Dynamic characteristic analysis of machine tool bed considering contact stiffness of joint surface

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (8) : 310-318.

LIU Shusheng1, SHI Jun2, SUN Jianhong2, QIN Wenqiang3, ZENG Yanhong3, ZHANG Song1

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Abstract

The stiffness of the joint surface is an important factor that affects the dynamic characteristics and machining accuracy of a machine tool. To accurately determine the dynamic parameters of the machine tool, a prediction model is used to obtain the contact stiffness of the bed joint surface, and an equivalent dynamic model is established. Firstly, the contact stiffness prediction model is developed. Secondly, the prediction model is used to identify the contact stiffness of the joint surface between two materials (cast iron and mineral composite). Thirdly, using the contact characteristic parameters of the joint surface, a finite element model based on spring element constraint is created. Finally, comparing the finite element modal frequency with the experimental modal frequency reveals that the finite element modal frequency, based on the spring element constraint, aligns well with the experimental modal frequency. This indicates that the model is effective for both cast iron and mineral composites. The results demonstrate that incorporating the contact stiffness of the joint surface in the finite element model of the machine tool bed leads to a more reasonable representation. This provides a theoretical foundation for analyzing the dynamic characteristics of the machine tool and optimizing its structure.

Key words

joint surface / contact stiffness / dynamic characteristics / modal test

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LIU Shusheng1, SHI Jun2, SUN Jianhong2, QIN Wenqiang3, ZENG Yanhong3, ZHANG Song1. Dynamic characteristic analysis of machine tool bed considering contact stiffness of joint surface[J]. Journal of Vibration and Shock, 2024, 43(8): 310-318

References

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