The length of quenching is one of the important factors affecting the mechanical properties and dynamic load strength of forged wheels. In order to achieve surface hardening of the wheel with high mechanical properties, the quenching depth must be large. At the same time, considering that a large amount of heat can be accumulated in the forged wheel for later self-tempering, in the general heating and quenching, the quenching process must be specified according to the necessary conditions: having a deep quenching layer; resulting in good self-tempering conditions.
Forging wheel quenching process is very important, forging wheel quenching can be integral quenching, or rim surface quenching, the latter is widely used; when quenching residual heat quenching, it is generally only surface quenching; when heating is used for rim surface quenching, due to The result of recrystallization gives a fine grain structure and thus contributes to an improvement in the mechanical properties of the web and the rim.
A typical heat treatment method is: separate heat treatment - the tread is quenched with water - self-tempering in the pit. The quenching is mainly to spray the water on the forged wheel tread and the outer surface to improve the hardness of the rim and reduce the hardness difference, thereby improving the performance of the web. After tempering, the semi-finished products of the wheel were made.
When quenching with rolling residual heat, the forging wheel is quenched for a longer period of time, and the heat accumulated in the wheel is lost more, thereby lowering the self-tempering temperature. Shortening the quenching time will increase the self-tempering temperature, but there is a danger of insufficient strength limits. Therefore, when the heat treatment is performed by rolling residual heat, the relationship between the respective processes of the heat treatment makes the selection of the heat treatment system very complicated in the entire forged wheel production process. When the forged wheel is quenched by heating alone, the control of the forged wheel temperature is relatively easy to realize, and then the self-tempering process for ensuring the mechanical performance of the forged wheel is easy to determine when self-tempering.