The entrance angle is small. In the drawing process, the wire first comes into contact with the entry area of the die core, and the taper angle of the entry area is small, which not only increases the contact area between the wire and the inner hole, and increases the friction force, but also hinders the introduction of lubricant, which makes the drawing process The lubrication effect in the medium becomes worse, which seriously affects the service life of the mold.
However, due to the short working area of the mold in my country, the effective use area in the hole is small, which not only increases the friction and aggravates the wear, but also wastes raw materials and increases the cost of investment.
The sizing area is not obvious. The sizing area is the final link to determine the final size of the wire. The shortness and unevenness of the sizing area will directly affect the final quality of the wire. The short sizing belt is easy to cause the product size to be out of tolerance, and the drawing die is quickly worn out and scrapped. The obvious and straight sizing area can produce high-precision and high-quality wire rods, and is beneficial to reduce wear and greatly increase the service life of the wire drawing die.
