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 yqgm@yongqiang-group.com ;sales@yongqiang-group.com

Stretching the spring order double tension spring fatigue life is long

by:Yongqiang     2020-12-22
In a tensile spring heat treatment and quenching process, the cooling speed should be controlled tensile spring products, in order to obtain high and even hardness and enough hardening layer depth, at the same time reduce the deformation and prevent cracking. What is the action of tensile spring quenching:
1, steel hardenability: hardenability is also called the hardenability, is refers to under prescribed conditions, the hardening depth and hardness of the steel sample distribution characterized by material performance. These are the characteristics of steel itself;
2, to stretch the spring products, steel grade requirements for the carbon content is 0. 50% - 0. 75%, manganese element is zero. 50%. Carbon and manganese are affect the hardenability of elements. Due to the domestic steel hardenability band wider, quenching oil cooling rate should be according to the condition of low hardenability choice;
3, fast quenching oil is mainly used for thickness or diameter smaller alloy constructional steel and carbon steel spring. Spring enterprise all hope each heat treatment furnace can deal with more specifications of the spring.

extension spring feature
the spring is under axial tension spring, stretching after pulling force is used to store energy, it will try to back together after open, produce to the force majeure. When not bearing, is between tension spring coil and tight, so tensile spring coiling of the close degree is decided by the initial tension. Its general with stainless steel, piano steel, high carbon steel, phosphor copper, oil tempered alloy spring steel, etc.

testing tensile spring load the Fs, is will spring allowed to carry the load as a test load; Stress, tau s is allowed on the spring loaded big stress as a stress test. But, there will be a deviation in the specific detection, so attention should be paid to the selection of measuring tools and limit deviation of consideration. In addition, on the basis of load measurement, but also pay attention to the spring stiffness measurement, also is the point at which the deformation per unit load change.

pull at the beginning of the spring tension: the tension equal to open to each other at the beginning of spring and circle the required force, tension in the early spring coiling occurs after forming. Torsion spring, because of wire material, wire diameter, spring index, electrostatic, lubricating oil, heat treatment, electroplating, make each tensile spring initial produce uneven phenomenon. The torsion spring, so the installation specification shall be of pretension to slightly apart some distance between each and circle. At this time the force needed to become the initial tension.
initial tension = P - K X l = large load The spring constant tensile length X
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