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火力发电和原子能发电机组功率的不断提高,要求转子锻件随之大型化和高质量。大功率汽轮机的低压转子过去是采用叶轮烘套在主轴上的方法制造的,但是,国外汽轮机事故分析表明,为提高可靠性,转子应向整锻方向发展。因此,需要更大的钢锭。钢锭的大型化必然导致钢锭内部偏析的加剧。转子直径变粗,使炼钢、锻造和热处理的每道工序都增加了难度,更难以保证锻件内部的质量。因此,欲制成高质量的转子,要求每道工序均采用先进的制造工艺。
Thermal power and atomic power units continue to increase the power requirements of the rotor forging large and high quality. In the past, low-pressure rotors of high-power steam turbines were produced by the method of using impeller bosses on the main shaft. However, the analysis of foreign turbine accidents shows that the rotors should be forged to improve the reliability. Therefore, larger ingots are needed. Large-scale ingot will inevitably lead to aggravating segregation within the ingot. Rough rotor diameters make it harder for every step of steelmaking, forging and heat treatment, making it more difficult to guarantee the quality inside the forgings. Therefore, to make a high quality rotor, each process requires the use of advanced manufacturing processes.