The potential combinations of disc springs depend on function and desired force.
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Having springs working in tandem is always a challenge, but not when it comes to disc springs.
This type of spring is designed to work together, and the potential combinations for disc springs depend entirely upon the project.
It is extremely important to ensure accuracy in stacking the disc springs. You can do it using either the inside diameter or the outside diameter.
When you stack disc springs, the spring constant, force and travel are changed, depending on the combination.
Which type of disc spring stacking - should I choose?
It depends what you want to get out of your stacking:
- Parallel stacking: Gives greater force - 1 times travel but x times force depending on the number of disc springs on top of one another.
- Series stacking: Gives more travel - 1 times force but x times travel depending on the number of disc springs set against one another.
In series-parallel stacking, there must never be a difference in the number of disc springs per bundle. If a bundle has 1 disc spring less than the other bundles, this bundle will naturally not have the same strength, and will therefore become deformed and broken before the other bundles.
For more information, please visit disc springs stack.
You can expect a loss of force when you use several disc springs together in parallel stacking due to the friction.
Our disc spring fabrication is subject to exacting manufacturing and quality control standards. Materials used are generally in annealed condition and hardened to within a range of Rc 44-51 depending on material thickness. The standard material for Century Spring’s disc springs is high carbon C- for general use at room temperature. All discs are preset so that they will not significantly relax under load over time.
Disc springs are used singly or in stacks to achieve a desired load and travel. In general, they function best under conditions requiring very high load in confined space or short travel. Under these constraints, it is often not practical or even possible to use a coil spring.
Century Spring also offers pre-stressed disc springs specifically sized for use with bolts (see part numbers beginning with “CDS”). The primary function of the disc in this application is to create a constant bolt load in bolted assemblies. Load compensation for differential expansion due to heat or dissimilar metals such as electrical connection bolting, or in wear situations, or when “torque- setting” is required are good examples of disc spring use.
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As a means of increasing the deflection or the load, disc springs can be used in series or parallel, or in a combination of series and parallel as shown in the figures on on the right. Deflection for a stack in series of identical discs is equal to the number of discs multiplied by the deflection of one, while the load is equal to the load carried by one disc. When the discs with an h/t ratio greater than 1.3 are used in a stack, the loaddeflection curve will be erratic as some discs will invert through the flat position.
In disc spring stacks, particularly those with parallel units, friction should be considered. Sliding friction is created at the disc’s adjoining, moving surfaces. As a result, the deflection which occurs when loading a stack of discs will lag as the stack is unloaded (hysteresis). This characteristic may be taken advantage of in shock or oscillatory loaded systems needing damping.
If you want to learn more, please visit our website High Temperature Disc Springs.