| 摘要 |
A method and apparatus for use in centrifugal casting of metal articles forms a compacted lining of a particulate refractory material on an inner surface of the mold. An amount of a dry binderless particulate refractory material is dispensed on the inner surface of a rotating mold body to form a centrifugally densified layer. A plowing tool is brought into contact with a layer of refractory material while continuously rotating the mold body to plow and compact the layer of particles. The tool is oriented at an angle with respect to the direction of travel of the layer of particles to penetrate the layer and compact the particles toward the inner surface of the mold body. The combination of the centrifugal force and the mechanical compaction of the particles results in a dense, air impervious, compacted mold lining having interlocked particles and voids between the particles that are not interconnected with an adjacent void. In one embodiment, the mold is formed with at least one air inlet and at least one air outlet communicating with an inner surface of the mold. A porous lining is formed on the inner surface of the mold in communication with the air inlet and the air outlet. Rotation of the mold draws air through the inlet and the porous lining and out through the outlet to cool the lining during casting.
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