用胎模锻造薄壁杯形件时,坯料的变形量大,冷却快,变形抗力较大,出模困难。通常,为了便于脱模,须在出模方向设计模锻斜度,并把冲头的头部设计成圆球形或带很大的圆角。孔越深、孔径越 Die forging thin walled die, the billet deformation, cooling fast, large deformation resistance, the mold is difficult. In general, for ease of demolding, the draft angle must be designed in the direction of the die and the head of the punch should be designed to be spherical or have a large fillet. The deeper the hole, the more the aperture