Installation Recommendations for Disc Spring Stacks
Disc orientation when assembling, is important to guarantee a
correct functioning of the stack and its long life. Basically the
disc which is in contact with the edge has to be held by its outer
edge. This reduces contact pressure, as the same force is acting
over a bigger surface. That reduces the possibility of contact
areas cracking. If the number of discs used is not even, the disc
which will be held by its outer edge is the one on the side where
the force is occuring.
Guide hardening and leaning
Other factors to take into account are that the guide axis must be
polished and hardened (if possible achieveing a minimum hardness of
48 HRc). Hardnesses asigned to surfaces where the springs
will lean, must always be greater than the harnesses of the
springs (43-44 HRc).
Clearence between guides
This value (differentiates between the interior diameter and the
guide axis), its established using experience. Respecting this
value outcomes in a correct spring guidance producing an ideal
contact between the springs in the stack. Furthermore its is also
helping histeresis of the spring package aswell as preventing the
buckling effect of the whole set. This is important to determine
stack life span.
Another factor which influences directly the vertical stablility of
the stack, aswell as the previously mentioned guidance, is when the
stack has a long length. The total height of the stack can't be
greater than three times the exterior diameter of the springs. If
that length should be surpassed, flat washers should be placed.
This is done to prevent the buckling effect.
Another important feature is the lubrication of the springs. It has
a direct influence over the wear of the set. In spite of some
springs having already a surface treatment using zinc phosphate to
protect them from corrosion and as a form of lubrication, it is
still recommended to apply lubricating grease for a better
functioning of the material.
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adecuación de estas recomendaciones en su caso concreto.