JP3537157B2 - Electrode feeder for electric discharge machining - Google Patents
Electrode feeder for electric discharge machiningInfo
- Publication number
- JP3537157B2 JP3537157B2 JP16142093A JP16142093A JP3537157B2 JP 3537157 B2 JP3537157 B2 JP 3537157B2 JP 16142093 A JP16142093 A JP 16142093A JP 16142093 A JP16142093 A JP 16142093A JP 3537157 B2 JP3537157 B2 JP 3537157B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- piezoelectric element
- electric discharge
- discharge machining
- guide member
- 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
Landscapes
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、放電加工用電極送り装
置に関するもので、特に、圧電素子の伸縮を利用して電
極のみを送り出す機能を有する電極送り装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode feeder for electric discharge machining, and more particularly to an electrode feeder having a function of sending out only an electrode by using expansion and contraction of a piezoelectric element.
【０００２】[0002]
【従来の技術】従来より、高応答な電極送り特性を実現
するため、サーボモータを利用した放電加工機が知られ
ている。また、圧電素子の伸縮を利用して電極を移動さ
せ、電極をワークに近接させて放電加工させる放電加工
機の電極送り装置として、特開平３−７９２３７号公報
に示されているものが知られている。2. Description of the Related Art Conventionally, there has been known an electric discharge machine utilizing a servomotor in order to realize a highly responsive electrode feed characteristic. Further, as an electrode feeder of an electric discharge machine for performing electric discharge machining by moving an electrode by using expansion and contraction of a piezoelectric element and bringing the electrode close to a work, one disclosed in JP-A-3-79237 is known. ing.
【０００３】特開平３−７９２３７号公報に示されてい
るものでは、電圧の印加により伸縮する歪素子の一端に
移動体を固定し、歪素子の他端に慣性体を固定し、この
移動体で加工電極を保持し、歪素子が伸縮するときの慣
性体に働く慣性力を利用して加工電極を移動させて被加
工物の加工を行っている。In Japanese Unexamined Patent Publication No. 3-79237, a moving body is fixed to one end of a strain element which expands and contracts by applying a voltage, and an inertial body is fixed to the other end of the strain element. The workpiece is processed by moving the processing electrode by using the inertial force acting on the inertial body when the strain element expands and contracts.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、サーボ
モータを利用したものではサーボモータによる電極駆動
部が大きくなり、装置が大きくなるという問題がある。
特開平３−７９２３７号公報に示される放電加工機で
は、歪素子の一端に固定される移動体で加工電極を保持
するため、加工による電極消耗に応じて加工電極を頻繁
に交換する必要がある。さらに、移動体、加工電極およ
び慣性体が一体となって送り戻し動作を行うため移動す
る部材の総重量が大きくなり、印加電圧に対する装置の
応答性が低下するという問題がある。However, in the case of using a servomotor, there is a problem that an electrode driving section by the servomotor becomes large and the device becomes large.
In the electric discharge machine disclosed in Japanese Patent Application Laid-Open No. 3-79237, the machining electrode is held by a movable body fixed to one end of the strain element. Therefore, it is necessary to frequently exchange the machining electrode in accordance with electrode consumption due to machining. . Furthermore, since the moving body, the processing electrode, and the inertial body perform the feed-back operation integrally, there is a problem that the total weight of the moving member increases and the responsiveness of the apparatus to the applied voltage decreases.
【０００５】本発明はこのような問題点を解決するため
になされたもので、電極のみの送り戻しが可能で、電極
の連続使用が可能で、加工応答性の良い小型化可能な放
電加工用電極送り装置を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is possible to reduce the size of the electric discharge machining which can return only the electrode, can continuously use the electrode, and has a good machining response. It is an object to provide an electrode feeding device.
【０００６】[0006]
【課題を解決するための手段】前記課題を解決するため
の本発明の放電加工用電極送り装置は、伸縮可能な積層
型の圧電素子と、前記圧電素子の自由端に固定され、摩
擦接触により電極を移動する案内部材と、前記案内部材
に前記電極を押圧する付勢手段と、前記電極の進行方向
に緩慢な速度で前記圧電素子を伸長または収縮させる第
１の動作と前記電極の反進行方向に急速な速度で前記圧
電素子を収縮または伸長させる第２の動作とを繰り返す
ように、前記圧電素子に印加する電圧を制御する制御手
段とを備えたことを特徴とする。According to a first aspect of the present invention, there is provided an electrode feeding apparatus for electric discharge machining, which comprises a stackable piezoelectric element which can be extended and contracted, and which is fixed to a free end of the piezoelectric element by frictional contact. A guide member for moving the electrode, an urging means for pressing the electrode against the guide member, a first operation for extending or contracting the piezoelectric element at a slow speed in the direction of movement of the electrode, and a counter-movement of the electrode Control means for controlling a voltage applied to the piezoelectric element so as to repeat a second operation of contracting or expanding the piezoelectric element at a rapid speed in a direction.
【０００７】[0007]
【作用】本発明の放電加工用電極送り装置によれば、電
極の送り時または戻し時、緩慢な速度で電極の進行方向
に圧電素子を伸長または収縮し、電極と案内部材間の摩
擦力により電極を進行方向に移動する。電極の反進行方
向に急速な速度で圧電素子を収縮または伸長し、電極の
慣性力を利用して電極を圧電素子と一体に移動させるこ
となく圧電素子の自由端を元の位置に復帰する。According to the electrode feeding device for electric discharge machining of the present invention, when the electrode is fed or returned, the piezoelectric element is extended or contracted in the traveling direction of the electrode at a slow speed, and the frictional force between the electrode and the guide member is used. Move the electrode in the direction of travel. The piezoelectric element contracts or expands at a rapid speed in the direction in which the electrode moves in the opposite direction, and returns the free end of the piezoelectric element to its original position without moving the electrode integrally with the piezoelectric element by using the inertial force of the electrode.
【０００８】電極の進行方向および反進行方向への圧電
素子の伸縮動作の繰り返しによって電極のみの送り戻し
動作を行う。[0008] Only the electrode is fed back by repeating the expansion and contraction of the piezoelectric element in the direction of travel and the direction of reverse travel of the electrode.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。本発明の第１実施例による放電加工用電極送り装
置を図１に示す。放電加工用電極送り装置１は以下のよ
うに構成される。積層型の圧電素子１１は円板状の圧電
素子が板厚方向に積層されて形成されている。圧電素子
１１の一端はハウジング１０に固定され、電極１６に平
行に設置されている。移動部１３および押圧部１４はア
ルミニウム等の放熱性の良い金属で形成されている。移
動部１３は圧電素子１１の他端に固定されている。押圧
部１４はコイルスプリング１５の一端に固定され、コイ
ルスイプリング１５の他端はハウジング１０に固定され
ている。コイルスプリング１５は押圧部１４を付勢し、
電極１６を移動部１３に押し付けている。電極１６は、
移動部１３と押圧部１４とに挾持されるとともに案内さ
れワーク２０に対向している。電極１６は給電線１２に
接続され、給電線１２を介して後述する放電電源３１か
ら常に放電電圧が印加されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an electrode feeding device for electric discharge machining according to a first embodiment of the present invention. The electrode feed device 1 for electric discharge machining is configured as follows. The laminated piezoelectric element 11 is formed by laminating disk-shaped piezoelectric elements in the thickness direction. One end of the piezoelectric element 11 is fixed to the housing 10 and installed in parallel with the electrode 16. The moving part 13 and the pressing part 14 are formed of a metal having good heat dissipation such as aluminum. The moving section 13 is fixed to the other end of the piezoelectric element 11. The pressing portion 14 is fixed to one end of a coil spring 15, and the other end of the coil switching 15 is fixed to the housing 10. The coil spring 15 urges the pressing portion 14,
The electrode 16 is pressed against the moving part 13. The electrode 16
It is sandwiched between the moving part 13 and the pressing part 14 and is guided and opposed to the work 20. The electrode 16 is connected to the power supply line 12, and a discharge voltage is constantly applied from a discharge power supply 31 described later via the power supply line 12.
【００１０】制御回路部３０は、電極１６およびワーク
２０間に放電電圧を印加する放電電源３１、電極１６の
ワーク２０への加工状態を判定する加工状態判別回路３
２、加工状態判別回路３２からの信号により電極１６の
移動方向を決定するサーボ回路３３、圧電素子１１に印
加する駆動電圧を発生する圧電素子駆動回路３４から構
成される。The control circuit unit 30 includes a discharge power source 31 for applying a discharge voltage between the electrode 16 and the work 20, and a machining state determination circuit 3 for determining a machining state of the electrode 16 on the work 20.
2. A servo circuit 33 for determining the moving direction of the electrode 16 based on a signal from the machining state determination circuit 32, and a piezoelectric element driving circuit 34 for generating a driving voltage applied to the piezoelectric element 11.
【００１１】放電電源３１は、給電線１２を介して電極
１６に一端を接続し、被加工物であるワーク２０に他端
を接続し、常に電極１６およびワーク２０間に放電電圧
を印加している。加工状態判別回路３２は、放電電源３
１から電極１６およびワーク２０間に印加される放電電
圧により電極１６とワーク２０との間に流れる電流値を
計測し、電極１６とワーク２０との通電状態を検知す
る。電極１６とワーク２０との通電状態は、(1) 開放、
(2) 放電、(3) 短絡に分類できる。(1) 開放は、電極１
６とワーク２０との間に電流が流れていない状態を示
す。(2) 放電は、電極１６とワーク２０との間に放電電
流が流れている状態を示す。(3) 短絡は、電極１６とワ
ーク２０とが電気的に接触している状態を示す。加工状
態判別回路３２は、この通電状態によりワーク２０への
加工状態を判別する。The discharge power supply 31 has one end connected to the electrode 16 via the power supply line 12, the other end connected to the work 20 which is a workpiece, and always applying a discharge voltage between the electrode 16 and the work 20. I have. The machining state determination circuit 32 includes a discharge power source 3
A current value flowing between the electrode 16 and the work 20 is measured based on a discharge voltage applied from 1 to the electrode 16 and the work 20, and a conduction state between the electrode 16 and the work 20 is detected. The energized state between the electrode 16 and the work 20 is (1) open,
It can be classified into (2) discharge and (3) short circuit. (1) Open the electrode 1
6 shows a state in which no current flows between the workpiece 6 and the work 20. (2) Discharge indicates a state in which a discharge current flows between the electrode 16 and the work 20. (3) The short circuit indicates a state where the electrode 16 and the work 20 are in electrical contact. The processing state determination circuit 32 determines the processing state of the work 20 based on the energized state.
【００１２】サーボ回路３３は、加工状態判別回路３２
から(1) 開放、(2) 放電、(3) 短絡の何れかの判別信号
を入力し、ワーク２０に対する電極１６の移動方向を決
定する移動信号を圧電素子駆動回路３４に出力する。移
動信号は、(1) 送り、(2) 戻り、(3) 停止の３信号に分
類される。(1) 送りは、電極１６をワーク２０に近付け
ることを示す。(2) 戻しは、電極１６をワーク２０から
離すことを示す。(3)停止は、電極１６を動かさないこ
とを示す。The servo circuit 33 includes a machining state determination circuit 32
A determination signal of any one of (1) open, (2) discharge, and (3) short circuit is inputted from the controller, and a movement signal for determining a moving direction of the electrode 16 with respect to the work 20 is output to the piezoelectric element drive circuit 34. Movement signals are classified into three signals: (1) send, (2) return, and (3) stop. (1) Feeding indicates that the electrode 16 is brought closer to the work 20. (2) Return indicates that the electrode 16 is separated from the work 20. (3) Stop indicates that the electrode 16 is not moved.
【００１３】圧電素子駆動回路３４は、サーボ回路３３
から移動信号を入力し、圧電素子１１への駆動電圧を決
定する。以下、電極の送り動作について図２に基づいて
説明する。図２の下側は圧電素子１１に印加される駆動
電圧の同一波形を示し、点線部分の電圧がそれぞれ圧電
素子１１に印加される。上段は、そのときの圧電素子１
１の伸縮状態と移動部１３および電極１６の位置を示
す。The piezoelectric element driving circuit 34 includes a servo circuit 33
And a drive signal to the piezoelectric element 11 is determined. Hereinafter, the electrode feeding operation will be described with reference to FIG. 2 shows the same waveform of the drive voltage applied to the piezoelectric element 11, and the voltages indicated by the dotted lines are applied to the piezoelectric element 11, respectively. The upper row shows the piezoelectric element 1 at that time.
1 shows the expansion / contraction state and the positions of the moving unit 13 and the electrode 16.
【００１４】図２に示す圧電素子１１が収縮した(1) の
状態から、図２の(2) の圧電素子駆動電圧を囲む点線に
示すように、緩やかに上昇する圧電素子駆動電圧が圧電
素子１１に印加されると、圧電素子１１はワークに向か
って緩やかに第１速度で伸長する。電極１６は常に移動
部１３と押圧部１４とに挾持されているため、移動部１
３が圧電素子１１の伸長とともにワークに向かって緩や
かに移動すると、移動部１３と電極１６との間には静摩
擦力が生じ、電極１６は移動部１３とともに緩やかにワ
ークに向かって移動する。図２の(3) の圧電素子印加電
圧を囲む点線に示すように、圧電素子１１への駆動電圧
の上昇が止まり圧電素子１１の伸長が急に停止すると、
移動部１３も圧電素子１１とともに急に停止し、移動部
１３とともにワークに向かって移動していた電極１６は
慣性力でさらにワークに向かって移動する。図２の(4)
の圧電素子駆動電圧を囲む点線に示すように、圧電素子
１１への駆動電圧を急激に減少させ圧電素子１１を第１
速度より急速な第２速度で急激に収縮させると、移動部
１３と電極１６との間には静摩擦力に代わって動摩擦力
が生じ、この動摩擦力により電極１６はワークから僅か
に戻されるが電極１６の慣性力によりそれ以上は戻され
ない。圧電素子１１は、図２の (5)に示すように図２の
(1) と同じ状態になり、電極１６の送り動作の１ステッ
プが完了する。From the state (1) in which the piezoelectric element 11 shown in FIG. 2 is contracted, as shown by a dotted line surrounding the piezoelectric element driving voltage in FIG. When applied to the piezoelectric element 11, the piezoelectric element 11 gradually expands toward the work at the first speed . Since the electrode 16 is always held between the moving portion 13 and the pressing portion 14 , the moving portion 1
When the piezoelectric element 3 moves gently toward the work with the extension of the piezoelectric element 11, a static friction force is generated between the moving part 13 and the electrode 16, and the electrode 16 moves gently toward the work together with the moving part 13. As indicated by the dotted line surrounding the applied voltage of the piezoelectric element in FIG. 2C, when the drive voltage to the piezoelectric element 11 stops increasing and the extension of the piezoelectric element 11 suddenly stops,
The moving unit 13 also stops suddenly together with the piezoelectric element 11, and the electrode 16 that has moved toward the work together with the moving unit 13 moves further toward the work due to inertial force. (4) in FIG.
As shown by the dotted line surrounding the piezoelectric element drive voltage of FIG .
When the electrode is rapidly contracted at the second speed, which is faster than the speed, a dynamic friction force is generated between the moving portion 13 and the electrode 16 instead of the static friction force. No more is returned by the inertia force of 16. As shown in FIG. 2 (5), the piezoelectric element 11
It becomes the same state as (1), and one step of the feeding operation of the electrode 16 is completed.
【００１５】図４の１０１に示す階段状の曲線は、１階
段が電極の送り動作の１ステップに対応している。電極
１６をワークに送り続ける場合、この送り動作ステップ
が繰り返され、電極１６がワーク２０に近付く。以下、
電極の戻し動作について図３に基づいて説明する。図３
の下側は圧電素子１１に印加される駆動電圧の同一波形
を示し、点線部分の電圧がそれぞれ圧電素子１１に印加
される。電極１６の戻し動作時に圧電素子１１に印加さ
れる駆動電圧は、電極１６の送り動作時に圧電素子１１
に印加される駆動電圧を反転したものである。上段は、
そのときの圧電素子１１の伸縮状態と移動部１３および
電極１６の位置を示す。In the step-shaped curve shown by 101 in FIG. 4, one step corresponds to one step of the electrode feeding operation. When the electrode 16 is continuously fed to the work, the feed operation step is repeated, and the electrode 16 approaches the work 20. Less than,
The operation of returning the electrodes will be described with reference to FIG. FIG.
The lower side shows the same waveform of the drive voltage applied to the piezoelectric element 11, and the voltages indicated by the dotted lines are applied to the piezoelectric element 11, respectively. The driving voltage applied to the piezoelectric element 11 during the return operation of the electrode 16 depends on the piezoelectric element 11 during the feed operation of the electrode 16.
Is the inverse of the drive voltage applied to. The upper row is
The expansion / contraction state of the piezoelectric element 11 and the positions of the moving part 13 and the electrode 16 at that time are shown.
【００１６】図３に示す圧電素子１１が伸長した(1) の
状態から、図３の(2) の圧電素子駆動電圧を囲む点線に
示すように、緩やかに減少する圧電素子駆動電圧が圧電
素子１１に印加されると、圧電素子１１は緩やかに第１
速度で収縮する。電極１６は、常に移動部１３と押圧部
１４とに挾持されているため、移動部１３が圧電素子１
１の収縮とともに緩やかにワークから離れると、移動部
１３と電極１６との間には静摩擦力が生じ、電極１６は
移動部１３とともに緩やかにワークから離れる。図３の
(3) の圧電素子駆動電圧を囲む点線に示すように、圧電
素子１１への駆動電圧の減少が止まり圧電素子１１の収
縮が急に停止すると、移動部１３も圧電素子１１ととも
に急に停止し、移動部１３とともにワークから離れるよ
うに移動していた電極１６は慣性力でさらにワークから
離れる。図３の(4) の圧電素子駆動電圧を囲む点線に示
すように、圧電素子１１への駆動電圧を急激に上昇させ
圧電素子１１を第１速度より急速な第２速度で急激に伸
長させると、移動部１３と電極１６との間には静摩擦力
に代わって動摩擦力が生じ、この動摩擦力により電極１
６はワークに僅かに送られるが電極１６の慣性力により
それ以上は送られない。圧電素子１１は、図３の(5) に
示すように図３の(1) と同じ状態になり、電極の戻し動
作の１ステップが完了する。When the piezoelectric element 11 shown in FIG. 3 is expanded (1), as shown by the dotted line surrounding the piezoelectric element driving voltage in FIG. When applied to 11, the piezoelectric element 11 is gradually first
Shrink at speed . The electrode 16 is always connected to the moving part 13 and the pressing part.
Because it is pinched and 14, the moving unit 13 is a piezoelectric element 1
When the moving part 13 is gradually separated from the work with the contraction of the electrode 1, a static friction force is generated between the moving part 13 and the electrode 16, and the electrode 16 is gradually separated from the work together with the moving part 13. Of FIG.
As indicated by the dotted line surrounding the piezoelectric element drive voltage in (3), when the drive voltage to the piezoelectric element 11 stops decreasing and the contraction of the piezoelectric element 11 suddenly stops, the moving section 13 also suddenly stops together with the piezoelectric element 11. The electrode 16 that has moved away from the work together with the moving unit 13 further moves away from the work by inertia. As shown by the dotted line surrounding the piezoelectric element drive voltage in FIG. 3D, when the drive voltage to the piezoelectric element 11 is rapidly increased and the piezoelectric element 11 is rapidly extended at the second speed which is faster than the first speed. , A dynamic frictional force is generated between the moving part 13 and the electrode 16 instead of the static frictional force.
6 is slightly fed to the work, but is not further fed due to the inertial force of the electrode 16. As shown in (5) of FIG. 3, the piezoelectric element 11 is in the same state as (1) of FIG. 3, and one step of the electrode returning operation is completed.
【００１７】図４の１０２に示す階段状の曲線は、１階
段が電極の戻し動作の１ステップに対応している。電極
１６をワーク２０から戻し続ける場合、この戻し動作ス
テップが繰り返され、電極１６がワーク２０から離れ
る。電極１６の送り戻し量の微調整は、初期状態から圧
電素子１１への駆動電圧をアナログ制御することによっ
て圧電素子１１の伸縮量を微調整し、これにともない電
極１６の送り戻し量を最終的に微調整する。また、電極
１６の送り戻し時、圧電素子１１の軸方向に大きな伸び
量または縮み量を確保できるので、電極１６の送り戻し
を的確にできる。送り戻し動作の繰り返しにより電極１
６の送り戻し量を適宜調整できる。In the step-like curve shown at 102 in FIG. 4, one step corresponds to one step of the electrode returning operation. When the electrode 16 is continuously returned from the work 20, the return operation step is repeated, and the electrode 16 is separated from the work 20. The fine adjustment of the amount of return of the electrode 16 is performed by finely adjusting the amount of expansion and contraction of the piezoelectric element 11 by analogly controlling the drive voltage to the piezoelectric element 11 from the initial state. Tweak to. Further, when the electrode 16 is fed back, a large amount of expansion or contraction in the axial direction of the piezoelectric element 11 can be secured, so that the electrode 16 can be sent back accurately. Electrode 1 by repeating the sending back operation
6 can be adjusted as appropriate.
【００１８】また、電極１６が線状のものであるので電
極摩耗しても連続的に電極が補給送りされるので、電極
消耗時の交換作業の頻度が低減でき、電極の頻繁な交換
作業が不要となり、保守点検作業が容易になるという効
果がある。さらに、制御装置部３０により放電加工を制
御しているので、高応答な電極送り特性を実現するため
にサーボモータを利用した放電加工機よりも加工速度が
向上するとともに、集中放電などの異常放電の発生を抑
制できるので加工精度が向上する。Further, since the electrodes 16 are linear, even if the electrodes are worn, the electrodes are continuously supplied and fed, so that the frequency of replacement work when the electrodes are worn can be reduced, and frequent replacement work of the electrodes can be performed. This has the effect of making it unnecessary and facilitating maintenance and inspection work. Further, since the electric discharge machining is controlled by the control unit 30, the machining speed is improved as compared with an electric discharge machine using a servomotor in order to realize a high response electrode feed characteristic, and abnormal electric discharge such as concentrated electric discharge is performed. Since the occurrence of cracks can be suppressed, the processing accuracy is improved.
【００１９】以下、本発明の放電加工用電極送り装置の
第２および第３実施例について説明する。同一符号を記
したものは第１実施例と同一の構成、作動および効果を
有するので説明を省略する。本発明の第２実施例による
放電加工電極送り装置を図５に基づいて説明する。放電
電極１７は押圧部１４に端面を露出して埋め込み固定さ
れ、常に電極１６に接している。放電電源３１は放電電
極１７に一端を接続し、ワーク２０に他端を接続し、常
に放電電圧を放電電極１７およびワーク２０間に印加し
ている。Hereinafter, second and third embodiments of the electrode feeding device for electric discharge machining according to the present invention will be described. Those denoted by the same reference numerals have the same configuration, operation, and effect as those of the first embodiment, and thus description thereof will be omitted. A second embodiment of the present invention will be described with reference to FIG. The discharge electrode 17 is embedded and fixed with the end face exposed to the pressing portion 14 and is always in contact with the electrode 16. The discharge power supply 31 has one end connected to the discharge electrode 17 and the other end connected to the work 20, and always applies a discharge voltage between the discharge electrode 17 and the work 20.
【００２０】本発明の第３実施例による放電加工用電極
送り装置を図６に基づいて説明する。抑えピン１８は移
動部１３にピン軸１８ａの一部を埋め込んで固定されて
いる。コイルスプリング１５はピン軸１８ａに嵌め込ま
れて一端を抑えピン１８のピン頭部１８ｂに当接し、他
端を押圧部１４に当接している。コイルスプリング１５
は押圧部１４を付勢し、電極１６を移動部１３に押し付
けている。A third embodiment of the present invention will now be described with reference to FIG. The holding pin 18 is fixed by embedding a part of the pin shaft 18 a in the moving part 13. The coil spring 15 is fitted into the pin shaft 18 a, one end of which is held down and abuts on the pin head 18 b of the pin 18, and the other end abuts on the pressing portion 14. Coil spring 15
Biases the pressing portion 14 to press the electrode 16 against the moving portion 13.
【００２１】押圧部１４がコイルスプリング１５に付勢
されながら移動部１３とともに移動するので、電極１６
に働く移動部１３と押圧部１４との摩擦力が均一にな
り、電極１６の送り戻し動作が良好に行われる。Since the pressing portion 14 moves together with the moving portion 13 while being urged by the coil spring 15, the electrode 16
The frictional force between the moving part 13 and the pressing part 14 acting on the electrode 16 becomes uniform, and the operation of feeding back the electrode 16 is performed well.
【００２２】[0022]
【発明の効果】以上説明したように、本発明の放電加工
用電極送り装置によれば、電極のみの送り戻しの移動動
作により被加工物を放電加工するので移動重量が低減で
き、低電圧でも電極の送り戻しが可能であり電力消費量
が低減できる。また、わずかな電圧の変化に応じて電極
の送り戻し量が調節できるので加工精度が向上する。さ
らに、低電圧および軽量のため装置の小型化が可能であ
るという効果がある。As described above, according to the electrode feeder for electric discharge machining of the present invention, the workpiece is subjected to electric discharge machining by the operation of returning only the electrode, so that the moving weight can be reduced, and even at a low voltage. The electrode can be sent back and the power consumption can be reduced. In addition, since the feed back amount of the electrode can be adjusted according to a slight change in voltage, the processing accuracy is improved. Further, there is an effect that the device can be downsized because of low voltage and light weight.
【図１】本発明の第１実施例による放電加工用電極送り
装置の制御システムを示す模式的構成図である。FIG. 1 is a schematic configuration diagram showing a control system of an electrode feeding device for electric discharge machining according to a first embodiment of the present invention.
【図２】本発明の第１実施例による放電加工用電極送り
装置の電極送り動作ならびに圧電素子への印加電圧を示
す説明図である。FIG. 2 is an explanatory diagram showing an electrode feeding operation of an electrode feeding device for electric discharge machining and a voltage applied to a piezoelectric element according to a first embodiment of the present invention.
【図３】本発明の第１実施例による放電加工用電極送り
装置の電極戻し動作ならびに圧電素子への印加電圧を示
す説明図である。FIG. 3 is an explanatory diagram showing an electrode returning operation of the electrode feeding device for electric discharge machining according to the first embodiment of the present invention and a voltage applied to a piezoelectric element.
【図４】本発明の第１実施例による放電加工用電極送り
装置の電極送り戻し動作時の電極とワークとの時間およ
び距離を示す特性図である。FIG. 4 is a characteristic diagram illustrating a time and a distance between an electrode and a workpiece during an electrode feeding back operation of the electrode feeding device for electric discharge machining according to the first embodiment of the present invention.
【図５】本発明の第２実施例による放電加工用電極送り
装置の制御システムを示す模式的構成図である。FIG. 5 is a schematic configuration diagram showing a control system of an electrode feeding device for electric discharge machining according to a second embodiment of the present invention.
【図６】本発明の第３実施例による放電加工用電極送り
装置を示す模式的部分構成図である。FIG. 6 is a schematic partial configuration diagram showing an electrode feeding device for electric discharge machining according to a third embodiment of the present invention.
１０ ハウジング １１ 圧電素子 １２ 給電線 １３ 移動部（案内部材） １４ 押圧部（付勢手段） １５ コイルスプリング（付勢手段） １６ 電極 １８ 抑えピン（付勢手段） ２０ ワーク ３１ 放電電源（制御手段） ３２ 加工状態判別回路（制御手段） ３３ サーボ回路（制御手段） ３４ 圧電素子駆動回路（制御手段） 10 Housing 11 Piezoelectric element 12 Power supply line 13 Moving part (guide member) 14 pressing part (biasing means) 15 Coil spring (biasing means) 16 electrodes 18 Holding pin (urging means) 20 Work 31 Discharge power supply (control means) 32 Machining state determination circuit (control means) 33 servo circuit (control means) 34 Piezoelectric element drive circuit (control means)
フロントページの続き (72)発明者 森田 浩充 愛知県刈谷市昭和町１丁目１番地 日本 電装株式会社内 (72)発明者 毛利 尚武 愛知県名古屋市天白区久方２−12−１ 豊田工業大学内 (72)発明者 古谷 克司 愛知県名古屋市天白区久方２−12−１ 豊田工業大学内 (56)参考文献 特開 平５−146919（ＪＰ，Ａ) 特開 平４−17584（ＪＰ，Ａ) 特開 平３−79237（ＪＰ，Ａ) 特開 平７−9266（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B23H 7/30 Continuing from the front page (72) Inventor Hiromitsu Morita 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (72) Inventor Katsushi Furuya 2-12-1 Hisagata, Tenpaku-ku, Nagoya City, Aichi Prefecture Inside Toyota Institute of Technology (56) References JP-A-5-146919 (JP, A) JP-A-4-17584 (JP, A JP-A-3-79237 (JP, A) JP-A-7-9266 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B23H 7/30
Claims (5)
を移動する案内部材と、 前記案内部材との間に前記電極を挟持する押圧部と、 前記押圧部を付勢し前記案内部材に前記電極を押圧する
付勢手段と、 前記電極の進行方向に前記案内部材と前記電極との間に
静摩擦力を生じる第１速度で前記圧電素子を伸長または
収縮させる第１の動作と前記電極の反進行方向に前記第
１速度よりも急速で前記案内部材と前記電極との間に動
摩擦力を生じる第２速度で前記圧電素子を収縮または伸
長させる第２の動作とを繰り返すように、前記圧電素子
に印加する電圧を制御する制御手段と、前記案内部材に固定された固定部材と、 を備え、前記付勢手段は、一端が前記固定部材に当接し、他端が
前記押圧部に当接し、前記押圧部を付勢して前記電極を
前記案内部材に押し付け、 前記押圧部は前記案内部材とともに移動する ことを特徴
とする放電加工用電極送り装置。1. A stackable piezoelectric element that can be expanded and contracted, a guide member fixed to a free end of the piezoelectric element and moving an electrode by frictional contact, and a pressing portion that sandwiches the electrode between the guide member Urging means for urging the pressing portion to press the electrode against the guide member; and between the guide member and the electrode in a traveling direction of the electrode.
A first operation for extending or contracting the piezoelectric element at a first speed at which a static frictional force is generated, and a movement between the guide member and the electrode in a direction opposite to the direction of movement of the electrode, which is faster than the first speed.
Control means for controlling a voltage applied to the piezoelectric element so as to repeat a second operation of contracting or expanding the piezoelectric element at a second speed at which a frictional force is generated, and a fixing member fixed to the guide member. The urging means has one end in contact with the fixing member and the other end in contact with the fixing member.
Abutting on the pressing portion, urging the pressing portion to cause the electrode
The electrode feed device for electric discharge machining , wherein the pressing portion is pressed against the guide member, and the pressing portion moves together with the guide member .
において、 さらに、送り、戻りの移動信号を前記制御手段に与える
サーボ回路を備え、 前記制御手段から前記電極の戻し動作時に前記圧電素子
に印加される電圧は、前記電極の送り動作時に前記圧電
素子に印加される電圧を反転したものであることを特徴
とする放電加工用電極送り装置。2. The electric discharge machining electrode feed device according to claim 1, further comprising a servo circuit for supplying a feed and return movement signal to said control means, wherein said piezoelectric element is provided when said control means returns said electrode. Wherein the voltage applied to the electrode is obtained by inverting the voltage applied to the piezoelectric element during the electrode feeding operation.
において、 前記制御手段は、 前記電極の送り動作の１ステップを、前記第１の動作
と、その後の前記第２の動作とにより完了し、 前記電極の戻し動作の１ステップを、前記第１の動作
と、その後の前記第２の動作とにより完了することを特
徴とする放電加工用電極送り装置。3. The electrode feeding device for electric discharge machining according to claim 2, wherein the control means completes one step of the electrode feeding operation by the first operation and the subsequent second operation. An electrode feeding device for electric discharge machining, wherein one step of the electrode returning operation is completed by the first operation and the second operation thereafter.
において、 前記制御手段は、 前記電極の送り動作の１ステップを、前記第１速度で前
記圧電素子を伸長させ、その後前記第２速度で前記圧電
素子を収縮させて完了し、 前記電極の戻し動作の１ステップを、前記第１速度で前
記圧電素子を収縮させ、その後前記第２速度で前記圧電
素子を伸長させて完了することを特徴とする放電加工用
電極送り装置。4. The electrode feeding device for electric discharge machining according to claim 2, wherein the control means performs one step of the electrode feeding operation by extending the piezoelectric element at the first speed, and thereafter the second speed. And completing the step of returning the electrodes by contracting the piezoelectric element at the first speed and then expanding the piezoelectric element at the second speed. Characteristic electrode feeder for electric discharge machining.
電加工用電極送り装置において、前記固定部材は前記案内部材に固定された抑えピンであ
り、 前記付勢手段は、一端が前記抑えピンに当接し、他端が
前記押圧部に当接し、前記押圧部を付勢して前記電極を
前記案内部材に押し付けるコイルスプリングであること
を特徴とする放電加工用電極送り装置。5. The electrode feeding device for electric discharge machining according to claim 1 , wherein the fixing member is a holding pin fixed to the guide member.
The biasing means is a coil spring that has one end in contact with the holding pin, the other end in contact with the pressing portion, and biases the pressing portion to press the electrode against the guide member. Electrode feeder for electric discharge machining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16142093A JP3537157B2 (en) | 1993-06-30 | 1993-06-30 | Electrode feeder for electric discharge machining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16142093A JP3537157B2 (en) | 1993-06-30 | 1993-06-30 | Electrode feeder for electric discharge machining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH079265A JPH079265A (en) | 1995-01-13 |
| JP3537157B2 true JP3537157B2 (en) | 2004-06-14 |
Family
ID=15734765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16142093A Expired - Lifetime JP3537157B2 (en) | 1993-06-30 | 1993-06-30 | Electrode feeder for electric discharge machining |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3537157B2 (en) |
-
1993
- 1993-06-30 JP JP16142093A patent/JP3537157B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH079265A (en) | 1995-01-13 |
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