HELICAL SPRING

HELICAL SPRING

The helical spring are made up of a wire coiled in the form of a helix and in primarily intended for compressive or tensile load .The cross-section of the wire from which the spring is made may be circular ,square or rectangular.The two forms of helical springs are compression helical spring & torsion helical spring.

The helical spring have following advantage .
1. The are reliable .
2. These are easy to manufacture .
3. These have constant spring rate.
4. These are available in wide range .
5. These performance can be predicted more accurately .

Material for helical spring 
The material of the spring should have high fatigue strength ,high ductility ,high resilience and it should be creep resistant . It largely depends upon the service for which they are used severe service , average service or light service.

Severe service - severe service means rapid continuous loading where the ratio of minimum to maximum load is one-half or less , as in automotive valve springs .

Average service - average service includes the same stress range as in severe service but with only intermittent operation .as in engine governor springs and automobile suspension springs.

light service - light service inculdes springs subjected to loads than are static or very infrequently varied . as in safety valve springs. 

TERMINOLOGY OF HELICAL SPRING 

The main dimensions of a helical spring subjected to compressive force . They are as follows  .

          d    = wire diameter  of spring (mm)
          Di  = inside diameter of spring coil (mm)
          Do = outside diameter of spring coil (mm)
          D   = mean coil diameter (mm)

Therefore ,
                      D 1 + D 2
          D =    ----------------
                             2

DESIGN OF HELICAL SPRING 

There are three objective for design of the helical spring.

1. It should posses sufficient strength to withstand the external load .
2. It should have the required load-deflection characteristic .
3. It should not buckle under the external load .



This artical was taken by  v b  bhandari & r.s. khurmi ,j.k. gupta .



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