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1. (WO1980001657) DIE CASTING METHOD
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/001657    International Application No.:    PCT/JP1979/000034
Publication Date: 21.08.1980 International Filing Date: 14.02.1979
B22D 17/00 (2006.01), B22D 17/10 (2006.01), B22D 17/32 (2006.01), B22D 27/11 (2006.01)
Priority Data:
JP79/00034 14.02.1979 WO
Abstract: front page image
(EN)Die casting method in which a molten metal is injected into a die cavity (30) for cast products through a sprue (31) and also applied with pressure by means of a pressure plunger (36) through a pressure channel (17) communicating with the die cavity (30) at a location other than the sprue (31). According to this invention, upon the application of pressure, the molten metal in the pressure channel (17) may be extruded into the die cavity to form an expanded flow so that the application of pressure is always carried out with a stable pressure. A part of the die-cast product solidified in the die cavity (30), which part is substantially opposed to the pressure channel (17), is cut along the moving direction of the plunger (36) across a sectional area larger than that of the pressure channel (17), in order to remove a portion where surface defects and/or segregation may be apt to grow so that the strength and/or workability of the die-cast products is/are deteriorated. Further, holes or grooves caused by said cutting are used for parts of configuration of products. This method is adapted for the mass production of products such as housings of compressors, pumps and the like, which is to be used under high-pressure conditions or to be subjected to precision working.
(FR)Procede de coulee sous pression dans lequel un metal fondu est injecte dans une cavite de coulee (30) par un orifice de coulee (31) et egalement par application d"une pression au moyen d"un piston de pression (36) au travers d"un canal de pression (17) communiquant avec la cavite de coulee (30) a un emplacement autre que celui de l"orifice de coulee. Selon l"invention, lors de l"application de la pression, le metal fondu dans le canal de pression (17) peut etre extrude dans la cavite de coulee afin de former un flux dilate afin que l"application de la pression s"effectue sous une pression stable. Une parie du produit coule est solidifie dans la cavite de coulee (30), laquelle parie est substantiellement opposee au canal de pression (17), est coupee selon la direction du mouvement du piston (36) a travers une section plus grande que celle du canal de pression (17) afin d"eliminer une parie ou les defauts de surface et/ou de segregation sont susceptibles de se former et d"affecter la resistance et/ou l"usinage des produits coules sous pression. Ce procede se prete a la production en serie de produits tels que des batis de compresseurs, pompes ou leurs analogues, qui peuvent etre utilisees dans des conditions de haute pression ou etre soumis a un travail de precision.
Designated States:
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)