Method and apparatus for producing cast steel article

An apparatus for producing a cast steel article, said apparatus comprising:

• a permeable mold having a sprue, a cavity in communication with the sprue, and at least one rise/run-off portion in communication with the cavity, said permeable mold being provided with a hole having an opening on a mold surface, said hole terminating at a location in said mold and spaced from and adjacent to said rise/run-off portion;
• and
• a vacuum apparatus having a suction pipe with an opening which is brought into contact with said hole of said permeable mold, wherein the air is sucked from said hole by said vacuum apparatus drawing the air from said rise/run portion through said permeable mold and into said hole, in order to conduct the casting of said article at reduced pressure.

An apparatus for producing a cast steel article, said apparatus comprising a permeable mold having a sprue, a cavity in communication with the sprue, and at least one rise/run-off portion in communication with the cavity, said permeable mold being provided with a hole having an opening on a mold surface, said hole terminating at a location in said mold and spaced from and adjacent to said rise/run-off portion;

• and a vacuum apparatus having a suction pipe with an opening which is brought into contact with said hole of said permeable mold, and at least one high-gas permeability member having a larger gas permeability than that of said permeable mold being disposed in said permeable mold between said hole and said rise/run-off portion and/or said cavity, wherein air is sucked from said hole by said vacuum apparatus, in order to conduct the casting of said article at reduced pressure.

An apparatus for producing a cast steel article, said apparatus comprising a permeable mold having a sprue, a gate in communication with the sprue, a cavity in communication with the gate, and at least one rise/run-off portion in communication with the cavity, and a vacuum apparatus having a vacuum pump and a suction pipe, said permeable mold being provided with a hole having an opening on a mold surface, said hole terminating at a location in said mold and spaced from and adjacent to said rise/run-off portion, said cavity containing at least one hollow, permeable core, one end of which is connected to said hole via a high-gas permeability member having a larger gas permeability than that of said permeable mold, the air being sucked from said hole by said vacuum apparatus, in order to conduct the casting of said article at reduced pressure.