Risers and Gating

Riser Design
The risers in the mold serve as reservoirs to feed molten metal into the casting to prevent porosity forming in isolated sections during solidification.

Proper design (location, number, and size) of the risers is critical to prevent porosity caused by solidification shrinkage.

-- The risers should provide metal feed into the heavy sections of the casting which are the last to solidify.

-- But the risers must be placed so that they can be cut off without leaving undesirable grinding marks.

Two riser designs were considered --

Design A -- Two Risers on the Rim -- two cone shaped risers placed on the sides of the wheel feeding into the top and bottom rims.

Design B - - One Riser on the Hub -- a single large cylindrical riser placed over the hub.

Choose the riser design which will best feed into the casting without producing a cut-off and grinding challenge.
Two Risers on the Rim or One Riser on the Hub

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Select a design