Molds & Tooling
3 visualizações
Post-shrinkage dimensional change of ABS parts
Fenómeno do problema
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.
Análise das causas
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.
Solução
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.
Conclusão principal
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.
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!