Abstract: For the purpose of providing a method of die cast product of spheroidal graphite cast iron and a die cast product of spheroidal graphite cast iron having the number of spherical graphites of 3000/mm2 or more in an as cast state, there is disclosed a method of die cast product of ultrafine spheroidal graphite cast iron, including the steps of: a melting step of heating and melting raw materials made of cast iron to obtain source melting metal; a spheroidizing treatment step in which a spheroidizing treatment is performed; an inoculation step of inoculating; and a casting step of casting in a die mold. The amount of nitrogen is adjusted so that the amount of nitrogen generated in the time of melting becomes 0.9 ppm (mass) or less.

Abstract: For the purpose of providing a method of die cast product of spheroidal graphite cast iron and a die cast product of spheroidal graphite cast iron having the number of spherical graphites of 3000/mm2 or more in an as cast state, there is disclosed a method of die cast product of ultrafine spheroidal graphite cast iron, including the steps of: a melting step of heating and melting raw materials made of cast iron to obtain source melting metal; a spheroidizing treatment step in which a spheroidizing treatment is performed; an inoculation step of inoculating; and a casting step of casting in a die mold. The amount of nitrogen is adjusted so that the amount of nitrogen generated in the time of melting becomes 0.9 ppm (mass) or less.

Abstract: In a method for producing a salt core for casting formed by a molten salt made of a salt mixture containing sodium salt, first, a melt is formed by heating a salt mixture. Next, a mold for core molding is heated to a temperature higher than about 0.52×Tm and lower than about 0.7×Tm. Note that Tm represents the liquidus temperature of the salt mixture as an absolute temperature (K). Then, the melt is poured under pressure into the mold heated as described above. A salt core for casting is molded by solidifying the melt inside the mold.

Abstract: An object is to provide an electromagnetic stirrer that can provide an excellent stirring force more than before. An electromagnetic stirrer has a vertical electromagnetic field generating coil (1) vertically and circumferentially provided on the outer side of a container (5), and a rotational electromagnetic field generating coil (2) provided on the outer side of the vertical electromagnetic field generating coil (1), in which an iron core (3) is inserted between the vertical electromagnetic field generating coils (1) and between the rotational electromagnetic field generating coils (2), the iron core (3) being formed of a magnetic material with magnetic isotropy and having comb teeth 3a extended to the inner surface of the vertical electromagnetic field generating coil (1).

Abstract: An object is to provide an electromagnetic stirrer that can provide an excellent stirring force more than before. An electromagnetic stirrer has a vertical electromagnetic field generating coil (1) vertically and circumferentially provided on the outer side of a container (5), and a rotational electromagnetic field generating coil (2) provided on the outer side of the vertical electromagnetic field generating coil (1), in which an iron core (3) is inserted between the vertical electromagnetic field generating coils (1) and between the rotational electromagnetic field generating coils (2), the iron core (3) being formed of a magnetic material with magnetic isotropy and having comb teeth 3a extended to the inner surface of the vertical electromagnetic field generating coil (1).

Abstract: An expendable salt core has the shape of a water jacket by, e.g., die casting using a salt of bromine and at least one of sodium and potassium, and a salt of carbonic acid and at least one of sodium and potassium. The expendable salt core is formed to contain at least one of potassium and sodium as a cation, and bromine and carbonic acid as anions. For example, the expendable salt core is formed by casting using a melt obtained by melting a salt mixture of sodium bromide and sodium carbonate.

Abstract: A die casting method for forming an expandable salt core includes, first, a salt mixture containing at least a potassium salt and a sodium salt is melted by heating to obtain a melt. Subsequently, the temperature of the melt is decreased to set the melt in a semi-solidified (solid-liquid coexisting) state. The melt in the semi-solidified state is injected into a metal mold under a high pressure and solidified. After solidification, the obtained expendable salt core is taken out of the metal mold.

Abstract: A salt core (2) is formed by casting a mixed material of a salt material and a ceramic material. Any one of a chloride, bromide, carbonate, and sulfate of potassium or sodium is used as the salt material. As the ceramic material, granular one having a density falling within a range of 2.2 g/cm3 (exclusive) to 4 g/cm3 (inclusive) is used.