For the commercial side of the same process - dies built in house, presses from 25 t to 350 t - see progressive stamping dies.
Progressive Die Stamping: How The Tool Actually Works
By Yu Lianbo — Tooling Design Engineer
What is progressive die stamping?
Progressive die stamping forms a part inside the strip: the coil feeds through a series of stations, and each stroke performs one operation - piercing, forming, drawing, tapping, cut-off. The part is only complete when it reaches the last station, so the strip layout and the carrier design decide whether the part can be made at all.
What the tool decides
Strip layout - the sequence of cuts and forms, and how much material the carrier needs to stay stable through every station.
Stations - one operation per stroke. A part with a thread, a drawn pocket and a bend needs more stations, and a longer tool.
Pilots and carriers - what keeps the strip registered to the die. This is where hole-to-form position tolerance comes from.
In-die tapping - threads formed in the press rather than in a secondary operation, which removes a handling step and a re-fixturing error source.
Scrap and material use - a tighter layout lowers material cost per part but needs more engineering and a more precise tool.
When a progressive tool is the right answer
Progressive tooling pays back at volume: the tooling is more expensive than a single-hit die, but the cycle time per part is far lower. Below a certain annual quantity a single-operation die - or a short-run tool - is the cheaper route, and the honest engineering answer is to say so. Balford builds both, in house, so the recommendation is not biased towards the bigger tool.
Question
What changes the answer
Progressive or single-hit?
Annual volume, part size, how many operations the part needs, and how much re-fixturing error the tolerance allows
How many stations?
One per operation, plus pilots, plus any idle station kept for future changes
Can the thread be tapped in die?
Material, thread size, wall thickness and whether the strip can carry the tapping station
What decides flatness?
Carrier design and how the part is released at cut-off
Balford designs and builds both progressive and single-hit tooling in house, on presses from 25 t to 350 t, and has built more than 4,000 single-hit deep drawing dies since 2000 through the predecessor company Ruian Derlin Stampings Factory. Send a drawing or 3D model with the annual volume and the DFM review will say which tool type makes sense at that number.
Threads formed inside the press on a Balford progressive tool - no secondary tapping operation and no re-fixturing.
The video above is our own tool, not stock footage: a thread is formed inside the press while the strip is still carried by the die. That is the practical difference between a progressive tool and a sequence of separate operations - fewer hand-offs, and the position of the thread is set by the die rather than by a fixture.
Progressive, single-hit, transfer or compound?
Progressive
Single-hit
Transfer
Compound
Where the part is formed
In the strip, one station per stroke
One part per stroke, handled between operations
Blank carried between stations by a transfer
Cut and form in the same station
Tooling cost
Highest
Lowest
High
Medium
Cost per part at volume
Lowest
Highest
Low
Low
Best fit
Small to medium parts, high volume
Low volume, prototypes, large parts
Larger parts that the strip cannot carry
Flat parts with one forming step
What decides it
Annual volume, operations, part size
Annual volume and tolerance stack from re-fixturing
Part size and weight
Part geometry
What a progressive tool quotation should show you
Number of stations, and which operation runs in each one.
Strip layout and material utilisation - the coil width and the pitch decide your material cost per part as much as the price of steel does.
Whether the thread, if there is one, is tapped in die or in a second operation.
Tooling ownership, storage and the cost of a future engineering change.
The annual quantity at which a single-hit tool would have been the cheaper route.
Frequently asked questions
Is progressive stamping cheaper than single-hit stamping?
Per part yes, per project no. A progressive tool costs more to build and the strip layout takes more engineering, but the cycle time per part is far lower because every operation runs inside the stroke. Below a certain annual quantity a single-hit or short-run tool is the cheaper route, and Balford builds both in house so the recommendation is not biased towards the bigger tool.
How many stations does a progressive die need?
One station per operation - piercing, forming, drawing, tapping, cut-off - plus pilot and carrier stations. A part with a thread, a drawn pocket and a bend needs more stations than a flat pierced part, and the tool gets longer with every operation.
Can threads be tapped inside a progressive die?
Yes. In-die tapping forms the thread in the press instead of in a second operation, which removes a handling step and the re-fixturing error that comes with it. Balford runs in-die tapping on progressive work; the video above shows a thread formed in the press.
What decides the flatness of a progressive stamped part?
Carrier design and how the part is released at cut-off. If the carrier does not hold the part flat until the last station, the part springs on release and the flatness callout cannot be met by inspection alone.
What material thickness can be run on a progressive tool?
Balford runs progressive tooling across the sheet thicknesses used in our press range of 25 t to 350 t, in stainless steel, aluminium, brass, copper, carbon steel (DC01 / DC04 class) and 65Mn spring steel. The limit is set by the die, the strip width and the press, which is confirmed against the drawing.
How do I decide between progressive, transfer and compound tooling?
By annual volume, part size and how many operations the part needs. Progressive suits small to medium parts at high volume; transfer suits larger parts where the strip cannot carry the part; compound tooling cuts and forms in one station. Send the drawing with the annual quantity and the review will say which one fits.
What documentation comes with a progressive tool?
First article inspection (FAI) against the confirmed drawing, and PPAP-aligned documentation at the level the customer's quality department asks for. Material certificates are kept per heat and IMDS entries are filed on request.
Who owns the tool after it is built?
Tooling ownership and storage are stated in the quotation, and the question is settled before the tool is built rather than after. Ask for it explicitly if your programme requires customer-owned tooling.