The forging factory adopts an unconventional heat treatment process, which overcomes the asynchrony of the internal and external structural transformation of the forging, reduces the thermal stress and the structural stress, so the effect is more obvious. During the heat treatment process of the forging, the following methods play an important role and save a lot of money It is worth advocating and promoting.
1. Surface quenching (induction heating, flame heating, electrolytic heating quenching, etc.). For example, slender parts such as screws, lead screws, and spindles are surface quenched to ensure sufficient hardness, high wear resistance and fatigue strength on the surface, and good internal strength and toughness. The overall deformation of the parts is small.
2. Deformation heat treatment of forgings.
3. Controlled atmosphere and vacuum heat treatment.
4. Chemical heat treatment in forging factory. Nitriding and soft nitriding of forgings will result in differences in the chemical composition of the internal and external structures, and at the same time, the temperature will be below the transformation point, thus avoiding the possibility of a significant increase in deformation after overall quenching, and is suitable for forgings with strict deformation requirements.
5. Ultrasonic quenching. The use of ultrasonic energy to make the quenching medium vibrate can eliminate the vapor film on the surface of the quenched forgings, increase the cooling rate, increase the intensity of the quenching process, and make the cooling more uniform, which can avoid the generation of soft spots and soft bands on the surface of the forgings. significantly reduced.
6. Rapid heating. It refers to the heat treatment process of increasing the heating temperature to make the surface of the forging rapidly reach the quenching temperature, and then completing the quenching heat treatment process, for example, the gears are rotated in a salt bath furnace to heat the teeth or perform high-frequency heating. The intenite grains did not grow, and the heat on the surface could not be transferred to the interior after quenching, so only the surface was transformed, and the deformation was significantly reduced.
