Molds & Tooling
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Post-shrinkage dimensional change of ABS parts
Problembeschreibung
The product dimensions continue to change slightly after being placed for 24~72 hours, precision assembly is affected, and the measurement results are inconsistent before and after.
Ursachenanalyse
After demolding, the residual stress relaxes and the material continues to shrink, more obvious at thick-wall areas; inconsistent measurement timing (just demolded vs after placement) causes the illusion of 'dimensional drift', which is actually normal post-shrinkage.
Lösung
①Uniformly specify the measurement aging (e.g., 24 hours after molding); ②fully cool and shape before demolding; ③anneal to accelerate stress release when necessary; ④correct the mold shrinkage rate according to actual measurement; ⑤SPC tracking of aging for key dimensions.
Wichtigste Erkenntnis
For ABS dimensions, first 'unify the measurement time point' before talking about compensation: standardize the measurement aging, and many 'drifts' disappear; residual stress relaxation is gradual, and aging management is the key.
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