CN113770462A - Electric spark wire-electrode cutting numerical control wire traveling equipment - Google Patents
Electric spark wire-electrode cutting numerical control wire traveling equipment Download PDFInfo
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- CN113770462A CN113770462A CN202110888120.XA CN202110888120A CN113770462A CN 113770462 A CN113770462 A CN 113770462A CN 202110888120 A CN202110888120 A CN 202110888120A CN 113770462 A CN113770462 A CN 113770462A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 55
- 238000010892 electric spark Methods 0.000 title description 4
- 208000028659 discharge Diseases 0.000 claims abstract description 28
- 239000002173 cutting fluid Substances 0.000 claims abstract description 22
- 230000000670 limiting effect Effects 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000009763 wire-cut EDM Methods 0.000 claims abstract description 6
- 230000001939 inductive effect Effects 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 238000003754 machining Methods 0.000 claims description 14
- 230000000630 rising effect Effects 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims description 3
- 229910001385 heavy metal Inorganic materials 0.000 claims description 3
- 238000002513 implantation Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000003111 delayed effect Effects 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000006378 damage Effects 0.000 description 3
- 231100000614 poison Toxicity 0.000 description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007096 poisonous effect Effects 0.000 description 2
- 239000008213 purified water Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- -1 alcohol amine Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- XKLJHFLUAHKGGU-UHFFFAOYSA-N nitrous amide Chemical compound ON=N XKLJHFLUAHKGGU-UHFFFAOYSA-N 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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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
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
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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
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses a wire cut electrical discharge machining numerical control wire feeding device, wherein a computer client and a near-platform client control wire cutting Weil system to carry out system detection, debugging of the wire cutting device and upgrading of the wire cutting system, control signals are sent out simultaneously, a single chip microcomputer control box receives the control signals and converts and transmits the control signals, a driving encoder bus is adopted to control a matched direct current mixed closed-loop motor, and external signals and temperature interference are regulated and controlled. The invention eliminates the step of adding cutting fluid into industrial pure water through pulse discharge design, so that the precision of workpieces and the surface finish degree are continuously and stably improved in the processing process, meanwhile, the environment is protected and the health of industrial operators is protected due to the emission reduction and the stop of adding of the cutting fluid, and in addition, the impact amplitude of pulse current rise is delayed through the effect of inductive current limiting, so that the impact of overvoltage of a power tube is avoided, the cutting fluid is removed in a matching manner, and the occurrence probability of secondary discharge in the processing process is reduced.
Description
Technical Field
The invention relates to the technical field of electric spark wire-moving machining, in particular to a numerical control wire-moving device for electric spark wire-moving cutting.
Background
At present, the traditional linear cutting machine tool needs to add linear cutting fluid when in use, otherwise, the traditional linear cutting machine tool cannot effectively work, in order to adapt to various material processing, a plurality of additives need to be added into the cutting fluid, the additives contain a plurality of toxic components, such as nitrite, chromate, chlorine compounds, phenols and other toxic substances, the nitrite and alcohol amine are easy to react to form carcinogenic nitrosamine, and for years, because of the reasons of cost and supervision blind areas, the processing enterprise treatment waste liquid is mainly directly dumped and discharged, which causes long-time and continuous serious pollution to rivers, farmlands, greenery and underground water, and causes huge damage which cannot be compensated to the natural environment.
Simultaneously, can produce a large amount of greasy dirt and poisonous pungent smell at the cutting fluid in the use, healthy harm can appear in the skin direct contact of poisonous liquid and a line staff, in addition, must add the wire cutting fluid in the use of traditional wire cut electrical discharge machine tool, because the viscidity of cutting fluid, the sticky tape mixture forms secondary discharge in the course of working, makes the precision of processing work piece, surface finish appear the inconsistency to lead to stability to descend.
In order to solve the problems, the numerical control wire feeding equipment for the wire cut electrical discharge machining is provided.
Disclosure of Invention
The invention aims to solve the defects of serious pollution of cutting waste water, easy damage to the health of operators and low secondary discharge stability in the prior art, and provides numerical control wire moving equipment for wire cut electrical discharge machining.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wire-cut electric discharge machine with numerical control wire feeding, comprising:
the computer client and the near-desk client control the wire cutting Weil system to carry out system detection, debugging of wire cutting equipment and upgrading of the wire cutting system, and simultaneously send out control signals;
the single chip microcomputer control box receives the control signal, converts the control signal into a control signal and transmits the control signal, and controls the matched direct-current hybrid closed-loop motor by adopting a drive encoder bus to regulate and control external signals and temperature interference;
the equipment cutting end receives signals, and the addition of cutting fluid is removed by adopting a high-frequency digital oscillation nanosecond pulse discharge power supply and the arrangement of a manual self-adaptive digital intelligent sampling loop;
the working current of the cutting end is fed back in real time, the point flow is controlled through inductive current limiting, and the secondary discharge condition is limited by matching with the removal process of the cutting fluid.
Preferably, the client is divided into a far-end client and a near-station client, the far-end client transmits the control signal through the router, and the near-station client transmits the control signal through direct connection with the single-chip microcomputer control box.
Preferably, the wire-cutting weir system comprises:
the client control signal transmission module is used for setting and transmitting a control signal by the client processor;
the single chip microcomputer control box receives the control signal and converts the PWM signal into an equipment cutting end operation signal;
the equipment cutting end operation signal receiving module is used for receiving the converted equipment cutting end operation signal and starting the equipment cutting end;
and the wire cutting operation equipment operates and feeds back an operation path signal to the client, and operation data is displayed through the client.
Preferably, the power source E provides different square pulses for high speed cutting with a cutting efficiency of 20mm per ampere of current2Min. A, maximum speed up to 70mm2/min；
Power supply E provides different square pulses for finishing with a cutting efficiency of 10mm per ampere of current2Min. A, maximum speed up to 35mm2/min。
Preferably, the processing waveform of the power supply is a slow rising and falling counter wave, the contrast is higher in high-frequency narrow pulses, and the rectangular pulses can be divided into four stages:
ti/to；
a.5us/20～40us；
b.10us/40～80us；
c.20us/80～160us；
d.40us/160～320us；
wherein, the grouping pulse is:
ti/to 5us/5～10us；
Ti/To 150us/330us；
the voltage peak value of the air-break gap is;
ui＝100v；
the short-circuit current is;
rectangular wave Is＝n×0.7A(ti/to＝1/4)；
Packet wave Is＝n×0.7A(ti/to＝5/5)；
The processing current is;
rectangular wave Is＝n×0.7A(ti/to＝1/4)；
Packet wave Is＝n×0.7A(ti/to＝5/5)。
Preferably, a spiral ring resistor R of an inductor L is adopted in a collector loop, and the rising time constant in the machining current is controlled to be L/R2 us.
Preferably, the collector iCBy base implantation of iBAmplifying, limiting the current rise through the inductor, releasing the stored energy in the inductor through a freewheeling diode D when the base injection is terminated, and forming a processing current iDWherein the total process current is:
igeneral assembly＝iC+iD；
The freewheeling diode D clamps the collector of the power tube to the power supply while releasing the electric energy, and when the voltage value is less than 100v, the power tube is not impacted by overvoltage.
Preferably, the freewheeling diode D uses an epitaxial wafer, reduces a forward resistance by an effect of conductive modulation, improves a reverse recovery characteristic without damaging a forward characteristic by additional heavy metal diffusion, and controls a matching dc hybrid closed-loop motor by driving an encoder bus.
Compared with the prior art, the invention has the beneficial effects that:
1. the high-frequency digital oscillation nanosecond pulse discharge power supply and the artificial self-adaptive digital intelligent sampling loop are arranged in the machining process, so that the situation that a certain proportion of cutting fluid is added into industrial purified water in the machining process in the prior art is avoided, the workpiece precision and the surface finish degree are continuously and stably improved in the machining process, and meanwhile, due to the fact that the cutting fluid is reduced in emission and stopped being added, the environment is protected, and the health of industrial operators is also protected.
2. Through the effect of inductance current limiting, the impact amplitude that pulse current rises has been delayed, and when base impact was stopped, the last power tube was cut off, because the energy storage effect of inductance, released through the diode, thereby continued to form the impact of processing current overvoltage of power tube, and then the removal of cooperation cutting fluid has reduced the appearance probability that secondary discharge appears in the course of working.
3. Adopt drive encoder bus control to match the mixed closed loop motor of direct current, the effectual influence that has reduced external signal interference and temperature variation to the automatically controlled stability of equipment to realize manual-automatic operation, reduced the error rate, in addition, through the setting of wire-electrode cutting well system, the unable circumstances of upgrading of current system has been solved, and realize functions such as centralized management, remote control, trouble self-checking to many lathe, the work efficiency of enterprise's administrator has greatly been improved, make the production of an organic whole staff more standardized.
In conclusion, the invention eliminates the step of adding the cutting fluid into the industrial pure water through the pulse discharge design, so that the precision of the workpiece and the surface finish quality are continuously and stably improved in the machining process, meanwhile, the environment is protected and the health of industrial operators is protected due to the emission reduction and the stop of the addition of the cutting fluid, and in addition, the impact amplitude of the pulse current rise is delayed through the inductive current limiting effect, so that the impact of the overvoltage of a power tube is avoided, and the occurrence probability of secondary discharge in the machining process is reduced by matching with the removal of the cutting fluid.
Drawings
FIG. 1 is a block diagram of the steps of a wire-cut electric discharge machining numerical control wire feeding device provided by the invention;
FIG. 2 is a block diagram of a wire-electrode cutting Weir system of the numerical control wire-cut electrical discharge machining device provided by the invention;
FIG. 3 is a machining current pulse diagram of a numerical control wire-moving device for electrospark wire-electrode cutting according to the present invention;
FIG. 4 is a circuit diagram of a processing circuit of a wire-cut electrical discharge machining numerical control wire feeding device according to the present invention;
fig. 5 is a waveform diagram of a machining current of a numerical control wire-moving device for electrospark wire-electrode cutting.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, a wire electric discharge machining numerical control wire feeding apparatus includes:
the computer client and the near-desk client control the wire cutting Weil system to carry out system detection, debugging of wire cutting equipment and upgrading of the wire cutting system, and simultaneously send out control signals;
the single chip microcomputer control box receives the control signal, converts the control signal into a control signal and transmits the control signal, and controls the matched direct-current hybrid closed-loop motor by adopting a drive encoder bus to regulate and control external signals and temperature interference;
the equipment cutting end receives signals, and the addition of cutting fluid is removed by adopting a high-frequency digital oscillation nanosecond pulse discharge power supply and the arrangement of a manual self-adaptive digital intelligent sampling loop;
the working current of the cutting end is fed back in real time, the point flow is controlled through inductive current limiting, and the secondary discharge condition is limited by matching with the removal process of the cutting fluid.
According to the observation of fig. 1, the client is divided into a far-end client and a near-station client, the far-end client transmits the control signal through the router, and the near-station client transmits the control signal through direct connection with the single chip microcomputer control box.
From the observation of fig. 2, it can be seen that the wire cutting well system comprises:
the client control signal transmission module is used for setting and transmitting a control signal by the client processor;
the single chip microcomputer control box receives the control signal and converts the PWM signal into an equipment cutting end operation signal;
the equipment cutting end operation signal receiving module is used for receiving the converted equipment cutting end operation signal and starting the equipment cutting end;
and the wire cutting operation equipment operates and feeds back an operation path signal to the client, and operation data is displayed through the client.
From the observation of FIG. 3, it can be seen that the power supply E provides different square pulses for high speed cutting with a cutting efficiency of 20mm per ampere of current2Min. A, maximum speed up to 70mm2/min；
Power supply E provides different square pulses for finishing with a cutting efficiency of 10mm per ampere of current2Min. A, maximum speed up to 35mm2/min。
According to the observation of fig. 5, the processing waveform of the power supply is a counter wave with slow rising and falling, the contrast ratio is higher in high-frequency narrow pulses, and rectangular pulses can be divided into four steps:
ti/to；
a.5us/20～40us；
b.10us/40～80us；
c.20us/80～160us；
d.40us/160～320us；
wherein, the grouping pulse is:
ti/to 5us/5～10us；
Ti/To 150us/330us；
the voltage peak value of the air-break gap is;
ui＝100v；
the short-circuit current is;
rectangular wave Is＝n×0.7A(ti/to＝1/4)；
Packet wave Is＝n×0.7A(ti/to＝5/5)；
The processing current is;
rectangular wave Is＝n×0.7A(ti/to＝1/4)；
Packet wave Is＝n×0.7A(ti/to＝5/5)。
According to fig. 4, it is observed that the spiral loop resistance R of the inductor L is used in the collector loop, and the rising time constant in the machining current is controlled to be 2 us/R.
From the observation of FIG. 4, the collector iCBy base implantation of iBAmplifying, limiting the current rise through the inductor, releasing the stored energy in the inductor through a freewheeling diode D when the base injection is terminated, and forming a processing current iDWherein the total process current is:
igeneral assembly＝iC+iD；
The freewheeling diode D clamps the collector of the power tube to the power supply while releasing the electric energy, and when the voltage value is less than 100v, the power tube is not impacted by overvoltage.
It can be observed from fig. 4 that the freewheeling diode D uses an epitaxial wafer, reduces the forward resistance by the effect of the conductive modulation, improves the reverse recovery characteristic without damaging the forward characteristic by additional heavy metal diffusion, and controls the matching dc hybrid closed-loop motor by driving the encoder bus.
The specific embodiment of the invention is as follows:
the high-frequency digital oscillation nanosecond pulse discharge power supply and the artificial self-adaptive digital intelligent sampling loop are adopted during processing, so that the phenomenon that a certain proportion of cutting fluid is added into industrial purified water in the processing process before is avoided, and the workpiece precision and the surface finish quality are continuously and stably improved in the processing process.
Through the effect of inductance current limiting, the impulse amplitude that pulse current rises has been delayed, and when base impact was stopped, the last power tube was cut off, because the energy storage effect of inductance, released through freewheeling diode to thereby continue to form the impact of processing current thereby avoided the power tube overvoltage, and then the removal of cooperation cutting fluid has reduced the appearance probability that secondary discharge appears in the course of working.
Adopt drive encoder bus control to match the mixed closed loop motor of direct current, the effectual influence (minus 10 degrees-plus 50 degrees) that has reduced external signal interference and temperature variation to the automatically controlled stability of equipment to realize manual-automatic operation, reduced the error rate, in addition, through the setting of line cutting well system, the condition that current system can't be upgraded has been solved, and realize functions such as centralized management, remote control, trouble self-checking to many lathe, the work efficiency of enterprise administrator has greatly been improved, make the production of a ray of staff more standardized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A wire cut electrical discharge machining numerical control wire traveling device comprises the following steps:
the computer client and the near-desk client control the wire cutting Weil system to carry out system detection, debugging of wire cutting equipment and upgrading of the wire cutting system, and simultaneously send out control signals;
the single chip microcomputer control box receives the control signal, converts the control signal into a control signal and transmits the control signal, and controls the matched direct-current hybrid closed-loop motor by adopting a drive encoder bus to regulate and control external signals and temperature interference;
the equipment cutting end receives signals, and the addition of cutting fluid is removed by adopting a high-frequency digital oscillation nanosecond pulse discharge power supply and the arrangement of a manual self-adaptive digital intelligent sampling loop;
the working current of the cutting end is fed back in real time, the point flow is controlled through inductive current limiting, and the secondary discharge condition is limited by matching with the removal process of the cutting fluid.
2. The wire cut electric discharge machine according to claim 1, wherein the client is divided into a far-end client and a near-station client, the far-end client transmits the control signal through a router, and the near-station client transmits the control signal through direct connection with a single chip microcomputer control box.
3. A wire-cut electric discharge machine according to claim 1, characterized in that said wire-cut waler system comprises:
the client control signal transmission module is used for setting and transmitting a control signal by the client processor;
the single chip microcomputer control box receives the control signal and converts the PWM signal into an equipment cutting end operation signal;
the equipment cutting end operation signal receiving module is used for receiving the converted equipment cutting end operation signal and starting the equipment cutting end;
and the wire cutting operation equipment operates and feeds back an operation path signal to the client, and operation data is displayed through the client.
4. A wire-cut electric discharge machine according to claim 1, characterized in that the power source E provides different rectangular pulses for high-speed cutting with a cutting efficiency of 20mm per ampere of current2Min. A, maximum speed up to 70mm2/min；
Power supply E provides different square pulses for finishing with a cutting efficiency of 10mm per ampere of current2Min. A, maximum speed up to 35mm2/min。
5. The wire-cut electric discharge machine according to claim 4, wherein the machining waveform of the power supply is a slow rising and falling counter wave, the contrast is high in high-frequency narrow pulses, and the rectangular pulses can be divided into four steps:
ti/to；
a.5us/20～40us；
b.10us/40～80us；
c.20us/80～160us；
d.40us/160～320us；
wherein, the grouping pulse is:
ti/to 5us/5～10us；
Ti/To 150us/330us；
the voltage peak value of the air-break gap is;
ui＝100v；
the short-circuit current is;
rectangular wave Is＝n×0.7A(ti/to＝1/4)；
Packet wave Is＝n×0.7A(ti/to＝5/5)；
The processing current is;
rectangular wave Is＝n×0.7A(ti/to＝1/4)；
Packet wave Is＝n×0.7A(ti/to＝5/5)。
6. The wire-cut electric discharge machine according to claim 1, wherein a spiral ring resistance R of an inductance L is adopted in a collector circuit, and a rising time constant in a machining current is controlled to be L/R2 us.
7. The wire-cut electric discharge machine according to claim 1, wherein the collector i is a wire-cut electric discharge machineCBy base implantation of iBAmplifying, limiting the current rise through the inductor, releasing the stored energy in the inductor through a freewheeling diode D when the base injection is terminated, and forming a processing current iDWherein the total process current is:
igeneral assembly＝iC+iD；
The freewheeling diode D clamps the collector of the power tube to the power supply while releasing the electric energy, and when the voltage value is less than 100v, the power tube is not impacted by overvoltage.
8. The wire-cut electric discharge machine according to claim 7, wherein the freewheeling diode D uses an epitaxial wafer, reduces the forward resistance by the effect of the conductive modulation, improves the reverse recovery characteristic without damaging the forward characteristic by additional heavy metal diffusion, and controls the matching DC hybrid closed-loop motor by driving the encoder bus.
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|---|---|---|---|
| CN202110888120.XA CN113770462B (en) | 2021-08-03 | 2021-08-03 | Wire feeding equipment for wire electric discharge machine |
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|---|---|---|---|
| CN202110888120.XA CN113770462B (en) | 2021-08-03 | 2021-08-03 | Wire feeding equipment for wire electric discharge machine |
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2021
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| CN108380988A (en) * | 2018-01-30 | 2018-08-10 | 南京理工大学 | A kind of WEDM pulse power supply and its control method |
| CN108723531A (en) * | 2018-07-06 | 2018-11-02 | 南京航空航天大学 | Between Wire EDM arteries and veins or the pulsewidth PID control constant current probability pulse power |
| CN213257561U (en) * | 2020-06-14 | 2021-05-25 | 南京航空航天大学 | High-speed reciprocating wire-moving electrospark wire-electrode cutting filament cutting discharge state identification system |
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