Molds & Tooling
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PMMA Product Dimensional Shrinkage Out of Tolerance
Fenómeno do problema
Precision optical parts are out of dimensional tolerance, and shrinkage deviates from the design value.
Análise das causas
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.
Solução
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.
Conclusão principal
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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