JPS59154356A - Detecting circuit of damage of tool - Google Patents

Detecting circuit of damage of tool

Info

Publication number
JPS59154356A
JPS59154356A JP58028523A JP2852383A JPS59154356A JP S59154356 A JPS59154356 A JP S59154356A JP 58028523 A JP58028523 A JP 58028523A JP 2852383 A JP2852383 A JP 2852383A JP S59154356 A JPS59154356 A JP S59154356A
Authority
JP
Japan
Prior art keywords
signal
voltage
tool
circuit
machine tool
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
Application number
JP58028523A
Other languages
Japanese (ja)
Inventor
Yasuhide Onuki
大貫　康英
Minoru Uchibori
内堀　実
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Citizen Holdings Co Ltd
Citizen Watch Co Ltd
Original Assignee
Citizen Holdings Co Ltd
Citizen Watch Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Citizen Holdings Co Ltd, Citizen Watch Co Ltd filed Critical Citizen Holdings Co Ltd
Priority to JP58028523A priority Critical patent/JPS59154356A/en
Priority to US06/576,235 priority patent/US4574633A/en
Priority to DE19843403814 priority patent/DE3403814A1/en
Priority to GB08403059A priority patent/GB2136125B/en
Publication of JPS59154356A publication Critical patent/JPS59154356A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
    • G01H1/003—Measuring characteristics of vibrations in solids by using direct conduction to the detector of rotating machines
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/406—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by monitoring or safety
    • G05B19/4065—Monitoring tool breakage, life or condition
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/37—Measurements
    • G05B2219/37351—Detect vibration, ultrasound
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/37—Measurements
    • G05B2219/37434—Measuring vibration of machine or workpiece or tool

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Automation & Control Theory (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

PURPOSE:To prevent the malfunction of a device by operating an alarm circuit with both of an artificial damage signal of the output of a comparator and a cut feeding signal of a machine tool. CONSTITUTION:A detector 1 for an AE signal is attached to a tool of a machine tool or the like to detect the AE signal in a form of an AC voltage. An amplifier 2 is so set that a degree of amplification between 40db and 80db is attained, and an LC filter 3 has a pass band between 300Hz and 1MHz for the purpose of reducing mechanical oscillation noise, noise from a power source, 1/f noise, or the like. An envelope detector 4 detects the amplified AE signal voltage and converts it to a DC voltage, and this voltage becomes one input signal voltage of a comparator 5. This signal voltage is compared with a preliminarily set discrimination voltage 6 in the comparator 5; and when the signal voltage exceeds the discrimination voltage, an artificial damage signal 11 is outputted, and an alarm circuit 9 is operated only when the signal 11 and the output signal from a control part 8 of an automatic machine tool are inputted to an AND circuit 7 where these signals are ont and the other inputs.

Description

【発明の詳細な説明】 本発明は工作機の工具損傷検知を電気的方法で行なう装
置の誤動作防止に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to preventing malfunction of a device that electrically detects tool damage in a machine tool.

工具損傷に伴なって生ずる物理的変化、例えば■ＡＥ（
アコ−ステイクエミッション）の発生、■振動加速度の
変化、■送り抗力の増加などを電気信号に変換して工具
損傷検出を行なう方法は、変換後の信号処理を電気的に
行なえることから、■検知に用する時間が極めて短（、
はぼ損傷発生と同時に検知できる。■損傷検知が連続的
に行１ｇえる。■電気的な記憶回路との比較によって検
知が台なえる。■検出感度が優れて（・るなどの利点を
持っている。Physical changes that occur with tool damage, such as ■AE (
The method of detecting tool damage by converting the occurrence of (acoustic emission), ■ changes in vibration acceleration, ■ increases in feed drag, etc. into electrical signals is possible because the signal processing after conversion can be performed electrically. The time required for detection is extremely short (,
It can be detected at the same time as the damage occurs. ■Damage detection continues for 1g. ■Detection is compromised by comparison with electrical memory circuits. ■It has advantages such as excellent detection sensitivity.

しかしながら、工具損傷時に発生する信号と類似の電気
的雑音によって、実際に工具損傷が起きていない場合で
も、誤って工具損傷検出回路が動作してしまういわゆる
誤動作が起きる。However, electrical noise similar to the signal generated when a tool is damaged causes a so-called malfunction in which the tool damage detection circuit is erroneously activated even when no tool damage has actually occurred.

これら誤動作の原因として次のようなことが考えられる
。■工作機の早送り動作あるいは被剛材の移動によって
生ずる衝撃や振動など機械的要因による誤った検出出力
の発生。■誘導により検出器に発生する電圧、検出装置
の電源から検出回路への外来雑音の混入、検出装置のス
イッチ類の操作によって生ずる雑音発生などの電気的要
因などがある。Possible causes of these malfunctions are as follows. ■ Occurrence of erroneous detection output due to mechanical factors such as shock and vibration caused by rapid movement of the machine tool or movement of the rigid material. ■Electrical factors include voltage generated in the detector due to induction, external noise entering the detection circuit from the power supply of the detection device, and noise generated by operating switches on the detection device.

電気的要因のうち外来雑音や誘導などは必要に応じてフ
ィルター回路や電気的シ〜、／Ｌドを行なうことによっ
て軽減させることができる。一方、機械的要因は工作機
の動作に基づくものであり、かつ工具損傷と類似の要因
であることから、工作機の機能を低下させず、また検出
感度を低下させることなくこれらの要因を除去すること
が難しい。Among electrical factors, external noise, induction, etc. can be reduced by implementing a filter circuit or electrical shielding, as required. On the other hand, mechanical factors are based on machine tool operation and are similar to tool damage, so these factors can be removed without reducing machine tool functionality or detection sensitivity. difficult to do.

このような要因による工具損傷検出装置の誤動作を防ぐ
ため、本発明は工作機の動作と工具損傷検出とを結びつ
けることによって、上記の機械的要因による誤動作を防
止することを可能にした。In order to prevent malfunctions of the tool damage detection device due to such factors, the present invention makes it possible to prevent malfunctions due to the above-mentioned mechanical factors by linking machine tool operation and tool damage detection.

以下図面を参照にして、」−記目的を達成するための本
発明の詳細な説明する。図に本発明の実施例を示すブロ
ック図を示す。The present invention will now be described in detail with reference to the drawings. The figure shows a block diagram showing an embodiment of the present invention.

図に於て、１はＡ　Ｅ信号の検出子で工作機の１］具あ
るいは刃物台に取り伺けられ、ＡＥ倍信号交流’ＦＴｆ
　Ｉｆ、の形で検出する。２はアンプで４０〜８０　ｄ
ｌ）の間の増幅度を得ることができる。６はＬＣフィル
タで、機械的振動雑音、電源から発生する雑音、さらに
１／ｆ雑音などを軽減させるため３００に〜Ｉ　Ｍ　１
ｉｚの間に通過帯′を持たせである。In the figure, 1 is the detector for the AE signal, which is picked up by the tool or tool rest of the machine tool, and the AE multiplied signal AC'FTf.
If, it is detected in the form. 2 is 40~80d with amplifier
It is possible to obtain an amplification degree between 1) and 1). 6 is an LC filter, which is set to 300~I M 1 in order to reduce mechanical vibration noise, noise generated from the power supply, and 1/f noise.
A pass band' is provided between iz and iz.

４は包絡検波で増幅されたＡＥ信号電圧を検波し、数１
ｌＳｅＣの時定数を持つ積分回路を通過させ、緩慢に変
化する直流電圧に変換する。この電圧は比較器５の一方
の入力信号電圧となる。この信号電圧と、予め設定した
判定電圧６とを比較器５で比較し、信号電圧が判定電圧
を超えた場合に疑似損傷信号１１が出力される。4 detects the AE signal voltage amplified by envelope detection, and formula 1
The voltage is passed through an integrating circuit with a time constant of 1SeC and converted into a slowly changing DC voltage. This voltage becomes one input signal voltage of comparator 5. This signal voltage is compared with a preset determination voltage 6 by a comparator 5, and when the signal voltage exceeds the determination voltage, a pseudo damage signal 11 is output.

従来の方法ではここでただちに警報回路９が動作Ｉ−た
が、本発明では以下に述べるように疑似損傷信号１１を
一方の入力とし、これと自動工作機械の制御部８から出
力される信号とを他の一方の入力とするＡＮＤ回路７を
有し、両者の信号が入力されてはじめて警報回路９を動
作させるものである。工作機の制御部８かも出力される
信号は工作機が切削送り動作を行なっている間、出力さ
れる切削送り信号１２である。In the conventional method, the alarm circuit 9 immediately operates at this point, but in the present invention, as described below, the pseudo damage signal 11 is used as one input, and this and the signal output from the control section 8 of the automatic machine tool are combined. It has an AND circuit 7 which has one input as the other, and operates the alarm circuit 9 only when both signals are input. The signal output from the control section 8 of the machine tool is a cutting feed signal 12 that is output while the machine tool is performing a cutting feed operation.

すなわちＡＮＤ回路７に上記疑似損傷信号１１と切削送
り信号１２の両方が加わった場合に信号が次の警報回路
９に送られ、警報回路９が動作しブリ“−の音あるいは
ランプの発光などで作業者に工具損傷を知らせるととも
に損傷信号１６が出力される。損傷信号１６は自動工作
機械の制御部に入力し、不良工作物の発生を防ぐと共に
、工作機自体を保護するために工作機械を停止させる。That is, when both the above-mentioned pseudo damage signal 11 and cutting feed signal 12 are applied to the AND circuit 7, the signal is sent to the next alarm circuit 9, and the alarm circuit 9 is activated, causing a buzzing sound or a lamp to emit light. A damage signal 16 is output to notify the operator of tool damage.The damage signal 16 is input to the control section of the automatic machine tool to prevent the generation of defective workpieces and to protect the machine tool itself. make it stop.

以１−．のように警報回路９が比較器の出力である疑似
損傷信号１１のみで動作せず、工作機が切削送りを行な
っているという信号即ち切削送り信号１２が加わっては
じめて動作するという工具損傷検出回路によって、工作
機の早送り、あるいは被削拐の移動によって発生ずる損
傷と類似した検出器出力による装置の誤動作を防ぐこと
ができる。Below 1-. A tool damage detection circuit in which the alarm circuit 9 does not operate only with the pseudo damage signal 11 which is the output of the comparator, but operates only when a signal indicating that the machine tool is performing cutting feed, that is, a cutting feed signal 12 is added. This prevents equipment malfunctions due to detector output similar to damage caused by rapid forwarding of the machine tool or movement of the work piece.

また工作機が切削送りを行なっている間に検出装置のス
イッチ類を操作することを行なわなければ、操作による
電気雑音による装置の誤動作を防止することができる。Furthermore, if the switches of the detection device are not operated while the machine tool is feeding cutting, malfunction of the device due to electrical noise caused by the operation can be prevented.

以」二の説明では工具損傷に伴なって発生するＡ　Ｅ信
号を検知する方法を用いて工具損傷検出を行なう方法に
ついて説明したが、ことで説明した誤動作防止のための
回路は他の電気的検出法、例えば、工作機の主軸電動機
の電流の増大を検出する方法、振動加速度を検出する方
法などによる工具損傷検出回路などにも応用できる。In the following explanation, we explained a method for detecting tool damage using a method of detecting the AE signal that occurs due to tool damage. The present invention can also be applied to tool damage detection circuits using detection methods such as a method of detecting an increase in the current of a spindle motor of a machine tool or a method of detecting vibration acceleration.

また切削送り信号を工作機の切削送りの間、出力する場
合について説明しであるが、これは動作の開始と終了時
にそれぞれパルス信号を出力させ、これをフリップフロ
ップ回路などに入力させることによっても同様な動作を
行なうことができる。In addition, we will explain the case where the cutting feed signal is output during the cutting feed of the machine tool, but this can also be done by outputting a pulse signal at the start and end of the operation, and inputting this to a flip-flop circuit etc. A similar operation can be performed.

本実施例ではＡ、　Ｎ　Ｄ回路を用いた場合を示しであ
るが、入力の一方あるいは両方に負論理を用いたＯ　Ｒ
ｌＮ　ＯＲｌＮ　Ａ、　Ｎ　Ｉ）回路を用いることもで
きる。This example shows the case where A and N D circuits are used, but it is also possible to use an OR circuit using negative logic for one or both of the inputs.
It is also possible to use an IN ORIN A, N I) circuit.

【図面の簡単な説明】[Brief explanation of the drawing]

図は本発明の実施例を示すブロック図。 １　・・・検出子、　　２・・・・・アンプ、６・・・
・・・フィルタ、　　４・・・・包絡検波、５・・・・
・比較器、　６　・・・判定電圧、７・・・・・アンド
回路、　８・・・・・自動工作機制御部、９・・・・・
警報回路、　　１１・・・・・・疑似損傷信号、１２・
・・・切削送り信号、 １６！・・・・損傷信号。The figure is a block diagram showing an embodiment of the present invention. 1...detector, 2...amplifier, 6...
...Filter, 4...Envelope detection, 5...
・Comparator, 6... Judgment voltage, 7... AND circuit, 8... Automatic machine tool control section, 9...
Alarm circuit, 11...Pseudo damage signal, 12.
...Cutting feed signal, 16! ...Damage signal.

Claims (2)

【特許請求の範囲】[Claims] （１）工作機の工具損傷検知を電気信号を用いて行なう
工具損傷検出装置において、工具損傷を電気的に検出す
る工具損傷検出信号と工作機の制御回路からの信号とを
結合させるＡＮＤ回路を有し、該Ａ、　Ｎ　０回路の出
力により警報回路を作動させる信号と工具損傷信号とを
出力させることにより工具損傷検出装置の誤動作を防止
することを特徴とした工具損傷検出回路。(1) A tool damage detection device that uses electrical signals to detect tool damage in a machine tool includes an AND circuit that combines a tool damage detection signal that electrically detects tool damage with a signal from the control circuit of the machine tool. A tool damage detection circuit comprising: a tool damage detection circuit which prevents malfunction of a tool damage detection device by outputting a signal for activating an alarm circuit and a tool damage signal by the output of the A, N0 circuit. （２）工作機の制御回路は工作機の切削送りを開始した
ことと、これが終了したことを出力し、これを上記ＡＮ
Ｄ回路に加えることを特徴とする工具損傷検出回路。(2) The control circuit of the machine tool outputs that the cutting feed of the machine tool has started and that it has finished, and these are sent to the above AN.
A tool damage detection circuit characterized by being added to the D circuit.
JP58028523A 1983-02-04 1983-02-24 Detecting circuit of damage of tool Pending JPS59154356A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP58028523A JPS59154356A (en) 1983-02-24 1983-02-24 Detecting circuit of damage of tool
US06/576,235 US4574633A (en) 1983-02-04 1984-02-02 Apparatus for detecting tool damage in automatically controlled machine tool
DE19843403814 DE3403814A1 (en) 1983-02-04 1984-02-03 DETECTING DEVICE FOR TOOL DAMAGE IN AUTOMATICALLY CONTROLLED MACHINE TOOLS
GB08403059A GB2136125B (en) 1983-02-04 1984-02-06 Detecting tool damage in automatically controlled machine tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58028523A JPS59154356A (en) 1983-02-24 1983-02-24 Detecting circuit of damage of tool

Publications (1)

Publication Number Publication Date
JPS59154356A true JPS59154356A (en) 1984-09-03

Family

ID=12251025

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58028523A Pending JPS59154356A (en) 1983-02-04 1983-02-24 Detecting circuit of damage of tool

Country Status (1)

Country Link
JP (1) JPS59154356A (en)

Similar Documents

Publication Publication Date Title
US4574633A (en) Apparatus for detecting tool damage in automatically controlled machine tool
JPS61159354A (en) Method of discriminating actual machining and no-load machining and device thereof
JPS59154356A (en) Detecting circuit of damage of tool
US3590670A (en) Machine tool cutting indication and control
JPS59166448A (en) Machine tool under adaptive numerical control
JPS57172218A (en) Detector for tool defect
JPS5720625A (en) Detection of tool chipping
JPS5473562A (en) Wire bonding device
JP2021044639A (en) Work noise detection device
JPS59142050A (en) Damage detector for tool
KR100204364B1 (en) Tool breakage detection device for a machine tool
JPS61164760A (en) Detecting method of tool breakage
JPH02190239A (en) Drill abnormality detecting device for borer for printed wiring board
JPS5820743B2 (en) Tool abnormality detection method for machine tools
JPS6232070B2 (en)
JPS5537274A (en) Feed controller of machine tool
JPS60255354A (en) Tool-breakage detector
SU1084673A1 (en) Acoustic emission device for object technological condition diagnostics
JPS61187654A (en) Apparatus for detecting abrasion of tool
JPS6135353A (en) Detecting device for tool breaking
JPS6144622B2 (en)
SU789741A1 (en) Apparatus for signal processing to ultrasonic defectoscope
JPS6195856A (en) Machine tool control device having machining condition sensing function
JPH0558856B2 (en)
JPS55131414A (en) Multispindle boring machine system