JPH035942B2 - - Google Patents
Info
- Publication number
- JPH035942B2 JPH035942B2 JP57230455A JP23045582A JPH035942B2 JP H035942 B2 JPH035942 B2 JP H035942B2 JP 57230455 A JP57230455 A JP 57230455A JP 23045582 A JP23045582 A JP 23045582A JP H035942 B2 JPH035942 B2 JP H035942B2
- Authority
- JP
- Japan
- Prior art keywords
- saw blade
- abnormality
- detection
- cutter
- trigger level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005856 abnormality Effects 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 23
- 238000005259 measurement Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D59/00—Accessories specially designed for sawing machines or sawing devices
- B23D59/001—Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Machine Tool Sensing Apparatuses (AREA)
Description
【発明の詳細な説明】
本発明は刃物を使う工作機械における刃物の異
常を検出する装置に関し、特に、自動鋸刃交換装
置を装備した鋼管切断装置の鋸刃の交換時期を検
知するために使用される刃物の異常検出装置に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting an abnormality in a cutter in a machine tool that uses a cutter, and is particularly used to detect when to replace a saw blade in a steel pipe cutting device equipped with an automatic saw blade changer. The present invention relates to an abnormality detection device for cutlery.
この種の鋼管切断装置では、自動鋸刃交換装置
によつて自動的に鋸刃を交換するので、鋸刃の交
換時期を検知する必要があり、そのために鋸刃の
異常を検出する装置を具備している。従来、鋸刃
の異常を検出するのに鋸刃駆動電流を用いてい
た。しかしながら、１枚の鋸刃の周囲に付いてい
る切刃（通常40〜60枚）の内、１〜２枚の切刃に
異常が発生しても、鋸刃駆動電流は極めて僅かし
か変動せず、このような僅かの変動では鋸刃が正
常の場合の鋸刃駆動電流と判別出来ないという欠
点があつた。 In this type of steel pipe cutting equipment, the saw blade is automatically replaced by an automatic saw blade changing device, so it is necessary to detect when it is time to replace the saw blade, and for this purpose, a device is installed to detect abnormalities in the saw blade. are doing. Conventionally, saw blade drive current has been used to detect abnormalities in the saw blade. However, even if an abnormality occurs in one or two of the cutting blades (usually 40 to 60) attached around a single saw blade, the saw blade drive current will fluctuate very little. First, there is a drawback that such slight fluctuations cannot be distinguished from the saw blade drive current when the saw blade is normal.
本発明の目的は、上記従来の欠点を解決し、刃
物の異常を適確に検出できる刃物の異常検出装置
を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional drawbacks and to provide an abnormality detection device for cutlery that can accurately detect abnormality in cutlery.
本発明によれば、刃物を使う工作機械における
刃物の異常を検出する装置において、前記工作機
械の運転周期を検出する第１の検出手段と、運転
する前記工作機械の振動状態を検出する第２の検
出手段と、前記第１及び第２の検出手段の出力を
受け、前記工作機械の所定運転周期毎に計測され
た前記振動状態を分析して、前記工作機械の刃物
が正常か否かを判断する手段を有する刃物の異常
検出装置が得られる。 According to the present invention, in a device for detecting an abnormality of a cutter in a machine tool that uses a cutter, the first detection means detects the operating cycle of the machine tool, and the second detection means detects the vibration state of the machine tool in operation. receiving the outputs of the detection means and the first and second detection means, and analyzing the vibration state measured at each predetermined operation cycle of the machine tool to determine whether the cutter of the machine tool is normal or not. A knife abnormality detection device having means for determining can be obtained.
以下、図面を参照して本発明の一実施例につい
て説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図を参照すると、本発明が適用される鋼管
切断装置が示されており、１は鋸刃頭で超硬チツ
プで形成された丸鋸刃１ａを有し、２は丸鋸刃１
ａの回転運動によつて切断される鋼管である。こ
の鋼管切断装置には、制御器３の指令によつて丸
鋸刃１ａを自動的に交換する自動鋸刃交換装置
（図示せず）が装備されている。本発明に係る刃
物（本実施例では丸鋸刃）の異常を検出する装置
は、振動ピツクアツプ４、鋸刃回転ピツクアツプ
５、前置増幅器６，６及び計数器７から成る。振
動ピツクアツプ４は、鋸刃頭１に取付けられ、運
転中における鋸刃頭１の振動を検出するものであ
る。鋸刃回転ピツクアツプ５は、丸鋸刃１ａがそ
の主軸を中心として１回転するごとに１パルスを
出力するものであり、このパルスとパルス間の１
回転周期、すなわち本鋼管切断装置の運転周期を
示す。計数器７は、振動ピツクアツプ４及び鋸刃
回転ピツクアツプ５から出力された信号が前置増
幅器６，６で増幅された信号を入力し、丸鋸刃１
ａの１回転周期毎の計測された鋸刃頭１の振動状
態を分析して、鋸刃頭１の振動が異常な場合、制
御器３へ異常信号を送出するものである。制御器
３は、この異常信号を受けると、丸鋸刃１ａ回転
停止等の処置を行ない、自動鋸刃交換装置等に動
作指令を出力する。 Referring to FIG. 1, a steel pipe cutting device to which the present invention is applied is shown, in which 1 is a saw blade head and has a circular saw blade 1a made of a carbide chip, and 2 is a circular saw blade 1.
This is a steel pipe that is cut by the rotational movement of a. This steel pipe cutting device is equipped with an automatic saw blade changing device (not shown) that automatically changes the circular saw blade 1a according to a command from the controller 3. The device according to the present invention for detecting an abnormality in a cutter (in this embodiment, a circular saw blade) comprises a vibrating pickup 4, a saw blade rotation pickup 5, preamplifiers 6, 6, and a counter 7. The vibration pickup 4 is attached to the saw blade head 1 and detects vibrations of the saw blade head 1 during operation. The saw blade rotation pick-up 5 outputs one pulse every time the circular saw blade 1a rotates around its main axis, and the 1 pulse between these pulses
The rotation period, that is, the operation period of the steel pipe cutting device is shown. The counter 7 inputs a signal obtained by amplifying the signals output from the vibration pick-up 4 and the saw blade rotation pick-up 5 by the preamplifiers 6, 6, and
The vibration state of the saw blade head 1 measured for each rotation period of a is analyzed, and if the vibration of the saw blade head 1 is abnormal, an abnormal signal is sent to the controller 3. When the controller 3 receives this abnormality signal, it takes measures such as stopping the rotation of the circular saw blade 1a, and outputs an operation command to an automatic saw blade changing device or the like.
第２図を参照すると、第２図ａには振動ピツク
アツプ４の出力波形の一例が、第２図ｂには鋸刃
回転ピツクアツプ５の出力波形の一例が示されて
いる。第２図ｂに示されるように、鋸刃回転ピツ
クアツプ５は、丸鋸刃１回転周期Ｔ毎に１パルス
を発生する。丸鋸刃１ａが正常な場合、丸鋸刃１
ａの周囲にある切刃毎の規則正しい振動（第２図
ａの実線及び点線を参照）であるので、計数器７
では、制御器３により、丸鋸刃１回転周期Ｔ毎に
丸鋸刃１ａの切刃の枚数と同じ回数が得られるよ
うに基準トリガレベルTL2が設定され、またこの
基準トリガレベルTL2を基準としてそれより高い
レベルの検出用トリガレベルTL1が設定される。
即ち、制御器３は計数器７と協働して検出用トリ
ガレベルTL1を自動的に設定する。従つて、丸鋸
刃１ａが正常な場合、計数器７では１回転周期Ｔ
の鋸刃頭１の振動波形が基準トリガレベルTL2を
超える回数を計測すると、正常な丸鋸刃１ａの切
刃の枚数が得られる。一方、丸鋸刃１ａが異常
（例えば切刃が欠損）の場合、振動ピツクアツプ
５の出力には、第２図ａの実線で示されるよう
に、１回転周期Ｔ毎に同じ位置に検出用トリガレ
ベルTL1を超える波形が得られる。 Referring to FIG. 2, FIG. 2a shows an example of the output waveform of the vibrating pickup 4, and FIG. 2b shows an example of the output waveform of the saw blade rotary pickup 5. As shown in FIG. 2b, the saw blade rotating pickup 5 generates one pulse for every rotation period T of the circular saw blade. If circular saw blade 1a is normal, circular saw blade 1
Since the vibration is regular for each cutting edge around a (see the solid line and dotted line in Fig. 2 a), the counter 7
Then, the reference trigger level TL 2 is set by the controller 3 so that the same number of cutting edges as the number of cutting edges of the circular saw blade 1a can be obtained per one rotation period T of the circular saw blade, and this reference trigger level TL 2 is set. A higher level detection trigger level TL 1 is set as a reference.
That is, the controller 3 cooperates with the counter 7 to automatically set the detection trigger level TL1 . Therefore, when the circular saw blade 1a is normal, the counter 7 has one rotation period T.
By measuring the number of times the vibration waveform of the saw blade head 1 exceeds the reference trigger level TL2 , the number of normal cutting edges of the circular saw blade 1a can be obtained. On the other hand, if the circular saw blade 1a is abnormal (for example, the cutting edge is missing), the output of the vibration pickup 5 includes a detection trigger at the same position every rotation period T, as shown by the solid line in FIG. 2a. A waveform exceeding level TL 1 can be obtained.
計数器７では、切削開始の信号が入力される
と、丸鋸刃の１回転１パルス（第２図ｂ参照）の
信号によつてゲート時間を設定し、その時間内で
鋸刃頭１の振動波形（第２図ａ参照）が検出用ト
リガレベルTL1を超える回数を計測する。この計
測された回数は、切削開始から終了まべ丸鋸刃１
回転周期Ｔ毎に連続して計測されるので、その数
字の配列を分析することにより、切削開始時や外
乱による過大な振動とは区別できる。従つて、計
数器７では、検出用トリガレベルTL1を超える同
一数が、丸鋸刃１回転周期毎に連続して計測され
た場合、制御器３へ異常信号を送出する。 In the counter 7, when the signal to start cutting is input, the gate time is set by the signal of one pulse per rotation of the circular saw blade (see Fig. 2b), and the saw blade head 1 is turned off within that time. The number of times the vibration waveform (see Figure 2a) exceeds the detection trigger level TL 1 is measured. This measured number of times is calculated from the start of cutting to the end of the circular saw blade 1.
Since it is continuously measured every rotation period T, by analyzing the arrangement of the numbers, it is possible to distinguish it from excessive vibration at the start of cutting or due to disturbance. Therefore, the counter 7 sends an abnormal signal to the controller 3 when the same number exceeding the detection trigger level TL 1 is continuously measured every rotation period of the circular saw blade.
以上の実施例で説明したように、本発明では丸
鋸刃の異常を鋸刃頭の振動で検出しているが、振
動レベルそものものではなく自動的に設定したレ
ベルを超える振動を鋸刃１回転毎に計測するの
で、外乱の影響を防止でき、信頼性高く鋸刃の異
常を検出できる。又、丸鋸刃の１回転するごと１
つ送出されるパルスにより、計測周期を制御して
いるので、丸鋸刃の回転周期が増減変化しても鋸
刃の異常検出が行なえる。 As explained in the above embodiments, in the present invention, an abnormality in a circular saw blade is detected by the vibration of the saw blade head. Since the measurement is performed every rotation, it is possible to prevent the influence of external disturbances and detect abnormalities in the saw blade with high reliability. Also, for each rotation of the circular saw blade, 1
Since the measurement period is controlled by the pulses sent out, abnormalities in the saw blade can be detected even if the rotation period of the circular saw blade increases or decreases.
なお、上記実施例では、本発明の刃物の異常検
出装置を自動鋸刃交換装置を装備した鋼管切断装
置に応用した場合について述べているが、本発明
は、旋盤、フライス盤等のように刃物を使う工作
機械における鋸刃の異常検知に応用できるのは勿
論である。 In the above embodiment, the case where the abnormality detection device of the blade of the present invention is applied to a steel pipe cutting device equipped with an automatic saw blade changing device is described, but the present invention is applicable to a case where the abnormality detection device of the blade of the present invention is applied to a steel pipe cutting device equipped with an automatic saw blade changing device. Of course, it can also be applied to detect abnormalities in saw blades in machine tools.
以上の説明で明らかなように、本発明によれ
ば、工作機械の振動を検出し、その振動状態によ
つて刃物の異常を推定しているので、刃物の異常
を適確に把握できるという効果がある。 As is clear from the above explanation, according to the present invention, the vibration of the machine tool is detected and the abnormality of the cutter is estimated based on the vibration state, so the effect is that the abnormality of the cutter can be accurately grasped. There is.
第１図は本発明による刃物の異常検出装置の一
実施例の構成を示した斜視図、第２図は第１図の
動作を説明するための信号波形図である。
１……鋸刃頭、１ａ……丸鋸刃、２……鋼管、
３……制御器、４……振動ピツクアツプ、５……
鋸刃回転ピツクアツプ、６……前置増幅器、７…
…計数器。
FIG. 1 is a perspective view showing the configuration of an embodiment of the abnormality detection device for cutlery according to the present invention, and FIG. 2 is a signal waveform diagram for explaining the operation of FIG. 1. 1...Saw blade head, 1a...Circular saw blade, 2...Steel pipe,
3...controller, 4...vibration pickup, 5...
Saw blade rotating pick-up, 6... Preamplifier, 7...
...Counter.
Claims (1)
ことにより工作を行う工作機械における刃物の異
常を検出する装置において、前記工作機械の回転
周期Ｔを検出する第１の検出手段と、前記工作機
械の振動波形を検出する第２の検出手段と、前記
第１及び第２の検出手段の出力を受け、前記刃物
が正常の場合に前記回転周期Ｔ毎に前記切刃の枚
数が前記所定数に等しくなるような基準トリガレ
ベルTL2を基準としてそれより高いレベルの検出
用トリガレベルTL1を自動的に設定するトリガレ
ベル設定手段と、前記第１及び第２の検出手段の
出力を受け、前記回転周期Ｔ毎に前記第２の検出
手段で検出された振動波形が前記検出用トリガレ
ベルTL1を越える回数を計測する計測手段と、該
計測手段で計測された回数を受け、同一回数が前
記回転周期Ｔ毎に連続して計測されたときに異常
信号を発生する異常判定手段とを有してなる刃物
の異常検出装置。1. A device for detecting an abnormality in a cutter in a machine tool that performs work by rotating a cutter having a predetermined number of cutting edges on its outer periphery, comprising: a first detection means for detecting a rotation period T of the machine tool; a second detection means for detecting a vibration waveform of the machine; and a second detection means that receives the outputs of the first and second detection means, and determines that the number of cutting blades is the predetermined number at each rotation period T when the cutter is normal. Trigger level setting means for automatically setting a detection trigger level TL 1 higher than the reference trigger level TL 2 that is equal to , and receiving outputs from the first and second detection means; a measuring means for measuring the number of times the vibration waveform detected by the second detecting means exceeds the detection trigger level TL 1 for each rotation period T; An abnormality detection device for a cutlery, comprising: an abnormality determining means that generates an abnormality signal when measurements are continuously taken at each of the rotation periods T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57230455A JPS59116513A (en) | 1982-12-24 | 1982-12-24 | Abnormality detecting device for blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57230455A JPS59116513A (en) | 1982-12-24 | 1982-12-24 | Abnormality detecting device for blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59116513A JPS59116513A (en) | 1984-07-05 |
| JPH035942B2 true JPH035942B2 (en) | 1991-01-28 |
Family
ID=16908133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57230455A Granted JPS59116513A (en) | 1982-12-24 | 1982-12-24 | Abnormality detecting device for blade |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59116513A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6224909A (en) * | 1985-07-25 | 1987-02-02 | Nippon Kokan Kk <Nkk> | Method for detecting missing of saw tooth in sawing machine |
| CN103909445B (en) * | 2014-04-16 | 2016-05-18 | 徐震 | Band sawing machine auto-adaptive cutting control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5548513A (en) * | 1978-10-03 | 1980-04-07 | Komatsu Ltd | Abnormality detecting method of milling cutter in cutting machine and its abnormality detector |
| JPS5676361A (en) * | 1979-11-14 | 1981-06-23 | Toshiba Corp | Detector of tool failure |
-
1982
- 1982-12-24 JP JP57230455A patent/JPS59116513A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5548513A (en) * | 1978-10-03 | 1980-04-07 | Komatsu Ltd | Abnormality detecting method of milling cutter in cutting machine and its abnormality detector |
| JPS5676361A (en) * | 1979-11-14 | 1981-06-23 | Toshiba Corp | Detector of tool failure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59116513A (en) | 1984-07-05 |
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