| 摘要 |
PURPOSE:To produce a centrifugally cast perforated pipe at one time, by providing many holes to a cylindrical metal mold and inserting and penetrating cores therein to form a casting mold and charging molten metal into the mold while rotating the same horizontally in the axial direction. CONSTITUTION:Many holes 22 are provided to a cylindrical metal mold 21, and cores 3 are inserted into the holes 22 to form a casting mold. The holes 22 are tapered so as to have the diameter decreasing from the inside toward the outside, and the cores 3 are formed to the shape corresponding to the shape of said holes 22. The part thereof projecting to the inside when core is inserted into the hole is made larger than the wall thickness of a pipe to be cast and the part projecting to the outside is formed to a proper length. Such casting mold is maintained horizontally and is rotated, then molten metal is charged therein. When the molten metal solidifies, the cores 3 are hammered from the outside to the inside and are removed, whereafter a cast body 5 is removed. The centrifugally cast perforated pipe is thus produced at one time. |
