CN113770462B - Wire feeding equipment for wire electric discharge machine - Google Patents
Wire feeding equipment for wire electric discharge machine Download PDFInfo
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- CN113770462B CN113770462B CN202110888120.XA CN202110888120A CN113770462B CN 113770462 B CN113770462 B CN 113770462B CN 202110888120 A CN202110888120 A CN 202110888120A CN 113770462 B CN113770462 B CN 113770462B
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- 208000028659 discharge Diseases 0.000 claims abstract description 34
- 239000002173 cutting fluid Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 17
- 230000000670 limiting effect Effects 0.000 claims abstract description 9
- 230000000630 rising effect Effects 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims description 52
- 230000010355 oscillation Effects 0.000 claims description 8
- 238000003754 machining Methods 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
- 238000007599 discharging Methods 0.000 claims description 2
- 238000009763 wire-cut EDM Methods 0.000 claims 3
- 230000008569 process Effects 0.000 abstract description 14
- 230000003111 delayed effect Effects 0.000 abstract description 4
- 230000036541 health Effects 0.000 abstract description 4
- 239000008213 purified water Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 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
- 230000008859 change Effects 0.000 description 2
- 238000010892 electric spark Methods 0.000 description 2
- 238000004519 manufacturing process Methods 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
- 239000012530 fluid Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- 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
-
- 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 wire-cut electric discharge numerical control wire-moving equipment, wherein a computer client and a near-platform client control a wire-cut Weir system to perform system detection, wire-cut equipment debugging and wire-cut system upgrading, and simultaneously send control signals, a singlechip control box receives the control signals and converts the control signals to transfer, and a drive encoder bus is adopted to control a matched direct current hybrid closed-loop motor to regulate and control external signals and temperature interference. The invention eliminates the step of adding cutting fluid into industrial purified water by pulse discharge design, so that the precision of a workpiece and the surface smoothness are continuously and stably improved in the processing process, and simultaneously, the reduction of discharge and the stop of the addition of the cutting fluid not only protect the environment, but also protect the health of industrial operators, in addition, the impact amplitude of the rising pulse current is delayed by the effect of inductance current limiting, thereby avoiding the impact of overvoltage of a power tube, and further reducing the occurrence probability of secondary discharge in the processing process by matching with the removal of the cutting fluid.
Description
Technical Field
The invention relates to the technical field of electric spark wire-cutting machining, in particular to numerical control wire-cutting equipment for electric spark wire cutting.
Background
At present, a traditional linear cutting machine tool is required to be added with linear cutting fluid when in use, otherwise, effective work cannot be carried out, multiple additives are required to be added in the cutting fluid in order to adapt to processing of various materials, the additives contain multiple toxic components such as nitrite, chromate, chlorine compounds, phenols and the like, the nitrite and alcohol amine are easy to react to form cancerogenic nitrosamine, and for years, the waste liquid treatment of processing enterprises is mainly discharged by direct dumping due to cost and supervision blind areas, so that serious pollution is caused to rivers, farmlands, greening and groundwater for a long time and sustainability, and huge irreparable damage is caused to natural environment.
Meanwhile, a large amount of greasy dirt and toxic pungent smell can be generated in the use process of the cutting fluid, health hazard can occur when the toxic fluid is in direct contact with the skin of a first-line worker, in addition, the linear cutting fluid must be added in the use process of a traditional linear cutting machine tool, and due to the viscosity of the cutting fluid, a mixture is adhered in the processing process to form secondary discharge, so that the precision and the surface finish of a processed workpiece are inconsistent, and the stability is reduced.
In order to solve the problems, a wire-cut electric discharge machine numerical control wire-moving device is provided.
Disclosure of Invention
The invention aims to solve the defects of serious cutting wastewater pollution, easy damage to the health of operators and reduced secondary discharge stability in the prior art, and provides a wire-cut numerical control wire-moving device for electric discharge.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
wire cutting numerical control walks silk equipment includes:
the computer client and the near-platform client control the wire-cutting Weir system to perform system detection, wire-cutting equipment debugging and wire-cutting system upgrading, and simultaneously send out control signals;
the singlechip control box receives the control signal, converts the control signal and transmits the control signal, adopts a drive encoder bus to control and match a direct current hybrid closed-loop motor, and regulates and controls external signals and temperature interference;
the equipment cutting end receives signals, and adopts a high-frequency digital oscillation nanosecond pulse discharge power supply and the setting of a manual self-adaptive digital intelligent sampling loop to remove the addition of cutting fluid;
the working current of the cutting end is fed back in real time, the point flow is controlled through inductance current limiting, and the secondary discharge condition is limited by matching with the cutting fluid removal procedure.
Preferably, the client is divided into a far-end client and a near-platform client, the far-end client transmits control signals through a router, and the near-platform client transmits control signals through direct connection with a singlechip control box.
Preferably, the wire-cut wilt system comprises:
the client control signal transmission module is used for setting and transmitting control signals 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 receives the converted equipment cutting end operation signal and starts the equipment cutting end;
and the linear cutting equipment debugging and operating module is used for operating the linear cutting operating equipment, feeding back an operating path signal to the client, and displaying operating data through the client.
Preferably, the power supply E provides different rectangular pulses for high speed cutting with a cutting efficiency of 20mm per ampere current 2 /min.A, maximum speed up to 70mm 2 /min；
Power supply E provides different rectangular pulses for finishing, cutting efficiency per ampere current of 10mm 2 /min.A, maximum speed up to 35mm 2 /min。
Preferably, the processing waveform of the power supply is a pair of slowly rising and falling waves, and the contrast ratio is high in a high-frequency narrow pulse, wherein the rectangular pulse can be divided into four steps:
t i /t o ；
a.5us/20～40us；
b.10us/40～80us；
c.20us/80～160us；
d.40us/160～320us；
wherein the packet pulse is:
t i /t o 5us/5～10us；
T i /T o 150us/330us；
the voltage peak value of the air-cut gap is;
u i ＝100v；
the short-circuit current is;
rectangular wave I s ＝n×0.7A(t i /t o ＝1/4)；
Packet wave I s ＝n×0.7A(t i /t o ＝5/5)；
The processing current is as follows;
rectangular wave I s ＝n×0.7A(t i /t o ＝1/4)；
Packet wave I s ＝n×0.7A(t i /t o ＝5/5)。
Preferably, the spiral loop resistance R of the inductance L is used in the collector loop, and the rise time constant in the process current is controlled at L/r=2us.
Preferably, the collector i C Through base implantation i B Amplifying, limiting current rise by inductance setting, and discharging energy stored in the inductance by a flywheel diode D to form processing current i when base injection is terminated D Wherein the total processing current is:
i total (S) ＝i C +i D ；
The freewheeling diode D clamps the collector of the power tube on the power supply while releasing electric energy, and the power tube is not impacted by overvoltage when the voltage value is smaller than 100 v.
Preferably, the freewheeling diode D uses an epitaxial wafer, reduces forward resistance through the effect of conductive modulation, improves reverse recovery characteristics without damaging forward characteristics by adding heavy metal diffusion, and simultaneously controls a matched direct current hybrid closed-loop motor through 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 manual self-adaptive digital intelligent sampling loop are adopted in the processing process, so that the situation that a certain proportion of cutting fluid must be added into industrial purified water in the processing process before is avoided, the precision of a workpiece and the surface smoothness in the processing process are continuously and stably improved, and meanwhile, due to the emission reduction and the stop of the addition of the cutting fluid, the environment is protected, and the health of an industrial operator is also protected.
2. The impact amplitude of the rising of the pulse current is delayed through the current limiting effect of the inductor, when the impact of the base electrode is terminated, the final-stage power tube is cut off, and the energy storage effect of the inductor is released through the diode, so that the impact of the overvoltage of the power tube is avoided by continuously forming the processing current, the cutting fluid is matched, and the occurrence probability of secondary discharge in the processing process is reduced.
3. The driving encoder bus is adopted to control and match the direct current hybrid closed loop motor, so that the influence of external signal interference and temperature change on the electric control stability of equipment is effectively reduced, manual operation and automatic operation are realized, the error rate is reduced, in addition, the situation that the existing system cannot be upgraded is solved through the arrangement of a wire-cutting Weir system, the functions of centralized management, remote control, fault self-checking and the like of a plurality of machine tools are realized, the working efficiency of an enterprise administrator is greatly improved, and the production of first-line staff is more standardized.
In summary, the step of adding the cutting fluid into the industrial purified water is omitted through the pulse discharge design, so that the precision of the workpiece and the surface finish in the processing process are continuously and stably improved, meanwhile, due to the reduction of the discharge of the cutting fluid and the stop of the addition, the environment is protected, the health of industrial operators is also protected, in addition, the impact amplitude of the rising of the pulse current is delayed through the effect of inductance current limiting, the impact of the overvoltage of a power tube is avoided, and the occurrence probability of secondary discharge in the processing process is reduced by matching with the removal of the cutting fluid.
Drawings
FIG. 1 is a block diagram of steps of a wire-cut electric discharge machine of the present invention;
FIG. 2 is a block diagram of a wire-cut Will system of a wire-cut electric discharge machine according to the present invention;
FIG. 3 is a processing current pulse diagram of the wire-cut electric discharge machine of the present invention;
fig. 4 is a circuit diagram of a machining circuit of the wire-cut electric discharge machine of the present invention;
fig. 5 is a waveform diagram of a machining current of the wire-cut electric discharge machine according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1, a wire-cut electric discharge machine, comprising:
the computer client and the near-platform client control the wire-cutting Weir system to perform system detection, wire-cutting equipment debugging and wire-cutting system upgrading, and simultaneously send out control signals;
the singlechip control box receives the control signal, converts the control signal and transmits the control signal, adopts a drive encoder bus to control and match a direct current hybrid closed-loop motor, and regulates and controls external signals and temperature interference;
the equipment cutting end receives signals, and adopts a high-frequency digital oscillation nanosecond pulse discharge power supply and the setting of a manual self-adaptive digital intelligent sampling loop to remove the addition of cutting fluid;
the working current of the cutting end is fed back in real time, the point flow is controlled through inductance current limiting, and the secondary discharge condition is limited by matching with the cutting fluid removal procedure.
According to the observation of fig. 1, the client is divided into a far-end client and a near-platform client, the far-end client transmits control signals through a router, and the near-platform client transmits control signals through direct connection with a singlechip control box.
From the observation of fig. 2, the wire-cut wilt system includes:
the client control signal transmission module is used for setting and transmitting control signals 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 receives the converted equipment cutting end operation signal and starts the equipment cutting end;
and the linear cutting equipment debugging and operating module is used for operating the linear cutting operating equipment, feeding back an operating path signal to the client, and displaying operating data through the client.
According to the view of FIG. 3It is observed that the power supply E provides different rectangular pulses for high speed cutting with a cutting efficiency of 20mm per ampere current 2 /min.A, maximum speed up to 70mm 2 /min；
Power supply E provides different rectangular pulses for finishing, cutting efficiency per ampere current of 10mm 2 /min.A, maximum speed up to 35mm 2 /min。
From the observation of fig. 5, the processing waveform of the power supply is a pair wave with slowly rising and falling, and the contrast ratio is higher in the high-frequency narrow pulse, wherein the rectangular pulse can be divided into four steps:
t i /t o ；
a.5us/20～40us；
b.10us/40～80us；
c.20us/80～160us；
d.40us/160～320us；
wherein the packet pulse is:
t i /t o 5us/5～10us；
T i /T o 150us/330us；
the voltage peak value of the air-cut gap is;
u i ＝100v；
the short-circuit current is;
rectangular wave I s ＝n×0.7A(t i /t o ＝1/4)；
Packet wave I s ＝n×0.7A(t i /t o ＝5/5)；
The processing current is as follows;
rectangular wave I s ＝n×0.7A(t i /t o ＝1/4)；
Packet wave I s ＝n×0.7A(t i /t o ＝5/5)。
From the observation of fig. 4, it is seen that the spiral loop resistance R of the inductor L is used in the collector loop, and the rise time constant in the process current is controlled to L/r=2us.
From the observation of FIG. 4, the collector i C Through base implantation i B Amplifying, restricting the current rise by inductance setting,when the base injection is terminated, the energy storage in the inductor is released through the flywheel diode D to form a processing current i D Wherein the total processing current is:
i total (S) ＝i C +i D ；
The freewheeling diode D clamps the collector of the power tube to the power supply while releasing the electric energy, and the power tube is not impacted by overvoltage when the voltage value is smaller than 100 v.
From the observation of fig. 4, it is known that the freewheeling diode D uses an epitaxial wafer, reduces forward resistance by the effect of conduction modulation, improves reverse recovery characteristics without damaging forward characteristics by adding heavy metal diffusion, and simultaneously controls a matching direct current hybrid closed-loop motor by driving an 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 situation that a certain proportion of cutting fluid must be added into industrial purified water during the processing before is avoided, and the precision of a workpiece and the surface smoothness are continuously and stably improved during the processing.
The impact amplitude of the rising of the pulse current is delayed through the current limiting effect of the inductor, when the impact of the base electrode is terminated, the final-stage power tube is cut off, and the energy storage effect of the inductor is released through the follow current diode, so that the impact of the overvoltage of the power tube is avoided by continuously forming the processing current, the cutting fluid is matched, and the occurrence probability of secondary discharge in the processing process is reduced.
The driving encoder bus is adopted to control and match the direct current hybrid closed loop motor, so that the influence of external signal interference and temperature change on the electric control stability of equipment (minus 10-minus 50 degrees) is effectively reduced, the manual operation is realized, the error rate is reduced, in addition, the situation that the existing system cannot be upgraded is solved through the arrangement of the wire-cutting Weill system, the functions of centralized management, remote control, fault self-checking and the like of a plurality of machine tools are realized, the working efficiency of an enterprise administrator is greatly improved, and the production of first-line staff is more standardized.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. Wire cutting numerical control wire moving equipment for wire electric discharge machine comprises the following steps:
the computer client and the near-platform client control the wire-cutting Weir system to perform system detection, wire-cutting equipment debugging and wire-cutting system upgrading, and simultaneously send out control signals;
the singlechip control box receives the control signal, converts the control signal and transmits the control signal, adopts a drive encoder bus to control and match a direct current hybrid closed-loop motor, and regulates and controls external signals and temperature interference;
the equipment cutting end receives signals, and adopts a high-frequency digital oscillation nanosecond pulse discharge power supply and the setting of a manual self-adaptive digital intelligent sampling loop to remove the addition of cutting fluid;
the high-frequency digital oscillation nanosecond pulse discharge power supply provides different rectangular pulses for high-speed cutting, and the cutting efficiency of each ampere of current is 20mm 2 /min.A, maximum speed up to 70mm 2 /min；
The high-frequency digital oscillation nanosecond pulse discharge power supply provides different rectangular pulses for finish machining, and the cutting efficiency of each ampere of current is 10mm 2 /min.A, maximum speed up to 35mm 2 /min；
The processing waveform of the high-frequency digital oscillation nanosecond pulse discharge power supply is a pair wave with slowly rising and falling, and the contrast ratio is higher in a high-frequency narrow pulse, wherein the rectangular pulse can be divided into four steps:
t i /t o ：
a.5us/20～40us；
b.10us/40～80us；
c.20us/80～160us；
d.40us/160～320us；
wherein the packet pulse is:
t i /t o 5us/5～10us；
T i /T o 150us/330us；
the air-cut gap voltage peak is:
u i ＝100v；
the short-circuit current is:
rectangular wave I s ＝n×0.7A，t i /t o ＝1/4；
Packet wave I s ＝n×0.7A，t i /t o ＝5/5；
The processing current is as follows:
rectangular wave I s ＝n×0.7A，t i /t o ＝1/4；
Packet wave I s ＝n×0.7A，t i /t o ＝5/5；
The working current of the cutting end is fed back in real time, the point flow is controlled through inductance current limiting, and the secondary discharge condition is limited by matching with the cutting fluid removal procedure.
2. The wire-cut electric discharge machine numerical control wire-moving equipment according to claim 1, wherein the client is divided into a far-end client and a near-end client, the far-end client transmits control signals through a router, and the near-end client transmits the control signals by directly connecting with a singlechip control box.
3. The wire-cut electrical discharge machining numerical control wire-moving apparatus according to claim 1, wherein the wire-cut wilt system comprises:
the client control signal transmission module is used for setting and transmitting control signals 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 receives the converted equipment cutting end operation signal and starts the equipment cutting end;
and the linear cutting equipment debugging and operating module is used for operating the linear cutting operating equipment, feeding back an operating path signal to the client, and displaying operating data through the client.
4. The wire-cut electric discharge machine of claim 1, wherein the spiral loop resistor R of the inductor L is used in the collector loop, and the rising time constant in the machining current is controlled to L/r=2us.
5. Wire-cut electrical discharge machining numerical control wire-moving apparatus according to claim 1, characterized in that the collector i C Through base implantation i B Amplifying, limiting current rise by inductance setting, and discharging energy stored in the inductance by a flywheel diode D to form processing current i when base injection is terminated D Wherein the total processing current is:
i total (S) ＝i C +i D ；
The freewheeling diode D clamps the collector of the power tube on the power supply while releasing electric energy, and the power tube is not impacted by overvoltage when the voltage value is smaller than 100 v.
6. The wire-cut electrical discharge machining numerical control wire-moving apparatus according to claim 5, wherein the freewheel diode D uses an epitaxial wafer, reduces forward resistance by an effect of conductive modulation, improves reverse recovery characteristics without damaging forward characteristics by adding heavy metal diffusion, and simultaneously controls a matching direct current hybrid closed loop motor by driving an 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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| CN113770462B true CN113770462B (en) | 2023-10-31 |
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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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