If you are trying to put a flange/flare on a hole in a panel like shown below you need a die that will form the shape you want. You cut/punch a hole and then using a press with the die to form the flange/flared hole.
This is a die made years ago that will make the flared shape with a radius lead in.
Most of the dies you see for sale today don't have a radius lead in they have a beveled lead in.
You could also make a hammer form to make the shape especially on the larger holes.