发热保温冒口在铁路机车轴箱体上的应用

摘要

The technical requirements of the steel casting of the locomotive axle housing were introduced.Cold risers had been used in the original casting method and as the result,the X-ray detection showed that about 6％ castings having shrinkage defects higher than Ⅲ grade.After changing the cold risers into the exothermic-insulating risers,the x-ray detection result of 3 600 pcs of castings showed that the castings having shrinkage defects higher than Ⅲ grade has been reduced to 1.5％.Production result showed that using exothermic risers increased the feeding effect of risers,effectively eliminated shrinkage defects of castings,as well as reduced productive cost and increased economic efficiency.%介绍了铁路机车轴箱体铸钢件的技术要求.原工艺采用冷冒口,X射线探伤后,约6％的铸件有超过Ⅲ级的缩孔或缩松缺陷.改用发热保温冒口工艺后,生产的3 600件铸件经X射线探伤后,超过Ⅲ级的缩松、缩孔缺陷降至1.5％.生产结果表明:采用发热保温冒口,提高了冒口的补缩效率,有效地消除了铸件缩孔、缩松缺陷,并且降低了生产成本,提高了经济效益.