Gate Balancing in Multi-Cavity Injection Molds: Theory an...
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Gate balancing ensures all cavities in a multi-cavity mold fill simultaneously.
Why It Matters:
- Unbalanced fill causes overpacking in early cavities, short shots in late cavities
- Higher reject rates and longer cycle times
Manual Balancing Method:
- Run short-shot experiments at 80-90% fill
- Measure fill patterns
- Weld shut the fastest-filling gate, recut to smaller cross-section
- Iterate until all cavities fill within 5% of each other
Flow Analysis:
Simulation predicts imbalance before cutting steel. Adjust gate size, runner diameter, and layout.Melt Rotation:
Even geometrically balanced hot runners have "natural imbalance" from shear-induced temperature variation. Spiral mixing elements solve this.Practical Tips:
- Add 10-15% extra runner length for future balancing
- Document each iteration
- For >32 cavities, consider staged filling
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