Processing Machinery
7 visualizaciones
PMMA Insert Cracking
Fenómeno del problema
Radial cracks around inserts in PMMA metal-insert products
Análisis de la causa
PMMA shrinkage differs greatly from metal and brittleness is high; hoop stress exceeding strength causes cracking; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Preheat inserts; enlarge wall thickness around inserts; anneal after molding; switch to PC when stress is large; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Conclusión clave
PMMA insert parts have high risk; material should be changed when necessary; 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
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!