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去年夏季,我厂接受了美国西屋公司委托加工汽轮机低压外缸的任务。该汽缸的加工具有相当的难度。首先,加工周期很短,总共只有二个半月的时间。对于首次加工的新产品按我厂以往惯例计算,这个汽缸的加工至少要用四个月的时间,这还不包括编制数控加工程序的周期;其次,该汽缸体积之庞大为我厂机加工史上所少见。该汽缸分为四块,每块长约9米,宽约6米,高约3.5米,合缸高度达7米之多,因而对加工带来很大的困难;再次,该汽缸的加工有相当的精度要求,特别有三只需要镗准的球面轴承
Last summer, our factory accepted the task entrusted by the Westinghouse Company to process the low-pressure outer cylinder of the steam turbine. The cylinder machining is quite difficult. First, the processing cycle is short, a total of only two and a half months. For the first time processing of new products according to our factory’s past practice, the cylinder processing at least four months, which does not include the preparation of CNC machining cycle; Second, the huge cylinder size for the machining of our plant in the history Rare. The cylinder is divided into four, each about 9 meters long, about 6 meters wide, about 3.5 meters high, the cylinder height of up to 7 meters, which caused great difficulties in processing; Third, the cylinder processing Very accurate requirements, in particular, there are three need to boring the standard spherical bearings