The meaning of each item in the above formula is:
G = shear modulus of elasticity [MPa, psi] (G value size: steel wire 8000, stainless steel 7200)
d = wire diameter [mm, in]
n = number of active turns [-]
D = center diameter [mm, in]
k = spring rate [N/mm, lb/in]
This formula is the calculation formula of the spring stiffness. The stiffness multiplied by the working stroke is equal to the working force of the spring.
Through the above formula, we can conclude that the parameters of the compression spring must be composed of: material, wire diameter, center diameter, effective number of turns, total spring length, working height, and required strength. If there is no special requirement for the force of the spring, the parameters of the working height of the spring and the required force may not be provided.
It is composed of parameters such as material, wire diameter, center diameter, effective number of turns, total spring length, working height, and required strength. If there is a requirement for strength, the elastic force needs to be calculated specifically.
1. When the free length and stiffness of the compression spring are known, the calculation formula of the load at a certain working length is as follows:
P=RxF
P refers to load (lbs): R refers to spring rate (lb/in):
F is the amount of deformation from the free length.
Example: Given a free length of 0.750 inches and a spring rate of 22 lbs/in, with a working length of 0.500 inches, P = 22x(0.750 - 0.500) = 5.5 lbs.
2. How to Calculate Stiffness—Spring stiffness refers to the load that causes the spring to deform per unit, and can be tested by the following steps:
1> When the spring deformation is about 20% of the larger deformation (the free length is hidden and the height is removed), measure the spring load (P1) and the spring length (L1).
2> When the spring deformation does not exceed 80% of the larger deformation, measure the spring load (P2) and the spring length (L2). It is important to ensure that any two spring coils (except the closing cuff) are
No contact took place.
3> Calculate stiffness (R) (lb/inch) R=(P2-P1)/(L1-L2)
