When the steel wire is drawn, due to the friction between the wire and the mold, it is easy to show a complex state of stress, which causes uneven distribution of internal deformation of the steel wire. This uneven distribution is observed from a mechanical point of view, which is manifested as an uneven stress distribution. It increases the resistance to deformation of the product, makes it difficult to deform the product, makes it difficult to shape the product, and increases the difficulty of production; secondly, the additional stress that is easy to generate, after the external force is eliminated, there is still a certain amount of residual stress in the metal. Residual stress, the vectors of these residual stresses are multi-directional, generally divided into two categories:
One is the tensile stress of the surface metal;
The second is the compressive stress inside the wire.
Under the condition of understanding, these two kinds of stress are balanced with each other, which is manifested in the integrity of the steel wire and the good properties of mechanical properties. When the steel wire is twisted, under this kind of stress, different results will appear, manifested in the number of twists and whether the twist is split or not.
