Briefly describe the influence of three kinds of die cores on the life of drawing dies

First, natural diamond The hard alloy used for wire drawing die is carbide cobalt alloy with low cobalt content. It has good wear resistance, impact resistance, polishing and corrosion resistance, is easy to repair, and is cheap. It is a commonly used material for making wire drawing die cores, and is widely used for drawing thick and medium wires. The research shows that by improving the composition and structure of cemented carbide, controlling the fluctuation value of carbon content and refining the carbide particles, the performance of the material can be improved and its service life can be extended. At present, hot isostatic pressing (HIP) treatment, ultra-fine grain processing and the addition of rare earth elements are used at home and abroad to reduce porosity, refine grains, improve alloy hardness and reduce friction coefficient; Diamond films or titanium nitride coatings were formed on the surface of cemented carbides by chemical vapor deposition (CVD) and physical vapor deposition (PVD) to improve the surface strength of the alloys. Type II. Cemented carbide Natural diamond, commonly known as diamond, is the hardest material in nature, with high wear resistance and heat conductivity. It can improve the surface quality of wire, improve the performance and dimensional accuracy of wire when used for drawing tungsten molybdenum wire, and is mainly used for drawing thin wire and finished wire. However, it is very brittle, has poor impact resistance, and has anisotropic hardness, so it is easy to wear unevenly when making wire drawing dies. In addition, diamond is rare, expensive and difficult to process, so it is limited in drawing medium and thick wire. The third is synthetic diamond Synthetic diamond, also known as polycrystalline diamond, is a polycrystal formed by the non directional polymerization of many single crystal particles. It has high strength and hardness, strong impact resistance, uniform properties and good comprehensive performance. When drawing medium and fine wires, the service life is higher than that of diamond die and hard alloy die, the wire size is stable, and the surface quality is good. However, the synthetic polycrystalline diamond has coarse grains and is difficult to polish, and the surface finish of the drawn filament is not as good as that of the natural diamond. The polishing performance can be improved by refining the grain, and the natural diamond can be replaced on the drawing die of medium and fine wire, which greatly reduces the cost and improves the product quality. Note: The article comes from the network. If there is infringement, please contact to delete it