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puzzled1-Visitor
1-Visitor
August 8, 2014
Question

is it a bug?

  • August 8, 2014
  • 35 replies
  • 11301 views

Whenever i create a die/punch form on sheet metal...its weight increases then normal sheet. I dont understand how the weight increases than original sheet? either it can go constant or decreases i guess? Please correct me if i am going wrong!!!


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35 replies

rohit_rajan15-Moonstone
15-Moonstone
August 8, 2014

the overall length of your plate remains the same...the punch or die you add just adds extra material.

that is the reason the weight increases.

puzzled1-VisitorAuthor
1-Visitor
August 8, 2014

But it shouldnt be like that...we create a punch or die from the exissting sheet!!!...Anyway to overcome this?

rohit_rajan15-Moonstone
15-Moonstone
August 8, 2014

jehan that you do practically...but in proe that is not the case...

in proe the punch you add becmoes the extra material.

i don't think modeliing software would have a solution...

dgschaefer21-Topaz II
21-Topaz II
August 8, 2014

I think sheet metal in general is not 100% accurate in terms of mass.The bends have constant wall thickness, for example, instead of being thinned. buit those are somewhat trivial in comparison.

You can create an analysis feature in ahead of your die/punch features (assuming they are at the end of the tree) that captures the part mass and assigns it to a parameter. Creo also can assign mass to a part and use that in assembly level mass properties calculations. There may be a way to use the analysis feature true mass calculation to drive the assigned value.

A bit if work, and sorta clunky, but you may get it to work. I'd agree, the software should handle this better.

    puzzled1-VisitorAuthor
    1-Visitor
    August 9, 2014

    Yes i agree its not 100% accurate but flattening form dimension and mass are major concerns that cad software should add.I mean on sheet you can have no. of punches....you can ignore those parameter for 1-2 but not for 20-30 which makes a vast difference. Now to do same in creo we have to buy another extension. i had been at Solid edge ST7 seminar yesterday where they agreed to the fact that flattening the form will add into sheetmetal dimension as customer required and yes its inbuilt functionality.

    TomD.inPDX17-Peridot
    17-Peridot
    August 9, 2014

    You could take the mass data from the flat state. The flat pattern feature has the option to flatten all forms. Actually, this would make for a nice improvement where one could switch the mass properties (volume) to read the volume at the flat pattern feature (since this is -always- at the end of the tree) if it exists. A simple smtl config.pro option would manage this. Or provide a separate mass property entry for the flat pattern state in the software. This one should be very easy to implement if anyone can decide on the best way to handle it.

    if you can, vote here: Calculate sheetmetal mass properties in the flat pattern state

    rohit_rajan15-Moonstone
    15-Moonstone
    August 11, 2014

    "flatten quilt" option might help you to get the flat blank size..taking into account the punch also.

    puzzled1-VisitorAuthor
    1-Visitor
    August 11, 2014

    flatten quilt in sheet metal? Couldnt locate the command!!

    rohit_rajan15-Moonstone
    15-Moonstone
    August 11, 2014

    you have to copy the surface that you want flatten and then take copied surface into part modelling to use the fallten quilt option

    pharris1-Visitor
    1-Visitor
    August 14, 2014

    I'm not interested in sheet metal work. Your question "Is it a bug?" wasted my time. Please include some specific information in your title.

    TomD.inPDX17-Peridot
    17-Peridot
    August 14, 2014

    How many post did you read before you realized it wasn't interesting to you?

    dschenken2-Explorer
    2-Explorer
    August 14, 2014

    It's his first post. Maybe he signed up just to make it. Possibly thought it was about insects and arachnids.

    puzzled1-VisitorAuthor
    1-Visitor
    August 19, 2014

    @David I am so sorry it wasnt for you ...that was for philip Harris...i clicked on wrong reply.. again sorry

    is it a bug?

    TomD.inPDX17-Peridot
    17-Peridot
    August 19, 2014

    Jehan.... have you found a solution among the replies that has helped with your query?

    puzzled1-VisitorAuthor
    1-Visitor
    August 19, 2014

    I have been out for a week...festival time so ..and came back yesterday night...i gave a try to what Rohit said...and asked one of my colleague to compare the same result with a software called logo press(add in to check flatten form and other things too) i will come up with few other comparison and let you know how much error it causes with other components...as flatten quilt doesn;t take into account this y-k factor and also thinning or stretching.i ll also look into other solution u gave too!!its morning and going to office

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