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为了解决高强度硼钢板厚度分布不均造成圆角破裂现象,建立了热力耦合有限元模型,通过分析得出产生圆角破裂的原因为该区域的温度和应力变化所致,并利用正交试验找出防止该制件圆角破裂的最佳工艺方案组合。结果表明:在板料初始温度、压边力、摩擦系数这3个工艺参数中,摩擦系数对制件圆角减薄率的影响最大;在初始成形温度为850℃、压边力为70 MPa、摩擦系数为0.1左右时成形性能较好;在该工艺条件下进行试验获得了合格制件,验证了模拟结果的正确性。
In order to solve the problem of the round rupture caused by the uneven thickness distribution of high strength boron steel plate, a finite element model of thermal coupling was established. The reason of the round rupture was analyzed by the change of temperature and stress in this area. Find the best combination of process options to prevent the fillet from breaking. The results show that the coefficient of friction has the greatest effect on the fillet reduction rate of the fillers in the three process parameters of sheet initial temperature, blank holder force and friction coefficient. When the initial forming temperature is 850 ℃, the blank holder force is 70 MPa , And the friction coefficient is about 0.1, the formability is better; the qualified parts are obtained under the conditions of the process, and the correctness of the simulation results is verified.