Extrusion & Post
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Stress Annealing of PEEK After Machining
Problem Phenomenon
[Problem Phenomenon] PEEK precision machined parts drift in dimension after storage and show stress cracking after assembly
Cause Analysis
Residual stress introduced by '2079851475616104452 and machining is released during storage and service, causing dimensional change and cracking; Victrex recommends a maximum holding temperature of 250℃ for stress-relief annealing
Solution
Treat according to the annealing procedure after machining, taking the holding temperature below 250℃ for stress relief; finish-machine precision parts to final dimensions after annealing; fully inspect critical dimensions after annealing
Key Takeaway
The dimensional stability of PEEK precision parts is backed up by stress-relief annealing below 250℃; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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