It usually refers to various dies for drawing metal wires, as well as drawing dies for drawing optical fibers. All drawing dies have a hole in the center of a certain shape, round, square, octagonal or other special shapes. When the metal is pulled through the die hole, the size becomes smaller and even the shape changes. A steel mold is sufficient when drawing soft metals (such as gold and silver), and the steel mold can have multiple holes with different diameters. The drawn steel wire generally uses a cemented carbide die (Tungsten carbide nib). The typical structure of this die is a cylindrical (or slightly tapered) cemented carbide die core tightly embedded in a circular steel sleeve In case, there are bell radius, entrance cone, approach angle, bearing and back relief in the inner hole of the mold core. For drawing non-ferrous metal wires, such as copper and aluminum, wire drawing dies similar to steel wire molds are often used. The shape of the inner hole is somewhat different. For thinning wires, polycrystalline molds (man-made diamonds) can be used, and natural diamonds are also used.
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