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Wire drawing dies’ hole shape comparison between China and abroad

“Somebetter” wire drawing dies are popular all over the world.

Next, we look at the Wire drawing dies’ hole shape comparison between China and abroad.

The China domestic drawing die has the following characteristics and has been improved:
① The entrance angle is small. Because the wire first contacts the entrance area of the die core in the drawing process, the cone angle of the entrance area is very small, which not only increases the contact area between the wire and the inner hole, increases the friction but also prevents the introduction of lubricant, which makes the lubrication effect of the medium in the drawing process worse, and seriously affects the service life of the die.

Foreign wire drawing die products increase the import angle, effectively avoid the scratch between the wire drawing die and the wire drawing dies, introduce more lubricants, improve the lubrication effect, and reduce the die core’s wear. This change improves the wire rod’s surface quality and the drawing die’s service lifesaving die.

② The working area is short. Compared with domestic drawing dies of the same specification, the working area of foreign drawing dies is generally much longer. The longer working area is conducive to the reduction and uniform distribution of friction in the drawing process, reducing the wear of the drawing die’s inner hole and improving the drawing die service life. The long, narrow working area can reduce the gap between the drawing and the wire drawing die. Under high pressure, more lubricant can be forced into the middle and inner holes of the wire drawing to produce better lubrication pressure. In the drawing process, the inner hole’s temperature is lower, the drawing force is reduced, and the metal flow is more uniform, which is conducive to improving the drawing speed and surface quality. In addition, this type of work area design prevents lubricant from flowing out of the inlet end of the drawing die. However, due to the short working area of the die and the small effective use area in the hole, the friction and wear are increased, the raw materials are wasted, and the cost is increased.

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