| 摘要 |
PURPOSE:To improve dimensional accuracy and to eliminate the need for sand treatment by pouring a molten metal into a rotary casting mold whose core is formed of a combustible material thereby burning the core. CONSTITUTION:The core 3 formed of the combustible material such as paper or plastic is attached to the rotary casting mold 2. The mold 2 is heated and held to and at a prescribed temp. and while the mold is kept rotated, the molten metal is poured therein and is centrifugally cast. The molten metal is packed from the outside during casting and finally the molten metal contacts with the core 3 and the cores 3 burns. The dimensional accuracy is thus improved and the surface is smoothed. Since no sand is used for the core, the need for the sand treatment is eliminated. |
