Nowadays, Punching is usually the most cost effective method for creating holes in sheet metal materials from medium to high production volumes. The process when a specially shaped punch is used to create multiple usable parts from a sheet of material is known as blanking. In metal forging applications the work is often punched while hot, and this is called hot punching. Slugging is the punching in which punch is finished as soon as the metal fracture is complete and metal is not removed but still held in hole.
PUNCHING PROCESS
Punch and die is often made of tungsten carbide (tungsten carbide punches and dies) or hardened steel. A die is located on the opposite side of the work piece and supports the material around the perimeter of the hole and helps to localize the shearing forces for a cleaner edge. There is a small amount of clearance between the punch and the die to stop the punch from sticking in the die and so less force is needed to make the hole. The amount of clearance needed depends on the thickness, with thicker materials requiring more clearance, but the clearance is always greater than the thickness of the work piece. The clearance also depends on the hardness of the work piece. The punch press forces the punch through a work piece, producing a hole that has a diameter equivalent to the punch, or slightly smaller after the punch is removed. All ductile materials stretch to some extent during punching which often causes the punch to stick in the work piece. In this case, the punch must be physically pulled back out of the hole while the work is supported from the punch side, and this process is known as stripping. The hole walls will show burnished area, rollover, and die break and must often be further processed. The slug from the hole falls through the die into some sort of container to either dispose of the slug or recycle it.
Dongguan JLS Precision Mold Parts Co.,Ltd has been devoted to the manufacturing of customized tungsten carbide punch and die for almost 20 years. Our products have been exported to Japan, Germany, France, United Kingdom, etc. We understand that 100% accuracy, unbeatable service and rapid delivery saves our customers’ time and money. Our tool makers are highly trained and we utilize the best machine tool technology to produce the best possible tooling for our customers.
