Injection-Molded Shell Auto Test & Sorting Equipment

The equipment was delivered in 2025 to an automotive electronics EMS manufacturer (shown as an industry-generic description under customer confidentiality constraints), replacing a manual offline sampling process for injection-molded shells. Offline sampling tested only a fraction of production, so an insulation or sealing defect could be missed batch after batch; manual judgments varied between operators, and results written on paper could not support per-piece traceability or a customer quality audit. The inline line was specified to close all three gaps at once — detection consistency, automatic containment and archived data.

Automatic load and unload brackets the test process: shells are fed from the input side and located on shared tooling, moved between stations without manual handling, and discharged on the output side after the final judgment. Because the same locating datum is used at every station, a part is never re-clocked or re-seated mid-cycle, which removes the positioning variation that manual loading introduces and keeps the line paced by test time rather than by handling time.

The first test is dielectric withstand: the station applies the specified test voltage to each shell and automatically judges leakage current against the limit and whether breakdown occurred. Voltage, ramp and hold time follow the applicable product standard and customer specification and are stored as per-model recipes, so the pass/fail decision is made by fixed electrical criteria rather than by an operator reading an instrument. A shell that fails the dielectric judgment is flagged immediately and never proceeds to a sealing test under a false-good status.

The second test is airtightness: the cavity is sealed and pressurized, and the station measures pressure decay, direct pressure or flow against the allowed leak rate, with the method chosen from cavity volume, leak limit and takt. Like the electrical parameters, the leak criteria and hold time are fixed per product drawing and recalled per model, so every shell is judged against the identical sealing threshold. The station performs the leak/water-ingress judgment directly in the line rather than sending samples to a separate bench.

Dielectric and airtightness testing are integrated on one line with a single load-in, which is the core of the multi-parameter design: a shell moves through electrical and sealing stations in sequence instead of being loaded, unloaded and re-queued at separate machines. Fewer hand-offs mean fewer station changes, less floor space and no queue of parts waiting between processes, and the same platform can be extended with a visual or dimensional station when a product requires it.

After the final judgment, pass and fail parts are sorted automatically into separate lanes: a conforming shell exits with the accepted stream while a failed shell is diverted to a reject lane, physically preventing escape and eliminating the mixed-part risk that manual sorting creates. The sorting action is driven directly by the test verdicts rather than re-entered by an operator, so a dielectric or leak failure cannot be misrouted, and the interlock holds until the reject part clears the station.

Every shell carries its own data record: the withstand and airtightness results are archived at per-unit granularity for batch and per-piece traceability, with standard protocols available to connect the line to MES and SCADA. The record set is structured to support the quality-record requirements of an IATF 16949 audit, so a customer can pull the electrical and sealing history of any delivered piece instead of relying on sampling paperwork. Data capture happens inline at the stations, adding no separate logging step to the cycle.

The defining operating rule is that every piece runs the identical test program — same voltage and hold sequence, same pressurization and leak threshold, same judgment logic — which is what converts a sampling process into 100% inline inspection and removes human misses and operator-to-operator variation. The line therefore fits high-volume automotive-grade production, where consistent per-piece verification, automatic containment and archived results matter more than the flexibility of a manual bench. The equipment is designed and built to automotive-grade quality requirements across the full test, sort and data flow.