| 摘要 |
PURPOSE:To reduce the cost of production by providing sand molds to the inside surfaces of a split metallic mold then pouring a molten metal into the sand molds and rotating the metallic mold. CONSTITUTION:The metallic mold is constituted of an upper mold 10a and lower mold 10b which can be split and a cavity 12 is formed when these molds are closed. The sand molds 14 which control the outside shape of the product are disposed on the inside wall surface of the cavity 12 and the molds 10a, 10b are closed, then the molten metal is poured into the cavity and the mold 10 is rotated by which the molten metal is centrifugally cast. The products of various outside shapes and sizes can be obtd. simply by preparing one split metallic mold 10 of the capacity enough to cover the various outside shapes and sizes thereof and forming the sand molds 14 corresponding to the various sizes. The cost of manufacturing the costly metallic mold is thus reduced and therefore the production cost of the product is considerably reduced.
|
