| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing a casting product having a small hole at a low cost, with a high productivity and in a short time by reducing troubles that may be caused in the difficulty of a draw of a linear core material after casting or caused in its durability. SOLUTION: A casting product 4 having a small hole 5 with a wire cross section shape is manufactured by using a surface coated or surface treated wire as the due wire when molten metal is casted into a cavity 2 of a mold 1 to which a wire 3 (linear core material) with a desired cross section shape is preset, and by enabling only the wire to be drawn as its membrane formed by surface coating or surface treatment is partially or totally exfoliated by the draw. When the wire is drawn out of a casting material after casting, the wire can be drawn as well, by employing a material of high elastic limit to the wire, out of the inside of the casting material as a diameter of the wire becomes small by its elastic deformation in the direction of the draw.
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