CN102046318B - Electric discharge machining apparatus and electric discharge machining method - Google Patents
Electric discharge machining apparatus and electric discharge machining method Download PDFInfo
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- CN102046318B CN102046318B CN200980119002XA CN200980119002A CN102046318B CN 102046318 B CN102046318 B CN 102046318B CN 200980119002X A CN200980119002X A CN 200980119002XA CN 200980119002 A CN200980119002 A CN 200980119002A CN 102046318 B CN102046318 B CN 102046318B
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- 238000000034 method Methods 0.000 title claims description 20
- 238000003754 machining Methods 0.000 title abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 42
- GFFGJBXGBJISGV-UHFFFAOYSA-N Adenine Chemical compound NC1=NC=NC2=C1N=CN2 GFFGJBXGBJISGV-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229930024421 Adenine Natural products 0.000 claims abstract description 22
- 229960000643 adenine Drugs 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims description 29
- 238000005260 corrosion Methods 0.000 abstract description 27
- 230000007797 corrosion Effects 0.000 abstract description 25
- 229910021645 metal ion Inorganic materials 0.000 abstract description 20
- 239000000956 alloy Substances 0.000 abstract description 17
- 229910045601 alloy Inorganic materials 0.000 abstract description 17
- 229910000831 Steel Inorganic materials 0.000 abstract description 14
- 239000010959 steel Substances 0.000 abstract description 14
- 229910009043 WC-Co Inorganic materials 0.000 abstract description 8
- 238000012545 processing Methods 0.000 description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 28
- 238000005204 segregation Methods 0.000 description 21
- 229910052742 iron Inorganic materials 0.000 description 14
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- 238000005516 engineering process Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
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- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 2
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- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/10—Supply or regeneration of working media
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/34—Working media
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Disclosed is an electric discharge machining apparatus that supplies an aqueous machining fluid to a machining gap (9) formed between a workpiece (W) constituted of a WC-Co super-hard alloy or steel and a tool electrode (E) while performing electric discharge machining on the workpiece. The electric discharge machining apparatus includes a power supply device (20) for applying an AC voltage pulse to the machining gap, an average gap voltage setting device (50) for setting the machining gap average voltage (Vmean) to the optimum value for preventing corrosion of the workpiece, and an adenine-adding device (70) for adding adenine to the machining fluid in order to adsorb corrosive metal ions.
Description
Technical field
The present invention relates to a kind of electric discharge device, it is through supplying with irritability liquid and machining gap is applied potential pulse and processing work the machining gap that is formed between tool-electrode and the electric conductivity workpiece.Especially, relate to that to prevent to be immersed in water be the electric discharge device of electrical erosion of the workpiece in the irritability liquid (being designated hereinafter simply as " working fluid ") on basis.
Background technology
Electric discharge device is used to make the metal pattern that is made up of hard material as a rule.Such metal pattern is made up of the alloy (below be called " iron and steel ") or the superhard alloy that with iron are principal component.Superhard alloy is that the powder to the metal carbide carries out roasting and the alloy that obtains.Well-known is carried out roasting and the superhard alloy that obtains to tungsten carbide tool (WC) with as the cobalt (Co) of bond.
Be known in the edm, in the workpiece that constitutes by iron and steel or superhard alloy, produce electrical erosion.The reason of electrical erosion is considered to be in as the tool-electrode of negative pole and as flowing through corrosion current and workpiece material generation segregation because of potential difference between the workpiece of positive pole.In addition, also be that corrosion metals ion in the working fluid makes workpiece produce corrosion sometimes.
Proposed to prevent the discharging processing machine of such electrical erosion.Patent documentation 1 discloses that workpiece is connected with the cathode side of external power source and to the external power source method of Workpiece supply corrosion protection electric current.Patent documentation 2 discloses the technology that working fluid is circulated in the anion exchange resin tower, wherein the anion exchange resin tower has been fixed the nitrite ion that is adsorbed on the corrosive ion.In order to keep the high resistivity of working fluid, the ion more than a kind in charcoal acid ion, charcoal acid hydrogen ion and the hydroxide ion is fixed in the anion exchange resin tower with nitrite ion.
Patent documentation 1: japanese kokai publication sho 58-137524 communique
Patent documentation 2: TOHKEMY 2002-301624 communique
Summary of the invention
In the anti-corrosion method of patent documentation 1, metal ion in working fluid from the anode segregation and be attached on the surface of the work.Its result, it is painted on workpiece, to produce undesirable burn into sometimes.The anti-corrosion method of patent documentation 2 is effective in the corrosion of the such passive metal of iron and steel prevents.But nitrite ion promotes the corrosion of superhard alloy sometimes.
The objective of the invention is to, prevent the segregation of workpiece material, and the inhibition metal ion is attached to surface of the work.Another object of the present invention is to provide a kind of electric discharge device and discharge-treating method that can prevent the corrosion of iron and steel parts and superhard alloy workpiece.
According to a side of the present invention, a kind of electric discharge device is provided, to the gap (9) that be formed at workpiece (W) and tool-electrode (E) between supply with working fluid on one side, carrying out the edm of workpiece on one side, this electric discharge device comprises:
Supply unit (20); Apply alternating voltage pulses to gap (9), said alternating voltage pulses is by being that positive potential and tool-electrode are that negative potential is the positive polarity voltage pulse that applies of positive polarity and is that negative potential and tool-electrode are that positive potential is that the reverse voltage pulse that antipolarity applies constitutes with the workpiece with the workpiece;
The gap voltage setting device, the average voltage (Vmean) in setting gap; And
Adenine adding set (70) adds adenine in working fluid.
The gap voltage setting device is preferably set gap voltage (Vmean) to a side of antipolarity.Like this, prevent the segregation of workpiece material.
Gap voltage setting device (50) also can be set the width of positive polarity voltage pulse or the width of reverse voltage pulse.Perhaps, gap voltage setting device (60) also can be set the width of positive polarity voltage pulse or the width of reverse voltage pulse.Like this, gap voltage (Vmean) correctly is set at optimum value.
Gap voltage setting device (60) also can comprise the 1st shunt that is connected to supply unit (20) with gap (9) parallelly connectedly.The 1st comprises along separate routes: only when the gap having been applied the positive polarity voltage pulse, make electric current pass through the 1st diode (64) of the 1st shunt; And the 1st switch (63) that is connected in series with the 1st diode.
Gap voltage setting device (60) also can comprise the 2nd shunt that is connected to supply unit (20) with gap (9) parallelly connectedly.The 2nd comprises along separate routes: only when the gap having been applied the reverse voltage pulse, make electric current pass through the 2nd diode (66) of the 2nd shunt; And the 2nd switch (65) that is connected in series with the 2nd diode.
The gap voltage setting device is preferably set gap voltage (Vmean) according to WC-Co superhard alloy, the such workpiece material of iron and steel.
According to another side of the present invention, a kind of discharge-treating method is provided, on one side working fluid is supplied with in the gap (9) that is formed between workpiece (W) and the tool-electrode (E), carry out the edm of workpiece on one side, comprise
Is that negative potential and tool-electrode are the step that a side of the antipolarity of positive potential is set with the average voltage (Vmean) in gap to workpiece; And
In working fluid, add the step of adenine.
According to the present invention, prevent to result from the corrosion of the segregation of workpiece material.Suppress metal ion and be attached to surface of the work, prevent the corrosion of workpiece and painted.Iron and steel parts and this two side's of superhard alloy workpiece corrosion can both prevent.
Description of drawings
Fig. 1 is the block diagram that the 1st embodiment of electric discharge device of the present invention is shown.
Fig. 2 is the circuit diagram that the electric discharge device of Fig. 1 is shown.
Fig. 3 is the sequential chart of action that the NC device of Fig. 1 is shown.
Fig. 4 is the block diagram that the working fluid circulatory system of Fig. 1 is shown.
Fig. 5 is the figure that the corrosion inhibitor adding set of Fig. 4 is shown.
Fig. 6 is the figure of the corrosion protection mechanism of explanation adenine.
Fig. 7 is the block diagram that the NC device of Fig. 1 is shown.
Fig. 8 is the flow chart that discharge-treating method of the present invention is shown.
Fig. 9 is the circuit diagram that the 2nd embodiment of electric discharge device of the present invention is shown.
(symbol description)
E: line electrode; W: workpiece; 1: wire electric discharge machine; 2: matrix; 3: cylinder; 4: processing head; 5: working groove; 6: work piece platform; 7: go up the pilot set body; 8: following pilot set body; 9: the gap; 10: the 1 supply units; 11: dc source; 12: switching transistor; 20: the 2 supply units; 21: dc source; 22: bridge circuit; 23: resistor; 24: diode; 25: switch; 26: dc source; 27: resistor; 28: diode; 29: switch; 34,35: cable; 40: the working fluid feed system; 42: ion exchange resin; 43: the working fluid temperature setting device; 47: the soiling solution groove; 48: filter; 49: Rinsing Area; The 50:NC device; 51: input unit; 52: save set; 53: treating apparatus; 54: the adenine control module; 55: the processing conditions setting module; 56: pulse control module; 57: the gap voltage detection module; 60: zero load voltage setting circuit; 61,63,65: switch; 64,66: diode; 67,68: resistor; 70: the corrosion inhibitor adding set; 71: pump; 72: dissolving tank; 73: distance piece; 76: packaging material; 77: corrosion inhibitor; 78: the protection coating film; 81,82,83,84: switching transistor.
The specific embodiment
Below, the 1st embodiment to discharging processing machine of the present invention describes with reference to accompanying drawing.Wire electric discharge machine of the present invention 1 is as shown in Figure 1.Establish from the rear portion of matrix 2 and to be provided with cylinder 3.Processing head 4 is installed in the front of cylinder 3.Working groove placed the front portion of matrix 2 in 5 years.Keep the work piece platform 6 of workpiece W to be housed in the working groove 5.Last pilot set body 7 is installed on the processing head 4, and following pilot set body 8 is installed in the front of cylinder 3.Work in-process, vertically mobile between a pair of pilot set body 7 and 8 as the line electrode E of tool-electrode, between portable cord electrode E and workpiece W, be formed with small gap 9.Wire electric discharge machine 1 possesses the working fluid circulatory system 40 from working fluid to gap 9 that supply with.
Wire electric discharge machine 1 possesses the 1st and the 2nd supply unit 10 and 20 to gap 9 supply capability pulses.As shown in Figure 2, the 1st supply unit 10 has dc source 11 and switching transistor 12.The cathode terminal of dc source 11 is connected to line electrode E through the suitable contact shoe in the pilot set body 7,8 about being housed in.The anode terminal of dc source 11 is connected to workpiece W via switching transistor 12.Wire electric discharge machine 1 possesses the NC device 50 that the working fluid circulatory system 40 and the 1st and the 2nd supply unit 10 and 20 are controlled.The action of switching transistor 12 is by 50 controls of NC device.
The 2nd supply unit 20 has the dc source 21 of 80V and the bridge circuit 22 that is made up of 4 switching transistors 81,82,83 and 84.Switching transistor 81,82,83 and 84 forms 4 tie point A, B, C, D and is connected in series between adjacent transistors.Switching transistor 81 and 82 tie point A are connected to the cathode terminal of dc source 21.Switching transistor 82 and 83 tie point B are connected to workpiece W via cable 35.Switching transistor 83 and 84 tie point C are connected to the anode terminal of dc source 21 via resistor 23, diode 24 and switch 25.Switching transistor 84 and 81 tie point D are connected to line electrode E via cable 34.The action of switch 25 and switching transistor 81,82,83 and 84 is by 50 controls of NC device.
Workpiece W is that positive potential and line electrode E are that the polarity of negative potential is called as positive polarity.Workpiece W is that negative potential and line electrode E are that the polarity of positive potential is called as antipolarity.
With reference to Fig. 3, the action of NC device 50 is described.Fig. 3 illustrates voltage between workpiece W and the line electrode E (below be called " gap voltage ") Vgap.
At moment t1, NC device 50 cut-off switch 25, make switching transistor 81 and 83 conductings, switching transistor 82 and 84 is ended.Its result, the potential pulse of dc source 21 is applied to gap 9 with positive polarity.At the moment t2 from moment t1 elapsed time ND, NC device 50 makes switching transistor 82 and 84 conductings, switching transistor 81 and 83 is ended.Like this, the potential pulse of dc source 21 is applied to gap 9 with antipolarity.
At the moment t3 from moment t2 elapsed time RD, NC device 50 makes switching transistor 81 and 83 conductings once more, switching transistor 82 and 84 is ended.Like this, through the conduction and cut-off switch motion of switching transistor 81,82,83 and 84, the potential pulse that the 2nd supply unit 20 can repeat to change to each pulse polarity (below be called " alternating voltage pulses ") also is applied to gap 9.
In gap 9, produce the moment t4 of discharge, NC device 50 makes switch 25 and switching transistor 81,82,83 and 84 end, make switching transistor 12 conductings.Like this, the 1st supply unit 10 end voltage apply, the 2nd supply unit 20 begins to supply with electric currents to gap 9.At the moment t5 from moment t4 process ON time ON, NC device 50 ends switching transistor 12, and the 2nd supply unit 20 finishes electric current supplies.
At the moment t6 from moment t5 process OFF deadline, the 1st supply unit 10 begins potential pulse is applied to gap 9 once more.The aggregate-value of the potential pulse of NC device 50 through making among Fig. 3 the band oblique line is consistent with servo reference voltage SV and the size in gap 9 is maintained certain value.
In NC device 50, set the width ND of positive polarity voltage pulse, width RD, ON time ON, OFF time and the servo reference voltage SV of reverse voltage pulse.Pulse width ND among Fig. 3 and RD are set at equal, and the average Vmean of gap voltage Vgap roughly is 0V.Reference symbol NV among Fig. 3 representes the zero load voltage of positive polarity voltage pulse.Reference symbol RV representes the zero load voltage of reverse voltage pulse.Though zero load voltage is that gap 9 is applied with voltage but voltage when producing discharge.
If gap voltage Vmean moves to a side of antipolarity (among Fig. 3-side), then become the tendency that the metal ion that adheres to workpiece W increases, on the other hand, become the tendency that the segregation of workpiece material is lowered.If gap voltage Vmean moves to a side of positive polarity (among Fig. 3+side), then become the tendency that the metal ion that adheres to workpiece W reduces, on the other hand, become the tendency that the segregation of workpiece material increases.
Through at least one side among pulse width ND, the RD is changed, can make the mean variation of gap voltage Vgap.For example, through making pulse width ND, can make the mean value deflection positive polarity side of gap voltage Vgap greater than pulse width RD.Through making pulse width RD, can make the mean value deflection antipolarity side of gap voltage Vgap greater than pulse width ND.
The 2nd supply unit 20 also possesses in non-processing the dc source 26 of gap 9 being supplied with the 15V of a series of alternating voltage pulses.Dc source 26 is connected to gap 9 concurrently with dc source 21.The cathode terminal of dc source 26 is connected to the tie point A in the bridge circuit 22, and the anode terminal of dc source 26 is connected to the tie point C in the bridge circuit 22 via switch 29, diode 28 and resistor 27.The output voltage of dc source 26 is set to and in non-processing, in gap 9, does not produce the such value of discharge, is set at the absolute value less than the output voltage of dc source 21.
As shown in Figure 4, working fluid feed system 40 will be stored into the soiling solution groove 47 from the working fluid that working groove 5 is discharged.Processing in the soiling solution groove 47 is stored in the Rinsing Area 49 by filter 48 limpidization.Working fluid feed system 40 is through ion exchange resin 42, working fluid temperature setting device 43, and pH, temperature and the resistivity of working fluid is maintained setting value.And then working fluid feed system 40 is supplied with the working fluid of the corrosion inhibitor that has added ormal weight through corrosion inhibitor adding set 70 to working groove 5.
As shown in Figure 5, corrosion inhibitor adding set 70 possesses pump 71 and dissolving tank 72.In dissolving tank 72, corrosion inhibitor 77 is dissolved in the working fluid.Netted distance piece 73 is divided into the upper and lower with dissolving tank 72.Working fluid in the Rinsing Area 49 supplies to the bottom of dissolving tank 72 through pump 71.
On the top of dissolving tank 72, contain pulverous corrosion inhibitor 77 by packaging material 76 packings.Packaging material 76 are the nonwoven that for example have water flowing property.The concentration of the corrosion inhibitor in the working fluid can be controlled through the discharge-amount of regulating pump 71.Corrosion inhibitor adding set 70 adds the pulverous adenine (adenine) shown in the Chemical formula 1 (CAS accession designation number 73-24-5) in the working fluid to as corrosion inhibitor.
[Chemical formula 1]
As shown in Figure 6, in working groove 5, in working fluid, produce metal ions such as copper ion from processing bits, line electrode E.Adenine and metal ion reaction, and form metal fluor-complex such shown in the Chemical formula 2.Its result, the lip-deep metal ion that is attached to workpiece W reduces.In addition, adenine forms protection epithelium 78 and oxidation, the segregation that reduces workpiece W is also had certain effect on the surface of workpiece W.Like this, no matter how the material of workpiece W can both suppress adhering to of metal ion.Effect to the adenine of workpiece W also plays a role to machine, for example working fluid feed system 40 and the working groove 5 that impregnated in the working fluid.
[Chemical formula 2]
In the present invention, reduce the segregation of workpiece W reliably through setting gap voltage Vmean, reduce reliably metal ion adhering to workpiece W through in working fluid, adding adenine according to the workpiece material.
For example, well-known, be under the situation of WC-Co superhard alloy at workpiece W, be easy to the segregation of Ionized cobalt (Co) work in-process.Through making gap voltage Vmean deflection antipolarity side, can significantly reduce the segregation of cobalt.
Even at workpiece W is under the situation of iron and steel,, also can significantly reduce the segregation of workpiece material through making gap voltage Vmean deflection antipolarity side.Even the present inventor finds that the gap voltage Vmean of iron and steel parts W is roughly 0V or a little near the positive polarity side, the segregation of material also is in the permissible range.In addition, the present inventor also finds significantly to reduce in gap voltage Vmean work in-process and the non-processing of segregation of iron and steel parts W different.
Save set 52 is made up of hard disk, CD-ROM etc., preserves the NC program of carrying out edm.Workpiece material, ON time ON, deadline, processing conditions such as OFF and servo reference voltage SV was recorded and narrated in the NC program.
Save set 52 is preserved the tables of data of the combinations of parameters that comprises a plurality of decision gap voltage Vmean.Tables of data comprises the width ND of positive polarity voltage pulse and the width RD of reverse voltage pulse at least.Tables of data also comprises output voltage, ON time ON, the deadline OFF and processing conditions such as servo reference voltage SV of workpiece material, power supply.The gap voltage Vmean of segregation that prevents workpiece W is according to the material of workpiece W and difference, according to cooked mode/non-cooked mode and difference.Cooked mode represent workpiece W be in the processing during, non-cooked mode represent workpiece W process finishing but not processing in during.
Treating apparatus 53 is made up of CPU and memory, controls the edm of workpiece W according to NC program, tables of data.Treating apparatus 53 comprises adenine control module 54, processing conditions setting module 55, pulse control module 56 and gap voltage detection module 57.
With reference to Fig. 8, the technology of discharge-treating method of the present invention is described.In step S10, the operator is fixed to workpiece W on the work piece platform 6, makes working groove 5 be full of working fluid.The operator imports best adenine concentration in NC device 50 for the corrosion that prevents workpiece W.Adenine control module 54 is according to the discharge-amount of operator's input setting pump 71, and corrosion inhibitor adding set 70 adds adenine in working fluid.
At step S20, in NC device 50, set cooked mode.In step S21, processing conditions setting module 55 is read the NC program and is set processing conditions.And then processing conditions setting module 55 is set best gap voltage Vmean according to processing conditions that is extracted and tables of data.Particularly, best gap voltage Vmean decides through the width ND of setting positive polarity voltage pulse and the width RD of reverse voltage pulse.In the workpiece material is under the situation of WC-Co superhard alloy or iron and steel, and gap voltage Vmean is set to a side of antipolarity (among Fig. 3-side).
In step S22, pulse control module 56 cut-off switch 25 are controlled the conduction and cut-off switch motion of switching transistor 81,82,83 and 84.Like this, alternating voltage pulses is applied to gap 9 from dc source 21.Gap voltage detection module 57 compares gap voltage Vgap and suitable threshold for the generation that detects discharge.
If in step S23, detect the generation of discharge, then technology enters into step S24 and begins ON time.Pulse control module 56 close switch 25 in step S24 make switching transistor 81,82,83 and 84 end, make switching transistor 12 conductings.Like this, alternating voltage pulses apply end, DC pulse supplies to gap 9 from dc source 11.
In step S25, if ON time ON reaches setting value, then technology enters into step S26 and begin deadline.Pulse control module 56 ends switching transistor 12 in step S26, and the supply of DC pulse finishes.
In step S27, if deadline, OFF reached setting value, then technology enters into step S28.If processing does not finish in step S28, then technology turns back to step S22.Like this, through supplying with the material that DC pulse has been removed workpiece W from dc source 11.
If process finishing in step S28 is then set non-cooked mode in NC device 50 in step S30.In step S31, processing conditions setting module 55 is set the width ND of positive polarity voltage pulse and the width RD of reverse voltage pulse so that gap voltage Vmean becomes the mode of the optimum value of the segregation that prevents workpiece W.In step S32, pulse control module 56 cut-off switch 29 are controlled the conduction and cut-off switch motion of switching transistor 81,82,83 and 84.Like this, alternating voltage pulses is applied to gap 9 from dc source 26, so even in the unmanned running of discharging processing machine, also can prevent the segregation of workpiece W.
If the operator finishes applying of alternating voltage pulses and workpiece W is unloaded then discharge process end from work piece platform 6 in step S33.In step S21 and S31, also can be through replacing pulse width ND and RD sets zero load voltage NV, RV decides gap voltage Vmean.Being preferably, is under the situation of WC-Co superhard alloy in the material of workpiece W, gap voltage Vmean is set at the value of antipolarity side.
With reference to Fig. 9, the 2nd embodiment of discharging processing machine of the present invention is described.Additional same to the key element identical with reference to numbering with the discharging processing machine of Fig. 2, omit their explanations.In wire electric discharge machine, appended the zero load voltage setting circuit 60 of bringing into play function as the gap voltage setting device.Zero load voltage setting circuit 60 is configured between bridge circuit 22 and the gap 9, is connected to supply unit 20 with gap 9 parallelly connectedly.Zero load voltage setting circuit 60 is shunt (shunt) that the electric current from supply unit 20 is passed through.Zero load voltage setting circuit 60 can individually be set the zero load voltage of positive polarity voltage pulse and the zero load voltage of reverse voltage pulse.
Zero load voltage setting circuit 60 comprises: be connected in series the 1st shunt of switch 63, variable resistance 67 and diode 64; Be connected in series the 2nd shunt of switch 65, variable resistance 68 and diode 66; And switch 61.The the 1st and the 2nd is connected to supply unit 20 along separate routes each other concurrently.Diode 64 only makes electric current flow through the 1st along separate routes when gap 9 has been applied the positive polarity voltage pulse.Diode 66 only makes electric current flow through the 2nd along separate routes when gap 9 has been applied the reverse voltage pulse.If switch 61 and 63 breaks off, then zero load voltage NV reduces according to the resistance of variable resistance 67.If switch 61 and 65 breaks off, then zero load voltage RV reduces according to the resistance of variable resistance 68.Switch 61,63 and 65 is by 50 controls of NC device.
The inventor tests wire electric discharge machine of the present invention.The adenine that uses in the experiment is Kohjin Co., Ltd.'s (KOHJIN Co., Ltd.) system.Working fluid maintains that ph is 6.5～7.5, temperature is about 25 ℃, resistivity 5 * 10
4Ω cm～1 * 10
5Ω cm.The concentration of adenine maintains 10mg/L～1000mg/L.Used brazen line electrode.The absolute value of servo reference voltage SV is 10V～50V.
[processing of WC-Co superhard alloy workpiece]
WC-Co superhard alloy workpiece is processed.The cycle of alternating voltage pulses be 20 μ s, ON time ON be 0.25 μ s～0.5 μ s, deadline OFF be 7.5 μ s～8.0 μ s.Being set at 10 μ s and the width ND of positive polarity voltage pulse is reduced to less than 10 μ s through width RD the reverse voltage pulse, gap voltage Vmean is set to-2.5V～-3.5V.Its result, adhering to all of the segregation of workpiece material and metal ion almost disappears.
Through the reduction that replaces pulse width ND the zero load voltage NV of positive polarity voltage pulse is reduced to less than+80V, gap voltage Vmean is set to-below the 2.0V.Its result, being segregated in the permissible range of workpiece material, adhering to almost of metal ion disappears.
[processing of iron and steel parts]
Iron and steel parts is processed.The cycle of alternating voltage pulses be 20 μ s, ON time ON be 0.4 μ s～0.5 μ s, deadline OFF be 7.5 μ s～8.0 μ s.Being set at 10 μ s and the width ND of positive polarity voltage pulse is reduced to less than 10 μ s through width RD the reverse voltage pulse, gap voltage Vmean is set to-1.5V～-2.5V.Its result, adhering to all of the segregation of workpiece material and metal ion almost disappears.
Width ND and RD through with potential pulse are set at 10 μ s, and gap voltage Vmean is set to 0V.Its result, being segregated in the permissible range of workpiece material, adhering to almost of metal ion disappears.
Through zero load voltage RV is changed, gap voltage Vmean is set to greater than 0V smaller or equal to+2.0V.Its result, being segregated in the permissible range of workpiece material, adhering to almost of metal ion disappears.
[in the non-processing]
WC-Co superhard alloy workpiece is placed in the working fluid, applies alternating voltage pulses from 26 pairs of gaps 9 of dc source of 15V.Being set at 32 μ s and the width ND of positive polarity voltage pulse is reduced to less than 32 μ s through width RD the reverse voltage pulse, gap voltage Vmean is set to-2.5V～-3.5V.Its result, adhering to all of the segregation of workpiece material and metal ion almost disappears.
Iron and steel parts is placed in the working fluid, applies alternating voltage pulses from 26 pairs of gaps 9 of dc source of 15V.Being set at 32 μ s and the width ND of positive polarity voltage pulse is reduced to less than 32 μ s through width RD the reverse voltage pulse, gap voltage Vmean is set to-3.5V～-4.5V.Its result, adhering to all of the segregation of workpiece material and metal ion almost disappears.
Width ND and RD through with potential pulse are set at 32 μ s, and gap voltage Vmean is set to 0V.Its result, being segregated in the permissible range of workpiece material, adhering to almost of metal ion disappears.
Being set at 32 μ s and the width ND of reverse voltage pulse is reduced to less than 32 μ s through width RD the positive polarity voltage pulse, gap voltage Vmean is set to+2.5V～+ 3.5V.Its result, being segregated in the permissible range of workpiece material, adhering to almost of metal ion disappears.
Claims (13)
1. an electric discharge device on one side to being formed at the gap supply working fluid between workpiece and the tool-electrode, carries out the edm of said workpiece on one side, it is characterized in that, comprising:
Supply unit; Apply alternating voltage pulses to said gap, said alternating voltage pulses is by being that positive potential and said tool-electrode are that negative potential is the positive polarity voltage pulse that applies of positive polarity and is that negative potential and said tool-electrode are that positive potential is that the reverse voltage pulse that antipolarity applies constitutes with said workpiece with said workpiece;
The gap voltage setting device, the average voltage in setting gap; And
The adenine adding set adds adenine in said working fluid.
2. electric discharge device according to claim 1 is characterized in that,
Said gap voltage setting device is set the average voltage in said gap to a side of said antipolarity.
3. electric discharge device according to claim 1 is characterized in that,
Said gap voltage setting device is set the width of said positive polarity voltage pulse.
4. electric discharge device according to claim 1 is characterized in that,
Said gap voltage setting device is set the width of said reverse voltage pulse.
5. electric discharge device according to claim 1 is characterized in that,
Said gap voltage setting device is set the zero load voltage of said positive polarity voltage pulse.
6. electric discharge device according to claim 5 is characterized in that,
Said gap voltage setting device comprise with said gap be connected to parallelly connectedly said supply unit the 1st along separate routes, the said the 1st comprises along separate routes: only when said gap having been applied said positive polarity voltage pulse, make electric current through the said the 1st along separate routes the 1st diode and the 1st switch that is connected in series with said the 1st diode.
7. electric discharge device according to claim 6 is characterized in that,
The said the 1st comprises the 1st variable resistance that is connected in series with said the 1st diode along separate routes.
8. electric discharge device according to claim 1 is characterized in that,
Said gap voltage setting device is set the zero load voltage of said reverse voltage pulse.
9. electric discharge device according to claim 8 is characterized in that,
Said gap voltage setting device comprise with said gap be connected to parallelly connectedly said supply unit the 2nd along separate routes, the said the 2nd comprises along separate routes: only when said gap having been applied said reverse voltage pulse, make electric current through the said the 2nd along separate routes the 2nd diode and the 2nd switch that is connected in series with said the 2nd diode.
10. electric discharge device according to claim 9 is characterized in that,
The said the 2nd comprises the 2nd variable resistance that is connected in series with said the 2nd diode along separate routes.
11. electric discharge device according to claim 1 is characterized in that,
Said gap voltage setting device is set the average voltage in said gap according to the material of said workpiece.
12. a discharge-treating method, on one side working fluid is supplied with in the gap that is formed between workpiece and the tool-electrode, carry out the edm of said workpiece on one side, it is characterized in that, comprising:
Is that negative potential and said tool-electrode are the step that a side of the antipolarity of positive potential is set with the average voltage in said gap to said workpiece; And
In said working fluid, add the step of adenine.
13. discharge-treating method according to claim 12 is characterized in that,
The average voltage in said gap is to set according to the material of said workpiece.
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| US20140224859A1 (en) * | 2012-02-29 | 2014-08-14 | Sumitomo Electric Industries, Ltd. | Coated rotary tool and method for manufacturing the same |
| CN105081485A (en) * | 2015-09-28 | 2015-11-25 | 河南省大地合金股份有限公司 | Carbon tungsten alloy fine bar for electrical discharge machining |
| TWI671151B (en) * | 2017-12-01 | 2019-09-11 | 財團法人金屬工業研究發展中心 | Electrochemical grinding device and conductive grinding wheel thereof |
| WO2024224562A1 (en) * | 2023-04-27 | 2024-10-31 | ファナック株式会社 | Control device, electrodischarge machining apparatus, and control method |
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| WO2006126248A1 (en) * | 2005-05-23 | 2006-11-30 | Mitsubishi Denki Kabushiki Kaisha | Machining liquid quality control apparatus, method therefor, and electro-discharge machining apparatus |
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| JPS61274812A (en) * | 1985-05-30 | 1986-12-05 | Fanuc Ltd | Rust preventive machining method of machined surface in electric discharge machining under water |
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| WO2006126248A1 (en) * | 2005-05-23 | 2006-11-30 | Mitsubishi Denki Kabushiki Kaisha | Machining liquid quality control apparatus, method therefor, and electro-discharge machining apparatus |
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