| 摘要 |
PROBLEM TO BE SOLVED: To obtain a die cast product developing less blow holes and having good quality by drastically restraining the entrapment of gas in a cavity. SOLUTION: Electromagnets 11, 12 are embedded into a fixed die 3 and a movable die 4 constituting a die 1 by using fitting plates 13 composed of material having low permeability, and current is made to flow in coils 11b, 12b of these electromagnets 11, 12 so that different magnetic poles are mutually faced and magnetostatic field M is formed toward the orthogonal direction to the injection direction into a cavity 5 near a gate part 10. When molten metal 6 injected into the cavity 5 from the gate part 10 passes through in the magnetostatic field M, eddy current is generated in the molten metal 6 with electromagnetic induction, and the molten metal stream is decayed with the repulsion of the eddy current and the magnetostatic field M and as a result, the entrapment of the gas into the cavity 5 is restrained. COPYRIGHT: (C)2005,JPO&NCIPI
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