Extruding

(1) The turning up or drawing out of a flange around a hole which has been punched in a previous operation. Also called hole flanging. (2) The punching and flanging of a hole in one operation generating a slug. (3) The cutting or tearing (piercing) and flanging of a hole in one operation without generating a slug. Also called spearing or spear punching.

Source: The OHIO State University