Processing Machinery
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Core-Surface Crystallization Stress Cracking of Large PEEK Parts
Problem Phenomenon
【Problem Phenomenon】Large PEEK parts with a diameter above 6.3cm develop internal cracks during storage or use
Cause Analysis
The difference in crystallization rate between the core and surface of large parts forms internal stress; when the stress exceeds the material strength, cracking occurs; thick-walled extruded rods and compression molded parts have the highest risk; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
After molding, large parts are annealed at 300℃ for several hours to homogenize crystallization and eliminate stress; the '2079851475616104453 reduces speed and cools slowly to reduce the crystallization gradient; thick-walled part design reserves an annealing process
Key Takeaway
6.3cm is the stress threshold for large PEEK parts; high-temperature annealing is a must; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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