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介绍了福建省三明钢铁厂炼钢３＃、４＃小方坯连铸机５００ｔ机械飞剪同步装置改造前存在的问题、改造设计过程和改造后的使用效果。
The problems existing before the 500t mechanical flying shear synchronization device of 3 # and 4 # billet continuous casting machines in the steel making factory of Sanming Iron & Steel Co., Ltd. in Fujian Province were introduced, and the design process and the using effect after renovation were introduced.