Material Drying
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PA6 Product Drop Fracture
Problem Phenomenon
Drop fracture along weld lines/sharp corners.
Cause Analysis
Weak weld lines + sharp corner concentration + dry-state brittleness; the three superimpose and amplify the failure risk; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Adjust the gate to keep weld lines away from stressed areas;②change sharp corners to rounded transitions to eliminate stress concentration;③perform conditioning treatment before assembly to restore toughness and stabilize dimensions;④strengthen drying and verify that the moisture content meets the standard with a moisture measurement method;⑤structurally strengthen weak locations (rounded corners, reinforcing ribs).
Key Takeaway
PA6 drop = 'path analysis': check where it breaks; weld lines, sharp corners, and dry-state brittleness are the three high-incidence areas and must be eliminated in a targeted manner; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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