Molds & Tooling
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PA66 thick-walled part mold temperature
Problem Phenomenon
PA66 thick-walled structural parts internal shrinkage voids, X-ray inspection unqualified
Cause Analysis
When thick-walled part mold temperature is low, the surface layer solidifies first, the core feeding channel freezes forming shrinkage voids; holding pressure cannot penetrate the solidified layer; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Raise thick-walled part mold temperature to 100-120℃ to delay solidification; thicken the gate to keep the feeding channel; holding pressure and time calculated by wall thickness; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Thick-wall shrinkage voids are solved by high mold temperature plus effective feeding channels; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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