Synthetic polycrystalline diamond is made of carefully selected single crystals with excellent quality and quantity, and a small amount of silicon, titanium and other binders. Under the condition of high temperature and high pressure, the hardness of polycrystalline diamond is also very high, and it has good wear resistance.
Compared with tungsten carbide, the tensile strength of polycrystalline is almost 70% of that of commonly used tungsten carbide, but 250% harder than that of tungsten carbide. In this way, polycrystalline has more advantages than tungsten carbide. The drawing die made of polycrystalline diamond (PCD wire drawing dies)has good wear resistance, uniform wear of hole wall, good impact resistance and good drawing quality.
The diamond drawing die is made of pure diamond. There is no metal licking additive in the die core material. The smooth finish and service life of the drawing die are better than those of the polymer die.
With the continuous development of the wire drawing industry, people's requirements for the quality of the wire drawing die are constantly improving, especially the selection of the key factor of the material of the wire drawing die is very important. Not only from the economic point of view, but also from the efficiency of practical application. According to the current conditions, tungsten carbide die, polycrystalline die and CVD diamond die will be and are widely used.
Tungsten carbide die is suitable for drawing wire or profile with larger diameter. Generally, it is more practical to use J polycrystalline diamond wire drawing die to draw softer metal wire. It is more suitable for 0.5 ~ 8mm, Especially for the drawing of stainless steel wire below 0.2mm, CVD diamond drawing die has more advantages.