Characteristics of tungsten carbide are high hardness, good wear resistance and high compressive strength, so it is suitable for making dies such as powder metallurgy dies, such as tungsten carbide pressing dies.

 

Tungsten carbide in China started late, but it has developed rapidly. At present, the tungsten carbide die has been basically serialized and standardized. From the development of recent years, the theory of research and design of tungsten carbide dies is more thorough, more scientific and more widely used.

 

 

1, High Hardness and Good Wear Resistance

The hardness of the tungsten carbide is next to diamond and cubic boron nitride. Its hardness range is HRA86-94. The lowest hardness of the tungsten carbide (HRA84-86) is greater than the maximum hardness of the tool steel (HRC64-69). The wear resistance of high cobalt tungsten carbide die is better than that of HRC63-65, and the die life is longer.

 

2, High Modulus of Elasticity

The modulus of elasticity of the tungsten carbide is 3-4 times that of the tool steel, which means that the mould has a higher ability to resist deformation. Under the working stress of pressing, the deformation of the tungsten carbide die is smaller than that of the steel die. As a result, the size of the product and the size of the die are very close, so the machining accuracy of the product is high.

 

At the same time, due to the higher modulus of elasticity and smaller elastic aftereffect, it has the advantages of controlling the crack of the blank. The deflection is much smaller when it is subjected to force, which is of special value for the manufacture of longer mold parts with thin and sharp edges.

 

3, Low Friction Coefficient

When draw metal materials are made, electrical energy consumption can be greatly reduced. At the same time, it has little adhesion to metal material processing (affinity), which makes the mold surface is not easy to injury nap. Therefore, the tungsten carbide die not only has a high life span, but also has good surface quality, which can even be processed in mirror surface. Thus, the subsequent buffing, polishing, and other processing procedures of the products can be omitted.

 

4, Superior Hot Property

The thermal expansion coefficient of tungsten carbide is only 1/2 of steel. So even if the temperature increases at work, the error of the mold size is 1 times smaller than that of the steel mold.