ROTOR MANUFACTURING METHOD

To achieve both cold formability and higher hardness of a rotor shaft.SOLUTION: A rotor comprises a tubelike rotor shaft and a cylindrical rotor core fixed to a rotor core mounting surface formed in an outer periphery of the rotor shaft. The rotor shaft uses a metal whose carbon content is less than...

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Bibliographic Details
Main Authors IENAGA KEIGO, ISHIKAWA MASAHIRO, ADACHI TAKEHIKO, KOORI TOMOKI, OKADA KAZUAKI
Format Patent
LanguageEnglish
Japanese
Published 03.06.2021
Subjects
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
DYNAMO-ELECTRIC MACHINES
ELECTRICITY
GENERATION
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Summary:To achieve both cold formability and higher hardness of a rotor shaft.SOLUTION: A rotor comprises a tubelike rotor shaft and a cylindrical rotor core fixed to a rotor core mounting surface formed in an outer periphery of the rotor shaft. The rotor shaft uses a metal whose carbon content is less than 0.3% as a base material. A rotor manufacturing method comprises a surface reforming step (step S3) and a cold working step (step S5). The surface reforming step reforms a surface of the rotor shaft by allowing an entry of a solute atom from a surface of the rotor shaft. The cold working step forms a spline, which is an engaging part having an uneven shape protruding or recessed in a radial direction, by plastically deforming the rotor shaft after performing the surface reforming step.SELECTED DRAWING: Figure 2 【課題】ロータシャフトの冷間成形性と高硬度化とを両立する。【解決手段】ロータは、管状のロータシャフトと、ロータシャフトの外周部に形成されたロータコア取付面に固定された筒状のロータコアと、を有する。ロータシャフトは、炭素含有量が０．３％未満の金属を母材とする。ロータの製造方法は、ロータシャフトの表面から溶質原子を侵入させて表面を改質させる表面改質工程（ステップＳ３）と、表面改質工程の実行後に、径方向に突出あるいは窪んでいる凹凸形状を有する係合部であるスプラインを、ロータシャフトを塑性変形させて形成する冷間加工工程（ステップＳ５）と、を備える。【選択図】図２
Bibliography:Application Number: JP20190213729