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Sheet Metal Manufacturing Processes - Sheet Metal Piercing, Punching and Blanking, Turret Punching
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Piercing, punching and blanking is performed by using a die to shear shapes out of pieces of sheet metal. The material is placed over the die and the punch rapidly descends to punch out the metal to be removed.
Punching refers to the removal of unwanted metal to produce a hole. The hole can be a basic round hole for use with fasteners, or it can be almost any shape imaginable. Examples of punching are production of fastener holes, punching of vent holes in enclosures, or punching of location features in equipment housings.
Blanking refers to the punching out of a finished shape from a strip or sheet of metal to form holes, openings and features. The piece being punched out can also be the component to be used. Blanked holes can be almost any 2D shape imaginable within some design constraints. Sheet metal blanking it typically carried out using a turret punching machine.
Almost any sheet material can be punched or blanked in a large variety of thicknesses. Tight control of the clearance between punch and die is necessary to achieve a clean, burr free shear. Clearance between punch and die must also be controlled for varying thickness of material and to a lesser extent the type of material. Therefore, a die is usually purpose built for the specific material being punched.
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