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Flat Patterns are wrong

Question asked by Paul Woolner on Dec 19, 2012
Latest reply on Dec 19, 2012 by Paul Woolner

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I am having problems with Flat Patterns, I use lofted bends but I am not sure if this is best, I draw a lot of pipe spools that we have cut on a tube mill laser all of the flat patterns I create from parts are always wrong, I have to fudge the pipe diameter to get them close to the target circumference.

I am looking for a contestant way of creating flat patterns that are the correct circumference of the pipe I have drawn,

I have tried sketch on the OD ID and on the mean line, I do have to leave .5 mm out of the circumference to use the lofted bend but this should be nominal when it comes to the correct size flat pattern.

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Bjorn Hulman Dec 19, 2012 10:51 AM

What bend allowance are you using?

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Paul Woolner @ Bjorn Hulman on Dec 19, 2012 10:58 AM

I use K factors, this one is 2mm thick so I use 0.341 none of that seems to work in a lofted bend.

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Bjorn Hulman @ Paul Woolner on Dec 19, 2012 11:13 AM

This might be of interest

https://forum.solidworks.com/message/71834

The k factor your using might be more suitable for press break scenarios. Is there any documentation for your machines?

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Paul Woolner @ Bjorn Hulman on Dec 19, 2012 11:23 AM

No, these parts are cut from tube, the flat pattern length has to be the circumference of the tube, which is post processed and turned in to a rotative value that the machine uses, I have no trouble with sheet metal parts made with press brakes just these damn flat patterns they use on the tube mill,

I have found by fumbling around with the part that to get close, the K factor needs to be set to the maximum which is 1 and the gap I use in the geometry need to be as small as possible.

But thanks any way.

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4 Replies

Bjorn Hulman Dec 19, 2012 10:51 AM
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What bend allowance are you using?
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- Paul Woolner @ Bjorn Hulman on Dec 19, 2012 10:58 AM
  Mark Correct
  Correct Answer
  I use K factors, this one is 2mm thick so I use 0.341 none of that seems to work in a lofted bend.
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  - Bjorn Hulman @ Paul Woolner on Dec 19, 2012 11:13 AM
    Mark Correct
    Correct Answer
    This might be of interest
    
    https://forum.solidworks.com/message/71834
    
    The k factor your using might be more suitable for press break scenarios. Is there any documentation for your machines?
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    - Paul Woolner @ Bjorn Hulman on Dec 19, 2012 11:23 AM
      Mark Correct
      Correct Answer
      No, these parts are cut from tube, the flat pattern length has to be the circumference of the tube, which is post processed and turned in to a rotative value that the machine uses, I have no trouble with sheet metal parts made with press brakes just these damn flat patterns they use on the tube mill,
      I have found by fumbling around with the part that to get close, the K factor needs to be set to the maximum which is 1 and the gap I use in the geometry need to be as small as possible.
      But thanks any way.
      Like • Show 0 Likes0
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Flat Patterns are wrong

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