CN109732157A - A kind of near-dry type high-speed electric spark processing method and its device - Google Patents
A kind of near-dry type high-speed electric spark processing method and its device Download PDFInfo
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- CN109732157A CN109732157A CN201910139858.9A CN201910139858A CN109732157A CN 109732157 A CN109732157 A CN 109732157A CN 201910139858 A CN201910139858 A CN 201910139858A CN 109732157 A CN109732157 A CN 109732157A
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- 238000010892 electric spark Methods 0.000 title claims abstract description 25
- 238000003672 processing method Methods 0.000 title claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 52
- 238000005507 spraying Methods 0.000 claims abstract description 49
- 230000005495 cold plasma Effects 0.000 claims abstract description 48
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 47
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The present invention provides a kind of near-dry type high-speed electric spark processing method and its devices, belong to machining and field of tool.The method is using the blending agent that atmosphere cold plasma jet stream is formed with coaxial spraying jet as electrical discharge machining medium, the introducing of coaxial spraying jet can greatly improve the cooling velocity of melting galvanic corrosion product, to improve electro-discharge machining stability and processing efficiency.Before processing, workpiece, tool-electrode are connected with the corresponding polarity of the pulse power, adjust the position of blending agent generating assembly, make the end of tool-electrode, the region to be processed of workpiece, be completely submerged in blending agent.The invention proposes a kind of atmosphere cold plasma jet stream high speed electric discharge machining methods, it can be obtained with cheap cost much higher than the material removing rate in pure atmosphere cold plasma jet stream, in atmosphere cold plasma jet stream and coaxial high speed air jet blending agent under identical machining energy.
Description
Technical field
The present invention relates to a kind of near-dry type high-speed electric spark processing method and its devices, belong to machining and tool technique
Field.
Background technique
Electrical discharge machining medium directly affects the finger such as efficiency, precision, surface quality and environmental protection of this kind of processing technology
Mark.Industrial common electrical discharge machining medium mainly includes oil base working solution and Water-based working liquid for electrical.Oil base working solution processing essence
Degree is high, but there are fire hazard, can release pernicious gas in process, it is steady that the carbon being precipitated in process will affect processing
Qualitative and efficiency；Fire hazard is not present in Water-based working liquid for electrical, but there are electrolytic etchings in processing, and can seriously affect processing essence
Degree, and lathe may be corroded.Positive allusion quotation of state's branch etc. proposed dry EDM in 1997, i.e., using compressed gas as adding
Work medium the advantage is that electrode wear rate is low.But processing in short circuit ratio it is very high (KUNIEDA M, YOSHIDA M,
TANIGUCHI N 1997.Electrical Discharge Machining in Gas.CIRP Annals-
Manufacturing Technology[J],46:143-146.).Also, the used tool electrode of dry EDM is more
For hollow edged electrode.But when processing fine structure or feature, the diameter of tool-electrode is usually at 100 μm hereinafter, generally require
Line production, it is extremely difficult lower than 100 μm of hollow edged electrode to produce outer diameter online, even if can prepare online, due to micro hole
Throttle effect, it is also difficult to the air-flow that processing is used enough is passed through into processing gap lower than 100 μm of micropore by diameter, this
So that it is relatively difficult to achieve to carry out electric spark fine structure processing in gas in the way of interior jet.Thereafter, though there is scholar using external
The mode of ventilation carries out electric spark capillary processing in gas and studies, but less effective, and short circuit ratio is high in processing, and export license is serious
(more than 30%) (LI L Q, ZHU G Z 2011.Investigate on Micro-EDM in Air (dry MEDM) by
External Blowing Mode Based on RC Pulse Generator[J]Advanced Materials
Research 317-319:334-340.).Atmosphere cold plasma jet stream is sprayed between electrode and workpiece and is situated between as processing
Matter, can obtain from liquid, the processing effect that dry EDM is different.The invention of Patent No. 201610874299.2
Patent describes a kind of electric discharge machining method based on cold-plasma jet, and when being processed using this method, interpolar state adds
Work efficiency rate and working gas flow are closely bound up, to obtain preferable interpolar state and higher processing efficiency is needed using larger
The high-purity gas of flow is to remove the galvanic corrosion product generated in processing, if but relying solely on to generate cold-plasma jet
High-purity gas, then cost is very high.Patent 201710023496.8 proposes the mode of addition coaxial high speed air jet to improve
Electrical discharge machining efficiency in atmosphere cold plasma jet stream, but raising is limited, is less than 2 times.Therefore, it is necessary to take it
His ancillary measure further increases the processing efficiency in atmosphere pressure plasma jet flow, and the correlative study about this respect, until
The present has not been reported.
Summary of the invention
The present invention is directed to propose a kind of near-dry type high-speed electric spark processing method and its device, this method equipment is simple, at
Sheet is cheap, does not damage to environment, is a kind of sustainable manufacturing method.A kind of near-dry type high-speed electric spark processing method is same in utilization
The blending agent for the atmosphere cold plasma jet stream composition that axis spraying jet and patent 201610874299.2 propose is as electricity
Spark machining medium, and ultrasonic vibration is applied to workpiece simultaneously.Melting galvanic corrosion product can be improved in the introducing of coaxial spraying jet
Cooling velocity, and the efficiency of dishing out of galvanic corrosion product then can be improved in the addition of ultrasonic vibration, is much higher than patent to obtain
201610874299.2 with 201710023496.8 proposed in processing method electro-discharge machining stability and processing efficiency.
Technical solution of the present invention:
A kind of near-dry type high-speed electric spark processing unit (plant), device therefor are the electrical fires proposed in patent 201710023496.8
On the basis of flower machining tool and atmosphere cold plasma jet flow generating apparatus, coaxial spraying jet generating device and ultrasound are added
Vibration device.
Described in patent 201710023496.8 go out electric spark machine tool include lathe base 1, control computer 2,
Data collecting card 3, machining state detection device 4, XYZ three-shaft linkage motion platform 5, the pulse power 6, live spindle 7, tool electricity
Pole 8, workpiece 10, work holder 11 and Universal fixed support 21；
Atmosphere cold plasma jet flow generating apparatus described in patent 201710023496.8 includes end cap 9-3, nozzle
Middle cylinder 9-4, pin electrode 9-5, electric discharge nozzle 9-7, gas quality flow rate controller 12, pressure regulator valve 13, high-purity 14 and of work gas source
Plasma generating power supply 16；
It includes that coaxial spray nozzle 9-1, transition cylinder 9-2, waterproof are exhausted that the present invention, which increases coaxial spraying jet generating device newly,
Edge nozzle 9-6 and spraying jet generating assembly 15；Spraying jet generating assembly 15 include fan 15-1, droplet collecting hood 15-2,
Work water source 15-4, ultrasonic atomizatio piece 15-5, blower tray 15-6 and water storage box 15-7；
The ultrasonic vibration installation that the present invention increases newly includes supersonic generator 17 and ultrasonic transducer 18.
High-purity work gas source 14 successively enters blending agent by pressure regulator valve 13 and gas quality flow rate controller 12
Component 9 recycles plasma generating power supply 16 to apply the i.e. producible cold plasma of voltage to blending agent generating assembly 9 and penetrates
Stream 20；The spraying medium that spraying jet generating assembly 15 generates is applied in blending agent generating assembly 9 penetrates with cold plasma
Stream 20 produces the blending agent 19 of cold-plasma jet and coaxial spraying jet；It will be mixed by Universal fixed support 21
Medium generating assembly 9 is fixed on lathe base 1, and utilizes its adjusting position；At the same time, supersonic generator 17 is kept to beat
It opens, ultrasonic vibration can be applied on workpiece 10.
Coaxial spray nozzle 9-1, transition cylinder 9-2, waterproof insulation nozzle 9-6 are hollow slewing parts.Transition post
It is equipped with internal screw thread before and after body 9-2, is connect by the internal screw thread of rear end with the external screw thread on end cap 9-3；The internal screw thread of front is then
For installing fixed waterproof insulation nozzle 9-6.The outside of waterproof insulation nozzle 9-6 is equipped with external screw thread since head, and same
Internal screw thread connection on axis spray nozzle 9-1.Droplet enters region of discharge and brings security risk, waterproof insulation nozzle in order to prevent
The connecting portion of 9-6 and transition cylinder 9-2 necessarily be in waterproof insulation nozzle 9-6 and coaxial spray nozzle 9-1 connecting portion it
Outside.For the lasting high-insulativity of guarantee, waterproof insulation nozzle 9-6 should use the material that dielectric strength is high and water absorption rate is low, such as:
PEEK, polytetrafluoroethylene (PTFE) etc..Coaxial spray nozzle 9-1 and transition cylinder 9-2 to material without particular/special requirement, use is at low cost, from
The good material of heavy and light, machinability, the generally common non-metallic material such as selection polytetrafluoroethylene (PTFE), PP, ABS, PMMA, nylon
Material.
Ultrasonic atomizatio piece 15-5 is directly flat on the bottom of water storage box 15-7, fan 15-1 by blower tray 15-6 with
Water storage box 15-7 is connected, and droplet collecting hood 15-2 is placed in above water storage box 15-7.
In order to reduce the generation of cell reaction, the work water source 15-4 of coaxial high speed jet stream preferably chooses deionized water, steams
The high-purity waters such as distilled water.
18 tail portion of ultrasonic transducer is equipped with through-hole, is bolted to work holder 11, leading portion then passes through
Special fixture fixes workpiece 10.Supersonic generator 17 is flat on workbench or ground, passes through accessory cables and ultrasound
Wave transducer 18 connects.
A kind of near-dry type high-speed electric spark processing method, the atmosphere cold etc. proposed using patent 201610874299.2 from
Daughter jet stream and the mixture of coaxial spraying jet composition proposed by the present invention are applied as electrical discharge machining medium, while to workpiece
Add ultrasonic vibration；When work, tool-electrode connects to the cathode of the pulse power, workpiece connects the anode of the pulse power, by it is cold it is equal from
The blending agent of daughter jet stream and coaxial spraying jet composition is applied between tool-electrode and workpiece, and adjustment nozzle location ensures
Region to be processed is submerged in blending agent completely, and work in-process will not be interfered with lathe.By controlling computer
Movement instruction is passed into machine tool motion platform, and feed speed etc. is adjusted according to processing feedback signal in time.After processing is completed
Close cold-plasma jet and coaxial spraying jet blending agent generating device and electric spark machine tool.
Beneficial effects of the present invention: blending agent used by atmosphere cold plasma jet stream and coaxial is sprayed in the present invention
Jet stream composition.The introducing of coaxial spraying jet can greatly improve the cooling velocity of melting galvanic corrosion product, and it is heavy to be effectively prevented its
Finished surface or tool-electrode end newly are adhered to, the addition of ultrasonic vibration at the same time can be by the galvanic corrosion after cooled and solidified
Product is dished out from interpolar rapidly, to improve electro-discharge machining stability and processing efficiency.It obtains at the work water source of coaxial high speed jet stream
Take conveniently, it is cheap, in actual processing, dosage is also considerably less, therefore cost is very low；Misty medium in coaxial spraying jet
It is generated by ultrasonic atomizatio piece, the vibration frequency of ultrasonic atomizatio piece is in MHz rank, and the misty liquid droplets diameter that this kind of mode generates is only
Have a few micrometers, is very suitable to electrical discharge machining.Due to the presence of high speed plasma jet stream and ultrasonic vibration, it is cold to be atomized jet stream
But, the galvanic corrosion product for being frozen into metallic particles can be discharged rapidly out of discharging gap, therefore the blending agent can obtain ratio
Higher galvanic corrosion product is dished out efficiency, more stable process in patent 201610874299.2 and 201710023496.8,
To obtain higher material removing rate speed.
Therefore, the present invention can be penetrated with cheap cost acquisition than pure atmosphere cold plasma under identical machining energy
In stream in (patent 201610874299.2), atmosphere cold plasma jet stream and coaxial high speed air jet blending agent (specially
Benefit 201710023496.8 and 201720026465.3) higher material removing rate.And remain patent
Medium preparation is easy, does not damage to environment, will not treat machining area in 201610874299.2 and 201710023496.8
Metal material surface causes the advantages of thermal damage.
Detailed description of the invention
Fig. 1 is device therefor structure composition and connection schematic diagram in the embodiment of the present invention.
Fig. 2 is the installation diagram and connection signal of blending agent generating assembly and spraying jet generating assembly used in embodiment
Figure.
Fig. 3 be in embodiment respectively in cold-plasma jet (patent 201610874299.2), atmosphere cold etc. from
(patent 201710023496.8) in daughter jet stream and coaxial high speed air jet blending agent, it is applied with ultrasonic vibration auxiliary
Cold-plasma jet and the material removing rate MRR of electrical discharge machining in coaxial spraying jet blending agent (present invention) are compared
Figure.
In figure: 1 lathe base；2 control computers；3 data collecting cards；4 machining state detection devices；5XYZ three-shaft linkage
Motion platform；6 pulse powers；7 live spindles；8 tool-electrodes；9 blending agent generating assemblies；The coaxial spray nozzle of 9-1；9-2
Transition cylinder；9-3 end cap；Cylinder in 9-4 nozzle；9-5 pin electrode；9-6 waterproof insulation nozzle；9-7 electric discharge nozzle；10 workpiece；11
Work holder；12 gas quality flow rate controllers；13 pressure regulator valves；14 high-purity work gas sources；15 spraying jet generating assemblies；
15-1 fan；15-2 droplet collecting hood；15-3 droplet；15-4 work water source；15-5 ultrasonic atomizatio piece；15-6 blower tray；15-
7 water storage boxes；16 plasma generating power supplies；17 supersonic generators；18 ultrasonic transducers；19 blending agents；20 it is cold it is equal from
Daughter jet stream；Universal fixed support 21.
Specific embodiment
Below in conjunction with attached drawing and technical solution, a specific embodiment of the invention is further illustrated.
The present invention relates to a kind of near-dry type high-speed electric spark processing method, device therefor includes patent 201710023496.8
The electric spark machine tool of proposition adds coaxial spraying jet with atmosphere cold plasma jet flow generating apparatus and the present invention
Generating device and ultrasonic vibration installation.
Electric spark machine tool described in patent 201710023496.8 includes: lathe base 1, control computer 2, data
Capture card 3, machining state detection device 4, XYZ three-shaft linkage motion platform 5, the pulse power 6, live spindle 7, tool-electrode 8,
Workpiece 10, work holder 11；
Atmosphere cold plasma jet flow generating apparatus described in patent 201710023496.8 includes: end cap 9-3, nozzle
Middle cylinder 9-4, pin electrode 9-5, electric discharge nozzle 9-7, gas quality flow rate controller 12, pressure regulator valve 13, high-purity 14 and of work gas source
Plasma generating power supply 16；
It includes that coaxial spray nozzle 9-1, transition cylinder 9-2, waterproof are exhausted that the present invention, which increases coaxial spraying jet generating device newly,
Edge nozzle 9-6 and spraying jet generating assembly 15；Spraying jet generating assembly 15 include fan 15-1, droplet collecting hood 15-2,
Work water source 15-4, ultrasonic atomizatio piece 15-5, blower tray 15-6 and water storage box 15-7；The ultrasonic vibration installation that the present invention increases newly
Including supersonic generator 17 and ultrasonic transducer 18.
Before carrying out electrical discharge machining, coaxial spraying jet generating device is increased newly first, in accordance with 2 couples of present invention of attached drawing and is carried out
Assembly: the mode of threaded connection is passed sequentially through on coaxial spray nozzle 9-1, waterproof insulation nozzle 9-6, between transition cylinder 9-2
Installation is fixed, and the internal screw thread of the tail portion transition cylinder 9-2 and the end cap 9-3 of atmosphere cold plasma jet flow generating apparatus are recycled
It is connected；Ultrasonic atomizatio piece 15-5 is directly flat on the bottom of water storage box 15-7, and fan 15-1 is by blower tray 15-6 and storing
Water tank 15-7 is connected, and work water source 15-4 is injected into water storage box 15-7, and the liquid level of work water source 15-4 is more than ultrasonic atomization
Piece 15-5 20~50mm of upper surface is advisable, and droplet collecting hood 15-2 is placed in above water storage box 15-7.
Secondly, these equipment are separately connected according to attached drawing 1: workpiece 10 and tool-electrode 8 respectively with the pulse power 6 just
Cathode is connected；The high-voltage output end of plasma generating power supply 16 is connected with pin electrode 9-5, and low-voltage output is then sprayed with electric discharge
Mouth 9-7 is connected；The supply circuit of plasma working gas are as follows: high-purity work gas source 14 → pressure regulator valve, 13 → gas mass flow
12 → blending agent of controller generating assembly 9；The supply circuit of coaxial spraying jet are as follows: spraying jet generating assembly 15 → mixing
Medium generating assembly 9.Tool-electrode 8 and workpiece 10 are mounted on live spindle 7 and ultrasonic wave by respective special fixture respectively
On energy converter 18, ultrasonic transducer 18 is then installed by bolt to work holder 11, and then is fixed on the worktable.
After connection is completed, supersonic generator 17 is opened, makes the workpiece 10 being installed on ultrasonic transducer 18 with super
Acoustic frequency vibration.The valve of high-purity work gas source 14 is opened, high-purity work that pressure regulator valve 13 exports high-purity work gas source 14 is adjusted
Make gas and gas quality flow rate controller 12 is entered with suitable pressure, regulating gas Mass flow controllers 12 to setting value,
The region of discharge that high-purity working gas will enter pin electrode 9-5 at this time with the flow of setting and the nozzle 9-7 that discharges is formed.This
When, plasma generating power supply 16 is opened, adjusts its voltage and frequency to desired value, it will be in the exit of electric discharge nozzle 9-7
Generate stable cold-plasma jet 20.The switch for opening ultrasonic atomizatio piece 15-5 can use ultrasonic vibration for its top
Work water source 15-4 be atomized into the droplet that diameter only has a few micrometers, thus in droplet collecting hood 15-2 formed droplet 15-
The droplet 15-3 formed in droplet collecting hood 15-2 can be blown into coaxial spray nozzle 9-1 by 3, fan 15-1, be formed spraying
Jet stream after mixing with cold-plasma jet 20, can form cold plasma in the exit of blending agent generating assembly 9
The blending agent 19 of jet stream and coaxial spraying jet, the driving current for adjusting ultrasonic atomizatio piece 15-5 can control spraying jet
Flow.
Adjust the position of blending agent generating assembly 9, it is ensured that machining area and not can be completely covered in blending agent 19
Other positions interfere with lathe in process for meeting.The pulse power 6 is opened, required machined parameters are adjusted to, is opened
Movement instruction is passed to XYZ three-shaft linkage motion platform 5 and live spindle 7 by control computer 2, and the movement of XYZ three-shaft linkage is flat
Platform 5 and live spindle 7 complete corresponding movement, to process specific structure and spy on workpiece 10 according to movement instruction
Sign, the discharge signal that simultaneous processing condition checkout gear 4 can will test pass to control computer 2, control through data collecting card 3
Computer 2 processed then adjusts movement instruction according to discharge signal immediately, to maintain suitable processing gap, to guarantee electro-discharge machining
Stablize and carries out.After processing is completed, plasma generating power supply 16, high-purity work gas source 14, gas mass flow control are successively closed
Instrument 12, ultrasonic atomizatio piece 15-5, fan 15-1 and control computer 2 processed.
Embodiment
The example that the fine slot experiment of electric spark milling will be combined illustrates the present invention significantly mentioning to electric spark erosion speed
It rises.Experimental facilities is connected according to shown in Fig. 1 first.The material of tool-electrode 8 is tungsten in the present embodiment, and the material of workpiece 10 is
H62 brass, high-purity work gas source 14 use purity for 99.999% high pure nitrogen, and work water source 15-4 is deionized water, super
The frequency that sonic generator 17 generates exists.Electrical discharge machining medium is respectively cold-plasma jet (patent
201610874299.2), cold-plasma jet and coaxial high speed air jet blending agent (patent 201710023496.8),
Cold-plasma jet (when processing in this medium, while applying ultrasound vibration with coaxial spraying jet blending agent on workpiece
It is dynamic).Pulse power type is selected as the RC pulse power, and machining energy is respectively set to voltage 100V capacitor 8200pF, voltage 80V
Capacitor 3300pF and voltage 80V capacitor 470pF.It opens supersonic generator 17 (signal of output frequency about 35kHz), makes to install
In the workpiece 10 on ultrasonic transducer 18 with ultrasonic frequency vibratory；Adjust the outlet pressure and gas mass flow of pressure regulator valve 13
The output flow of controller 12, so that the gas flow into blending agent generating assembly 9 is the 1500mL/min (status of criterion
Under).
Plasma generating power supply 16 is opened, its output voltage is gradually increased, adjusts discharge frequency, until blending agent is sent out
The outlet of raw component 9 generates stable cold-plasma jet 20；Ultrasonic atomizatio piece 15-5 is opened, its driving current is adjusted, makes
The flow of spraying jet is 5mL/min, generates cold-plasma jet and coaxial spraying jet blending agent 19.Adjustment mixing is situated between
The position of matter generating assembly 9 and angle are submerged in region to be processed completely in blending agent 19, and ensure that blending agent is sent out
It is raw that component 9 will not other positions interfere with lathe in process.It at this time can be defeated by good NC code prepared in advance
Enter to control computer 2, executes spark discharge processing order.
Fig. 2 is the electric discharge of open-circuit voltage 100V capacitor 8200pF, voltage 80V capacitor 3300pF and voltage 80V capacitor 470pF
Under parameter, in different media, material removing rate MRR comparison.From figure it can be found that when machining energy is open-circuit voltage
When 100V capacitor 8200pF and voltage 80V capacitor 3300pF, the cold-plasma jet for being applied with ultrasonic vibration is sprayed with coaxial
Material removing rate MRR in jet mixing medium (present invention) is much higher than the cold-plasma jet (patent under the same terms
201610874299.2), cold-plasma jet and coaxial high speed air jet blending agent (patent 201710023496.8),
Even if material is gone with cold-plasma jet compared with coaxial high speed air jet blending agent (patent 201710023496.8)
Except the promotion of rate MRR is more than 4 times.When machining energy is voltage 80V capacitor 470pF, since energy is too small, in cold plasma
Body jet stream (patent 201610874299.2), cold-plasma jet and coaxial high speed air jet blending agent (patent
201710023496.8) in can not normal process, but the cold-plasma jet for being applied with ultrasonic vibration with it is coaxial spraying
But very high material removing rate MRR is obtained in jet mixing medium (present invention), or even much higher than open-circuit voltage 100V electricity
Hold 8200pF and cold-plasma jet (patent 201610874299.2) under voltage 80V capacitor 3300pF energy, cold etc. from
Material removing rate MRR in daughter jet stream and coaxial high speed air jet blending agent (patent 201710023496.8).
Therefore atmosphere cold plasma jet stream and the blending agent of coaxial spraying jet is used to be situated between as electrical discharge machining
Matter applies ultrasonic vibration to workpiece at the same time, can obtain than cold-plasma jet (patent 201610874299.2), cold
Higher material removing rate in plasma jet and coaxial high speed air jet blending agent (patent 201710023496.8)
MRR。
The Applicant declares that the above embodiment of the present invention is used for the purpose of clearly illustrating examples made by the present invention, and simultaneously
The non-restriction to embodiments of the present invention.For those of ordinary skill in the art, on the basis of the above description
Other various forms of variations or variation can also be made, there is no necessity and possibility to exhaust all the enbodiments.It is all
Any modification, equivalent spy made by within the spirit and principles in the present invention are changed and are improved, and should be included in right of the present invention
Within the scope of it is required that.
Claims (7)
1. a kind of near-dry type high-speed electric spark processing unit (plant), it is characterised in that: in the electrical fire that patent 201710023496.8 proposes
On the basis of flower machining tool and atmosphere cold plasma jet flow generating apparatus, coaxial spraying jet generating device and ultrasound are added
Vibration device；
The coaxial spraying jet generating device added includes coaxial spray nozzle (9-1), transition cylinder (9-2), waterproof insulation spray
Mouth (9-6) and spraying jet generating assembly (15)；Spraying jet generating assembly (15) includes fan (15-1), droplet collecting hood
(15-2), work water source (15-4), ultrasonic atomizatio piece (15-5), blower tray (15-6) and water storage box (15-7)；Waterproof insulation
It is threadedly coupled between nozzle (9-6) and transition cylinder (9-2), coaxial spray nozzle (9-1) is set in waterproof insulation nozzle (9-6)
Outside is threadedly coupled between waterproof insulation nozzle (9-6), recycles the internal screw thread and atmospheric pressure of the tail portion transition cylinder (9-2)
The end cap (9-3) of cold-plasma jet generating device is connected；Ultrasonic atomizatio piece (15-5) is directly flat on water storage box (15-7)
Bottom, fan (15-1) inject work into water storage box (15-7) by being connected to blower tray (15-6) with water storage box (15-7)
Make water source (15-4), droplet collecting hood (15-2) is placed in above water storage box (15-7)；
The ultrasonic vibration installation added includes supersonic generator (17) and ultrasonic transducer (18)；Ultrasonic transducer (18)
Tail portion is equipped with through-hole, is bolted on work holder (11), and leading portion is then fixed by fixture fixed workpiece (10)；
Supersonic generator (17) is flat on workbench or ground, is connect by accessory cables with ultrasonic transducer (18).
2. near-dry type high-speed electric spark processing unit (plant) according to claim 1, it is characterised in that: the waterproof insulation spray
Mouth (9-6) is using the PEEK or polytetrafluoroethylene (PTFE) that dielectric strength is high and water absorption rate is low；The coaxial spray nozzle (9-1) and mistake
It crosses cylinder (9-2) and selects polytetrafluoroethylene (PTFE), PP, ABS, PMMA or nylon.
3. a kind of near-dry type high-speed electric spark processing method, which is characterized in that proposed using patent 201610874299.2 big
The mixture that air pressure cold-plasma jet is formed with coaxial spraying jet proposed by the present invention is as electrical discharge machining medium, together
When to workpiece apply ultrasonic vibration；When work, tool-electrode is connect to the cathode of the pulse power, workpiece is connecting the pulse power just
The blending agent that cold-plasma jet and coaxial spraying jet form is applied between tool-electrode and workpiece, adjusts by pole
Nozzle location ensures that region to be processed is submerged in blending agent completely, and work in-process will not be interfered with lathe；It is logical
It crosses control computer and movement instruction is passed into machine tool motion platform, and feed speed is adjusted according to processing feedback signal in time；
Cold-plasma jet and coaxial spraying jet blending agent generating device and electric spark machine tool are closed after processing is completed；
High-purity work gas source (14) is successively sent out by pressure regulator valve (13) and gas quality flow rate controller (12) into blending agent
Raw component (9) recycle plasma generating power supply (16) to produce blending agent generating assembly (9) application voltage cold etc.
Gas ions jet stream (20)；The spraying medium that spraying jet generating assembly (15) generates is applied in blending agent generating assembly (9)
The blending agent (19) of cold-plasma jet with coaxial spraying jet is generated with cold-plasma jet (20)；It is same with this
When, it keeps supersonic generator (17) to open, i.e., ultrasonic vibration is applied on workpiece (10)；
The position for adjusting blending agent generating assembly (9), is submerged in work area to be added completely in blending agent (19)；Open control
Movement instruction is transferred to XYZ three-shaft linkage motion platform by control computer (2) by computer (2) and the pulse power (6)
(5) and live spindle (7) it, controls it and completes corresponding movement, the structure and feature of setting are processed on workpiece (10), simultaneously
The discharge signal that machining state detection device (4) will test passes to control computer (2), control through data collecting card (3)
Computer (2) then adjusts movement instruction according to discharge signal immediately, to maintain suitable processing gap, to guarantee electro-discharge machining
Stablize and carries out；After processing is completed, plasma generating power supply (16), high-purity work gas source (14), gas mass flow are successively closed
Measure controller (12), spraying jet generating assembly (15) and control computer (2).
4. a kind of near-dry type high-speed electric spark processing method according to claim 3, it is characterised in that: coaxial spraying jet
Producing method is that ultrasonic atomizatio piece (15-5) generates the ultrasonic vibration that work water source (15-4) applies.
5. a kind of near-dry type high-speed electric spark processing method according to claim 3 or 4, it is characterised in that: coaxial spraying
Jet stream generates required ultrasonic atomizatio piece (15-5), and vibration frequency is in MHz rank；The signal frequency that supersonic generator 17 generates
Rate is in kHz rank.
6. a kind of near-dry type high-speed electric spark processing method according to claim 3 or 4, it is characterised in that: coaxial spraying
Work water source (15-4) needed for jet stream generates is the high-purity waters such as deionized water or distilled water.
7. a kind of near-dry type high-speed electric spark processing method according to claim 5, it is characterised in that: coaxial spraying jet
Work water source (15-4) needed for generating is the high-purity waters such as deionized water or distilled water.
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| CN110202225A (en) * | 2019-06-17 | 2019-09-06 | 南京航空航天大学 | Air-flow auxiliary improves the method and device of the compound perforation processing quality of electric spark and electrolysis |
| CN111390307A (en) * | 2020-04-23 | 2020-07-10 | 昆山正多荣五金机械有限公司 | Electric spark machining equipment with ultrasonic assistance |
| CN111885808A (en) * | 2020-07-22 | 2020-11-03 | 安徽工业大学 | Atmospheric pressure cold plasma jet flow auxiliary focusing device |
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| CN106513881A (en) * | 2017-01-13 | 2017-03-22 | 大连理工大学 | Method and device capable of improving machining efficiency of electric sparks in atmospheric pressure cold plasma jet |
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