Processing Machinery
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PMMA Insert Cracking
Problem Phenomenon
Radial cracks around inserts in PMMA metal-insert products
Cause Analysis
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
Solution
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
Key Takeaway
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
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