The gating
system (sprue and gates) serves as the path by which molten metal flows into the pattern
cavity and feeds the shrinkage which develops during casting solidification. Proper design
of the gating system is critical in meeting two important requirements.
- Short flow paths and fast metal flow prevents casting
misruns due to premature solidification.
- Relatively heavy sections which will solidify more
slowly require direct gating contact to provide molten metal for feeding shrinkage during
solidification.
Two different gating designs are shown in the drawing
to the right --
- Option A- Two gates near
the top and bottom of the casting
- Option B -- Five gates,
each oriented on an attachment stud.
|
Option A --
Two gates (top and bottom) feeding over
the panel edge |
|
 |
Option B --
Five gates oriented on the mounting studs feeding over the panel edge. |
|
 |
|
