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Suppression of machine tool spindle vibration using TiC-SKH51 metal-matrix composite
Wonjun Bae,김성태,김양진,Sang-Kwan Lee 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.8
The generation of machine tool spindle vibration is becoming prevalent as high-speed machining and lightweight design are being actively applied in the machining process. As the required machining accuracy increases, the machine tool spindle vibration generated in ultra-precision machining is the main cause of the deterioration of the machining quality. In this study, a TiC-SKH51 metal-matrix composite was used to suppress the machine tool spindle vibration. A vibration characteristic test was conducted to obtain the dynamic characteristics of the TiC-SKH51 and other testing materials. By comparing the results of the vibration characteristic test, the reliability of the finite element analysis software was confirmed. Then, dynamic and static analyses were performed to obtain the dynamic and static characteristics of the machine tool spindle model. The analysis results show that the TiC-SKH51 machine tool spindle can directly suppress the generation of spindle vibrations.
Study on motorized spindle with full ceramic ball bearings and lubrication at high speeds
Yonghua Wang,Songhua Li,Chao Wei,Yu Zhang,Gefei Lin,Dong An,Jining Zhao 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.4
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.
안대철(Dae-Chul Ahn),신응수(Eung-Soo Shin),이윤상(Yoon-Sang Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This study provides an experimental investigation into the dynamic characteristics of a wafer-dicing air spindle. A primary objective is to find out the effects of the spindle tip loads on the dynamic behavior of the spindle shaft. A test rig has been developed, which consists of an air spindle, a load-imposing device, sensors including load cells, accelerometers and gap sensors, a data acquisition system based on Labview. Results show that both the spindle loads and the shaft speed significantly affect the lateral displacement of the spindle shaft.