Heat treatment process for 200MW or lower large size rotor

Abstract

The invention provides a process for the heat treatment of a 200 MW or below large-scale rotor, which adopts a cooling mode of water quenching and oil cooling, controls quenching temperature and tempering temperature and strictly controls the oil entry temperature of effluent. A, a rotor is suspended in a furnace, and the temperature is raised to be 350 DEG C and kept constant for 4 hours and then raised to be 650 DEG C and kept constant for 6 hours; B, heat-preservation quenching is performed according to 1h / 100mm, during quenching, and the rotor is first cooled in water according to 8 to 12 min / 100mm, then enters oil to be cooled according to 15 to 18 min / 100mm and finally is taken out from oil; C, after quenching, the rotor is cooled to be below 200 DEG C, and placed back into the furnace for tempering; and D, during tempering cooling, cooling speed is controlled to be less than or equal to 25 DEG C / h, and the highest temperature of the hearth is reduced to be less than or equal to 150 DEG C. The large-scale rotor processed by the process has extremely high strength and excellent plasticity, toughness, and high thermal resistance. The process solves the problem of low rotor performance, avoids cracking risks and guarantees the performance, strength index and impact resistance value of the rotor.

Description

technical field [0001] The invention relates to the technical field of motor rotor manufacturing, and relates to a heat treatment process for producing 200MW and below large rotors. Background technique [0002] At present, the motor rotor is one of the four key components of thermal power generation equipment. Due to its complex working conditions, it bears huge centrifugal force, thermal stress caused by temperature gradient, and high-frequency additional stress caused by rotational vibration. The unit starts, stops and Instantaneous impact vibration and torsional stress produced by other reasons; especially for large rotors below 200MW, they bear even greater torsional stress during work, and their heat treatment process belongs to the field of engineering technology. The production of this rotor has relatively high technical difficulties: the weight of the workpiece is heavy, the cross-sectional size is large, oil cooling is prone to low performance, pure water cooling i...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the technical problem that the 200MW large-scale rotor has a large cross-section and many steps, which easily cause large differences in the hardness of each step, the present invention provides a heat treatment process for large-scale rotors of 200MW and below

Solve the problem of low performance of large rotors, and avoid the risk of cracking, so that the strength index and impact value of the rotor can be guaranteed

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