Molding Process
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PA12 SLS Powder Bed Preheating Temperature
Problem Phenomenon
【Problem phenomenon】SLS printed PA12 parts had warpage deformation, incomplete sintering, or powder caking coexisting
Cause Analysis
Powder bed preheating must be close to the lower limit of the melting point: 170-180℃ (10-20℃ below the melting point) balances fluidity and sintering stability; too low causes insufficient sintering and weak interlayers, too high causes powder caking and dimensional drift
Solution
Set the powder bed temperature at 170-180℃ and calibrate uniformity by zone; monitor bed surface temperature difference with thermal imaging; fine-tune preheating in combination with laser parameters; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
170-180℃ powder bed is the core of the SLS window, and bed surface temperature difference must be monitored by thermal imaging; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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