采用铜合金金属型生产小型薄壁球墨铸铁件是铸造领域一项新技术。
Using copper alloy mould to make the small-sized and thin wall ductile iron castings is a new technology in the foundry field.
结果表明：经金属型铸造的铜合金密度达到理论密度的99 91%。
The results show that the copper alloy density by permanent-mold casting attains 99.91% of theory density.
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