| 摘要 |
A constant velocity join cage for automobile and a manufacturing method thereof are provided to obtain superior surface strength and wear resistance, and be excellent in toughness and durability. A manufacturing method of a constant velocity join cage for automobile comprises: a carburizing and slow cooling process including a charging step, a heating step of heating a workpiece of the constant velocity join cage for automobile to a temperature range of 900 to 930 deg.C at which the workpiece can be smoothly carburized, a heating holding step of holding the heating state of the workpiece for about 250 to 300 minutes to provide the workpiece with a sufficient carbon diffusion time, an air cooling step of air-cooling the workpiece to a temperature of 400 to 450 deg.C, and a temperature maintenance step of maintaining the air cooling temperature for about 30 minutes to prevent the deformation of the workpiece due to rapid cooling; and a heat treatment process including a reheating step of reheating the workpiece to a temperature of 850 to 870 deg.C that is right above the transformation temperature, a temperature maintenance step of maintaining the reheating temperature for about 90 minutes to lower transformation stress, and a salt bath and water cooling step of cooling the workpiece to a temperature of 230 to 250 deg.C for about 15 to 30 minutes to maintain improved strength and improve toughness of the workpiece at the same time. |
