Materials for the workpiece can vary, commonly being metals and plastics. The workpiece is often in the form of a sheet or roll. Geometry Titanium nitride (TiN) coated industrial punches using cathodic arc deposition technique It creates a burnished region roll-over, and die break on sidewall of the resulting hole.Punches and dies are usually fabricated from conventional tool steel or carbides.It is able to create multiple shaped holes.It is the most cost effective process of making holes in strip or sheet metal for average to high fabrication.The slug from the hole falls through the die into some sort of container to either dispose of the slug or recycle it. The hole walls will show burnished area, rollover, and die break and must often be further processed. 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. All ductile materials stretch to some extent during punching which often causes the punch to stick in the workpiece. The punch press forces the punch through a workpiece, producing a hole that has a diameter equivalent to the punch, or slightly smaller after the punch is removed. The clearance is also dependent on the hardness of the workpiece. The amount of clearance needed depends on the thickness, with thicker materials requiring more clearance, but the clearance is always less than the thickness of the workpiece. ![]() There is a small amount of clearance between the punch and the die to prevent the punch from sticking in the die and so less force is needed to make the hole. A die is located on the opposite side of the workpiece and supports the material around the perimeter of the hole and helps to localize the shearing forces for a cleaner edge. Punch tooling (punch and die) is often made of hardened steel or tungsten carbide. Slugging is a type of metal-punching operation in which the action of the punch is stopped as soon as metal fracture is complete the punched piece is not removed but is left in the hole. In metal forging applications the work is often punched while hot, and this is called hot punching. the punched-out piece is the good piece), the process is known as blanking. When a specially shaped punch is used to create multiple usable parts from a sheet of material (i.e. Punching is often the cheapest method for creating holes in sheet materials in medium to high production volumes. Depending on the material being punched this slug may be recycled and reused or discarded. A scrap slug from the hole is deposited into the die in the process. The punch often passes through the work into a die. Punching is applicable to a wide variety of materials that come in sheet form, including sheet metal, paper, vulcanized fibre and some forms of plastic sheet. Punching is a forming process that uses a punch press to force a tool, called a punch, through the workpiece to create a hole via shearing. JSTOR ( January 2010) ( Learn how and when to remove this template message)Įxtruded holes with the punch and die used to create them. ![]() Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. ![]() This article needs additional citations for verification.
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