Learn autodesk inventor sheet metal tutorial how to create cylinder object by using contour roll command check it out.
How to roll sheet metal into a tube.
Tip add a bead of silicone sealant along the overlapping edge if you require the cone to be water tight.
To develop the blank flat length for a cylinder rolled from sheet or plate is quite simple.
Outside diameter thickness x 3 1416 length of plate required inside diameter thickness x 3.
Essentially you should calculate the centerline arc.
When sheet metal is inserted between two such rolls the urethane wraps the sheet metal tightly against the steel roll.
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This is 2 x 2 with a 25 wall thickness stainless square tube rolled into complete metal tube rings with an inside radius of 6 inches.
Rocdoc 4 331 547 5.
Forming radius bends in sheet steel would normally be done with slip rolls but acceptable work for a lot of jobs can be done using a piece of pipe.
Roll the template into a cone shape overlapping the sheet metal by 1 2 inch then drill a few holes along the seam and seal it closed by placing rivets in the drilled holes.
At jorgenson metal rolling forming located in santa ana california we specialize in tube rolling and pipe rolling.