Processing Machinery
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PA66 warpage
Problem Phenomenon
Product warpage, obvious on flat parts.
Cause Analysis
Shrinkage 1.5%~2.5% and anisotropic; uneven cooling, improper holding; fiber orientation in GF grades aggravates it; differential shrinkage of crystalline materials is the root cause; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Balanced mold temperature control at 80~100℃; ②optimize holding pressure and switchover point, taking into account both feeding and internal stress; ③optimize wall thickness uniformity to reduce differential shrinkage; ④adjust gates for GF parts; ⑤use shaping fixtures to constrain cooling after deformed parts are ejected.
Key Takeaway
PA66 warpage='shrinkage anisotropy management': balance mold temperature, restrain holding pressure, optimize gates; GF grades especially need adjustment at the fiber orientation source; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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