| 摘要 |
PROBLEM TO BE SOLVED: To easily reduce development of strain by giving the almost same heat treatment state to a plurality of wheels for vehicle even in the case of using multi-steps of loading trays. SOLUTION: In the method for heat treatment of the wheel for vehicle applying the heat treatment to the wheel for vehicle together with the loading tray by loading a plurality of steps of wheels for vehicle onto the loading tray loadable to the materials to be heat-treated at a plurality of steps in the upper and the lower parts, particularly, the loading position at each step of he wheel for vehicle, is loaded so as to become the different position in the vertical direction to the loading position of the wheels for vehicle at the adjacent steps in the upper and the lower parts to apply the heat treatment.
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