轴承盖缩孔缺陷的防止措施

Measures to Prevent Shrinkage Cavity Defect of Bearing Cover

介绍了轴承盖铸件的结构及技术要求,详细阐述了该件的生产工艺及铸件冒口颈位置出现的缩孔、缩松问题,经过分析,采取了以下改进措施:(1)#5和#6铸件的独立冒口尺寸根部直径由55 mm增大至65 mm;(2)冒口颈参照共用冒口,尺寸改至40 mm×9 mm;(3)补缩距离适当缩短,冒口与热节的距离由53.4 mm改为43.4 mm。生产结果显示:解剖铸件后,铸件内部没有缩孔、缩松缺陷,冒口颈也没有缩孔,冒口补缩效果很好,沿着中心线向铸件进行补缩,最后冒口残留的铁液液位高于分型面20 mm,为铸件最后凝固阶段的补缩提供一部分压力。

The configuration and technical requirenmnts of the bearing cover was introduced. The casting production method and process, as well as the shrinkage porosities and cavities problems in the riser neck location were described in detail. The following improving measures were adopted after analysis ： （ 1 ）The root diameter of the independent risers of #5 casting and #6 casting was enlarged from 55 rant to 65 rant. （2）The riser neck diameter was changed refetTing to the cmnmon riser to 40 min×9 mm. （3）The feeding distance was properly shorlened,the distance fl＇om riser to hot spot was changed from 53.4 mm to 43.4 ram. The production result showed,no shrinkage cavity and porosity defects found inside casting,also no shrinkage cavity found in riser neck. The feeding eftect of the riser was very good：the riser fed the casting along the central line,the residual iron melt level was higher than mold parting face by 20 mm that provided a portion pressure for the last solidification stage of the casting.