Abstract:In traditional studies of linear motion roller guide, the static stiffness is a main indicator to evaluate the mechanical behavior. However, the local contact profile between the roller and raceway surface, although very important to the precision maintenance, cannot be reflected in the measured value of static stiffness. In this article, a new indicator, named the real contact total length (RCTL), is proposed based on the Greenwood–Williamson model and the Hertz contact theory. In particular, an electric cont… Show more
“…In addition, the statistical parameters depend entirely on the sample length and instrument resolution. 12 Based on the GW model and the Hertz contact theory, Ke et al 15 proposed an electric contact model with the real contact total length (RCTL), aiming to evaluate the static stiffness of linear motion roller guide without preload. In Tomota et al, 16 using the GW model, an asperities distribution model considering skewness and kurtosis of non-Gaussian surface was proposed, which aimed to calculate the real contact area between smooth and rough surfaces.…”
High precision, efficiency and reliability are the unremitting pursuits of machinery manufacturing industry. As one of the pivotal function parts of high-end NC machine tool, precise linear guideway determines the machining precision and operation performance. Accurate evaluation and prediction of surface topography are the crucial effects on the matching performance of linear guideway. In this paper, the real contact area is regarded as a key parameter, a multi-scale method with the fractal theory is proposed. First, the contact area of a single asperity was obtained with Hertz contact theory. Afterwards, the contact area between rough surfaces was deduced by the fractal theory. Finally, using the proposed multi-scale contact mechanics model, the real contact area between rough plane and cylinder was obtained by integral solution. Compared with the former fractal model and GW model, the proposed model on the real contact area calculation of linear guideway is more accurate and comprehensive. The effect factors of load, fractal parameter and friction were discussed, the increasing rate of real contact area of smoother surface is greater as load increases. The proposed model may provide practical guidance for assembly accuracy and surface quality requirements at design stage.
“…In addition, the statistical parameters depend entirely on the sample length and instrument resolution. 12 Based on the GW model and the Hertz contact theory, Ke et al 15 proposed an electric contact model with the real contact total length (RCTL), aiming to evaluate the static stiffness of linear motion roller guide without preload. In Tomota et al, 16 using the GW model, an asperities distribution model considering skewness and kurtosis of non-Gaussian surface was proposed, which aimed to calculate the real contact area between smooth and rough surfaces.…”
High precision, efficiency and reliability are the unremitting pursuits of machinery manufacturing industry. As one of the pivotal function parts of high-end NC machine tool, precise linear guideway determines the machining precision and operation performance. Accurate evaluation and prediction of surface topography are the crucial effects on the matching performance of linear guideway. In this paper, the real contact area is regarded as a key parameter, a multi-scale method with the fractal theory is proposed. First, the contact area of a single asperity was obtained with Hertz contact theory. Afterwards, the contact area between rough surfaces was deduced by the fractal theory. Finally, using the proposed multi-scale contact mechanics model, the real contact area between rough plane and cylinder was obtained by integral solution. Compared with the former fractal model and GW model, the proposed model on the real contact area calculation of linear guideway is more accurate and comprehensive. The effect factors of load, fractal parameter and friction were discussed, the increasing rate of real contact area of smoother surface is greater as load increases. The proposed model may provide practical guidance for assembly accuracy and surface quality requirements at design stage.
The purpose of this study is to investigate the modeling method of static stiffness for the linear motion roller guide (LMRG) with five degrees-of-freedom (5DOF). The model of static stiffness for the LMRG with 5DOF was established using the slicing method, the guide deformation compatible equation, and the force equilibrium equation of the guide. The static stiffness of the LMRG was analyzed systematically via a case study, and the simulating results were verified by the experimental data. The results show that the proposed model can be used to calculate the complete static stiffness for the LMRG with 5DOF.
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