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unbending a cone


New member

i ve to design and to undend a cone.

i ve made different test for modeling, each method i ve used don t allow me to unbend it

does anyone has faced this?


New member
Is the cone solid all the way around? There needs to be a rip (split) along the cone somewhere or there is no way to unravel it. Use the rip command to create a rip along edge. I have done it along the curve that is on the intersction of a dtaum plane and the surface of the cone. The cone cannot go all the way to the top. This is not theoretically possible for a sheetmetal part.

View attachment 693

View attachment 694


actually i am having trouble with the edge rip.

i can get the curve with the intersection to the cone, but i can not get the edge rip part working.

i think if i cut it in part mode and then bring it back to
sheetmetal it woudl work, but would be good to learn how to use that
rip feature i guess :)

rip->edge rip-> then i dont have a edge to select.


New member
the part shown in the image is not a pure bending component. hence you are not able to unbend or flatten the component

if you look carefully, the line of bend is not a straight line. its a hyperbolic curve (correct me if i am wrong, but definitely not a straight line). so any bend made on line other than a straight line would not be a pure bending operation. it would be forming/flanging operation and hence Proe will not help you unbend it.

take any plane passing through the axis of the cone and intersect it with the surface of the cone to create a curve. this would be a straight line. any plane other than that would result in a some sort of a spline.


New member
I used a simple unbend. I used the edge of the rip in the cone as my fixed edge. I used a regular rip, for my sketching plane I created a datum that was normal to the cone, through the curve, and I think perpendicular to a plane. I skecthed a straight line (use edge, pick the curve) as my rip. I could re-create the parts and send you them, but I don't know where you are.


Hey i got it :) thanks ur previous post was perfect :)

ur a legend thanks. i needed to do that some 2 weeks back and i just gave up. Now i am the master of that cone !

thanks again