Processing Machinery
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PARA Internal Cracks
Problem Phenomenon
Internal cracks in PARA products; too-fast cooling and residual stress act together, with strength loss in severe cases.
Cause Analysis
Too-fast product cooling with internal-external temperature difference stress; residual stress frozen in; cooling differences in thick-wall zones; improper high-mold-temperature material management.; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
①Raise mold temperature; ②Immerse the product in hot water or place it in an oven to cool slowly after taking it out; ③Reduce injection speed; ④Annealing treatment.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Cooling management for PARA internal cracks runs through in-mold and out-of-mold; slow cooling in hot water or an oven is a practical post-treatment; stress relief needs temperature and time.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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