Linear motion (LM) guides supported by rolling elements are used for accurate positioning of precision machine. For accurate positioning, the frictional behavior of the LM guide must be understood. In this thesis, a new experiment is conducted to measure friction, and the behavior of LM roller guide...
Linear motion (LM) guides supported by rolling elements are used for accurate positioning of precision machine. For accurate positioning, the frictional behavior of the LM guide must be understood. In this thesis, a new experiment is conducted to measure friction, and the behavior of LM roller guide friction is measured under various external loads, preloads, velocities, and lubricants. The results obtained from experiment are compared with reference data, and the experimental friction equation of LM roller guide is achieved from experiment, which can be used to calculate LM roller guide friction and control positioning accuracy. The following conclusions are drawn from the present study: 1.With the increase of external load, the friction force increases. And the value of friction coefficient decreases with increase of external load. 2.When the velocity is smaller than 0.005 m/s, the friction force with high kinematic viscosity is smaller than friction force with low kinematic viscosity. However, for velocities above 0.005 m/s, the friction force with high kinematic viscosity is higher than friction force with low kinematic viscosity. 3.When a preload is applied to increase rigidity, the friction force also increases. Therefore, the friction force increases as the preload increases. 4.The experimental equation achieved from experiment results can express the behavior of LM roller guide, and the relationship among friction characteristic, external load, preload, velocity and lubrication can be analyzed using this empirical equation
Linear motion (LM) guides supported by rolling elements are used for accurate positioning of precision machine. For accurate positioning, the frictional behavior of the LM guide must be understood. In this thesis, a new experiment is conducted to measure friction, and the behavior of LM roller guide friction is measured under various external loads, preloads, velocities, and lubricants. The results obtained from experiment are compared with reference data, and the experimental friction equation of LM roller guide is achieved from experiment, which can be used to calculate LM roller guide friction and control positioning accuracy. The following conclusions are drawn from the present study: 1.With the increase of external load, the friction force increases. And the value of friction coefficient decreases with increase of external load. 2.When the velocity is smaller than 0.005 m/s, the friction force with high kinematic viscosity is smaller than friction force with low kinematic viscosity. However, for velocities above 0.005 m/s, the friction force with high kinematic viscosity is higher than friction force with low kinematic viscosity. 3.When a preload is applied to increase rigidity, the friction force also increases. Therefore, the friction force increases as the preload increases. 4.The experimental equation achieved from experiment results can express the behavior of LM roller guide, and the relationship among friction characteristic, external load, preload, velocity and lubrication can be analyzed using this empirical equation
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