Compound And Progressive Dies

Compound dies combine two or more operations at one station as illustrated

, strip stock is fed to the die, two holes are punched , and the piece is blanked on each stroke of the ram. when the operations are not similar, as in the case of a blanking and forming operation, dies of this type are frequently know as combination dies.

A progressive die set performs two or more operations simultaneously but at different stations. A punch-and-die set of this type is shown in Fig.17-2. As the strip enters the die, the small square hole is punched. The stock is then advanced to the next station, where it is positioned by the pilot as the blanking punch descends to complete the part.

This general type of design is simpler than the compound dies, because the respective operations are not crowded together. Regardless of the number of operations to be performed, the finished part is not separated from the strip until the last operation.

In the perforation of metal one or two rows of punches are employed. The metal sheet is moved incrementally through the press each time the punches are withdrawn. The punched holes may be almost any shape. All nonbrittle metals can be perforated.

Misalignment of punch and die causes excessive pressures, shearing or chipping of

die edges, or actual breaking of the tools, Such action may occur through shifting even though the setup is originally correct. To prevent these occurrences, proper alignment is ensured by guide rods at two or four corners of the die that fit into holes in the punch holders, These dies are known as pillar dies. This arrangement of having the punch and die held in proper alignment facilitates the setting up of the tools. A similar arrangement, Known as a subpress die and accasionally used on small work, employs a punch and die mounted in a small frame so that accurate alignment is always maintained. pressure is applied by a plunger tat extends out of the top of the assembly.

by: pmolds

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