Extrusion & Post
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Deformation of PEEK After Annealing
Problem Phenomenon
After annealing to relieve stress, PEEK products instead warp and deform, dimensions change, and the yield rate drops instead of rising.
Cause Analysis
When the annealing temperature approaches or exceeds the material's tolerance limit, crystalline structure reorganization is accompanied by shrinkage change; the product deforms freely without constraint during annealing, and internal stress release is converted into shape change.
Solution
①Strictly control annealing temperature and time, below the thermal deformation safety boundary; ②Fixture the product to set its shape before annealing; ③Use gradient heating and cooling to avoid thermal shock; ④Verify post-annealing dimensions on the first article before batch execution.
Key Takeaway
PEEK annealing is a double-edged sword — only standardized process can maximize benefits and avoid harm; annealing with fixtured shape-setting balances stress release and shape retention; any annealing specification must pass first-article verification.
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