The concept of punching designates a slitting process in which a sheet is severed in one stroke. Shapes such as round holes are created in the part, and external contours are cut with single strokes.
A punching machine works like a hole punch for paper. The punch presses the paper against the support of the hole punch and finally into a round opening. The scrap from the punching collects in the hole punch container.
Punching works exactly the same way: the sheet is positioned between the punch and the die. The punch moves downward and plunges into the die. The edges of the punch and the die move past each other in parallel, cutting the sheet.