Due to the friction between the steel wire and the steel wire drawing mold, it is easy to present a complex stress state, resulting in an unequal position of the deformation distribution in the line, and an uneven distribution state. From the mechanical table, the stress distribution of the fastener connection increases the resistance to deformation. , It makes it difficult to deform the product, which makes it difficult to shape the fasteners and increases the difficulty of production. Secondly, it is easy to generate extra pressure. After the external stress is eliminated, residual stress still exists inside the metal, that is, residual stress. The vectors of these residual stresses are multi-directional, and are generally divided into two categories:
First, the tensile stress of the surface metal;
The second is the compressive stress inside the wire.
It is understood that these two stresses are balanced with each other, which is reflected in the integrity of the steel wire and good mechanical properties. When the fastener is twisted by the steel wire, under this kind of stress, different results will be produced. The performance is the amount of twist, whether the twist is split or not.
