Processing Machinery
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PA6 Automotive Engine Cover
Problem Phenomenon
The engine decorative cover shows deformation and abnormal noise after high-low temperature cycling
Cause Analysis
The engine compartment temperature is high and fluctuates greatly; ordinary PA6 has insufficient heat deflection temperature and large creep, and after deformation under long-term thermal load, it interferes with surrounding parts causing abnormal noise; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Select glass-fiber reinforced heat-stabilized PA6 grades with a heat deflection temperature (1.8MPa) above 180°C; add ribs to the structure and leave thermal expansion clearance; verify according to the vehicle high-low temperature cycling test
Key Takeaway
Engine compartment parts must have glass-fiber reinforcement plus a heat stabilization system, verified under vehicle working conditions; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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