Injection Molding
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ABS injection warpage deformation
Fenómeno do problema
The product is twisted, bowed, or edge-warped after ejection, and assembly is uneven; high incidence in flat and frame-type ABS parts.
Análise das causas
Although ABS is an amorphous material with low warpage tendency, uneven cooling causes inconsistent shrinkage in various parts, producing internal stress; large wall thickness differences, too high holding pressure causing frozen stress, and deformation when the product is still hot and stressed during ejection can still cause warpage.
Solução
①Separate circuit temperature control for core/cavity, temperature difference between the two sides <5℃; ②extend the cooling time; ③reduce the holding pressure by 5%~10% each time; ④uniform wall thickness (within ±10%); ⑤balanced ejection, use a shaping fixture to cool deformed parts.
Conclusão principal
The main cause of ABS warpage is 'stress and uneven cooling' rather than crystallization shrinkage: balancing mold temperature, restraining holding pressure, and sufficient cooling are the main lines; ABS is easier to adjust than PP/PE, but ignoring uneven cooling still causes warpage.
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