A correct lamination handover links the physical source, part identifier and active receiving sequence. Validate all three at adjacent core stations to keep similar-looking parts in their intended jobs.
Bind the transfer to the receiving task
At the transfer boundary, compare the part identity with the station, job revision and expected sequence position. Include material identity where externally similar parts can use different grades or treatment states. The source rack location should identify the physical material being picked, not merely a nominal inventory entry.
Keep reservations distinct from completed transfers. A station may reserve a part, then stop before picking it. Another job or operator movement can change the rack while the old reservation remains. The next transfer must resolve that changed physical state rather than trusting the stale reservation.
| Boundary record | Binding to verify | Swap challenge |
|---|---|---|
| Source rack | Physical location and current material identity | Valid label moved to an adjacent location |
| Receiving station | Active job revision and expected part | Valid part from the other station’s job |
| Transfer event | Reservation, pick and receipt linked | Interrupted transfer with stale reservation |
| Return or replacement | Actual destination and new sequence requirement | Returned part mistaken for a fresh allocation |
Test identities that are plausible
An unreadable identifier is usually an obvious exception. A more revealing test supplies a correctly formatted, readable identifier belonging to the wrong job, grade or sequence position. Include two parts with the same outline but different permitted destinations.
Run those challenges in a controlled validation environment with test material physically segregated from production stock. Record where the mismatch is detected and whether the physical part remains at a known location. A software rejection after an unidentified sheet has already entered the stack is a different outcome from a pre-transfer rejection. [1]
Resolve the physical disposition
When a mismatch is found, preserve the observed identity, source and receiving task before relabelling or relocating anything. Determine whether the part was merely offered, held by the tool, deposited or buried by later layers. Each state changes the recovery work required.
Validate the actual identity protocol against the cell’s rack moves, simultaneous jobs and interruptions. The presence of multiple cutting/stacking stations does not establish that identifiers remain bound to physical parts.
Use the catalogue density 7,650 kg/m³ and thickness 0.23 mm to define a secondary identity check. [2] Assume variants A and B are each 1.0 m long but 0.20 and 0.22 m wide. Nominal masses are 0.3519 and 0.38709 kg, differing by 35.19 g. If an assumed weighing system’s expanded uncertainty is 5 g, mass can discriminate this pair under controlled oil-film conditions. It cannot discriminate equal-mass parts with different lap tips. Bind the physical identifier and geometry check to the station transaction rather than letting the expected programme name overwrite the received part ID.
Variant identity must carry width, length, tip cut, rolling direction and sequence position. Use mass only as a qualified cross-check for variants whose geometry creates a resolvable mass difference.
A successful handover links one physical part to one permitted receiving task and one confirmed transfer event. That is the evidence needed to distinguish a correct-looking lamination from the correct lamination for this stack.
References
- NIST, Combinatorial Testing, programme and method overview.
- Nippon Steel Corporation, Grain-Oriented Electrical Steel Sheets, catalogue D004je, April 2020, specification and typical-property tables.