I have Googled extensively and have not found any references to any drawing symbols for use in specifying sheet metal operations. Creo has the symbols for indicating bend direction and angle, but things like bend relief, forms, puches or dies can only be defined by detailing.
Does anyone know if their are standard or even examples of symbols used to indicate things like Relief types (Obround tangent, Square w/ depth, etc)? What about anything other than a note when a stamping operation uses a known form for something like a louver? (I would expect to have to put the part number of the form/die/punch into the symbol)?