Tension at the beginning of the spring tension: initial tension equal to that required to pull against each other in the spring and circle, 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
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.
tensile spring design parameters:
indicate the material diameter (
d)
, outer diameter (
D)
The presidents (
Ho)
The work world (
n)
, the location and shape of earring, load (
我p p 1 p 2……)
And the corresponding value (
H1H2……Hj）
If there is early tension, as shown in figure, is on the Po.
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
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