CN102085587B - AC-power-fed wire electric discharge machine - Google Patents
AC-power-fed wire electric discharge machine Download PDFInfo
- Publication number
- CN102085587B CN102085587B CN2010106244923A CN201010624492A CN102085587B CN 102085587 B CN102085587 B CN 102085587B CN 2010106244923 A CN2010106244923 A CN 2010106244923A CN 201010624492 A CN201010624492 A CN 201010624492A CN 102085587 B CN102085587 B CN 102085587B
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- power supply
- circuit
- electric discharge
- discharge machine
- wire electric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/04—Apparatus for supplying current to working gap; Electric circuits specially adapted therefor
-
- 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
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/14—Electric circuits specially adapted therefor, e.g. power supply
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention relates to an AC-power-fed wire electric discharge machine which can prevent decrease of voltage and improve surface quality and processing precision of workpieces without losing input power energy. The AC-power-fed wire electric discharge machine comprises a power supply portion providing DC power, a converting portion which generates resonance in a resonance circuit according to the prescribed resonant frequency, the resonance circuit which is a serial or parallel circuit for using conductors and capacitors and outputs minimal discharge current under the prescribed resonant frequency, and a magnifying circuit which magnifies the power supply according to predetermined range. DC power fed by the power supply portion is converted into AC power through a conversion circuit, aresonance circuit and a magnifying circuit and the AC power is supplied to the discharge electrodes.
Description
Technical field
The present invention relates to wire electric discharge machine; Being particularly related to the voltage that can prevent in the wire electric discharge machine descends; And can be in the energy that does not lose the input power supply; What make that surface quality and the machining accuracy of processed goods improve exchanges (Alternating Current is to call " AC " in the following text) power supply supply type wire electric discharge machine.
Background technology
Generally; So-called discharging processing machine is meant that the electro ultrafiltration that is utilized in generation when producing discharge between two sparking electrodes comes the device that object is processed, and comprises using the moulding discharging processing machine and the polytypes such as wire electric discharge machine that use line as sparking electrode of shaped electrode as sparking electrode.
On the other hand; Like above-mentioned discharging processing machine; The process velocity of object and the roughness of machined surface are different because of the size that is applied to the discharge power supply between the sparking electrode, therefore must possess the discharge power supply control device that can carry out accurate control to the size that is applied to the discharge power supply between the above-mentioned sparking electrode.
In the wire electric discharge machine in discharging processing machine; In order to improve dimensional accuracy and surface roughness, usually even will implement four processing, and for the processing characteristics of current discharging processing machine; Time processing is equivalent to roughing; Surface roughness Ra (surface roughness) is about 3 μ m, and secondary operations is middle processing, and surface roughness is Ra 2 μ m.Three, four processing is equivalent to fine finishining, adds the surface roughness in man-hour three times to be about Ra 1 μ m, adds the surface roughness in man-hour and is about Ra 0.7 μ m for four times.
As stated, shown in Figure 1 is to add man-hour four times, makes surface roughness be machined to the structure of the wire electric discharge machine of about Ra 0.7 μ m.
With reference to Fig. 1, variable resistor 100 is connected in parallel, make resistance value variable, through regulating the processing electric current that flows through between the sparking electrode, it is conformed to required finished surface rugosity.At this moment, the processing electric current that flows through is more little, and the finished surface rugosity is good more, therefore makes the resistance value of variable resistor 100 big more, and the processing electric current that flows through between sparking electrode is more little, thereby can improve the finished surface rugosity.
Yet, if resistance is increased to more than the certain value, being applied to the voltage decreases between the sparking electrode, therefore the problem that appearance is not discharged can not diminish electric current through unlimited increase resistance.
Therefore, if the voltage across poles that causes of compensate for variable resistance descend and make and apply voltage (V) and raise, then processing electric current increases, and causes finished surface rugosity variation.Therefore, the result who finds the adequate value that applies voltage (V) and variable resistance to implement is about about 100 Ω, applies under the situation that voltage is 80V in the maximum of current-limiting resistance, and the electric current that flows through between sparking electrode is about 0.8A.
As stated, be about at the electric current that flows through between sparking electrode under the situation of 0.8A, surface roughness is for being Ra 0.7 μ m to the maximum.
As shown in Figure 1, the sense of current that flows through between sparking electrode is processing object thing 103 to line 104 directions or line 104 to processing object thing 103 directions,, the mode that flows to a direction is called direct current (DC, DirectCurrent) power supply supply mode that is.
Yet, make four finished surface rugosity be less than the circuit below the value Ra 0.3 μ m of Ra 0.7 μ m along with developing the technology that improves surface roughness gradually, also having developed.
Shown in Figure 2 is the wire electric discharge machine below the Ra 0.3 μ m for making the finished surface rugosity.
With reference to Fig. 2, between sparking electrode, remove variable-resistance structure, inserted ring core inductance 200.In addition, use MOSFET (Tr) is as dc-input power and be converted to 1MHz, is 0.5 μ s with the unlatching that is applied to the power supply between the sparking electrode (ON) time restriction.
Limited the magnitude of current that flows through between sparking electrode thus, and changed supply voltage (V) value, made processing electric current produce multiple variation, can process multiple thickness of material thus, made four finished surface rugosity reach R
Max0.8～2.5 μ m (being about Ra 0.2～0.3 μ m when being converted into Ra).
Yet as shown in Figure 2, under the situation of using ring core 200, the energy that exists the input power supply has only used about 10% in reality processing, and all the other energy of 90% become the problem that thermal loss falls in ring core 200.Therefore, in order to cool off the heat of ring core 200, can only ring core be made into water-cooled structure.
Summary of the invention
Therefore; The present invention proposes in order to solve aforesaid problem; Purpose is to provide a kind of can prevent that the voltage in the wire electric discharge machine from descending; And can in the energy that does not lose the input power supply, make the surface quality of processed goods and the wire electric discharge machine that machining accuracy is improved.
For this reason, wire electric discharge machine of the present invention is characterised in that this wire electric discharge machine comprises: power supply unit 330, and it supplies with direct current (DC) power supply; Change-over circuit 320, it is connected with said power supply unit 330, changes, and makes that in resonance circuit 310 resonant frequency produces resonance according to the rules; Resonance circuit 310, it is connected with said change-over circuit 320, and constitutes series connection or the series-parallel circuit that uses inductance and electric capacity, and under said regulation resonant frequency, exports minimum discharge current; And amplifying circuit 300; It is connected with said resonance circuit 310; The big or small multiplying gauge tentering degree of said interchange (AC) power supply offered be used for sparking electrode 341,351 that processing object thing 340 is processed, use said change-over circuit 320, resonance circuit 310 and amplifying circuit 300; To convert interchange (AC) power supply to from direct current (DC) power supply that said power supply unit is supplied with offers between the sparking electrode 341,351.
In addition, an example in according to the present invention is characterized in that, said change-over circuit 320 is created on the resonant frequency of using in the said resonance circuit 310 through conversion.
In addition, an example in according to the present invention is characterized in that said power supply unit 330 constitutes variable power supply, and can select apply voltage according to the kind and the thickness of processing object thing 340.
As stated; In the wire electric discharge machine among the present invention; In order to improve the surface roughness of processing object thing; Possess the resonant mode amplifying circuit that produce to exchange high frequency, do not use electric resistance structure, therefore can solve the problem that voltage that the resistance that produces in the wire electric discharge machine in the past causes descends like prior art.
In addition, for noenergy loss ground, farthest to sparking electrode transmission processing electric current, can carry out changing, thereby can solve the energy loss problem of as prior art, using ring core to cause to the regulation resonant frequency.
In addition, can in prescribed limit, select to apply magnitude of voltage, can generate suitable processing conditions according to kind and thickness thus, therefore have the advantage of the surface roughness that can reach required size as the material of processing object thing.
Description of drawings
Fig. 1 and shown in Figure 2 be the structure chart of wire electric discharge machine of the prior art.
Structure chart for interchange (AC) the power supply supply type wire electric discharge machine among the present invention shown in Figure 3.
The measurement result figure of the finished surface rugosity that processes for interchange (AC) the power supply supply type wire electric discharge machine among the present invention shown in Figure 4.
Label declaration
300: amplifying circuit 310: resonance circuit
320: change-over circuit 330: power supply unit
340: processing object thing 350: line
341,351: sparking electrode
The specific embodiment
Following with reference to accompanying drawing, the wire electric discharge machine in the preferred embodiment among the present invention is elaborated.
Realized interchange (AC) power supply supply type wire electric discharge machine among the present invention; Its one being sidelong electrode and being connected with the processing object thing in a plurality of sparking electrodes; The opposite side sparking electrode is made up of line; Wherein, the sense of current that flows through between sparking electrode alternately converts direction and the direction from line to the processing object thing from the processing object thing to line into.
Shown in Figure 3 is the structure chart of interchange (AC) the power supply supply type wire electric discharge machine in the embodiment of the invention.With reference to Fig. 3; Exchange (AC) power supply supply type wire electric discharge machine and comprise power supply unit 330, change-over circuit 320, resonance circuit 310 and amplifying circuit 300; Be sidelong on the electrode 351 at one of which and connect wiredly 351, on opposite side sparking electrode 341, be connected with processing object thing 340 to be processed.
Change-over circuit 320 is connected with power supply unit 330, changes, and makes that in resonance circuit 310 resonant frequency produces resonance according to the rules.At this moment, in embodiments of the present invention, the size of resonant frequency is set in and can be got final product by the degree of the minimum discharge current of resonance circuit 310 outputs, its optimal value can be set to 1MHz.
Amplifying circuit 300 is connected with said resonance circuit 310, the big or small multiplying gauge tentering degree of said interchange (AC) power supply is supplied to be used for sparking electrode 341,351 that processing object thing 340 is processed.
Use said change-over circuit 320, resonance circuit 310 and amplifying circuit 300, will convert interchange (AC) power supply to from direct current (DC) power supply that said power supply unit 330 is supplied with, and be supplied between the said sparking electrode 341,351.Thus, the electric current between the sparking electrode 341,351 replaces from the mode that line 351 is supplied to processing object thing 340 to be supplied to line 351 backs from processing object thing 340 earlier, thereby supplies with to exchange (AC) power supply supply mode.
As stated,, then can significantly shorten the needed processing that recovers to insulate and close (OFF) time, therefore can utilize high frequency electric source to process if will exchange (AC) power supply supplies between the sparking electrode 341,351.
To processing electric current that sparking electrode 341,351 applies and the roughly functional relation between the resonant frequency, shown in following < mathematical expression 1 >.
[mathematical expression 1]
Resonant frequency
Owing to do not use variable resistor structure among the present invention, so resistance (R) value is 0, and electric current is by inductance L, capacitor C and apply voltage V and determine.According to following mode design circuit: use the series connection or the series parallel resonance circuit 310 that are made up of inductance L and capacitor C, under the resonant frequency of regulation, making maximum current is that the following weak processing electric current of 1A is passed to sparking electrode 220,230.At this moment, resonant frequency uses processing electric current to be the resonant frequency below the 1A.
Because wire electric discharge machine of the present invention does not use resistance, therefore can solve the problem that descends because of the voltage across poles that uses resistance to produce in the prior art.
In addition, in wire electric discharge machine of the present invention, because inductance L and the capacitor C value of resonance circuit 310 fix, so the processing electric current value is determined by the voltage V that applies of power supply unit 330.
In addition, lose ground, farthest transmit processing electric current for noenergy among the present invention, it is particularly important to convert resonant frequency into, preferably, converts the resonant frequency of 1Mhz into.However, the size of resonant frequency is not limited to 1Mhz, can produce through design and make the resonant frequency of processing electric current value below 1A.
As stated, improve the efficiency of traditional wire discharging processing machine among the present invention, solved energy loss problem in the past.In addition, aforesaid resonant frequency is reached under the situation of 1Mhz, consumes electric power is about 50W, can realize making the surface roughness (Ra) of processing object thing 340 to reach four finished surface rugosity of 0.2～0.3 μ m.
Wire electric discharge machine need be processed material different kind and thickness, and the wire electric discharge machine among the present invention has made up two kinds of components for this reason, can realize kind and the corresponding processing conditions of thickness with material.
That is, can be according to the kind and the thickness of processing object thing 340, adjusting is processed from voltage (V) value that applies that power supply unit 330 applies.
For example, applying magnitude of voltage shown in following <table 1 >, can be that unit is set at 16 ranks with 10V in the scope of 50～200V voltage.
[table 1]
| Rank | Magnitude of voltage | Rank | Magnitude of voltage |
| 1 | 50V | 9 | 130V |
| 2 | 60V | 10 | 140V |
| 3 | 70V | 11 | 150V |
| 4 | 80V | 12 | |
| 5 | 90V | 13 | 170V |
| 6 | 100V | 14 | 180V |
| 7 | 110V | 15 | 190V |
| 8 | 120V | 16 | 200V |
That is, can use a level in 16 ranks that define in above-mentioned <table 1>else to apply power supply according to the kind and the thickness of processing object thing to be processed.
Thick (once) processing with in (secondary) i.e. three processing beginnings of fine finishining after machining, can use the wire electric discharge machine in the embodiment of the invention to process.
Because according to the thickness of processing object thing, the process velocity of employing is different, therefore can apply voltage and carry out three processing according to the thickness change, realize processing based on different materials kind and thickness.
For example, under the situation of 40mm steel (steel) material, add for three times and to apply 100V voltage man-hour, add for four times and to apply 50V voltage man-hour and process, it is the surface roughness below the Ra 0.3 μ m that its result can obtain processing object thing surface roughness.
In the wire electric discharge machine in the invention described above embodiment,, increased generation and exchanged the resonant mode amplifying circuit of high frequency waves, thereby surface roughness is reached below the Ra 0.3 μ m in order to improve surface roughness.
More than the specific embodiment among the present invention is specified.Yet technological thought of the present invention and scope are not limited to above-mentioned specific embodiment, and the technical staff with the affiliated technical field general knowledge of the present invention should be appreciated that in the scope that does not change purport of the present invention, the present invention can have multiple modification and modification.
Therefore; Should be appreciated that; The foregoing description that is provided is used for that the technical staff of technical field general knowledge intactly explains category of the present invention under the present invention to having, and is not to point out from whole aspects and limit, and the present invention is only by the category definition of claim.
Claims (3)
1. an AC power supply type wire electric discharge machine is characterized in that,
This wire electric discharge machine comprises:
Power supply unit (330), it supplies with direct current (DC) power supply;
Change-over circuit (320), it is connected with said power supply unit (330), is used to change, and makes that in resonance circuit (310) resonant frequency produces resonance according to the rules;
Resonance circuit (310), it is connected with said change-over circuit (320), and constitutes series connection or the series-parallel circuit that uses inductance and electric capacity, and under said regulation resonant frequency, exports minimum discharge current; And
Amplifying circuit (300), it is connected with said resonance circuit (310), with the big or small multiplying gauge tentering degree of said power supply,
Use said change-over circuit (320), resonance circuit (310) and amplifying circuit (300), will convert interchange (AC) power supply to from direct current (DC) power supply that said power supply unit (330) is supplied with and offer between the sparking electrode (341,351).
2. according to the AC power supply type wire electric discharge machine of claim 1, it is characterized in that said change-over circuit (320) is created on the resonant frequency of using in the said resonance circuit (310) through conversion.
3. according to the AC power supply type wire electric discharge machine of claim 1, it is characterized in that said power supply unit (330) constitutes variable power supply, and can select to apply voltage according to the kind and the thickness of processing object thing (340).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2009-0121155 | 2009-12-08 | ||
| KR1020090121155A KR20110064502A (en) | 2009-12-08 | 2009-12-08 | Wire electric discharge machine of alternating current power source providing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102085587A CN102085587A (en) | 2011-06-08 |
| CN102085587B true CN102085587B (en) | 2012-06-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010106244923A Expired - Fee Related CN102085587B (en) | 2009-12-08 | 2010-12-06 | AC-power-fed wire electric discharge machine |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20110064502A (en) |
| CN (1) | CN102085587B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7171597B2 (en) * | 2017-10-25 | 2022-11-15 | 株式会社ワコム | Position indicator, position indicator device, and method for detecting tilt of position indicator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1857839A (en) * | 2005-05-06 | 2006-11-08 | 阿奇公司 | Method and apparatus for generating machining pulses for electrical discharge machining |
| CN201192748Y (en) * | 2008-05-13 | 2009-02-11 | 上海通用控制自动化有限公司 | Processing electric power circuit for low-speed one way wire cutting and processing machine tool |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61197125A (en) * | 1985-02-27 | 1986-09-01 | Inoue Japax Res Inc | Wire cut electric discharge machine |
| JP3361057B2 (en) * | 1998-06-10 | 2003-01-07 | 株式会社ソディック | Electric discharge machining method and power supply device for electric discharge machining |
-
2009
- 2009-12-08 KR KR1020090121155A patent/KR20110064502A/en not_active Application Discontinuation
-
2010
- 2010-12-06 CN CN2010106244923A patent/CN102085587B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1857839A (en) * | 2005-05-06 | 2006-11-08 | 阿奇公司 | Method and apparatus for generating machining pulses for electrical discharge machining |
| CN201192748Y (en) * | 2008-05-13 | 2009-02-11 | 上海通用控制自动化有限公司 | Processing electric power circuit for low-speed one way wire cutting and processing machine tool |
Non-Patent Citations (2)
| Title |
|---|
| JP昭61-197125A 1986.09.01 |
| JP特开平11-347844A 1999.12.21 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102085587A (en) | 2011-06-08 |
| KR20110064502A (en) | 2011-06-15 |
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Effective date of registration: 20160713 Address after: Gyeongnam, South Korea Patentee after: DOOSAN MACHINE TOOL CO., LTD. Address before: Inchon, South Korea Patentee before: Doosan Infracore Co., Ltd. |
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Granted publication date: 20120627 Termination date: 20161206 |
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