大型复杂结构铸件表面气孔缺陷解决对策  

Solution of Blowhole Defects on the Large Complex Casting Surface

作　　者：王洁英 张聚辉 鲁栋 汪继革 刘磊 WANG Jie-ying;ZHANG Ju-hui;LU Dong;WANG Ji-ge;LIU Lei(Weichai Heawy Machinery Co.,Ltd.,Weifang Shandong 261108,China)

机构地区：[1]潍柴重机股份有限公司,山东潍坊261108

出　　处：《铸造设备与工艺》2024年第1期12-14,共3页Foundry Equipment & Technology

摘　　要：以一种大型机体气孔缺陷为例,总结了复杂结构机体上表面气孔缺陷的解决方法。通过铸造仿真模拟分析了气孔缺陷形成机理,主要原因为:(1)铁水到达上表面时温度降低至1210℃附近,不利于侵入性气体上浮排出;(2)机体上表面缺少纵向排气通道、气眼和溢流冒口;(3)凸轮轴上部为拱形薄壁结构,浇注后期铁水粘稠,气体流动不畅无法顺利排出。通过改进机体上表面结构、提高排气能力等方案,解决了铸件表面气孔缺陷。Taking a large body as an example,the solution to the porosity defect on the upper surface of complex body is summarized.The formation mechanism of pore defects was analyzed by casting virtual simulation.The main reasons are as follows.When hot metal reaches the upper surface,the temperature drops to about 1210 C,which is not conducive to the floating and discharge of intrusive gas.The upper surface of the body lacks longitudinal exhaust channels,gas holes and overflow risers.The upper part of the camshaft is an arched thin-wall structure,and the hot metal is thick and the gas flow is not smooth and can not be discharged smoothly.By improving the structure of the upper surface and increasing the exhaust capacity,the surface porosity defects of the casting can be solved.

关 键 词：气孔缺陷 机体 浇注系统 

分 类 号：TG245[金属学及工艺—铸造]