Stamping Die Tryout and First-Article Inspection
A practical checklist for checking the die, measuring stamped parts and confirming the press-feed line before production release.
A stamping die tryout checks how the tool performs in an identified press and material setup. First-article inspection checks whether the resulting parts meet the specified requirements. Together, they connect tooling adjustments to measurable resultsโbut a good sample alone does not establish that the line is ready for routine production.
Die tryout, first-article inspection and run-off: different questions
Die tryout
Question: does the tool produce the intended progression and part geometry in this setup?
Review forming and cutting results, strip movement, part release and issues that require tooling or process correction.
First-article inspection
Question: do the identified samples meet the specified product requirements?
Connect drawing characteristics, material requirements and actual measurements in a traceable first article inspection report.
Production run-off
Question: does the agreed production arrangement meet the acceptance plan?
Evaluate repeated part results, feeding, scrap discharge and interruptions under the specified operating conditions.
Agree on these terms with the customer. A toolroom trial, a die buyoff and a receiving-plant production approval may have different deliverables. For example, AutoDie describes die tryout and validation as work involving the tooling, press conditions and part evaluation. The acceptance agreement should state which conditions your project must demonstrate.
A first-piece check at a routine setup is also not automatically the same as a formal first-article inspection (FAI). If a contract invokes a particular reporting standard, use that requirement. IAQG 9102 addresses aerospace FAI; it should not be presented as a universal requirement for every stamped component.
Stamping die tryout checklist: prepare before the trial
Set the acceptance criteria before making samples. The tooling, production and quality teams need one controlled record of the intended setup, the characteristics to inspect and who can approve a change.
- Drawings and revisions
- Identify the part, die and strip-layout revisions. Include specified tolerances, drawing notes, special characteristics, inspection stage and any approved deviations.
- Material and lubricant
- Record grade, thickness, width, condition or coating, material lot and lubricant. Identify differences between trial stock and the intended production stock.
- Press and mounting
- Confirm the target press, working-point capacity, energy, installed die-height stack, support, clamping and opening clearances against the approved setup.
- Feeding and protection
- Identify feed pitch, material pass line, stock support, pilot-release requirements, interface signals, die protection and the finished-part and scrap routes.
- Measurement plan
- Assign a suitable measurement method to each required characteristic. Specify datums, fixtures, sample identification and calibrated or verified measuring equipment.
- Trial and release plan
- Agree on operating conditions, sample quantity, sampling points, interruption records, acceptance limits, approval responsibilities and any customer witness requirements.
Resolve compatibility questions before the trial. Use the die setup and transfer checklist for the complete installation, and the bolster, subplate and adapter-plate guide when the mounting stack has changed.
Check the strip progression and press-feed sequence
In progressive die stamping, a finished-part defect may begin several stations upstream. Retain an identified strip sample when it helps connect the symptom to a station. Note where the first incomplete cut, distorted carrier, displaced feature or surface mark appears.
Under the approved safeguarded setup procedure, the responsible personnel should verify delivered feed, pilot correction, stock guidance, lubrication, protection signals and discharge as a coordinated sequence. The inspection record should distinguish the commanded feed length from the measured strip advance and the final die-located feature position.
Check that the strip path matches the die entry. An unsupported span, vertical mismatch or lateral pull is a setup question to investigate, not a reason to immediately change the tool geometry. Keep the accepted feeder settings and any corrections with the trial record. The separate feed-pitch accuracy guide and pilot-release timing guide explain those interfaces in more detail.
First-article inspection checklist for stamped parts
Use the current drawing and inspection plan to determine the required coverage. Critical dimensions deserve particular attention, but they do not replace the other characteristics required by the customer. Record numerical results where a variable measurement is required; use pass/fail only where the approved method calls for an attribute check.
Material and sample identity
Link each sample to the material lot, part revision, die, press and trial condition. Check the specified material documentation and stock dimensions. Identify the relevant lane, cavity or output position where the tool produces more than one part per stroke.
Cut and pierced features
Measure the required outline, holes, slots, notches and feature positions. Use the drawingโs datums and geometric tolerances rather than assuming an edge-to-edge measurement establishes positional conformity.
Formed geometry
Check bend angles, flange heights, formed profiles, flatness or twist where specified. State whether the measurement is made in the free state or in an approved fixture, and identify the process stage at which it applies.
Edges and surface condition
Evaluate burrs, sharp edges, cracks, wrinkles, pickup, scoring, dents and coating damage against the agreed requirements. There is no universal acceptable burr height or cosmetic limit for all stamped parts.
Functional and downstream requirements
Include specified fit checks, gauges, assembly interfaces and other tests. Distinguish the as-stamped condition from the final condition after operations such as deburring, heat treatment or plating.
If a measurement fails, record the actual result and the affected sample. Preserve useful evidence before changing the die or setup. A correction should have a recorded reason, an authorized scope and a defined reinspection requirementโnot an undocumented adjustment followed by a different sample.
What belongs in a first article inspection report?
A useful first article inspection report, often called a FAIR, lets another person trace a requirement to a sample, a result and a decision. 1factoryโs FAI guide explains the relationship between drawing characteristics and inspection records. Use the customerโs required format where one is specified.
Do not mix results from different setup revisions without identifying them. If the feed setting, tooling component or material changes during tryout, record which samples were produced before and after the change. Mark a characteristic that cannot yet be verified as outstanding rather than treating the blank field as acceptance.
How many parts should be inspected? There is no single sample count for every stamping FAI. Agree on the number and selection method through the drawing, customer requirements and inspection plan. Multiple lanes, material variation, a capability study or a formal approval program may require different evidence. โFirst articleโ does not mean that one selected good part is always sufficient.
Confirm the intended production condition before release
A controlled tryout can establish basic sequence and geometry without proving sustained operation. For a production run-off, define the required material, press, feeder, lubricant, tooling revision, target operating rate and acceptance criteria. Record any mismatch between the supplierโs tryout arrangement and the receiving plantโs production line.
The agreed trial should evaluate part results across its sampling points and document feed interruptions, alarms, scrap accumulation, part-discharge problems and adjustments. If a correction changes the accepted setup, determine which portion of the trial and inspection must be repeated. The trial duration and allowable interruptions belong in the acceptance agreement; they should not be invented from a generic checklist.
Where process capability evidence is required, use the specified measurement-system and statistical plan. Passing dimensional samples does not, by itself, establish a capability index or demonstrate that the process is statistically stable.
FAI also does not automatically complete automotive PPAP. AIAG describes Production Part Approval Process in terms of meeting design and specification requirements during an actual production run at production rates. Follow the customerโs applicable submission and approval requirements in addition to the trial and inspection records.
Close the issues, then preserve the accepted setup
Keep the die or affected product on hold when required measurements remain incomplete, a nonconformity lacks an approved disposition, protection behavior is unresolved, or the agreed production-condition trial has not been completed. A customer concession, where permitted, must identify its scope and restrictions; it is not an informal substitute for meeting the drawing.
At release, retain the accepted setup revision, inspection results, sample identification, material information, trial conditions and approvals together. Carry forward the agreed in-process inspection and reaction plan so production knows what to check and what action to take if the condition changes.
New tooling, a design change, significant repair, a press transfer or a changed manufacturing route can prompt a review of the validation and inspection scope. Whether a full or partial FAI is required depends on the applicable customer and quality-system requirements. For reconditioned tools, connect the release record to the die maintenance and repair history.
Frequently asked questions
What is a stamping die tryout?
It is a controlled evaluation of a die in an identified press, material and process setup. The trial connects tool function and part results to the corrections and acceptance work needed before release.
Is first-article inspection the same as checking the first part?
Not necessarily. A routine first-piece check follows the setup inspection plan. A formal FAI has the scope, documentation and sample requirements defined by the contract or applicable quality system.
Can a successful die tryout approve mass production?
Only if it also satisfies the agreed production-release requirements. A trial that proves a sequence or a few dimensions may still leave production-rate performance, complete inspection or customer approval outstanding.
Does every stamping project require AS9102 or PPAP?
No. These requirements depend on the sector, contract and customer. Confirm the applicable approval method rather than labeling a general stamping inspection report as AS9102- or PPAP-compliant.
What should be sent when a feed problem appears during tryout?
Send the press and feeder models, material data, feed pitch, operating rate, setup references, alarm history and identified strip or part measurements. Include clear photos of the material path and the affected feature.
Need to match the feed line to your die trial?
Share your strip layout, material range, press and feeder models, feed pitch, target rate and the problem you need to resolve. HENLI can review the coil-feeding requirements and discuss equipment or retrofit options for the project.
