The toughness of carbon spring steel wire is an important guarantee for making springs and ensuring their service life. Most springs work under bending and torsion stress, especially tension springs. Under different conditions of use, the front end needs to be made of various Shaped shackles, shackles are parts where the force is complicated and the stress is relatively concentrated, and they are also vulnerable parts. If a certain part of the spring is damaged, it may cause the entire equipment to stop operating, especially some high-strength spring steel wires, which are mostly used to make sudden and strong spring elements, which are required to have a higher elastic limit and fatigue limit. To ensure the normal and stable operation of the equipment.
The toughness index of spring steel wire is measured by the number of repeated bending and torsion. In the production process, the bending and torsion have reached the standard for several times, and the steel wire can be determined as qualified if there is no torsion crack in the wire torsion.
