Study on motorized spindle with full ceramic ball bearings and lubrication at high speeds
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The lubrication methods and material characteristics of high-speed rolling bearings significantly impact the vibration andtemperature of motorized spindles in high-speed machine tools. This study focuses on replacing traditional metal bearingswith full ceramic ball bearings and analyzes three different types of bearings: Si3N4-Si3N4, ZrO2-Si3N4, and GCr15-GCr15. Based on the quasi-static and oil film thickness theory of bearing, the influence of rotational speed on the centrifugal forceof bearings of different materials and the oil film thickness of the raceway center of inner and outer rings was analyzed. According to different lubrication methods, the vibration and temperature rise characteristics of motorized spindle bearingsystems under high-speed working conditions are analyzed in experiment. The results indicate that Si3N4-Si3N4 bearingsexhibit lower centrifugal force and thicker oil films than the others. The experimental results show that the vibration-effectivevalue of the Si3N4-Si3N4 bearing is lower than that of the other two materials when the speed is higher. Grease lubricationslightly reduces vibration acceleration compared to oil-air lubrication. The temperature rise difference of motorized spindle ofoil-air lubricated full ceramic bearings is smaller than that of grease lubrication, and the average temperature rise differenceis 4℃. Full ceramic bearings outperform steel bearings in all aspects under the same working conditions, and the Si3N4-Si3N4bearing embodies the advantages of dynamic and thermal performance.
Abstract
The lubrication methods and material characteristics of high-speed rolling bearings significantly impact the vibration andtemperature of motorized spindles in high-speed machine tools. This study focuses on replacing traditional metal bearingswith full ceramic ball bearings and analyzes three different types of bearings: Si3N4-Si3N4, ZrO2-Si3N4, and GCr15-GCr15. Based on the quasi-static and oil film thickness theory of bearing, the influence of rotational speed on the centrifugal forceof bearings of different materials and the oil film thickness of the raceway center of inner and outer rings was analyzed. According to different lubrication methods, the vibration and temperature rise characteristics of motorized spindle bearingsystems under high-speed working conditions are analyzed in experiment. The results indicate that Si3N4-Si3N4 bearingsexhibit lower centrifugal force and thicker oil films than the others. The experimental results show that the vibration-effectivevalue of the Si3N4-Si3N4 bearing is lower than that of the other two materials when the speed is higher. Grease lubricationslightly reduces vibration acceleration compared to oil-air lubrication. The temperature rise difference of motorized spindle ofoil-air lubricated full ceramic bearings is smaller than that of grease lubrication, and the average temperature rise differenceis 4℃. Full ceramic bearings outperform steel bearings in all aspects under the same working conditions, and the Si3N4-Si3N4bearing embodies the advantages of dynamic and thermal performance.
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