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Aluminium Extrusion - Tapered Section

Aluminium Extrusion - Tapered Section

Aluminium Extrusion - Tapered Section

(OP)
Tried searching google but struggled to find any information.

I am familiar with the standard aluminium extrusion process for constant section. I am wondering if there is a possibility to extrude a section lets say circular starting at 100mm diameter reducing to 75mm over an 8m length, maintaining a 5mm wall thickness.

I would be interested to know if this is possible and any references to the die design to achieve this.

RE: Aluminium Extrusion - Tapered Section

with sailboat masts they do but I don't know the tolerances

RE: Aluminium Extrusion - Tapered Section

Tapered aluminum tube is a thing.

It may begin as straight extruded tube.

Then tapered by other processes.

Constant wall thickness is probably hard.

RE: Aluminium Extrusion - Tapered Section

(OP)
I have seen progressive forming of masts then welded, but never seen a tapered extrusion.

I have noticed reference to variable geometry dies so was curious if this is actually possible.

RE: Aluminium Extrusion - Tapered Section

engineeringspread,

A tapered tube sounds like a good application for welded sheet metal. The 5086 grade is fairly strong in the as-welded condition.

--
JHG

RE: Aluminium Extrusion - Tapered Section

Hello,

I've seen impact extrusion used to make aluminum baseball bats but in this case the length is less than 1m vs the 8m length you're looking for.

Here's a video of the process:

https://www.youtube.com/watch?v=Aig6-q32Saw

Kyle

RE: Aluminium Extrusion - Tapered Section

(OP)

I called a leading UK extruder and was informed this process is not one they are aware of, so my guess is this isn't possible.

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