CN106825806A - A kind of device and method in the curved hole of introduction by magnetic field electrolysis electric spark Compound Machining - Google Patents
A kind of device and method in the curved hole of introduction by magnetic field electrolysis electric spark Compound Machining Download PDFInfo
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- CN106825806A CN106825806A CN201710197211.2A CN201710197211A CN106825806A CN 106825806 A CN106825806 A CN 106825806A CN 201710197211 A CN201710197211 A CN 201710197211A CN 106825806 A CN106825806 A CN 106825806A
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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
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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
- B23H7/14—Electric circuits specially adapted therefor, e.g. power supply
- B23H7/18—Electric circuits specially adapted therefor, e.g. power supply for maintaining or controlling the desired spacing between electrode and workpiece
-
- 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
- B23H7/36—Supply or regeneration of working media
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- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses a kind of device and method in the curved hole of introduction by magnetic field electrolysis electric spark Compound Machining, the present invention belongs to special process field manufacturing technology suitable for the microfabrication of non-magnet material；Guided rings include left and right sides calutron in the device and method, and left and right calutron produces anisotropy field, guided rings to continue to export magnetic field force to electrode in being arranged on slide rail by digital stable power on-load voltage；Tool-electrode produces pivot angle because magnetic field force induced in universal joint, and flexible rubber hose feeds in the case where feeding motor vertically drives with tool-electrode swaying direction, and tool-electrode electrochemical discharge is in this direction ablation workpiece material；Electrolyte is delivered to flexible rubber hose by circulating pump in device, and flow to electrode by the reserved micropore of universal joint, reaches the purpose of chip removal and supplement electrolyte；Device Computer controls the rotating speed and corner and the feed speed of feeding motor vertically of corner stepper motor by control card by adjusting the output voltage control magnetic field intensity of digital stable power.
Description
Technical field
The present invention relates to the special process field in manufacturing technology, a kind of introduction by magnetic field electrolysis electric spark Compound Machining is refered in particular to
The device and method in curved hole.
Background technology
With industrial expansion and growth in the living standard, people are continuously increased to high-precision injection molding part demand, and this is just
There is requirement higher to mould and die accuracy in injection mold industry.But accurate temperature control is but into injection in cooling procedure
Mould and die accuracy continues the obstacle for improving, current study show that the mould with curved hole cooling duct is compared with cooling duct mould is combined,
The features such as with long working life, accurate temperature control and good injection-moulded plastic part quality, but the processing in the curved hole of cooling duct is one
The problem that can't steer clear of.If the processing problems in the curved hole of cooling duct are resolved, then precise injection molding industry will welcome new development
Opportunity.
On the other hand, MEMS refers in one by the sensing technology of micro-structural, actuation technology and Controlled by micro computer Integration ofTechnology
Body, forms the intelligent micro device or system with " sensing~calculate (control)~execution " function.MEMS leads to
Miniaturization is crossed with integrated to build microcosmic new structure, new operation principle, new function, in micro-nano sensor, micro- execution
The aspects such as device, Micro-Robot, microreactor technology, microkinetic energy resource system, micro-biochip have application, and these applications must
Must be premised on corresponding process technology, because MEMS usually needs to produce micropore, two dimension on material or even answers
The micro-structurals such as miscellaneous three-dimensional die cavity, as circuit between system or the passage of fluid.So if without ripe curved hole machined work
Skill, the large-scale industrial application of MEMS can only be talked about stratagems on paper.
Due to being limited by spatial constructional dimensions, traditional process tool cannot be introduced into the inside of bent hole, cause curved
The inner surface in hole is difficult to, and is even more and has no way of doing it for finishing and its finishing.Even manpower handwork, also it is stranded very much
Difficulty, this brings very big technological challenge for the machining of bending internal surface of hole.Thus, this technical barrier of curved hole machined is also got over
More to be paid close attention to by academia.Since the eighties in last century, just there are experts and scholars to be devoted to the research of curved hole machined technology,
More is using the method for the special process, wherein using spark discharge ablation method mostly.
The processing of spark discharge ablation is, respectively using workpiece and instrument as two electrodes, to be put using two interpolar pulse sparks
The heat energy that electricity is produced, melt, evaporate and dish out piece pole material, reaches the purpose of processing workpiece.Current spark discharge erosion
Mainly have except curved hole method is processed：Using the spring in compressive state with different curvature bending elongation driving electrodes processing method,
Make the method for curved guide using marmem, use flexible electrical cartridge electrochemical machining method etc..Using in compression shape
The spring of state can in the predetermined direction process curved hole with different curvature bending elongation driving electrodes processing method, but exist
Processing efficiency is low and problem of spring random vibration, so as to influence the roughness and precision in processed hole.Remembered using shape
The principle for recalling the method foundation memorial alloy temperature distortion that alloy makees curved guide can also process curved hole, but electricity in process
Cartridge easily unstability, the quality for processing shape, precision and the inner surface in curved hole all cannot be guaranteed.The electrolysis of flexible electrical cartridge adds
Work method makes flexible pipe turn by the recoil strength of the pulling force or electrolyte that change current supply line, so as to control flexible electrical cartridge to add
Work goes out curved hole, and this square law device is simple, low cost, process are relatively easily controlled, but still suffers from processing gap and be difficult to control
System, the shortcoming of easily short circuit.
The content of the invention
The invention aims to solve above-mentioned difficulty, it is proposed that a kind of introduction by magnetic field is electrolysed electric spark Compound Machining
Curved aperture apparatus and method, using steel electrode, the stress in magnetic field swings the present invention, and flexible rubber hose elastically deformable is with to electrode
Swaying direction feed, tool-electrode separated by the gas-bearing formation that cell reaction is produced occur electrochemical discharge thus ablation material principle
Carry out curved hole machined.Guided rings persistently export magnetic field force, coordination electrode pivot angle simultaneously, and constantly be delivered to for electrolyte and add by circulating pump
Work area domain, it is ensured that the sustainability of processing.
To achieve these goals, the invention provides a kind of introduction by magnetic field electrolysis curved aperture apparatus of electric spark Compound Machining,
Including electrolysis EDM System, guiding magnetic field control system and electrolyte circulation system；The electrolysis electrical discharge machining system
System includes feeding motor, tool-electrode, universal joint, adjustable pulsed power supply, auxiliary electrode, control card and computer vertically；Institute
Tool-electrode is stated to be connected with the flexible rubber hose lower end in electrolyte circulation system by universal joint；The flexible rubber hose and universal joint
Junction offers micropore；The tool-electrode connects adjustable pulsed power supply negative pole, the auxiliary electrode connection adjustable pulse electricity
Source positive pole, in the tank that the auxiliary electrode is placed in guiding magnetic field control system；Vertical feeding motor and the control
Card is connected, and the control card is connected with the computer；Described guiding magnetic field control system includes that guided rings, corner are walked
Stepper motor, vertically feeding motor, connecting rod, digital stable power, slide rail, tank；The guided rings are arranged on slide rail madial wall
And can be slided along slide rail, guided rings are connected by connecting rod with the corner stepper motor, and guided rings can be by connecting rod with corner
Stepper motor is rotated；The slide rail is arranged on bottom of gullet, and the corner stepper motor is arranged on the vertical feeding motor
And be connected with computer by the control card；The electrolyte circulation system includes flexible rubber hose, circulating pump, electrolyte；
Be delivered to electrolyte in the flexible rubber hose by the circulating pump, and the flexible rubber hose is placed in the surface of guided rings；It is described soft
Electrolyte in property sebific duct flows to machining area through the micropore.
Further, there is workpiece below the flexible rubber hose, workpiece is placed in tank.
Further, the workpiece is non-magnet material, and the tool-electrode is steel tapered electrode, the auxiliary electrode
It is graphite electrode, the electrolyte is alkaline solution, the tool-electrode need to immerse electrolyte, the flexible rubber hose a diameter of 1
~5mm and elastic deformation can occur, the adjustable pulsed power supply voltage 0~60V, 1~5000Hz of frequency, dutycycle 0~
100%.
Further, the universal joint envelope tool-electrode taper bottom surface, the tool-electrode can be in the universal joint
Freely swing.
Further, the guided rings include left side calutron and right side calutron；The left side calutron with
Right side calutron radial symmetric and by the digital stable power on-load voltage produce anisotropy field, the digital stable power
Output voltage is by computer controls.
Further, the computer by the control card control the rotating speed and corner of the corner stepper motor with
And the feed speed of the vertical feeding motor.
Further, the tool-electrode by magnetization treatment, conical lower portion and top magnetic conversely, taper be 1:2~
1:8, magnetic is opposite so that the bearing up-down force of tool-electrode is different, so as to be conducive to the formation in curved hole.
The method of the curved aperture apparatus of electric spark Compound Machining is electrolysed based on introduction by magnetic field, is comprised the following steps：
Step S1：Adjustable pulsed power supply is connected and on-load voltage with tool-electrode and auxiliary electrode respectively, numerical control is steady
Voltage source is connected with guided rings, by computer controls digital stable power output voltage；
Step S2：There is electrochemical discharge ablation material in tool-electrode, and the left side calutron in guided rings is electric with right side
By producing anisotropy field after the digital stable power on-load voltage, guided rings are rotated magnetic device with corner stepper motor, instrument
Electrode by directional magnetic field power because being produced pivot angle；
Step S3：Feeding motor drives flexible rubber hose to point to feeding, instrument with tool-electrode vertically under the control of the computer
Electrode is towards swaying direction ablation material；
Step S4：Database is set up, according to the different vertical feed speeds of the different settings of the workpiece material, according to instrument
The size of electrode sets the different output voltage of digital stable power；
Step S5：In electrochemical discharge process, the electrolyte in tank is delivered to flexible glue by the circulating pump
Guan Zhong, electrolyte flow to machining area through micropore.
Further, in the step S1, the guided rings can up and down, circumferentially be slided in slide rail, be protected with tool-electrode
Hold sustained height.
Further, in the step S3, the flexible rubber hose is resiliently flexible so as to be fed to the curved hole direction of workpiece.
Technical proposal that the invention solves the above-mentioned problems is：
1. electrolysis EDM System is set up, and after tool-electrode and auxiliary electrode on-load voltage, tool-electrode is produced
Electrochemical discharge, vertical stepper motor makes flexible rubber hose be pointed to tool-electrode very near under the control of the computer to lower feeding, and
Make tool-electrode in this direction ablation workpiece material.
2. guiding magnetic field control system, after digital stable power is to guided rings on-load voltage, left and right sides electromagnetic installing are set up
Generation anisotropy field is put, guided rings go to required angle under corner stepper motor driving, so that tool-electrode directional swing.
3. electrolyte circulation system is set up, and electrolyte in tank is constantly delivered to flexible glue by circulating pump in process
Pipe, electrolyte flows to tool-electrode machining area through micropore.
Present invention has the advantages that：
1., by being electrolysed EDM System, the processing gap between tool-electrode and workpiece does not need precise control,
Short circuit phenomenon is avoided, processing stability is improve.
2. guided described in magnetic field control system, guided rings are connected with corner stepper motor and vertical stepper motor can be along cunning
Rail is slided up and down, and sustained height is kept with tool-electrode, so that magnetic field force is persistently exported, and guided rings can be with corner stepping electricity
Machine is rotated, pivot angle needed for there is tool-electrode, increased the flexibility of processing.
3. in the introduction by magnetic field electrolysis curved aperture apparatus of electric spark Compound Machining described in, computer can control corner stepper motor
Rotating speed and corner, the output voltage of digital stable power and vertically feeding motor feed speed, it is ensured that process curved
The machining accuracy in hole.
4. by electrolyte circulation system, the chip and depleted electrolytes of ablation can be constantly taken away, make the process can
To continue.
Brief description of the drawings
Fig. 1 is the schematic diagram that introduction by magnetic field is electrolysed the curved aperture apparatus of electric spark Compound Machining；
Fig. 2 is the schematic diagram of tool-electrode and guided rings relative position in device.
Reference is as follows：
1. computer, 2. control card, 3. vertical stepper motor, 4. corner stepper motor, 5. connecting rod, 6. flexible rubber hose,
7. adjustable pulsed power supply, 8. slide rail, 9. electrolyte, 10. tank, 11. auxiliary electrodes, 12. guided rings, 13. digital stable powers,
14. workpiece, 15. circulating pumps, 16. micropores, 17. left side calutrons, 18. magnetic fields, 19. right side calutrons, 20. instruments electricity
Pole, 21. universal joints.
Specific embodiment
Embodiment：Describe the details of use and working condition of the inventive method and device in detail with reference to Fig. 1 and Fig. 2.
Wherein electrolyte 9 is alkaline solution, and tool-electrode 20 uses steel tapered electrode, and workpiece 14 is non-magnet material,
Auxiliary electrode 11 uses graphite electrode；The conical top of tool-electrode 20 need to immerse electrolyte 9, and conical lower portion can be in universal joint 21
Freely rotate, adjustable pulsed power supply 7 0~60V of voltage, 1~5000Hz of frequency, dutycycle 0~100%.
Application method of the present invention is as follows：
Slide rail 8 is arranged on tank 10, the guided rings 12 that left side calutron 17 and right side calutron 19 are constituted
It is connected with corner stepper motor 4 on slide rail 8 and by connecting rod 5；Adjustable pulsed power supply 7 is in tool-electrode 20 and auxiliary electricity
On-load voltage between pole 11, constitutes electrolysis spark circuit and produces spark discharge and the material of ablation workpiece 14；Controlled by computer 1
The output voltage of digital stable power 13, left side calutron 17 and right side calutron 19 are by the on-load voltage of digital stable power 13
After send anisotropy field 18, corner stepper motor 4 drives guided rings 12 to go to special angle, magnetic field 18 under the control of computer 1
Also same angle is gone to therewith, and tool-electrode 20 is flapped toward this angle under magnetic field force effect, and flexible rubber hose 6 is in vertical stepping electricity
Machine 3 is fed under driving to the swaying direction of tool-electrode 20, and electrochemical discharge is processed in specific direction ablation material on workpiece 14
Go out curved hole.
Computer 1 is connected with control card 2 and digital stable power 13 respectively, according to the material of workpiece to be machined 14 not
Together, the different feed speed of vertical stepper motor 3 is controlled；Size Control corner stepper motor 4 according to curved hole to be processed
Corner；The output voltage of the size Control digital stable power 13 according to tool-electrode 20.
Circulating pump 15 is connected with the electrolyte 9 in tank 10 with flexible rubber hose 6, be delivered to for electrolyte 9 by circulating pump 15
In flexible rubber hose 6, electrolyte 9 flows to the machining area of tool-electrode 20 by micropore 16, and the effect of micropore 16 is in order to supplement work
Electrolyte at tool electrode 20, so that processing is persistently carried out.
Preferred embodiment but the present invention is not limited to above-mentioned implementation method to the embodiment for of the invention, not
In the case of substance of the invention, any conspicuously improved, replacement that those skilled in the art can make
Or modification belongs to protection scope of the present invention.
Claims (10)
1. a kind of introduction by magnetic field electrolysis curved aperture apparatus of electric spark Compound Machining, including electrolysis EDM System, guiding magnetic field
Control system and electrolyte circulation system；It is characterized in that：
The electrolysis EDM System includes feeding motor (3), tool-electrode (20), universal joint (21), adjustable arteries and veins vertically
Rush power supply (7), auxiliary electrode (11), control card (2) and computer (1)；The tool-electrode (20) is by universal joint (21)
It is connected with flexible rubber hose (6) lower end in electrolyte circulation system；The flexible rubber hose (6) opens up with universal joint (21) junction
There is micropore (16)；The tool-electrode (20) connects adjustable pulsed power supply (7) negative pole, and the auxiliary electrode (11) connects adjustable arteries and veins
Power supply (7) positive pole is rushed, in the tank (10) that the auxiliary electrode (11) is placed in guiding magnetic field control system；The vertical feeding
Motor (3) is connected with the control card (2), and the control card (2) is connected with the computer (1)；
Described guiding magnetic field control system includes guided rings (12), vertically corner stepper motor (4), feeding motor (3), connecting rod
(5), digital stable power (13), slide rail (8), tank (10)；The guided rings (12) are on slide rail (8) madial wall and can
Slided along slide rail (8), guided rings (12) are connected by connecting rod (5) with the corner stepper motor (4), and guided rings (12) can lead to
Connecting rod (5) is crossed to be rotated with corner stepper motor (4)；The slide rail (8) is installed in tank (10) bottom, the corner stepper motor
(4) it is connected with computer (1) on vertical feeding motor (3) and by the control card (2)；
The electrolyte circulation system includes flexible rubber hose (6), circulating pump (15), electrolyte (9)；The circulating pump (15) is by electricity
Solution liquid (9) is delivered in the flexible rubber hose (6), and the flexible rubber hose (6) is placed in the surface of guided rings (12)；The flexibility
Electrolyte (9) in sebific duct (6) flows to machining area through the micropore (16).
2. introduction by magnetic field according to claim 1 is electrolysed the curved aperture apparatus of electric spark Compound Machining, it is characterised in that described soft
Property sebific duct (6) below be provided with workpiece (14), workpiece (14) is placed in tank (10).
3. introduction by magnetic field according to claim 2 is electrolysed the curved aperture apparatus of electric spark Compound Machining, it is characterised in that：The work
Part (14) is non-magnet material, and the tool-electrode (20) is steel tapered electrode, and the auxiliary electrode (11) is graphite electrode,
The electrolyte (9) is alkaline solution, and the tool-electrode (20) need to immerse electrolyte (9), and the flexible rubber hose (6) is a diameter of
1~5mm and elastic deformation can occur, adjustable pulsed power supply (7) 0~60V of voltage, 1~5000Hz of frequency, dutycycle 0
~100%.
4. introduction by magnetic field according to claim 3 is electrolysed the curved aperture apparatus of electric spark Compound Machining, it is characterised in that：Described ten thousand
To section (21) envelope tool-electrode (20) taper bottom surface, the tool-electrode (20) can freely put in the universal joint (21)
It is dynamic.
5. introduction by magnetic field according to claim 1 is electrolysed the curved aperture apparatus of electric spark Compound Machining, it is characterised in that：It is described to draw
Lead ring (12) includes left side calutron (17) and right side calutron (19)；The left side calutron (17) and right side electromagnetism
Device (19) radial symmetric and by the digital stable power (13) on-load voltage produce anisotropy field, the digital stable power
(13) output voltage is controlled by computer (1).
6. introduction by magnetic field according to claim 1 is electrolysed the curved aperture apparatus of electric spark Compound Machining, it is characterised in that：The meter
Calculation machine (1) controls rotating speed and corner and the vertical feeding of the corner stepper motor (4) by the control card (2)
The feed speed of motor (3).
7. introduction by magnetic field according to claim 3 is electrolysed the curved aperture apparatus of electric spark Compound Machining, it is characterised in that：The work
Tool electrode (20) is by magnetization treatment, conical lower portion and top magnetic conversely, taper is 1:2~1:8.
8. the method that the curved aperture apparatus of electric spark Compound Machining are electrolysed based on introduction by magnetic field according to claim 1 to 7, it is special
Levy and be, comprise the following steps：
Step S1：Adjustable pulsed power supply (7) is connected and on-load voltage with tool-electrode (20) and auxiliary electrode (11) respectively, will
Digital stable power (13) is connected with guided rings (12), and digital stable power (13) output voltage is controlled by computer (1)；
Step S2：There is electrochemical discharge ablation material in tool-electrode (20), the left side calutron (17) in guided rings (12)
With right side calutron (19) by producing anisotropy field after the digital stable power (13) on-load voltage, guided rings (13) are with turning
Angle stepper motor (4) is rotated, and tool-electrode (20) by directional magnetic field power because being produced pivot angle；
Step S3：Feeding motor (3) drives flexible rubber hose (6) to be pointed to tool-electrode (20) vertically under computer (1) control
Feeding, tool-electrode (20) is towards swaying direction ablation material；
Step S4：Database is set up, according to the different vertical feed speeds of the different settings of the workpiece (14) material, according to instrument
The size of electrode (20) sets the different output voltage of digital stable power (13)；
Step S5：In electrochemical discharge process, be delivered to for the electrolyte (9) in tank (10) by the circulating pump (15)
In flexible rubber hose (6), electrolyte (9) flow to machining area through micropore (16).
9. introduction by magnetic field according to claim 8 is electrolysed the curved hole method of electric spark Compound Machining, it is characterised in that：The step
Suddenly in (2), the guided rings (12) can up and down, circumferentially be slided in slide rail (8), and sustained height is kept with tool-electrode (20).
10. introduction by magnetic field according to claim 9 is electrolysed the curved hole method of electric spark Compound Machining, it is characterised in that：It is described
In step (3), the flexible rubber hose (6) is resiliently flexible so as to be fed to the curved hole direction of workpiece (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710197211.2A CN106825806B (en) | 2017-03-29 | 2017-03-29 | A kind of device and method in the introduction by magnetic field electrolysis curved hole of electric spark Compound Machining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710197211.2A CN106825806B (en) | 2017-03-29 | 2017-03-29 | A kind of device and method in the introduction by magnetic field electrolysis curved hole of electric spark Compound Machining |
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| CN106825806A true CN106825806A (en) | 2017-06-13 |
| CN106825806B CN106825806B (en) | 2019-04-30 |
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| CN201710197211.2A Expired - Fee Related CN106825806B (en) | 2017-03-29 | 2017-03-29 | A kind of device and method in the introduction by magnetic field electrolysis curved hole of electric spark Compound Machining |
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Cited By (4)
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| CN108655519A (en) * | 2018-05-21 | 2018-10-16 | 上海交通大学 | Arc discharge processes fliud flushing regional control system |
| CN110026628A (en) * | 2019-04-12 | 2019-07-19 | 广东工业大学 | A kind of electrochemical machining apparatus and its method for electrochemical machining based on mangneto deformation poll |
| CN110842307A (en) * | 2019-11-22 | 2020-02-28 | 合肥工业大学 | Electrochemical machining tool for complex inner wall structure with poor accessibility |
| CN113770461A (en) * | 2021-09-24 | 2021-12-10 | 长沙理工大学 | Method and system for electrochemical discharge machining of micro-hole by using magnetofluid driving solution |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108655519A (en) * | 2018-05-21 | 2018-10-16 | 上海交通大学 | Arc discharge processes fliud flushing regional control system |
| CN110026628A (en) * | 2019-04-12 | 2019-07-19 | 广东工业大学 | A kind of electrochemical machining apparatus and its method for electrochemical machining based on mangneto deformation poll |
| CN110842307A (en) * | 2019-11-22 | 2020-02-28 | 合肥工业大学 | Electrochemical machining tool for complex inner wall structure with poor accessibility |
| CN113770461A (en) * | 2021-09-24 | 2021-12-10 | 长沙理工大学 | Method and system for electrochemical discharge machining of micro-hole by using magnetofluid driving solution |
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| Publication number | Publication date |
|---|---|
| CN106825806B (en) | 2019-04-30 |
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