Injection Molding
6 조회수
POM Pits and Pockmarks
문제 현상
Pits and pockmarks appear on the part surface, different in form from sink marks, with irregular distribution
원인 분석
Pockmarks originate from insufficient feeding or poor venting: feeding fluctuation, low injection pressure, low mold temperature, and too small cushion all cause poor cavity replication; at poorly vented spots, compressed gas forms pits
해결 방법
①Increase feeding and injection pressure; ②raise mold temperature and injection speed; ③add venting and enlarge gates and runners; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
핵심 요약
Troubleshoot POM pockmarks along the three lines of feeding, mold temperature, and venting; the difference from sink marks lies in distribution pattern and causal path; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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