船舶艉轴承的铸造工艺优化

Casting Process Optimization of Ship Stern Bearing

船舶用艉轴承,材质为HT300,要求不允许有任何铸造缺陷,但在生产过程中,艉轴承因缩陷、粘砂造成的废品率高达50%,无法保证产品质量。通过对缺陷进行分析,对工艺进行改进,控制铁液的充型温度场,使温度场均匀,最终解决了铸件的粘砂缺陷,废品率降低至5%。

Stern bearings for ships,made of HT300,are simple in structure,but do not allow any casting defects.However,the rejection rate of stern bearing castings due to shrinkage and burning-on is as high as 50%,which seriously affects the production of products and cannot guarantee the quality.By analyzing the causes of defects,the casting process of the stern bearing was improved,and the filling temperature of molten iron was controlled so that the temperature field of the stern bearings became uniform.Thus the defects of the castings was eliminated or reduced.Finally,the rejection rate was reduced to 5%.