Risers efficient columnar riser shape and casting method

摘要

The present invention I provide a high columnar shape of the feeder of the feeder efficiency than a conventional cylinder to risers that basic shape. A Diameter D and height pillar in the H / D ≧ 3 of H, and the feeder volume to the riser shape is less than or equal to 40% with respect to the volume of the product section. .BACKGROUND