Reasons for damage of polycrystalline wire drawing die

Reasons for damage of polycrystalline wire drawing die

Polycrystalline wire drawing die is made of hard alloy, its main components are tungsten carbide and cobalt. Tungsten carbide is the "skeleton" of the alloy, which mainly plays a hard and wear-resistant role. Cobalt is a bonding metal and a source of alloy toughness. Therefore, compared with other molds, polycrystalline wire drawing has the following characteristics: high wear resistance, good polishing, low adhesion, low friction coefficient, low energy consumption, high corrosion resistance. These characteristics make the cemented carbide wire drawing die have a wide range of processing adaptability.

However, if it is not well protected, the service life of polycrystalline wire drawing will become shorter. Because the wire or steel wire or even steel bar will change after passing through the wire drawing die. It is a cold-drawn steel wire whose diameter is smaller than the diameter of the original wire or steel wire, and the polycrystalline wire drawing die usually wears out during repeated use. In order to extend the service life of the die, we will analyze the reasons for the rapid damage of the wire drawing die, because avoiding these reasons can effectively extend the service life of the wire drawing die, let's take a look.

1. Asymmetric inlay of polycrystalline wire drawing die blank and die steel sleeve, uneven distribution or gap of inlaid hard alloy steel sleeve, easy to lead to U-shaped cracks in the wire drawing process.

2. polycrystalline wire drawing mold blank in the laser drilling process. In this process, the sintering marks will not be cleaned or heated unevenly, which will cause the metal catalyst and adhesive in the diamond layer to gather together, which is easy to produce a depression during the wire drawing process.

3. the design of polycrystalline wire drawing die is unreasonable, the inlet lubrication area is large, if the opening hole is too small and the solidification area is too long, it will cause poor lubrication, resulting in mold wear and even fragmentation.

Finding these reasons and formulating corresponding countermeasures can effectively extend the service life of polycrystalline wire drawing die, reduce production cost and improve work efficiency.