When deciding whether to use a multi-station progressive die for a stamped part, the following aspects should be considered:
Design, fabrication, and maintenance of progressive dies
Multi-station progressive dies feature complex structures and require much higher manufacturing precision than standard dies. After each production run, they must undergo inspection and sharpening, and pass a trial run before being returned to storage. Small punches and inserts must be replaced promptly if worn or damaged. For dies involving bending, deep drawing, or forming, sharpening the cutting edges of punches and dies requires simultaneous adjustment of the relative heights of other components. Since the heights of punches and dies in these types of progressive dies often vary, the relative height differentials specified in the original design must be maintained after sharpening. Skilled maintenance personnel and precise, specialized equipment are essential.
Suitable presses
The press used for a progressive die must possess sufficient strength, rigidity, power, and precision, as well as a large bolster area and a reliable braking system. The press stroke should not be excessive; this ensures the die set's guide system does not disengage during operation. Generally, the press should operate at no more than 80% of its nominal tonnage. The die setup must include a detection mechanism for strip feeding malfunctions; upon receiving a signal from this mechanism, the braking system must be capable of stopping the press immediately to prevent damage to the die or the machine.
High-quality workpiece materials
Progressive die stamping does not allow for intermediate annealing or easy application of additional lubricant during processing; therefore, the material's mechanical properties must be relatively stable. Every incoming batch of material must undergo required testing and inspection. Progressive die stamping imposes strict requirements on strip width, thickness tolerances, and edge straightness, as these factors directly affect stamping quality and strip feeding.
Suitability of the stamped part for multi-station progressive die stamping
Production volume and batch sizes must be sufficiently large.
The process must be compatible with the material property limitations inherent to progressive dies.
Feeding precision and cumulative errors across processing stages must not compromise the dimensional accuracy of the finished part. For parts with complex shapes that are difficult to position after stamping, a multi-station progressive die is the ideal choice.