Molding Process 4 조회수

ABS brittle cracking——metal insert stress

문제 현상

ABS products with metal inserts show cracks around the insert.

원인 분석

The thermal expansion/shrinkage rates of ABS and metal differ greatly; during cooling shrinkage, circumferential tensile stress is generated at the insert interface; it is more severe when the insert is not preheated.

해결 방법

①Minimize metal inserts; ②when they must be used, preheat the insert to near the mold temperature; ③ensure sufficient wall thickness around the insert and set rounded transitions; ④appropriately increase the mold temperature to slow the shrinkage difference.

핵심 요약

Insert parts need preheating, and sufficient interface wall thickness must be reserved.

ABS；insert；stress cracking；shrinkage difference；preheating

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ABS brittle cracking——metal insert stress

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