The performance of tungsten carbide mould material

       The use performance of tungsten carbide material pot mold material:



The working conditions of various molds are different, and the performance requirements of mold materials are also different. According to the working conditions and service life of the mold, the mold worker often chooses the mold material and heat treatment process reasonably, so as to achieve the best performance of the main performance, while the other performance loss is the least. The performance requirements of all kinds of mold materials mainly include hardness, strength, plasticity, toughness and so on.



(1) hardness and thermal hardness.



Hardness is the main performance index of mold material, mold under the action of stress, should be able to maintain the shape and size of the same. Therefore, the mold should have enough hardness, such as cold mold hardness should be kept at about 60 HRC. The hardness of hot mold and plastic mold can be appropriately reduced, generally within the range of 40-50 HRC. Thermal hardness refers to the ability of mold to maintain stable organization and performance under high temperature working conditions. This is an important performance index of hot working die and heavy duty fast cold working die. It is generally required to maintain sufficient hardness under the condition of 500-600 C.



(2) Wear resistance.



Wear resistance of die material is an important factor to determine the service life of die. The mould is subjected to considerable compressive stress and friction force, which requires the mould to keep its accuracy unchanged under strong friction. Die wear can be divided into three types: mechanical wear, oxidation wear and melt wear. The wear resistance of die depends not only on the composition, structure and properties of the material, but also on the working temperature, pressure state and lubrication state of die.



(3) strength and toughness.



Tungsten carbide material pot mold in use under tension and pressure, impact, vibration, torsion and bending stress, heavy load mold often due to insufficient strength, toughness, resulting in local collapse, edge collapse and fracture of the mold and early failure. Therefore, keeping enough strength and toughness of the die material will be beneficial to prolong the service life of the die. It has been proved that the best combination of strength and toughness can be obtained by choosing the chemical composition, structure state and heat treatment process of die material rationally according to the use conditions and performance requirements.



(4) fatigue resistance.



The mold works under the alternating stress of mechanical impact and thermal impact. In the process of hot working die, the thermal alternating stress leads to the hot crack more obviously. Cracks caused by stress and temperature gradient are usually shallow and fine cracks formed on the surface of the cavity. Its rapid propagation and expansion lead to catastrophic accidents and the die is scrapped. The formation and propagation of fatigue cracks can be effectively delayed by improving the fatigue resistance of materials.