Manufacturing Process
Progressive Die Stamping
级进模冲压
High-volume stamping where coil stock passes through multiple stations in one die set to complete a part progressively.
Process Steps
- Coil feeding
- Piercing and forming per station
- Final blanking
- Part ejected
What is a progressive die?
Direct answer: a progressive die performs a sequence of operations as the strip advances one pitch at a time. Station one pierces, station two forms, station three draws, station four taps, the last station parts the finished component — all in one tool, one press, one pass of the coil.
Nothing is handled between operations, which is why the process holds its position tolerances and why the piece price falls as volume rises.
How the strip works
- Pilot holes are pierced first. Every later station locates from them, so accumulated feed error is removed at each stroke.
- Cutting stations pierce the features and trim the outline in stages.
- Forming stations bend, coin or draw — often in several steps so the material is not asked to do too much at once.
- Secondary stations add in-die tapping, countersinking, marking or a sensor check.
- Parting separates the finished component, and the skeleton goes out as scrap.
When a progressive die pays
| Annual volume | Tooling that usually wins |
|---|---|
| Under about 10,000 pcs | Single-station or compound die — lower tooling cost matters more than the piece price |
| 10,000 – 50,000 pcs | Either. It depends on how many operations the part needs and how tight the tolerances are |
| Above about 50,000 pcs | Progressive (or transfer) die — the higher tooling cost amortises quickly into a much lower piece price |
Between roughly 20,000 and 50,000 pieces the decision usually comes down to the part: a component that needs piercing, forming and tapping in one strip benefits far more from a progressive die than a simple flat washer does.
What can be combined in one strip
- Piercing, trimming and parting
- Bending, coining and forming
- Deep drawing in several stations, including an inter-stage anneal where the material demands it
- In-die tapping units and countersinking
- In-die sensing to detect a misfeed or a mis-hit
Where the cost actually sits
Tooling is the visible cost and the strip layout is the hidden one. How the parts nest in the coil decides how much material becomes part and how much becomes scrap, and on a drawn or formed part the material is usually the largest single element of the piece price. A layout that saves 5 % of strip utilisation is worth more over a production life than a cheaper die.
Frequently asked
What is progressive die stamping?
Stamping with a multi-station die in which the strip advances one pitch per stroke and each station performs one operation, so a finished part comes off the end of the tool with no manual handling.
How do I know whether my part should be progressive?
Start with annual volume: below about 10,000 pieces a single-station tool is usually cheaper overall; above about 50,000 a progressive die almost always wins. In between it depends on the number of operations and the tolerances. A tooling review answers it for the specific part.
Progressive die or transfer die?
A progressive die keeps the part attached to a strip that is fed through the tool. A transfer die separates the part and moves it between stations with a transfer mechanism, which suits larger parts that would need an unwieldy strip.
What happens if the strip misfeeds?
In-die sensing is the standard answer: a mis-hit detection pin or an optical sensor stops the press before it can damage the tool or run a batch of scrap. Without it, a misfeed usually means a repair and a lost shift.
Related: progressive die stamping capability · precision stamping · blanking · in-house tooling · deep drawing