With the development of the cable industry, the types of cable products are diversified, and customers have special requirements for cable products. The types and requirements of cable - related molds have gradually increased. In the cable industry, there are many molds involved, such as wire drawing and stranding molds.

     Wire drawing molds are generally called wire dies, which can be divided into round dies and shaped dies. Commonly used wire die materials include diamond dies, cemented carbide dies, polycrystalline dies, etc. Diamond dies have the highest hardness, are wear - resistant but expensive, and are generally used for drawing small - gauge single - strand wires. Cemented carbide dies have replaced the previous tungsten steel dies in the drawing production. Compared with steel dies, they have the advantages of good wear resistance, good polishing performance, low adhesion to the processed metal, low friction coefficient, high thermal conductivity, and strong corrosion resistance. Polycrystalline dies are the most commonly used wire dies at present. They have wear resistance, but the surface of the products produced is not smooth. Tungsten steel dies are commonly used for aluminum drawing, have a short service life, and are generally used for bridge - passing dies. Their wear resistance is average, the price is low, and the strength is not suitable for copper drawing. The surface of the drawn wire core is not smooth.

     The die hole structure includes the entrance area, lubrication area, working area, sizing area, and exit area. The entrance area and lubrication area generally have arcs, which are convenient for the drawn wire to enter the working area without being damaged by the edge of the die hole, and can also store the lubricating fluid to play a lubricating role. The working area is the area where the metal undergoes tensile plastic deformation, and the selection of its height and cone angle has certain principles. The sizing area enables the product to obtain the final size, and the selection of its height also has corresponding principles. The exit area can protect the sizing area from cracking, and the exit cone angle can avoid the metal wire being damaged at the exit of the sizing area and being scratched when the wire is reversed during shutdown.