assisted engineering design of a die set for the stamping of the fender panel commercially available computer based programs such as those identified above are used to then design a female die surface and a male punch surface and a binder ring shape suitable for controlling the stamping of the selected sheet metal material data concerning the thickness of the sheet metal its physical properties and its deformation forming characteristics are used in the computer program in the design of the die set some panel shapes may require more than one stamping operation and thus more than one set of stamping dies to make the part the die components of a set are then made by known practices and as soon as they have been finish machined or otherwise shaped to the specification of the math based program the components are ready for try out with an actual blank of the specified sheet metal material fig1 illustrates in exploded view the arrangement of the movable female forming die surface 110 sometimes called the upper die surface in this specification a sheet metal blank 112 binder ring 114 and a stationary male punch surface 116 the full die members are not shown to simplify the illustration the female die member is secured in the upper platen of.