We manufacture rigid boxes. Most material we use are .098" chip board with "V" groove so that when folded to 90 degrees, the outside edge becomes sharp 90 degrees not like sheet metal round radius. Any suggestions? Thank you.
See if @Imics video gives you a possible insight into a workable solution.
Sean CresswellDesign Manager Streetscape LtdSolid Edge ST10 [MP6] Classic [x2 seats]Windows 10 - Quadro P2000
I hope, this video will be helpful for you:
Sorry, dims are in mm not inch, but you can reproduce the steps.