北京机器厂模铸车间在五二年八月就开始制造高级铸铁铸件,这种铸件无论对技术人员和工人来说,都是一项新的工作,因此也就谈不上铸造工作的实际经验了。在过去七、八个月的铸造工作中,总是找不出一套比较纯熟的经验,铸件因不合要求经加工发现针孔而报废的就占总报废率的 40%以上。今年有一炉所浇铸的铸件,因 Beijing Machine Factory molding shop in August 52 began manufacturing high-grade cast iron castings, both for technicians and workers, casting is a new job, so they can not talk about the actual experience of casting work It’s Casting in the past seven or eight months, always can not find a more experienced, castings due to unplanned processing found that pinhole and scrapped the total scrap rate of more than 40%. This year there is a cast casting furnace, because