- Aug 08, 2017 -
The coil spring is the most widely used spring in mechanical springs and is named by the metal wire in a spiral shape. National standard "GB1239-1976 ordinary coil spring" for cold rolled and hot rolled, compressed, stretched, twisted circular cross-section material cylindrical spiral spring, its diameter is generally 0.2-50mm. According to the provisions of the standard, round cylindrical material cylindrical spiral spring is divided into three forms: spiral compression spring, spiral tension spring and helical torsion spring.
According to the characteristics of the structure, can be divided into cylindrical coil spring and variable diameter coil spring two categories; variable diameter coil spring is mainly subject to compression Load, according to its shape characteristics can be divided into conical, spiral, concave and convex. Spiral Spring Among the above types of springs, the cylindrical compression coil spring is the most widely used circular cross-section material of circular cross-section material.
In the production and use, the coil spring can also be formed by the method and the diameter of the material is divided into different: large coil spring and small spiral spring two types, Spiral Spring the former is usually hot forming, which is cold forming. Material diameter from 8MM to 85MM (or even to 100), each spring carrying tens of tons of people called large coil spring. Spiral Spring The use of this thermoformed spring is the most common use in the general machinery, for example: steam safety spring, marine engine coil spring and a variety of automotive suspension coil spring, material diameter of 8 to 18.5 MM, which is the smaller thermoforming coil spring. Rail bolts and axle springs for railway vehicles, with a material diameter of 9 to 60 mm; and engineering machinery, especially the rear seat (recoil) coil springs used for bulldozers and rollers, 75MM, which is used under some high stress large coil spring.
There are many types of cold-formed small coil springs. For example, Spiral Spring the Japanese spring industry standard is abbreviated as "JSMA No.7-1979" practical small compression coil spring ", the diameter is 0.2 to 3.2MM, the outer diameter is 2-36MM There are 230 kinds of range, JSMA No.8-1972 "practical small stretch coil spring", the diameter of 0.2-2.0MM, circle diameter in the range of 2-20MM there are 212. DIN2008 in Germany cold forming Compressed spring wire diameter in the range of 0.1 to 10MM. Spiral Spring Britain and the United States and other countries often use 0.5 to 12.5MM diameter of the material manufacturing cold forming small spring spring.China's spring industry standards, cold forming coil spring material diameter of 0.2 to 8MM.
Compared with other types of springs, the coil spring has the following advantages:
1. Precise regulation performance. That is, Spiral Spring the relationship between force and displacement is very sensitive;
2. Good softness, that is, the range of deformation is relatively wide;
3. manufacturing easier;
4. The structure is relatively compact;
5. High energy rate.
The coil spring combines the above advantages, while other types of springs are not available. For example, although the torsion bar precision adjustment performance, but the soft performance is poor; leaf spring has a good soft performance, but poor precision adjustment performance. The precision adjustment of the coil spring is due to its almost no friction and damping results. If the damping is an important factor to consider, Spiral Spring it is appropriate to use a plate spring, ring spring or disc spring. It should be noted that, as far as possible, the coil spring is used as a compression spring, and should not be used as a tension spring, no matter what occasion.
Circular crossings Wire or rods used to make coil springs are better than those made with rectangular cross-section materials (except in special cases). Because it is difficult to obtain a normal rectangular or square cross-section material, the cross-section material is in fact not equilateral quadrilateral (trapezoidal), Spiral Spring and such material is unlikely to be ground. The advantage of a rectangular cross-section spring is that it can get a larger volumetric efficiency than a circular section, and the radial direction is not easy to bend.