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Quenching Technology of Crane Wheel Forgings
- Dec 24, 2018 -

The length of quenching time is one of the important factors affecting the mechanical properties and dynamic load strength of crane wheel forgings. In order to make the wheels have high mechanical properties, the quenching depth must be very large. At the same time, considering that there is a large amount of heat accumulated in the wheel for self-tempering, the quenching process must be stipulated according to the necessary conditions: a deep quenching layer; resulting in good self-tempering conditions.

The quenching process of crane wheel forgings is very important. Wheel quenching can be either integral quenching or rim surface quenching. The latter is widely used. When rolling waste heat quenching is used, it is generally only surface quenching. When the rim surface quenching is carried out by single heating, fine grain structure is obtained as a result of recrystallization, which is helpful to improve the mechanical properties of the spoke plate and rim.


Typical heat treatment methods are: heat treatment alone - tread quenching with water - self tempering in pits. Among them, quenching mainly sprays water to quench wheel tread and outer rim surface to improve rim hardness and reduce hardness difference, thus improving spoke performance. After tempering, the semi-finished wheels are made.

When quenching with residual heat of rolling, crane wheels quench for a longer time and lose more heat accumulated in the wheels, thus reducing the self-tempering temperature. Shortening the quenching time will increase the self-tempering temperature, but there will be the danger of insufficient strength limit. Therefore, the selection of heat treatment system becomes very complicated in the whole wheel production process because of the interrelationship between the various processes of heat treatment when heat treatment is carried out with rolling waste heat. When the wheels are quenched by separate heating, it is easy to control the temperature of the wheels. When the wheels are tempered again, the self-tempering process to ensure the mechanical stability of the wheels is also easy to determine.