JP2711852B2 - Control method of wire electric discharge machining - Google Patents
Control method of wire electric discharge machiningInfo
- Publication number
- JP2711852B2 JP2711852B2 JP63110388A JP11038888A JP2711852B2 JP 2711852 B2 JP2711852 B2 JP 2711852B2 JP 63110388 A JP63110388 A JP 63110388A JP 11038888 A JP11038888 A JP 11038888A JP 2711852 B2 JP2711852 B2 JP 2711852B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- machining
- workpiece
- electrode
- wire
- 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
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は，走行するワイヤ電極と工作物との間で放
電を発生させて放電エネルギーによって工作物を放電加
工するワイヤ放電加工の制御方法及びその制御装置に関
する。Description: BACKGROUND OF THE INVENTION The present invention relates to a wire electric discharge control method for generating a discharge between a traveling wire electrode and a workpiece and discharging the workpiece by discharge energy, and a method of controlling the same. It relates to the control device.
一般に，ワイヤ放電加工機において，サーボ送り方式
では，極間電圧と基準電圧との差電圧に基づいて，該差
電圧に比例した加工送り速度を分配する電圧サーボ送り
方式が使われてきた。このサーボ送り方式では，極間電
圧と基準電圧との差電圧が小さければ加工送り速度は遅
くなり，極間電圧と基準電圧との差電圧が大きくなれば
加工送り速度が速くなる。従って，加工形状のコーナ部
の加工時等において，ワイヤ電極がコーナ部を通る瞬間
に，一時的に加工間隙が非常に大きくなるために，加工
送り速度が急激に速くなる。2. Description of the Related Art In general, in a wire electric discharge machine, in a servo feed system, a voltage servo feed system that distributes a machining feed speed proportional to a difference voltage between a gap voltage and a reference voltage has been used. In this servo feed system, if the difference voltage between the gap voltage and the reference voltage is small, the machining feed speed is slow, and if the difference voltage between the gap voltage and the reference voltage is large, the machining feed speed is fast. Therefore, at the moment when the wire electrode passes through the corner portion, for example, at the time of machining the corner portion of the machining shape, the machining gap becomes very large temporarily, so that the machining feed speed increases rapidly.
従来，板厚変化のある被加工物を能率よく，高精度で
加工するワイヤカット放電加工装置は，例えば，特公昭
62-11969号公報に開示されている。Conventionally, wire-cut electric discharge machines that efficiently and highly accurately process workpieces with varying thicknesses are known from, for example,
It is disclosed in JP-A-62-11969.
該ワイヤカット放電加工装置は，所望形状に加工され
る被加工物の板厚変化に関する情報を含む加工の形状寸
法情報を記憶する記憶媒体と，該記憶媒体に記憶された
情報に従って相対移動するワイヤ電極と被加工物間に加
工エネルギーを供給する加工用電源装置と，該加工用電
源装置の加工エネルギーにより被加工物を加工する際の
ワイヤ電極と被加工物間の加工電圧を基準電圧と比較
し，その差電圧に比例した加工送り速度でワイヤ電極と
被加工物を相対移動させる信号を出力する誤差増幅器
と，前記記憶媒体の板厚変化に関する情報を入力とし，
該情報に応じたワイヤ電極と被加工物間の相対速度信号
を出力する板厚速度変換装置と，前記誤差増幅器の出力
信号と前記板厚速度変換装置の出力信号を入力し，前記
誤差増幅器の出力信号を前記板厚速度変換装置の出力信
号に一致させるように前記加工用電源装置の電気条件を
制御する電気条件設定装置を具備し，前記板厚速度変換
装置が，所定の被加工物の材質に対する板厚と最適加工
送り速度の関係を記憶し，被加工物の板厚変化前の板厚
における加工送り速度と、板厚変化後の板厚に対する加
工送り速度を前記記憶内容を参照して求め，両者の比を
被加工物の板厚変化前の加工送り速度に乗じることによ
り板厚変化後の新板厚に対する送り速度を計算するもの
である。The wire-cut electric discharge machine includes a storage medium for storing machining shape and dimension information including information relating to a change in thickness of a workpiece to be processed into a desired shape, and a wire relatively moving according to the information stored in the storage medium. A processing power supply that supplies processing energy between the electrode and the workpiece, and the processing voltage between the wire electrode and the workpiece when processing the workpiece with the processing energy of the processing power supply is compared with a reference voltage An error amplifier that outputs a signal for relatively moving the wire electrode and the workpiece at a processing feed rate proportional to the difference voltage, and information about a change in the thickness of the storage medium, and
A thickness speed conversion device for outputting a relative speed signal between the wire electrode and the workpiece according to the information; an output signal of the error amplifier and an output signal of the thickness speed conversion device; An electrical condition setting device for controlling an electrical condition of the power supply device for processing so as to match an output signal with an output signal of the thickness speed converting device; The relationship between the sheet thickness for the material and the optimum machining feed rate is stored, and the machining feed rate at the sheet thickness before the sheet thickness change of the workpiece and the machining feed rate for the sheet thickness after the sheet thickness change are referred to the stored contents. The feed rate for the new sheet thickness after the change in the thickness is calculated by multiplying the ratio between the two and the processing feed rate before the change in the sheet thickness of the workpiece.
しかしながら，上記電圧サーボ送り方式では，例え
ば，加工形状のコーナ部の加工時において，コーナを曲
がる瞬間に，一時加工間隙が非常に大きくなるために，
加工送り速度が急激に速くなるが，モータ等の駆動用ア
クチュエータを含めた加工テーブルの駆動系等の応答特
性の遅れがある。従って，加工送り速度の指令通りに，
瞬時に駆動系が応答できず，必ず遅れ時間を生じる。However, in the above-described voltage servo feed method, for example, when machining a corner portion of a machining shape, a temporary machining gap becomes very large at the moment when the corner is turned.
Although the processing feed speed is rapidly increased, there is a delay in response characteristics of a driving system of a processing table including a driving actuator such as a motor. Therefore, according to the command of machining feed rate,
The drive system cannot respond instantaneously, and a delay time always occurs.
従って，加工送り速度指令が急激に大きくなってもあ
る時間だけ遅れて，即ち，ある遅れ時間後に，加工テー
ブルの駆動系が動き始め，逆に，加工間隙が狭くなり，
加工送り速度指令が急激に小さくなったとしても，加工
テーブルが相対的に前進を続けるために，ワイヤ電極と
工作物とが接触してしまい，最後に，後退指令がでても
直ちには後退できないために，乱調状態になり，いわゆ
る不安定加工になってしまう。Therefore, even if the machining feed rate command suddenly increases, the drive system of the machining table starts moving after a certain time, that is, after a certain delay time, and conversely, the machining gap becomes narrower.
Even if the machining feed speed command suddenly decreases, the wire electrode and the workpiece come into contact because the machining table continues to advance relatively, and finally, it cannot be retracted immediately even if a retraction command is issued. As a result, a turbulent state occurs, resulting in so-called unstable machining.
そこで，上記のような不安定加工を防止するために如
何にしてワイヤ放電加工を制御するかの課題があった。Therefore, there is a problem how to control the wire electric discharge machining in order to prevent the unstable machining as described above.
また，前掲特公昭62-11969号公報に開示されたワイヤ
カット放電加工装置は，高精度加工を達成するため，被
加工物の板厚変化に応じて加工送り速度を変化させるも
のであり，基準電圧を変化させたものではない。The wire-cut electric discharge machine disclosed in the above-mentioned Japanese Patent Publication No. 62-11969 changes the machining feed rate according to the change in the thickness of the workpiece in order to achieve high-precision machining. It does not change the voltage.
この発明の目的は，上記の課題を解決することであ
り，同一の板厚の工作物をワイヤ放電加工する場合に，
該工作物のコーナ部等の加工において，加工形状誤差を
極力小さくして，高精度の加工を可能にするように基準
電圧を一時的に変更する制御を行い，工作物に対する不
安定加工を排除したワイヤ放電加工の制御方法及びその
制御装置を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to perform wire electric discharge machining on a workpiece having the same thickness.
In machining the corners of the workpiece, control to temporarily change the reference voltage to minimize machining shape errors and enable high-precision machining, eliminating unstable machining of the workpiece It is an object of the present invention to provide a wire electric discharge machining control method and a control device therefor.
この発明は，上記の目的を達成するために，次のよう
に構成されている。即ち，この発明は，ワイヤ電極と工
作物との間に極間電圧を印加して前記工作物を放電加工
するワイヤ放電加工の制御方法において，前記ワイヤ電
極と前記工作物との間の前記極間電圧を制御に適した極
間電圧に調整し，調整された前記極間電圧と予め設定さ
れた基準電圧とを比較して差電圧を検出し，検出された
前記差電圧に基づいて加工送り速度を設定し，検出され
た前記差電圧の大きさに応じて加工条件を変更すると共
に，前記基準電圧を一時的に変更して前記差電圧を限り
なく零に近づける制御をし，前記加工送り速度をほぼ一
定にすることを特徴とするワイヤ放電加工の制御方法に
関する。The present invention is configured as follows to achieve the above object. That is, the present invention relates to a wire electric discharge machining control method for applying an inter-electrode voltage between a wire electrode and a workpiece to perform electrical discharge machining on the workpiece, wherein the electrode is disposed between the wire electrode and the workpiece. The inter-electrode voltage is adjusted to an inter-electrode voltage suitable for control, a difference voltage is detected by comparing the adjusted inter-electrode voltage with a preset reference voltage, and machining feed is performed based on the detected difference voltage. A speed is set, machining conditions are changed in accordance with the magnitude of the detected difference voltage, and the reference voltage is temporarily changed to control the difference voltage as close to zero as possible. The present invention relates to a method for controlling wire electric discharge machining, wherein the speed is made substantially constant.
また，この発明は，ワイヤ電極と工作物との間に極間
電圧を印加して前記工作物を放電加工するワイヤ放電加
工の制御装置において，前記ワイヤ電極と前記工作物と
の間の前記極間電圧を制御に適した電圧に調整するバッ
ファアンプ，予め設定された基準電圧を出力する基準電
圧制御部，前記バッファアンプで調整された前記極間電
圧と前記基準電圧制御部から出力された前記基準電圧と
を比較して差電圧を検出するコンパレータ，前記コンパ
レータによって検出された前記差電圧に基づいて加工送
り速度を設定する加工送り速度設定部，前記差電圧の大
きさに応じて加工条件を変更する加工条件変更装置，及
び前記差電圧を限りなく零に近づけるように前記基準電
圧を一時的に変更する基準電圧制御部，から成ることを
特徴とするワイヤ放電加工の制御装置に関する。The present invention also relates to a wire electric discharge machining control device for applying an inter-electrode voltage between a wire electrode and a workpiece to perform electrical discharge machining on the workpiece, wherein the electrode between the wire electrode and the workpiece is provided. Amplifier that adjusts the inter-voltage to a voltage suitable for control, a reference voltage controller that outputs a preset reference voltage, the inter-electrode voltage that is adjusted by the buffer amplifier, and the output that is output from the reference voltage controller. A comparator for comparing with a reference voltage to detect a difference voltage, a machining feed speed setting unit for setting a machining feed speed based on the difference voltage detected by the comparator, and a machining condition according to the magnitude of the difference voltage. And a reference voltage control unit for temporarily changing the reference voltage so that the difference voltage approaches zero as much as possible. On the processing of the control device.
この発明によるワイヤ放電加工の制御方法及びその制
御装置は，上記のように構成されており，次のように作
用する。即ち，この発明は，ワイヤ電極と工作物との間
に極間電圧を印加して前記工作物を放電加工するワイヤ
放電加工において，極間電圧と基準電圧との差電圧に基
づいて加工送り速度を設定し，該差電圧の大きさに応じ
て加工条件を変更し，更に前記差電圧を限りなく零に近
づけるように基準電圧を変更するように制御したので，
工作物に対する加工図形に屈折部及び屈曲部のコーナ部
等が存在する場合に，該コーナ部等の加工においても，
極間電圧と基準電圧との差電圧を零に近いほぼ一定値に
なるように制御でき、従って，加工送り速度がほぼ一定
となって加工間隙が均一になり，安定した加工精度を確
保することができ，形状誤差を極力小さくすることがで
きる。The control method and the control device for the wire electric discharge machining according to the present invention are configured as described above, and operate as follows. That is, the present invention relates to a wire electric discharge machine for applying an inter-electrode voltage between a wire electrode and a workpiece to perform electro-discharge machining on the workpiece, in which a machining feed rate is determined based on a difference voltage between the inter-electrode voltage and a reference voltage. Was set, and the machining conditions were changed in accordance with the magnitude of the difference voltage, and further, the control was performed so as to change the reference voltage so that the difference voltage approached zero as much as possible.
If there are corners, etc., in the bent part and the bent part in the machining figure for the workpiece,
The difference voltage between the gap voltage and the reference voltage can be controlled to be almost constant, close to zero. Therefore, the machining feed rate is almost constant, the machining gap becomes uniform, and stable machining accuracy is secured. And the shape error can be minimized.
以下，図面を参照して，この発明によるワイヤ放電加
工機の制御方法及びその制御装置の一実施例を詳述す
る。Hereinafter, an embodiment of a control method of a wire electric discharge machine according to the present invention and a control device thereof will be described in detail with reference to the drawings.
第１図，第２図，第３図及び第４図は，この発明によ
るワイヤ放電加工の制御方法及び制御装置を説明するた
めの図であり，第１図はこの発明によるワイヤ放電加工
の制御方法を達成するためのワイヤ放電加工の制御装置
の一実施例を示す概略説明図，第２図は極間電圧と基準
電圧との差電圧に応じる加工条件のデータ例を示す表，
第３図は加工電圧と差電圧との関係を示すグラフ，及び
第４図は休止時間と差電圧との関係を示すグラフであ
る。FIGS. 1, 2, 3, and 4 are diagrams for explaining a control method and a control device for wire electric discharge machining according to the present invention, and FIG. 1 is a diagram for controlling wire electric discharge machining according to the present invention. FIG. 2 is a schematic explanatory view showing an embodiment of a control device for wire electric discharge machining for achieving the method, FIG. 2 is a table showing data examples of machining conditions according to a difference voltage between a gap voltage and a reference voltage,
FIG. 3 is a graph showing the relationship between the machining voltage and the difference voltage, and FIG. 4 is a graph showing the relationship between the pause time and the difference voltage.
一般的に，ワイヤ放電加工装置では，工作物取付台に
対して工作物２が設置され，該工作物取付台は水平方向
に移動できるように構成されている。即ち，工作物２を
取付けている工作物取付台は,NC装置からの指令で工作
物２の加工状況に応じてＸ方向及びＹ方向に移動し，ワ
イヤヘッドに供給されたワイヤ電極１との間でサーボモ
ータにより駆動されるサーボ送り機構によってサーボ移
動を繰り返し進行し，両者の移動が合成された相対的運
動によって工作物２は所定の加工形状に放電加工されて
いる。更に，工作物２に対して上下にワイヤヘッドが設
けられ，これらのワイヤヘッドは，給電子，給電子押え
部材，ダイスガイド部材，加工液噴射ノズル等から成
る。自動ワイヤ供給装置等からローラガイド等を介して
送り込まれたワイヤ電極１は，上ワイヤヘッドにおける
内側筒体内に設置されたダイスガイド部材を通り，工作
物２を放電加工した後に下ワイヤヘッドにおける内側筒
体内に設置されたダイスガイド部材を通って巻取リー
ル，使用済ワイヤ溜部等に排出される。In general, in a wire electric discharge machine, a workpiece 2 is installed on a work mount, and the work mount is configured to be movable in a horizontal direction. That is, the work mounting table on which the work 2 is mounted moves in the X and Y directions in accordance with the processing state of the work 2 in accordance with a command from the NC device, and contacts the wire electrode 1 supplied to the wire head. Servo movement is repeatedly advanced by a servo feed mechanism driven by a servo motor between the two, and the workpiece 2 is subjected to electric discharge machining into a predetermined machining shape by a relative motion obtained by combining the two. Further, a wire head is provided above and below the workpiece 2, and these wire heads are composed of a power supply, a power supply holding member, a die guide member, a working liquid jet nozzle, and the like. A wire electrode 1 fed from an automatic wire feeder or the like via a roller guide or the like passes through a die guide member installed in an inner cylinder of the upper wire head, and discharges the workpiece 2 to the inner side of the lower wire head. The paper is discharged to a take-up reel, a used wire storage part, and the like through a die guide member provided in the cylinder.
上記のようなワイヤ放電加工機において，この発明に
よるワイヤ放電加工の制御方法は，次のような構成から
成る。このワイヤ放電加工の制御方法は，主として，ワ
イヤ電極１と工作物２との間に極間電圧を印加して工作
物２を放電加工するワイヤ放電加工において，極間電圧
Vgと基準電圧v0との差電圧VFに基づいて加工送り速度を
設定し，該差電圧VFの大きさに応じて加工条件を変更
し，更に基準電圧v0を一時的に変更して前記差電圧VFを
限りなく零に近づける制御をし，加工送り速度をほぼ一
定にすることを特徴とするものである。In the above-described wire electric discharge machine, the control method of the wire electric discharge machining according to the present invention has the following configuration. This wire electric discharge machining control method is mainly used in a wire electric discharge machining in which a gap voltage is applied between the wire electrode 1 and the workpiece 2 to discharge the workpiece 2.
The machining feed rate is set based on the difference between the voltage V F of the V g and a reference voltage v 0, the processing conditions change according to the magnitude of the difference voltage V F, further temporarily change the reference voltage v 0 and a control closer to zero as possible the difference voltage V F and is characterized in that a substantially constant machining feed speed.
また，この発明によるワイヤ放電加工の制御装置は，
ワイヤ電極１と工作物２との間に極間電圧Vgを印加して
工作物２を放電加工するものであり，ワイヤ電極１と工
作物２との間の極間電圧Vgを制御に適した電圧に調整す
るバッファアンプ3,予め設定された基準電圧v0を出力す
る基準電圧制御部5,バッファアンプ３で調整された極間
電圧Vgと基準電圧制御部５から出力された基準電圧v0と
を比較して差電圧VFを検出するコンパレータ4,コンパレ
ータ４によって検出された差電圧VFに基づいて加工送り
速度を設定する加工送り速度設定部6,差電圧VFの大きさ
に応じて加工条件を変更する加工条件変更装置9,及び差
電圧VFを限りなく零に近づけるように基準電圧v0を一時
的に変更する基準電圧制御部５から構成されている。In addition, the control device for wire electric discharge machining according to the present invention includes:
Is intended to discharge machining the workpiece 2 by applying a machining gap voltage V g between the wire electrode 1 and the workpiece 2, the control inter-electrode voltage V g between the wire electrode 1 and the workpiece 2 A buffer amplifier 3 for adjusting to a suitable voltage, a reference voltage control unit 5 for outputting a preset reference voltage v 0 , a gap voltage V g adjusted by the buffer amplifier 3, and a reference output from the reference voltage control unit 5. comparator 4 which detects a differential voltage V F is compared with the voltage v 0, machining feed speed setting unit 6 for setting a machining feed speed based on the difference voltage V F which is detected by the comparator 4, the differential voltage V F size and a reference voltage control unit 5 to temporarily change the reference voltage v 0 as close to zero as machining condition changing device 9 for changing the processing conditions, and a difference voltage V F only if the.
このワイヤ放電加工の制御装置を詳しく説明すると，
次のとおりである。ワイヤ電極１と工作物２との間の極
間電圧Vgをバッファアンプ３によって制御に適した電圧
に調整し，該極間電圧Vgをコンパレータ４に入力すると
共に，極間電圧Vgがコンパレータ４に入力されたことに
応答してNC制御部８の指令によって基準電圧制御部５で
設定されている基準電圧v0をコンパレータ４に入力す
る。The control device of this wire electric discharge machining will be described in detail.
It is as follows. The inter-electrode voltage V g between the wire electrode 1 and the workpiece 2 is adjusted to a voltage suitable for the control by the buffer amplifier 3 inputs the polar voltage V g to the comparator 4, inter-electrode voltage V g is In response to the input to the comparator 4, the reference voltage v 0 set by the reference voltage control unit 5 is input to the comparator 4 according to a command from the NC control unit 8.
コンパレータ４において，該基準電圧v0と極間電圧Vg
とを比較し，極間電圧Vgと基準電圧v0との差電圧VFを常
に導き出す。差電圧VFを加工条件変更装置９に入力し，
工作物２のコーナ部等の加工位置によって変化する差電
圧VFの大きさによって，例えば，第２図に示すように，
極間電圧Vgと基準電圧v0との差電圧VFに応じて予めプリ
セットした加工電圧V,休止時間TOFF等の加工条件データ
に基づいて加工条件を変更する。或いは，第３図及び第
４図に示すように，差電圧VFの大きさによって加工電圧
V,休止時間TOFF等の加工条件を予めプリセットしたデー
タに基づいてリニアに増減させ,NC制御部８の制御によ
って加工条件変更装置９で加工条件を変更して加工用電
源装置10に該変更加工条件を入力する。In the comparator 4, the reference voltage v 0 and the gap voltage V g
Comparing the door always derive a difference voltage V F of the inter-electrode voltage V g and the reference voltage v 0. Enter the differential voltage V F to the machining condition changing device 9,
The magnitude of the differential voltage V F which varies with the machining position of the corner portion or the like of the workpiece 2, for example, as shown in Figure 2,
Inter-electrode voltage V g and the reference voltage v 0 and the machining voltage V which is preset in advance according to the differential voltage V F of changing the machining conditions based on the processing condition data such as the downtime T OFF. Alternatively, as shown in FIGS. 3 and 4, machining voltage by the magnitude of the differential voltage V F
The machining conditions such as V and the pause time T OFF are linearly increased or decreased based on the preset data, and the machining conditions are changed by the machining condition changing device 9 under the control of the NC control unit 8 and the machining power supply device 10 is changed. Enter the processing conditions.
この変更加工条件の入力によって加工用電源装置10か
ら印加される極間電圧Vgを変化させ，ワイヤ電極１と工
作物２間に印加する。次いで，この変化した極間電圧Vg
を，初期の設定極間電圧VGに速やかに戻すために，極間
電圧Vgと基準電圧v0との差電圧VFを零に近づけるよう
に,NC制御部８からの信号によって基準電圧制御部５で
基準電圧v0を一時的に変更する。例えば、工作物２の加
工形状のコーナ部を加工する場合，ワイヤ電極１がコー
ナを曲がった瞬間，極間電圧Vgは加工液を通じて流れる
リーク電流による極間電圧降下分を無負荷電圧E0より差
し引いたオープン電圧V0近傍まで上昇する。The input of the change processing conditions by changing the machining gap voltage V g applied from the machining power source unit 10, is applied between the wire electrode 1 and the workpiece 2. Then, this changed inter-electrode voltage V g
And to return quickly to the initial setting inter-electrode voltage V G, as close to zero differential voltage V F of the inter-electrode voltage V g and the reference voltage v 0, the reference voltage by a signal from the NC control unit 8 The control unit 5 temporarily changes the reference voltage v 0 . For example, when processing a corner portion of the processing shape of the workpiece 2, at the moment when the wire electrode 1 bends the corner, the inter-electrode voltage V g is calculated by subtracting the inter-electrode voltage drop due to the leak current flowing through the machining fluid to the no-load voltage E 0. It rises to the open voltage V 0 the vicinity of more minus.
このワイヤ放電加工の制御方法では，上記オープン電
圧V0近傍まで上昇した極間電圧Vgと基準電圧v0との差電
圧VFを検出後，この差電圧VFの値をNC制御部８にフィー
ドバックし，直ちに該差電圧VFの大きさに応じて，加工
電圧Ｖを下げ，休止時間TOFFを長くする等の加工条件を
自動的に変更するようにNC制御部８から加工条件変更装
置９に指令を出す。The wire electric discharge machining control method, the open voltage V 0 after detecting a difference voltage V F of the inter-electrode voltage V g and the reference voltage v 0 which rises to the vicinity of the value of the differential voltage V F NC controller 8 fed back to and immediately in accordance with the magnitude of the difference voltage V F, machining voltage lowering V, machining condition changing processing conditions such as a longer dwell time T OFF from the NC control unit 8 so as to automatically change It issues a command to the device 9.
更に，加工条件が変更されることによって平均極間電
圧は低下するので，工作物に対する加工を安定状態にさ
せるために初期の設定極間電圧値VGまで高くなるよう
に,NC制御部８から基準電圧制御部５へ指令を出して基
準電圧v0を一時的に自動的に高くさせる。Furthermore, the average since the machining gap voltage is reduced by the processing conditions are changed, such as high initial setting machining gap voltage V G in order to the work relative to the workpiece in a stable state, the NC control unit 8 A command is issued to the reference voltage control unit 5 to automatically increase the reference voltage v 0 temporarily.
このように基準電圧v0を高くさせることにより，極間
電圧Vgが高くなり，極間電圧Vgと基準電圧v0との差電圧
VFが小さくなるので、加工送り速度が急激に速くなるこ
とはなく，不安定な加工にはならず，安定した加工状態
を継続することができる。By increasing the reference voltage v 0 in this manner, the gap voltage V g increases, and the difference voltage between the gap voltage V g and the reference voltage v 0
Since V F becomes small, the machining feed speed does not increase rapidly, and the machining does not become unstable, and a stable machining state can be maintained.
次いで，極間電圧Vgが初期の設定極間電圧値VGに戻れ
ば，それを検出し，更に極間電圧Vgと基準電圧v0との差
電圧VFが零に近づくように小さくなるので，再び,NC制
御部８から加工条件変更装置９及び基準電圧制御部５へ
指令を出して上記で変更した加工条件及び基準電圧v0を
初期の状態に戻す。Then, Returning inter-electrode voltage V g is the initial setting machining gap voltage V G, detect it, as further difference voltage V F of the inter-electrode voltage V g and the reference voltage v 0 approaches zero small Therefore, a command is issued again from the NC control unit 8 to the processing condition changing device 9 and the reference voltage control unit 5 to return the changed processing conditions and the reference voltage v 0 to the initial state.
以上のように，放電加工を行うことによって工作物２
の加工形状のコーナ部での加工形状誤差を極力小さくで
き，高精度加工が提供できる。As described above, the workpiece 2
The machining shape error at the corner of the machining shape can be minimized, and high precision machining can be provided.
この発明によるワイヤ放電加工の制御方法及びその制
御装置は，上記のように構成されており，次のような効
果を有する。即ち，この発明は，ワイヤ電極と工作物と
の間に極間電圧を印加して前記工作物を放電加工するワ
イヤ放電加工において，極間電圧と基準電圧との差電圧
に基づいて加工送り速度を設定し，該差電圧の大きさに
応じて加工条件を変更し，前記差電圧を限りなく零に近
づけるように基準電圧を一時的に変更するように制御し
たので，工作物に対する加工図形に屈折部及び屈曲部の
コーナ部等が存在する場合に，該コーナ部等の加工にお
いても，極間電圧と基準電圧との差電圧をほぼ一定に保
って加工送り速度を一定に維持するように制御でき，従
って加工間隙が均一になり，安定した加工精度を得るこ
とができ，形状誤差を極力小さくすることができる。そ
れ故に，前記工作物に対して所望の加工形状が得られ，
高精度加工を実現することができる。The control method and the control device of the wire electric discharge machining according to the present invention are configured as described above, and have the following effects. That is, the present invention relates to a wire electric discharge machine for applying an inter-electrode voltage between a wire electrode and a workpiece to perform electro-discharge machining on the workpiece, in which a machining feed rate is determined based on a difference voltage between the inter-electrode voltage and a reference voltage. And the machining conditions are changed in accordance with the magnitude of the difference voltage, and the reference voltage is controlled so as to be temporarily changed so that the difference voltage approaches zero as much as possible. When there are corners and the like of the bent portion and the bent portion, in the machining of the corners and the like, the difference voltage between the gap voltage and the reference voltage is kept almost constant so that the machining feed speed is kept constant. Thus, the machining gap can be made uniform, stable machining accuracy can be obtained, and the shape error can be minimized. Therefore, a desired machining shape is obtained for the workpiece,
High precision processing can be realized.
第１図はこの発明によるワイヤ放電加工の制御方法を達
成するための制御装置の一実施例を示す概略説明図，第
２図は極間電圧と基準電圧との差電圧に応じる加工条件
のデータ例を示す表，第３図は加工電圧と差電圧との関
係を示すグラフ，及び第４図は休止時間と差電圧との関
係を示すグラフである。 １……ワイヤ電極,2……工作物,4……コンパレータ,5…
…基準電圧制御部,6……加工送り速度設定部,8……NC制
御部,9……加工条件変更装置,10……加工用電源装置。FIG. 1 is a schematic explanatory view showing an embodiment of a control device for achieving a control method of wire electric discharge machining according to the present invention, and FIG. 2 is data of machining conditions according to a difference voltage between a gap voltage and a reference voltage. FIG. 3 is a graph showing the relationship between the machining voltage and the difference voltage, and FIG. 4 is a graph showing the relationship between the pause time and the difference voltage. 1 ... wire electrode, 2 ... workpiece, 4 ... comparator, 5 ...
… Reference voltage control section, 6… Processing feed speed setting section, 8… NC control section, 9… Processing condition changing device, 10… Processing power supply unit.
Claims (2)
加して前記工作物を放電加工するワイヤ放電加工の制御
方法において，前記ワイヤ電極と前記工作物との間の前
記極間電圧を制御に適した極間電圧に調整し，調整され
た前記極間電圧と予め設定された基準電圧とを比較して
差電圧を検出し，検出された前記差電圧に基づいて加工
送り速度を設定し，検出された前記差電圧の大きさに応
じて加工条件を変更すると共に，前記基準電圧を一時的
に変更して前記差電圧を限りなく零に近づける制御を
し，前記加工送り速度をほぼ一定にすることを特徴とす
るワイヤ放電加工の制御方法。1. A method for controlling electric discharge machining of a wire by applying an inter-electrode voltage between the wire electrode and the workpiece, wherein the gap between the wire electrode and the workpiece is controlled. A voltage is adjusted to a gap voltage suitable for control, a difference voltage is detected by comparing the adjusted gap voltage with a preset reference voltage, and a machining feed rate is determined based on the detected difference voltage. Is set, the machining conditions are changed in accordance with the magnitude of the detected difference voltage, and the reference voltage is temporarily changed to control the difference voltage as close to zero as possible. A method for controlling wire electric discharge machining, characterized in that the value is substantially constant.
加して前記工作物を放電加工するワイヤ放電加工の制御
装置において，前記ワイヤ電極と前記工作物との間の前
記極間電圧を制御に適した電圧に調整するバッファアン
プ，予め設定された基準電圧を出力する基準電圧制御
部，前記バッファアンプで調整された前記極間電圧と前
記基準電圧制御部から出力された前記基準電圧とを比較
して差電圧を検出するコンパレータ，前記コンパレータ
によって検出された前記差電圧に基づいて加工送り速度
を設定する加工送り速度設定部，前記差電圧の大きさに
応じて加工条件を変更する加工条件変更装置，及び前記
差電圧を限りなく零に近づけるように前記基準電圧を一
時的に変更する基準電圧制御部，から成ることを特徴と
するワイヤ放電加工の制御装置。2. A wire electric discharge machining control apparatus for applying an inter-electrode voltage between a wire electrode and a workpiece to perform electrical discharge machining on the workpiece, wherein the gap between the wire electrode and the workpiece is provided. A buffer amplifier for adjusting a voltage to a voltage suitable for control, a reference voltage control unit for outputting a preset reference voltage, the inter-electrode voltage adjusted by the buffer amplifier, and the reference output from the reference voltage control unit A comparator for comparing the voltage with the voltage to detect a difference voltage, a machining feed speed setting unit for setting a machining feed speed based on the difference voltage detected by the comparator, and changing a machining condition according to the magnitude of the difference voltage And a reference voltage controller for temporarily changing the reference voltage so that the difference voltage approaches zero as much as possible. The control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63110388A JP2711852B2 (en) | 1988-05-09 | 1988-05-09 | Control method of wire electric discharge machining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63110388A JP2711852B2 (en) | 1988-05-09 | 1988-05-09 | Control method of wire electric discharge machining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01281821A JPH01281821A (en) | 1989-11-13 |
| JP2711852B2 true JP2711852B2 (en) | 1998-02-10 |
Family
ID=14534543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63110388A Expired - Lifetime JP2711852B2 (en) | 1988-05-09 | 1988-05-09 | Control method of wire electric discharge machining |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2711852B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011045935A (en) * | 2009-08-25 | 2011-03-10 | Sodick Co Ltd | Method for wire cut electric discharge machining |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0463630A (en) * | 1990-06-29 | 1992-02-28 | Makino Milling Mach Co Ltd | Control method and device for wire discharge machining device |
| JPH0691435A (en) * | 1992-07-31 | 1994-04-05 | Fanuc Ltd | Electric discharge machine and electric discharge maching method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55125931A (en) * | 1979-03-15 | 1980-09-29 | Mitsubishi Electric Corp | Wire cut electrical discharge machining apparatus |
| JPS5775727A (en) * | 1980-10-29 | 1982-05-12 | Hitachi Seiko Ltd | Discharge processing control device |
-
1988
- 1988-05-09 JP JP63110388A patent/JP2711852B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011045935A (en) * | 2009-08-25 | 2011-03-10 | Sodick Co Ltd | Method for wire cut electric discharge machining |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01281821A (en) | 1989-11-13 |
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