By optimizing composition, foundry method, melting process and heat treatment process, the rate of qualified castings was increased up to 85%.

通过对成分、铸造工艺、熔炼工艺及热处理工艺的优化，使铸件的工艺出品率达到85%。

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Foundry method, melting process, heat treatment process for nodular iron crankshaft was introduced and the measures to prevent common defects were described.

介绍了球墨铸铁曲轴的铸造方法、熔炼工艺和热处理工艺，同时描述了预防一般缺陷的措施。

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The result shows that the strength, especially elongation, of adjusted pressure casting sample is increased dramatically under the same conditions of melting and heat treatment.

结果表明，在相同的熔铸工艺和热处理条件下，调压铸造试样的强度，特别是延伸率得到大幅度提高。

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