铁路机车用球墨铸铁轴箱铸造工艺设计

Casting Process Design of Spheroidal Graphite Cast Iron Axle Box for Railway Locomotive

在铁路机车用球铁轴箱的试生产过程中,铸造工艺采用封闭-开放式浇注系统,中间位置进行分型,在矩形凸台处布置1个内浇道。经X射线检测发现,铸件矩形凸台处存在缩松缺陷。为了消除此类缺陷,使用MAGMAsoft凝固模拟软件对初始工艺进行了分析,并对内浇道尺寸进行了改善。试制结果显示,内浇道模数与凸台比例为0.4时,会产生缩松;内浇口模数与凸台比例小于0.4时,缩松消除;经X射线检测,按此工艺生产的铸件组织致密,能满足技术质量要求。

In the trial production process of the axle box made of spheroidal graphite cast iron, the casting process adopted enclosed-open gating system, and the parting line was located in the middle of the casting, with an ingate at the rectangular bulge. It was found by X-Ray defection that there exist the defects at the rectangular bulge of the castings. In order to eliminate these defects, the casting process was analyzed and simulated using MAGMAsoft solidification simulation software. The results showed that when the ratio of the ingate module to the bulge was 0.4, the shrinkage occurred;when the ratio of the ingate module to the bulge was less than 0.4, the dispersed shrinkage was eliminated, and it was verified by X-Ray defection that the produced castings could meet the quality requirements.