Case Study: In-House Progressive Die Takes an Automotive Terminal Program to 300 SPM

Case Snapshot

An automotive connector maker had designed a new terminal family for an engine-control connector program and received tooling quotes from three stampers. The quotes ranged widely on die cost, piece price, and lead time, but the deciding factor was different: only one supplier could prove the die would be built, tried out, and qualified in-house before the first sample. That supplier was ISTAMPING, and this is the program that followed: a 24-station progressive die running multi-up on an Aida press at up to 300 SPM, with ±0.005 mm piloted registration and an IATF 16949 quality system behind every lot.

Parameter	Value
Part	Automotive connector terminal, crimp-and-lock design
Material	C2600 brass strip, 0.25 mm, up to 650 mm coil
Die	In-house progressive die, 24 stations, 4-up layout
Press	Aida 25-80T high-speed line, up to 300 SPM
Plating	Selective gold 2-8 µm on the contact zone
Quality	IATF 16949:2016, SPC on critical dimensions, CMM + in-line vision

Why the Customer Came to ISTAMPING

The customer had burned two programs with offshore tooling. In the first, the die arrived late and the builder was not on site when tryout started, so the first sample run took three months of long-distance debugging. In the second, the die ran fine but nobody could document the pilot position or the burr-height control, and the customer's PPAP auditor rejected the submission on missing process evidence. The lesson stuck: for a high-speed terminal program, the die builder and the die user need to be the same organization.

ISTAMPING started as a precision tooling house and still builds its production dies in-house. The tool room runs wire EDM, CNC machining centers, tooling grinders, and precision die benches, and every progressive die is tried out on our own presses before it ships to the production floor. That was the answer the customer needed: one company owning the die, the press, the process data, and the PPAP paperwork.

The DFM Review

The DFM review covered the full terminal print, not just the blank. The critical features were the contact beam spring rate, the crimp barrel geometry, the lock-lance form, and the plating window on the contact zone. The review also mapped the part against the strip width, because the economics of a terminal program are decided by how many cavities fit across the coil. At a 650 mm strip width, the layout took a 4-up arrangement without crowding the stations, which put the piece price into the range the customer needed before a single die station was cut.

Two findings from the review changed the print. First, the lock-lance was re-positioned to form from the scrap web instead of the part body, which removed a stress concentration that would have shortened the die's maintenance interval at high speed. Second, the plating window was pulled back from the crimp barrel so selective gold at 2-8 µm covers only the contact zone, cutting precious-metal cost by a third while the barrel runs bare brass for the crimp joint. Both changes were proposed by the die designer, not the customer, which is the value of a supplier that builds and runs the tool it designs.

The Engineering Approach

The tool room designed a 24-station progressive die with a 4-up layout: piloting in the scrap web, coining on the contact beam to stabilize springback, pre-form and final-form stations for the barrel, and in-die lancing of the lock feature. Piloting holds strip registration to ±0.005 mm, which is what keeps all four cavities identical across a 300 SPM run. The die was built, tried out, and qualified on our own Aida press before the first production lot, with springback compensation tuned on the first tryout run and locked into the tool.

Because the die was built in-house, tryout and correction happened in days, not months. Every correction was documented in the same file that later supported the PPAP submission: the pilot layout, the coining pressures, the form-station dimensions, and the burr-height readings from tryout. When the customer's auditor asked how the die was qualified, the answer came from our own floor: a build record, a tryout record, and a production record that all carry the same tool number.

Process Control in Production

Production runs on the Aida high-speed line with automated in-line vision checking the critical dimensions on every strip, and SPC charts track the contact beam and crimp barrel dimensions through the run. The quality lab verifies the first article on the CMM against the full print, and plating thickness is confirmed by X-ray fluorescence on a per-lot basis, so the plated contact zone is verified by measurement, not by appearance. Every lot ships with the same record structure under IATF 16949:2016, from the strip certificate to the vision data to the XRF report.

The 4-up layout turned the die into a four-lane production line: at moderate press speeds the program still produces millions of terminals per year per shift, and the piloted registration keeps all four cavities within the same tolerance band. The customer's PPAP Level 3 submission was built from data generated on our own press, by our own quality lab, under one quality system. It passed with no open items.

Production Results

Metric	Result
Die	24-station progressive die, 4-up, built and tried out in-house
Press speed	Aida high-speed line at up to 300 SPM
Positioning tolerance	±0.005 mm (piloted die)
Plating	Selective gold 2-8 µm, XRF verified per lot
Quality system	IATF 16949:2016, SPC + CMM + in-line vision
Tooling lead time	First samples delivered weeks after DFM approval

The customer has since placed two follow-on terminal programs on the same tool room, including a tin-plated version of the same family with the plating window moved to the crimp barrel. Each program followed the same path: DFM review, in-house tooling, tryout on our own press, PPAP from production data. The die that started as the deciding factor between three quotes is now the standard way this customer sources its terminals.

Die Maintenance and the Follow-On Programs

A high-speed terminal die is a machine in its own right, and its reliability determines whether the press runs at 300 SPM or at a fraction of it. The maintenance plan for this die was written before production started: a scheduled inspection interval for the pilots and coining stations, a wear-monitoring check on the form stations, and a documented sharpening cycle for the blanking sections, all logged in the same quality system as the parts. The customer sees the maintenance record as part of the lot file, which means the die history and the part history are one record, the way an automotive auditor expects it.

That record is also why the follow-on programs moved quickly. When the customer released a second terminal family, the die designers already had a proven station layout, a proven pilot scheme, and a proven plating-window approach from the first program. The second die took less time to build and qualified on the first tryout run. The third program, a tin-plated variant, reused the same tooling architecture with the plating window relocated to the barrel. Each iteration made the tool room faster because the engineering was not being re-invented, it was being reused.

Why This Case Matters for Your Program

If your terminal or connector program depends on high-speed progressive tooling, the supplier decision is a tooling-ownership decision. Ask what this case teaches: Where is the die built? Who tries it out, and on whose press? Can the supplier produce SPC and CMM data from the same line that runs production? Is the plating in the same chain as the stamping? A die built three time zones away from the press that runs it will cost you months; a die built by the same company that runs it costs you nothing extra and buys you the first sample on time.

Send us the terminal drawing and your annual volume. We will run the same DFM review for your part and give you a tooling price with the piece-cost curve at three volumes, so the decision is visible before you sign.

Related reading: progressive die stamping guide · progressive stamping 101 · connector terminal stamping · lead frame stamping tolerances