Molding Process
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PMMA Drilling Technology
Fenómeno do problema
During drilling, the sheet edges chip and crack, hole walls are rough, and threaded connections crack
Análise das causas
Improper drill bit angle and overly fast feed cause hole edge chipping; the drill bit angle should be 60-90°; thin sheets can be scored and snapped instead of drilled; hole edge stress concentration is the root cause of thread cracking
Solução
①Drill bit angle 60-90° with sufficient cooling; ②low-speed feed to prevent edge chipping; ③enlarge the pilot hole of threaded holes and avoid direct tapping stress; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Conclusão principal
PMMA drilling relies on angle and cooling; a 60-90° drill bit plus low-speed feed are the basic parameters to prevent edge chipping; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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