Molds & Tooling
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ABAK dimensional stability improvement
Fenómeno del problema
ABAK replaces pure PA to solve dimensional instability problems, but shrinkage management of the alloy itself still requires attention.
Análisis de la causa
Pure PA has a high water absorption rate, causing dimensional expansion of 1~2% and fluctuation of mechanical properties; ABAK alloy utilizes the low water absorption characteristics of ABS to improve dimensional stability; however, the alloy shrinkage rate of 0.6~1.0% still requires mold compensation; there are still slight changes after water absorption.
Solución
①Utilize the low water absorption advantage of the alloy; ②design the mold according to a 0.6~1.0% shrinkage rate; ③leave mold correction allowance for critical dimensions; ④verify dimensions in wet state.; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
ABAK dimensional stability is a significant improvement over pure PA; however, precise management of shrinkage and water absorption is still necessary; wet-state verification covers the service environment.; After confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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