Sheet metal Spring, Force to Compress To a smaller Diameter 2

[Zibraz]

I'm struggling to determine the force to reduce this sheetmetal spring to Ø17.8mm.

If someone could point me in the direction or give advice, that would be great. I can find alot about normal wire springs, but can't find much for a sheetmetal spring. The spring is 0.6mm thick and 10mm long.

Thanks!

 

[mfgenggear]

Op
How many, quantity?
Low volume 10 pcs, or 10000 parts.
This is a great brain teaser.
My thoughts and opinion.
Thus a very small part. I would first of make a new design.
OK but if you are set on this.
It will require developing.
Trial and error to allow for spring back.
A two or three stage die. Reason the leg
Pushed into the center.
Create the two small bends on b each end.
Then the large radii
Then bend the inner leg.
Depending on hardness, or tensile strength.
For small lot a small fixture with removable pins. Similar use for bending tubing.
HTH

 

[GregLocock]

@rothers was that a non linear contact analysis? Please could you plot the contact force?