Molds & Tooling
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ABS product brittle cracking——ejection system imbalance
Fenómeno do problema
Thin-wall or complex-structure parts show white marks, cracks, or even puncture during ejection; the cracks are concentrated at the ejection load-bearing areas and are directly related to the ejection action.
Análise das causas
Ejector pins are skewed and loaded unevenly, or the ejector pin cross-sectional area is too small and the distribution is unreasonable, causing local stress concentration at the moment of ejection, cracking the product; when cooling is insufficient, the product strength is low and it is more easily damaged by ejection; thin-wall complex parts are especially sensitive.
Solução
①Level the ejection device to ensure verticality and load balance; ②increase the ejector pin diameter and optimize the ejector pin distribution to disperse the ejection force; ③add ejection buffering when necessary to reduce ejection impact; ④appropriately extend the cooling time to increase the product strength at ejection; ⑤arrange the ejection points at areas of high rigidity.
Conclusão principal
For ABS ejection cracking, check the ejection mechanism first rather than the material: balancing the ejection force, increasing the load-bearing area, and giving sufficient cooling are the three axes; the ejection cracking location is often the ejector pin location, and following the ejector pins to find the cause is the fastest.
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