Key parameters and optimization methods:
Injection speed:
Low-speed stage (0.1–0.5 m/s): Prevents splashing and gas entrainment.
High-speed stage (main filling stage): Adopt higher speeds (higher than those for aluminum alloys) to offset the rapid heat dissipation characteristic of magnesium melt.
Boost pressure:
Apply high pressure during the initial solidification stage (typically higher than for aluminum alloys) to compensate for shrinkage and improve density. The start position of the boost pressure should be triggered earlier to avoid premature solidification of the magnesium melt.
Vacuum assistance:
Use a vacuum system (vacuum level ≤50 mbar) to reduce gas entrainment in the cavity and lower porosity.
Logical link: The combination of "high-speed filling + high-pressure shrinkage compensation + vacuum exhaust" achieves efficient filling and a dense structure.
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