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乌拉尔重型机器厂的9000吨水压机是专门用来锻造水轮发电机上反磁钢护环的。半热锻的工艺实质是,,,在550°～300℃温度下将护环架于心棒之上进行扩孔,这时像冷压一样,护环是处于冷状态下得到辗伸的。根据技术条件的要求,为使护环在整个长度上和各处壁厚上的机械性能分布一致,因此不论采用何种锻造工艺,在扩孔的过程中必须使护环的壁部保持均匀的压缩,使成品锻件得到最小的壁厚误差。与玲压工艺相比,半热锻是比较先进的锻造方法,因为后者比前者的生产率大约要高三倍多而且可
The 9,000-ton hydraulic press at the Ural Heavy Machine Works is designed to forge the anti-magnetic steel retaining ring on hydro-generators. Semi-hot forging process is the essence of ,,, at a temperature of 550 ° ~ 300 ° C under the ring retaining ring on the mandrel reaming, then, like cold pressure, retaining ring is in a cold state to get stretched. In accordance with the requirements of the technical conditions, in order to make the grommet consistent with the distribution of the mechanical properties over the entire length and the wall thickness at all places, the wall of the grommet must be made uniform during the reaming process regardless of the forging process Compression, the finished product forgings get the smallest wall thickness error. Semi-hot forging is a more advanced forging method than the Ling pressure process because the latter is more than three times more productive than the former