Tooling
The amount of clearance between a punch and die for piercing is governed by the thickness and strength of the workpiece material being pierced. The punch-die clearance determines the load or pressure experienced at the cutting edge of the tool, commonly known as point pressure. Excessive point pressure can lead to accelerated wear and ultimately failure.
Burr height is typically used as an index to measure tool wear, because it is easy to measure during production.
A simple operation may only need a pancake die. While many dies perform complex procedures simultaneously, a pancake die may only perform one simple procedure with the finished product being removed by hand.
Read more about this topic: Blanking And Piercing