| 摘要 |
PURPOSE:To obtain a titled cylinder without damaging a sleeve by setting a preheated ceramic sleeve having specific porosity into the cavity of dies, packing a molten Al alloy under the specific pressure therein and embedding the outside circumference of the sleeve in said alloy by casting. CONSTITUTION:A cavity 8 is formed of a movable upper die 7, an intermediate die 5, a stationary lower die 2 and a core 3 having a bored pin 4 for holding a sleeve. A ceramic sleeve 10 having 70-90% porosity is preheated to about 300- 400 deg.C and is fitted into the holder 4 in the die cavity 8. The melt of an Al alloy is pressurized under <=300kg/cm<2> casting pressure and is packed into the cavity 8 to embed the outside surface of the sleeve 10 by casting while the molten alloy is penetrated into the pores of the sleeve 10. The denseness, bindability and unity of the sleeve 10 and the molten Al are thus improved. |
