Extrusion & Post
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PMMA Extruded Sheet High Internal Stress
Problem Phenomenon
Extruded acrylic sheets frequently crack during machining, while cast sheets with the same process are fine
Cause Analysis
The extrusion process freezes molecular orientation, forming higher internal stress; extruded sheets have lower stress tolerance than cast sheets, and design parameters and machining allowances must be treated differently; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Choose low-stress cast sheets for high-requirement parts; ②anneal extruded sheets before machining; ③avoid stress concentration structures in extruded sheet design; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The essential difference between cast and extruded sheets lies in stress level; clarify sheet type during material selection; annealing extruded sheets before machining is an iron rule; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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