Vibration monitoring of motorized spindles using spectral analysis techniques |
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| Authors: | Ching-Feng Chang Jin-Jia Chen |
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| Affiliation: | 1. Department of Electrical Engineering, National Chang-Hua University of Education, 56 Lane 318 Der-Sheng Road, Ta-Ya, Taichung County 428, Taiwan;2. Department of Electrical Engineering, National Chang-Hua University of Education, 2 Shih-Da Road, Changhua 520, Taiwan;1. Ph.D Program of Mechanical and Aeronautical Engineering, Feng Chia University, No. 100 Wenhwa Rd., Seatwen, Taichung 40724, Taiwan ROC;2. Department of Mechanical and Computer-Aided Engineering, and Electroacoustic Graduate Program, Feng Chia University, No.100 Wenhwa Rd, Seatwen, Taichung 40724, Taiwan ROC;1. Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin 300355, China;2. School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China;3. School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China;4. Beijing Precision Machinery & Engineering Research Co., Ltd., Beijing 101312, China;5. School of Engineering, University of Warwick, Coventry CV4 7AL, UK |
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| Abstract: | High speed machining (HSM) technology is used in a broad range of applications to machine ferrous metals and nonmetallic material. The motorized spindle is one of the major elements to keep the machine running at high productivity. Though the motorized spindle will generate high power and torque at high speed, high removable rate, but the thermal characteristics are more dynamical, speed-dependent and non-linear. The air gap between rotor and stator changes with speed and time, the expansion of rotor, the highly complicated mechanical coupling as well as interface of the mechanical structure. All these factors create centrifugal force to the rotating bearings which not only heat these bearings up, causing bad tolerance, but also create the vibration problem. The worse situation may cause the bearings choked.In this paper, a piezo transducer is used to check the spindle vibration. Once the spindle is out of balance, the transducer gives a dialog response to computerized numerical controller (CNC) which is set with a control level. Based on ISO standard, 2 mm/s is the max acceptable vibration and designed in accordance with 2 V output voltage. Any higher voltage will enable the CNC shut down the spindle before the bearings are damaged. This new concept will prevent spindle from turning dead. As a result, the spectral analysis techniques can record the condition of spindle rotation even under the condition of misoperation. |
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