Molds & Tooling
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POM mold corrosion and rust
Problem Phenomenon
Rust spots appear on the mold cavity surface, the product surface replicates pockmarks, and the rust worsens after a period of production stoppage.
Cause Analysis
The formaldehyde gas produced by POM decomposition is corrosive, and long-term contact rusts ordinary mold steel; failure to clean residual material and gas in time after shutdown accelerates corrosion.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Use corrosion-resistant steel such as S136 and NAK80 for the cavity; ②thoroughly clean residual material from the mold after production; ③spray anti-rust agent for protection; ④maintain good workshop ventilation.
Key Takeaway
Formaldehyde corrosion is a unique equipment risk in POM processing; corrosion-resistant steel and shutdown cleaning protection together can significantly extend mold life.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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