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Need Belleville washer advice

Need Belleville washer advice

Need Belleville washer advice

(OP)
Hello all,

We are in the process of manufacturing rifle actions. The firing pin of said actions is driven by a belleville washer stack, rather than the typical helical spring.

We are looking for belleville washers in titanium, but are having some trouble finding them. Any ideas?

Size: 6,2 x 12,5 x 0,5mm free length 0,85mm load approx 298N

We use 31-33 washers per stack.

RE: Need Belleville washer advice

You will get very low load from Ti, it has a low modulus.  Most Ti also has poor fatigue life as well.

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Plymouth Tube

RE: Need Belleville washer advice

0.85mm height compared to 0.5 mm thick gives h/t = 1.7 and this makes an unstable belleville. Most standard bellevilles have h/t << 1. Therefore, if you stack them you may get an erratic behavior. Are you stacking them in parallel or in series or both?

RE: Need Belleville washer advice

As EdStainless says, Ti is generally not too brilliant as a spring. However, Ti-38-6-44 to AMS 4958 is a spring grade. Don't know how it would behave as a belleville.
 

RE: Need Belleville washer advice

Woody,

Without commenting on the appropriateness of this particular belleville spring design, titanium can be a great spring material, capable of mass savings of 50% or more when compared to ferrous materials while achieving adequate fatigue resistance.  I would contact Renton Coil Spring about your requirements (they do flat/belleville springs as well):

http://www.rentoncoilspring.com/aerospace/company/flat_sheet.html

RE: Need Belleville washer advice

If you stack Ti bellevilles in ?series? they nest toghether and endup with large amounts of surface rubbing on each other. Ti galls easily and this could bery quickly lead ot a stuck firing pin, or failure of components in the spring stack.

Nick
I love materials science!

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