Molds & Tooling
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POM precision dimension ±0.05
Problem Phenomenon
Precision POM part dimensions are difficult to keep stably within ±0.05mm, drifting between batches
Cause Analysis
POM's low water absorption and uniform shrinkage give it ±0.05mm accuracy potential; but mold temperature fluctuations, unstable holding pressure, and post-crystallization can all break through the tolerance band, requiring steady-state control of the whole chain
Solution
①Use a mold temperature controller for precise temperature control with a temperature difference of ±1°C; ②scientifically determine the holding pressure switchover point; ③inspect precision parts after annealing and analyze process capability; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM's accuracy potential needs a steady-state process to be realized; the three links of temperature control, switchover, and annealing are locked, and SPC monitoring ensures consistency; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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