Processing Machinery
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PCABS Multi-Stage Holding Pressure Application
Fenómeno del problema
[Problem Phenomenon] PC/ABS complex parts use single-stage holding pressure, with sink marks and flash coexisting
Análisis de la causa
Complex wall-thickness parts use multi-stage holding pressure: high pressure in the early stage to compensate for shrinkage of thick walls, and low pressure in the later stage to prevent over-holding stress; single-stage holding pressure cannot take care of both; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Set 2-3 stages of decreasing holding pressure for thick-walled complex parts; verify sink marks by sectioning and adjust; use low pressure in the final stage for stress-sensitive parts; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
For PC/ABS complex parts, use multi-stage holding pressure, first compensate for shrinkage and then reduce pressure; 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 in the future
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