Die forming with rubber pad

[toranacar]

Hi hope to get some help here, some great article here I must say.
I would like to know what is the formula/calculation to determine what pressure is needed to form mild sheet metal.
I have an interest in pressing fender patch panels approx 24"x24" 1.2mm mild steel.
I’m trying to determine what size press/pressure I need and of course cost. Perhaps even fabricating a press. I could even use several dies to increase the definition of the part if the pressures are not quite enough??
Thanks
Bart

 

[GregLocock]

WAG a 40 ton press for a bed that size. Soft tooling might require higher pressures than hard tooling.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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[toranacar]

Thanks
But I need more specific info, I guess I need to be more specific so what info do you guys need from me in order to get more specific answers? Such as calculations?

 

[MikeHalloran]

For free, you get a WAG. Greg's sounds pretty close.

So find a used machinery dealer and ask him to find you a 40 ton press.
Maybe he can arrange a demo if you have a blank and some tooling to try.
If it's not enough, the same guy can find you a bigger press.

If you want someone to design or customize a press, rent an engineer.
There's a worldwide surplus of them, so they're not expensive these days.


Mike Halloran
Pembroke Pines, FL, USA

 

[toranacar]

Not asking to design a press, just pressure calculation/formula as I want to learn but thanks for your comment anyway.

 

[GregLocock]

You need to talk to stamping tool designers.

http://bandel.com/questions_answers.htm#press

size

gives one approach

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[MikeHalloran]

Your answer, and a lot more, is here:

http://books.google.com/books/about/Die_Design_Handbook.html?id=JDd61NujspYC

Mike Halloran
Pembroke Pines, FL, USA

 

[toranacar]

Thanks guys