Injection Molding
5 Aufrufe
PSU Dents and Sink Marks
Problembeschreibung
Dents and sink marks appear in thick-wall areas of PSU products; transparent parts show optical distortion; internal shrinkage porosity is visible on cross-section.
Ursachenanalyse
Mold temperature too high causing uneven cooling; injection and holding time too short causing insufficient compensation; injection pressure too low causing insufficient compaction; melt temperature too high aggravating shrinkage.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based solely on experience
Lösung
①Appropriately lower mold temperature (but balance stress); ②Extend injection and holding time; ③Increase injection pressure; ④Appropriately lower barrel temperature.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
Treating PSU dents requires balancing the contradiction between temperature and stress; holding time is the main adjustment means; thinning thick-wall design is the root.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!