| 摘要 |
PURPOSE:To prevent the deformation of core caused by molten metal pressure and to obtain product having excellent quality by araising the molten metal pressure to the specific pressure after forming the initial solidified layer having the prescribed thickness on the surface of core. CONSTITUTION:The disintegratable cores 3, 4 are set at the prescribed state in a cavity (a) formed at the parting part of upper die 1 and lower die 2 and the plunger tip 6 in an injection sleeve 5 is shifted toward (c) direction, to fill up the molten metal (b) in the sleeve 5 into the cavity (a). Next, in case of pressurizing the molten metal by the plunger tip 6, the pressure applied to the molten metal (b) is held to <=100kg/cm<2>, to form the initial solidified layer (d) having the prescribed thickness on the surfaces of cores 3, 4. And, at the time of forming the solidified layer (d), the pressurized force by the tip 6 to the molten metal (b) is increased to raise at >=100kg/cm<2> and the molten metal (b) is solidified by holding the pressurized condition till the prescribed time.
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