how does progressive stamping work

Step 1: Material Preparation & Loading

A metal coil/strip is loaded onto the decoiler. The strip is straightened and fed into the progressive die via the feeder system.

The strip is positioned so that each feed cycle moves it to the next station in the die sequence.

Step 2: Sequential Processing at Each Station

The metal strip moves through 3–20+ stations (depending on part complexity), with each station performing a unique operation. A typical sequence for a small electrical terminal might include:

Station 1: Piercing – Punches holes, slots, or notches into the strip (e.g., mounting holes for the final part).

Station 2: Blanking (Partial) – Cuts a portion of the part's outline, leaving the part attached to the strip (called a carrier) for continued feeding.

Station 3: Bending – Forms bends or curves in the metal (e.g., shaping the terminal's pins).

Station 4: Coining/Embossing – Creates shallow indentations or raised details for structural or functional purposes.

Station 5: Final Forming/Threading – Completes the part's final shape (e.g., crimping, folding).

Station 6: Cut-Off (Final Blanking) – Severs the fully formed part from the carrier strip, releasing the finished part.

Step 3: Continuous Feeding & Cycling

After each press stroke (where the punch descends, performs the operation, and ascends), the feeder system advances the strip by exactly the pitch length. This cycle repeats continuously-fast, automatic, and uninterrupted-until the coil is exhausted or production stops.

Step 4: Part Collection & Finishing

•Finished parts fall into a collection bin, conveyor, or tray for sorting.

•Any remaining carrier strip (scrap) is wound into a scrap reel for disposal or recycling.

•Post-processing (e.g., deburring, plating, heat treatment) may be added to meet quality requirements.

Critical Factors for Success

•Die Design Precision: The die must be engineered to align perfectly with the metal strip, with tight tolerances (often ±0.01mm) to avoid misalignment or part damage.

•Feed Accuracy: The feeder must advance the strip consistently-even minor misalignment can cause defective parts (e.g., misaligned holes, bent features).

•Material Compatibility: The metal strip must match the die and press capacity (e.g., soft metals like aluminum require lower tonnage than high-carbon steel).

•Press Tonnage: The press must provide enough force to perform all operations across the stations (calculated based on metal thickness, material hardness, and operation type).

•Lubrication: Proper lubrication of the die and strip reduces friction, prevents metal galling, and extends die life.