Processing Machinery
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ASA Cracking Delayed Failure
Problem Phenomenon
【Problem Phenomenon】ASA products pass at factory, crack after a period of outdoor use
Cause Analysis
Residual internal stress is delayed released under UV, temperature cycling and load; assembly stress and thermal expansion mismatch superimpose; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
High-stress parts annealed; assembly reserves thermal expansion gap; outdoor parts do accelerated aging verification; 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
ASA delayed cracking is a stress account, annealing plus aging verification prevents; 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 subsequent similar problems
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