Injection Molding
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Stress cracking of PA6 injection molded products
Problem Phenomenon
Cracking after contact with grease and solvents.
Cause Analysis
PA6 is sensitive to certain chemicals, internal stress + medium induces cracking; high-stress areas crack first; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Reduce internal stress; ②conduct medium compatibility/immersion verification before mass production; ③fillet design; ④optimize assembly design to avoid excessive interference; ⑤perform annealing treatment when necessary to eliminate residual stress.
Key Takeaway
PA6 cracking='stress + medium': reducing stress and avoiding the medium on both fronts; nylon internal stress management must be addressed from both process and structure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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