Skip to main content
J
joe_c14-Alexandrite
14-Alexandrite
July 24, 2024
Question

Sheetmetal flange and boundary blend

  • July 24, 2024
  • 2 replies
  • 2140 views

Hello gurus

 

I am trying to create a Cap in sheetmetal because the process resembles the making of a milk carton.

We start with a flat paper cloth, fold in half, bend the ends together into Seam SSn-1 and stich it, the upper end (see closed fold image) is stitched and the upper section is folded into a triangle frame shape.  

I am stuck creating the triangle frame using boundary blend and cant match the geometry inside the cap,    Makes me wonder if I there is a better way to model it in sheetmetal.  At the end, i would flatten but not all features flatten either.

If anyone has modeled a milk carton or similar, it would certainly help

 

thanks 

 

joe_c_0-1721853111519.png

joe_c_0-1721853970861.png

 

 

2 replies

tbraxton
22-Sapphire II
tbraxton22-Sapphire II
22-Sapphire II
July 24, 2024

They key here is that only surfaces that can be developed will flatten in sheet metal. You can check your surfaces in Creo by analysis of the Gaussian curvature.

 

In mathematics, a developable surface is a smooth surface with zero Gaussian curvature. It is a surface that can be flattened onto a plane without distortion (i.e. it can be bent without stretching or compression). Your boundary blend is almost certainly not developable, check the Gaussian curvature to confirm.

 

The flat pattern for a milk carton will be similar to this:

tbraxton_0-1721854090607.png

 

    A
    anursinghCommunity Manager
    Community Moderator
    August 7, 2024

    Hi @joe_c,

     

    I wanted to follow up with you on your post to see if your question has been answered. 
    If so, please mark the appropriate reply as the Accepted Solution. 
    Of course, if you have more to share on your issue, please let the Community know so that we can continue to help you. 

     

    Thanks,
    Anurag
     

    Terms & ConditionsCookie settingsAccessibility statement