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Stretching tension can be customized non-standard spring tension spring fatigue life is long

by:Yongqiang     2020-12-24
Tensile spring associated standards:
GB/T_1239 [ 1] 。 1 - 2009 _ _ cold roll of cylindrical helical spring technology conditions, part 1: tension spring;
GB / T2087 - 2001 cylindrical spiral tensile spring size and parameters: GB/T 2008 - 1997, etc.

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 Spring constant tensile length X

abstract: closely around the circle, so that it can force and stretched, each side around a loop ( 循环) 。
the following necessary for a stretch of the spring data:
1, free length, total length, long full circle, since the length of hook circles;
2, control the diameter, outer diameter, inner diameter, the inside diameter of casing;
3, steel wire size wire diameter;
4, materials ( Species, grade) ;
5, laps: the total number of turns and right-handed or left-handed;
6, the end of the form;
7, within the hook load;
8, load rate, deflection, every inch of pounds;
9, tensile length. Formula:


spring constant: to k said, when the spring is stretched, each additional load (1 mm distance kgf /毫米)
spring constant formula ( Unit: KGF/mm) :k = ( G*d4) /( 8*Dm3*Nc)
G: module of rigidity of wire; D: wire diameter; Dm: - pitch diameter = diameter Wire diameter; Nc: laps = total number of laps - effectively 2.
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