Processing Machinery
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PCABS Delayed Cracking
Problem Phenomenon
[Problem Phenomenon] PC/ABS passes factory inspection but cracks after a period of use
Cause Analysis
Residual internal stress is released delayed under thermal cycling, solvents, and load; the stress relaxation characteristics of the PC phase; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Anneal high-stress parts; evaluate environmental stress cracking; avoid stress concentration in assembly design; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PC/ABS delayed cracking is a stress account; annealing and evaluation prevent it; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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