For tungsten carbide drawing dies, what everyone cares most is how to operate the standard and how to maintain it to wear resistance. Today, I will share with those who have tungsten carbide drawing dies or who want to buy tungsten carbide drawing dies what tungsten carbide drawing dies should be How to maintain it to wear.
After the cemented carbide tungsten carbide drawing die is used for a period of time, its internal parts will gradually wear out and be damaged, which will reduce the working performance and accuracy of the tungsten carbide drawing die. Due to the carelessness of the operator and improper maintenance and use, it will also cause damage. The tungsten carbide drawing mold is damaged or the product quality is degraded, or even the production is stopped. How to eliminate and avoid these failures, this requires the number of cemented carbide mold fitters to master the relevant mold repair technology, so that failures can occur at any time, and they can be dealt with and repaired at any time. , So that it can return to normal use as much as possible, and has exerted the maximum potential of the mold.
The following introduces the influence of different material cores on the life of the wire drawing die
1. Cemented carbide
The cemented carbide used for the tungsten carbide drawing die is a carbide with low cobalt content-tungsten-cobalt alloy, which has good wear resistance, impact resistance, polishing and corrosion resistance, and is easy to repair. The price is low, and it is a commonly used material for drawing mold cores, and is widely used for drawing thick and medium filaments. Studies have shown that by improving the composition and structure of the cemented carbide, controlling the fluctuation value of the carbon content, and refining the carbide particles, the performance of the material can be improved and its service life can be prolonged. At present, hot isostatic pressing (HIP) treatment, ultra-fine grain technology and the addition of rare earth elements are used at home and abroad to reduce porosity, refine grains, increase alloy hardness, and reduce friction coefficient; and use chemical vapor deposition (CVD) Method and physical vapor deposition (PVD) method to form diamond film or titanium nitride coating on the surface of 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. When used in tungsten carbide drawing dies, it can improve the surface quality of the wire, and improve the performance and dimensional accuracy of the wire. It is mainly used for Stretching filaments and finished filaments. However, it is very brittle in nature, poor in impact resistance, and anisotropic in hardness, which makes it easy to wear unevenly when making tungsten carbide tensile molds. In addition, diamonds are scarce, expensive, and difficult to process, so they are restricted in drawing and thick wire.
3. 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 overall performance. In the process of drawing and thin wire, the service life is longer than that of diamond die and cemented carbide die, and the size of the wire is stable and the surface quality is good. However, the grains of artificial polycrystalline diamond are relatively large and difficult to polish, and the surface finish 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 natural diamond can be replaced on the medium and fine wire drawing dies, which greatly reduces the cost and improves the product quality.
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