HELICAL SPRING : TERMINOLOGIES AND IT’S STUDY

HELICAL SPRING: BASIC TERMS AND NOTATIONS

Helical Spring ,either Compression or Extension , shows a lot of applications in Mechanical ENGINEERING.

Before knowing the stresses and deflections in Helical Spring, its important to know basic terms and notations used for Helical Spring.

TERMINOLOGY:

A basic Helical Compression Spring (HCS) diagram is shown below :

NOTATIONS:

p= Pitch of the Spring Coil

d= Wire Diame2ter

D= Mean Coil Diameter

Di= Inside Coil Diameter

Do= Outside Coil Diameter

** Mean Coil Diameter = Average of Inside Coil Diameter(Di) and Outside Coil Diameter(Do).

D= (Do+ Di)/2

** An important parameter used in design of springs developed to be Spring Index ©.

Spring Index © =(Mean Coil Diameter)/(Wire Diameter)

C = D/d

SIGNIFICANCE OF C :

C (SPRING INDEX) represents the relative sharpness of the Curvature of the coil.

RANGES OF C :

1) C❤ : High curvature sharpness. Due to this, stress concentration occurs.These springs very difficult to make , and also special care taken in order to avoid spring failure.

2) C>15: Coil Diameter observes large variation in values. These springs become more prone to Buckling(sudden change in shape) and also has risk of Tangling(mixing up weirdly).

3) 4<C<12 : Optimum range of C for spring manufacturing process.

4) 6<C<9: Optimum range of C for spring manufacturing process for close tolerance springs and for cyclic loading induced springs.

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