WO2006046630A1 - 放電加工用電源装置及び放電加工方法 - Google Patents
放電加工用電源装置及び放電加工方法 Download PDFInfo
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- WO2006046630A1 WO2006046630A1 PCT/JP2005/019759 JP2005019759W WO2006046630A1 WO 2006046630 A1 WO2006046630 A1 WO 2006046630A1 JP 2005019759 W JP2005019759 W JP 2005019759W WO 2006046630 A1 WO2006046630 A1 WO 2006046630A1
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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
- B23H1/024—Detection of, and response to, abnormal gap conditions, e.g. short circuits
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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
Definitions
- the present invention relates to an electric discharge machining apparatus, and more particularly to control of a short-circuit current that flows when a machining electrode and a workpiece are short-circuited.
- a power supply apparatus for electric discharge machining that performs electric discharge machining by intermittently supplying power by intermittently supplying a pulse train that is turned ON / OFF at a predetermined timing in a machining gap between a machining electrode and a workpiece.
- a power supply device for discharging power utilizing charging / discharging of a capacitor is known.
- the DC power source 1 with variable voltage supplies the kale power between the electrode 2 and the object 3 that are oppositely arranged with a minute gap in the machining fluid.
- the pulse signal 8a for driving the switching element from the noise generating circuit 8 when the pulse signal 8a is H, the switching element 4 is turned on and a voltage is applied between the electrode 2 and the driven object 3.
- the pulse signal 8a is L, the switching element 4 is turned off, and voltage application between the electrode 2 and the workpiece 3 is stopped.
- the pulse generation circuit 8 is based on pulse generation conditions such as the pulse ON / OFF time from the pulse generation condition setting unit 9 that can be used by an NC device, the number of pulses in the pulse train, and the pause time between pulse trains. Operate.
- FIGS. 15, 16, and 17 are diagrams showing the relationship between the pulse train from the pulse generation circuit 8, the voltage between the electrodes, and the current between the electrodes.
- FIG. 15 shows a state in which no discharge is generated due to the wide gap between the machining electrode 2 and the workpiece 3 and the current limiting resistor 5 is in a state where the switching element 4 is turned on. While the capacitor 6 is charged with a time constant almost determined by the resistance value and the capacitance of the capacitor 6, and the switching element 4 is OFF, the resistance value of the discharging resistor 7 and the capacitance of the capacitor 6 The charge of the capacitor 6 is discharged through the discharging resistor 7 with a fixed time constant.
- the resistance value of the discharge resistor 7 as shown in the figure is the resistance value of the current limiting resistor 5 for charging. Therefore, even if the switching element 4 is turned OFF, the electric charge of the capacitor 6 does not immediately disappear, and the voltage between the processing electrode 2 and the driven object 3 is 1 pulse in the pulse train. The voltage gradually increases with the first and second pulses, and increases to near the voltage VI of DC power supply 1.
- the pulse pause time is reached, and the voltage between the electrodes gradually decreases to near 0V, and the next pulse train is generated after a predetermined pulse pause time.
- FIG. 15 shows a state in which discharge has occurred in portions A, B, and C.
- A is a state in which a dielectric breakdown occurs between the electrodes during the voltage rise of the third pulse in the pulse train, and a discharge occurs.
- the discharge current value at this time is equal to the discharge current due to the charge charged in the capacitor 6 in the DC power supply.
- the charging current from 1 through the switching element 4, the diode 10 and the charging current limiting resistor 5 is added.
- B shows the state in which electrical breakdown is likely to occur after A, and the electrical discharge has occurred following A because the state has continued.
- the discharge current value at this time is slightly lower than the discharge current value of A because the capacitor 6 was discharged with a slightly low charging voltage.
- C shows a state in which the dielectric breakdown occurs after the interelectrode voltage gradually rises after discharging at B, and the discharge current flows.
- FIG. 17 shows a case where the gap between the electrodes is narrow and short-circuited.
- the voltage of the DC power source 1 is between the electrodes.
- a short-circuit current determined by the resistance value of VI and the current limiting resistor 5 causes an inter-electrode current to flow every time the switching element 4 is driven by the pulse generation circuit 8.
- FIG. 18 is a diagram showing a configuration of a power source device for discharging force using a method in which an AC pulse voltage is applied to a machining gap between a machining electrode and a workpiece.
- the configuration of the DC pulse type power supply device shown in FIG. 14 is configured by arranging a DC power supply device 17 and a switching element 4a having a MOS-FET equivalent force, a current limiting resistor 5a, and a diode 10a. .
- 19, 20, and 21 are diagrams showing the relationship between the pulse train from the pulse generation circuit 8, the voltage between the electrodes, and the current between the electrodes.
- a pulse signal 8b that drives the switching element 4a after a predetermined pause time is generated by the same number of pulses as 8a, and the pulse train 8a and the pulse train 8b have a predetermined pause time. It repeats alternately over time.
- a power supply device for electric discharge machining using an AC pulse system that applies a voltage of both positive and negative polarities to the gap between a similar workpiece and a force electrode is disclosed in, for example, Japanese Patent Laid-Open No. 3-55117. .
- FIG. 19 shows a state in which no discharge is generated due to the wide gap between the machining electrode and the workpiece, and the interelectrode voltage is close to VI while the pulse signal 8a is output. While the pulse signal 8b is output after a saturating time, and the pulse signal 8b is output, the voltage between the electrodes is saturated with a reverse polarity and near V2.
- FIG. 20 shows a state in which discharge has occurred in A, B, C, and D, and the polarity of the discharge current of D is naturally opposite to that of A, B, and C.
- FIG. 21 shows a state where the machining electrode and the workpiece are short-circuited.
- the polarity of the short-circuit current is also reversed every time the polarity of the voltage between the poles is reversed!
- Patent Document 1 Japanese Patent Application Laid-Open No. 3-55117
- the present invention was made to solve these problems.
- the heating is stabilized by appropriately controlling the generation of pulses in the discharge heating power supply device.
- the purpose is to reduce consumption.
- the power supply apparatus for discharging power supplies power by intermittently turning on and off a pulse train that is ONZOFF at a predetermined timing in a machining gap between a machining electrode and a workpiece.
- a short-circuit detecting means for detecting a short-circuit in the machining gap between the machining electrode and the workpiece, and the short-circuit detecting means, Pulse stop means for stopping the generation of a predetermined pulse in the pulse train that stops the supply of power to the machining gap when it is detected that a short circuit has occurred.
- the machining surface does not become rough due to the continuous short-circuit current flowing, the increase in electrode consumption is prevented, and unstable machining can be eliminated.
- FIG. 1 is a configuration diagram of a power supply device for electric discharge machining showing a first embodiment.
- FIG. 2 is an operation timing chart of the configuration of FIG.
- FIG. 3 is a configuration diagram of a power supply device for electric discharge machining showing a second embodiment.
- FIG. 4 is an operation timing chart of the configuration of FIG.
- FIG. 5 is a graph showing the relationship between the number of pulses in a pulse train generated when a short-circuit occurs, the speed of the cathode, and the amount of electrode consumption.
- FIG. 6 is a configuration diagram of a power supply device for electric discharge machining showing a third embodiment.
- FIG. 7 is an operation timing chart of the configuration of FIG.
- FIG. 8 is a configuration diagram of a power supply device for electric discharge machining showing a fourth embodiment.
- FIG. 9 is an operation timing chart of the configuration of FIG.
- FIG. 10 is a configuration diagram of a power supply device for electric discharge machining showing Embodiments 5 and 7.
- FIG. 11 is a configuration diagram of a power supply device for electric discharge machining showing a sixth embodiment.
- FIG. 12 is an operation timing chart of the configuration of FIG.
- FIG. 13 is a configuration diagram of a power supply device for electric discharge machining showing a seventh embodiment.
- FIG. 14 is a configuration diagram of a conventional power supply device for discharging power.
- FIG. 15 is a signal diagram of each part and inter-waveform waveform when the inter-electrode is open in the configuration of FIG.
- FIG. 16 is a waveform diagram between signals and electrodes at each part when discharge occurs in the configuration of FIG.
- FIG. 17 is a waveform diagram of signals and electrodes between the respective parts when the electrodes are short-circuited in the configuration of FIG.
- FIG. 18 is a configuration diagram of a conventional bipolar power supply device for discharge power.
- FIG. 19 is a diagram of signals and waveform between the respective parts when the gap is open in the configuration of FIG.
- FIG. 20 is a waveform diagram between the signals of each part and the electrodes when a discharge occurs in the configuration of FIG.
- FIG. 21 is a signal diagram of each part and a waveform between electrodes when the electrodes are short-circuited in the configuration of FIG.
- Embodiment 1 of the present invention will be described below with reference to the drawings.
- FIG. 1 is a block diagram showing the circuit configuration of an electric discharge machine
- FIG. 2 shows the signals of each part of the configuration shown in FIG. 1 and the voltage and current waveforms between the electrodes.
- reference numeral 1 denotes a DC power source whose voltage VI is variable, and the voltage can be set from the outside by setting means (not shown).
- 2 is a machining electrode
- 3 is a workpiece
- 4 is a switching element such as a MOS-FET
- 10 is a diode
- 5 is a current limiting resistor
- 6 is a heating electrode 2 and a force
- 7 is a resistor for discharging the capacitor 6 with a long time constant
- 8 is a pulse generation circuit for generating a signal for driving the switching element 4
- 9 is NC This is a powerful pulse generation condition setting unit such as a device.
- the pulse train In addition to setting the basic pulse generation conditions such as the pulse on / off time of the pulse train, the number of pulses in the pulse train, the pulse pause time, etc. depending on the processing content, the pulse train previously set the number of pulses generated after detecting the short circuit.
- the discharge pulse generation pattern is set by the force operator that is automatically set based on the basic generation conditions.
- 11 is a short-circuit detection circuit that outputs a signal when the poles are short-circuited.
- 12 is a short-circuit detection circuit.
- 11 A pulse stop circuit that receives a short-circuit detection signal from 1 and outputs an L-level signal for a fixed number of pulses in the pulse train. Then, count the number of pulses generated from the pulse generation circuit 8 and determine the timing to output the L level by comparing it with the number of pulses generated after short circuit detection set by the pulse generation condition setting unit 9.
- the H level is returned to the rest period from the end of the pulse train until the next pulse train is generated.
- Reference numeral 13 denotes an AND circuit which works to prevent the switching element 4 from being driven by masking the pulse signal of the pulse generation circuit 8 while the L level signal is output from the pulse stop circuit 12.
- Fig. 2 The operation example of Fig. 2 is shown in comparison with Fig. 16 of the conventional circuit, and shows the signals of each part in a state where the poles are short-circuited.
- the pulse generator 8 Based on the pulse on / off time, the number of pulses in the pulse train, and the pause time between the pulse trains from the pulse generation condition setting unit 9, the pulse generator 8 has a constant pulse train 8 a (for example, the number of pulses in the pulse train is 8 Occur intermittently.
- the output signal 8 a from the pulse generation circuit 8 is connected to the gate of the switching element 4 through the AND circuit 13.
- One input of the AND circuit 13 is connected to the output of the pulse stop circuit 12. While the pulse stop signal is H, the output signal 8a of the pulse generation circuit is directly used as the on / off signal 13a of the switching element 4, and the pulse stop signal power During this period, the on / off signal 13a of the switching element 4 becomes L, and the switching element 4 is turned off.
- the DC power source 1 When the switching element 4 is turned on, the DC power source 1 includes a diode 10 and a current limiting resistor 5.
- the capacitor 6 and the discharge resistor 7 are connected between the poles of the force electrode 2 and the load 3 and the parallel connection between the poles.
- the switching element 4 is turned on for the pulse on time through the AND circuit 13, and a predetermined voltage is applied between the electrodes.
- a discharge is generated at a predetermined number of pulses, and the workpiece 3 is subjected to electric discharge machining.
- FIG. 2 shows a case where the gap between the electrodes is short-circuited as described above, and in this case, the voltage between the poles hardly occurs.
- the short circuit detection circuit 11 determines whether or not there is a short circuit between the electrodes by, for example, comparing the voltage between the electrodes at the end of the first pulse in the pulse train with a predetermined threshold value.
- the value is close to OV as a value in order to distinguish it from the arc voltage when a discharge occurs from a state where the gap is in an insulated state.
- the short circuit detection circuit 11 When the short circuit detection circuit 11 detects a short circuit, it outputs a short circuit detection signal to the pulse stop circuit 12.
- the pulse stop circuit 12 operates to generate a pulse stop signal (L level) after the timing of the number of pulses predetermined by the pulse generation condition setting unit 9 in response to the short circuit detection signal.
- the pulse stop signal output from the pulse stop circuit 12 is L level, if it is input to one of the AND circuits 13, the pulse 8a from the other pulse generation circuit 8 is masked and the signal output to the switching element 4 is Be blocked.
- the pulse stop signal is not generated during one pulse after short circuit detection, and the pulse stop signal force is set to stop after the second pulse after short circuit detection. Only the first two pulses of the pulse train occur, during which the short-circuit current shown in Figure 2 Force flowing between poles After the third pulse, generation of pulses between poles is stopped, so no pulse voltage is applied across the poles, and no short-circuit current flows.
- the machining surface may be roughened by increasing the short-circuit current, the electrode consumption may be increased, and machining may become unstable. This can prevent the time from becoming long and the fine electrodes from being red-hot or burnt.
- the pulse is stopped after the occurrence of the second pulse after the short circuit is detected at the end of the first pulse in the pulse train. It can be set to stop pulse generation, or conversely, several pulses after short circuit detection can be set to stop the pulse after generating the pulse.
- the degree to which the effect of restoring the insulation by removing the debris between the electrode and the target object in the form of a bridge due to the change in the number of pulses generated at the time of short circuit detection Can be changed.
- the short-circuit detection pulse is not limited to the first pulse in the pulse train, but it can be the second and subsequent pulses.
- FIG. 3 is a configuration diagram showing a circuit configuration of the electric discharge machine in the second embodiment.
- the configuration shown in FIG. 1 includes a DC power source 14 for short circuit detection, a switching element 15 for short circuit detection, a die It consists of an Aode 10b and a short-circuit detection current limiting resistor 16.
- the electrode is detected during the pause time. This is to detect whether or not the power is short-circuited.
- the drive signal 8c which is different from the drive signal 8a, is driven by the pulse generation circuit 8 in order to drive the short-circuiting detection switching element 15 provided separately from the switching element 4 for generating machining pulses. Is output.
- FIG. 4 shows a case where the poles are short-circuited, and the pole-to-pole voltage is close to OV and is in a state.
- the short-circuit detection circuit 11 determines whether the electrodes are short-circuited by a method such as comparing the voltage between the electrodes near the end of the short-circuit detection pulse with a reference voltage close to a predetermined OV. It has become.
- the voltage V3 of the short-circuit detection DC power supply 14 is lower than the voltage VI of the machining DC power supply 1.
- the resistance value of the short-circuit detection current limiting resistor 16 is equal to or larger than the machining current limiting resistor 5.
- the pulse width of each is set to a constant value that is longer than the pulse width of the electric discharge machining pulse.
- the short-circuit detection pulse generation state does not change.
- the sensitivity to detect is not changed.
- the short-circuit detection pulse width does not need to be as short as the on-time of the machining pulse.Therefore, by increasing the pulse width, the inter-electrode voltage is reduced when the electrodes are not short-circuited. Since the voltage rises to near V3 and stabilizes, the difference from the reference voltage for short-circuit detection can be made clearer, and the voltage comparison at the time of short-circuit detection becomes more accurate, so it is possible to distinguish between short-circuit and non-short-circuit. .
- a short-circuit detection pulse can The current flowing through the electrode can prevent the machining surface of the work piece from being roughened by a short-circuit detection pulse with a low peak current, and can also reduce the consumption of the electrode since current is not passed through the electrode more than necessary.
- the short circuit detection circuit 11 detects a short circuit, it outputs a short circuit detection signal to the pulse stop circuit 12.
- the pulse stop circuit 12 operates to generate a pulse stop signal (L level) after the timing of the number of pulses predetermined by the pulse generation condition setting unit 9 in response to the short circuit detection signal.
- the pulse stop signal is at the L level, if it is input to one of the AND circuits 13, the pulse 8a of the other pulse generation circuit 8 force is masked and the signal to the switching element 4 is blocked.
- the pulse stop signal is not generated in the first pulse of the pulse train after the short circuit is detected, and the pulse stop signal is set to L and the pulse is set to stop after the second pulse.
- an electric discharge machine performs a servo that controls the distance between the electrodes by the voltage between the electrodes. Therefore, when a short circuit occurs, it is necessary to retract the electrode quickly until the short circuit is resolved.
- the generation of the machining pulse is masked, so the average value of the interelectrode voltage at the time of the short circuit is surely reduced, so that the electrode can be retracted more quickly and the short circuit can be eliminated quickly. There is an effect that can be.
- the pulse is masked after the first pulse of the pulse train is generated. However, it is set to mask all the pulses in the pulse train after the short circuit is detected, or several pulses are used. Can be set to mask the pulse after it is generated.
- FIG. 5 is an example in which the effect on the machining characteristics by short-circuit current control after short-circuit detection was confirmed by experiments using the electric discharge machining power source according to the second embodiment.
- This case test was applied to a narrow hole discharge machine that uses a tungsten rod with a diameter of 80 ⁇ m as an electrode to make a hole in an iron-based workpiece with a thickness of about 1 mm.
- the number of pulses is 16, the machining voltage is about 200V, the pause time is 10 ⁇ sec, the machining current limiting resistance is 100 ⁇ , and the relationship between the number of pulses generated after short circuit detection (number of pulses that do not stop the pulse), machining time, and electrode wear is shown. ing.
- the optimum number of pulses varies between 1 and several pulses depending on the constant conditions such as the number of pulses in the pulse train, machining voltage, current limiting resistance, and pause time.
- the cause of the continued short-circuit state is thought to be due to the formation of a short-circuit bridge by processing waste that collects due to electromagnetic force generated by the short-circuit current. This is because when the short circuit continues for a predetermined time, a short circuit elimination pulse is generated with a short pulse width to remove the short circuit ply and to solve the short circuit earlier. ing. (See Japanese Patent No. 2967682).
- the short circuit current is greatly reduced to reduce the machining waste.
- the effect of removing the short-circuit bridge while preventing the concentration of the short circuit is considered to have resulted in an increase in the machining speed because the short-circuit state was quickly eliminated.
- the allowable current of the electrode is very small V, so it may be better to not use a short circuit current due to machining pulses at all.
- the force described in the case where the force is applied only by the DC power source 1 This embodiment is a method in which an AC pulse voltage is applied to the machining gap between the machining electrode and the workpiece. This shows an application to a power supply device for the discharge power.
- FIG. 6 is a block diagram showing the circuit configuration of the electric discharge machine in the third embodiment. Compared to FIG. 1 shown in the first embodiment, the DC power source 1 is connected with a polarity opposite to that between the poles. DC power supply 17, switching element 4a, current limiting resistor 5a, diode 10a, AND circuit 13b Is added.
- the bipolar type power supply for the discharge cage has the effect of suppressing the galvanic corrosion phenomenon when the work piece is ionized during the discharge cage. Used in processing machines and some small hole electric discharge machines.
- the pulse stop signal 12a is generated from the noise stop circuit 12 and is input to one of the AND circuits 13 and 13b, as in the first embodiment. Both the pulse train signals 8a and 8b Is prevented from being input to switching elements 4 and 4a.
- both positive polarity and negative polarity are set in advance. Do not generate the above pulses, and do not send a short-circuit current between the poles more than necessary. For this reason, the short-circuit current continues to flow in one place between the electrode and the workpiece, and this has the effect of preventing problems such as rough machining surfaces and abnormal consumption or chipping of the electrodes. In addition, since both positive and negative pulse generation is stopped, the effect of reducing the electrolytic corrosion phenomenon, which is a feature of positive and negative bipolar power supplies, is not impaired!
- this circuit configuration was applied to a fine hole electric discharge machining apparatus using pipe electrodes and rod-shaped electrodes. In this case, it is possible to prevent the machining surface from being roughened by increasing the short circuit current, increasing the amount of electrode consumption, making the machining unstable and increasing the machining time, and preventing the fine electrodes from becoming red hot or burned. is there.
- the number of generated pulses is controlled to be zero even for a pulse train of reverse polarity that has passed through a pause time following the pulse train force detected at the first pulse.
- the broken line in Fig. 7 shows the case where the pulse generation condition setting unit 9 is set so that the number of generated Norse after detection of a short circuit is 2, and two pulses are generated after detection. After that, the pulse generation mask signal is output, and the number of pulses generated becomes 2 due to the reverse polarity pulse train that has passed the pause time from the pulse train that has detected the short circuit! As a result, there is an effect of removing the short-circuited bridge and recovering the insulation state between the poles when the machining waste or the like is interposed in a bridge shape between the electrode and the work piece.
- FIG. 8 shows a configuration in which the configuration described in the second embodiment is combined with a reverse polarity generator as in the third embodiment.
- Fig. 9 shows the signal of each part with the poles short-circuited.
- the pulse generation circuit 8 in the present embodiment includes a signal 8c for driving the switching element 15 for detecting a short circuit during a pause time between pulse trains, and a signal 8a for driving the switching element 4 on the electrode negative polarity side. Then, the signal 8b for driving the switching element 4a on the electrode positive side is generated.
- the signals 8a and 8b are alternately generated for each pulse train and input to one of the AND circuits 13 and 13b.
- the pulse stop circuit 12 When the short circuit detection circuit 11 detects a short circuit based on the voltage between the electrodes at the end of the short circuit detection pulse, the pulse stop circuit 12 generates a pulse stop signal 12a based on the command of the pulse generation condition setting unit 9.
- the drive signals 8a and 8b are prevented from driving the switching elements 4 and 4a while the pulse stop signal is generated by the AND circuits 13 and 13b, the drive signals are the switching element drive signals 13a and 13c. It becomes like this.
- the solid line portion in FIG. 9 shows the case where the number of pulses generated after short circuit detection is set to 0. As a result, no current is caused to flow due to the machining pulse at the time of short circuit between electrodes. Even in the case of machining using an electrode, it is possible to prevent the electrode from being consumed a lot or being red hot or burned by continuing a short-circuit current that does not contribute to machining. Indicates a case where the number of pulses generated after short circuit detection is set to 2 and as a result, a short circuit occurs due to a bridging of processing debris between the electrode and the workpiece. Has the effect of removing the short-circuit bridge and restoring the insulation between the poles.
- FIG. 10 is a configuration diagram illustrating an example of the fifth embodiment.
- the short-circuit detection circuit 11 generates a short-circuit detection signal 18 and sends it to the pulse generation circuit 8 when it detects a short in the machining gap between the machining electrode and the workpiece, and the pulse generation circuit 8
- the short-circuit detection signal 18 is received, for example, the pause time between the pulse train immediately after the short-circuit is detected and the next pulse train is extended to a fixed time, for example, about 2 to several tens of times the set pause time when there is no short-circuit. It is intended to work.
- the present embodiment it is possible to suppress the average current flowing between the electrodes at the time of a short circuit, and therefore, there is an effect that it is possible to prevent problems such as rough machining surfaces and abnormal consumption and chipping of electrodes.
- the short-circuit condition can be quickly eliminated by the effect of preventing the concentration of processing waste.
- FIG. 11 is a configuration diagram illustrating an example of the sixth embodiment.
- a series circuit of the switching element 4b, the diode 10b, and the current limiting resistor 5b is connected in parallel with the series circuit of the switching element 4, the diode 10, and the current limiting resistor 5.
- the pulse generation circuit 8 selectively generates both or either of the switching element drive signals 8a and 8d, and selectively selects both or either of the switching elements 4 and 4b. Can be operated.
- the configuration is such that the magnitude of the pulse current supplied between the electrodes can be changed according to the processing content such as the size of the electrode and the processing status.
- a short circuit detection signal 18 is generated and sent to the pulse generation circuit 8.
- the short-circuit detection circuit 11 detects a short circuit, and the short-circuit detection signal 18 is input to the pulse generation circuit 8 .
- Pulse generation circuit 8 receives short circuit detection signal 18
- the output of 8d out of the pulse generation circuit outputs 8a and 8d is stopped, and only 4 of the switching elements 4 and 4b are operated.
- the current value is reduced.
- the resistance value of resistor 5 and resistor 5b is set to a 2: 1 relationship, the current value at the time of short circuit can be suppressed to 1Z3.
- the present embodiment when the electrodes are short-circuited, it is possible to prevent problems such as rough machining surfaces, abnormal consumption of electrodes, and chipping by reducing the short-circuit current of each pulse. is there.
- FIG. 1 An example of the configuration of the present embodiment is shown in FIG. 1
- the voltage VI of the DC power source 1 and the voltage V2 of the DC power source 17 are normally controlled by the DC voltage control unit 19 based on a command from the pulse generation condition setting unit 9.
- the short-circuit detection circuit 11 When the machining electrode 2 and the workpiece 3 are short-circuited, the short-circuit detection circuit 11 generates a short-circuit detection signal 18 and sends the signal to the DC voltage controller 19.
- the DC voltage control unit 19 is preset in a range of about 0.lm seconds to 10 milliseconds so that the voltage V1 of the DC power supply 1 and the voltage V2 of the DC power supply 17 are set to, for example, 1Z2 of the set voltage. The control is performed for a certain period of time.
- the short-circuit current flowing between the electrodes can be reduced to 1Z2 for a certain period thereafter.
- the present embodiment it is possible to reduce the short-circuit current flowing between the electrodes for a certain period of time by reducing the DC power supply voltage for a certain period of time when a short-circuit occurs, so that a large short-circuit current continues to flow.
- This has the effect of preventing defects such as roughened machined surfaces and abnormal wear or chipping of electrodes.
- this circuit configuration is applied to a fine hole electric discharge machining device using pipe electrodes or rod-shaped electrodes, the machining surface is roughened, the electrode consumption is increased, the machining becomes unstable, the machining time becomes longer, Effective in preventing the electrode from becoming red hot or burning out Industrial applicability
- the present invention is suitable for application to a fine hole electric discharge machining apparatus.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP05799263A EP1806196A4 (en) | 2004-10-28 | 2005-10-27 | VOLTAGE SUPPLY DEVICE FOR SPARK EROSION PROCESSING AND METHOD FOR SPARK EROSION PROCESSING |
US11/666,432 US8168914B2 (en) | 2004-10-28 | 2005-10-27 | Electric-discharge-machining power supply apparatus and electric discharge machining method |
JP2006543236A JP5040312B2 (ja) | 2004-10-28 | 2005-10-27 | 放電加工用電源装置及び放電加工方法 |
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JP2004-313352 | 2004-10-28 | ||
JP2004313352 | 2004-10-28 |
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EP (1) | EP1806196A4 (ja) |
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Cited By (3)
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JP2011189441A (ja) * | 2010-03-12 | 2011-09-29 | Mitsubishi Electric Corp | 放電加工装置 |
JP2011206896A (ja) * | 2010-03-30 | 2011-10-20 | Mitsubishi Electric Corp | 細穴放電加工機及び細穴放電加工方法 |
JP5230848B1 (ja) * | 2012-06-26 | 2013-07-10 | 三菱電機株式会社 | 放電表面処理装置および放電表面処理方法 |
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Also Published As
Publication number | Publication date |
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JP5040312B2 (ja) | 2012-10-03 |
JP2012051107A (ja) | 2012-03-15 |
CN100562394C (zh) | 2009-11-25 |
US20070289949A1 (en) | 2007-12-20 |
CN101065209A (zh) | 2007-10-31 |
JP2011093094A (ja) | 2011-05-12 |
EP1806196A4 (en) | 2010-12-29 |
EP1806196A1 (en) | 2007-07-11 |
JPWO2006046630A1 (ja) | 2008-05-22 |
US8168914B2 (en) | 2012-05-01 |
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