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How to Use Disc Springs

Posted On : Dec-08-2012 | seen (844) times | Article Word Count : 481 |

Disc springs, also known as Belleville washers, are slightly conical washers that come in varying sizes, tensions, materials, etc.
Disc springs, also known as Belleville washers, are slightly conical washers that come in varying sizes, tensions, materials, etc. The common characteristic that they share, their conical shape, gives them a slight spring that applies a constant tension in a continuous arc to a connection. The disc spring design allows them to be stacked in tandem as well as stacked in reverse for greater load deflection. When you are choosing a Belleville washer for your specific project, there are a number of factors to keep in mind to find the right washer or combination of washers.

Torque of a Belleville Washer

A disc spring’s torque is the force needed to flatten or begin to flatten a disc spring against the connection. If too little torque is applied, the disc spring will not apply clamping pressure to the connection, and it will not be serving its purpose within the machinery. To decide what torque you need in your Belleville washer, you need to know what the torque of the bolt that you are using is. For a bolt, the torque is the amount of force needed to just start to warp the threads. The torque of the bolt should be the same as the torque of the washer for the best results.

Diameter of a Disc Spring

The diameter you need in your disc spring needs to be carefully measured. The clamping pressure of a disc spring is exerted through its cup perimeter, and if this extends over the connection by even a few millimeters, the Belleville will be significantly less effective at applying force to the connection. Some people may try to correct this on their own by placing an oversized washer beneath the disc spring, but rather than applying force to the connection, the disc spring bends the washer instead. Because there is no substitute for having the right diameter in a Belleville, you should consult an engineer about the best disc spring design for your project if you are not sure what size you need.

Belleville Finish

Just like other washers, Bellevilles have a standard finish that is appropriate for use in most conditions, but there are other finished designed to work in certain environments. Some issues you may have to watch out for are environments with heavy fumes, liquid chemicals, or extreme temperatures. High temperature disc springs are created from highly ductile nickel alloys with high fatigue strength. High temperature disc springs may be used in hotter environments whereas a standard finish disc spring may be compromised.

If you are unsure of what kind of Belleville washer you need for your project, contact an engineer at a Belleville manufacturer to help you determine the proper diameter, torque, and finish. If an engineer can’t find the right Belleville for your project, he can often design a custom Belleville for you instead.

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Keywords : disc spring design, High temperature disc springs,

Category : Reference and Education : Reference and Education

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