1. How to Choose the Spring Material?
Current situation of spring industry in China
For spring industry, it has formed the passive situation of the low-grade ordinary spring
oversupply and shortage of high-end products (high intensity, high stress, heterosexual parts,
and specialty materials) over the long time. At present, the production of spring industry in
China has become saturated. Experts estimate that our spring annual production capacity
has reached 4 billion now, all kinds of spring products are available for 21 categories, more
than 1600 varieties. There are mainly valve springs, suspension springs, diaphragm spring,
shock absorber spring, hydraulic spring, oil pump springs, disc springs, high temperatures
and spring, circlip, extension spring, torsion spring, compression spring, scroll spring as well
as special springs. At this stage the spring products are mainly low-tech general spring,
heterosexual piece and sectional products and other high-tech products can only produced
by a small number of large-scale factories. Spring industry develops relatively fast during
"The Eighth Five", "The Ninth Five", especially develops rapidly in Shanghai, Tianjin,
Guangzhou, Changchun, Chongqing and other areas, which also have different levels of
development in other regions, in general is better than any other industry. From the present
situation, cars, motorcycles, scooters, internal combustion engine, electrical, instrumentation
develops the development of these industries will lead the spring industry's development.
Spring material selection depends on the desired characteristics
The spring material selection depends on the desired characteristics. The factors to be
considered are the creep resistance, the load, the fatigue limit and resistance to chemical
corrosion. Acetyl polymers are the most commonly used material. The other available
materials and their characteristics are as follows: Polyethylene and polypropylene are
inexpensive, but poor stretch recovery, and poor creep resistance. They can only be used for
short-term load, its fatigue response is medium, good chemical resistance. Acyl copolymer is
more expensive, continuous load characteristics, and good creep resistance, but it is not
suitable for working in the acidic environment of less than 4PH value. Linear sulfide is more
brittle than the acetyl copolymer, which is more suitable for high load and small displacement
of the application. It has good creep resistance, and good fatigue resistance, and can
maintain its toughness at high temperatures. It can normally work when long term exposed
under chemical erosion conditions. Nylon is more wear-resistant under dry conditions, but
when it is exposed at 50% relative humidity, its rigidity decreases by 25%.
Factors that impact the spring performance

2. For simple, occasionally used spring, the choice of ABS is suitable, but the creep resistance
is poor. The filler used in the materials can improve spring characteristics. Fill glass fiber in
the material increases the rigidity and strength, but the deflection is restricted. The ambient
temperature also affects the performance of the flat spring. Most plastic has the best
characteristics at room temperature, the higher the ambient temperature, the closer the
spring material to the softening point. Further, to consider the problem of the anti-UV. If the
plastic spring is installed inside the product, or installed in the dark, it can avoid the problem
of aging caused by ultraviolet radiation. Those outdoor use products, such as garden tools
and sports equipment, ultraviolet radiation can damage the spring efficacy. In this condition,
you must determine whether the selected material can work under the UV exposure based
on the material's resistance to ultraviolet typical data.
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