• 2023-04-07
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How is the drawing die manufactured

After the drawing die is installed and adjusted, qualified workpieces can be produced normally. This process is called mold service. In general, we always hope that the mold can have a long enough service life to meet the actual needs of production. However, there may be some defects in the manufacturing process of wire drawing die, or some defects will gradually appear in the use process, such as micro cracks, slight wear, deformation and so on. In this case, the drawing die can continue to work despite the danger. This defective but not incapacitated state is called mold damage.

The drawing mold is damaged for some reason, or the mold damage accumulates to a certain extent, causing the mold damage and unable to continue to use, which is called mold failure. In production, when the main working parts of the mold are damaged and the qualified workpiece can not be rushed out, the mold is considered to be invalid. The failure modes of stamping die are generally plastic deformation, wear, fracture or cracking, metal fatigue and corrosion.

Drawing die

The failure of wire drawing die can be roughly divided into two categories according to the occurrence time: normal failure and early failure.

Wire drawing die usually refers to a variety of metal wire drawing die and fiber drawing die. All wire drawing dies have a hole in the center of a certain shape, round, square, octagonal, or other special shape. As the metal is pulled through the die hole, the size decreases and even the shape changes. When drawing soft metals such as gold and silver, a steel die is sufficient, and the die may have multiple holes of different diameters. Steel wire drawing is usually made of hard alloy die. The structure of the drawing die is a cylindrical (or slightly conical) hard alloy core that is tightly embedded in a circular steel sleeve. The inner hole of the core has an Angle hole, an entrance cone, a deformation cone, a sizing belt and an exit Angle. When drawing copper, aluminum and other non-ferrous metal wire, wire drawing die similar to steel wire die is often used, but the shape of the inner hole is different. Fine line can be used polycrystalline mold (artificial diamond) or natural diamond wire drawing mold.

Annealing of wire drawing die: the annealing mode is generally electric contact type. Electricity through the annealing wheel (contact wheel) will introduce large current evenly into the copper wire, copper wire preheating and heating. Preheating is heating the copper wire. The temperature of oxidation is generally about 250 degrees; Heating is the process of heating copper wire to an annealing temperature, generally 500 to 550 degrees, to recrystallize it. The heating section of the wire drawing die is protected by steam to prevent the copper wire from oxidizing, and then cooled with water to complete the annealing (softening) process.