Punching process where special tools are used to create a number of holes in a single stamping. Beskrivning The process When punching, the workpiece so placed on the lower tool, the die. The upper tool, the punch is hit or is pressed against the workpiece with an applied pressing force. In this method, the tool is designed to create a multitude of holes in a single punch stroke. After each stroke, the plate moves up a step so as to create a completely perforated sheet. To punch out a hole the material is subject to shearing between the punch and die. During the punching process material is displaced and then loosen completely by material failure. This gives both the punched detail and bore, the typical cut surface seen in punching operations i.e., smooth surface [4] where the material has slipped and a rougher surface [5] where the failure occurs. Perforation
