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Thread: Air bending force calculation

  1. #1

    Air bending force calculation

    Hi to all,

    First post here, seems like a great forum

    I need a formula to calculate the capacity to air bend steel plates with a Pirahna.

    I already have a formula to calculate the force required but it has been developped (approximated) for a mild steel application only and I would like one with the possibility to change the material.

    Here's the one I found:

    P = (575*t^2*L)/D

    P : Tons produced by press
    t : Thickness of plate (inches)
    D : Space between contact point on die (inches)
    L : Length of the bend

    Reference: Presse brake forming by W. Earl Peters

    Thanks

    airbending1.jpg

  2. #2
    Technical Fellow
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    Ummm, hate to state the obvious, but why not ask Piranha?
    Last edited by PinkertonD; 06-08-2012 at 05:24 PM. Reason: Sepeeling

  3. #3
    I know the capacity of the machine in tons.

    now I have a custom die that I have to rate the capacity for this specific operation and for differents materials (44W, CHT100 etc)

    I have to produce a chart to state what is the max lentgh of plate that the worker can bend in each thickness.

    ex:

    44W

    Thickness / Max lenght of bend
    1/4 / 12''
    3/8 / 10''
    Last edited by Goingforsound; 06-08-2012 at 05:51 PM.

  4. #4
    Technical Fellow
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    Yes, I got that, but -- wouldn't have Piranha already have gone through those things designing their iron workers around and rate them for different tonnages?

    If I worked for Piranha and was asked to design an iron worker, I would map out all that stuff to form a guide of what might be required of, say, a 20-ton machine. It can 90-degree bend 3/8" 5051 aluminum, 3/16" A36 steel... I'd be very surprised if it hasn't all been done before.

    Soooooo, asking Piranha tech support could save you a lot of work.

    Other than that, I am of no help.
    Last edited by PinkertonD; 06-08-2012 at 07:27 PM. Reason: speeliing

  5. #5
    For future reference, I found this online calculator. And I emailed Piranha and an engineer sent me the link to the very same calculator.

  6. #6
    Technical Fellow
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    Ummm, kinda what I kept saying? No?

  7. #7
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by Goingforsound View Post
    For future reference, I found this online calculator. And I emailed Piranha and an engineer sent me the link to the very same calculator.
    No equations with the related calculator.... Wish they published the math, or did I miss it?

  8. #8
    No you didnt miss it. Nothing is published :(

  9. #9
    Associate Engineer
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