Molds & Tooling
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Dimensional Accuracy Out of Tolerance of PEEK
Problem Phenomenon
Critical dimensions of PEEK precision parts drift between batches, assembly fits are out of tolerance, and dimensions produced by the same mold at different time periods are inconsistent.
Cause Analysis
PEEK crystallinity is affected by mold temperature and cooling rate, and crystallinity differences are directly converted into shrinkage differences; process temperature fluctuation, back pressure drift, and unstable holding switchover points all amplify dimensional scatter.
Solution
①Stabilize mold temperature and melt temperature control accuracy within ±3℃; ②Fix the holding switchover position and monitor with cavity pressure; ③Regularly check back pressure and screw speed; ④Analyze dimension and crystallinity data in linkage.
Key Takeaway
PEEK dimensional accuracy is essentially a process stability problem; ±3℃ temperature control is the bottom line for precision parts; cavity pressure monitoring reflects true filling consistency better than machine parameters.
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