PROGRESSIVE die sets commonly are used in stamping. The raw material is coiled on a spool; the process uncoils the material and feeds it into a series of dies that transform the original flat material into a useful component. The idea of using a series of dies to form a part has been around for a long time. The concept of forming a tube by using a set of progressive dies may be more common than you think. Tube mills use a progressive process for forming tube from a strip of material (see Figure 1). In this case, the flat strip is transported through a series of dies, which change the shape from flat to round, square, rectangular, oval, or some other shape.
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