Design of the Riser System

• The risers in the top mold (the cope) serve as reservoirs to feed molten metal into the casting and to prevent solidification porosity.

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

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

-- Solidification modeling is often used as a tool to size and place the risers.

• The hinge plate is cast in a “2-on” pattern. Two riser systems for the hinge plate are shown in the drawing to the right.

Two riser systems for the hinge plates are shown in the drawing to the right.

Grede Foundries, Inc.
Milwaukee Steel Division