The model of a copper piece to be manufactured by sand mold casting. The model has a volume of 313763.12 mm3 and its surface area is 40737.98 mm2. It is recommended: to use two upper cylindrical risers of Hmz = 1.36 Dmz whose diameter is 212.0 mm.

The minimum amount of material that needs to be melted to fill the piece and all parts of the sand mold, in kg? Assume the volume of the sprue and channel is 10% of the volume of the part model.

data: density of copper 8.96 g/cm3