Disintegrative core for high pressure casting, method for manufacturing the same, and method for extracting the same

• Main Author: Hirokawa, Koji
• Format: Patent
• Language: English
• Published: 29.06.2004

The present invention relates to a method for manufacturing a disintegrative core for high pressure casting, such as die casting or squeeze casting. More particularly, the present invention relates to the manufacture of complex disintegrative cores from water-soluble salts. Also, the present invention relates to such water-soluble salt cores. In addition, the present invention is concerned with a method for extracting such water-soluble salt cores. Disclosed is a method for manufacturing a disintegrative core for use in high pressure casting. The disintegrative core can be applied where a light metal such as an aluminum alloy or magnesium alloy is subjected to high pressure casting, such as die casting or squeeze casting and is manufactured from a water-soluble salt which is high in latent heat and ranges, in melting point, from 280 to 520° C. and, in heat transfer coefficient ( ), from 9.8×10to 1.2×10 W/m·° C. The water-soluble salt, alone or in combination with a fine hard powder, is melted and solidified in a core mold. Alternatively, the melt is processed into a fine powder which is then molded in a core mold. The method can be applied for the manufacture of complex shapes of cores. Also, disclosed is a method for extracting such a core from a high pressure molded product.