Molding Process
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ABS brittle cracking——metal insert stress
Problem Phenomenon
ABS products with metal inserts show cracks around the insert.
Cause Analysis
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.
Solution
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.
Key Takeaway
Insert parts need preheating, and sufficient interface wall thickness must be reserved.
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