我们在学习戚墅堰机车车辆厂石灰石砂造型经验的基础上,结合我厂具体生产条件,改革了一些操作方法,进行边试验边生产。试验的铸件从最小几公斤到最大件八十多吨(部分泥芯)。试验钢种有15、25、35、45、55、35SiMn、40Cr、 50SiMn、50SiMnMo等10种。共浇出铸件1500吨左右,初步取得了一些成绩。 Based on our experience in limestone sand modeling in Qishuyan Rolling Stock Works, we combined with the specific production conditions in our factory to reform some operating methods and carry out production while testing. The test castings from a few kilograms to a maximum of more than 80 tons (part of the mud core). Test steel with 15,25,35,45,55,35 SiMn, 40Cr, 50SiMn, 50SiMnMo and other 10 species. Casting a total of about 1,500 tons of castings, preliminary made some achievements.