HOT FORGING METHOD AND HOT FORGING DEVICE

PROBLEM TO BE SOLVED: To provide a hot forging method and a hot forging device by which generation of an oxidized scale during forging can be suppressed.SOLUTION: A hot forging method comprises: a temperature rising process in which a temperature of billet is risen to a first prescribed temperature (1,200°C); a cooling process in which the billet, of which the temperature is risen to the first prescribed temperature, is cooled to a second prescribed temperature (900°C), which is equal to or higher than A3 transformation point, at a prescribed cooling rate; a descaling process in which an oxidized scale on a surface of the billet, which is cooled to the second prescribed temperature, is removed; and a forging process in which the billet which is cooled to the second prescribed temperature and from which the oxidized scale is removed, is forged.SELECTED DRAWING: Figure 2 【課題】 鍛造時の酸化スケールの発生を抑制できる熱間鍛造方法および熱間鍛造装置を提供する。【解決手段】 ビレットを第１所定温度(1,200℃)まで昇温する昇温工程と、第１所定温度まで昇温されたビレットを所定の冷却速度でA3変態点以上の第２所定温度(900℃)まで冷却する冷却工程と、第２所定温度まで冷却されたビレットの表面の酸化スケールを除去するデスケール工程と、第２所定温度まで冷却され、かつ、酸化スケールが除去されたビレットを鍛造する鍛造工程と、を備えた。【選択図】 図２