Molds & Tooling
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PA12 Demolding Difficulty and Ejection Breakage
Fenómeno do problema
【Problem phenomenon】PA12 products stuck to the mold during demolding and broke during ejection, with a low yield rate
Análise das causas
Insufficient demolding taper, poor surface finish, improper ejector pin position, or too-small diameter are the main causes; PA12 has good toughness, but concentrated ejection force on thin-wall parts can still break them; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
Increase the demolding taper and polish the mold surface; increase the number of ejector pins or enlarge the diameter to equalize ejection force; extend cooling time and appropriately lower barrel and mold temperature; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
For demolding problems, first check taper and polishing; equalize ejection to prevent local breakage; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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