Molds & Tooling
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PPS Draft Angle
Problem Phenomenon
Parts are scratched during demolding and show ejector whitening, deep-cavity parts deform, and the yield rate fluctuates
Cause Analysis
PPS has high rigidity and high brittleness, and cracks easily under demolding force; the draft angle is 0.25-1° according to depth; the ejection system needs large-area balance; polishing reduces demolding resistance
Solution
①Draft angle 0.25-1°; ②Ejector pins arranged in large-area balance; ③Cavity polishing to reduce scratching; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS demolding must accommodate its brittleness; the three elements of draft angle, balanced ejection, and polishing are all indispensable; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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