Commonly used core materials for wire drawing die are carbide, natural diamond, synthetic diamond, etc;  When selecting a wire drawing die, the core material 

should be selected according to different processing steps, the material properties of the wire to be processed, and the quality requirements of the wire. Reasonable 

choice of core material is the main way to extend its service life, such as PCD wire die blanks drawing steel, cable, etc.

The following describes the influence of different cores on the life of the wire drawing die:

1.Cemented carbide

The cemented carbide for drawing die is a carbide with a low cobalt content---tungsten-cobalt alloy, which has good wear resistance, impact resistance, polishing and 

corrosion resistance, is easy to repair, and is inexpensive. It is a commonly used wire drawing core making material, which is widely used in the stretching of coarse and

medium wires. Studies have shown that by improving the composition and structure of cemented carbides, controlling the fluctuations in carbon content and refining the

particles of carbides, the properties of the materials can be improved and their service life can be extended. At present, domestic and international use of hot isostatic

pressing (HIP) treatment, ultra-fine crystal technology and the addition of rare earth elements to reduce porosity, refine grains, improve the hardness of the alloy, reduce

the friction coefficient; and use chemical vapor deposition (CVD) The method and physical vapor deposition (PVD) method form a diamond film or a titanium nitride coating 

on the surface of the cemented carbide to improve the surface strength of the alloy.

2. Natural diamond

Natural diamond, commonly known as diamond, is the hardest substance in nature. It has high wear resistance and thermal conductivity. It can improve the surface quality of 

wire and improve the performance and dimensional accuracy of wire when it is stretched. Stretch the filaments and the finished filaments. However, it is very brittle, has poor

impact resistance, and has an anisotropic hardness, which is prone to wear and tear when the wire drawing die is made. In addition, the diamond is rare, expensive, and difficult 

to process, so it is limited in stretching and thickening.

3. Synthetic diamond

Synthetic diamond, also known as polycrystalline diamond, is a polycrystal formed by non-directional polymerization of many single crystal particles. It has high strength and hardness,

strong impact resistance, uniform properties and good overall performance. In the process of stretching and filament, the service life is higher than that of the diamond mold and the 

cemented carbide mold, and the wire material is stable in size and good in surface quality. However, the crystal grains of the artificial polycrystalline diamond are coarse and difficult to 

polish, and the surface roughness of the drawn filament is not as good as that of natural diamond. By refining the crystal grains, the polishing performance can be improved, and the

natural diamond can be replaced on the drawing mold of the medium and fine filaments, thereby greatly reducing the cost and improving the product quality.