变凸模运动曲线对板料成形极限性能的影响

摘要

Most research works about unstability deep‐drawing of sheet metal didn't take the influences of die motion curves on limited forming property of sheet metal into considerations . T he application of servo‐press makes it possible to change the speed and position of the slide . Taking the cylindrical cup as an example , the ANSYS/LS‐DYNA is used to simulate the process of the deep drawing with the various curves of the die motion .The results illustrate that various die motion curves influences significantly on the distribution o f thickness reduction rate in a cylindrical cup .The most significant influence on the improvement of limited forming capacity of sheet metal is the stair‐alike die motion curve .%研究影响板料拉深失稳的因素大都忽略凸模运动曲线对板料成形极限性能的影响，利用伺服压力机可加载任意滑块速度和位移，以筒形件拉深为研究对象，加载了不同的凸模运动曲线，采用ANSYS／LS‐DYNA进行拉深模拟并经实验论证。结果表明，不同的凸模运动曲线对拉深件厚度减薄率分布会产生很大的差异，其中台阶式凸模运动曲线对提高板料极限成形能力最为显著。