JP2012137327A - Vibration detecting device and vibration detecting method - Google Patents

Vibration detecting device and vibration detecting method Download PDF

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JP2012137327A
JP2012137327A JP2010288459A JP2010288459A JP2012137327A JP 2012137327 A JP2012137327 A JP 2012137327A JP 2010288459 A JP2010288459 A JP 2010288459A JP 2010288459 A JP2010288459 A JP 2010288459A JP 2012137327 A JP2012137327 A JP 2012137327A
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vibration
sound
frequency
chatter
detection range
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JP5637840B2 (en
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Akihide Hamaguchi
顕秀 浜口
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Okuma Corp
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Okuma Machinery Works Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a vibration detecting device capable of accurately grasping a chattering frequency and further accurately calculating a stable rotational speed.SOLUTION: A vibration detecting device comprises a sounding device 8 capable of outputting sounds of various frequencies, and the sounding device 8 outputs a sound of a frequency corresponding to a signal component with a maximum sound pressure in a detection range precedently set, so that an operator may compare a vibration sound with the output sound. Therefore, although a microphone 2 unavoidably detects sound pressures of sounds generated around a rotation shaft housing 1 including a vibration sound generated from a rotation shaft 3 under rotation, the operator may remove various noise from the detected sounds so as to accurately grasp a chattering frequency of the vibration sound derived from chattering vibration. A stable rotational speed at which a higher effect to suppress the chattering vibration may be exhibited than by a conventional technique may be obtained by calculating a stable rotational speed on the basis of the chattering frequency.

Description

本発明は、工具又はワークを回転させながら加工を行う工作機械において、加工中に発生するびびり振動を検出するための振動検出装置及び振動検出方法に関するものである。   The present invention relates to a vibration detection apparatus and a vibration detection method for detecting chatter vibration generated during machining in a machine tool that performs machining while rotating a tool or a workpiece.

従来、たとえば工具を回転させてワークの表面を切削加工するような工作機械においては、工具の剛性が低い等の理由により、加工中にびびり振動が発生することがある。そこで、このびびり振動を検出するための技術として、たとえば特許文献1に記載の技術がある。これは、音圧を検出可能なマイクロフォン(以下、マイクと称す)を用いてびびり振動とその周波数(びびり周波数)を検出しようというものである。また、そのようにして検出したびびり周波数を用いて安定回転速度を求めるに際しては、たとえば特許文献2に開示されているような下記式(1)、(2)を用いればよいことも知られている。
安定回転速度={60×びびり周波数/工具刃数×(k値+1)} ・・・(1)
k値=60×びびり周波数/(現在の回転速度×工具刃数)の整数部分 ・・・(2)
尚、工具刃数は、たとえば回転軸としての主軸に装着されている工具の刃数である。
2. Description of the Related Art Conventionally, for example, in a machine tool that cuts the surface of a workpiece by rotating a tool, chatter vibration may occur during machining due to the low rigidity of the tool. Thus, as a technique for detecting this chatter vibration, for example, there is a technique described in Patent Document 1. This is to detect chatter vibration and its frequency (chatter frequency) using a microphone (hereinafter referred to as a microphone) capable of detecting sound pressure. It is also known that the following formulas (1) and (2) as disclosed in Patent Document 2, for example, may be used when obtaining the stable rotational speed using the detected chatter frequency in this way. Yes.
Stable rotational speed = {60 × chat frequency / number of tool blades × (k value + 1)} (1)
k value = 60 × chatter frequency / integer part of (current rotation speed × number of tool blades) (2)
The number of tool blades is, for example, the number of blades of a tool mounted on a main shaft as a rotation axis.

特表2001−517557号公報JP-T-2001-517557 特開2007−44852号公報JP 2007-44852 A

一般的に、加工中にはびびり振動とは異なる振動やノイズによって振動音に似た音が発生することがある。しかしながら、特許文献1に記載の技術では、検出した振動及び周波数がびびり振動によるもの(すなわち、びびり周波数)であるか、それともびびり振動以外の振動やノイズによるものであるのかを判断することができないため、特許文献2に開示されている式(1)、(2)を用いたところで、正確な安定回転速度を求めることができないことがあった。   Generally, during processing, a sound similar to vibration sound may be generated due to vibration or noise different from chatter vibration. However, with the technique described in Patent Document 1, it cannot be determined whether the detected vibration and frequency are due to chatter vibration (that is, chatter frequency) or due to vibration or noise other than chatter vibration. For this reason, when using the equations (1) and (2) disclosed in Patent Document 2, an accurate stable rotation speed may not be obtained.

そこで、本発明は、上記問題に鑑みなされたものであって、びびり周波数を正確に捉えることが可能で、ひいては一層精度の高い安定回転速度の算出をも図ることができる振動検出装置及び振動検出方法を提供しようとするものである。   Therefore, the present invention has been made in view of the above-described problem, and can detect the chatter frequency accurately, and thus can calculate a stable rotational speed with higher accuracy, and a vibration detection device. Is to provide a method.

上記目的を達成するために、本発明のうち請求項1に記載の発明は、工具又はワークを回転させるための回転軸を備えた工作機械において、前記回転軸に生じる時間軸上での振動を検出する振動検出手段と、前記振動検出手段により検出される前記時間軸上での振動をFFT解析して周波数軸上での振動を求める振動演算装置と、前記演算装置を操作するための入力装置とを備えた振動検出装置であって、前記周波数軸上において検出範囲を任意に設定可能な範囲設定装置と、前記周波数軸上での振動のうち、前記検出範囲内において振動が最大となる周波数の音を出力する発音制御装置とを備えたことを特徴とする。
また、上記目的を達成するために、本発明のうち請求項2に記載の発明は、工具又はワークを回転させるための回転軸を備えた工作機械において、前記回転軸に生じるびびり振動を検出するための振動検出方法であって、周波数軸上で検出範囲を任意に設定する第1工程と、前記回転軸に生じる時間軸上での振動を検出する第2工程と、前記時間軸上での振動をFFT解析して周波数軸上での振動を求める第3工程と、前記周波数軸上での振動のうち、前記検出範囲内において振動が最大となる周波数の音を出力する第4工程と、前記回転軸から発生しているびびり振動に起因する振動音と出力された音とが一致するか否かを判断し、一致している場合には出力された音の周波数を前記びびり振動に係るびびり周波数として特定する第5工程とを実行することを特徴とする。
In order to achieve the above object, the invention according to claim 1 of the present invention is a machine tool provided with a rotating shaft for rotating a tool or a workpiece, wherein vibration on the time axis generated on the rotating shaft is reduced. Vibration detecting means for detecting, vibration calculating device for obtaining vibration on the frequency axis by performing FFT analysis on the vibration on the time axis detected by the vibration detecting means, and an input device for operating the calculating device A range setting device capable of arbitrarily setting a detection range on the frequency axis, and a frequency at which the vibration is maximum within the detection range among the vibrations on the frequency axis. And a sound generation control device that outputs the sound of the above.
In order to achieve the above object, the invention according to claim 2 of the present invention detects chatter vibration generated on the rotary shaft in a machine tool including a rotary shaft for rotating a tool or a workpiece. A vibration detecting method for detecting a vibration on the time axis, a first step of arbitrarily setting a detection range on the frequency axis, a second step of detecting vibration on the time axis, and the time axis. A third step of obtaining a vibration on the frequency axis by performing FFT analysis of the vibration; a fourth step of outputting a sound having a frequency at which the vibration is maximum within the detection range among the vibrations on the frequency axis; It is determined whether or not the vibration sound caused by chatter vibration generated from the rotating shaft matches the output sound, and if they match, the frequency of the output sound is related to the chatter vibration. 5th process specified as chatter frequency Characterized by a run.

本発明によれば、周波数軸上において検出範囲を任意に設定可能な範囲設定装置と、周波数軸上での振動のうち検出範囲内で振動が最大となる周波数の音を出力する発音制御装置とを備えているため、作業者は、検出範囲を任意に設定しながら、実際に生じているびびり振動の振動音と発音制御装置から出力される出力音とを比較することにより、正確なびびり周波数を捉えることができる。したがって、このようにして正確に捉えたびびり周波数にもとづいて安定回転速度を算出することにより、従来よりもびびり振動の抑制効果の高い安定回転速度を求めることができる。   According to the present invention, a range setting device that can arbitrarily set a detection range on the frequency axis, and a sound generation control device that outputs a sound having a frequency at which the vibration is maximum within the detection range among vibrations on the frequency axis, Therefore, the operator can set an accurate chatter frequency by comparing the vibration sound of the actual chatter vibration with the output sound output from the sound generation control device while arbitrarily setting the detection range. Can be captured. Therefore, by calculating the stable rotational speed based on the chatter frequency accurately in this way, it is possible to obtain a stable rotational speed that has a higher chatter vibration suppressing effect than in the prior art.

振動検出装置のブロック構成を示した説明図である。It is explanatory drawing which showed the block structure of the vibration detection apparatus. 振動検出制御を示したフローチャート図である。It is the flowchart figure which showed vibration detection control. 表示装置における周波数軸上での音圧(振動)の表示態様を示した説明図である。It is explanatory drawing which showed the display mode of the sound pressure (vibration) on the frequency axis in a display apparatus. 作業者により検出範囲が設定された状態を示した説明図である。It is explanatory drawing which showed the state by which the detection range was set by the operator. 検出範囲の下限が変更された状態を示した説明図である。It is explanatory drawing which showed the state from which the minimum of the detection range was changed. 検出範囲の上限が変更され、びびり周波数が特定された状態を示した説明図である。It is explanatory drawing which showed the state by which the upper limit of the detection range was changed and the chatter frequency was specified.

以下、本発明の一実施形態となる振動検出装置について、図面にもとづき詳細に説明する。   Hereinafter, a vibration detection apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

図1は、振動検出装置4及び周辺装置のブロック構成を示した説明図である。
振動検出装置4は、回転軸ハウジング1に上下方向を軸として回転可能に備えられた回転軸3に生じる「びびり振動」を検出するためのものであって、回転中の回転軸3から発生する振動音を含む回転軸ハウジング1周辺に生じている音の音圧を検出するためのマイク2と、マイク2が接続され、該マイク2により検出される音のFFT解析を行い、回転軸ハウジング1周辺に生じている音の音圧と振動周波数との関係を求める演算装置5と、演算装置5において求められた音圧と振動周波数との関係を、たとえば図3に示すような態様で表示する表示装置6と、演算装置5に対して各種数値を入力したり、演算装置5を設定したりするための入力装置7と、演算装置5による制御のもと所定の振動音を発生させる発音装置8とを備えてなる。尚、9は、回転軸3の回転速度を変更したりして回転軸ハウジング1における加工を制御するNC装置であり、10は、該NC装置9を操作するための操作装置である。
FIG. 1 is an explanatory diagram showing a block configuration of the vibration detection device 4 and peripheral devices.
The vibration detection device 4 is for detecting “chatter vibration” generated in the rotary shaft 3 provided in the rotary shaft housing 1 so as to be rotatable about the vertical direction, and is generated from the rotating rotary shaft 3 during rotation. A microphone 2 for detecting the sound pressure of the sound generated around the rotating shaft housing 1 including vibration sound and the microphone 2 are connected, and FFT analysis of the sound detected by the microphone 2 is performed, and the rotating shaft housing 1 The computing device 5 for obtaining the relationship between the sound pressure of the sound generated in the vicinity and the vibration frequency, and the relationship between the sound pressure and the vibration frequency obtained by the computing device 5 are displayed in a manner as shown in FIG. 3, for example. A display device 6, an input device 7 for inputting various numerical values to the computing device 5 and setting the computing device 5, and a sounding device for generating a predetermined vibration sound under the control of the computing device 5 With 8 Reference numeral 9 denotes an NC device that controls the machining of the rotary shaft housing 1 by changing the rotational speed of the rotary shaft 3, and 10 is an operating device for operating the NC device 9.

ここで、振動検出装置4を用いた「びびり振動」の振動検出作業、及びNC装置9等を用いての振動抑制作業について、図2のフローチャート図にしたがい説明する。
まず、加工を開始するよりも前に、作業者は、演算装置5においてマイク2で検出される振動音をFFT解析した後で後述の如くして発音装置8から発音させる際に参照する周波数の検出範囲を任意に設定する(S1)。その後、加工を開始し(S2)、びびり振動に起因する振動音の発生を認識すると、作業者は入力装置7を操作して、発音装置8から1kHzの音を出力させる(S3)。そして、作業者は、振動音と1kHzの出力音とを比較し(S4)、振動音が出力音よりも高い場合(S4でYES)、入力装置7を操作して検出範囲の下限を1kHzに変更する(S5)。一方、振動音が出力音よりも低い場合(S4でNO)、入力装置7を操作して検出範囲の下限を0.1kHzに変更する(S6)。
Here, the vibration detection work using “vibration vibration” using the vibration detection apparatus 4 and the vibration suppression work using the NC apparatus 9 will be described with reference to the flowchart of FIG.
First, before starting the processing, the operator performs an FFT analysis on the vibration sound detected by the microphone 2 in the arithmetic device 5 and then sets the frequency to be referred to when the sound generation device 8 generates a sound as described later. A detection range is arbitrarily set (S1). Thereafter, machining is started (S2), and when the generation of vibration sound due to chatter vibration is recognized, the operator operates the input device 7 to output a sound of 1 kHz from the sound generator 8 (S3). Then, the operator compares the vibration sound with the output sound of 1 kHz (S4). If the vibration sound is higher than the output sound (YES in S4), the operator operates the input device 7 to set the lower limit of the detection range to 1 kHz. Change (S5). On the other hand, when the vibration sound is lower than the output sound (NO in S4), the input device 7 is operated to change the lower limit of the detection range to 0.1 kHz (S6).

一方、演算装置5では、マイク2で検出される音圧のFFT解析を行っており(S7)、上記S3〜S6の如くして検出範囲が設定されると、設定された検出範囲内において音圧が最大となる信号成分を見出し、該信号成分に相当する周波数の音を発音装置8から出力させる(S8)。すると、作業者は、振動音とS8で発音装置8から出力された出力音とを比較し(S9)、両者が一致していると(S9でYES)、発音装置8から出力されている出力音の周波数がびびり周波数であることになるため、出力音の周波数をびびり周波数と設定し(S13)、たとえば上記式(1)、(2)を用いて安定回転速度を算出するとともに、操作装置10によりNC装置9を介して回転軸3の回転速度を安定回転速度へ変更し、びびり振動の抑制を図る。   On the other hand, the arithmetic unit 5 performs FFT analysis of the sound pressure detected by the microphone 2 (S7), and when the detection range is set as in S3 to S6, the sound is detected within the set detection range. A signal component having the maximum pressure is found, and a sound having a frequency corresponding to the signal component is output from the sound producing device 8 (S8). Then, the operator compares the vibration sound with the output sound output from the sound generator 8 in S8 (S9), and if they match (YES in S9), the output output from the sound generator 8 Since the frequency of the sound is the chatter frequency, the frequency of the output sound is set as the chatter frequency (S13), and the stable rotation speed is calculated using, for example, the above formulas (1) and (2). 10, the rotational speed of the rotary shaft 3 is changed to a stable rotational speed via the NC device 9 to suppress chatter vibration.

また、作業者は、振動音とS8で発音装置8から出力された出力音とを比較した結果、両者が異なっている場合(S9でNO)、続いて振動音が出力音よりも高いか低いかを判断する(S10)。その結果、振動音が高い場合(S10でYES)、入力装置7を操作して検出範囲の下限を出力音の周波数よりも高い周波数へと変更する(S11)一方、振動音が出力音よりも低い場合(S10でNO)、検出範囲の上限を出力音の周波数よりも低い周波数へと変更する(S12)。そして、新たな検出範囲において発音装置8から音を出力させ、振動音と出力音とが一致する(S9でYESとなる)までS7〜S12までを繰り返す。   In addition, when the operator compares the vibration sound and the output sound output from the sounding device 8 in S8 and the two are different (NO in S9), the vibration sound is higher or lower than the output sound. Is determined (S10). As a result, when the vibration sound is high (YES in S10), the input device 7 is operated to change the lower limit of the detection range to a frequency higher than the frequency of the output sound (S11), while the vibration sound is higher than the output sound. If it is low (NO in S10), the upper limit of the detection range is changed to a frequency lower than the frequency of the output sound (S12). Then, a sound is output from the sound generation device 8 in a new detection range, and S7 to S12 are repeated until the vibration sound and the output sound match (YES in S9).

尚、演算装置5では、S7で行うマイク2で検出される音圧のFFT解析の結果を、ピークホールド波形21として、図3で示すような態様で表示装置6に表示させている。尚、図3中における22は検出範囲の下限を、23は検出範囲の上限を夫々示しており、当該検出範囲内において音圧が最大となる信号成分24に相当する周波数の音が発音装置8から出力されることになる。また、25は、作業者に信号成分24を視認させるためのマーカーである。   In the arithmetic unit 5, the result of the FFT analysis of the sound pressure detected by the microphone 2 performed in S7 is displayed as a peak hold waveform 21 on the display unit 6 in the manner shown in FIG. In FIG. 3, 22 indicates the lower limit of the detection range, and 23 indicates the upper limit of the detection range, and the sound of the frequency corresponding to the signal component 24 having the maximum sound pressure within the detection range is generated by the sound generator 8. Will be output. Reference numeral 25 denotes a marker for allowing the operator to visually recognize the signal component 24.

上記振動検出作業及び振動抑制作業を、図4〜図6にもとづいて、より具体的に記載すると、たとえばS1において図4に示す如く、検出範囲の下限を0.1kHz、上限を10kHzに設定し、S2において加工を開始したとする。しかしながら、この検出範囲のままでは、低周波の暗騒音(図4中の26)が最大音圧となる信号成分となるため、この信号成分に相当する周波数の音が発音装置8から出力されてしまう。そこで、1kHzの音を出力して(S3)暗騒音26と比較させる(S4)ことにより、図5に示す如く検出範囲の下限を1kHzへと変更させ(S5)、暗騒音26を検出範囲から除く。ただ、検出範囲の下限を1kHzとしただけでは、サイレンなどのびびり振動以外に起因するノイズ(図4中の27)が最大音圧となるため、S8では当該ノイズと同じ周波数の音が発音装置8から出力されることになり、S9では振動音と出力音とが一致しないと判断される。そこで、当該ノイズ27を検出範囲から除くべく、S12において検出範囲の上限がノイズ27の周波数よりも低い周波数へと変更される。すると、検出範囲が図6に示すような範囲となり、びびり振動に起因する周波数、すなわちびびり周波数を正確に得ることができ、2回目のS8ではびびり周波数の音が発音装置8から出力されることになる。したがって、S9で振動音と出力音との一致が確認され、該びびり周波数にもとづいて最適な安定回転速度の算出が可能となるのである。   More specifically describing the vibration detection operation and the vibration suppression operation based on FIGS. 4 to 6, for example, in S1, the lower limit of the detection range is set to 0.1 kHz and the upper limit is set to 10 kHz as shown in FIG. Suppose that the processing is started in S2. However, in this detection range, since low frequency background noise (26 in FIG. 4) becomes a signal component having the maximum sound pressure, a sound having a frequency corresponding to this signal component is output from the sound producing device 8. End up. Therefore, by outputting a 1 kHz sound (S3) and comparing it with the background noise 26 (S4), the lower limit of the detection range is changed to 1 kHz as shown in FIG. 5 (S5), and the background noise 26 is removed from the detection range. except. However, if the lower limit of the detection range is set to 1 kHz, noise (27 in FIG. 4) caused by chatter vibrations such as sirens becomes the maximum sound pressure. 8 and the vibration sound and the output sound are determined not to coincide with each other in S9. Therefore, in order to remove the noise 27 from the detection range, the upper limit of the detection range is changed to a frequency lower than the frequency of the noise 27 in S12. Then, the detection range becomes a range as shown in FIG. 6, and the frequency caused by chatter vibration, that is, the chatter frequency can be accurately obtained, and the sound of the chatter frequency is output from the sound producing device 8 in the second S8. become. Therefore, the coincidence between the vibration sound and the output sound is confirmed in S9, and the optimum stable rotation speed can be calculated based on the chatter frequency.

以上のような振動検出装置4及び振動検出方法によれば、種々の周波数の音を出力可能な発音装置8を備えており、当該発音装置8から、任意に設定された検出範囲内において最大音圧となる信号成分に相当する周波数の音を出力し、作業者に振動音と出力音との比較を行わせるようになっている。したがって、マイク2では回転中の回転軸3から発生する振動音を含む回転軸ハウジング1周辺に生じている音の音圧を検出してしまうものの、作業者は、その中から種々のノイズを除き、びびり振動に起因する振動音のびびり周波数を正確に捉えることができる。そして、該びびり周波数にもとづいて安定回転速度を算出することにより、従来よりもびびり振動の抑制効果の高い安定回転速度を求めることができる。   According to the vibration detection device 4 and the vibration detection method as described above, the sound generation device 8 capable of outputting sounds of various frequencies is provided, and the maximum sound is output from the sound generation device 8 within an arbitrarily set detection range. A sound having a frequency corresponding to the signal component that becomes the pressure is output, and the operator is made to compare the vibration sound with the output sound. Therefore, although the microphone 2 detects the sound pressure of the sound generated around the rotating shaft housing 1 including the vibration sound generated from the rotating rotating shaft 3, the operator removes various noises from the sound pressure. It is possible to accurately capture the chatter frequency of vibration sound caused by chatter vibration. Then, by calculating the stable rotation speed based on the chatter frequency, it is possible to obtain a stable rotation speed that has a higher chatter vibration suppression effect than before.

なお、本発明に係る振動検出装置は、上記実施形態の態様に何ら限定されるものではなく、振動検出手段、演算装置における振動検出制御、発音装置からの音の出力態様等に係る構成を、本発明の趣旨を逸脱しない範囲で、必要に応じて適宜変更することができる。   In addition, the vibration detection apparatus according to the present invention is not limited to the aspect of the above-described embodiment, and the configuration relating to the vibration detection means, the vibration detection control in the arithmetic unit, the sound output form from the sound generator, and the like, The present invention can be changed as appropriate without departing from the spirit of the present invention.

たとえば、上記実施形態では、回転軸の振動を検出するための手段としてマイク2を採用しているが、マイク2に代えて加速度ピックアップや変位計を採用し、音圧ではなく振動加速度や振動変位を検出し、FFT解析により周波数軸上での振動加速度や振動変位を求め、上記同様に、振動加速度や振動変位が最大となる周波数で音を出力させるように構成することも可能である。
また、上記実施形態では、S3で1kHzの音を発音装置8から出力するように構成しているが、作業者が熟練者であるような場合を考えて、1kHzの音を出力することなく検出範囲の下限を設定するようにしてもよく、1kHzの音を出力させるための操作ボタンを設ける等することにより、1kHzの音を出力させるか否かは作業者により選択可能に構成することも可能である。尚、S3で出力させる音が1kHzに拘らないことは言うまでもないし、S5やS6において検出範囲の下限を何kHzとするか等についても適宜変更可能である。
For example, in the above embodiment, the microphone 2 is employed as a means for detecting vibration of the rotating shaft. However, an acceleration pickup or a displacement meter is employed instead of the microphone 2, and vibration acceleration or vibration displacement is used instead of sound pressure. It is also possible to detect vibration acceleration and vibration displacement on the frequency axis by FFT analysis, and output sound at a frequency at which vibration acceleration and vibration displacement are maximized, as described above.
In the above embodiment, the sound generator 8 is configured to output a sound of 1 kHz in S3. However, detection is performed without outputting a sound of 1 kHz in consideration of a case where the worker is an expert. The lower limit of the range may be set, or by providing an operation button for outputting a 1 kHz sound, it can be configured so that the operator can select whether or not to output a 1 kHz sound. It is. Needless to say, the sound output in S3 is not limited to 1 kHz, and it is possible to appropriately change how many kHz the lower limit of the detection range is set in S5 and S6.

さらに、振動検出装置4にNC装置9等を組み込み、びびり周波数が特定されると、自動的に安定回転速度を算出し、回転軸3の回転速度を安定回転速度へ変更するように構成する、すなわち振動検出装置4に回転速度制御機能を含ませてもよい。
さらにまた、発音装置8から出力する音に関しては、単一音である必要はなく、バンドパスフィルタを用いて、最大音圧となる信号成分を中心に、その前後の周波数範囲外の音を除去した音を発音装置8から出力させるように構成してもよい。
またさらに、S3〜S6までの処理を省略し、作業者が予め設定した検出範囲をもとに音圧が最大となる信号成分を判定するように構成してもよい(すなわち、所定の周波数での音を出力して、検出範囲の下限を変更するという処理を省略してもよい)。
加えて、上記振動検出制御を実加工中に行う必要はなく、試験加工等を行って予めデータを取得し、実加工に活かしたりしても何ら問題はない。
Further, the NC device 9 or the like is incorporated into the vibration detection device 4 and, when the chatter frequency is specified, the stable rotation speed is automatically calculated, and the rotation speed of the rotary shaft 3 is changed to the stable rotation speed. That is, the vibration detection device 4 may include a rotation speed control function.
Furthermore, the sound output from the sound generator 8 does not need to be a single sound, and a bandpass filter is used to remove the sound outside the frequency range before and after the signal component having the maximum sound pressure. The generated sound may be output from the sound generator 8.
Furthermore, the processing from S3 to S6 may be omitted, and the signal component that maximizes the sound pressure may be determined based on the detection range preset by the operator (that is, at a predetermined frequency). The process of outputting the sound and changing the lower limit of the detection range may be omitted).
In addition, it is not necessary to perform the vibration detection control during actual machining, and there is no problem even if data is obtained in advance by performing test machining or the like and utilized for actual machining.

1・・回転軸ハウジング、2・・マイク(振動検出手段)、3・・回転軸、4・・振動検出装置、5・・演算装置(振動演算装置、発音制御装置)、6・・表示装置、7・・入力装置(範囲設定装置)、8・・発音装置(発音制御装置)、9・・NC装置、10・・操作装置。   1 .... Rotating shaft housing, 2..Microphone (vibration detecting means), 3 .... Rotating shaft, 4 .... Vibration detecting device, 5 .... Calculating device (vibration computing device, sound generation control device), 6 .... Display device , 7 .. Input device (range setting device), 8 .. Sound generation device (sound generation control device), 9 .. NC device, 10.

Claims (2)

工具又はワークを回転させるための回転軸を備えた工作機械において、前記回転軸に生じる時間軸上での振動を検出する振動検出手段と、前記振動検出手段により検出される前記時間軸上での振動をFFT解析して周波数軸上での振動を求める振動演算装置と、前記演算装置を操作するための入力装置とを備えた振動検出装置であって、
前記周波数軸上において検出範囲を任意に設定可能な範囲設定装置と、
前記周波数軸上での振動のうち、前記検出範囲内において振動が最大となる周波数の音を出力する発音制御装置とを備えたことを特徴とする振動検出装置。
In a machine tool having a rotating shaft for rotating a tool or a workpiece, vibration detecting means for detecting vibration on the time axis generated on the rotating shaft, and on the time axis detected by the vibration detecting means A vibration detection apparatus comprising: a vibration arithmetic device that performs FFT analysis of vibration to obtain vibration on a frequency axis; and an input device for operating the arithmetic device,
A range setting device capable of arbitrarily setting a detection range on the frequency axis;
A vibration detection device comprising: a sound generation control device that outputs a sound having a frequency at which the vibration is maximum within the detection range among vibrations on the frequency axis.
工具又はワークを回転させるための回転軸を備えた工作機械において、前記回転軸に生じるびびり振動を検出するための振動検出方法であって、
周波数軸上で検出範囲を任意に設定する第1工程と、
前記回転軸に生じる時間軸上での振動を検出する第2工程と、
前記時間軸上での振動をFFT解析して周波数軸上での振動を求める第3工程と、
前記周波数軸上での振動のうち、前記検出範囲内において振動が最大となる周波数の音を出力する第4工程と、
前記回転軸から発生しているびびり振動に起因する振動音と出力された音とが一致するか否かを判断し、一致している場合には出力された音の周波数を前記びびり振動に係るびびり周波数として特定する第5工程と
を実行することを特徴とする振動検出方法。
In a machine tool having a rotating shaft for rotating a tool or a workpiece, a vibration detecting method for detecting chatter vibration generated on the rotating shaft,
A first step of arbitrarily setting a detection range on the frequency axis;
A second step of detecting vibration on the time axis generated in the rotation axis;
A third step of obtaining the vibration on the frequency axis by performing FFT analysis on the vibration on the time axis;
A fourth step of outputting a sound having a frequency at which the vibration is maximum within the detection range among vibrations on the frequency axis;
It is determined whether or not the vibration sound caused by chatter vibration generated from the rotating shaft matches the output sound, and if they match, the frequency of the output sound is related to the chatter vibration. And a fifth step of identifying the chatter frequency.
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