Molding Process
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PMMA Vehicle Lamp Lens
Problem Phenomenon
Vehicle lamp PMMA lenses have good scratch resistance but crack under stone impact, and craze where sealant contacts
Cause Analysis
PMMA vehicle lamp lenses have better scratch resistance than PC but are more brittle; solvent components in sealants and cleaners induce stress cracking; superimposed vibration stress accelerates failure
Solution
①Design lenses to avoid sharp-angle stress concentration; ②choose PMMA-compatible sealants; ③anneal before assembly to reduce residual stress; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Three defense lines for PMMA vehicle lamp parts: smooth structure, chemical compatibility, and pre-assembly annealing; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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