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The piercing is a manufacturing process from the group of pressing in that the pressure forming counts.

When punching, a hole is made in a workpiece by machining it from both sides up to about half the workpiece height with thorns . The residues that arise when perforating are significantly smaller than, for example, when drilling . Punching is often used in factories in which other forming processes are also used, particularly in the manufacture of rings for subsequent ring rolling . In this case, the perforation is usually carried out as hot forming due to the lower machining forces, using tools made of hot-work steel . In the cold forming tools are made of cold steel sufficient.