Molds & Tooling
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PSU Large Runner and Gate Design
Problem Phenomenon
[Problem Phenomenon] PSU has high flow resistance with concentrated pressure loss; gate freeze-off causes insufficient compensation
Cause Analysis
PSU high melt viscosity requires runners and gates as large as possible; small runners and gates have large pressure loss and freeze early; multiple gates are recommended for thin-wall long-flow parts; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based solely on experience
Solution
Design runner and gate sizes at the upper limit; use multi-gate layout for thin-wall long parts; select fan or overlap gate types to reduce shear; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU runners and gates are better large than small; pressure loss and freezing both arise from smallness; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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