| 摘要 |
PURPOSE: A hydroforming method is provided to improve hydroformability by accurately controlling heating temperature and time and controlled cooling the heated part, thereby softening the hardened structure of a material to be formed when heating a work hardened part of the material under certain conditions. CONSTITUTION: The hydroforming method by heat treatment on a part to be worked comprises the steps of partially heat treating the part to be worked of a material that is preworked, prebended and preformed before hydroforming process; softening the material by relieve cooling, coercive blowing leaving alone and quenching the part to be worked of the material after the heat treatment; and hydroforming the softened material, wherein the heat treatment includes high frequency heat treatment, torch heat treatment, laser heat treatment, and near infrared ray irradiation heat treatment, the heat treatment is performed in the heating temperature range of 600 to 950 deg.C for 5 seconds to 10 minutes, and the quenching is selected from water quenching, water soluble quenching solution cooling and oil quenching. |
