改进薄壁罩体铸铝件铸造工艺的实践

针对薄壁罩体铸铝件在铸件内腔、法兰端面产生大面积夹渣、局部气孔及偏箱等缺陷,铸件成品率不到45％,进行了工艺改进,即由法兰朝上改为法兰朝下,由顶注改为底注,并使用明顶切割冒口、暗冒口、变壁冷铁及工艺补贴,有效地解决了铸件大面积夹渣、局部气孔及偏箱等质量问题,生产出的铸件能够满足使用性能要求,成晶率提高到100％.

Practice of Improving Casting Process for Thin Cover Aluminum Castings

Aimed at the cast defects of large area slag,local porosity and partial boxes in thin-wall cover castings of aluminum at the cavity of castings and the end faces of flanges,the finished product rate is less than 45%,the process was improved,that was,flange facing downward,bottom injection,and using top cutting riser,dark riser,variable wall cold iron and process allowance matching.Practice showes that these measures can effectively eliminate the cast defects,produced castings can meet the performance requirements,the rate of finished products improves to 100%.