Molds & Tooling
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POM multi-cavity dimensional inconsistency
Problem Phenomenon
Products from each cavity of a multi-cavity mold have systematic dimensional deviations, and cavity-by-cavity measurement confirms the deviation is fixed to the cavity position.
Cause Analysis
Unbalanced runner layout causes different filling pressures and temperatures in each cavity; differences in cooling efficiency between cavities also cause inconsistent shrinkage, forming fixed cavity-position deviations.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Optimize the runner balance layout; ②inspect cavity by cavity and correct cavity dimensions; ③balance the cooling of each cavity; ④compile dimensional data by cavity position.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Multi-cavity consistency relies on the dual balance of runners and cooling; establishing dimensional archives by cavity position can precisely guide mold repair and process compensation.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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