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运用数值模拟和拉深实验研究了不同冲压速度对双相钢B340/590DP板材拉深极限系数的影响。数值模拟显示,随着冲压速度由10 mm·s~(-1)增加到60 mm·s~(-1),0.8 mm厚的板料减薄率由11.473%增大到16.638%。相同工艺参数的伺服压力机对板料进行拉深实验的结果表明,冲压速度大于60 mm·s~(-1)时,易在成形中出现拉裂现象,数值模拟有限元模型得到的成形极限性能与实际拉深实验数据有较好的一致性。对滑块的运动速度轨迹进行控制的拉深成形模式下,拉深深度超过10 mm时再调高冲压速度,可以减少拉裂、起皱等缺陷。在伺服压力机的使用中合理地设置初始和后续成形速度,能提高拉深成形的极限速度,从而提高加工成形效率。
The effects of different stamping speeds on the drawing limit factor of duplex steel B340 / 590DP were studied by numerical simulation and drawing experiments. Numerical simulation shows that as the punching speed increases from 10 mm · s ~ (-1) to 60 mm · s ~ (-1), the thinning rate of 0.8 mm thick sheet increases from 11.473% to 16.638%. The results of the drawing experiments on the sheet by the servo press with the same process parameters show that when the pressing speed is more than 60 mm · s -1, the cracking phenomenon is easy to occur in the forming. The forming limit obtained by the numerical simulation finite element model Performance and actual drawing data have better consistency. Under the deep drawing forming mode that controls the movement speed of the slider, the drawing speed can be increased when the drawing depth exceeds 10 mm, so as to reduce the defects such as cracking and wrinkling. In the use of servo press reasonable set initial and subsequent forming speed, can improve the forming speed limit, so as to improve the efficiency of forming.