... of sheet metal, such as automobile body parts, two parts may be used, one, called the punch, ... expands the closed end of tube through the use of two types of bulging dies. Similar to the way a chefs ... part that has been formed would be the positive end(+) of a AA battery. Cold forming (cold heading ... process soft webs, such as paper and cardboard. Two rules are used, cutting and creasing rules. This ...