The numerical model has been validated to confirm the reliability of the obtained results. Due to the cost of implementing new models, it is more economical to test potential configurations using numerical methods, such as the finite element method. Modern wheeled armoured vehicles can perform a variety of tasks, making the development of weapon systems that can be safely and effectively integrated with the vehicle structure an area of interest. As a result of observing the internal stress distribution of the ball screw estimated by the model, it was confirmed that the shape was similar to that of the actual stress distribution and, compared with the analysis results of other conventional methods conducted with the same mesh shape, the results of the model presented in this paper were more valid. Factors derived by theoretical calculation include the shape of the contact surface where the ball and other parts meet and the contact pressure at the contact surface, which were derived by a method based on Hertz contact theory. This model is a synthetic model that applies theoretical calculation results to a 3D FEA model. In this paper, a new FEA model that can efficiently estimate the stress caused by internal contact inside the ball screw is presented.
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Theoretical calculations or finite element analysis (FEA) are mainly used for the analysis of rotating parts, but existing methods have difficulty in observing stress changes occurring on the narrow contact surface of ball screws. As this permanent deformation mostly occurs on the contact surface between the ball and other parts, it is necessary to observe the change of internal stress caused by the contact of the parts in order to determine whether permanent deformation occurs. As ball screws are mostly used for precise driving, permanent deformation has a fatal effect on the operation of the system.
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A ball screw is a mechanical part that converts rotational motion into translational motion, but when it receives an excessive axial load, permanent deformation occurs inside.