JPS60255354A - Tool-breakage detector - Google Patents
Tool-breakage detectorInfo
- Publication number
- JPS60255354A JPS60255354A JP11056384A JP11056384A JPS60255354A JP S60255354 A JPS60255354 A JP S60255354A JP 11056384 A JP11056384 A JP 11056384A JP 11056384 A JP11056384 A JP 11056384A JP S60255354 A JPS60255354 A JP S60255354A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- tool
- sensor
- breakage
- output
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/09—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool
- B23Q17/0904—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool before or after machining
- B23Q17/0919—Arrangements for measuring or adjusting cutting-tool geometry in presetting devices
- B23Q17/0947—Monitoring devices for measuring cutting angles
Abstract
Description
【発明の詳細な説明】
発明の分野
本発明は工作機械における工具の折損を折損時に発生す
るアコーステイソン！エミッション（以下ＡＥという）
を利用して検出する工具折損検出装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention is directed to an acoustaining process that occurs when a tool breaks in a machine tool. Emission (hereinafter referred to as AE)
This invention relates to a tool breakage detection device that detects tool breakage using.
従来技術とその問題点
工作機械、例えばボール盤等は自動運転させることが多
いが、ボール盤のドリルの刃が折損することがしばしば
あり、そのような場合には何らかの方法で折損を検出す
る必要がある。こうした工作機械の工具の折損を検出す
る一手法として、従来より工作機械の工具やワークの近
傍にＡＥセンサを設け、そこから得られるＡＥ倍信号基
づいて工具の折損を検出している。Conventional technology and its problems Machine tools, such as drilling machines, are often operated automatically, but the drill bit of the drilling machine often breaks, and in such cases, it is necessary to detect the breakage in some way. . As one method for detecting tool breakage of such a machine tool, an AE sensor is conventionally provided near the tool or workpiece of the machine tool, and tool breakage is detected based on the AE multiplied signal obtained from the AE sensor.
ところで従来の工具折損検出装置に用いられているＡＥ
センサは、例えば第３図に示すようにＩＫＨｚからＩＭ
Ｈｚ程度の広帯域のＡＥ倍信号検出するＡＥセンサが用
いられている。そしてこうした広帯域の周波数特性とす
るためにセン号自体の増幅度か低く微弱なＡＥ倍信号か
得ることができず、ＡＥセン号出出力増幅しなければな
らないという問題点があった。しかるに工具の折損時に
得られるＡＥ倍信号２００ Ｋ Ｈｚ程度にピークを有
しており、摩擦や他の原因によって得られるＡＥ倍信号
工具の折損時のＡＥ倍信号を識別するためにＡＥセンサ
から得られる出力をバンドパスフィルタを介して折損信
号を分離し、コンパレータによってレベル比較する必要
があって、複雑な構造になるという問題点があった。By the way, the AE used in the conventional tool breakage detection device
The sensor can, for example, vary from IKHz to IM as shown in FIG.
An AE sensor that detects a broadband AE multiplied signal on the order of Hz is used. In order to obtain such a wideband frequency characteristic, the amplification degree of the sen signal itself is low and a weak AE multiplied signal cannot be obtained, and the output of the AE sen signal must be amplified. However, the AE multiplied signal obtained when a tool breaks has a peak at about 200 KHz, and the AE multiplied signal obtained from friction and other causes is obtained from the AE sensor in order to identify the AE multiplied signal obtained when a tool breaks. The problem is that it is necessary to separate the broken signal from the generated output through a band-pass filter and compare the levels with a comparator, resulting in a complicated structure.
発明の目的
本発明はこのような従来の工具折損検出装置の問題点に
鑑みてなされたものであって、工具の折損に対応した周
波数特性を有するＡＥセンサを用いることによって簡単
な構造とし、ＳＮ比の良い信号を得ることができる工具
折損検出装置を提供することを目的とする。Purpose of the Invention The present invention has been made in view of the problems of the conventional tool breakage detection device, and has a simple structure by using an AE sensor having frequency characteristics corresponding to tool breakage. It is an object of the present invention to provide a tool breakage detection device that can obtain signals with a good ratio.
発明の構成と効果
本発明は工作機械における工具の折損をＡＥ倍信号より
検出する工具折損検出装置であって、工作機械の工具近
傍に設けられ工具折損時のＡＥ倍信号周波数を含む範囲
のＡＥ倍信号電気信号に変換するＡＥセンサと、ＡＥセ
ンサの出力を増幅する増幅器と、増幅器及び基準電圧信
号が与えられ増幅器の出力が基準電圧レベルを越えると
きに出力を出す比較回路と、を具備することを特徴とす
るものである。Structure and Effects of the Invention The present invention is a tool breakage detection device for detecting tool breakage in a machine tool from an AE multiplied signal, which is provided near the tool of the machine tool and detects an AE multiplied signal frequency in a range including the AE multiplied signal frequency at the time of tool breakage. It includes an AE sensor that converts into a double signal electric signal, an amplifier that amplifies the output of the AE sensor, and a comparison circuit that outputs an output when the amplifier and a reference voltage signal are applied and the output of the amplifier exceeds the reference voltage level. It is characterized by this.
このような特徴を有する本発明によれば、ＡＥセン号自
体の周波数特性によって工具の折損時に発生する周波数
のＡＥ倍信号ＡＥセンサから得られるため、バンドパス
フィルタ等を用いる必要はなくその出力をそのまま増幅
することによって所定のスレッシュホールドレベルと比
較するこ六ができる。従って構造が簡単となりしかもＡ
Ｅセンサの共振点から信号を得ることができるため、感
度が高く雑音等の影響を受け難い工具折損検出装置とす
ることが可能である。According to the present invention having such characteristics, since the AE multiplied signal of the frequency generated when a tool breaks due to the frequency characteristics of the AE sensor itself is obtained from the AE sensor, there is no need to use a bandpass filter or the like, and its output can be By directly amplifying the signal, it is possible to compare it with a predetermined threshold level. Therefore, the structure is simple and A
Since a signal can be obtained from the resonance point of the E-sensor, it is possible to provide a tool breakage detection device that has high sensitivity and is less susceptible to noise and the like.
実施例の説明
第１図は本発明による工具折損検出装置の一実施例を示
すブロック図である。本図においてワーク１はボール盤
のベース上に固定されており、ワーク１の上部よりドリ
ル２を回転させて所定速度で押下しワーク１に開口を設
ける。このとき例えばワーク１が配置されるベース上に
ＡＥセンサ３を固定しておく。ＡＥセンサ３は第２図に
示すように工具、この場合にはドリルの折損時に得られ
るＡＥ倍信号周波数である１００〜３００ＫＨｚにピー
クを有する周波数特性のセンサを用いるものとする。Ａ
Ｅセンサ３はこの範囲の周波数を電気信号に変換して増
幅器４に与える。増幅器４は可変抵抗器５の調整により
増幅率を任意に設定することができる増幅器であって、
その増幅出力を比較器６に与えるものである。比較器６
の他方の入力端には基準電源Ｖｃｃを分圧した所定のス
レッシュホールドレベルか設定されている。比較器６は
、増幅器４よりスレッシュホールドレベル以上の入力信
号が与えられたときに工具の折損信号を折損表示器７に
与えるものである。又増幅器４の出力ば表示器駆動用の
増幅器８を介してＡＥ信号表示器９に接続されている。DESCRIPTION OF EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of a tool breakage detection device according to the present invention. In this figure, a workpiece 1 is fixed on the base of a drilling machine, and a drill 2 is rotated from above the workpiece 1 and pushed down at a predetermined speed to form an opening in the workpiece 1. At this time, for example, the AE sensor 3 is fixed on a base on which the work 1 is placed. As shown in FIG. 2, the AE sensor 3 is a sensor having a frequency characteristic having a peak at 100 to 300 KHz, which is the AE multiplied signal frequency obtained when a tool, in this case a drill, breaks. A
The E-sensor 3 converts frequencies in this range into electrical signals and provides them to the amplifier 4. The amplifier 4 is an amplifier whose amplification factor can be arbitrarily set by adjusting the variable resistor 5,
The amplified output is given to the comparator 6. Comparator 6
A predetermined threshold level obtained by dividing the reference power supply Vcc is set at the other input terminal of the power supply. The comparator 6 provides a tool breakage signal to the breakage indicator 7 when an input signal of a threshold level or higher is applied from the amplifier 4. The output of the amplifier 4 is also connected to an AE signal display 9 via an amplifier 8 for driving a display.
ＡＥ信号表示器９はボール盤の動作時に増幅器４より与
えられるＡＥ信号レしルを常に表示するものである。The AE signal display 9 always displays the AE signal level given by the amplifier 4 during operation of the drilling machine.
このように構成された本発明の工具折損検出装置を工作
機械、この場合はボール盤に設置してボール盤を動作さ
せれば、切削時の摩擦や切屑によってワーク１とドリル
２より、ＡＥ倍信号生じる。If the tool breakage detection device of the present invention configured as described above is installed in a machine tool, in this case a drilling machine, and the drilling machine is operated, an AE multiplied signal will be generated from the workpiece 1 and the drill 2 due to friction and chips during cutting. .
しかしＡＥセンサ３自体の周波数特性によってほとんど
電気信号に変換されない。従ってＡＥ信号表示器９の表
示は低いレベルにとどまることとなる。しかし、工具が
折損した時には周波数のＡＥ倍信号周波数はＡＥセン号
３の周波数特性と一致しているため、ＡＥセンサ３によ
って電気信号に変換されて増幅器４を介して比較器６に
与えられる。従って比較器６によってＡＥ倍信号レベル
をスレッシュホールドレベルと比較することによって摩
擦等の他の原因のＡＥ倍信号影響を少なくして工具の折
損を折損表示器７に表示させることが可能となる。However, due to the frequency characteristics of the AE sensor 3 itself, it is hardly converted into an electrical signal. Therefore, the display on the AE signal display 9 remains at a low level. However, when the tool breaks, the AE multiplied signal frequency matches the frequency characteristics of the AE sensor signal 3, so it is converted into an electrical signal by the AE sensor 3 and provided to the comparator 6 via the amplifier 4. Therefore, by comparing the AE multiplied signal level with the threshold level by the comparator 6, it is possible to reduce the influence of other causes such as friction on the AE multiplied signal, and to display tool breakage on the breakage indicator 7.
尚本実施例はボール盤のドリル折損検出装置について説
明しているが、本発明は他の工作機械、例えば旋盤やフ
ライス盤等の種々の工作機械に適用することか可能であ
る。Although this embodiment describes a drill breakage detection device for a drilling machine, the present invention can be applied to other machine tools, such as various machine tools such as lathes and milling machines.
第１図は本発明による工具折損検出装置の−実絶倒を示
すブロック図、第２図は従来の工具折損検知装置に用い
られるＡＥセンサの周波数特性を示す図、第３図は本発
明によるＡＥセンサ３の周波数特性の一例を示すグラフ
である。
１−−−一−−〜ワーク ２−−−−−ドリル ３−−
−−−−Ａ Ｅセンサ ４−−−−−−一増幅器 ５−
−−−−−可変抵抗器６−−−−一比較器 ７−−一−
−−−折損表示器 ８−−−−一増幅器 ９−−−−−
Ａ Ｅ信号表示器
特許出願人 立石電機株式会社
代理人 弁理士 岡本官喜（他１名）
第１図Fig. 1 is a block diagram showing the actual failure of the tool breakage detection device according to the present invention, Fig. 2 is a diagram showing the frequency characteristics of the AE sensor used in the conventional tool breakage detection device, and Fig. 3 is a diagram showing the frequency characteristics of the AE sensor used in the conventional tool breakage detection device. 3 is a graph showing an example of frequency characteristics of the AE sensor 3. FIG. 1---1---Work 2------Drill 3---
-----A E sensor 4-------1 amplifier 5-
--- Variable resistor 6 --- Comparator 7 ---
---Broken indicator 8-----One amplifier 9-----
A E signal display patent applicant Tateishi Electric Co., Ltd. agent Patent attorney Kanki Okamoto (and one other person) Figure 1
Claims (2)
倍信号周波数を含む範囲のＡＥ倍信号電気信号に変換す
るＡＥセン号と、 前記ＡＥセンサの出力を増幅する増幅器と、前記増幅器
及び基準電圧信号が与えられ増幅器の出力が基準電圧レ
ヘルを越えるときに出力を出す比較回路と、を具備する
ことを特徴とする工具折損検出装置。(1) AE installed near the tool of a machine tool when the tool breaks
an AE sensor for converting into an AE multiplied signal electric signal in a range including the multiplied signal frequency; an amplifier for amplifying the output of the AE sensor; and when the amplifier and the reference voltage signal are applied and the output of the amplifier exceeds the reference voltage level. A tool breakage detection device comprising: a comparison circuit that outputs an output.
の周波数にピークを有するＡＥセンサであることを特徴
とする特許請求の範囲第１項記載の工具折損検出装置。(2) The tool breakage detection device according to claim 1, wherein the AE sensor is an AE sensor having a peak at a frequency in the range of 100 to 300 KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11056384A JPS60255354A (en) | 1984-05-29 | 1984-05-29 | Tool-breakage detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11056384A JPS60255354A (en) | 1984-05-29 | 1984-05-29 | Tool-breakage detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60255354A true JPS60255354A (en) | 1985-12-17 |
Family
ID=14539000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11056384A Pending JPS60255354A (en) | 1984-05-29 | 1984-05-29 | Tool-breakage detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60255354A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101058233B1 (en) | 2008-12-09 | 2011-08-22 | 주식회사 진영엠에스씨 | Tool breakage detection method and detection device for machine tools |
| CN105563234A (en) * | 2016-01-22 | 2016-05-11 | 浙江大学台州研究院 | Twist drill abrasion monitoring method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55106751A (en) * | 1979-01-31 | 1980-08-15 | Yoshiaki Kakino | Tool damage detector |
-
1984
- 1984-05-29 JP JP11056384A patent/JPS60255354A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55106751A (en) * | 1979-01-31 | 1980-08-15 | Yoshiaki Kakino | Tool damage detector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101058233B1 (en) | 2008-12-09 | 2011-08-22 | 주식회사 진영엠에스씨 | Tool breakage detection method and detection device for machine tools |
| CN105563234A (en) * | 2016-01-22 | 2016-05-11 | 浙江大学台州研究院 | Twist drill abrasion monitoring method |
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