What Progressive Die means
A progressive die spreads a part’s stamping operations across a series of stations built into a single tool. The coil is fed one pitch at a time; at each stroke every station performs its own operation simultaneously — pierce, notch, form, draw, trim, and finally cut the part free. A finished part comes off with every stroke, which is what makes progressive tooling the economical route once annual volumes are high enough to amortise the die.
Why it matters on the shop floor
The engineering effort sits in the strip layout. Station sequence, the bridges that hold the part in the strip until the last operation, the scrap web, the pilot holes that locate the strip and the progression pitch all have to be settled before the die is cut. A strip that is 5 mm too wide wastes material on every one of a million strokes; a pilot hole in the wrong place means the die is rebuilt.
In practice
Progressive tooling only pays off at volume. Below the break-even, laser cutting or a simpler compound die produces cheaper parts, because the tooling cost is spread over fewer pieces. The honest answer to "should this be progressive?" is a calculation, not a preference.
What to remember
- One finished part per stroke — cycle time is set by press speed, not by operator pace.
- Strip layout is fixed once the die is built, so material utilisation and part orientation are locked in at design stage.
- Tight tolerances and secondary features (taps, inserts, countersinks) can be built into later stations.
- Break-even volume versus laser cutting is a standard DFM calculation — ask for it before committing to tooling.