CN206445323U - A kind of device for improving electrical discharge machining efficiency in atmosphere cold plasma jet - Google Patents
A kind of device for improving electrical discharge machining efficiency in atmosphere cold plasma jet Download PDFInfo
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- CN206445323U CN206445323U CN201720026465.3U CN201720026465U CN206445323U CN 206445323 U CN206445323 U CN 206445323U CN 201720026465 U CN201720026465 U CN 201720026465U CN 206445323 U CN206445323 U CN 206445323U
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Abstract
The utility model is related to a kind of device for improving electrical discharge machining efficiency in atmosphere cold plasma jet, belongs to machining and field of tool.The blending agent of cold gas ions jet and coaxial high speed jet to be generated based on cold-plasma jet and coaxial high speed jet complex generator is used as electrical discharge machining medium.Before processing, workpiece, tool-electrode are connected with the corresponding polarity of impulse generator, the position of adjustment cold plasma fluid generator and coaxial high speed air current spray nozzle makes electrode tip, workpiece region to be processed, is completely submerged in blending agent.The utility model proposes a kind of device for improving electrical discharge machining efficiency in atmosphere cold plasma jet, can be under same processing conditions, the material removing rate higher than in pure cold-plasma jet is obtained, than more preferable crudy in nitrogen jet current and the blending agent of high-velocity jets.
Description
Technical field
The utility model is related to a kind of device for improving electrical discharge machining efficiency in atmosphere cold plasma jet, belongs to
Machining and field of tool.
Background technology
Machining medium is to having important influence in terms of the efficiency of electrical discharge machining, quality, cost and environment.Electric fire
Processing oil and deionization are spent from the common fault that the liquid mediums such as water are electrical discharge machinings in the conventional machining medium of current electric spark, liquid
It is that export license is larger.In addition, with spark processing oil as working solution, there is the gas decomposed in disaster hidden-trouble, processing
There is pollution to environment, after machining, also need to clean workpiece using acetone and other organic solvent.If being made with deionized water
For working solution, larger discharging gap and higher process velocity can be obtained, but water is used as spuious corruption in being processed during working solution
Erosion is serious, can directly influence machining accuracy.1997, there is scholar to propose dry EDM, i.e., made with compressed gas
For machining medium, it 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 electricity of electrical discharge machining in the medium
Pole is generally hollow edged electrode.But when processing fine structure or feature, the diameter of tool-electrode is typically needed generally below 100 μm
To make online, it is extremely difficult less than 100 μm of hollow edged electrode to produce external diameter online, even if can prepare online, due to micro-
The throttle effect of aperture, it is also difficult to which the micropore by diameter less than 100 μm is passed through processing gas used enough into processing gap
Stream, this make it that entering electric spark fine structure in promoting the circulation of qi using the mode of interior jet processes relatively difficult to achieve.Thereafter, though there is scholar's use
The mode of external aeration, enters electric spark capillary processing in promoting the circulation of qi and studies, but less effective, and short circuit ratio is high in processing, export license
Serious (LI L Q, ZHU G Z 2011.Investigate on Micro-EDM in Air (dry MEDM) (more than 30%)
by External Blowing Mode Based on RC Pulse Generator[J]Advanced Materials
Research 317-319:334-340.).Cold-plasma jet under atmospheric pressure is sprayed onto between electrode and workpiece and is used as processing
Medium, can obtain from liquid, dry EDM different processing effect.The reality of Application No. 201610874299.2
A kind of electric discharge machining method based on cold-plasma jet is described with new patent.When being processed using this method, interpolar
State, processing efficiency and working gas flow are closely bound up, to obtain preferable interpolar state and higher processing efficiency needs
Using the high-purity gas of larger flow to remove the galvanic corrosion product produced in processing, if but relying solely on to produce cold plasma
The high-purity gas of body jet, then cost is very high.Therefore it can help to remove galvanic corrosion product using other ancillary methods, and on this
The correlative study of aspect, is not reported so far.
Utility model content
The utility model is directed to a kind of device for improving electrical discharge machining efficiency in atmosphere cold plasma jet,
The equipment is simple, with low cost, do not have infringement to environment, is a kind of sustainable manufacturing method.One kind improves atmosphere cold plasma
The blending agent that the method for electrical discharge machining efficiency is constituted using coaxial high speed jet and cold-plasma jet in body jet is made
For electrical discharge machining medium, the introducing of coaxial high speed jet can increase rate-of flow, accelerate the discharge of galvanic corrosion product, so as to change
Kind interpolar state, improves its processing efficiency.
The utility model additionally provides a kind of device for being used to produce the blending agent, and the apparatus structure is simple, cost
It is cheap, easy to operate, it is safe and reliable.
The technical solution of the utility model：
A kind of device for improving electrical discharge machining efficiency in atmosphere cold plasma jet, in electric spark machine tool base
On plinth, cold-plasma jet and coaxial high speed jet complex generator are set up；
Described cold-plasma jet includes cold-plasma jet and same with coaxial high speed jet complex generator
Axle high-speed jet is combined generating assembly 9, number one gas mass flow controller 14, number one pressure-reducing valve 15, high-purity work gas
Source 16, No. second gas mass flow controller 17, No. second pressure-reducing valve 18, high-pressure air source 19, high voltage power supply 20 and universal solid
Fixed rack 21；
High-purity work source of the gas 16 enters cold through number one pressure-reducing valve 15 and number one gas mass flow controller 14 successively
Plasma jet is combined generating assembly 9 with coaxial high speed jet, and recycling high voltage power supply 20 is to cold-plasma jet and together
The multiple input voltage of generating assembly 9 of axle high-speed jet is generation cold-plasma jet 10；High-pressure air source 19 is then successively through No. second
Pressure-reducing valve 18 and No. second gas mass flow controller 17 enter cold-plasma jet and the compound generation of coaxial high speed jet
Component 9 generates coaxial high speed jet；The mixing of cold-plasma jet 10 and coaxial high speed jet is blending agent 11；Pass through
Cold-plasma jet and coaxial high speed jet are combined generating assembly 9 and are fixed to electric spark machine tool by Universal fixed support 21
On, and utilize its adjusting position；
Cold-plasma jet and coaxial high speed jet are combined generating assembly 9, including coaxial high speed jet nozzle 9-1, close
Cylinder 9-4, pin electrode 9-5, insulation nozzle 9-6 and electric discharge nozzle 9-7 in block head 9-2, end cap 9-3, nozzle；Cylinder 9-4 in nozzle
For cylindrical structure, its axis is provided with a blind hole, for installing pin electrode 9-5, in order to ensure the axiality of the two and make
Pin electrode 9-5 is not fallen off during, and the tight slightly less interference fit of interference fits or the magnitude of interference is selected between the two；Herein
Several through holes parallel to cylinder 9-4 axis in nozzle are also evenly equipped with around blind hole, for being passed through high-purity working gas；In nozzle
Cylinder 9-4 is additionally provided with through hole perpendicular to its axis, and the through hole not only can be by accessories such as metal jackscrews by high voltage power supply 20
High-voltage output line be connected with pin electrode 9-5, pin electrode 9-5 can also be carried out further fixed with clamping；Cylinder in nozzle
9-4 front end is provided with internal thread, and rear end is provided with external screw thread, and the internal thread of front end and electric discharge nozzle 9-7 external screw thread, which coordinate, to be installed,
The nozzle 9-7 that discharges is hollow revolving body, and in order to produce compression to air-flow, the inner surface of electric discharge nozzle 9-7 front ends is circle
There is a through hole conical surface, the center of front end, as electric discharge nozzle 9-7 outlet, ejects plasma jet 10, is protected during installation
The outlet for demonstrate,proving pin electrode 9-5 and the nozzle 9-7 that discharges is coaxial, to ensure to produce stable, uniform cold-plasma jet；In nozzle
The external screw thread of cylinder 9-4 rear ends is then connected with the screwed hole of end cap 9-3 front ends；End cap 9-3 is a hollow cylindric knot
Structure, its rear end is provided with screwed hole, the screwed hole of rear end and the outlet tracheae of number one gas mass flow controller 14 and its matches somebody with somebody
Bell and spigot joint is connected；End cap 9-3 is in addition to the respective screwed hole in front and back end, and it is additionally provided with external screw thread and seal plug 9-2 rear ends
Screwed hole is connected；Rotary structure also generally hollow seal plug 9-2, screwed hole and the insulation nozzle 9-6 of its front end
External screw thread connection, insulation nozzle 9-6 structure is similar with electric discharge nozzle 9-7, and its front end also has one on axis
Through hole, for ensuring the normal ejection for not influenceing plasma jet 10, ensures that the through hole goes out with electric discharge nozzle 9-7 during installation
It is mouthful coaxial, while in order to ensure sealing, screw thread is rotated when insulation nozzle 9-6 is installed and is contacted with electric discharge nozzle 9-7 to it；It is close
Block head 9-2 is additionally provided with 2 cabling channels parallel with its center axis, the high voltage power supply being connected to arrange with pin electrode 9-5
Line and the low-tension supply line being connected with electric discharge nozzle 9-7；Seal plug 9-2 external screw thread and coaxial high speed jet nozzle 9-1 ends
The screwed hole at end, which coordinates, to be installed；Coaxial high speed jet nozzle 9-1 is located at cold-plasma jet and the compound hair of coaxial high speed jet
The outermost of raw component 9, its structure is also similar with electric discharge nozzle 9-7, is also hollow rotary structure；Coaxial high speed jet sprays
The inner surface of rear end is the face of cylinder in mouth 9-1, and the inner surface of front end is circular conical surface, in order to eject blending agent 11 or pure
Plasma jet 10, front end equally offers the through hole on central axis, and the through hole should spray with electric discharge after installation
Mouth 9-7 outlet and insulation nozzle 9-6 outlet are coaxial；Coaxial high speed jet nozzle 9-1 side also has one perpendicular to it
The through hole of central axis, is connected by tracheae and supporting joint with the outlet of No. second gas mass flow controller 17, is used
In being passed through coaxial gases at high pressure.
Coaxial high speed jet nozzle 9-1, seal plug 9-2 and end cap 9-3 to material without particular/special requirement, using machinability
Good material, it is typically nonmetallic from common polytetrafluoroethylene (PTFE), PMMA, nylon etc. in order to reduce cost, mitigate deadweight
Material.
Pin electrode 9-5 requires that material conductivity is good, fusing point is high, heat/corrosion resistance good, such as：The metals such as tungsten bar, tungsten carbide
Material.
Cylinder 9-4 and insulation nozzle 9-6 requires that insulation resistance is good in nozzle, and is insulated when temperature is more than 200 DEG C
Performance will not be decreased obviously, therefore can select the materials such as PEEK, polytetrafluoroethylene (PTFE).
As long as the good material of nozzle 9-7 good conductivities, the machining property of discharging, can select brass etc..
A kind of method for improving electrical discharge machining efficiency in atmosphere cold plasma jet, utilizes cold-plasma jet
The blending agent of cold-plasma jet and coaxial high speed jet is generated with coaxial high speed jet complex generator；During work,
Tool-electrode is connect to the negative pole of impulse generator, workpiece connects the positive pole of impulse generator, by cold-plasma jet and coaxially
The blending agent of high-speed jet is applied between tool-electrode and workpiece, and adjustment nozzle location ensures that region to be processed is flooded completely
Not in blending agent, and work in-process will not be interfered with lathe.Movement instruction is passed to by control computer
Machine tool motion platform, and feed speed etc. is adjusted according to processing feedback signal in time.Cold plasma is closed after machining to penetrate
Stream and coaxial high speed jet complex generator and electric spark machine tool.
The beneficial effects of the utility model：In the utility model blending agent used be atmosphere cold plasma jet with
Coaxial high speed jet is constituted.The addition of coaxial high speed jet can greatly improve the flow of machining medium, so as to accelerate galvanic corrosion
The discharge of product, improves interpolar state, reduces short circuit ratio, improves its processing efficiency.Coaxial high speed jet do not required purity,
Can be any explosive compression gas medium of nontoxic, non-flammable, common compressed air, so cost is extremely cheap；
The blending agent can retain a large amount of ions being enriched with cold-plasma jet, electronics, excited atom, molecule isoreactivity grain
Son so that the spark discharge ratio between workpiece and electrode is more easy to occur in pure compression gas jet, between the larger electric discharge of acquisition
Gap, so as to obtain than more preferable interpolar discharge state in pure compression gas jet.Therefore, the utility model can be in identical processing energy
Under amount, the higher material removing rate of electrical discharge machining in purer atmosphere cold plasma jet is obtained with relatively low cost, and
Compared with more preferable surface quality in compressed gas.In addition, the blending agent obtains easy, and environment is not damaged, its macroscopic view
Temperature as little as room temperature or slightly above room temperature, will not also treat machining area metal material surface and cause fire damage.
Brief description of the drawings
Fig. 1 is device therefor structure composition and connection diagram in the utility model embodiment.
Fig. 2 cold-plasma jet used and the compound generating assembly installation diagram of coaxial high speed jet and is connected in embodiment
Schematic diagram.
Fig. 3 is empty in nitrogen cold-plasma jet, nitrogen cold-plasma jet and coaxial high speed respectively in embodiment
The material of electrical discharge machining in gas jet mixing medium, nitrogen jet current, nitrogen jet current and coaxial high speed air-spray blending agent
Clearance MRR comparison diagrams.
Fig. 4 is empty in nitrogen cold-plasma jet, nitrogen cold-plasma jet and coaxial high speed respectively in embodiment
The surface of electrical discharge machining in gas jet mixing medium, nitrogen jet current, nitrogen jet current and coaxial high speed air-spray blending agent
Roughness Ra value is contrasted.
In figure：1 lathe base；2 control computers；3A/D transition cards；4 interpolar condition checkout gears；
5XYZ three-shaft linkage motion platforms；6 impulse generators；7 live spindles；8 tool-electrodes；
9 cold-plasma jets are combined generating assembly with coaxial high speed jet；9-1 coaxial high speed jet nozzles；
9-2 seal plugs；9-3 end caps；Cylinder in 9-4 nozzles；9-5 pin electrodes；9-6 insulation nozzles；
9-7 electric discharge nozzles；10 cold-plasma jets；11 blending agents；12 workpiece；
13 work holders；14 number one gas mass flow controllers；15 number one pressure-reducing valves；
16 high-purity work sources of the gas；17 No. second gas mass flow controllers；18 No. second pressure-reducing valves；
19 high-pressure air sources；20 high voltage power supplies；21 Universal fixed supports.
Embodiment
Below in conjunction with accompanying drawing and technical scheme, embodiment of the present utility model is further illustrated.
The utility model be related to it is a kind of improve atmosphere cold plasma jet in electrical discharge machining efficiency method and its
Device, equipment used is electric spark machine tool, cold-plasma jet and coaxial high speed jet complex generator.Electric fire
Flower machining tool includes：Lathe base 1, control computer 2, A/D transition cards 3, interpolar condition checkout gear 4, XYZ three-shaft linkages
Motion platform 5, impulse generator 6, live spindle 7, tool-electrode 8, workpiece 12, work holder 13.
Cold-plasma jet includes with coaxial high speed jet complex generator：Cold-plasma jet and coaxial high speed
Jet is combined generating assembly 9, number one gas mass flow controller 14, number one pressure-reducing valve 15, high-purity work source of the gas 16,
No. two gas mass flow controllers 17, No. second pressure-reducing valve 18, high-pressure air source 19, high voltage power supply 20, Universal fixed supports 21.
Cold-plasma jet is combined generating assembly 9 with coaxial high speed jet to be included：It is coaxial high speed jet nozzle 9-1, close
Cylinder 9-4, pin electrode 9-5, insulation nozzle 9-6, electric discharge nozzle 9-7 in block head 9-2, end cap 9-3, nozzle.
Carry out before electrical discharge machining, connect these equipment respectively according to accompanying drawing：
Generating assembly 9 is combined according to accompanying drawing 2 to cold-plasma jet and coaxial high speed jet to assemble.Cylinder in nozzle
9-4 is cylindrical structure, and its axis is provided with a blind hole, for installing pin electrode 9-5, in order to ensure the axiality of both
Do not fall off, matched somebody with somebody between them from the tight slightly less interference of interference fits or the magnitude of interference with pin electrode 9-5 during use
Close；Also be evenly equipped with around this blind hole it is several parallel to nozzle in cylinder 9-4 axis through hole, for being passed through high-purity work gas
Body；Cylinder 9-4 is additionally provided with the through hole perpendicular to its axis in nozzle, and the through hole not only can be by accessories such as metal jackscrews by height
The high-voltage output line of voltage source 20 is connected with pin electrode 9-5, pin electrode 9-5 can also be carried out further fixed with clamping；
Cylinder 9-4 front end is provided with internal thread in nozzle, and rear end is provided with external screw thread, the external screw thread of the internal thread and electric discharge nozzle 9-7 of front end
Coordinate and install, electric discharge nozzle 9-7 is hollow revolving body, in order to produce compression to air-flow, the interior table for the spray nozzle front end that discharges
Face is circular conical surface, and there is a through hole center of front end, ejects plasma jet 10 as electric discharge nozzle 9-7 outlet, pacifies
It need to ensure that pin electrode 9-5 and the nozzle 9-7 that discharges outlet are coaxial during dress, to ensure to produce stabilization, uniform cold plasma
Body jet；The external screw thread of cylinder 9-4 rear ends is then connected with the screwed hole of end cap 9-3 front ends in nozzle；End cap 9-3 is in one
Empty cylinder-like structure, its rear end is provided with screwed hole, and screwed hole and the number one gas mass flow controller 14 of rear end are exported
It is connected with tracheae and its complementary connector；In addition to the respective screwed hole in front and back end, end cap 9-3 is additionally provided with external screw thread and seal plug
The screwed hole of 9-2 rear ends is connected；Rotary structure also generally hollow seal plug 9-2, the screwed hole of its front end with absolutely
Edge nozzle 9-6 external screw thread connection, insulation nozzle 9-6 structure is similar with the nozzle 9-7 that discharges, and its front end also has one to be located at
Through hole on axis, for ensuring the normal ejection for not influenceing plasma jet 10, ensures that the through hole sprays with electric discharge during installation
Mouth 9-7 outlet is coaxial, while in order to ensure sealing, screw thread is rotated when installing insulation nozzle 9-6 to itself and electric discharge nozzle
9-7 is contacted；Seal plug 9-2 is additionally provided with 2 cabling channels parallel with its center axis, is connected to arrange with pin electrode 9-5
High-voltage power-line and with the low-tension supply lines that are connected of electric discharge nozzle 9-7；Seal plug 9-2 external screw thread and coaxial high speed jet
The screwed hole of nozzle 9-1 ends, which coordinates, to be installed.Coaxial high speed jet nozzle 9-1 is penetrated positioned at cold-plasma jet with coaxial high speed
The outermost of the compound generating assembly of stream, its structure is also similar with electric discharge nozzle 9-7, is also hollow rotary structure.Middle rear end
Inner surface be the face of cylinder, the inner surface of front end is circular conical surface, is penetrated to eject blending agent 11 or pure plasma
Stream 10, front end equally offers the through hole on central axis, the outlet that the through hole should be with the nozzle 9-7 that discharges after installation
And insulation nozzle 9-6 outlet is coaxial；Coaxial high speed jet nozzle 9-1 side also has one perpendicular to the logical of its center axis
Hole, is connected by tracheae and supporting joint with the outlet of No. second pressure-reducing valve 18, the coaxial gases at high pressure for being passed through.
Treat that cold-plasma jet is combined after the completion of the assembling of generating assembly 9 with coaxial high speed jet, by high-purity work source of the gas
16th, number one pressure-reducing valve 15, number one gas mass flow controller 14, end cap 9-3 and high-pressure air source 19, No. second pressure-reducing valve
18th, No. second gas mass flow controller 17, coaxial high speed jet nozzle 9-1 pass through gas according to the order of connection shown in the drawings
Pipe and its complementary connector connection.
Cold-plasma jet is combined generating assembly 9 with coaxial high speed jet and once assembly be completed, unless repaired or changed
Make, typically need not again dismantle, reassemble, it is only necessary to once assemble, later directly use.Cold-plasma jet with it is same
Axle high-speed jet is combined generating assembly 9 and number one pressure-reducing valve 15, number one gas mass flow controller 14, high-pressure air source
19th, supporting air supply system and the high voltage power supply 20 and ten thousand such as No. second pressure-reducing valve 18, No. second gas mass flow controller 17
To the connection of fixed support 21 or after being completed, except special circumstances such as non-replaceable source of the gas, maintenance or transformations, typically also without
Reconnect, using pass hull closure in order after finishing, directly start use next time.
Tool-electrode 8 is installed in live spindle 7, and live spindle 7 is connected with XYZ three-shaft linkages motion platform 5；Workpiece 12
It is installed on work holder 13, XYZ three-shaft linkages motion platform 5 and work holder 13 are fixed to by T-slot
Onto lathe base 1.Cold-plasma jet is combined generating assembly 9 with coaxial high speed jet and passes through Universal fixed support 21 and machine
Bed pedestal 1 is connected, and cold-plasma jet and the compound generating assembly 9 of coaxial high speed jet are adjusted by Universal fixed support 21
Position and angle.
Coaxial high speed jet nozzle 9-1, seal plug 9-2 and end cap 9-3 to material without particular/special requirement, using machinability
Good material, it is typically nonmetallic from common polytetrafluoroethylene (PTFE), PMMA, nylon etc. in order to reduce cost, mitigate deadweight
Material.Pin electrode 9-5 requires that material conductivity is good, fusing point is high, heat/corrosion resistance good, such as：The metal materials such as tungsten bar, tungsten carbide
Material.Cylinder 9-4 and insulation nozzle 9-6 require that insulation resistance is good in nozzle, and insulating properties are not when temperature is more than 200 DEG C
It can be decreased obviously, therefore can select the materials such as PEEK, polytetrafluoroethylene (PTFE).As long as nozzle 9-7 good conductivities of discharging, machining
The good material of performance, can select brass etc..
During work, the both positive and negative polarity of workpiece 12 and tool-electrode 8 respectively with impulse generator 6 is connected；Pin electrode 9-5 and electric discharge
High-voltage output ends of the nozzle 9-7 respectively with high voltage power supply 20 is connected with low-voltage output.
High-purity work source of the gas 16 is opened, regulation number one pressure-reducing valve 15 makes high-purity work gas that high-purity work source of the gas 16 is exported
Body enters number one gas mass flow controller 14 with suitable pressure, regulation number one gas mass flow controller 14 to
Desired value, now high-purity working gas will enter end cap 9-3 with the flow of setting, then enter pin electricity by cylinder 9-4 in nozzle
Pole 9-5 and electric discharge nozzle 9-7 compositions region of discharge.Now, high voltage power supply 20 is opened, its voltage and frequency is adjusted to suitable
Value, will produce stable cold-plasma jet 10 in electric discharge nozzle 9-7 exit.Open high-pressure air source 19, regulation the
No. two pressure-reducing valves 18 and No. second gas mass flow controller 17 are to setting value, it is ensured that the gases at high pressure that high-pressure air source 19 is exported
Coaxial high speed jet nozzle 9-1 is entered from side with suitable pressure and flow, now in cold-plasma jet and coaxial height
The exit that rapid fire stream is combined generating assembly 9 will form blending agent 11.Cold plasma is adjusted by Universal fixed support 21
Body jet is combined the position of generating assembly 9 with coaxial high speed jet, it is ensured that machining area can be completely covered simultaneously in blending agent 11
And will not other positions are interfered with lathe in process.Open impulse generator 6, regulation to suitable processing ginseng
Number, opens control computer 2 and movement instruction is passed into XYZ three-shaft linkages motion platform 5 and live spindle 7, XYZ three-shaft linkages
Motion platform 5 and live spindle 7 process specific structure and feature according to movement instruction on work piece 12, while interpolar state
The discharge signal detected through A/D transition cards 3 can be passed to control computer 2 by detection means 4, the then basis of control computer 2
Discharge signal adjusts movement instruction immediately, to ensure the stable progress of electro-discharge machining.After machining, high voltage power supply is closed successively
20th, high-purity work source of the gas 16, number one gas mass flow controller 14, high-pressure air source 19, No. second gas mass flow control
Device 17 processed, control computer 2.
Embodiment
The example of the fine groove experiment of electric spark milling will be combined, illustrate the utility model to electricity fire in cold-plasma jet
The influence of flower processing characteristics.Experimental facilities is connected according to shown in Fig. 1, Fig. 2 first.The material of tool-electrode 8 in the present embodiment
For tungsten, the material of workpiece 12 is H62 brass, and high-purity work source of the gas 16 uses purity for 99.999% high pure nitrogen, high pressure gas
Source 19 uses air compressor, that is, coaxial high speed jet used is compressed air jet in testing.Electrical discharge machining medium point
Not Wei nitrogen cold-plasma jet, nitrogen cold-plasma jet and coaxial high speed air-spray blending agent, nitrogen jet current,
Nitrogen jet current and coaxial high speed air-spray blending agent.Pulse power type selection is the RC pulse powers.Machining energy is distinguished
It is set to voltage 100V electric capacity 8200pF and voltage 80V electric capacity 3300pF.Adjust number one pressure-reducing valve 15 and number one gas matter
Measure flow controller 14 so that the gas flow for entering the compound generating assembly 9 of cold-plasma jet and coaxial high speed jet is
15slm.Open high voltage power supply 20, gradually step up its output voltage, adjust discharge frequency, until cold-plasma jet with it is coaxial
The outlet that high-speed jet is combined generating assembly 9 produces stable cold-plasma jet 10, opens high-pressure air source 19, regulation second
Number pressure-reducing valve 18 and No. second gas mass flow controller 17 make high-velocity jets flow be 47.5slm, produce mixing and are situated between
Matter 11；By Universal fixed support 21 adjust cold-plasma jet and coaxial high speed jet be combined generating assembly 9 position and
Angle, makes region to be processed be submerged in completely in blending agent 11, and ensures coaxial cold-plasma jet and coaxial high speed
Jet is compound, and generating assembly 9 will not other positions be interfered with lathe in process.Now can will be prepared in advance good
NC codes input control computer 2, start lathe carry out spark discharge processing.
Fig. 3 be open-circuit voltage 100V electric capacity 8200pF and open-circuit voltage 80V electric capacity 3300pF under, in different machining mediums
In, material removing rate MRR contrasts, the machining experiment failure because of sequential short circuit, therefore do not carry out in nitrogen jet current
Material removing rate MRR is calculated, from figure 2 it can be seen that nitrogen cold-plasma jet and high-speed air under equal discharging condition
Material removing rate MRR in the blending agent of jet is penetrated with material removing rate MRR, the nitrogen in simple cold-plasma jet
Stream is compared with the material removing rate MRR in the blending agent of high-velocity jets, is substantially improved.
Fig. 4 be open-circuit voltage 100V electric capacity 8200pF and open-circuit voltage 80V electric capacity 3300pF under, in different machining mediums
In, the roughness Ra value contrast of finished surface.Because the machining experiment in nitrogen jet current is because sequential short circuit and failure, because
This does not also carry out roughness Ra value measurement.From figure 3, it can be seen that under same discharging condition, nitrogen cold plasma is penetrated
Though the Ra in stream and the blending agent of high-velocity jets has small size rising compared with the Ra in simple cold-plasma jet,
But still far below the Ra values in nitrogen jet current and the blending agent of high-velocity jets.
Therefore atmosphere cold plasma jet and the blending agent of high-velocity jets are used as electro-discharge machining medium,
The processing efficiency higher than pure cold-plasma jet can be obtained, than nitrogen jet current and the blending agent of high-velocity jets more
Good crudy.
Applicant states that above-described embodiment of the present utility model is used for the purpose of clearly illustrating the act that the utility model is made
Example, and the not restriction to embodiment of the present utility model.For those of ordinary skill in the field, stated upper
Other various forms of changes or variation can also be made on the basis of bright, there is no need and unable to give all embodiments
With exhaustion.All any modifications made within spirit of the present utility model and principle, equivalent spy change and improved, and all should include
Within the scope of the utility model claim.
Claims (8)
1. a kind of device for improving electrical discharge machining efficiency in atmosphere cold plasma jet, it is characterised in that in electric spark
On the basis of machining tool, cold-plasma jet and coaxial high speed jet complex generator are set up；
Described cold-plasma jet includes cold-plasma jet and coaxial height with coaxial high speed jet complex generator
Rapid fire stream is combined generating assembly (9), number one gas mass flow controller (14), number one pressure-reducing valve (15), high-purity work
Source of the gas (16), No. second gas mass flow controller (17), No. second pressure-reducing valve (18), high-pressure air source (19), high voltage power supply
And Universal fixed support (21) (20)；
High-purity work source of the gas (16) enters through number one pressure-reducing valve (15) and number one gas mass flow controller (14) successively
Cold-plasma jet is combined generating assembly (9) with coaxial high speed jet, recycles high voltage power supply (20) to penetrate cold plasma
Stream is generation cold-plasma jet (10) with multiple generating assembly (9) input voltage of coaxial high speed jet；High-pressure air source (19) is then
Successively through No. second pressure-reducing valve (18) and No. second gas mass flow controller (17) enter cold-plasma jet with it is coaxial
High-speed jet is combined generating assembly (9) generation coaxial high speed jet；Cold-plasma jet (10) is mixed with coaxial high speed jet
It is blending agent (11) to close；Cold-plasma jet and coaxial high speed jet are combined by Universal fixed support (21) and occurred
Component (9) is fixed on electric spark machine tool, and utilizes its adjusting position；
Cold-plasma jet and coaxial high speed jet are combined generating assembly (9), including coaxial high speed jet nozzle (9-1), close
Cylinder (9-4), pin electrode (9-5), insulation nozzle (9-6) and electric discharge nozzle (9-7) in block head (9-2), end cap (9-3), nozzle；
Cylinder (9-4) is cylindrical structure in nozzle, and its axis is provided with a blind hole, for installing pin electrode (9-5), in order to ensure two
Pin electrode (9-5) is not fallen off during the axiality of person and use, between the two from tight slightly interference fits or the magnitude of interference compared with
Small interference fit；Also be evenly equipped with around this blind hole it is several parallel to nozzle in cylinder (9-4) axis through hole, for being passed through
High-purity working gas；Cylinder (9-4) is additionally provided with the through hole perpendicular to its axis in nozzle, and the through hole is applied not only to by metal roof
The high-voltage output line of high voltage power supply (20) is connected by silk accessory with pin electrode (9-5), also pin electrode (9-5) is carried out further
Fixed and clamping；The front end of cylinder (9-4) is provided with internal thread in nozzle, and rear end is provided with external screw thread, and internal thread and the electric discharge of front end are sprayed
The external screw thread of mouth (9-7), which coordinates, to be installed, and electric discharge nozzle (9-7) is hollow revolving body, in order to produce compression to air-flow, is put
The inner surface of EFI mouth (9-7) front end is circular conical surface, and there is a through hole center of front end, as the outlet of electric discharge nozzle (9-7),
Cold-plasma jet (10) is ejected, ensures that the outlet of pin electrode (9-5) and electric discharge nozzle (9-7) is coaxial during installation, to protect
Card produces stable, uniform cold-plasma jet (10)；In nozzle the external screw thread of cylinder (9-4) rear end then with before end cap (9-3)
The screwed hole at end is connected；End cap (9-3) is a hollow cylinder-like structure, and its rear end is provided with screwed hole, the spiral shell of rear end
Pit is connected with number one gas mass flow controller (14) outlet with tracheae and its complementary connector；End cap (9-3) is except preceding
Outside the respective screwed hole in rear end, it is additionally provided with external screw thread and the screwed hole of seal plug (9-2) rear end is connected；Seal plug
(9-2) also generally hollow rotary structure, the screwed hole of its front end is connected with the external screw thread of insulation nozzle (9-6), insulation spray
The structure of mouth (9-6) is identical with electric discharge nozzle (9-7), and also there is a through hole being located on axis its front end, for ensuring not
The normal ejection of cold-plasma jet (10) is influenceed, ensures that the outlet of the through hole and electric discharge nozzle (9-7) is coaxial during installation, together
When in order to ensure sealing, screw thread is rotated when insulation nozzle (9-6) is installed and is contacted with electric discharge nozzle (9-7) to it；Seal plug
Head (9-2) is additionally provided with 2 cabling channels parallel with its center axis, the high voltage power supply being connected to arrange with pin electrode (9-5)
Line and the low-tension supply line being connected with electric discharge nozzle (9-7)；The external screw thread of seal plug (9-2) and coaxial high speed jet nozzle
The screwed hole of (9-1) end, which coordinates, to be installed；Coaxial high speed jet nozzle (9-1) is penetrated positioned at cold-plasma jet with coaxial high speed
The outermost of the compound generating assembly (9) of stream, its structure is also identical with electric discharge nozzle (9-7), is also hollow rotary structure；Together
The inner surface of rear end is the face of cylinder in axle high-speed jet nozzle (9-1), and the inner surface of front end is circular conical surface, in order to eject mixing
Medium (11) or pure cold-plasma jet (10), front end equally offers the through hole on central axis, after installation
The through hole should be coaxial with the outlet of electric discharge nozzle (9-7) and the outlet of insulation nozzle (9-6)；Coaxial high speed jet nozzle (9-1)
Side also have a through hole perpendicular to its center axis, pass through tracheae and supporting joint and No. second gas mass flow
The outlet of controller (17) is connected, the coaxial gases at high pressure for being passed through.
2. device according to claim 1, it is characterised in that described coaxial high speed jet nozzle (9-1), seal plug
The material of (9-2) and end cap (9-3) is nonmetallic materials.
3. device according to claim 1 or 2, it is characterised in that described pin electrode (9-5) is tungsten bar or tungsten carbide.
4. device according to claim 1 or 2, it is characterised in that cylinder (9-4) and insulation nozzle (9- in described nozzle
6) material is PEEK or polytetrafluoroethylene (PTFE).
5. device according to claim 3, it is characterised in that cylinder (9-4) and insulation nozzle (9-6) in described nozzle
Material is PEEK or polytetrafluoroethylene (PTFE).
6. the device according to claim 1,2 or 5, it is characterised in that the material of described electric discharge nozzle (9-7) is Huang
Copper.
7. device according to claim 3, it is characterised in that the material of described electric discharge nozzle (9-7) is brass.
8. device according to claim 4, it is characterised in that the material of described electric discharge nozzle (9-7) is brass.
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| CN201720026465.3U CN206445323U (en) | 2017-01-13 | 2017-01-13 | A kind of device for improving electrical discharge machining efficiency in atmosphere cold plasma jet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Granted publication date: 20170829 Termination date: 20190113 |