Molds & Tooling
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ABS sink mark thick wall and rib
Problem Phenomenon
ABS sink mark on thick walls and ribs, core melt time long and surface pulled inward, rib designed at 50-60%.
Cause Analysis
ABS sink mark wall too thick, core melt time longer than skin; surface pulled inward; rib thickness 50-60% of nominal wall thickness; holding pressure and time; gate position.
Solution
①Rib thickness 50-60%; ②increase holding pressure; ③gate near thick wall; ④uniform wall thickness; ⑤structural design.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Rib design and holding pressure are the main countermeasures for ABS sink mark; uniform wall thickness is prevention; gate position affects feeding.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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