Material Analysis
7 visualizações
COC and Metal Insert Bonding Water Leakage
Fenómeno do problema
COC insert-molded fluid parts leak at the interface during pressure testing, the leakage rate rises after thermal cycling, and the insert pull-out test is unqualified.
Análise das causas
The thermal expansion coefficients of COC and metal differ greatly, and micro-gaps are generated at the interface after cooling shrinkage; the insert surface finish is too high and lacks mechanical anchoring; the insert temperature is low during molding, and the melt is quenched, resulting in weak bonding.
Solução
①Preheat the insert to close to the mold temperature; ②knurl or groove the insert bonding surface for mechanical interlocking; ③optimize the holding pressure curve for interfacial compaction; ④dual verification by thermal cycling and pressure testing.
Conclusão principal
The interfacial sealing of COC insert parts relies on mechanical interlocking rather than material adhesion; preheating and structural design are the two pillars; verification must cover temperature cycling conditions.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!