Molds & Tooling
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Ejection deformation of PP thin-wall parts
Fenómeno del problema
The product deforms or is even punctured during ejection, especially prominent for deep-cavity thin-wall parts.
Análisis de la causa
An unbalanced ejection system concentrates the ejection force; thin-wall parts have low rigidity, and ejection is more likely to deform when the demolding temperature is high.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solución
①Balance the ejection system and increase the ejector pin cross-sectional area; ②place more ejector pins near areas with high demolding resistance; ③extend cooling to lower the ejection temperature; ④use combined pneumatic and mechanical ejection for deep-cavity parts.
Conclusión clave
The principle of thin-wall part ejection design is distribution and balance; a composite ejection method is recommended for soft PP deep-cavity parts.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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