Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2905
標題: 聲射訊號於進給平台滾珠導螺桿預拉之研究
Study of Acoustic Emission Signals for Pretension of Ball Screw on feed Drive Table
作者: 林奕廷
Lin, Yi-Ting
關鍵字: 滾珠導螺桿
Ball screw
預拉失效
聲射感測器
快速傅立葉轉換
群組分離準則
Pretension loss
Acoustic Emission Sensor
Fast Fourier Transform
Class mean scatter criteria
出版社: 機械工程學系所
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摘要: 工具機內之傳動元件「滾珠導螺桿」會因溫升產生熱變位,進而影響加工精度,所以需要對滾珠導螺桿作預拉來抵抗。本篇研究論文主要目的是想找出一種能判別滾珠導螺桿預拉狀態之方法,以判斷滾珠導螺桿預拉是否失效。預拉螺桿會直接影響軸承,因此,藉由聲射(AE)感測器能接收材料物理波的特性,將其裝置在軸承座上,藉由預拉螺桿時會擠壓軸承,間接從軸承座上擷取聲射訊號,使用快速傅立葉轉換(FFT),將時域訊號轉換為頻譜訊號,並透過群組分離準則(Class mean scatter criteria)找出不同預拉下頻譜訊號間的差異量,並從中挑選差異量最大與次大之特徵頻率,將此特徵頻率輸入費雪線性辨別函式(Fisher linear discriminant function)進行判別。實驗中不同預拉量分別為0μm、10μm、20μm,並採用七種不同螺桿轉速,分別為300rpm、600 rpm、900 rpm、1200、1500 rpm、1800 rpm、2100 rpm ;以及三種不同螺帽預壓力,分別是最大額定動態負載的2%、4%、6%,然後將以上這些參數一併作分析探討。實驗結果顯示,300rpm、900rpm時判別率較差,小於80%,1200rpm~2100rpm時判別率較佳,為80%~100%。
Transmission components “ball screws “ within the machine tool ,will have thermal displacement due to the temperature rise and it will affect machining accuracy of machine tool. So ball screw should be pretension. The main propose of this study is to find out a method to estimation the condition of ball screw pretension, and use it to predict pretension loss of ball screw. The pretension of ball screw should have influence on bearing, so we use the characteristic that can receive the elastic wave on solid material of Acoustic Emission(AE) Sensor, and install it on the bearing seat. It can retrieve AE signal from bearing seat indirectly because bearing could be compress be pretension. We use Fast Fourier Transform(FFT) to transform the AE signal from time domain to frequency domain and use Class mean scatter criteria to find out the different from frequency signal of different pretension. We can pick up the different of maximum and the second one be the characteristic frequency, and input it to Fisher linear discriminant function for distinguishing. In the experiment, there were three magnitudes of pretension, 0μm, 10μm, 20μm. ,and we adopt 7 different ball screw rotational speeds, i.e. 300rpm, 600rpm, 900rpm, 1200rpm, 1500rpm, 1800rpm, 2100rpm and three kinds of preload, i.e. 2%, 4%, 6% of ball screw maximum rating dynamic loading are taken into account for the discussion and analysis. The result show that ratio of discriminant on 300rpm and 600rpm is worse, less than 80%, and the ratio od discriminant on 900rpm~2100rpm is better than 300rpm and 600rpm, is 80%~100%.
URI: http://hdl.handle.net/11455/2905
其他識別: U0005-2610201211361000
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2610201211361000
Appears in Collections:機械工程學系所

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