WO2010026790A1 - 放電加工機用電源装置 - Google Patents
放電加工機用電源装置 Download PDFInfo
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- WO2010026790A1 WO2010026790A1 PCT/JP2009/054464 JP2009054464W WO2010026790A1 WO 2010026790 A1 WO2010026790 A1 WO 2010026790A1 JP 2009054464 W JP2009054464 W JP 2009054464W WO 2010026790 A1 WO2010026790 A1 WO 2010026790A1
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- electrodes
- power supply
- electric discharge
- discharge machine
- supply device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
- B23H1/022—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges for shaping the discharge pulse train
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H2300/00—Power source circuits or energization
- B23H2300/20—Relaxation circuit power supplies for supplying the machining current, e.g. capacitor or inductance energy storage circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present invention relates to a power supply device for an electric discharge machine that applies a machining voltage between electrodes arranged by opposingly arranged wire electrodes and workpieces, and in particular, electric discharge machining used in finishing machining.
- the present invention relates to a power supply device for a machine.
- the wire electric discharge machining apparatus is an apparatus for machining a workpiece using an arc discharge generated between electrodes composed of a wire electrode and a workpiece arranged to face each other.
- the machining current is gradually reduced from rough machining conditions using a relatively large machining current (for example, a pulse width of about several tens of microseconds).
- the surface roughness is improved by using the finishing process condition that is about several tens of nanoseconds.
- the wire electrical discharge machining device is provided with a switchable power supply device (power supply device for an electrical discharge machine) that can supply machining currents corresponding to various machining conditions ranging from rough machining conditions to finishing machining conditions. There is.
- Patent Documents 1 to 3 Conventionally, various power supply devices for electric discharge machines that improve the surface roughness of a workpiece have been proposed (for example, Patent Documents 1 to 3).
- the DC power supply V1 and one end are connected to the positive terminal of the DC power supply V1 via a line inductance LINE (reactor).
- the switching element S1 connected to one end of the inter-electrode GAP and one end together with the other end of the switching element S1 are connected to the negative end of the DC power source V1, and the other end is connected to the other end of the inter-electrode GAP. Switching element S2.
- the switching element S1 is opened and closed to generate a boosted voltage.
- the boosted voltage charges the stray capacitance Cf and the gap GAP existing in the switching element S2.
- the surface roughness can be improved by a surge-like short pulse current flowing through the gap GAP.
- the current flowing through the gap GAP is limited by the stray capacitance Cf.
- the switching element S2 is turned on to consume the charge stored in the stray capacitance Cf and return to the initial state.
- a capacitor may be provided in parallel with the switching element S2.
- Patent Document 2 discloses a power supply device for an electric discharge machine having a high-frequency power supply having a resonance frequency determined by stray capacitance and inductance between electrodes. Since resonance is used, the voltage generated between the electrodes is not a bipolar pulse voltage but a sine wave voltage.
- Patent Document 3 discloses a technique for obtaining good surface roughness by changing the level of machining current between a positive polarity pulse and a negative polarity pulse. A good surface roughness can be obtained because the discharge state between the electrodes changes depending on whether a positive pulse or a negative pulse is applied.
- Patent Document 1 the reactor is used only for performing chopper control, but it is presumed that a resonant operation is performed with the stray capacitance of the switching element S2 by performing a high-frequency operation.
- a surge-like voltage is generated by the on / off operation of the switching element S1
- a sine wave voltage is not applied between the electrodes as described in Patent Document 2, but a resonance operation is called.
- a distorted waveform voltage with a vibration component is applied. That is, basically, a positive / negative asymmetric voltage pulse as described in Patent Document 3 is applied between the electrodes. This may be considered effective for improving the surface roughness.
- a DC power supply is controlled so as to maintain a constant voltage. If a DC power supply is interposed in the loop of the resonance current, the DC power supply itself may oscillate and lack stability.
- the state between the electrodes is not always constant, from the non-discharge state (impedance value: several tens of k ⁇ to several M ⁇ ) to the discharge state (impedance value: several m ⁇ to several ⁇ ), short circuit state (impedance value: several n ⁇ to (Several m ⁇ ).
- the state between the electrodes in the non-discharge state may be considered as a capacitor having a capacitance between electrodes rather than a resistor.
- the inter-electrode voltage fluctuates more than necessary, and unstable machining is likely to occur.
- the surface roughness tends to deteriorate unnecessarily.
- the present invention has been made in view of the above, and in the case of a DC power source, a switching element, and a reactor, finish processing with high surface roughness that eliminates unstable operation of the DC power source and loss due to internal impedance.
- An object of the present invention is to obtain a power supply device for an electric discharge machine capable of stably performing the above.
- the present invention provides a power supply device for electric discharge machining that applies a pulse voltage between electrodes composed of an electrode and a workpiece, and a DC power supply is connected in series between the electrodes. And a capacitor connected in parallel to a series circuit of the capacitor and between the electrodes, one end connected to one end of the DC power source, one end connected to the other end of the DC power source, and the like A switching element having an end connected to the other end of the reactor.
- the present invention when constituted by a DC power supply, a switching element, and a reactor, unstable operation of the DC power supply and loss due to internal impedance can be eliminated, and finishing with high surface roughness can be stably performed. There is an effect that can be.
- FIG. 1 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram showing an example of a control signal waveform to the switching element shown in FIG. 1 and a voltage waveform applied between the electrodes at that time.
- FIG. 3 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to Embodiment 2 of the present invention.
- FIG. 4 is a diagram showing an example of a control signal waveform to the switching element shown in FIG. 3 and a voltage waveform applied between the electrodes at that time.
- FIG. 5 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to Embodiment 3 of the present invention.
- FIG. 1 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram showing an example of a control signal waveform to the switching
- FIG. 6 is a diagram showing an example of control signal waveforms to a plurality of switching elements shown in FIG. 5 and voltage waveforms applied between the electrodes at that time.
- FIG. 7 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to Embodiment 4 of the present invention.
- FIG. 8 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to the fifth embodiment of the present invention.
- FIG. 9 is a diagram illustrating a configuration example in the case of applying the power supply device for an electric discharge machine shown in FIG. 8 to a wire electric discharge machine.
- FIG. 10 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to Embodiment 6 of the present invention.
- FIG. 1 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to Embodiment 1 of the present invention.
- a power supply device 1a for an electric discharge machine alternately switches a machining voltage suitable for a finishing machining condition between electrodes constituted by a wire electrode 2 and a workpiece 3 arranged opposite to each other by switching the polarity thereof. It is a power supply device that generates an arc discharge necessary for finishing the workpiece 3 between the electrodes.
- the electric power machine 1a for the electric discharge machine and the electrodes are connected by a power cable.
- Lx shown in FIG. 1 indicates the stray inductance. In FIG. 1, only what is present on the workpiece 3 side is shown, but it is also present on the wire electrode 2 side.
- the electric discharge machine power supply device 1a includes a DC power supply V1, a switching element SW1, a reactor L1, and a capacitor C1.
- the switching element SW1 is an FET (field effect transistor), a drain terminal as one end is connected to, for example, a positive end of the DC power supply V1, and a source terminal as the other end is connected to one end of the reactor L1. For example, it is connected to the wire electrode 2.
- a control signal having a switching frequency on the order of MHz is supplied to a gate terminal of the switching element SW1 from a control circuit (not shown).
- Reactor L1 has an inductance value that is in resonance with stray capacitance between electrodes at a frequency on the order of MHz.
- the other end of the reactor L ⁇ b> 1 is connected to the negative electrode end of the DC power source V ⁇ b> 1 and is connected to the workpiece 3.
- the capacitor C1 is selected to have a capacitance value that is in resonance with the stray inductance Lx.
- the capacitor C ⁇ b> 1 is interposed in the connection path between the other end of the reactor L ⁇ b> 1 and the workpiece 3, but may be interposed in the connection path between the one end of the reactor L ⁇ b> 1 and the wire electrode 2.
- a series resonance circuit including a capacitor C1 and a floating inductance Lx is connected in series between the electrodes.
- the capacitor C1 is not necessarily in the form of a so-called capacitor.
- the capacitance between the central conductor and the outer conductor of the coaxial cable may be used, or a necessary capacitance value may be realized by using an insulator (dielectric material) such as a ceramic substrate.
- FIG. 2 is a diagram showing an example of a control signal waveform to the switching element shown in FIG. 1 and a voltage waveform applied between the electrodes at that time.
- a control signal having an on-time width of t1 and an off-time width of s1 is input to the gate terminal of the switching element SW1 from a control circuit (not shown).
- the switching element SW1 performs an opening / closing operation at a high frequency on the order of MHz according to this control pattern.
- a high-frequency voltage having a positive / negative asymmetric waveform such as Vg shown in FIG. 2 is applied between the electrodes by the action of the reactor L1 and the capacitor C1, which will be described later.
- the switching operation frequency of the switching element SW1 is set to a high frequency of, for example, 5 MHz or more, the reactor L1 and the stray capacitance between the electrodes are in a resonance state, and a stable continuous pulse can be applied between the electrodes.
- the capacitor C1 has a constant selected so as to be in resonance with the stray inductance Lx, and is inserted in series between the electrodes. If the capacitor C1 and the floating inductance Lx are in a series resonance state, the resonance current due to the energy generated in the reactor L1 can be ideally supplied between the electrodes without being affected by the floating inductance Lx. As a result, the current pulse flowing between the electrodes can be shortened.
- This resonance current flows between the electrodes and the reactor L1 without passing through the DC power supply V1, so that it is not lost due to the internal impedance of the DC power supply V1. Furthermore, this resonance current has no influence on the DC power supply V1. Thereby, a stable high-frequency pulse can be supplied between the electrodes, and processing with high surface roughness can be stably performed.
- the inductance Lx is floating and may be considered to be very small at least with respect to the reactor L1. If the capacitor C1 having a function of cutting off the direct current component is not inserted into the system, the current of the direct current power source V1 flows between the electrodes at the moment when the switching element SW1 starts the on operation. Depending on the value of the voltage applied between the electrodes, discharge occurs here. The discharge current at this time becomes very large because no resistance is present (no current limiting resistance exists).
- the capacitor C1 if the capacitor C1 is inserted into the system in series, the power supply current is terminated by charging the capacitor C1, so that the voltage between the electrodes is not increased unnecessarily, and the short-circuit current is reduced. It does not continue to flow.
- the capacitor C1 keeps 0V on average between the electrodes.
- the voltage applied between the electrodes is not necessarily subject to positive or negative. That is, the area (charge amount) of the current waveform is subject to positive and negative, but the peak current is distorted as shown in FIG. 2 because it is determined by the on / off timing of the reactor L1 and the switching element SW1 that form the surge pulse. A waveform will be obtained. At this time, improvement in surface roughness can be expected by setting the polarity of the applied voltage so that the peak current is higher in the wire electrode 2 than in the workpiece 3.
- the resonance current generated by the resonance due to the reactor and the stray capacitance between the electrodes does not flow to the DC power supply, and the capacitive load (capacitor C1 or coaxial cable or insulator) ) And the stray inductance are in a resonance state, and can ideally flow between the electrodes.
- the resonance current generated in the reactor does not flow through the DC power supply, the DC power supply does not become unstable, and the resonance current supplied between the electrodes is not lost due to the internal resistance of the DC power supply. Then, a positive and negative asymmetric high-frequency voltage is applied between the electrodes, and the current pulse can be shortened, so that finishing with high surface roughness can be stably performed.
- FIG. FIG. 3 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to Embodiment 2 of the present invention.
- the same reference numerals are given to components that are the same as or equivalent to those shown in FIG. 1 (Embodiment 1).
- the description will be focused on the portion related to the second embodiment.
- a power supply device 1b for an electric discharge machine has a capacitor Cy as a capacitive load in parallel with the electrodes in the configuration shown in FIG. 1 (Embodiment 1).
- a series circuit with a reactor Ly as an inductive load is connected. This series circuit is a circuit that resonates with the stray capacitance between the electrodes.
- the capacitor Cy does not have to be in the form of a so-called capacitor, and is a power supply device other than the power supply device 1b for the electric discharge machine, that is, a power supply device that finishes voltage application between electrodes, such as a power supply device for rough machining It may be.
- the reactor Ly need not be in the form of a so-called reactor, and may be, for example, a stray inductance of a power cable.
- FIG. 4 is a diagram showing an example of a control signal waveform to the switching element shown in FIG. 3 and a voltage waveform applied between the electrodes at that time.
- the difference from FIG. 2 is that the frequency of the voltage Vg applied between the electrodes changes at twice the frequency. This is an example, and the present invention is not limited to this.
- the resonance current does not pass through the DC power supply V1, and thus occurs in the period t1.
- the peak difference between the voltage waveform to be generated and the voltage waveform generated in the period s1 is small, the interelectrode voltage Vg can be applied in the form of a substantially constant voltage, and finishing with high surface roughness can be stably performed. it can.
- the resonant circuit is further connected between the electrodes, the positive and negative asymmetric high-frequency voltage that changes between the electrodes at a frequency equal to or higher than the switching frequency of the switching element (an integer multiple frequency). And the surface roughness can be improved as compared with the first embodiment.
- FIG. 5 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to Embodiment 3 of the present invention.
- the same or similar components as those shown in FIG. 1 (Embodiment 1) are denoted by the same reference numerals.
- the description will focus on the part related to the third embodiment.
- the third embodiment uses a plurality of switching elements connected in parallel and applies a high-frequency voltage of the order of several MHz to several tens of MHz between the electrodes.
- a configuration example is shown.
- FIG. 6 is a diagram showing an example of control signal waveforms to a plurality of switching elements shown in FIG. 5 and voltage waveforms applied between the electrodes at that time.
- the resonance current flowing through the reactor L1 is reduced while lowering the operating frequency of each of the four switching elements SW1 to SW4.
- the synthesis frequency can be increased.
- the switching pattern is varied so as to correct this variation.
- the switching element SW3 is more likely to flow current or has a higher switching speed than the switching elements SW1, SW2, and SW4.
- the on-time width in the period t3 may be shorter than the on-time width in the periods t1, t2, and t4.
- the energy of the reactor L1 becomes uniform at the time of each switching, so that variations can be reduced even with respect to the voltage between the electrodes, and stable workability can be obtained.
- the start timings of the periods s1, s2, and s4 that are the off time widths of the switching elements SW1, SW2, and SW4 may be adjusted.
- the on-time start timing may be shifted back and forth as needed, and at the same time the off-time start timing may be shifted back and forth.
- the interelectrode voltage Vg can be a pulse voltage having a stable period and voltage value.
- the chopper frequency of the reactor can be increased more than the operating frequency of the switching element, it is possible to further increase the frequency between the electrodes.
- the surface roughness can be further improved than 2.
- FIG. 7 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to Embodiment 4 of the present invention.
- the same reference numerals are given to the same or equivalent components as those shown in FIG. 1 (Embodiment 1).
- the description will be focused on the portion related to the fourth embodiment.
- a transformer T1 is provided instead of the reactor L1. That is, one end of the primary side of the transformer T1 is connected to the positive terminal of the DC power source V1 via the switching element SW1, and the other end is connected to the negative terminal of the DC power source. In addition, one end of the secondary side of the transformer T1 is connected to the wire electrode 2 and the other end is connected to the workpiece 3 via the capacitor C1.
- the transformer T1 forms a resonant circuit with the stray capacitance between the electrodes, like the reactor L1.
- the voltage of the DC power supply V1 can be lowered by changing the turns ratio between the primary side and the secondary side of the transformer T1 and reducing the number of turns on the primary side.
- the number of turns on the secondary side of the transformer T1 is selected based on the resonance constant between the stray capacitance between the electrodes and the inductance component of the transformer T1.
- the operation of the switching element SW1 is the same as that of the first embodiment.
- the DC power supply V1 can be insulated, so that the independence between the resonance circuit and the DC power supply V1 is increased.
- the resonance current generated in the resonance circuit of the inductance of the transformer T1 and the stray capacitance between the electrodes does not affect the DC power supply V1, and conversely, the DC power supply V1 is also affected by the resonance current. Therefore, finishing with high surface roughness can be stably performed.
- a plurality of switching elements connected in parallel may be used as shown in the third embodiment.
- a backflow prevention diode may be inserted between the positive terminal of the DC power supply V1 and the drain terminal of the switching element SW1 in FIG.
- FIG. 8 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to the fifth embodiment of the present invention.
- components that are the same as or equivalent to the components shown in FIG. 1 are given the same reference numerals.
- the description will be focused on the portion related to the fifth embodiment.
- a capacitor C2 is additionally inserted on the wire electrode 2 side in the configuration shown in FIG. 1 (the first embodiment). .
- the capacitance value inserted between the reactor L1 and the electrode can ideally be obtained as a combined capacitance value of the capacitors C1 and C2. Accordingly, the capacitance values of the capacitors C1 and C2 can be anything, but when the stray capacitance and the stray inductance Lx are interposed in parallel somewhere in the parallel path, they are inserted into one path between the electrodes.
- the voltage waveform applied between the electrodes can be further optimized by adjusting the capacitance values of the capacitor C1 and the capacitor C2 inserted in the other path between the electrodes.
- FIG. 9 is a diagram illustrating a configuration example in the case of applying the power supply device for an electric discharge machine shown in FIG. 8 to a wire electric discharge machine.
- a machining current is supplied to the wire electrode 2 from the upper and lower portions 2 and 5 through the upper and lower feeders 4 and 5.
- the floating impedance (not shown) is interposed, and the voltage pulse supplied from the upper supply electron 4 and the voltage pulse supplied from the lower supply electron may be different from each other. Conceivable. In this case, a problem such as a decrease in applied voltage may occur.
- an optimum high-frequency waveform can be created by inserting capacitors C21 and C22 corresponding to the capacitor C2 in series near the two feeding points and adjusting the waveform. Also, an optimum high-frequency waveform can be created by inserting a capacitor C11 corresponding to the capacitor C1 on the workpiece 3 side.
- FIG. 10 is a circuit diagram showing a configuration of a power supply device for an electric discharge machine according to Embodiment 6 of the present invention.
- the same reference numerals are given to the same or equivalent components as those shown in FIG. 8 (Embodiment 5).
- the description will focus on the parts related to the sixth embodiment.
- the switching element SW2 is also provided in the path on the negative electrode side of the DC power supply V1. Is provided.
- the interelectrode voltage is desirably a short pulse for high frequency, and desirably a high voltage for obtaining sufficient processing capability. Considering a measure satisfying these requirements from the power supply side, it is to speed up the switching element.
- switching elements SW1 and SW2 are provided in both end paths of the positive electrode side and the negative electrode side of the DC power supply V1.
- the DC power supply V1 and the reactor L1 can be connected and disconnected at high speed, and the excitation voltage generated in the reactor L1 can be increased.
- the voltage generated between the electrodes can be shortened and the voltage can be increased, and better machined surface accuracy can be obtained.
- the power supply device for an electric discharge machine is useful as a power supply device for an electric discharge machine that can stably perform finishing with high surface roughness.
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Abstract
Description
一般的に直流電源は一定電圧を保つように制御されている。共振電流のループに直流電源が介在してしまうと、直流電源自体も発振し、安定性を欠く可能性がある。電極間の状態は、常に一定とは限らず、非放電状態(インピーダンス値:数十kΩ~数MΩ)から放電状態(インピーダンス値:数mΩ~数Ω)、短絡状態(インピーダンス値:数nΩ~数mΩ)といったように、大きく変動するものである。特に、非放電状態での電極間の状態は、抵抗体というよりもむしろ極間容量を有するコンデンサとして考えてよい。ここで、直流電源が発生する発振と電極間が形成するコンデンサとがマッチングしない場合は、極間電圧が必要以上に変動し、不安定な加工となりやすい。あるいはまた不要に面粗度が悪化しやすくなる。
直流電源の内部にはインピーダンスが存在する。共振電流が直流電源の内部を通る構成とすることにより、少なからず損失が生じることになる。また、直流電源の内部インダクタンス成分も共振定数の一部となるため、直流電源の構成や状態が変わることで共振が崩れるので、電極間に所望の共振電流が流れなくなる。このため、安定な加工が得られにくくなる。
2 ワイヤ電極
3 被加工物
V1 直流電源
SW1,SW2,SW3,SW4 スイッチング素子
L1 リアクトル
C1,C2,C11,C21,C22 コンデンサ
Lx 浮遊インダクタンス
Ly リアクトル(誘導性負荷)
Cy コンデンサ(容量性負荷)
T1 トランス
図1は、本発明の実施の形態1による放電加工機用電源装置の構成を示す回路図である。図1において、放電加工機用電源装置1aは、対向配置されるワイヤ電極2と被加工物3とで構成される電極間に仕上げ加工条件に適合した加工用電圧をその極性を切り換えて交互に印加し、電極間に被加工物3の仕上げ加工に必要なアーク放電を生じさせる電源装置である。
図3は、本発明の実施の形態2による放電加工機用電源装置の構成を示す回路図である。なお、図3では、図1(実施の形態1)に示した構成要素と同一ないしは同等である構成要素には同一の符号が付されている。ここでは、本実施の形態2に関わる部分を中心に説明する。
図5は、本発明の実施の形態3による放電加工機用電源装置の構成を示す回路図である。なお、図5では、図1(実施の形態1)に示した構成要素と同一ないしは同等である構成要素には同一の符号が付されている。ここでは、本実施の形態3に関わる部分を中心に説明する。
図7は、本発明の実施の形態4による放電加工機用電源装置の構成を示す回路図である。なお、図7では、図1(実施の形態1)に示した構成要素と同一ないしは同等である構成要素には同一の符号が付されている。ここでは、本実施の形態4に関わる部分を中心に説明する。
図8は、本発明の実施の形態5による放電加工機用電源装置の構成を示す回路図である。なお、図8では、図1(実施の形態1)に示した構成要素と同一ないしは同等である構成要素には同一の符号が付されている。ここでは、本実施の形態5に関わる部分を中心に説明する。
図10は、本発明の実施の形態6による放電加工機用電源装置の構成を示す回路図である。なお、図10では、図8(実施の形態5)に示した構成要素と同一ないしは同等である構成要素には同一の符号が付されている。ここでは、本実施の形態6に関わる部分を中心に説明する。
Claims (20)
- 電極と被加工物とで構成される電極間にパルス電圧を印加する放電加工機用電源装置において、
直流電源と、
前記電極間と直列に接続されるコンデンサと、
前記電極間と前記コンデンサとの直列回路に並列に接続されるとともに、一端が前記直流電源の一端に接続されるリアクトルと、
一端が前記直流電源の他端に接続され、他端が前記リアクトルの他端に接続されるスイッチング素子と
を備えていることを特徴とする放電加工機用電源装置。 - 電極と被加工物とで構成される電極間にパルス電圧を印加する放電加工機用電源装置において、
直流電源と、
前記電極間と直列に接続されるコンデンサと、
一次側の一端が前記直流電源の一端に接続され、二次側が前記電極間と前記コンデンサとの直列回路の両端に接続されるトランスと、
一端が前記直流電源の他端に接続され、他端が前記トランスの一次側の他端に接続されるスイッチング素子と
を備えていることを特徴とする放電加工機用電源装置。 - 前記直流電源の一端と前記リアクトルの一端との間にスイッチング素子が設けられていることを特徴とする請求項1に記載の放電加工機用電源装置。
- 前記コンデンサは、前記電極間の片側経路に直列に設けられている、または、前記電極間の両側経路にそれぞれ直列に設けられていることを特徴とする請求項1に記載の放電加工機用電源装置。
- 前記直流電源の一端と前記リアクトルの一端との間にスイッチング素子が設けられ、前記コンデンサは、前記電極間の片側経路に直列に設けられている、または、前記電極間の両側経路にそれぞれ直列に設けられていることを特徴とする請求項1に記載の放電加工機用電源装置。
- 前記直流電源の一端と前記トランスの一次側の一端との間にスイッチング素子が設けられていることを特徴とする請求項2に記載の放電加工機用電源装置。
- 前記コンデンサは、前記電極間の片側経路に直列に設けられている、または、前記電極間の両側経路にそれぞれ直列に設けられていることを特徴とする請求項2に記載の放電加工機用電源装置。
- 前記直流電源の一端と前記トランスの一次側の一端との間にスイッチング素子が設けられ、前記コンデンサは、前記電極間の片側経路に直列に設けられている、または、前記電極間の両側経路にそれぞれ直列に設けられていることを特徴とする請求項2に記載の放電加工機用電源装置。
- 前記スイッチング素子に代えて、並列接続した複数のスイッチング素子が設けられ、
該複数のスイッチング素子は、各制御端子に所定の順序で開閉動作させる制御信号が供給されることを特徴とする請求項1に記載の放電加工機用電源装置。 - 前記スイッチング素子に代えて、並列接続した複数のスイッチング素子が設けられ、
該複数のスイッチング素子は、各制御端子に所定の順序で開閉動作させる制御信号が供給されることを特徴とする請求項2に記載の放電加工機用電源装置。 - 前記スイッチング素子に代えて、並列接続した複数のスイッチング素子が設けられ、
該複数のスイッチング素子は、互いに、オン時間幅またはオフ時間幅が異なるように制御されることを特徴とする請求項1に記載の放電加工機用電源装置。 - 前記スイッチング素子に代えて、並列接続した複数のスイッチング素子が設けられ、
前記複数のスイッチング素子は、互いに、オン時間幅またはオフ時間幅が異なるように制御されることを特徴とする請求項2に記載の放電加工機用電源装置。 - 前記電極間に並列に、前記電極間の浮遊容量と共振回路を構成する誘導性負荷及び容量性負荷の直列回路が接続されていることを特徴とする請求項1に記載の放電加工機用電源装置。
- 前記電極間に並列に、前記電極間の浮遊容量と共振回路を構成する誘導性負荷及び容量性負荷の直列回路が接続されていることを特徴とする請求項2に記載の放電加工機用電源装置。
- 前記コンデンサに代えて、同軸ケーブルあるいは絶縁物のいずれかを用いることを特徴とする請求項1に記載の放電加工機用電源装置。
- 前記コンデンサに代えて、同軸ケーブルあるいは絶縁物のいずれかを用いることを特徴とする請求項2に記載の放電加工機用電源装置。
- 前記電極間に並列に、前記電極間の浮遊容量と共振回路を構成する誘導性負荷及び容量性負荷の直列回路が接続され、
前記誘導性負荷は、リアクトルまたは前記電極間への電圧供給経路に存在する浮遊インダクタンスであることを特徴とする請求項1に記載の放電加工機用電源装置。 - 前記電極間に並列に、前記電極間の浮遊容量と共振回路を構成する誘導性負荷及び容量性負荷の直列回路が接続され、
前記誘導性負荷は、リアクトルまたは前記電極間への電圧供給経路に存在する浮遊インダクタンスであることを特徴とする請求項2に記載の放電加工機用電源装置。 - 前記電極間に並列に、前記電極間の浮遊容量と共振回路を構成する誘導性負荷及び容量性負荷の直列回路が接続され、
前記容量性負荷は、前記電極間への電圧印加動作を終えた他の電源装置であることを特徴とする請求項1に記載の放電加工機用電源装置。 - 前記電極間に並列に、前記電極間の浮遊容量と共振回路を構成する誘導性負荷及び容量性負荷の直列回路が接続され、
前記容量性負荷は、前記電極間への電圧印加動作を終えた他の電源装置であることを特徴とする請求項2に記載の放電加工機用電源装置。
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JP2010527719A JP5202639B2 (ja) | 2008-09-02 | 2009-03-09 | 放電加工機用電源装置 |
DE112009002139T DE112009002139T5 (de) | 2008-09-02 | 2009-03-09 | Stromversorgungsvorrichtung für eine Elektroerosionsmaschine |
US13/061,719 US8735763B2 (en) | 2008-09-02 | 2009-03-09 | Power supply device for electrical discharge machine |
CN2009801340794A CN102143821B (zh) | 2008-09-02 | 2009-03-09 | 放电加工机用电源装置 |
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US (1) | US8735763B2 (ja) |
JP (1) | JP5202639B2 (ja) |
CN (1) | CN102143821B (ja) |
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WO (1) | WO2010026790A1 (ja) |
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WO2020090073A1 (ja) * | 2018-10-31 | 2020-05-07 | 株式会社牧野フライス製作所 | 放電加工機の電源装置 |
WO2022162785A1 (ja) * | 2021-01-27 | 2022-08-04 | 三菱電機株式会社 | 電源装置 |
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JP5165061B2 (ja) * | 2008-07-24 | 2013-03-21 | 三菱電機株式会社 | 放電加工装置、放電加工方法および半導体基板の製造方法 |
CN103464844B (zh) * | 2013-09-26 | 2015-07-29 | 苏州群伦精密机电工业有限公司 | 一种放电加工电路 |
JP2016123258A (ja) * | 2014-06-02 | 2016-07-07 | パナソニックIpマネジメント株式会社 | スイッチング電源、および、充電装置 |
CN106513878A (zh) * | 2016-12-07 | 2017-03-22 | 上海中轩汽车零部件有限公司 | 一种放电加工实用电源 |
US10298138B2 (en) | 2017-08-31 | 2019-05-21 | Google Llc | Programmable power adapter |
US10277140B2 (en) | 2017-08-31 | 2019-04-30 | Google Llc | High-bandwith resonant power converters |
CN107803563B (zh) * | 2017-12-04 | 2023-12-22 | 北京弘融电子科技有限公司 | 电火花脉冲电源回路 |
CN108672851B (zh) * | 2018-06-08 | 2019-11-08 | 中国工程物理研究院机械制造工艺研究所 | 一种甚高频自振式微能电加工脉冲源 |
TWI779362B (zh) * | 2020-09-30 | 2022-10-01 | 國立虎尾科技大學 | 可調式放電加工電源產生電路以及使用其之放電加工機 |
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CN102143821A (zh) | 2011-08-03 |
DE112009002139T5 (de) | 2012-01-12 |
US20110163071A1 (en) | 2011-07-07 |
JP5202639B2 (ja) | 2013-06-05 |
US8735763B2 (en) | 2014-05-27 |
JPWO2010026790A1 (ja) | 2012-02-02 |
CN102143821B (zh) | 2012-09-12 |
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