Extrusion & Post
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PMMA CNC Cracking
Fenómeno do problema
After CNC machining, PMMA sheet edges chip and hole edges whiten and crack, especially around drilled holes
Análise das causas
Dull tools and improper parameters cause stress concentration on the machined surface; extruded sheets have high internal stress and are more prone to cracking; uneven clamping pressure causes local mechanical stress; cutting heat stretches molecular chains
Solução
①Keep tools sharp and replace them regularly; ②optimize cutting parameters with layered cutting of 0.2-0.6mm; ③switch to cast sheets for high-requirement parts and anneal before machining; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Conclusão principal
PMMA CNC cracking is the superposition of stress and heat; sharp tools, layered cutting, and cast sheet annealing are applied together; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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