Molds & Tooling
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ABS sink mark and shrinkage void
Fenómeno del problema
[Problem Phenomenon] ABS thick-wall rib position sink mark or internal shrinkage void, holding pressure effect inconsistent
Análisis de la causa
Thick-wall outer layer solidifies first and internal shrinkage pulls in; insufficient holding pressure or early gate freezing cuts off feeding; rib position too thick is the structural cause; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solución
Raise holding pressure to 50-70% with extended time; halve rib thickness; reduce material and strengthen cooling in thick areas; after adjustment, continuously sample to verify the effect, resume mass production only after confirming stability; change only one variable each time and record parameter changes to facilitate locating effective measures
Conclusión clave
For ABS sink mark check wall thickness and rib thickness first, holding pressure feeding follows; 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 similar problems later
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