Processing Machinery
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PMMA Metal Insert Stress
Fenómeno del problema
PMMA cracks around metal inserts, and it appears only after a period of use, causing great harm
Análisis de la causa
The expansion coefficient difference between metal inserts and PMMA is large, and cooling shrinkage produces tensile stress; stress cracks appear delayed, and failures after installation are more harmful; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Preheat inserts to reduce temperature difference; ②thicken and round the wall around inserts; ③minimize inserts and switch to post-assembly; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PMMA insert stress is a typical delayed failure; preheating, thickening, and reducing inserts are used together; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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