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Plate Rolling Formula

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Plate Rolling Formula

Plate Rolling Formula

windseaker1

(Mechanical)

(OP)

29 Jan 09 18:25

I ran across this formula, but it is only good up to 180Degrees?
(.xrad)x degree of circle

And I beleive this is not true as well: given
Roll-out flat pattern:
OD = 6.375      material .375 steel   
     Cir.  6.375 x 3.  =  20.027
                                 
Formula: (.xR) (180 Degrees)x2 =
         (.x3.) x (180)x2  =
         (.) x 180      x2 =
          10. x2               =
                     20., which is the same as cir.??


A better formula appears to be: but for alum. only??
   (I dont know where the . factor cam from)

(.xR)-(.xT)x(180 Degrees)x2=
(.)-(.)x180x2  =
(.)x180x2            =
9.x2                   =
18.

 But evern better "I hope" is AutoCad's factor formula:
     (for mild steel: A36)
By AutoCAD: using .407 factor Times thickness
             = . of the 3/8
       Then offset from the insideat this factor,
           you get: Length was a total of 19.329"

This seems closer to a real stretch-out pattern!

Can anyone confirm??









 

RE: Plate Rolling Formula

cloa

(Petroleum)

29 Jan 09 19:39

Good for you to supply some specific numbers but what is your situation that you want help with?

RE: Plate Rolling Formula

2

berkshire

(Aeronautics)

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Gypsum making equipment 30 Jan 09 04:44
For a large radius this point, sometimes called the K factor is closer to the middle of the metal thickness. not the inside edge.
Here is a link to a bend program that can be downloaded
http://www.ciri.org.nz/bendworks/bending.pdf

B.E.

the second formula you gave will work with steel if you modify the the (.xt)in your formula,This is the neutral line, the point where the metal neither stretches nor shrinks.For a large radius this point, sometimes called the K factor is closer to the middle of the metal thickness. not the inside edge.Here is a link to a bend program that can be downloadedB.E.

RE: Plate Rolling Formula

windseaker1

(Mechanical)

(OP)

30 Jan 09 11:10

I understand the bending formula quite well, except rolling. Are you say that the bend formula is the same for rolling as well??
This the neutral axis of bending the same as rolling??

RE: Plate Rolling Formula

TheTick

(Mechanical)

30 Jan 09 11:13

(.xrad)x degree of circle =

???

It's not a formula until there's something on both sides of the equal sign.

RE: Plate Rolling Formula

SnTMan

(Mechanical)

30 Jan 09 12:33

windseaker1, what is mostly used for rolling a cylinder from flat plate is the finished mean diameter, pi*(OD-t), or pi*(ID+t). Some add allowance for weld seam shrinkage (1/8" typical), some don't.

Regards

Mike

RE: Plate Rolling Formula

berkshire

(Aeronautics)

31 Jan 09 03:42

windseaker1
Sorry for being late getting back, yes the bend formula works for rolling as well, when you roll a plate you are bending it on a large radius, the metal still has to shrink on the inside of the neutral line and stretch on the outside.To get a finished diameter that you want, you have to compensate by adding or subtracting part of the metal thickness  from the neutral line.
B.E.

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News

Designers, detailers, and fabricators commonly debate the correct formula for a blank length of bent plates.  A trial run is always good practice when forming on a press brake because metals stretch so differently on different setups.

This confusion does not need to carry over into the rolling of plate, since the radius is larger than 3 times the thickness.

The K-factor of a bend is the ratio of the neutral axis to the thickness, so when K = 0.50, the neutral axis is in the exact center of the thickness:  half the thickness compresses and half of it stretches.  On very tight bends, however, the K value changes where the material stretches more than it compresses.

Most of today&#;s 3D CAD software such as SolidWorks or AutoCAD Inventor will &#;unfold&#; a 3D model.  The AutoCAD default K value is 0.44, which is the standard for steel with bend radii of 1 to 3 times the thickness.

For rolled items, however, you should set your software to K = 0.50.

Perhaps this debate still exists because the K = 0.44 is close enough when rolling large radii.

Looking at an example of 1/2&#; plate to 60&#; inside diameter, there is only 3/64&#; difference over a 90deg segment.  The K-value is not as important on large radii, but if you are a stickler for accuracy use K = 0.50 when rolling.

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