Molds & Tooling
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PMMA Product Dimensional Shrinkage Out of Tolerance
Problembeschreibung
Precision optical parts are out of dimensional tolerance, and shrinkage deviates from the design value.
Ursachenanalyse
PMMA shrinkage is 0.4~0.7%; mold temperature and holding pressure fluctuations make actual shrinkage deviate from the compensation value; process drift between batches accumulates into dimensional out-of-tolerance.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Lösung
①Stabilize mold temperature and holding pressure; ②measure actual shrinkage to correct the mold; ③SPC monitoring of critical dimensions; ④stabilize material batches.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Wichtigste Erkenntnis
Precision optical parts rely on process stability to guarantee dimensions; SPC monitoring can detect drift trends in advance.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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