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Collapsing Washers

Artefx

Plastic
Joined
Oct 9, 2019
Morning guys,

I have made a small punch and die tool which punches washers from 3mm thick mild steel.

However i am having a problem where the centre hole goes tapered when the outer hole is pierced.

I am believe this is due to the wall thickness of the washer. It is 14.80mm OD and 8.65mm ID, which only leave a 3mm wall.

Unfortunately the dimensions have to be these sizes for the washer to function.

Is here some trick i dont about to help with this? Can putting a shear angle on the die or punch help?

Any tips would be welcome.

Lee
 

TheBigLebowski

Aluminum
Joined
Sep 9, 2018
Is this a compound tool (Id and Od done in a single hit) or is it two separate operations? How thick is the material? Is there any Pad/spring pressure holding the part flat?
 








 
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