发明授权
US3724247A Production of deep drawn pressings 失效
生产深冲压力

Production of deep drawn pressings
摘要:
Wrinkle free deep drawn shells are formed from aluminium foil and other similar materials by employing a tapered die and a punch having a radially compressible elastic or hydropneumatic element at the nose end of the punch, such element having initial dimensions approximately equal to those of the die mouth.
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