Springs are mechanical parts that work by elasticity. Parts made of elastic materials deform under the action of external force, and then return to their original state after the external force is removed. Also called "spring". Usually made of spring steel. The types of springs are complex and diverse. According to the shape, there are mainly spiral springs, scroll springs, leaf springs and irregular springs. Although the spring industry is a small industry in the whole manufacturing industry, its role cannot be underestimated.
The country's industrial manufacturing industry and automobile industry should be accelerated, and the spring industry, as one of the basic components, needs an ultra-early development to adapt to the rapid development of the whole country's industry. In addition, the expansion of the scale and variety of spring products and the improvement of the quality level are also the needs of upgrading mechanical equipment and improving the performance of supporting hosts. Therefore, spring products play an important role in the industrial development of the whole country.
Daily necessities industry and hardware industry, including lighters, toys, locks, door hinges, fitness equipment, mattresses, sofas, etc. The demand for springs is the largest in quantity, tens of billions, with low technical requirements and very low price. Generally, they are produced by small spring factories scattered all over the country, which have unique advantages in cost and it is difficult for large spring factories to compete with them.
Therefore, new spring enterprises are born from time to time. In the future, the market demand will increase by 7%~ 10% every year. After China's entry into WTO, the export volume of daily-use hardware products increased significantly, which led to the demand for springs. However, due to the influence of international market demand and trade barriers, the international market has its uncertain side.
According to the mechanical properties, springs can be divided into tension springs, compression springs, torsion springs and bending springs, disc springs, ring springs, leaf springs, spiral springs, truncated cone-shaped scroll springs and torsion bar springs according to their shapes, and can be divided into cold spiral springs and hot spiral springs according to their manufacturing processes. Ordinary cylindrical springs can be made into various types according to the load because of their simple manufacture, simple structure and wide application.
Generally speaking, the spring manufacturing materials should have high elastic limit, fatigue limit, impact toughness and good heat treatment performance. Commonly used are carbon spring steel, alloy spring steel, stainless steel spring steel, copper alloy, nickel alloy, rubber and so on. The manufacturing methods of springs include cold coil method and hot coil method. Generally, the diameter of spring wire by cold rolling method is less than 8 mm, and that by hot rolling method is greater than 8 mm. Some springs must be punched or shot peened after being made, which can improve the bearing capacity of the springs.