Making a sheet metal collar onto a tube

ME 2016-04-26

Hi guys and girls,

Sorry if this already been up for discussion but I cannot find it. Feel free to post any link where the question already been up.

I am trying to make a collar follow a pipe. The collar is straight onto to pipe but angled around 45-60 degrees or something.

I saw sometime ago on the internet a post about drawing the profile of collar then using wrap tool to "sweep" it around the path.

But example 2 is nowhere to be found:

Now I tried using sweep but then I dont know how to flatten it.

I attach my part and a picture.

Is there any good add-on that makes sheet metal like this easier?