Sheet metal cone

bryan_lagrange

We make our cones on a press brake with triangular bends.

Here is the work around I did to achieve a sheet metal cone in Onshape with a flat pattern.

To make it smoother just add more sides to the polygon sketches.

https://cad.onshape.com/documents/b61553ca7c0d34c686ac170f/w/29eed6f7cd27da738910e958/e/30bef0d598165d2813c5e1f0

Would like to see how other Onshape sheet metal users achieve this shape.

barry_chisholm

Bryan, just trying to work out how you out the split in the loft surface.  Bit of a newbie to this so any help would be appreciated.  

bryan_lagrange

This is how I did it:

I first offset a plan to establish the height of the cone. I then made a multi sided polygon (60 sided) on each plane. Each polygon had a different diameter. On one of the segments of the polygon I put about a .010in split down the middle. Make sure you split the same segment on each polygon for the loft to generate correctly. I lofted the 2 polygons to create the cone shape. After creating the loft surface I then used the sheet metal command to convert the loft to sheet metal solid. It will create a part for each polygon segment. Use the add bend command to add bends where each segment connect. 

Hope this helps

aaron_harris672

https://forum.onshape.com/discussion/comment/62398#Comment_62398

Hi @bryan_lagrange i cant get the sheet metal conversion to work. I have shared my link below. I must be missing somthing. Can you help?

https://cad.onshape.com/documents/90338996902a1d9d9b801055/w/b28b6faab27ccd64322223d4/e/db6cc37221e43c2063457b82?renderMode=0&uiState=676b20b1851ca92bd38441ad

bryan_lagrange

@aaron_harris672 It looks like you have some twisting going on in the loft which would cause compound curves. Current sheet metal functions do not like this. I updated the sketches and used the thicken command in sheet metal to have your loft flatten in sheet metal. Here is the link. Hope this helps.

https://cad.onshape.com/documents/2f24160b17fd32e9491671e4/w/fea14f476f7c22e446cb55b1/e/247159b2e7c66a593fd55ab9

Henk_de_B

If you want a smooth flattened part you can model it as a surface and thicken the flattened surface later. The new surface flatten feature can flatten almost anything. From circle to rectangle, containing a fillet with torsion distortions, no problem, I think this new feature is even better than in Solidworks. The only drawback is that after exporting to a parasolid file, the bendlines of the flat surface have disapeared.