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Kunshan Spring Spring wire specifications and uses

Date:2017-12-25 Author: Clicks:

Kunshan Spring Spring wire specifications and uses

Spring relies on elastic deformation to absorb impact energy, so the spring wire does not have to have high plasticity, but at least have to bear the plastic forming spring, and enough to withstand the impact of energy toughness.

Springs often work long hours under alternating forces and therefore have high fatigue limits as well as good creep and relaxation resistance.

Spring used in a specific environment, the wire will have some special requirements, such as: the use of corrosive media spring, must have good corrosion resistance. Spring used in precision instruments has long-term stability and sensitivity, low temperature coefficient, high quality factor, small after-effect, and constant modulus of elasticity. Springs operating at high temperatures require that sufficient elastic limits and good creep resistance be maintained even at high temperatures.

In addition, the forming process and the heat treatment process of the spring wire are also considered. Cold-drawn spring steel wire and oil quenched and tempered spring wire are supplied wire directly around the state of the spring, the spring after the formation of the elimination of the direct use. Cold-drawn spring wire tensile strength slightly higher than oil quenching and tempering wire. Large-scale cold-drawn steel wire elasticity is too large, winding the spring is very difficult, so cold-drawn spring wire specifications generally less than 8.0mm, oil quenching and tempering wire specifications generally less than 13.0mm. In fact, the spring diameter 13.0mm multi-use light pull state spring wire, cold drawn around the system after forming quenching and tempering. Steel wire diameter of more than 15.0mm mostly use heating winding system spring.

Spring according to the operating state can be divided into static spring and dynamic spring. Static spring refers to the limited number of active service spring vibration, such as safety valve spring, spring pad, pan spring, scheduled load spring, mechanical spring, watch springs and so on. Dynamic spring refers to the number of vibration of the service period of more than 1 × 106 times the spring, such as the engine valve spring, vehicle suspension spring, shock spring, coupling spring, elevator buffer spring. Tensile strength and stability are mainly considered in the selection of static springs, and fatigue, relaxation and resonance are mainly considered in the selection of dynamic springs.

According to the spring load conditions can be divided into light load, general load and heavy load three states. Light load refers to the static, lower, smaller deformation of the spring, such as safety devices with springs, vibration absorption and other springs. Design life of 103 to 104 times.

General load refers to the design life of 105 to 106 times, the vibration frequency of 300 times / min under the conditions of the ordinary spring. In the allowable range, the life guarantee 1 × 106 times, the lower the load, the longer the life expectancy.

Heavy load refers to long working hours, frequent vibration of the spring. Such as valve springs, air hammers, presses, hydraulic control spring, the higher the load, often less than about 10% of the use of useful life of more than 1 × 106 times, usually 107 times.

Spring selection principle is: first meet the functional requirements, followed by the strength requirements, and finally consider the economy. Automotive interior spring

Carbon spring steel is widely used in spring steel, the largest amount of steel. Steel containing 0.60% ~ 0.90% of carbon and 0.3% ~ 1.20% of manganese, no longer add other alloying elements, the use of relatively low cost. Carbon spring wire by appropriate processing or heat treatment, you can get high tensile strength, sufficient toughness and good fatigue life. However, carbon steel wire hardenability is low, anti-relaxation properties and corrosion resistance is poor, the modulus of elasticity of the larger temperature coefficient (up to 300 × 10-6 / ℃), suitable for the manufacture of small cross-section, the working temperature is low ( 120 ℃>) of the spring.

Alloy spring steel generally contains 0.45% ~ 0.70% of carbon and a certain amount of Si, Mn, Cr, V, W and B and other alloying elements. Alloying elements to improve the spring steel relaxation resistance, improve the toughness of steel, while significantly improving the hardenability of steel and the use of temperature, suitable for the manufacture of larger cross-section, the use of high temperature springs. Electronic spring


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