| 摘要 |
A core assembly for use in the casting of molten metal is formed by fabricating a first core, molding a plastic layer around the first core, and molding a second core around the plastic layer. The plastic layer is interlocked with an irregular outer surface of the first core, and the second core is interlocked with an irregular outer surface of the plastic layer. The plastic layer is then dissolved with a suitable solvent prior to placing the core assembly into a mold and molten iron being poured. |
