Core characteristics and classification of special-shaped wire drawing dies

Material Properties
Cemented carbide: represented by tungsten cobalt alloys, hardness reaches over HRA90, wear resistance is 3-5 times higher than tool steel, suitable for high-strength metal processing.
Natural/synthetic diamond: Vickers hardness reaches over 10000HV, wear life can reach 50-100 times that of cemented carbide, but the cost is higher, mostly used in micro-fine wire (diameter <0.05mm) processing.
Polycrystalline diamond (PCD): combines the high hardness of diamond and the toughness of cemented carbide, impact resistance is increased by 30%, suitable for difficult-to-process materials such as stainless steel and titanium alloys.
Structural Classification
Sizing zone: the length is usually 1-1.5 times the diameter of the wire, surface roughness needs to be ≤Ra0.1μm, which directly affects the dimensional accuracy of the product.
Compression zone: the angle design needs to match the material elongation coefficient, for example, the copper material compression angle is 16°-18°, and the compression angle of brittle materials such as tungsten wire needs to be reduced to 12°-14°.
Special cross-section design: includes hexagon, ellipse, flat, and special-shaped grooves, some molds need to integrate multi-stage variable diameter structure to achieve complex cross-section forming.