JPH0310466B2 - - Google Patents
Info
- Publication number
- JPH0310466B2 JPH0310466B2 JP59205779A JP20577984A JPH0310466B2 JP H0310466 B2 JPH0310466 B2 JP H0310466B2 JP 59205779 A JP59205779 A JP 59205779A JP 20577984 A JP20577984 A JP 20577984A JP H0310466 B2 JPH0310466 B2 JP H0310466B2
- Authority
- JP
- Japan
- Prior art keywords
- control
- servo motor
- power
- power outage
- circuit
- 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
- 238000001514 detection method Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims 1
- 238000003754 machining Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/25—Movable or adjustable work or tool supports
- B23Q1/64—Movable or adjustable work or tool supports characterised by the purpose of the movement
- B23Q1/68—Movable or adjustable work or tool supports characterised by the purpose of the movement for withdrawing tool or work during reverse movement
-
- 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
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、数値制御装置（NC）などの工作機
械の制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a machine tool such as a numerical control device (NC).
一般に、サーボモータ駆動回路でサーボモータ
を駆動し、さらにこのサーボモータで制御軸を駆
動して被加工物を加工する工作機械においては、
制御軸の停止状態、移動状態、加工のための移動
状態において装置電源の瞬時停電が発生した場
合、サーボモータ駆動回路またはサーボモータ駆
動回路を制御している制御装置の停電検知回路に
よつて瞬時停電を検知し、サーボモータに発電制
動などの電気的制動と機械的制動をかけて制御軸
の駆動を停止させるようにしている。
Generally, in machine tools that drive a servo motor with a servo motor drive circuit and further drive a control axis with this servo motor to machine the workpiece,
If a momentary power failure occurs in the equipment power supply while the control axis is stopped, moving, or moving for machining, the servo motor drive circuit or the power failure detection circuit of the control device controlling the servo motor drive circuit will instantly shut down the power supply. The system detects a power outage and applies electrical and mechanical braking, such as dynamic braking, to the servo motor to stop driving the control shaft.
ところが、瞬時停電を検知してから制御軸を停
止させるまで一定の遅れ時間があるため、この間
に制御軸が惰走し、被加工物と加工工具とが衝突
したりして被加工物に損傷を与えてしまうという
問題点があつた。
However, since there is a certain delay time from when a momentary power outage is detected until the control axis is stopped, the control axis coasts during this time, causing damage to the workpiece due to collision between the workpiece and the processing tool. There was a problem that it gave .
本発明は、サーボモータ等の駆動源を制御する
制御装置の停電検知回路とは別に新たな停電検知
手段を設け、さらにこの停電検知手段の検知出力
により被加工物と加工工具とを隔離する方向に制
御軸を駆動させる駆動指令を発生する駆動指令発
生回路を設けたものである。
The present invention provides a new power outage detection means separate from a power outage detection circuit of a control device that controls a drive source such as a servo motor, and further provides a direction for isolating a workpiece and a machining tool based on the detection output of this power outage detection means. A drive command generation circuit is provided to generate a drive command to drive the control axis.
停電検知により被加工物と加工工具とが隔離さ
れる方向に駆動され、制御軸の惰走による被加工
物の損傷が防止される。
Upon detection of a power outage, the workpiece and processing tool are driven in a direction that separates them, thereby preventing damage to the workpiece due to coasting of the control shaft.
以下、実施例により本発明を説明する。 The present invention will be explained below with reference to Examples.
第１図は本発明の一実施例を示すブロツク図で
あり、工作機械の制御系は工作機械制御装置１、
サーボモータ駆動回路２、サーボモータ３、速度
発電機４で構成され、制御装置１から発せられた
サーボモータ３の現在速度との偏差が求められた
後サーボモータ駆動装置２に入力される。これに
より、サーボモータ駆動装置２は制御装置１から
発せられた駆動指令に対応した速度になるように
サーボモータ３を駆動する。 FIG. 1 is a block diagram showing one embodiment of the present invention, in which the control system of a machine tool includes a machine tool control device 1,
It is composed of a servo motor drive circuit 2, a servo motor 3, and a speed generator 4, and after the deviation from the current speed of the servo motor 3 issued from the control device 1 is determined, it is input to the servo motor drive device 2. As a result, the servo motor drive device 2 drives the servo motor 3 at a speed corresponding to the drive command issued from the control device 1.
一方、これらの制御系の電源５の停電時に、サ
ーボモータ３の回転軸に結合された制御軸（図示
せず）を被加工物と加工工具とを隔離する方向に
制御する本発明に関わる制御系は、停電検知回路
６、駆動指令発生回路７、駆動方向設定回路８、
電磁接触器遅延回路９とから構成されている。 On the other hand, when the power supply 5 of these control systems is out of power, the control according to the present invention controls a control shaft (not shown) coupled to the rotating shaft of the servo motor 3 in a direction that isolates the workpiece and the processing tool. The system includes a power failure detection circuit 6, a drive command generation circuit 7, a drive direction setting circuit 8,
It is composed of an electromagnetic contactor delay circuit 9.
ここで、電源５が停電すると、その電源波形は
第２図ａに示すように時刻tpにおいて零となり、
工作機械の制御系を作動させるための直流電圧波
形は第２図ｂに示すように時刻tpから順次低下し
て零になる。制御装置１またはサーボモータ駆動
回路２に内蔵された停電検知回路は、第２図ｂの
検知レベルＡで電源５の停電を検知するように検
知感度が設定されている。一方、新たに設けた停
電検知回路６は、第２図ｂの検知レベルＢで電源
５の停電を上記内蔵の停電検知回路より早いタイ
ミングで検知するように検知感度が設定されてい
る。従つて、停電発生時には上記内蔵の停電検知
回路からは第２図ｃに示す時刻t2のタイミングで
停電検知信号が発生されるが、新たに設けた停電
検知回路６からは第２図ｄに示すように時刻t1の
タイミングで停電検知信号が発生される。 Here, when the power supply 5 has a power outage, the power supply waveform becomes zero at time tp as shown in FIG. 2a,
The DC voltage waveform for operating the control system of the machine tool gradually decreases to zero from time tp , as shown in FIG. 2b. The detection sensitivity of the power failure detection circuit built into the control device 1 or the servo motor drive circuit 2 is set so as to detect a power failure of the power source 5 at the detection level A shown in FIG. 2b. On the other hand, the detection sensitivity of the newly provided power failure detection circuit 6 is set so as to detect a power failure of the power supply 5 at the detection level B shown in FIG. 2b at an earlier timing than the built-in power failure detection circuit. Therefore, when a power outage occurs, the built-in power outage detection circuit generates a power outage detection signal at time t2 shown in FIG. As shown, a power outage detection signal is generated at time t1 .
この停電検知回路６から発生された停電検知信
号は駆動指令発生回路７と電磁接触遅延回路９に
入力される。すると、駆動指令発生回路７は駆動
方向設定回路８で設定された方向にサーボモータ
３を駆動するための駆動指令を発生する。この駆
動指令は第２図ｅに示すように時刻t1からt2まで
の間発生される。そして、この駆動指令は制御装
置１と駆動指令と共にサーボモータ駆動回路２に
入力される。 The power failure detection signal generated from the power failure detection circuit 6 is input to the drive command generation circuit 7 and the electromagnetic contact delay circuit 9. Then, the drive command generation circuit 7 generates a drive command for driving the servo motor 3 in the direction set by the drive direction setting circuit 8. This drive command is generated from time t 1 to time t 2 as shown in FIG. 2e. This drive command is input to the servo motor drive circuit 2 together with the control device 1 and the drive command.
一方、遅延回路９は停電検知信号の発生により
駆動指令発生回路７の駆動指令が発生されている
間この駆動指令をサーボモータ駆動回路２の電磁
接触器１０に保持させる信号を発生する。すなわ
ち、遅延回路７は第２図ｆに示すような信号を発
生する。 On the other hand, the delay circuit 9 generates a signal that causes the electromagnetic contactor 10 of the servo motor drive circuit 2 to hold the drive command while the drive command is being generated by the drive command generation circuit 7 due to the generation of the power failure detection signal. That is, the delay circuit 7 generates a signal as shown in FIG. 2f.
これにより、サーボモータ駆動回路２は時刻t1
からt2までの間、駆動方向設定回路８で設定され
た方向にサーボモータ３を駆動する。従つて、駆
動方向設定回路８で設定するサーボモータ３の駆
動方向を加工工具と被加工物とが隔離する方向に
設定しておけば、停電発生時には加工工具と被加
工物とは隔離する方向に瞬時に移動され、従来の
ような制御軸の惰走による損傷を未然に防止する
ことができる。 As a result, the servo motor drive circuit 2 operates at time t 1
to t2 , the servo motor 3 is driven in the direction set by the drive direction setting circuit 8. Therefore, if the drive direction of the servo motor 3, which is set by the drive direction setting circuit 8, is set in a direction that separates the machining tool and the workpiece, the machining tool and the workpiece will be isolated in the event of a power outage. This prevents the control shaft from being damaged by coasting, which is the case in the past.
この場合、制御装置１を除く回路系は停電時は
外部に設けた直流電源またはサーボモータ駆動回
路２内のコンデンサに蓄えられた電力で作動す
る。 In this case, the circuit system other than the control device 1 operates using an external DC power source or electric power stored in a capacitor in the servo motor drive circuit 2 during a power outage.
なお、本発明に係わる回路６〜９は工作機械制
御装置１に内蔵させて構成してもよい。 Note that the circuits 6 to 9 according to the present invention may be built into the machine tool control device 1.
以上の説明から明らかなように本発明によれ
ば、停電発生時には加工工具と被加工物とを隔離
する方向に制御軸を駆動するため、加工工具と被
加工物との衝突等による損傷を防止することがで
きる。特に、加工工具と被加工物とが自重により
接触するような構造の工作機械では、カウンタバ
ランスや減速機等を用いた落下防止機構を必要と
するが、本発明を適用すればこのような機構を設
けなくても済み、機構的な構成を簡単にすること
ができる等の効果がある。
As is clear from the above description, according to the present invention, when a power outage occurs, the control shaft is driven in a direction that isolates the machining tool and the workpiece, thereby preventing damage caused by collision between the machining tool and the workpiece. can do. In particular, machine tools that have a structure in which the machining tool and the workpiece come into contact due to their own weight require a fall prevention mechanism using a counterbalance, a reduction gear, etc., but if the present invention is applied, such a mechanism can be used. It is not necessary to provide the same, and the mechanical configuration can be simplified.
第１図は本発明の一実施例を示すブロツク図、
第２図は動作を説明するための波形図である。
２…サーボモータ駆動回路、３…サーボモー
タ、５…電源、６…停電検知回路、７…駆動指令
発生回路、８…駆動方向設定回路。
FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a waveform diagram for explaining the operation. 2... Servo motor drive circuit, 3... Servo motor, 5... Power supply, 6... Power failure detection circuit, 7... Drive command generation circuit, 8... Drive direction setting circuit.
Claims (1)
対する制御指令を発生し、サーボモータによる該
制御指令に応じた制御軸の駆動に基づいて被加工
物を加工する工作機械の制御装置において、 前記装置電源の停電に伴つて過渡的に降下する
直流制御電圧が前記サーボモータの動作可能限界
電圧である第１の電圧レベルに低下したとき、こ
の旨検知する第１の停電検知手段と、 同じく装置電源の停電に伴つて過渡的に降下す
る直流制御電圧が前記第１の電圧レベルよりも高
い第２の電圧レベルに低下したとき、この旨検知
する第２の停電検知手段と、 前記第２の停電検知手段による検知時から前記
第１の停電検知手段による検知時までの間、前記
制御指令として、被加工物と加工工具とを離隔す
る方向に制御軸を駆動せしめる指令を前記サーボ
モータに与え、この間の前記直流制御電圧の残存
電圧を利用して同サーボモータをこの指令方向に
駆動する停電制御手段と、 を具えた工作機械の制御装置。[Claims of Claims] 1. A control device for a machine tool that generates a control command to a servo motor based on power supplied from a device power supply and processes a workpiece based on driving of a control axis by the servo motor in accordance with the control command. a first power outage detection means that detects when the DC control voltage that transiently drops due to a power outage of the device falls to a first voltage level that is the operating limit voltage of the servo motor; , a second power outage detection means for detecting when the DC control voltage, which also transiently drops due to a power outage of the device, falls to a second voltage level higher than the first voltage level; Between the time of detection by the second power failure detection means and the time of detection by the first power failure detection means, the control command is a command to drive the control shaft in a direction that separates the workpiece from the processing tool. A control device for a machine tool, comprising: a power outage control means that is applied to a motor and drives the servo motor in the commanded direction using residual voltage of the DC control voltage during this time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20577984A JPS6186160A (en) | 1984-10-01 | 1984-10-01 | Control device of machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20577984A JPS6186160A (en) | 1984-10-01 | 1984-10-01 | Control device of machine tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6186160A JPS6186160A (en) | 1986-05-01 |
| JPH0310466B2 true JPH0310466B2 (en) | 1991-02-13 |
Family
ID=16512528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20577984A Granted JPS6186160A (en) | 1984-10-01 | 1984-10-01 | Control device of machine tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6186160A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4737703B2 (en) * | 2008-08-07 | 2011-08-03 | 日本洗浄機株式会社 | Dishwasher |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5028079A (en) * | 1973-07-17 | 1975-03-22 |
-
1984
- 1984-10-01 JP JP20577984A patent/JPS6186160A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5028079A (en) * | 1973-07-17 | 1975-03-22 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6186160A (en) | 1986-05-01 |
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