Hi Tenson
You could have a go @ spinning them you would need a to have a lathe big enough to take the pipe in the chuck, preferably gripped in soft jaws with a mandrel down the pipe, pipe would need annealing first. possibly a polished former/ template so they all come out the same. have a look on youtube for metal forming in the lathe. the special machines are pretty heavy duty but copper is soft when annealed.
Regards
Mike