Die and Punch

A die is a female part of a complete tool for producing work in a press. A punch is a male component of the die assembly, which is directly or indirectly moved by the press ram. The dies may be classified as follows:

1. According to the type of press operation. According to this criterion, the dies may be classified as cutting dies and forming dies. The cutting dies are used to cut the metal. The common cutting dies are blanking dies, piercing dies, perforating dies etc.

The forming dies change the appearance of the blank without removing any stock. These dies include bending dies, drawing dies, etc.

2 According to the method of operation. According to this criterion, the dies may be classified as simple dies, compound dies, combination dies and progressive dies.

In a simple die, only one operation is performed for each stroke of the press ram.

In a compound die, two or more cutting operations are performed at one station of the press in every stroke of the ram. The washer is produced by simultaneous blanking and piercing operations in a compound die.

In a combination die, two or more operations are performed simultaneously at one station in the single stroke of the ram. It differs from compound die in that the cutting operation is combined with a bending or forming operation in a combination die.

In a progressive die, two or more operations are performed simultaneously, but at different stations.