CN85104690A - The galvano-cautery processing method and the equipment of workpiece - Google Patents
The galvano-cautery processing method and the equipment of workpiece Download PDFInfo
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- CN85104690A CN85104690A CN85104690.8A CN85104690A CN85104690A CN 85104690 A CN85104690 A CN 85104690A CN 85104690 A CN85104690 A CN 85104690A CN 85104690 A CN85104690 A CN 85104690A
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Abstract
Workpiece is carried out the method and apparatus that electricity soaks corrosion processing, utilize in the tool-electrode (voltage of executing is pulse group form) by imposing pulse-shaped dc voltage between workpiece and the electrode, the pulse group is by being made up of the current impulse of different amplitudes.It is better that each current impulse that belongs to a pulse group has the amplitude of rising.Be equipped with several be parallel to workpiece and (or) the separately controllable power switch circuit of tool-electrode.The primary side that belongs to the pulse transformer of each power switch circuit is connected with a device is shaped the pulse group chronologically.Have at least a gauge tap that belongs to each power switch circuit to be connected, to form the current impulse wave amplitude with one second device.
Description
The present invention is about the preface by patent requirement 1 and 7, the method and apparatus of electricity consumption corrosion processing workpiece.
The galvano-cautery processing method, especially galvano-cautery cutting method is according to empirical data and supposition to a great extent, because, so far to none physics of the determining description still of the discharge process in the working clearance.Therefore, with regard to the cutting process that uses line electrode or strip electrode, except that gravity, owing to electromagnetism, static, and machinery or hydraulic action and the vibration that causes also can throw into question.Because this vibration, and the fine finishining condition of major requirement require therefore very high to the impulse generator that uses; The discharge time of this fine finishining conditional request is extremely short, that is to say in the microsecond scope, and frequency range is about 100～500KHz.Though discharge time is short, this impulse generator must can provide about 200 amperes electric current.At present, the control of the time of discharge process is to be undertaken by opening or closing of clamp-pulse generator basically.
In order to keep the galvano-cautery process with interference-free best, known impulse generator (for example according to Germany 2,908,696 or 2,909, No. 073 patent) can occur interrupting discharge process when process exception or wear to electrodes surpass a limiting value immediately.In order to control the distribution of discharge energy, the pulse that each operating circuit sends that superposes of the additional time shift of known utilization can obtain shaped pulse, for example the 495th, No. 812 patent of Switzerland.Yet this impulse generator only is fit to long pulse.
Problem of the present invention is, further develops existing method and apparatus with regard to the adjustability of the optional impulse waveform of relevant discharge current.According to the present invention, this problem is to require 1 and 7 subject content to solve with patent.
The present invention also provides possibility for setting the short pulse waveform that requires.In addition, the present invention is bigger, and advantage is, by distributing the required energy of each discharge, rate of corrosion or corrosive power is improved, and improves cutting speed greatly in back to back whole discharges.In addition, the effect of the power on electrode also is improved, so can more effectively carry out process control.In addition, though the corrosive power height, thereby cutting rate is also high, can also make processing work keep very consistent surface quality, also can control corrosion process at an easy rate.
Hereinafter, will do more detailed elaboration to the present invention at infinite concrete equipment and with reference to accompanying drawing, wherein:
The square frame diagram of Fig. 1, the impulse generator of setting forth by the mode of giving an example.
Fig. 2 a to seven is the schematic time waveform figure according to the pulse train on the impulse generator of Fig. 1.
Fig. 3, another pulse train similar with the pulse train of Fig. 2 c.
The oscillogram of Fig. 4, certain preferred concrete device.
The detailed description of preferred concrete device
According to Fig. 1, the working clearance 103 cuts out on workpiece 101 by means of line electrode 102.Line electrode 102 is leading between line electrode leading truck 104a and the last line electrode leading truck 104b down.The figure of cutting curve is to use the indication shape of XY coordinator to control, or controls with other method, but preferably controls with NC.
The positive pole of impulse generator+be connected with a tie point 105 of workpiece 101, and in the contiguous place of upper and lower line electrode leading truck 104a, 104b, negative pole-be introduced on the line electrode.
Impulse generator comprises baseline current-source 1, voltage source 2 and pulse transformer 11, and control signal 3 is connected to the primary side 11a of transformer, and secondary end 11b, the 11c of transformer then are connected with electronic switch, for example switching transistor 12 or 15, and diode 13.Impulse generator utilizes a current-limiting resistance 14 to be connected in wire electrode 102.
The base-emitter that provides a DC voltage (for example 5V) of clearly determining to put on switching transistor 12 by voltage source 2 is tied then, and the base-emitter knot of switching transistor 12 is closed.If with the existing primary side 11a that comprises control signal 3 pulse transformer 11 of a pulse train, just in two secondary windings 11b of pulse transformer 11 and 11c, can produce corresponding secondary control voltage.Because the control voltage on the secondary windings 11b, switching transistor 12 is opened, and the control voltage that produces on second secondary windings 11c causes the quick conducting of the switching transistor 12 of a cross-over connection diode 13.
In physical device, several this power switch circuits (for example a to n) be in parallel and all by described form hereinafter with control signal corresponding 3 controls, this power switch circuit comprises pulse transformer 11, controlled switch.(being switching transistor 12 and 15 in this case), baseline current-source 1, voltage source 2 and diode 13.
In order to control above-mentioned power switch circuit, high-frequency clock pulse generator 20 has for example pulsed fundamental clock cycle of 5MHz pulse recurrence frequency to one, by a clock circuit f
0Be added on the pulse calculation element 21.For example, this pulse train is shown in Fig. 2 a.Pulse calculation element 21 can constitute a counting circuit basically, at control signal circuit f
1And f
2On the influence of control signal under, an available clock pulses number of clearly determining, just such shown in Fig. 2 b, as later shaping pulse, particularly according to the basis of time diagram.In view of the above, at control signal wire f
1On switch (ON-OFF) period T determined of control signal, open in (ON), press the fundamental frequency arrival clock line F of Fig. 2 a
0Pulse, can do further shaping by time diagram.Follow by interval T, close (OFF), its duration is circuit f
2On control signal decision.At one-period T, when opening (ON) and finishing, pulse calculation element 21 is to impulse waveform memory 24(electrically programable ROM for example) send a synchronous control signal SO.This synchronizing signal stops memory and triggers the time pulse shaping program conversion of a special storage, with the formation time mould.
Stored this program of some in the impulse waveform memory 24.This program is by means of selecting control signal m selected, and this signal is sent by control that is connected in device or servo-drive system (not shown).Pulse calculation element 21 is connected with S2 with control line S1 by selected impulse waveform.Fig. 2 c demonstrates an example of this shaping pulse time mould.Under existing conditions, the fixed time interval of S1=3 is used to form individual pulse, and the fixed time interval of S2=1 is used to form the pulse spacing.Resulting time shaped pulse signal is received on the amplifying device 23 by the output line 22 of pulse calculation element 21.
Concerning do further shaping pulse according to wave amplitude, the various moulds that pulse group wave amplitude configuration is used are stored in the impulse waveform memory 24.Better way is, these wave amplitude moulds are combined with time mould in the impulse waveform memory 24, and they just can have been changed with identical control signal m like this.In other words after resetting, because the effect of control signal So, the electric current wave amplitude that impulse waveform memory 24 can be on the output line 25 provides a wave amplitude figure, and wave amplitude figure is that the function as the time pulse reshaping signal on circuit S1 and the S2 occurs.This wave amplitude figure is exaggerated and is sent to second electronic switch 15 of the power switch circuit of location in parallel in amplifier 26.These many power switch circuit (a ... n) controlled, the summation of the pulse current that therefore draws be consistent with regard to the desired wave amplitude mould of its wave amplitude.Fig. 2 d is an example of this electric current wave amplitude mould, and wherein second pulse is two times of first pulse amplitude, and the 3rd pulse is four times of first pulse amplitude.
In addition, the selection that participates in the parallel connection power supply on-off circuit of shaping pulse preferably can be undertaken by the corresponding control by means of circuit 25, make aspect arrangement, open the uniform distribution on whole existing power supply on-off circuits as far as possible of (ON) phase place.This will make each used power switch circuit that consistent thermic load is arranged.Therefore, the selection of sort circuit quantity is preferably fixed by coming greater than the mode that produces the required maximum quantity of pulse.
Different with the example of Fig. 2 c, as shown in Figure 3, each pulse that belongs to pulse train also can have different width.The interval that belongs between each pulse of a sequence also can be different.Generally speaking as long as it is beneficial to the cutting characteristic that requires, the interval T between each pulse group is closed (OFF) and be can be used as the function that requires to use to change.
Fig. 4 a shows a voltage oscillogram, and Fig. 4 b shows the once current waveform figure of discharge, according to Fig. 1, includes four different pulses in each case on the working clearance 103.According to shown in example (being used to cut steel), current pulse sequence comprises roughly triangular in shape, the individual pulse that wave amplitude rises, the interval between them is roughly the same.According to Fig. 2 a, voltage gradient is represented the voltage curve of several stacks, the discharge process of promptly relevant several successive.To first pulse, there is a certain zero load frequency, it no longer occurs when second and the 3rd pulse.This just shows that the main pulse of not all continuous discharge all is bound to trigger igniting.In fact, zero load signal can not appear again in each pulse afterwards, so the usefulness of discharge obviously is very big.All discharges all occur in the discharge channel.Therefore, new ionization starting does not need high ignition voltage.
Actual tests proves that this pulse train can obviously improve corrosion rate.This can illustrate with the following fact, even first initial pulse can not trigger discharge, also can line electrode be placed on the good locations of working clearance center because of the effect of the electromagnetic force that discharges from it.Therefore can form later discharge especially effectively.Once each subpulse of discharge triggers once the part, and the very corrosion of Ji Zhonging still, because its current strength improves repulsive force is increased, and this force reaction is in the mass force of line electrode.In the pulse spacing (electric current needn't drop to zero), above-mentioned repulsive force temporarily reduces, so guide line electrode more accurately.In addition, in the pulse spacing, electric current reduce to reduce pressure in the discharge path, this helps the eliminating of ablation material.The pulse of postorder is the clean material surface of energy striking just, and it is uniform with regard to power on condition.At last, owing to improved various conditions and strengthened current strength, thereby can realize the corrosion that is entirely satisfactory, even if also be like this on bigger surface distance.
Claims (12)
1, by between workpiece and electrode, imposing the impulse type DC voltage workpiece is carried out the galvano-cautery method for processing by tool-electrode, the continuous path control between workpiece and electrode of the cutting curve unanimity that wherein has and require, the voltage that is applied is pulse group form, wherein each group pulse triggers the single step of releasing electric process in the working clearance between workpiece and electrode, constitutes and the pulse group is a individual pulse by the electric current wave amplitude with different values.
2, according to the method for claim 1, its time-waveform patterns of shaped pulse group obtains from clock pulse sequence, by the controlled parallel connection to several power switch circuits, these phases of wave superpose mutually, to provide desired amplitude pattern.
3, according to the method for claim 2, the parallel control loop that is used for shaping pulse in the method is selected in such a way, that is, with the displacement relationship consistency, all phase places are distributed on all used power switch circuits as far as possible equably.Possible uniform distribution.
4, according to the method for patent requirement 3, the quantity of the power switch circuit of its setting is greater than the required maximum quantity of generation-pulse pattern.
5,, in this method, be by all single current pulse shapings with rising amplitude according to being one method in the aforesaid right requirement at least.
6, basis is one method in the aforesaid right requirement at least, in this method, is made up of all different pulse of width.
7, by between workpiece and electrode, imposing the impulse type DC voltage workpiece is carried out the galvano-cautery method for processing; Wherein have consistent with the cutting curve that requires, continuous path control between workpiece and electrode, the voltage that is applied is pulse group form, wherein each group pulse triggers the single step of releasing electric process in the working clearance between workpiece and electrode, particularly in order to implement the method for claim 1, the independent control power switch circuit that much is connected in parallel on work and/or the tool-electrode can be provided in discharge process, the primary side that wherein belongs to each pulse transformer of each power switch circuit can be connected with one first device, being used for the time shaping of pulse group uses, and have at least a controlled switch that belongs to each power switch circuit also can connect one second device, to form the current impulse wave amplitude, first and second devices all have the impulse waveform memory.
8, require 7 equipment according to patent, in the design of pulse transformer in this equipment it can be moved in the unsaturation scope, switch then uses as the short switch of two secondary windings of pulse transformer.
9, require 8 equipment according to patent, in this equipment, the secondary windings of pulse transformer is by the direction series connection identical with direction of winding, when series connection, one second gauge tap is through control voltage source and a diode and first switch in parallel, and the control input of second switch is connected with the centre cap of pulse transformer secondary windings.
10, require 9 equipment according to patent, in this equipment, the connected mode of second switch is: when time that cut-out offers the elementary winding of pulse transformer during shaped signal, it directly changes not on-state over to.
11, according at least one equipment in the patent requirement 7～10, in this equipment, the impulse waveform memory is to design for receiving several different electric current wave amplitude moulds, and can control the usefulness of the transmission of making these moulds and be used for by control circuit power switch circuit being done mould shape and control.
12, according to the equipment of claim 11, in this equipment, the design of impulse waveform memory is for receiving the time waveform mould relevant with electric current wave amplitude mould to form the pulse group, and these time waveform moulds are offered the pulse calculation element, and the pulse calculation element is connected with the primary side of pulse transformer at output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85104690 CN1017691B (en) | 1985-06-19 | 1985-06-19 | Method and apparatus for electroerosive working of workpieces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85104690 CN1017691B (en) | 1985-06-19 | 1985-06-19 | Method and apparatus for electroerosive working of workpieces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104690A true CN85104690A (en) | 1986-12-24 |
| CN1017691B CN1017691B (en) | 1992-08-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85104690 Expired CN1017691B (en) | 1985-06-19 | 1985-06-19 | Method and apparatus for electroerosive working of workpieces |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017691B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6930273B2 (en) | 2001-01-23 | 2005-08-16 | Mitsubishi Denki Kabushiki Kaisha | Power supply unit for wire electrical discharge machining and method of wire electrical discharge machining |
| CN104708131A (en) * | 2013-12-13 | 2015-06-17 | 通用电气公司 | Machining device and machining method |
| CN105364240A (en) * | 2014-08-12 | 2016-03-02 | 发那科株式会社 | Wire electric discharge machine capable of starting machining from short-circuit state |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4921482B2 (en) * | 2006-10-24 | 2012-04-25 | 三菱電機株式会社 | Wire electrical discharge machine |
-
1985
- 1985-06-19 CN CN 85104690 patent/CN1017691B/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6930273B2 (en) | 2001-01-23 | 2005-08-16 | Mitsubishi Denki Kabushiki Kaisha | Power supply unit for wire electrical discharge machining and method of wire electrical discharge machining |
| CN104708131A (en) * | 2013-12-13 | 2015-06-17 | 通用电气公司 | Machining device and machining method |
| CN104708131B (en) * | 2013-12-13 | 2018-06-29 | 通用电气公司 | Processing unit (plant) and processing method |
| CN105364240A (en) * | 2014-08-12 | 2016-03-02 | 发那科株式会社 | Wire electric discharge machine capable of starting machining from short-circuit state |
| CN105364240B (en) * | 2014-08-12 | 2019-04-26 | 发那科株式会社 | The wire electric discharge machine that can be processed since under short-circuit condition |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1017691B (en) | 1992-08-05 |
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