Processing Machinery
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ABS delayed cracking
Problem Phenomenon
[Problem Phenomenon] ABS qualified at factory, cracks after use
Cause Analysis
Residual internal stress released with delay under thermal cycling, solvent, and load; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry materials and should be confirmed first during troubleshooting
Solution
Anneal high-stress parts; environmental stress cracking assessment; avoid stress concentration in assembly; after adjustment, continuously sample to verify the effect, resume mass production only after confirming stability; change only one variable each time and record parameter changes to facilitate locating effective measures
Key Takeaway
ABS delayed cracking is a stress account, annealing and assessment 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 later
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