| 摘要 |
PURPOSE:To obtain a Siamese type cylinder block stock having good casting quality by pouring a molten metal into cavities while applying a suction effect to areas for forming respective coupling parts of the cavities, then thoroughly solidifying the molten metal under a high pressure. CONSTITUTION:Fiber moldings F are mounted to cores 41 and sand cores 59 are fitted by core prints 31. Both side dies 101, 102 and upper and lower dies 9, 11 are then clamped. The cavity C1 consists of the respective cavities Ca, Cb for forming a cylinder barrel and forming an outside wall part. The cavity Ca consists of the area (b) for forming the bonding part between the moldings F and an area (c) for forming the cylinder barrel. The molten metal is poured from a sprue 17 into the cavities C2, C1 while the suction effect is applied to the area (b) through a suction hole 32 at the time of casting. The hole 32 is closed, upon completion of the packing of the molten metal, and the molten metal is thoroughly solidified under the high pressure by a plunger. The Siamese cylinder block stock having good casting quality is thereby obtd.
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