Introduced design method and points of separation combined extruding die with ladder-shape punch in extruding die, stated extruding die design process and thought using practical example.

介绍了挤压型材模具中，具有阶梯式凸模的分流组合模设计的方法和设计要点，用实例阐述了该类型模具的设计过程和设计思路。

youdao

The cloud's round shape is likely what is known as a hole-punch cloud.

云的圆形很可能就是人们所称的穿洞云。

youdao

Punch press: machine tool that changes the size or shape of a piece of material usually sheet metal by applying pressure to a die in which the workpiece is held.

冲床：将压力加到装有工件的模具上，以改变一片材料，通常是金属片的大小和形状的机床。

youdao

Bend your knees and duck down, rolling your head in a 'U'shape under the punch from 'inside' to 'out.

BBC: DEFENCE