Molds & Tooling
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Runner cross-section, length, and layout design unreasonable
Problem Phenomenon
Runner cross-section, length, and layout design unreasonable
Cause Analysis
Runner cross-section too small, large resistance, difficult filling
Runner too long, large pressure loss, short shots at the end
Unbalanced runner layout, filling differences between cavities
Improper runner cold slug well design, cold slug enters the cavity
Unsmooth transition between runner and gate, producing turbulence
Solution
Increase runner cross-section to reduce resistance
Shorten runner length to reduce pressure loss
Balance runner layout to ensure uniform filling of each cavity
Reasonably design cold slug wells to prevent cold slug
Smooth transition between runner and gate
Key Takeaway
Runners need balanced layout and appropriate cross-section
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