Surface hardening technology of construction machinery forging die is a key research content, aiming at improving the service life and wear resistance of the die. The following are some commonly used mold surface hardening techniques:
- Flame quenching: Heat the mold to a critical temperature and then cool it quickly. This method can make the mold surface form a hard martensitic structure, enhance its hardness and wear resistance.
- Nitriding treatment: The mold is immersed in a high-temperature atmosphere containing ammonia gas to form a nitride layer on the surface of the mold. The nitriding layer has high hardness, good wear resistance and corrosion resistance.
- Carburizing treatment: Soak the mold in a medium containing carbon and heat it at high temperature. Carbon atoms will penetrate the surface of the mold to form a high carbonization layer, improving hardness and wear resistance.
- Electrodialysis: Using the principle of electrolysis, metal ions are deposited on the surface of the mold by current to form a hard coating. This method can improve the finish and wear resistance of the die surface.
- Tungsten gun thermal spraying: Use tungsten gun to spray molten tungsten powder on the surface of the mold to form a hard coating. Tungsten has a high melting point and high hardness, which can improve the wear resistance and corrosion resistance of the mold.
When selecting the appropriate surface hardening technology, factors such as mold material, process requirements, depth and uniformity of the hardening layer need to be considered. At the same time, reasonable preheating and subsequent treatment process is also the key to ensure the mold hardening effect. Finally, after the appropriate surface hardening treatment, the construction machinery forging die can improve the service life, reduce the maintenance and replacement frequency, thereby reducing production costs and improving production efficiency.
