Processing Machinery
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PA66 product stress cracking
Problem Phenomenon
Cracks after contacting medium, high-stress parts crack first.
Cause Analysis
Internal stress + chemical medium; PA66 is sensitive to certain chemicals; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; during troubleshooting, confirm item by item around key factors such as stress cracking and medium to avoid misjudgment.
Solution
①Reduce internal stress; ②conduct medium compatibility/immersion verification before mass production; ③change sharp corners to rounded transitions to eliminate stress concentration; ④optimize assembly design to avoid excessive interference; ⑤perform annealing when necessary to accelerate stress release and dimensional stabilization.
Key Takeaway
PA66 cracking='stress + medium': reduce stress and avoid medium on both fronts; internal stress management is a long-term subject for nylon parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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