Molds & Tooling
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PA6 Insufficient Draft Angle
Problem Phenomenon
Deep-cavity PA6 products are scratched during demolding, with parallel scratches on the surface
Cause Analysis
Insufficient draft angle causes large friction between the product and the cavity, and PA6 surface hardness is not high so it is easily scratched; cavity polishing direction inconsistent with demolding direction aggravates scratching; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
Design cavity draft angle at 0.5-1°, taking the upper limit for deep cavities; mirror-polish the cavity along the demolding direction; use release agent as a transition; raise mold temperature to reduce gripping
Key Takeaway
Draft angle and polishing direction of deep-cavity products are the design premises for scratch prevention; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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