Wire Drawing Dies

Wire drawing dies are tools with highly-polished, specially-shaped holes through which wire is drawn to reduce its diameter. They have a metal case and a nib made of tungsten carbide (TC), polycrystalline diamond (PCD), or natural diamond.
Specifications
When selecting wire drawing dies, wire material and drawing parameters are important specifications to consider. Typically, wire materials include copper, stainless steel, aluminum alloy steel, tungsten, galvanized high-carbon steel, gold, silver, stainless steel, low-carbon steel, molybdenum, and nickel. Drawing parameters include measurements such as inlet diameter, bell radius, entrance angle, approach angle, bearing and back relief. Elongation, the ratio of length after drawing to the length prior to drawing, is also an important consideration when choosing wire drawing dies.
Types
There are many different types of wire drawing dies. Examples include standard wire drawing dies, PCD wire drawing dies, TC wire drawing dies, and enameling wire drawing dies. Standard wire drawing dies have a well-defined reduction angle that reduces drawing force and provides uniform die-formation with a consistent surface finish. PCD wire drawing dies use polycrystalline diamond (PCD), a synthetic material which provides superior resistance to cracking and wear. TC wire drawing dies are made from tungsten carbide, an extremely hard and scratch-resistant material that is often used in tool bits. Tungsten carbide wire drawing dies are often used to draw thicker wires, and in applications where PCD dies are too expensive. Enameling wire drawing dies are used with enameled wires and may feature internal geometries which are suitable for very small wire sizes.