of the aluminum alloy and can directly form the part.