Molding Process
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PSU Shrinkage and Dimensional Accuracy
Problem Phenomenon
[Problem Phenomenon] Dimensional accuracy of PSU products is hard to control; shrinkage compensation basis is insufficient
Cause Analysis
PSU molding shrinkage is low and stable (about 0.6-0.7%); low molecular orientation makes directional shrinkage differences small; accuracy problems mostly stem from process fluctuations rather than the material itself
Solution
Design mold compensation according to the low shrinkage in the data sheet; lock process parameters to reduce fluctuations; uniformize mold temperature for precision parts and perform first-article full-dimension verification; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU low shrinkage and low orientation are a blessing for accuracy; fluctuations mostly come from unstable process; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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