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Forging forming is produced under the action of external force. Therefore, correct calculation of deformation force is the basis for selecting equipment and checking mold. Analysis of stress and strain inside the deformed body is also indispensable for optimizing the process and controlling the structure and performance of the wheel forgings.

There are four main methods for analyzing deformation force: principal stress method, slip line method, upper limit method and finite element method.

Finite element method: The finite element method can not only give the external load and the changes in the shape of the workpiece, but also the internal stress and strain distribution. The disadvantage is that there are more computer time, especially when solving by elastoplastic finite element. Larger capacity and longer machine time. Recently, there is a trend to use a joint approach to analyze problems, for example. The upper limit method is used for rough calculation, and the finite element is used for detailed calculation in key parts.

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