从1958年新造车辆开始广泛采用球墨铸铁轴瓦(以下简称球铁瓦)以来,已经七年多了,现在所有货车和大部分客车以及机车方面都使用了球铁瓦。随着这项重大技术革新的实现,毫无疑问,铁路的用铜量大大减少,这就为我国铁路大力发展机车车辆制造事业,提供了物资基础,相应地给降低成本 It has been more than seven years since the extensive use of ductile iron bushings in new vehicles in 1958 (now ductile iron bushings) and is now used in all trucks and most passenger trains and locomotives. With the accomplishment of this major technological innovation, there is no doubt that the amount of copper used in the railway has been greatly reduced, which has provided a material basis for the development of the rolling stock manufacturing industry in our country. In turn,