Wire drawing dies achieve stretching and shaping through plastic deformation. When a metal billet passes through the die orifice under tensile force, the metal undergoes plastic deformation because the orifice size is smaller than the original billet size, resulting in a smaller cross-section and increased length. The working area of the die is the key part for deformation; its shape and size directly affect the degree and quality of deformation. The sizing zone ensures that the drawn wire has precise dimensions and good surface quality.
Lubricant plays a role in reducing friction, lowering drawing force, extending die life, and improving product surface quality during the drawing process. Die materials are typically hard alloys or diamond to withstand high pressure and friction. Die precision is crucial to product quality; high-precision dies ensure dimensional stability and surface finish.
According to industry standards, wire drawing dies can be divided into two types: single-die wire drawing and multi-die continuous wire drawing. Single-die wire drawing is suitable for coarse wire processing, while multi-die continuous wire drawing is used for fine wire production. Mold design must consider key parameters such as the compression angle (typically 8-12 degrees) and the length of the sizing band (approximately 0.8-1.2 times the wire diameter).
Common problems include mold wear (manifesting as product dimensional deviations or surface scratches) and metal sticking to the mold (leading to product surface defects). Solutions include regular mold inspection, optimizing the lubrication system, and selecting appropriate mold materials.
