|The drawing die made of polycrystalline diamond has good wear resistance, uniform inner hole wear, strong impact resistance and high drawing power.
Compared with cemented carbide, the tensile strength of polycrystalline diamond is only 70% of that of common cemented carbide, but its hardness is 2.5 times of that of cemented carbide.
In this way, the polycrystalline diamond drawing die has more advantages than the cemented carbide drawing die.
The polycrystalline diamond drawing die has the following obvious advantages:
1. Good wear resistance and long service life. The service life of polycrystalline diamond drawing die is about 30 ~ 50 times longer than that of cemented carbide drawing die, so it is not necessary to stop and replace the die frequently in the drawing process. The diameter of polycrystalline drawing die changes little in unit time, and the size of drawn wire is small, which is very beneficial to the winding of wire. Generally, the number of winding coils is fixed. If the size of wire rod becomes larger quickly and the number of winding coils is reduced rapidly, it is necessary to change the reel size constantly, which is not conducive to the improvement of production power.
2. High drawing power. The necessary maintenance of the drawing die is very important to the service life of the drawing die and the surface quality of the wire rod. Generally, customers are advised to maintain the polycrystalline diamond drawing die every 24 hours. In 24 hours, the diameter change of polycrystalline drawing die is small, and the change rate of wire diameter is also very small. For the whole production process, the wire diameter compression ratio of each drawing die is relatively stable, and the ratio of input and output is large.
3. Save raw materials. If the wire rod with metal plating on the surface is drawn, the electroplating process does not stop in the process of stopping drawing, which will lead to the thickness of the electroplated coating on the surface of the wire rod being electroplated. When starting the drawing again, it is necessary to cut off the thick wire rod, which will cause great waste. The more times of shutdown, the greater the waste. Using polycrystalline diamond drawing die can greatly reduce this waste.
4. Reduce labor intensity. Due to the long service life and slow expansion of polycrystalline diamond drawing dies, it is not necessary to replace the dies frequently, nor is it necessary to pay attention to the change of wire rod size, which greatly reduces the labor intensity of workers. A worker can coordinate 4-5 wire drawing machines in the production process.
Therefore, the polycrystalline diamond wire drawing die is gradually valued in the metal wire drawing industry.