Crack in neck of hollow shaft is a very serious malfunction, main cause of the crack include: foundry defect, centralized stress, quality problems of welding and heat treatment.
中空轴轴颈裂纹是水泥磨的严重故障。中空轴轴颈裂纹产生的原因主要有：铸造缺陷，应力集中，焊接和热处理质量问题等。
The main task of this paper is to develop prediction & analysis system of shrinkage cavity and porosity defect in a casting for foundry engineering application.
本论文以有限元分析软件为开发平台，运用设计参数化和功能模块化技术，初步开发了面向铸造工程应用的铸件缩孔缩松预测及缺陷分析系统。
It has been found out that the defect was caused by adopting the foundry method with a cold riser which actually acted as a cold metal bleeder.
业已查明，缺陷是由于采用冷冒口工艺所致，因为冷冒口实际上起排放冷铁液作用。
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