How Should the Drawing Die Be Maintained to Be Wear-resistant?

After buying a drawing die, what everyone cares about most is how to operate it according to the standards and how to maintain it to be wear-resistant. Today, we will share with those who have a drawing die or who want to buy a drawing die how to maintain the drawing die to be wear-resistant.

After the cemented alloy or carbide alloy 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 cemented alloy drawing die. Due to the carelessness of the operator and improper maintenance and use, the carbide drawing dies will also be damaged and the product quality will be degraded, or even the production will be stopped. How to eliminate and avoid these faults? It requires more cemented alloy die bench workers to master the relevant die repair technology, so that whenever failures occur, they can be dealt with and repaired at any time. And the die can return to normal use as soon as possible, and the greatest potential of the die can be exerted.

The following introduces the influence of different material cores on the service life of drawing dies:

1. Cemented alloy

The cemented alloy used for drawing dies is a carbide with low cobalt content - Tungsten-cobalt alloy. It has the good wear resistance, impact resistance, polishing and corrosion resistance, which is easy to repair, and has a low price. It is a commonly used material for drawing die cores and is widely used for drawing thick and medium wires. Studies have shown that by improving the composition and structure of the cemented alloy, 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 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 alloy 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 for tungsten molybdenum wire drawing, it can improve the surface quality of the wire, and improve the performance and dimensional accuracy of the wire. It is mainly used to draw thin and finished wires. But it is very brittle in nature, poor in impact resistance, and anisotropic in hardness, which makes it easy to wear unevenly when making drawing dies. In addition, diamond is scarce, expensive, and difficult to process, so it is restricted in drawing medium and thick wires.

3. Synthetic diamond

Synthetic diamond is also called polycrystalline diamond. It 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 medium and thin wires, its service life is longer than that of diamond die and cemented alloy dies, and the size of the wire is stable, and the surface quality is good.

However, the artificial polycrystalline diamond has relatively coarse grains and is difficult to polish, and the surface smoothness of the drawing thin wires is not as good as that of natural diamond. By refining the crystal grains, the polishing performance can be improved, and the natural diamond can be replaced by it on the drawing dies for medium and thin wires, which greatly reduces the cost and improves the product quality.