Using variable blank holder force can remarkably improve the forming performance, and the limitingdrawingratio would reach 5.0.
采用变压边力可以明显提高板材的冲压性能，极限拉深比将达到5.0。
2
Through the limitingdrawingratio tests, the influences of rolling, annealing, blank holder force, drawing gap, drawing temperature and speed on the forming performance were investigated.