JP2010012551A - Wire electric discharge machine having single power supply - Google Patents

Wire electric discharge machine having single power supply Download PDF

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JP2010012551A
JP2010012551A JP2008174400A JP2008174400A JP2010012551A JP 2010012551 A JP2010012551 A JP 2010012551A JP 2008174400 A JP2008174400 A JP 2008174400A JP 2008174400 A JP2008174400 A JP 2008174400A JP 2010012551 A JP2010012551 A JP 2010012551A
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voltage
electric discharge
low frequency
switching elements
frequency component
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JP5236368B2 (en
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Akiyoshi Kawahara
章義 川原
Masao Murai
正生 村井
Akihiro Sakurai
章博 桜井
Yasuo Nakajima
廉夫 中島
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Fanuc Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire electric discharge machine providing a signal indicating the inter-pole state while applying an AC high frequency voltage between poles without allowing the inter-pole voltage to be biased to one polarity. <P>SOLUTION: This wire electric discharge machine includes: a voltage application means 3 for superimposing an AC low frequency component on the AC high frequency voltage with a single power supply; and a low frequency component detection means 11 for detecting an AC low frequency voltage from the voltage between poles. The voltage application means 3 includes: a DC voltage source 31; and a drive signal generator for independently generating drive signals S1, S2 in a set of switching elements 32a, 32b for applying a voltage so that a wire electrode 1 is positive (+) and a workpiece 2 is negative, a set of switching elements 32c, 32d for applying a voltage so that the wire electrode 1 is negative and the workpiece 2 is positive. The AC high frequency voltage is applied between poles by alternately driving the sets of switching elements, and the low frequency component is superimposed independently on the sets of the switching elements by changing their duty ratios with time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、所定の間隙をもって対向配置されたワイヤ電極と被加工物との間（以下、「極間」という）に間欠的な放電を発生させ、被加工物を加工するワイヤ放電加工機に関する。   The present invention relates to a wire electric discharge machine for machining a workpiece by generating an intermittent discharge between a wire electrode and a workpiece that are arranged to face each other with a predetermined gap (hereinafter referred to as “between electrodes”). .

ワイヤ放電加工機では、ワイヤ電極と被加工物とを相対的に移動させて加工を行う。通常、ワイヤ電極と被加工物の相対移動速度は、極間の電圧を検出し、検出した電圧をローパスフィルタを用いて平均化処理を行い、その平均化処理された電圧（以下、「平均電圧」という）を基に制御される。   In the wire electric discharge machine, machining is performed by relatively moving the wire electrode and the workpiece. Usually, the relative movement speed of the wire electrode and the workpiece is detected by detecting the voltage between the electrodes, averaging the detected voltage using a low-pass filter, and then averaging the detected voltage (hereinafter referred to as “average voltage”). ”).

放電の頻度は極間の間隙距離と相関があり、相対的に間隙が狭いほど放電の頻度は高くなり、逆に間隙が広いと放電の頻度は低くなる。放電すると電圧が低下するため、放電の頻度が高いほど極間の平均電圧は低く、放電の頻度が低いと逆に極間の平均電圧は高くなるので、極間の平均電圧により極間の間隙距離を推定できる。   The frequency of discharge correlates with the gap distance between the poles. The smaller the gap is, the higher the frequency of discharge is. On the contrary, the wider the gap is, the lower the frequency of discharge is. Since the voltage drops when discharging, the higher the frequency of discharge, the lower the average voltage between the electrodes. Conversely, the lower the frequency of discharging, the higher the average voltage between the electrodes, so the average voltage between the electrodes causes a gap between the electrodes. Distance can be estimated.

従来は、ワイヤ電極と被加工物に並列接続したコンデンサに充電し、コンデンサからの放電を利用して加工していたこともあり、片極性の電圧で加工していた。そのため、検出した極間電圧をそのまま平均化処理して、その平均電圧に基づいて前記相対移動速度を制御していた。   Conventionally, a capacitor connected in parallel to the wire electrode and the workpiece is charged and processed using the discharge from the capacitor. Therefore, the detected inter-electrode voltage is averaged as it is, and the relative movement speed is controlled based on the average voltage.

近年、電解腐食による加工面質の低下を防ぐため、交流電圧による加工が主流となっている。このため、加工中の極間電圧を整流し一方の極性の電圧に変換し、その平均電圧に基づき前記相対移動速度を制御するのが一般的である。図１（ａ）は、ワイヤ放電加工機に用いられる放電加工用電源装置の一般的な構成を示すブロック図である。図１に示す放電加工用電源装置３’は、外部からの指令に基づいて高周波交流電圧を発生させ、ワイヤ電極１と被加工物２との極間に印加する。そうすると、極間に高周波の放電が発生し、放電加工が実施される。図１（ｂ）は、図１（ａ）に示す放電加工用電源装置で極間に印加される無負荷電圧波形の一例である。図１（ｂ）に示されるように、極間に印加される高周波交流電圧は、０（Ｖ）を中心に対称に振動する波形である。   In recent years, machining by AC voltage has become the mainstream in order to prevent degradation of the machined surface quality due to electrolytic corrosion. For this reason, it is common to rectify the inter-electrode voltage during processing, convert it to a voltage of one polarity, and control the relative movement speed based on the average voltage. Fig.1 (a) is a block diagram which shows the general structure of the power supply apparatus for electric discharge machining used for a wire electric discharge machine. A power supply device 3 ′ for electric discharge machining shown in FIG. 1 generates a high-frequency alternating voltage based on an external command and applies it between the wire electrode 1 and the workpiece 2. If it does so, a high frequency electric discharge will generate | occur | produce between poles and electrical discharge machining will be implemented. FIG. 1B is an example of a no-load voltage waveform applied between the electrodes in the electric discharge machining power supply device shown in FIG. As shown in FIG. 1B, the high-frequency AC voltage applied between the electrodes has a waveform that oscillates symmetrically about 0 (V).

正極性加工と逆極性加工時において、繰り返し周波数１ＭＨｚ以上の短い時間幅の等しい高周波交流電圧を一定の電圧値で継続的に加工間隙である極間に印加し、高い繰り返し頻度で放電を発生させることによって、面粗さの非常に細かな加工面が得られることが知られている。例えば、特許文献１には、１ＭＨｚ〜５ＭＨｚの高周波電圧を用いることで、１μｍＲｍａｘ以下、また、特許文献２には、７ＭＨｚ〜３０ＭＨｚの高周波電圧を用いることで、０．５μｍＲｍａｘ以下の加工面が得られることが開示されている。   During positive polarity machining and reverse polarity machining, a high-frequency AC voltage with a repetition frequency of 1 MHz or more and a short time width is continuously applied between the poles that are the machining gap at a constant voltage value, and discharge is generated at a high repetition frequency. Thus, it is known that a processed surface with very fine surface roughness can be obtained. For example, Patent Document 1 uses a high frequency voltage of 1 MHz to 5 MHz to obtain a processed surface of 1 μm Rmax or less, and Patent Document 2 uses a high frequency voltage of 7 MHz to 30 MHz to obtain a processed surface of 0.5 μm Rmax or less. Is disclosed.

特許文献３には、高周波電源を用いるワイヤ放電加工機において、極間に交流高周波電圧に加え、直流電圧を印加する手段と、前記極間電圧から低周波成分を検出する低周波検出手段（ローパス・フィルタ）とを備えることで、極間の状態を示す信号を得る技術が開示されている。   In Patent Document 3, in a wire electric discharge machine using a high-frequency power source, a means for applying a DC voltage in addition to an AC high-frequency voltage between the electrodes, and a low-frequency detecting means for detecting a low-frequency component from the voltage between the electrodes (low-pass) A technique for obtaining a signal indicating a state between electrodes by providing a filter) is disclosed.

特開昭６１−２６０９１５号公報Japanese Patent Laid-Open No. 61-260915 特開平７−９２５８号公報Japanese Unexamined Patent Publication No. 7-9258 特許第３８４２２７９号公報Japanese Patent No. 3842279

特許文献１や特許文献２に開示されるように高周波電圧の周波数は高く、整流回路の動作限界を超えるため、整流した電圧から極間の状態を判別することは困難である。数ＭＨｚ以上、具体的には１ＭＨｚ以上の交流高周波電源を用いる場合には、極間電圧に応じた前記相対移動速度の制御は困難であり、安定した加工を行えない場合がある。   As disclosed in Patent Document 1 and Patent Document 2, since the frequency of the high-frequency voltage is high and exceeds the operation limit of the rectifier circuit, it is difficult to determine the state between the electrodes from the rectified voltage. When an AC high frequency power source of several MHz or higher, specifically 1 MHz or higher is used, it is difficult to control the relative moving speed according to the voltage between the electrodes, and stable machining may not be performed.

また、特許文献３に開示されるように直流電圧を印加し極間の状態を検出する技術では、極間電圧が片極性に偏ってしまうため、電解腐食による加工面質の低下を防止することが困難である。   In addition, as disclosed in Patent Document 3, in the technique of applying a DC voltage and detecting the state between the electrodes, the voltage between the electrodes is biased to one polarity, and therefore, it is possible to prevent deterioration of the work surface quality due to electrolytic corrosion. Is difficult.

そこで本発明は、交流高周波電圧を極間に印加しつつ、極間電圧が片極性に偏ることなく、極間の状態を示す信号を得ることが可能なワイヤ放電加工機を提供することを目的とする。   Accordingly, an object of the present invention is to provide a wire electric discharge machine capable of obtaining a signal indicating a state between electrodes while applying an alternating-current high-frequency voltage between the electrodes while the voltage between the electrodes is not unipolar. And

本願の請求項１に係る発明は、所定の間隙をもって対向配置されたワイヤ電極と被加工物との間である極間に交流高周波電圧を印加して放電を発生させ加工を行うワイヤ放電加工機において、単一電源で交流高周波電圧に交流低周波成分を重畳する電圧印加手段と、
極間の電圧から交流低周波成分を検出する低周波成分検出手段と、を備えたことを特徴とするワイヤ放電加工機である。 The invention according to claim 1 of the present application is a wire electric discharge machine that performs processing by generating an electric discharge by applying an AC high-frequency voltage between poles between a wire electrode and a workpiece that are arranged to face each other with a predetermined gap. A voltage applying means for superimposing an AC low frequency component on an AC high frequency voltage with a single power source;
A wire electric discharge machine comprising low frequency component detection means for detecting an alternating low frequency component from a voltage between electrodes.

請求項２に係る発明は、前記単一電源で交流高周波電圧に交流低周波成分を重畳する電圧印加手段は、直流電圧源と、該直流電圧源をワイヤ電極が（＋）、被加工物が（−）の向きに断続的に極間に印加するためのスイッチング素子の組と、該直流電圧源をワイヤ電極が（−）、被加工物が（＋）の向きに断続的に極間に印加するためのスイッチング素子の組と、各々のスイッチング素子の組に対し独立に駆動信号を発生させる駆動信号発生器とを備え、スイッチング素子の組を交互に駆動することで交流高周波電圧を極間に印加し、各々のスイッチング素子の組に対し独立にデューティ比を時間変化させることで低周波成分を重畳することを特徴とする請求項１に記載のワイヤ放電加工機である。   According to a second aspect of the present invention, the voltage applying means for superimposing the alternating current low frequency component on the alternating current high frequency voltage with the single power source includes a direct current voltage source, the direct current voltage source being a wire electrode (+), and a workpiece being A set of switching elements for applying intermittently in the direction of (-) and the DC voltage source with the wire electrode (-) and the workpiece intermittently in the direction of (+) A set of switching elements for applying and a drive signal generator for generating a drive signal independently for each set of switching elements, and alternately driving the set of switching elements to generate an AC high frequency voltage between 2. The wire electric discharge machine according to claim 1, wherein the low-frequency component is superimposed by changing the duty ratio independently over time for each pair of switching elements.

本発明により、極間に交流高周波電圧を印加しつつ、極間電圧が片極性に偏ることなく、極間の状態を示す信号を得ることが可能なワイヤ放電加工機を提供できる。   According to the present invention, it is possible to provide a wire electric discharge machine capable of obtaining a signal indicating a state between electrodes while applying an alternating-current high-frequency voltage between the electrodes without biasing the voltage between the electrodes to one polarity.

以下、本発明の実施形態を図面と共に説明する。
図２は本発明の単一電源を備えたワイヤ放電加工機の実施形態の要部ブロック図である。加工槽６は加工液７で満たされている。被加工物２は加工槽６の加工液７に浸漬された状態で加工される。ワイヤ電極１と被加工物２とは、加工電圧供給線９ａ，９ｂを介して電圧印加手段３に電気的に接続されている。図２では、加工電圧供給線９ａを給電子８に接続し、加工電圧供給線９ｂを加工槽６内の被加工物２と電気的に接続されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a principal block diagram of an embodiment of a wire electric discharge machine equipped with a single power source of the present invention. The processing tank 6 is filled with the processing liquid 7. The workpiece 2 is processed while being immersed in the processing liquid 7 of the processing tank 6. The wire electrode 1 and the workpiece 2 are electrically connected to the voltage application means 3 via the machining voltage supply lines 9a and 9b. In FIG. 2, the machining voltage supply line 9 a is connected to the power supply 8, and the machining voltage supply line 9 b is electrically connected to the workpiece 2 in the machining tank 6.

電圧印加手段３は、ワイヤ電極１と被加工物２との間の極間に交流高周波電圧と交流低周波電圧とを重畳した状態で印加することが可能な単一の電源である。交流高周波電圧は被加工物を放電加工するために印加され、交流低周波電圧は極間の状態を検出するために印加される。このように、単一の電源で済むことから、小型化や低コスト化を実現できる。なお、極間の状態は、極間の間隙距離、極間のインピーダンス、あるいは放電の頻度を意味している。   The voltage application means 3 is a single power source that can apply an AC high-frequency voltage and an AC low-frequency voltage superimposed on the poles between the wire electrode 1 and the workpiece 2. An AC high frequency voltage is applied to discharge-process the workpiece, and an AC low frequency voltage is applied to detect a state between the electrodes. In this way, since a single power source is sufficient, it is possible to achieve downsizing and cost reduction. The state between the electrodes means the gap distance between the electrodes, the impedance between the electrodes, or the frequency of discharge.

極間１２（図１参照）のインピーダンスは、放電の状態によって変化する。放電の発生しない開放状態が最大で、ワイヤ電極１が被加工物２に接触する短絡状態が最小となる。極間１２に重畳した交流低周波成分の電圧の大きさは、この極間のインピーダンスに依存するので、極間電圧からローパスフィルタを通して、この交流低周波成分の電圧を取り出せば、その電圧で極間のインピーダンス、すなわち、極間の間隙を推定できる。取り出された交流周波数成分の電圧を例えば電圧計を用いて表示し、極間の状態をモニタすることができる。   The impedance of the gap 12 (see FIG. 1) varies depending on the state of discharge. The open state where no discharge is generated is the maximum, and the short-circuit state where the wire electrode 1 contacts the workpiece 2 is the minimum. Since the magnitude of the voltage of the AC low frequency component superimposed on the gap 12 depends on the impedance between the poles, if the voltage of the AC low frequency component is extracted from the voltage between the poles through a low pass filter, the voltage is The impedance between them, that is, the gap between the poles can be estimated. The voltage of the extracted AC frequency component can be displayed using, for example, a voltmeter, and the state between the electrodes can be monitored.

ワイヤ電極１と被加工物２との間の極間に発生する低周波の電圧変動を検出するために、低周波成分検出手段１１がワイヤ電極１と被加工物２と電気的に接続されている。低周波成分検出手段１１は、ローパスフィルタ４と整流回路５とを有する回路であって、検出線１０ａがワイヤ電極１に電気的に接続され、検出線１０ｂが被加工物２に電気的に接続されている。   In order to detect a low-frequency voltage fluctuation occurring between the wire electrode 1 and the workpiece 2, the low-frequency component detection means 11 is electrically connected to the wire electrode 1 and the workpiece 2. Yes. The low-frequency component detection means 11 is a circuit having a low-pass filter 4 and a rectifier circuit 5. The detection line 10 a is electrically connected to the wire electrode 1, and the detection line 10 b is electrically connected to the workpiece 2. Has been.

低周波成分検出手段１１の構成要素である整流回路５は、発明の課題で指摘したように、数ＭＨｚ以上、具体的には１ＭＨｚ程度以上の高周波では動作限界を超えるため追従できない。一方、数百ｋＨｚ以下、具体的には３００ｋＨｚ程度以下の比較的低周波であれば追従することができる。そこで、極間に印加される交流高周波電圧に比較的低周波の交流電圧を重畳して極間の状態を検出する。   As pointed out in the subject of the invention, the rectifier circuit 5 which is a constituent element of the low-frequency component detection means 11 cannot follow at a high frequency of several MHz or more, specifically about 1 MHz or more because it exceeds the operation limit. On the other hand, a relatively low frequency of several hundred kHz or less, specifically about 300 kHz or less, can be followed. Therefore, a relatively low frequency AC voltage is superimposed on the AC high frequency voltage applied between the electrodes to detect the state between the electrodes.

低周波成分検出手段１１の検出信号１１ａは、例えば、電圧計やワイヤ放電加工機を制御する数値制御装置（図示省略）に入力される。数値制御装置は、低周波成分検出手段１１の出力を受けて、各軸の送り速度を決定し、各軸の送り速度を極間の状態に応じて制御することができる。   The detection signal 11a of the low frequency component detection means 11 is input to, for example, a numerical control device (not shown) that controls a voltmeter and a wire electric discharge machine. The numerical controller can receive the output of the low-frequency component detection means 11, determine the feed rate of each axis, and control the feed rate of each axis according to the state between the poles.

次に、図３を用いて電圧印加手段３について説明する。図３は本発明である単一電源を備えたワイヤ放電加工機の電源および極間の状態を検出する手段の要部を示すブロック図である。電圧印加手段３、ワイヤ電極１、被加工物２、及び低周波成分検出手段１１の電気的な接続関係は図２について説明したとおりである。ここでは、電圧印加手段３について詳述する。   Next, the voltage applying means 3 will be described with reference to FIG. FIG. 3 is a block diagram showing the main part of the power source of the wire electric discharge machine equipped with a single power source according to the present invention and means for detecting the state between the electrodes. The electrical connection relationship between the voltage applying means 3, the wire electrode 1, the workpiece 2, and the low frequency component detecting means 11 is as described with reference to FIG. Here, the voltage application means 3 will be described in detail.

電圧印加手段３は、直流電圧源３１、スイッチング素子３２ａ〜３２ｄ、及び、駆動信号発生器３３を備えている。駆動信号発生器３３は、スイッチング素子３２ａ，３２ｂ用の駆動信号Ｓ１と、スイッチング素子３２ｃ，３２ｄ用の駆動信号Ｓ２とを生成する。   The voltage application unit 3 includes a DC voltage source 31, switching elements 32 a to 32 d, and a drive signal generator 33. The drive signal generator 33 generates a drive signal S1 for the switching elements 32a and 32b and a drive signal S2 for the switching elements 32c and 32d.

スイッチング素子３２ａ，３２ｂが駆動すると、直流電圧源がワイヤ電極（−）、被加工物（＋）の向きに印加される。スイッチング素子３２ｃ，３２ｄが駆動すると、直流電圧源３１がワイヤ電極（＋）、被加工物（−）の向きに印加される。   When the switching elements 32a and 32b are driven, a DC voltage source is applied in the direction of the wire electrode (−) and the workpiece (+). When the switching elements 32c and 32d are driven, the DC voltage source 31 is applied in the direction of the wire electrode (+) and the workpiece (−).

駆動信号発生器３３は、駆動信号Ｓ１と駆動信号Ｓ２のそれぞれに対して周期およびデューティ比を設定できる。さらに、デューティ比は時間的に変化させることも可能である。なお、周期やデューティ比を設定する回路構成は周知あるいは公知の技術で実現可能である。   The drive signal generator 33 can set a cycle and a duty ratio for each of the drive signal S1 and the drive signal S2. Furthermore, the duty ratio can be changed with time. The circuit configuration for setting the cycle and the duty ratio can be realized by a known or publicly known technique.

図４（ａ）は、駆動信号発生器３３で生成される駆動信号Ｓ１と駆動信号Ｓ２の波形の一例を示している。図４（ａ）に示されるように、駆動信号Ｓ１のはじめの３周期（図面左側）のデューティ比は、駆動信号Ｓ２のはじめの３周期のデューティ比より小さい。続く３周期は、駆動信号Ｓ１のデューティ比が駆動信号Ｓ２のデューティ比より大きい。   4A shows an example of the waveforms of the drive signal S1 and the drive signal S2 generated by the drive signal generator 33. FIG. As shown in FIG. 4A, the duty ratio of the first three periods (left side of the drawing) of the drive signal S1 is smaller than the duty ratio of the first three periods of the drive signal S2. In the subsequent three cycles, the duty ratio of the drive signal S1 is larger than the duty ratio of the drive signal S2.

そして、電圧印加手段３において直流電圧源３１の直流電圧は、駆動信号Ｓ１と駆動信号Ｓ２によって制御されるスイッチング素子３２ａ〜３２ｄによりオン・オフされ、オン・オフされた直流電圧は、図示しない配線インダクタンスや極間の浮遊容量の効果でなまった電圧波形となる。   In the voltage application means 3, the DC voltage of the DC voltage source 31 is turned on / off by the switching elements 32a to 32d controlled by the drive signal S1 and the drive signal S2, and the DC voltage turned on / off is not shown in the drawing. The voltage waveform is distorted by the effects of inductance and stray capacitance between the electrodes.

デューティ比が３周期ごとに異なることで極間電圧波形は、はじめの３周期で＋側にシフトし、続く３周期は−側にシフトする。すなわち、極間に印加される高周波交流電圧に交流低周波成分が重畳したことを示している。この極間に印加される印加電圧の一例として、図４（ｃ）に示される交流低周波成分と図４（ｄ）に示される交流高周波成分を示す。その結果、ワイヤ電極１と被加工物２との極間電圧波形は、図４（ｂ）に示されるようにはじめの３周期は＋側にシフトし、続く３周期は−側にシフトする。従って、単に直流電圧を印加する技術が有していた偏極性の問題を回避することができる。   By changing the duty ratio every three cycles, the voltage waveform between the electrodes shifts to the + side in the first three cycles, and shifts to the − side in the subsequent three cycles. That is, the AC low frequency component is superimposed on the high frequency AC voltage applied between the electrodes. As an example of the applied voltage applied between the electrodes, an AC low frequency component shown in FIG. 4C and an AC high frequency component shown in FIG. 4D are shown. As a result, the inter-electrode voltage waveform between the wire electrode 1 and the workpiece 2 is shifted to the + side in the first three cycles and shifted to the − side in the subsequent three cycles as shown in FIG. 4B. Therefore, it is possible to avoid the problem of polarization that the technique of simply applying a DC voltage has.

低周波成分検出手段１１は、ワイヤ電極１と被加工物２との極間電圧を検出する。低周波成分検出手段１１は、ローパスフィルタ４を備えており、このローパスフィルタ４を通して交流低周波の電圧成分（以下、「交流低周波電圧成分」という）を取り出す。カットオフ周波数を適切な値に設定、あるいはフィルタの次数を上げて急峻な減衰特性を持たせることによりローパフフィルタ４は十分に高周波成分を減衰できるため、高周波成分による、検出した交流低周波成分への悪影響を除去可能である。ローパスフィルタ４の符号「Ｒ」は抵抗、符号「Ｃ」はコンデンサを表している。   The low frequency component detection means 11 detects the interelectrode voltage between the wire electrode 1 and the workpiece 2. The low-frequency component detection means 11 includes a low-pass filter 4 and takes out an AC low-frequency voltage component (hereinafter referred to as “AC low-frequency voltage component”) through the low-pass filter 4. Since the low-puff filter 4 can sufficiently attenuate the high frequency component by setting the cutoff frequency to an appropriate value or increasing the filter order to have a steep attenuation characteristic, the detected AC low frequency component due to the high frequency component It is possible to remove the adverse effects on The symbol “R” of the low-pass filter 4 represents a resistor, and the symbol “C” represents a capacitor.

ローパスフィルタ４を通し取り出された交流低周波電圧成分は、整流回路５において一方の極性の信号である直流信号に変換する。整流回路５からの出力信号は低周波成分検出手段１１の出力信号として、図示省略した電圧計や数値制御装置に出力される。なお、整流回路５から出力される整流波形は、図５（ｄ）〜（ｆ）に一例として示す。   The AC low frequency voltage component taken out through the low-pass filter 4 is converted into a DC signal which is a signal of one polarity in the rectifier circuit 5. The output signal from the rectifier circuit 5 is output as an output signal of the low frequency component detection means 11 to a voltmeter or a numerical control device (not shown). In addition, the rectification waveform output from the rectifier circuit 5 is shown as an example in FIGS.

図５は、極間の状態における極間電圧波形と整流回路の出力波形を示す図である。図５（ａ）は極間状態が開放状態のときの極間電圧波形であり、（ｂ）は極間状態が放電状態のときの極間電圧波形であり、（ｃ）は極間状態が短絡状態の極間電圧波形を示している。また、図５（ｄ）は極間状態が開放状態のときの整流回路５の出力波形であり、（ｅ）は極間状態が放電状態のときの整流回路５の出力波形であり、（ｆ）は極間状態が短絡状態の整流回路５の出力波形である。   FIG. 5 is a diagram illustrating the inter-electrode voltage waveform and the output waveform of the rectifier circuit in the inter-electrode state. FIG. 5A shows an inter-electrode voltage waveform when the inter-electrode state is an open state, FIG. 5B shows an inter-electrode voltage waveform when the inter-electrode state is a discharge state, and FIG. 5C shows an inter-electrode state. The voltage waveform between the electrodes in a short-circuit state is shown. FIG. 5D shows the output waveform of the rectifier circuit 5 when the gap state is an open state, and FIG. 5E shows the output waveform of the rectifier circuit 5 when the gap state is a discharge state. ) Is an output waveform of the rectifier circuit 5 in which the inter-pole state is a short-circuit state.

単一の電源で交流高周波電圧に交流低周波成分を重畳する電圧印加手段をワイヤ放電加工機に適用した本発明の実施形態を説明した。前記「単一の電源で交流高周波電圧に交流低周波成分を重畳する電圧印加手段」は、ワイヤ放電加工機に限定されるわけではなく、雄型形状と雌型形状の組み合わせの放電加工機や電極棒を用いる放電加工機にも適用できる。   The embodiment of the present invention in which the voltage applying means for superimposing the AC low frequency component on the AC high frequency voltage with a single power source is applied to the wire electric discharge machine has been described. The “voltage applying means for superimposing an AC low frequency component on an AC high frequency voltage with a single power source” is not limited to a wire electric discharge machine, but an electric discharge machine having a combination of a male shape and a female shape, It can also be applied to an electric discharge machine using an electrode bar.

交流高周波電源を用いるワイヤ放電加工機の一般的な形態を示す図である。It is a figure which shows the general form of the wire electric discharge machine using an alternating current high frequency power supply. 本発明の単一電源を備えたワイヤ放電加工機の実施形態の要部ブロック図である。It is a principal part block diagram of embodiment of the wire electric discharge machine provided with the single power supply of this invention. 単一電源を備えたワイヤ放電加工機の電源および極間の状態を検出する手段の要部を示すブロック図である。It is a block diagram which shows the principal part of the means to detect the power supply of a wire electric discharge machine provided with the single power supply, and the state between electrodes. 電圧印加手段の駆動信号発生器で生成される駆動信号の一例と、極間に印加される電圧波形の一例と、電圧印加手段から出力される交流低周波成分の波形および交流高周波成分の波形の一例を示す図である。An example of the drive signal generated by the drive signal generator of the voltage application means, an example of the voltage waveform applied between the electrodes, the waveform of the AC low frequency component and the waveform of the AC high frequency component output from the voltage application means It is a figure which shows an example. 極間の状態における極間電圧波形と整流回路の出力波形を示す図である。It is a figure which shows the voltage waveform between electrodes in the state between electrodes, and the output waveform of a rectifier circuit.

符号の説明Explanation of symbols

１ ワイヤ電極
２ 被加工物
３ 電圧印加手段
３１ 直流電圧源
３２ａ，３２ｂ，３２ｃ，３２ｄ スイッチング素子
３３ 駆動信号発生器
４ ローパスフィルタ
５ 整流回路
６ 加工槽
７ 加工液
８ 給電子
９ａ，９ｂ 加工電圧供給線
１０ａ，１０ｂ 検出線
１１ 低周波成分検出手段
１１ａ 低周波成分検出信号
１２ 極間
Ｓ１ スイッチング素子３２ａ，３２ｂの駆動信号
Ｓ２ スイッチング素子３２ｃ，３２ｄの駆動信号 DESCRIPTION OF SYMBOLS 1 Wire electrode 2 Work piece 3 Voltage application means 31 DC voltage source 32a, 32b, 32c, 32d Switching element 33 Drive signal generator 4 Low-pass filter 5 Rectifier circuit 6 Processing tank 7 Processing liquid 8 Electric supply 9a, 9b Supply of processing voltage Lines 10a and 10b Detection line 11 Low frequency component detection means 11a Low frequency component detection signal 12 Between electrodes S1 Drive signal for switching elements 32a and 32b S2 Drive signal for switching elements 32c and 32d

Claims (2)

所定の間隙をもって対向配置されたワイヤ電極と被加工物との間である極間に交流高周波電圧を印加して放電を発生させ加工を行うワイヤ放電加工機において、
単一電源で交流高周波電圧に交流低周波成分を重畳する電圧印加手段と、
極間の電圧から交流低周波電圧を検出する低周波成分検出手段と、
を備えたことを特徴とするワイヤ放電加工機。 In a wire electric discharge machine that performs processing by generating an electric discharge by applying an AC high-frequency voltage between the electrodes between a wire electrode and a workpiece that are opposed to each other with a predetermined gap,
Voltage applying means for superimposing an AC low frequency component on an AC high frequency voltage with a single power source;
Low frequency component detection means for detecting an alternating low frequency voltage from the voltage between the poles;
A wire electric discharge machine characterized by comprising: 前記単一電源で交流高周波電圧に交流低周波成分を重畳する電圧印加手段は、
直流電圧源と、
該直流電圧源をワイヤ電極が（＋）、被加工物が（−）の向きに断続的に極間に印加するためのスイッチング素子の組と、
該直流電圧源をワイヤ電極が（−）、被加工物が（＋）の向きに断続的に極間に印加するためのスイッチング素子の組と、
各々のスイッチング素子の組に対し独立に駆動信号を発生させる駆動信号発生器とを備え、スイッチング素子の組を交互に駆動することで交流高周波電圧を極間に印加し、各々のスイッチング素子の組に対し独立にデューティ比を時間変化させることで低周波成分を重畳することを特徴とする請求項１に記載のワイヤ放電加工機。 The voltage applying means for superimposing the AC low frequency component on the AC high frequency voltage with the single power source,
A DC voltage source;
A set of switching elements for applying the DC voltage source intermittently between the wire electrode in the direction of (+) and the workpiece in the direction of (−);
A set of switching elements for applying the DC voltage source intermittently between the wire electrode in the direction of (−) and the workpiece in the direction of (+);
A drive signal generator for generating a drive signal independently for each set of switching elements, and by alternately driving the set of switching elements, an alternating-current high-frequency voltage is applied between the electrodes. The wire electric discharge machine according to claim 1, wherein the low frequency component is superimposed by changing the duty ratio with time independently.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2348208A2 (en) 2010-01-22 2011-07-27 Yamabiko Corporation Two-stroke internal combustion engine and its scavenging method
JP2012161914A (en) * 2012-05-01 2012-08-30 Fanuc Ltd Wire electric discharge machine detecting machining state
US8975554B2 (en) 2010-08-26 2015-03-10 Fanuc Corporation Wire electric discharge machine capable of detecting machining state

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62287916A (en) * 1986-06-03 1987-12-14 Mitsubishi Electric Corp Electric discharge machine
JPS62287917A (en) * 1986-06-03 1987-12-14 Mitsubishi Electric Corp Electric discharge machinine
JPH10244423A (en) * 1997-02-28 1998-09-14 Mitsubishi Electric Corp Power source device for electric discharge finishing machine
JP2004237413A (en) * 2003-02-07 2004-08-26 Mitsubishi Electric Corp Electric discharge machine
JP3842279B2 (en) * 2002-08-30 2006-11-08 三菱電機株式会社 Wire electric discharge machine
JP2007001720A (en) * 2005-06-23 2007-01-11 Fuji Xerox Co Ltd Recording medium carrying device and ink jet recorder

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62287916A (en) * 1986-06-03 1987-12-14 Mitsubishi Electric Corp Electric discharge machine
JPS62287917A (en) * 1986-06-03 1987-12-14 Mitsubishi Electric Corp Electric discharge machinine
JPH10244423A (en) * 1997-02-28 1998-09-14 Mitsubishi Electric Corp Power source device for electric discharge finishing machine
JP3842279B2 (en) * 2002-08-30 2006-11-08 三菱電機株式会社 Wire electric discharge machine
JP2004237413A (en) * 2003-02-07 2004-08-26 Mitsubishi Electric Corp Electric discharge machine
JP2007001720A (en) * 2005-06-23 2007-01-11 Fuji Xerox Co Ltd Recording medium carrying device and ink jet recorder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2348208A2 (en) 2010-01-22 2011-07-27 Yamabiko Corporation Two-stroke internal combustion engine and its scavenging method
US8975554B2 (en) 2010-08-26 2015-03-10 Fanuc Corporation Wire electric discharge machine capable of detecting machining state
JP2012161914A (en) * 2012-05-01 2012-08-30 Fanuc Ltd Wire electric discharge machine detecting machining state

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