K-factor on a cone press

3D Design Volume Model
1

Hello everyone,

I'm looking for an explanation more than a resolution.

I have just realized that there is an importance in the choice of the edge when creating a sheet metal piece from an incomplete cone; indeed, depending on whether we choose the edge inside or outside, the K factor is reversed.

This is not the case for a cylindrical part.

Have fun creating a sheet metal piece with my example by changing the edge and you will surely understand better.

Can someone explain to me why.

Thank you in advance.

 

Sat

 

 


dev_cone.sldprt
2

probably because your development is superior when looking for the outer edge

via the deformation of the sheet metal and its stretching

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3 Likes
3

@gt22 I don't think so because the values are really reversed.

 

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dev_cone.jpg
1 Like
4

I wasn't talking about the opposite values (that in my opinion is like a wolf)

but of the K-factor

which it from internal or external references

it is obvious that the losses at the bend (factor K) are not the same

That's what I wanted to say

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1 Like
5

Hello

I just did some tests and checked your settings. With the factor of 1 (=1x thickness) it will take the opposite side for the dev. So if you select the int edge, your dev will be taller and the ext edge, the dev will be smaller. To have the neutral fiber you have to put a K factor of 0.5 ( = 1/2 ep). Put 0.5 and your developed will be identical whatever the selected edge....

5 Likes
6

See this tutorial

sheet metal tools

https://www.youtube.com/watch?v=ghalOYesjlU

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