Molds & Tooling
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Center porosity of large parts
Problem Phenomenon
Micro shrinkage cavities or porosity appear in the center area of large thick-walled parts
Cause Analysis
The shrinkage compensation distance exceeds the material's capability, causing insufficient compensation at the far end; holding pressure attenuates along long flow paths; gate position and number are improper
Solution
Increase the number of gates to shorten the shrinkage compensation distance; use sequential valve gates for staged compensation; increase holding pressure to compensate for pressure attenuation
Key Takeaway
Gate layout and sequential injection design of large parts are the key to success
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