Made a press die for the making the hat stiffeners and then made the hat stiffeners. No spring back angle was needed in die, probably because it was made in a press and was supported and pressed from all sides.. Part came out with proper angles and dimensions.
Press die with completed hat stiffeners
Die in place and slightly off alignment holes to show profile
Side view of press die with completed sample hat stiffener on top to show profile of completed part.
