disk springs manufacturing

[Paolo_Shivam]

Hello,
I need to produce a disc spring.
The disc spring is obtained cutting from a sheet the right diameter, internal and external, and then forming into a hollow conical type disk who has different inner and outer diamater.
As you know, the spring diameters (inside and outside) have very low tolerances, ranging from 0,12 mm to 0,63 mm depending on the diameter.
These tolerances regard the FINAL dimension of the spring, but in process what dimensions need to consider (in cutting the sheet when it is flat ) in order to achieve the final tolerances ??? If any reference standard is available please suggest or give any feedback so i can maintain the final tolerances without compromising customer specification.

THANKS
PAOLO

 

[drawoh]

Paolo_Shivam,

Disc springs can be machined in a lathe, which is good when you are doing a one-off.

How many hundreds of thousands of disc springs do you need? The production tooling is expensive.

--
JHG

 

[btrueblood]

If you have a lathe, making a form die set to "stamp" the conical springs from the flat is also fairly trivial...though getting the angle of the form correct to get the final shape of the spring where you want it, after cycling it a few times, is not so trivial.