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Nested wave springs offer increased force capabilities
TFC has introduced a standard range of nested wave springs from Smalley, available from stock in carbon and 17-7 stainless steel and in sizes from 16-100mm. And if one of the standard sizes does fit your application, Smalley can design you a custom product.
The Spirawave nested wave springs from TFC offer designers a number of benefits, not least of which is two to three times the force of conventional wave springs. Nested wave spring forces increase proportionally with the number of turns in the coil. Compressing a wave spring creates bending, or tensile stresses, which can limit the amount of force the spring can produce without failing or permanently deforming.
It is recommended that the calculated operating stress be less than the minimum tensile strength of the material in static applications and less than 80% of the minimum tensile strength in dynamic applications. Stacking single-turn springs can achieve a higher load, but one nested spring provides the desired load without the complication of stacking multiple parts.
Nested wave springs also eliminate uneven loading. When an assembly demands a stack of single-turn wave springs, they have to be aligned perfectly to prevent binding or uneven loading when compressed. Because nested spira-wave springs are made from one continuous filament of flat wire, coiled in parallel, the layers stay aligned, allowing for consistent loading.
Further, nested spirawave springs are ideal for automated processes. Their study, multi-turn design allows for pick and place methods without the risk of deformation that can occur when a robotic arm picks up a single-turn wave spring. This design has no free ends, making it tangle-resistant, reducing assembly time. Similarly, while single-turn wave spring stacks need to be installed precisely and individually to guarantee proper alignment and repeatability. Nested springs can be easily placed into assemblies, which leads to both time and cost savings.
Now that nested Spirawave springs are a standard series from Smalley, thousands of carbon and stainless steel parts in metric sizes from 16-100mm and imperial sizes from 0.500-4in are available for next day shipment. Non-stock quantities can be available in as little as three weeks.
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