This paper has analyzed the causes of foundry defects and proposed the ways to prevent foundry defects so as to improve the quality of castings.

就铸造缺陷的成因及如何采取措施防止铸造缺陷的产生，提高铸件质量作简单的分析。

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Comprehend foundry technics, familiar with the casting defects in the form of easy to produce.

对铸造工艺有一定了解，熟悉铸件易产生的缺陷形式。

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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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