Molds & Tooling
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PMMA Laser Cutting Edge Stress
Problem Phenomenon
Microcracks appear at sheet edges after laser cutting and propagate during subsequent use.
Cause Analysis
The laser heat-affected zone generates thermal stress, and microcracks initiate at edge stress concentrations; the problem worsens when sheet internal stress is high.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
①Anneal after cutting to eliminate edge stress; ②optimize laser power and speed; ③select low-stress sheets; ④edge polishing treatment.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
The thermal influence of laser processing needs supporting post-treatment; annealing and edge treatment can eliminate crack hazards.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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