Processing Machinery
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PA6 Hot Oil Aging
Problem Phenomenon
After long-term use, PA6 engine compartment parts show surface cracking and strength decline
Cause Analysis
High temperature and engine oil medium jointly accelerate PA6 oxidative degradation, and additives in hot oil may also cause chemical attack, with aging expanding from the surface layer to the interior; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
Select heat-aging-resistant grades (containing heat stabilizer systems) for engine compartment parts; periodically perform hot oil aging verification according to standards; replace parts with surface cracking in time to prevent fracture failure
Key Takeaway
For hot oil environments, heat-stabilized grades must be selected and aging verification performed; after confirming effectiveness, solidify 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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