Processing Machinery
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PMMA Sheet Hot Bending Springback
Problem Phenomenon
After hot bending and setting, the sheet slowly springs back, the angle is out of tolerance, and batches are inconsistent
Cause Analysis
Release of internal stress after PMMA hot bending causes the bending angle to spring back; insufficient setting time and overly fast cooling aggravate springback; extruded sheets have high stress and more obvious springback; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①After hot bending, keep sufficient cooling time in the setting mold; ②step cooling 60℃→40℃→room temperature; ③anneal and set high-precision parts after hot bending; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The essence of hot bending springback is stress relaxation; step cooling plus sufficient setting locks the angle at the design value; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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