US 12,378,620 B2
Quenching method
Koji Obayashi, Kariya (JP); Daisuke Kasai, Kariya (JP); Keisuke Matsuzaka, Kariya (JP); Takeshi Naito, Yokohama (JP); Takeshi Ryujin, Anjo (JP); and Toshiaki Matsumura, Anjo (JP)
Assigned to AISIN CORPORATION, Aichi (JP)
Appl. No. 17/420,581
Filed by AISIN CORPORATION, Aichi (JP)
PCT Filed Mar. 16, 2020, PCT No. PCT/JP2020/011471
§ 371(c)(1), (2) Date Jul. 2, 2021,
PCT Pub. No. WO2020/203226, PCT Pub. Date Aug. 10, 2020.
Claims priority of application No. 2019-066074 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0106653 A1, Apr. 7, 2022
Int. Cl. C21D 1/18 (2006.01); C21D 1/58 (2006.01); C21D 1/60 (2006.01); C21D 1/64 (2006.01)
CPC C21D 1/18 (2013.01) [C21D 1/58 (2013.01); C21D 1/60 (2013.01); C21D 1/64 (2013.01); C21D 2211/008 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A quenching method in which an object to be treated that is a quenching target is cooled with a quenching coolant that is a coolant for quenching, wherein
the object to be treated is moved inside the quenching coolant accumulated in a cooling tank, by a moving device for moving the object to be treated, and
at least from when the object to be treated comes into contact with the quenching coolant until a surface of the object to be treated undergoes martensitic transformation, a speed of the moving device is controlled to synchronize with a predetermined flow speed of the quench coolant.