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Dies are tools used for the shaping solid materials, especially those employed in the pressworking of cold metals.
In presswork, dies are used in pairs. The smaller die, or punch, fits inside the larger die, called the matrix or, simply, the die. The metal to be formed, usually a sheet, is placed over the matrix on the press. The punch is mounted on the press and moves down by hydraulic or mechanical force.
A number of different forms of dies are employed for different operations. The simplest are piercing dies (пробивной штамп), used for punching holes. Bending and folding dies are designed to make single or compound bends. A combination die is designed to perform more than one of the above operations in one stroke of the press. A progressive die permits successive forming op¬erations with the same die.
In coining, metal is forced to flow into two matching dies, each of which bears a engraved design.
Wiredrawing Dies
In the manufacture of wire, a drawplate (волочильная доска) is usually employed. This tool is a metal plate con¬taining a number of holes, successively less in diameter and known as wire dies. A piece of metal is pulled through the largest die to make a coarse wire. This wire is then drawn through the smaller hole, and then the next, un¬til the wire is reduced to the desired measurement. Wiredrawing dies are made from extremely hard mate¬rials, such as tungsten carbide or diamonds.
Thread-Cutting Dies
For cutting threads on bolts or on the outside of pipes, a thread-cutting die (резьбонарезная плашка) is used. It is usually made of hardened steel in the form of a round plate with a hole in the centre. The hole has a thread. To cut an outside thread, the die is lubricated with oil and simply screwed onto an unthreaded bolt or piece of pipe, the same way a nut is screwed onto a bolt. The correspond¬ing tool for cutting an inside thread, such as that inside a nut, is called a tap (метчик).

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