Countersinking is a process used in sheet metal forming. This process consists of forming a truncated hole. The obtained internal shape is called countersink and it is used to locate a rivet or screw head. When placed in conical hole, the head of these components must sit flush with the surface with the surrounding material. In practice, the sheet is rigidly clamped around its periphery by a blank-holder, and then a truncated punch concentrates deformation to enlarge the side of existing hole Fig. 1. Workpiece performed by countersinking are known by their high mechanical properties and their low cost beside the low material waste and the high productivity.
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