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A compression spring offers resistance
to the axial compressive force. It is an open-coil
helical spring. They are generally coiled as constant
diameter cylinder.
Common forms: - Conical,
Concave (barrel), Convex (hourglass) and various combinations
of above.
The space allotted will decide
the allowable solid height, inner diameter and outer
diameter of compression springs. Along with the load
and deflection, the dimensional limits will decide
the stress level. Therefore to avoid any design changes,
sufficient care should be taken to decide allotted
space.
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Round wire is preferred over square, rectangular
or some special section because of its easy availability Coiling
operation produces stress so compression springs must be stress
relieved.
Spring Materials
Common spring materials include stainless steel, alloy steels,
carbon steels and some non-ferrous materials. IIS also produces
spring from Exotic material like Inconel, Monel, Nimonic,
Hastelloy etc.
For spring design, selection of material
is one of the important steps. Types of material available,
mechanical and electrical properties, operating conditions
are few points of prime importance for material selection.
In case of heavy stress cycles, a tight control is required
in material quality. Scratches, seams and other such flaws
affect fatigue life considerably. Carbon steel and alloy
steel give optimum service and heavy stress cycles.
Stress Relieving
To relieve the harmful residual stresses, heat treatment
of springs is done. Depending upon the type of spring, material,
furnace and operating conditions, time and temperature will
vary accordingly.
Stress relieving causes
dimensional distortion so manufacturer should predict the
change to achieve required dimensions. Forming should immediately
follow stress relieving.
IIS has automatic spring
coilers upto 8.0mm wire diameter. From 8mm to 22mm we have
semi-automatic cold coiling machines. From 22mm onwards
we have hot coiling machines
WE have load testing
machines upto 100tons and we can test deflections upto 4
feet. Our automatic grinders can produce parallelism within
0.05mm and surface finish in microns.
WE have more than 25
years experience in the manufacturing of Compression springs.
We can manufacturing
compression springs of any size, length and dimension you
can think of. We have manufactured compression with OD of
650mm and length 6meters.
Tolerances are as
per IS 7906 or DIN 2095
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