Abstract
The non-uniform load distribution of crowned roller along the contact line has a significant impact on the dynamic characteristics and fatigue life of the roller linear guideway workbench (RLGW). Moreover, the randomness in the design parameters due to unavoidable manufacturing errors will induce the uncertainty in the vibration prediction of RLGW, which will affect the machining accuracy of machine tool. To this end, this paper first establishes a novel five-DOF dynamic model considering the non-uniform load distribution of crowned roller to investigate the vibration characteristics of RLGW. The coordinate transformation method is used to obtain the vibrations at the four raceways of carriage by applying the workbench vibrations. The Hertz contact theory and the slicing method are applied to calculate the contact force and moment of crowned roller including the influence of roller profile, and a time-varying five-DOF restoring force model dependent on the workbench vibrations is established. Then, to improve the computing efficiency, a vibration reliability evaluation method of RLGW based on the active learning Kriging model and Monte Carlo Simulation (ALK-MCS) method is proposed. The developed dynamics modeling method is verified by some experiments on a CNC milling machine workbench system. The changes in the vibration characteristics and stiffness of RLGW are studied by varying the preload degree and number of loaded rollers. Furthermore, the vibration reliability and reliability sensitivity of RLGW are studied to provide theoretical foundation for the parameter optimization.
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This work is supported by the National Natural Science Foundation of China (52075087), and the Fundamental Research Funds for the Central Universities (N2003006 and N2203002).
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Miao, H., Wang, C., Li, C. et al. Vibration characteristics and reliability analysis of roller linear guideway workbench. Nonlinear Dyn 111, 21461–21485 (2023). https://doi.org/10.1007/s11071-023-08924-7
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DOI: https://doi.org/10.1007/s11071-023-08924-7