Sheet Metal Fabrication Techniques 8

[Dinga17]

Hi all,

I am attempting to make a non-truncated cone with a very shallow taper/slant angle. My knowledge of fabrication methods and processes is not up to par and, thus, I am curious about how this cone as shown in my attached pictures would be fabricated.

Firstly, is it possible to fabricate this without the need for welding? ie. It wont need to have a flat pattern then bent into shape then welded along a seam. Can it be fabricated by some sort of punch or roll process to get the slant without the need for a seam or welding? It is quite a large cone ie. 2.34 m diamater. Is it possible for smaller diameters?

Secondly, in general what are some of the typical fabrication methods that could be utilised for a job like this? If you have any good links or discussions of processes etc I would love to have a look

Lastly, if I wanted to have a flange on the outer edge of the cone, is it possible to do this after the cone shape is formed? If so, what process would it be completed by?

Apologies for my lack of fabrication terminology, I am new to this

Thanks.

 

[Tmoose]

Nothing to it.

https://www.youtube.com/watch?v=F2rxNwYcsN8

 

[berkshire]

Tmoose,
You will note in my first reply , I mentioned all of the methods used in the cymbal production except the casting. You also have to bear in mind the OP wants to make this thing 1.65m ( About 42" plus or minus.), so finding a shop that can handle this, if he wants it pressed or spun will be a problem. At the same time the OP can make the 1.65M cone out of an 8'x4'X 1/16" ( 3.78m X 1.89m x 1.56mm ) sheet of stainless steel.
By cutting and welding or spot welding.
B.E.

You are judged not by what you know, but by what you can do.

 

[edmeister]

Anybody consider explosive forming??
Note that the diameter of the item is the limiting factor for other methods. with explosive forming, a container has to be fabricated from thick steel construction where the upper surface is the 'mold shape' of the item; and the lower surface flat (with orifice for inlet of high pressure air or explosive discharge. The raw material is bolted between the 2 surfaces. The explosive discharge will distort the material upwards into the shape of the upper form. The large diameter & shallow shape are positive factors for this methodology. see

https://www.youtube.com/watch?v=i5OgIcR0DXc

& various other submissions.

 

[SnTMan]

Depending on the thickness of the material, do dome research on explosion forming.

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[rb1957]

could you form it using weight (sand?) and heat and time ? How perfect a cone (like, how pointy is the peak) ??

another day in paradise, or is paradise one day closer ?

 

[edmeister]

nope .. deformation rate is a significant factor. thus the word 'explosive'.

 

[SnTMan]

Letting it go...

The problem with sloppy work is that the supply FAR EXCEEDS the demand