Processing Machinery
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PMMA CNC Melting
Problem Phenomenon
Melting zones and burrs appear on machined edges, with local yellowing and burning that cannot be removed by grinding
Cause Analysis
Excessive spindle speed with too slow feed causes frictional overheating; poor chip evacuation causes hot chips to be recut; PMMA begins to soften above 90℃, forming sticky edges; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①High speed with fast feed at 10,000-24,000rpm; ②compressed air cooling and ensuring smooth chip evacuation; ③keep the cutting edge sharp to reduce frictional heat
Key Takeaway
The core of heat management in PMMA machining is fast feed and fast chip evacuation; sticky edges are a signal that the temperature has exceeded the limit; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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