Extrusion & Post
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PC Silver Streaks Reappearing After Post-Processing
Problem Phenomenon
PC parts develop fine cracks after machining or polishing.
Cause Analysis
Internal stress is released after mechanical processing removes the surface constraint, superimposed with processing heat and tool stress to induce cracks.
Solution
①Reduce '2079851475616104452 residual stress (low holding pressure, high mold temperature); ②Anneal before processing; ③Use sharp tools, small feed, and sufficient cooling for processing.
Key Takeaway
Reduce internal stress first, then machine.
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