锥形件拉伸是生产中较为困难的冲压成形工艺,钢性凸模拉伸时,若零件相对高度h_1/d_2较大或相对锥顶直径d/d_2较小时,毛坯中间悬空部分易起皱,凸模下端坯料易变薄或拉裂,当相对厚度t/d_2很小时也易产生上述缺陷。为此生产中采用图1所示的阶 Conical stretching is more difficult in the production of stamping forming process, the steel punch punch, if the relative part of the relative height h_1 / d_2 or relative cone diameter d / d_2 smaller, the middle part of the blank easy to wrinkle , Punch the lower end of the material is easy to thin or crack, when the relative thickness t / d_2 is also very easy to produce the above defects. For this purpose, the steps shown in Figure 1 are used