The text analyses some key problems of accurately machining of O circle mouldcavity, including its technology, measurement, and machining error, and then puts forward a CAD example for it.
This paper discusses various factors which affect the dimensional torlerence of products of precise mould and offers a multi-object optimal method for designing cavity dimensions of precise mould.
综合考虑了影响精密型腔模具成型产品零件尺寸公差的各种因素，提出了模具成型尺寸的多目标优化方法。
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Gas hole and inclusion can be reduced by properly increasing thickness, and quality of the chilling layer, uniformly spraying and cleaning the mouldcavity on time.