How to select wire drawing dies for different wire?

1. According to the hardness of the wire

- Hard wire: wire with high hardness such as high-strength steel wire and alloy steel wire, polycrystalline diamond (PCD) mold should be selected. PCD hardness is with very high, strong wear resistance, which can withstand the wear caused by high hardness wire, to ensure the life of the mold. Such as drawing high-strength steel wire for aviation, the PCD mold can maintain a stable drawing effect and avoid excessive wear of the mold.

- Soft wire: For aluminum wire, copper wire and other soft wire, cemented carbide mold can meet the requirements. This kind of mold has low cost, and its hardness and wear resistance are enough to deal with soft wire drawing, and the cost performance is higher. For example, in the daily production of wire and cable, pull aluminum wire, copper wire, carbide mold is widely used.

2. According to wire diameter

- Thin wire: Drawing thin wire with a diameter of less than 0.5mm, such as enameled wire in the electronics industry, wire drawing before optical fiber prefabrication rod coating, etc., has high requirements for mold accuracy and wear resistance. At this time, a high-precision PCD mold should be selected, which can ensure the consistency of wire diameter and surface finish, and meet the high quality requirements of thin wire.

- Thick wire: thick wire with a diameter greater than 3mm, such as steel bars for construction, thicker aluminum rods, etc., when drawing the mold to bear large pressure, you can choose cemented carbide mold or larger size PCD mold. Carbide die low cost, can withstand greater pressure; Although the large size PCD mold costs high, but good wear resistance, long life, suitable for large-scale production.

3. According to the shape of the wire

- Round wire: conventional round wire drawing, according to the hardness and diameter of the appropriate mold can be selected. General soft round wire selected carbide, hard round wire selected PCD.

- Special-shaped wire: such as flat wire, hexagonal wire and other special-shaped wire, the mold force is complicated when drawing, and the mold with good wear resistance and impact resistance should be selected. PCD mold is more suitable, because of its high hardness, strong wear resistance, can better cope with the complex wear and stress in the drawing process of special-shaped wire.

4. Consider the wire surface quality requirements

- High surface quality requirements: For wire with extremely high surface finish and accuracy requirements, such as wire with precision electronic components and wire with high-end jewelry, PCD mold is required. The high wear resistance and high precision of PCD mold can ensure the surface quality of wire and reduce surface defects.

- Ordinary surface quality requirements: For wires with low surface quality requirements, such as general construction wires, ordinary electrical connection wires, etc., cemented carbide molds can meet the needs and have a low cost.

5. According to drawing process parameters

- High-speed drawing: When the drawing speed is fast, the mold wear is intensified, and the PCD mold with good wear resistance should be selected. In the high-speed drawing production line, the PCD mold can adapt to high-speed friction and maintain stable performance.

- Low speed drawing: When drawing at low speed, the mold wear is relatively small, and the cemented carbide mold can meet the requirements, especially for small batch production or cost-sensitive production scenarios.

In short, the selection of wire drawing die should comprehensively consider the hardness, diameter, shape, surface quality requirements and drawing process parameters and other factors to achieve the best drawing effect and economic benefits.