Material Analysis
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PMMA First Article Optical Verification
Problem Phenomenon
Optical defects found after mass production of transparent parts; the first article only underwent dimensional inspection
Cause Analysis
Dimensional inspection cannot find defects such as haze, stress patterns, and weld lines on PMMA optical parts; the first article must include light transmittance and stress inspection to intercept batch risks
Solution
①First article undergoes four verifications: appearance, dimensions, light transmittance, and stress; ②check stress distribution with a polarizer; ③mass production after parameter locking; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
First articles of PMMA optical parts must be optically examined; four verifications plus polarized stress inspection are the institutional bottom line; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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