4 Advice to Choose a metric belleville disc springs

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.

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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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Using Disc Springs in Series and Parallel

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.

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