CN102114559B

CN102114559B - Alternating polarity pulsed power supply

Info

Publication number: CN102114559B
Application number: CN2010100337426A
Authority: CN
Inventors: 张宝华; 梁洪艳
Original assignee: BEIJING ADSPARK DIGITAL EQUIPMENT Co Ltd
Current assignee: Beijing Novick Digital Equipment Co., Ltd.
Priority date: 2010-01-05
Filing date: 2010-01-05
Publication date: 2012-06-06
Anticipated expiration: 2030-01-05
Also published as: CN102114559A

Abstract

The invention discloses an alternating polarity pulsed power supply used for manufacturing a numerical control electric processing machine tool. The alternating polarity pulsed power supply comprises a main oscillation circuit, a driving circuit, a power circuit, a detection circuit and a feedback circuit, wherein, the main oscillation circuit is used for generating reference discharge pulse signals; the driving circuit is used for receiving and amplifiying the reference pulse signals, and outputing first driving signals and second driving signals; the power circuit is used for providing a pilot breakdown detection voltage and a discharge machining voltage of the finish machining process to the discharge clearance of a wire electrode and a manufacturing workpiece according to the first driving signals during the rough machining process, and providing the high-voltage high-current spark discharge energy to the discharge clearance according to the second driving signals; the detection circuit is used for monitoring the discharge condition of the discharge machining clearance on line and in real time during the rough machining process and the finish machining process, and generating machining detection signals; and the feedback circuit is used for generating feedback signals according to the machining detection signals. The alternating polarity pulsed power supply is suitable for an electric spark linear cutting machine and an electric spark forming machine tool, especially a one-way wire linear cutting machine.

Description

A kind of alternating polarity pulse power

Technical field

The present invention relates to the numerical control electrical process machine, relate in particular to the alternating polarity pulse power on the numerical control electrical process machine.

Background technology

Fig. 1 is the pulse power structural representation of numerical control unidirectional wire cutting off machine in the prior art.As shown in Figure 1; The pulse power of traditional unidirectional wire cutting machine is high-power metallic oxide semiconductor (MOS) the pipe power supply that unipolarity does not have current-limiting resistance; Just be the positive polarity of high-frequency impulse discharge power supply on the processing work, wire electrode is the negative polarity of high-frequency impulse discharge power supply.High-voltage breakdown machining medium between two polarity loses except that processing work and produce spark discharge.The machining medium of unidirectional wire cutting machine adopts pure water.Workpiece is that positive polarity, wire electrode are the processing mode of negative polarity, is defined as negative polarity processing; And workpiece be negative polarity, wire electrode is the processing mode of positive polarity, is defined as positive polarity processing.

When the pulse voltage of certain frequency is added in the aqueous medium, when not having contact discharge between these the two poles of the earth of workpiece and wire electrode, can produce certain electric current through aqueous medium, and the sense of current immobilizes all the time.Exist in the aqueous medium a large amount of hydrogen-oxygens just/anion, the electric field electric current is strong more, in the aqueous medium just/anion is just active more.Such as processing situation for negative polarity; Under the effect of electric current between the two poles of the earth; Anion is poured into the processing work of positive polarity in a large number, and and processing work (metallic element) chemical reaction and electrolysis take place, produce certain thickness softening metamorphic layer on the processing work surface.Process time is long more, and softening metamorphic layer is just thick more.Softening metamorphic layer can have a strong impact on the surface roughness of processing work and the service life of processing work.

A kind of bipolar pulse power supply that the edm forming machine tool uses that is used for is arranged in the prior art; It is according to the electro discharge machining gapping place state, under discharge pulse rests state, between the two poles of the earth of edm; Through with the voltage of normal process polarity opposite polarity; Make the edm voltage across poles form bipolarity, i.e. the polarity of alternating discharge processing voltage across poles, the average voltage between the machining gap is almost equal to zero.But this bipolar pulse power supply uses the loop of power circuit that current-limiting resistance is arranged; And no current-limiting resistance mode is all adopted in the roughing discharge power loop of the unidirectional wire cutting machine pulse power, obtains the peak value processing electric current as far as possible, obtains high process velocity.Therefore; This technology can not effectively suppress electrolytic effect when the roughing of the unidirectional wire cutting machine pulse power; Thereby cause the surface quality inhomogeneities of processing work, be only applicable to spark-erosion sinking discharge lathe, can not satisfy thick, the accurately machined requirement of unidirectional wire cutting.

Also have a kind of processing power source circuit that is used for unidirectional wire cutting processing lathe in the prior art, the unidirectional wire cutting off machine is in the roughing process, when discharge gap voltage Vg is unloaded; Between processing work and wire electrode, add sine-shaped voltage; Form alternating current (being discharging gap electric current I g) between the discharging gap and can effectively suppress electrolytic effect, but during wire electrode and processing work conducting discharge, certain a spot of leakage current also can act on ion and workpiece generation electrolytic effect; If the long-time conducting discharge of wire electrode and processing work; Do not produce the discharge gap voltage zero load, or the discharge gap voltage zero load produces seldom, just can not add the machining voltage of opposite polarity so between processing work and the wire electrode; Or seldom can add the machining voltage of opposite polarity, the processing work layer that will produce electrolysis.Secondly, in this pulse power supply circuit current-limiting resistance is arranged, most of energy that this current-limiting resistance makes power supply provide consumes with the heat energy form, causes capacity usage ratio lower, can not satisfy the requirement of High-speed machining.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of alternating polarity pulse power, is used for the processing of numerical control electrical process machine.

In order to solve the problems of the technologies described above; The invention provides a kind of alternating polarity pulse power; Be used for the numerical control electrical process machine and through wire electrode processing work processed, this pulse power comprises the main loop that shakes, drives loop, loop of power circuit, detection loop and feedback circuit, wherein:

The said master loop that shakes is used to produce the benchmark discharge pulse signal, and adjusts said benchmark discharge pulse signal according to feedback signal;

Said driving loop links to each other with the said master loop that shakes, and is used for receiving and amplifying said reference pulse signal, and output first drives signal and second and drives signal;

Said loop of power circuit; Link to each other with said driving loop, wire electrode and processing work; Being used for driving signal according to said first provides the guide to puncture the edm voltage that detects in voltage and the fine finishining process in the roughing process for the discharging gap of said wire electrode and processing work, drives signal according to said second and at said discharging gap high-voltage great-current spark discharge energy is provided;

Said detection loop links to each other with said loop of power circuit, wire electrode and processing work, is used for the discharge condition of said roughing of real time on-line monitoring and fine finishining process electro discharge machining gapping place, and produces the processing detection signal according to said discharge condition;

Said feedback circuit links to each other with said detection loop and the main loop that shakes, and is used for producing said feedback signal according to said processing detection signal.

Preferably, said loop of power circuit comprises first loop of power circuit and second loop of power circuit, wherein:

Said first loop of power circuit links to each other with said driving loop, wire electrode and processing work, and being used for driving signal according to said first provides said guide to puncture detection voltage and edm voltage;

Said second loop of power circuit links to each other with said driving loop, wire electrode and processing work, and being used for driving signal according to said second provides said high-voltage great-current spark discharge energy.

Preferably, said first loop of power circuit comprises first power supply, first metal-oxide-semiconductor, second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and at least one current-limiting resistance, wherein:

First power supply is dc source, is used to provide said guide to puncture and detects voltage and said edm voltage;

Said first metal-oxide-semiconductor, draining perhaps directly connects the positive pole of said first power supply through current-limiting resistance, and source electrode perhaps directly connects said processing work through current-limiting resistance, and grid inserts first control signal;

Said second metal-oxide-semiconductor, draining perhaps directly connects the positive pole of said first power supply through current-limiting resistance, and source electrode perhaps directly connects said wire electrode through current-limiting resistance, and grid inserts second control signal;

Said the 3rd metal-oxide-semiconductor, drain electrode are through current-limiting resistance or directly connect said wire electrode, and source electrode passes through current-limiting resistance or directly connects the negative pole of said first power supply, and grid inserts the 3rd control signal;

Said the 4th metal-oxide-semiconductor, drain electrode are through current-limiting resistance or directly connect said processing work, and source electrode passes through current-limiting resistance or directly connects the negative pole of said first power supply, and grid inserts the 4th control signal;

Said at least one current-limiting resistance is used for puncturing said guide and detects voltage and the fine finishining process realizes metering function;

Wherein, the said first driving signal comprises said first control signal, second control signal, the 3rd control signal and the 4th control signal; Said first metal-oxide-semiconductor, second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor be alternation machining voltage polarity under the effect of said first control signal, second control signal, the 3rd control signal and the 4th control signal respectively.

Preferably, said second loop of power circuit comprises that second source and electric current provide circuit, wherein:

Second source is dc source, and being used for provides the edm energy in said roughing process, and the said electric current of anodal connection provides circuit, and negative pole connects said wire electrode;

Electric current provides circuit, connects the anodal and said processing work of said second source, is used for driving under the signal effect said second, to said discharging gap high-voltage great-current spark discharge energy is provided.

Preferably, said electric current provides the diode and the power MOS pipe of quantity such as circuit comprises, a diode is formed one with a power MOS pipe and is connected string, and be used to said discharging gap peak point current is provided, in each said connection string:

The anode of said diode connects the positive pole of said second source, and negative electrode connects the drain electrode of said power MOS pipe;

The source electrode of said power MOS pipe connects said processing work, and grid inserts said second and drives signal.

Preferably, said feedback circuit comprises unloaded treatment circuit, short circuit treatment circuit and regular picture treatment circuit, wherein:

Said unloaded treatment circuit; Link to each other with said detection loop and the main loop that shakes; Be used for producing unloaded feedback signal and send to the said master loop that shakes, make the said master loop that shakes change the gap voltage polarity between said processing work and the wire electrode according to the gap voltage airborne signals;

Said short circuit treatment circuit links to each other with said detection loop and the main loop that shakes, and is used for producing the short circuit feedback signal according to short-circuit signal, makes said second loop of power circuit output be beneficial to the discharge energy of edm stability;

Said regular picture treatment circuit links to each other with said detection loop and the main loop that shakes, and is used for producing the regular picture feedback signal according to the regular picture signal, makes said second loop of power circuit output be beneficial to the discharge energy that improves working (machining) efficiency;

Wherein, the said processing detection signal of said detection loop generation comprises said gap voltage airborne signals, short-circuit signal or regular picture signal.

Preferably, said detection loop does not detect said discharging gap in the work period of said benchmark discharge pulse signal breakdown, and then said discharge condition is unloaded discharge condition, exports said gap voltage airborne signals;

Said detection loop detects said discharging gap in the said work period breakdown; The gap voltage open circuit of then further judging said discharge pulse signal waits that the time of hitting is whether less than the time threshold to be hit of setting; Be that then said discharge condition is the short circuit dischange state; Export said short-circuit signal, otherwise said discharge condition is the regular picture state, exports said regular picture signal.

Preferably, the said short circuit feedback signal that said short circuit treatment circuit produces comprises that discharge pulse width setup value and discharge pulse under the short circuit dischange state rests setting value;

Wherein, Discharge pulse width setup value under the said short circuit dischange state is less than the discharge pulse width setup value under the regular picture state, and the discharge pulse under the said short circuit dischange state rests setting value and rests setting value greater than the discharge pulse under the regular picture state.

Preferably, the said regular picture feedback signal that said regular picture treatment circuit produces comprises that discharge pulse width setup value and discharge pulse under the regular picture state rests setting value.

An embodiment of the alternating polarity pulse power of the present invention has solved traditional unidirectional wire cutting machine and has added the processing work surface electrolytic effect that exists man-hour; Make the unidirectional wire cutting machine from roughing to the fine finishining process; Be implemented in the polarity of automatic alternation machining voltage between the discharging gap fully, form alternating current discharge electric current between the discharging gap, can not form the required electric field of electrolysis; Effectively suppress electrolytic effect, improved workpiece surface quality.The pulse power of the present invention is applicable to electric spark linear cutting machine and spark-erosion sinking lathe, especially the unidirectional wire cutting off machine.Certainly technical scheme of the present invention is equally applicable to quick-wire-moving linear cutting machine (to-and-fro thread wire cutting machine tool).

Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in specification, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.

Description of drawings

Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the pulse power structural representation of unidirectional wire cutting machine in the prior art;

Fig. 2 is the structural representation of alternating polarity pulse power embodiment of the present invention;

Fig. 3 is the structural representation of first loop of power circuit, first embodiment among the present invention;

Fig. 4 is the structural representation of first loop of power circuit, second embodiment among the present invention;

Fig. 5 is the structural representation of first loop of power circuit the 3rd embodiment among the present invention;

Fig. 6 is the structural representation of first loop of power circuit the 4th embodiment among the present invention;

Fig. 6-1 is the structural representation of first loop of power circuit the 5th embodiment among the present invention;

Fig. 7 is the structural representation of first loop of power circuit the 6th embodiment among the present invention;

Fig. 7-1 is the structural representation of first loop of power circuit the 7th embodiment among the present invention;

Fig. 8 is the structural representation of first loop of power circuit the 8th embodiment among the present invention;

Fig. 9 is the structural representation of the second loop of power circuit embodiment among the present invention;

Figure 10 is the operation principle sketch map of first loop of power circuit under the effect of gap voltage airborne signals;

Figure 11 is the operation principle sketch map of first and second loop of power circuit under the roughing pattern;

Figure 12 is the operation principle sketch map of first loop of power circuit under the fine finishining pattern.

The specific embodiment

Below will combine accompanying drawing and embodiment to specify embodiment of the present invention, how the application technology means solve technical problem to the present invention whereby, and the implementation procedure of reaching technique effect can make much of and implement according to this.

Fig. 2 is the structural representation of alternating polarity pulse power embodiment of the present invention.As shown in Figure 2; This embodiment mainly comprises the main loop 210 that shakes, drive loop 220, first loop of power circuit 230, second loop of power circuit 240, detect loop 250, unloaded treatment circuit 260, short circuit treatment circuit 270 and regular picture treatment circuit 280, wherein:

The main loop 210 that shakes; Link to each other with driving loop 220, unloaded treatment circuit 260, short circuit treatment circuit 270 and regular picture treatment circuit 280; Be used to produce the benchmark discharge pulse signal, and adjust this benchmark discharge pulse signal according to unloaded feedback signal, the short circuit feedback signal of short circuit treatment circuit 270 generations and the regular picture feedback signal that regular picture treatment circuit 280 produces that unloaded treatment circuit 260 sends;

Drive loop 220; Link to each other with shake loop 210, first loop of power circuit 230 and second loop of power circuit 240 of this master; Be used for receiving and amplifying this reference pulse signal; Output first drives signal and second and drives signal, sends to first loop of power circuit 230 and second loop of power circuit 240 (wherein the first driving signal sends to these first loop of power circuit, 230, the second driving signals and sends to this second loop of power circuit 240) respectively;

First loop of power circuit 230; Link to each other with this driving loop 220, wire electrode 291 and processing work 292; Be used for first driving signal and providing the guide to puncture detection voltage for the discharging gap of wire electrode 291 and processing work 292, for the high-voltage great-current spark discharge of follow-up second loop of power circuit 240 provides discharge channel in the roughing process according to what drive loop 220 outputs; In unidirectional wire cutting machine fine finishining process, only this loop (i.e. first loop of power circuit 230) provides the fine finishining energy of little electric current spark discharge between the discharging gap of processing work 292 and wire electrode 291;

Second loop of power circuit 240 links to each other with this driving loop 220, wire electrode 291 and processing work 292, and being used for driving signal according to second provides high-voltage great-current spark discharge energy between the discharging gap of wire electrode 291 and processing work 292; This loop generally is used for unidirectional wire cutting machine roughing process;

Detect loop 250; Link to each other with this first loop of power circuit 230, second loop of power circuit 240, wire electrode 291, processing work 292, unloaded treatment circuit 260, short circuit treatment circuit 270 and regular picture treatment circuit 280; Be used for three kinds of discharge conditions such as zero load, short circuit and regular picture in this roughing of real time on-line monitoring and the fine finishining process electro discharge machining gapping place; And produce gap voltage airborne signals, short-circuit signal or regular picture signal respectively according to concrete discharge condition; (the gap voltage airborne signals sends to unloaded treatment circuit 260 to send to unloaded treatment circuit 260, short circuit treatment circuit 270 and regular picture treatment circuit 280 respectively; Short-circuit signal sends to short circuit treatment circuit 270, and the regular picture signal sends to regular picture treatment circuit 280);

Unloaded treatment circuit 260; Link to each other with this detection loop 250 and the main loop 210 that shakes; Be used for producing unloaded feedback signal and send to the main loop 210 that shakes, make the main loop 210 that shakes change gap voltage between processing works 292 and the wire electrode 291 in the polarity of work period (like the ON cycle) lining of next discharge pulse according to this gap voltage airborne signals;

Short circuit treatment circuit 270 links to each other with this detection loop 250 and the main loop 210 that shakes, and is used for producing the short circuit feedback signal according to this short-circuit signal; With the discharge pulse width setup value T under the short circuit dischange state _On1And discharge pulse rests setting value T _Off1Send to the main loop 210 that shakes together,, help the stability of edm so that second loop of power circuit 240 is exported smaller discharge energy; Wherein this short circuit feedback signal comprises discharge pulse width setup value T _On1And discharge pulse rests setting value T _Off1, this discharge pulse width setup value T _On1Less than the discharge pulse width setup value T under the regular picture state _On2, this discharge pulse rests setting value T _Off1Rest setting value T greater than the discharge pulse under the regular picture state _Off2

Regular picture treatment circuit 280 links to each other with this detection loop 250 and the main loop 210 that shakes, and is used for producing the regular picture feedback signal according to this regular picture signal, with the discharge pulse width setup value T under the regular picture state _On2Rest setting value T with discharge pulse _Off2Send to this master loop 210 that shakes together, make the bigger discharge energy of these second loop of power circuit, 240 outputs, be beneficial to improve the working (machining) efficiency of edm.

The first above-mentioned loop of power circuit 230 and second loop of power circuit 240 are referred to as loop of power circuit 290 in the present embodiment.The discharging gap that this loop of power circuit 290 is this wire electrode and processing work in the roughing process according to this first driving signal provides the guide to puncture detection voltage, at this discharging gap high-voltage great-current spark discharge energy is provided according to this second driving signal.

Above-mentioned unloaded treatment circuit 260, short circuit treatment circuit 270 and regular picture treatment circuit 280 are referred to as feedback circuit 295 in the present embodiment; This feedback circuit 295 links to each other with this detection loop 250 and the main loop 210 that shakes, and is used for producing feedback signal according to this processing detection signal; Wherein, this processing detection signal comprises aforesaid gap voltage airborne signals, short-circuit signal or regular picture signal, and this feedback signal comprises aforesaid unloaded feedback signal, short circuit feedback signal or regular picture feedback signal.

If above-mentioned detection loop 250 does not detect the breakdown signal in gap (it is breakdown also promptly not detect discharging gap) in the ON of current benchmark discharge pulse signal the cycle; Think that then discharging gap is in Light Condition, output gap voltage airborne signals sends to unloaded treatment circuit 260.If detect the breakdown signal in gap (it is breakdown also promptly to detect discharging gap) in the cycle, to the gap voltage open circuit time T to be hit of current discharge pulse signal at the ON of current benchmark discharge pulse signal _dWith set wait to hit time threshold T _D0Compare: if T _d＜T _D0, then judging present discharge pulse is short circuit pulse, this moment, the duty of power supply was a short-circuit condition, produced short-circuit signal and sent to short circuit treatment circuit 270; If T _d>=T _D0, then judging this pulse is the regular picture pulse, this moment, the duty of power supply was the regular picture state, produced the regular picture signal and sent to regular picture treatment circuit 280.

Fig. 3 is the structural representation of first loop of power circuit, first embodiment among the power supply embodiment shown in Figure 2.In conjunction with power supply embodiment shown in Figure 2; The first loop of power circuit embodiment shown in Figure 3 mainly comprises first metal oxide semiconductor field effect tube (MOS) pipe T1, the second metal-oxide-semiconductor T2, the 3rd metal-oxide-semiconductor T3, the 4th metal-oxide-semiconductor T4, the first power supply E1 and current-limiting resistance R31; Wherein drive this first driving signal that sends in loop 220 and comprise the first control signal P1, the second control signal P2, the 3rd control signal P3 and the 4th control signal P4, and:

The first power supply E1 is adjustable dc source, can export the voltage of 50-200V, is used to provide that the discharging gap guide punctures the energy of detection and the edm energy under the fine finishining pattern under the roughing pattern; The drain electrode of the anodal connection first metal-oxide-semiconductor T1 and the drain electrode of the second metal-oxide-semiconductor T2, negative pole connects the source electrode of the 3rd metal-oxide-semiconductor T3 and the source electrode of the 4th metal-oxide-semiconductor T4;

The first metal-oxide-semiconductor T1 is power MOS pipe, and drain electrode connects the positive pole of the first power supply E1, and source electrode connects drain electrode and the workpiece 292 of the 4th metal-oxide-semiconductor T4, and grid inserts the first control signal P1;

The second metal-oxide-semiconductor T2 is power MOS pipe, and drain electrode connects the positive pole of the first power supply E1, and source electrode connects the drain electrode of the 3rd metal-oxide-semiconductor T3 and first end 1 of current-limiting resistance R31, and grid inserts the second control signal P2;

The 3rd metal-oxide-semiconductor T3 is power MOS pipe, and source electrode connects the negative pole of the first power supply E1, and drain electrode connects the source electrode of the 3rd metal-oxide-semiconductor T3 and first end 1 of current-limiting resistance R31, and grid inserts the 3rd control signal P3;

The 4th metal-oxide-semiconductor T4 is power MOS pipe, and source electrode connects the negative pole of the first power supply E1, and drain electrode connects source electrode and the workpiece 292 of the first metal-oxide-semiconductor T1;

Current-limiting resistance R31 is adjustable resistance, and its Standard resistance range is 10-500 Ω, and the size of peak point current also promptly plays metering function when being used to limit the energy output of first loop of power circuit 230; Its first end 1 connects the source electrode of the second metal-oxide-semiconductor T2, second end, 2 connection electrode silks 291.

In technical scheme of the present invention; First loop of power circuit 230 is a kind of bridge balancing circuits; Current-limiting resistance wherein can be arranged on other place of first loop of power circuit in a variety of forms, can puncture the effect of playing current limliting in voltage and the fine finishining process that detects the guide equally; And the effect that under the control of the first control signal P1, the second control signal P2, the 3rd control signal P3, the 4th control signal P4, realizes alternation machining voltage polarity.Fig. 4 to Fig. 8 has provided (comprising Fig. 6-1 and Fig. 7-1) structural representation of other several kinds first loop of power circuit embodiment respectively.Below difference key diagram 4 is to the difference of each first loop of power circuit embodiment shown in Figure 8 and first loop of power circuit, first embodiment shown in Figure 3.Need to prove, below current-limiting resistance among each first loop of power circuit embodiment, as specifying; Then all play aforesaid metering function; And the resistor network that each current-limiting resistance is formed can be the multiple network form, and the distributing position of each current-limiting resistance also is flexile; The distributing position of current-limiting resistance among each embodiment of first loop of power circuit shown in Fig. 3 to Fig. 8 (comprising Fig. 6-1 and Fig. 7-1) also only is a part of network form that realizes current-limiting function in the first loop of power circuit function.

First loop of power circuit, second embodiment shown in Fig. 4 comprises current-limiting resistance R41, compares with embodiment illustrated in fig. 3, and wherein first end, 1 joining work pieces, 292, the second ends 2 of current-limiting resistance R41 connect the source electrode of the first metal-oxide-semiconductor T1 and the drain electrode of the 4th metal-oxide-semiconductor T4; The direct connection electrode silk 291 of the drain electrode of the source electrode of the second metal-oxide-semiconductor T2 and the 3rd metal-oxide-semiconductor T3.The annexation of all the other parts and running relation see also aforementioned description embodiment illustrated in fig. 3 in embodiment illustrated in fig. 4, repeat no more here.

First loop of power circuit the 3rd embodiment shown in Fig. 5 comprises the first current-limiting resistance R51 and the second current-limiting resistance R52; With Fig. 3 and embodiment illustrated in fig. 4 comparing; Wherein the connected mode of the first current-limiting resistance R51 is identical with current-limiting resistance R31 in embodiment illustrated in fig. 3, and the connected mode of the second current-limiting resistance R52 is identical with current-limiting resistance R41 in embodiment illustrated in fig. 4.The annexation of all the other parts and running relation see also earlier figures 3 and description embodiment illustrated in fig. 4 in embodiment illustrated in fig. 5, repeat no more here.

First loop of power circuit the 4th embodiment shown in Fig. 6 compares with embodiment illustrated in fig. 3, and first end 1 of the first current-limiting resistance R61 connects the source electrode of the first metal-oxide-semiconductor T1, and second end 2 connects first end 1 and workpiece 292 of the 4th current-limiting resistance R64; First end 1 of the second current-limiting resistance R62 connects the source electrode of the second metal-oxide-semiconductor T2, and second end 2 connects first end 1 and wire electrode 291 of the 3rd current-limiting resistance R63; First end, the 1 connection electrode silk 291 of the 3rd current-limiting resistance R63 and second end 2 of the second current-limiting resistance R62; First end, 1 joining work pieces, 292, the second ends 2 of the 4th current-limiting resistance R64 connect second end 2 of the first current-limiting resistance R61.The annexation of all the other parts and running relation see also aforementioned description embodiment illustrated in fig. 3 in embodiment illustrated in fig. 6, repeat no more here.

First loop of power circuit the 5th embodiment shown in Fig. 6-1 compares with embodiment illustrated in fig. 6, and first end 1 of the first current-limiting resistance R65 connects the positive pole of the first power supply E1, and second end 2 connects the drain electrode of the first metal-oxide-semiconductor T1; The source electrode of the first metal-oxide-semiconductor T1 connects first end 1 and workpiece 292 of the 4th current-limiting resistance R68, and grid inserts the first control signal P1; First end 1 of the second current-limiting resistance R66 connects the positive pole of the first power supply E1, and second end 2 connects the drain electrode of the second metal-oxide-semiconductor T2, and the source electrode of the second metal-oxide-semiconductor T2 connects first end 1 and wire electrode 291 of the 3rd current-limiting resistance R67, and grid inserts the second control signal P2; First end, the 1 connection electrode silk 291 of the 3rd current-limiting resistance R67 and the source electrode of the second metal-oxide-semiconductor T3, second end 2 connects the drain electrode of the 3rd metal-oxide-semiconductor T3; The source electrode of the 3rd metal-oxide-semiconductor T3 connects the negative pole of the first power supply E1, and grid inserts the 3rd control signal P3; First end, 1 joining work pieces 292 of the 4th current-limiting resistance R68 and the source electrode of the first metal-oxide-semiconductor T1, second end 2 connects the drain electrode of the 4th metal-oxide-semiconductor T4; The source electrode of the 4th metal-oxide-semiconductor T4 connects the negative pole of the first power supply E1, and abreviation inserts the 4th control signal.The annexation of all the other parts and running relation see also aforementioned description embodiment illustrated in fig. 6 in Fig. 6-1 illustrated embodiment, repeat no more here.

First loop of power circuit the 6th embodiment shown in Fig. 7 compares with embodiment illustrated in fig. 6, and the connected mode of the first current-limiting resistance R71 is identical with the first current-limiting resistance R61, and the connected mode of the second current-limiting resistance R72 is identical with the second current-limiting resistance R62; The drain electrode connection electrode silk 291 of the 3rd metal-oxide-semiconductor T3, source electrode connects the negative pole of the first power supply E1, the drain electrode joining work pieces 292 of the 4th metal-oxide-semiconductor T4, source electrode connects the negative pole of the first power supply E1.The annexation of all the other parts and running relation see also aforementioned description embodiment illustrated in fig. 6 in embodiment illustrated in fig. 7, repeat no more here.

First loop of power circuit the 7th embodiment shown in Fig. 7-1 compares with Fig. 6-1 illustrated embodiment, and the connected mode of the first current-limiting resistance R75 is identical with the first current-limiting resistance R65, and the connected mode of the second current-limiting resistance R76 is identical with the second current-limiting resistance R66; The drain electrode connection electrode silk 291 of the 3rd metal-oxide-semiconductor T3, source electrode connects the negative pole of the first power supply E1, the drain electrode joining work pieces 292 of the 4th metal-oxide-semiconductor T4, source electrode connects the negative pole of the first power supply E1.The annexation of all the other parts and running relation see also the description of earlier figures 6-1 illustrated embodiment in Fig. 7-1 illustrated embodiment, repeat no more here.

First loop of power circuit the 8th embodiment shown in Fig. 8 compares with embodiment illustrated in fig. 6, and the connected mode of the first current-limiting resistance R81 is identical with the 3rd current-limiting resistance R63, and the connected mode of the second current-limiting resistance R82 is identical with the 4th current-limiting resistance R64; The drain electrode of the first metal-oxide-semiconductor T1 connects the positive pole of the first power supply E1, and the drain electrode of source electrode joining work pieces 292, the second metal-oxide-semiconductor T2 connects the positive pole of the first power supply E1, source electrode connection electrode silk 291.The annexation of all the other parts and running relation see also aforementioned description embodiment illustrated in fig. 6 in embodiment illustrated in fig. 8, repeat no more here.

Fig. 9 is the structural representation of the second loop of power circuit embodiment among the power supply embodiment shown in Figure 2.In conjunction with power supply embodiment shown in Figure 2, the second loop of power circuit embodiment shown in Figure 9 comprises that mainly second source E2 and electric current provide circuit 910, wherein:

Second source E2 is adjustable dc source, also can make the dc source of fixing output in other embodiments, can export the high pressure of 200-400V, is used for second loop of power circuit, 240 edm energy needed under the roughing pattern; The anodal electric current that connects provides circuit 910, negative pole connection electrode silk 291;

Electric current provides circuit 910; Connect second source E2 and workpiece 292; Under driving second driving signal (illustrating with P5 among the figure) effect of sending in loop 220, high-voltage great-current spark discharge energy is provided between the discharging gap of wire electrode 291 and workpiece 292, workpiece 292 is processed.

As shown in Figure 9; This electric current provide circuit 910 mainly comprise some diodes (among the figure respectively with D5, D6 ..., Dn illustrates) and with the power MOS pipe of diode equal number form some be connected string (among the figure respectively with T5, T6 ..., Tn illustrates); The connection string of forming with diode D5 and power MOS pipe T5 is the structure that this electric current of example explanation provides circuit 910, particularly:

Diode D5, anode connects the positive pole of second source E2, and negative electrode connects the drain electrode of power MOS pipe T5;

Power MOS pipe T5, drain electrode connects the negative electrode of diode D5, source electrode joining work pieces 292, grid inserts this second driving signal.

Electric current provides in the circuit 910 other the diode and the connected mode of power MOS pipe, and is identical with the connected mode of diode D5 and power MOS pipe T5, connects the positive pole of second source E2 such as the anode of diode D6, and negative electrode connects the drain electrode of power MOS pipe T6; The drain electrode of power MOS pipe T6 connects the negative electrode of diode D6, source electrode joining work pieces 292, and grid inserts this second driving signal; The rest may be inferred for the connected mode of all the other diodes and power MOS pipe, repeats no more here.The connection string of a plurality of diodes and power MOS pipe can be used for to discharging gap bigger peak point current being provided.

Figure 10 is the operation principle sketch map of first loop of power circuit 230 under the effect of gap voltage airborne signals.See also Fig. 3 and Figure 10; At t1 constantly; When the first control signal P1 and the 3rd control signal P3 are high level, when the second control signal P2 and the 4th control signal P4 were low level, the second metal-oxide-semiconductor T2 and the 4th metal-oxide-semiconductor T4 in first loop of power circuit 230 ended; The first metal-oxide-semiconductor T1 and the 3rd metal-oxide-semiconductor T3 conducting are loaded into machining voltage on wire electrode 291 and the workpiece 292; At this moment, workpiece 292 is a positive polarity, and wire electrode 291 is a negative polarity, also is that the guide punctures that to detect voltage be negative polarity; Gap voltage Vg-between workpiece 292 and the wire electrode 291 is not higher than gap breakdown detection reference voltage V-on the negative polarity machine direction, and the decidable gap voltage is Light Condition on the negative polarity machine direction.After the first control signal P1 that is provided with and the 3rd control signal P3 high level time end; At t2 constantly; The first control signal P1 and the 3rd control signal P3 become low level, and the second control signal P2 and the 4th control signal P4 become high level, and the first metal-oxide-semiconductor T1 and the 3rd metal-oxide-semiconductor T3 in first loop of power circuit 230 end; The second metal-oxide-semiconductor T2 and the 4th metal-oxide-semiconductor T4 conducting are loaded into machining voltage on wire electrode 291 and the workpiece 292; At this moment, workpiece 292 becomes negative polarity, and wire electrode 291 becomes positive polarity, also is that the guide punctures that to detect voltage be positive polarity; Gap voltage Vg+ between workpiece 292 and the wire electrode 291 is not lower than gap breakdown detection reference voltage V+ on the positive polarity machine direction, and the decidable gap voltage is Light Condition on the positive polarity machine direction.Equally, after the second control signal P2 that is provided with and the 4th control signal P4 high level time end, constantly at t3; The second control signal P2 and the 4th control signal P4 become low level; The first control signal P1 and the 3rd control signal P3 become high level, and the second metal-oxide-semiconductor T2 and the 4th metal-oxide-semiconductor T4 in first loop of power circuit 230 end, the first metal-oxide-semiconductor T1 and the 3rd metal-oxide-semiconductor T3 conducting; Be loaded into machining voltage on wire electrode 291 and the workpiece 292, the guide punctures detection voltage and has become negative polarity again.

Therefore, when the gap voltage between workpiece 292 and the wire electrode 291 was Light Condition, the guide that system produces alternating polarity automatically punctured detection voltage, make gap voltage Vg with the fixed cycle just/negative both direction alternation.The gap average voltage is tending towards 0 volt like this, in the aqueous medium just/anion is in not mobile status, effectively prevented the electrolytic etching surface of the work.

Figure 11 is the operation principle sketch map of first loop of power circuit 230 under the roughing pattern and second loop of power circuit 240.See also Fig. 3, Fig. 9 and Figure 11; In the t11 period; The first control signal P1 and the 3rd control signal P3 are high level, and the second control signal P2 and the 4th control signal P4 are low level, and second metal-oxide-semiconductor T2 in first loop of power circuit 230 and the 4th metal-oxide-semiconductor T4 turn-off; The first metal-oxide-semiconductor T1 and the 3rd metal-oxide-semiconductor T3 conducting puncture detection voltage to little energy guide and are loaded on wire electrode 291 and the workpiece 292; At this moment, workpiece 292 is a positive polarity, and wire electrode 291 is a negative polarity, is the negative polarity processing mode.Before the first control signal P1 that is provided with and the 3rd control signal P3 high level time end; When if the gap voltage Vg between workpiece 292 and the wire electrode 291 is higher than on the negative polarity machine direction gap breakdown detection reference voltage V-, decidable discharging gap this moment is breakdown conditions on the negative polarity machine direction.The first control signal P1 and the 3rd control signal P3 high level become low level; First loop of power circuit 230 quits work; The gap voltage open circuit that detects this discharge pulse simultaneously wait to hit time T d (being equal to the t11 duration) with set wait that hitting time threshold Td0 compares; This moment, Td＞Td0 then judged to be the regular picture state between discharge electrode.

T12 is after the period, with the discharge pulse width setup value T under the regular picture state for process _On2Rest setting value T with discharge pulse _Off2Send to the main loop 210 that shakes together; The master shakes loop 210 according to discharge pulse width setup value T _On2, make second to drive signal P5 output high level, open the power switch pipe of second loop of power circuit 240, the big electric current processing of peak value between the discharge electrode of realization t13 period.

Rest setting value T through discharge pulse under the regular picture state of t14 period _Off2After, the first control signal P1 and the 3rd control signal P3 signal continue the output high level in the t15 period, puncture detection voltage to little energy guide once more and are loaded on wire electrode 291 and the workpiece 292.After detecting the discharging gap puncture, second loop of power circuit, 240 work of t17 period, the big electric current processing of peak value once more between discharge electrode.

In the t19 period, detect the gap voltage open circuit time T to be hit of this discharge pulse _d(being equal to the t19 duration) with set wait to hit time threshold T _D0Compare, at this moment T _d＜T _D0, then judge to be short-circuit condition between discharge electrode.T20 is after the period for process, the discharge pulse width setup value T under the short circuit dischange state _On1Rest setting value T with pulse _Off1Send to the main loop 210 that shakes together; Electronic pulse width setting value T is transferred according to this short-circuit signal in the main loop 210 that shakes _On1Make second to drive signal P5 output high level; Open the power switch pipe of second loop of power circuit 240; High peak current processing between the discharge electrode of realization t21 period, but the discharge energy of this moment is less than the regular picture energy of t13 and t17 period, has effectively reduced the possibility of wire electrode 291 fracture of wires in the processing.

The main loop 210 statistics guides that shake puncture the continuous discharge time of voltage on the negative polarity machine direction of detecting; If the temporal summation of t11+t12+t13+t14+t15+t16+t17+t18+t19+t20+t21+t22 reaches the time of setting during threshold values, next guide punctures and detects voltage and just will change over the positive polarity processing mode.In the t23 period; The second control signal P2 and the 4th control signal P4 output high level; The first control signal P1 and the 3rd control signal P3 are low level; First metal-oxide-semiconductor T1 in first loop of power circuit 230 and the 3rd metal-oxide-semiconductor T3 turn-off, and the second metal-oxide-semiconductor T2 and the 4th metal-oxide-semiconductor T4 conducting puncture detection voltage to little energy guide and be loaded on wire electrode 291 and the workpiece 292; At this moment, workpiece 292 is a negative polarity, and wire electrode 291 is a positive polarity, is the positive polarity processing mode; T23 and t27 period Vg waveform puncture the detection voltage waveform for the guide under the positive polarity processing mode; T25 and t29 period are the working condition of opening second loop of power circuit 240 under the positive polarity processing mode.

The unidirectional wire cutting machine is under the roughing pattern; System has realized that automatic alternation guide punctures the polarity that detects voltage; Make under the interpolar continuous discharge state, avoided edm under a fixed polarity mode for a long time, cause the phenomenon that electrolytic effect causes processing work 292 soften layers to increase the weight of.Puncture the polarity that detects voltage through the alternation guide, make the gap average voltage roughly be tending towards 0 volt, in the aqueous medium just/anion is in not mobile status, effectively prevented the generation of electrolytic effect.

Figure 12 is the operation principle sketch map of first loop of power circuit 230 under the fine finishining pattern.See also Fig. 3 and Figure 12; Under the fine finishining pattern, only first loop of power circuit 230 provides energy between discharge electrode, through changing the resistance size of the current-limiting resistance R31 in first loop of power circuit 230; Can change the size of peak point current between discharge electrode, just change the size of energy between discharge electrode.This mode has realized the unidirectional wire cutting off machine when repeatedly cutting, and is better repaiied through the size of energy between the change discharge electrode and cuts processed surface smoothness.

In the t71 period, the first control signal P1 and the 3rd control signal P3 are the branch group pulse of fixed frequency, and the second control signal P2 and the 4th control signal P4 are low level, and the second metal-oxide-semiconductor T2 and the 4th metal-oxide-semiconductor T4 in first loop of power circuit 230 turn-off all the time.The first metal-oxide-semiconductor T1 and the 3rd metal-oxide-semiconductor T3 conducting during according to the high level of minute group pulse, the first metal-oxide-semiconductor T1 and the 3rd metal-oxide-semiconductor T3 turn-off during low level.When the first metal-oxide-semiconductor T1 and the 3rd metal-oxide-semiconductor T3 conducting, be loaded into machining voltage on wire electrode 291 and the workpiece 292; At this moment, workpiece 292 is a positive polarity, and wire electrode 291 is a negative polarity, realizes negative polarity processing mode between discharge electrode.In the t72 period; After first control signal P1 that is provided with and the grouping burst length of the 3rd control signal P3 end; The first control signal P1 and the 3rd control signal P3 become low level; The second control signal P2 and the 4th control signal P4 become the branch group pulse for fixed frequency; The first metal-oxide-semiconductor T1 in first loop of power circuit 230 and the 3rd metal-oxide-semiconductor T3 turn-off, and the second metal-oxide-semiconductor T2 and the 4th metal-oxide-semiconductor T4 conducting during according to the high level of minute group pulse is loaded into machining voltage on wire electrode 291 and the workpiece 292; At this moment, workpiece 292 is a negative polarity, and wire electrode 291 is a positive polarity, realizes positive polarity processing mode between discharge electrode.T71 and t73 period, when the Vg waveform is 230 work of first loop of power circuit, open-circuit condition voltage waveform between the discharge electrode under the negative polarity processing mode; T72 and t74 period, when the waveform of Vg is 230 work of first loop of power circuit, open-circuit condition voltage waveform between the discharge electrode under the positive polarity processing mode.The t75 period, when the Vg waveform is 230 work of first loop of power circuit, under the negative polarity processing mode, the machining state voltage waveform between discharge electrode; The t76 period, when the Vg waveform is 230 work of first loop of power circuit, under the positive polarity processing mode, the machining state voltage waveform between discharge electrode.

Therefore, under unidirectional wire cutting machine fine finishining pattern, the polarity between discharge electrode automatically produces alternation with the fixed cycle, make gap voltage Vg just/negative both direction alternation.The gap average voltage is tending towards 0 volt like this, in the aqueous medium just/anion is in not mobile status, effectively prevented the generation of electrolytic effect.Under equal edm energy condition, the surface smoothness of processing work is improved.

Technical scheme of the present invention has the function of low pressure guide puncture, high-voltage great-current Compound Machining.In first loop of power circuit 230 shown in Figure 3, under the first metal-oxide-semiconductor T1 and the 3rd metal-oxide-semiconductor T3 conducting simultaneously, the second metal-oxide-semiconductor T2 and the 4th metal-oxide-semiconductor T4 end, and realize providing negative polarity processing guide to puncture detection voltage to interpolar; Or second under metal-oxide-semiconductor T2 and the 4th metal-oxide-semiconductor T4 conducting simultaneously, and the first metal-oxide-semiconductor T1 and the 3rd metal-oxide-semiconductor T3 end, and realizing provides positive polarity processing guide to puncture detection voltage to interpolar.After detecting the interpolar puncture, the first metal-oxide-semiconductor T1, the second metal-oxide-semiconductor T2, the 3rd metal-oxide-semiconductor T3 and the 4th metal-oxide-semiconductor T4 end, and second loop of power circuit 240 shown in Figure 9 is started working, and each power MOS pipe conducting provides the high-voltage great-current machining energy to interpolar.Because the voltage of dc source E1 is less than the voltage of dc source E2, and current-limiting resistance is adjustable in first loop of power circuit 230, the energy that provides to interpolar is less than the energy of second loop of power circuit 240.Realized that the little electric current of low pressure punctures the Compound Machining function of high-voltage great-current edm.

In the technical scheme of the present invention, when gap voltage was Light Condition under the roughing pattern, the guide who produces alternating polarity automatically punctured detection voltage system.Under the first metal-oxide-semiconductor T1 and the conducting simultaneously of the 3rd metal-oxide-semiconductor T3 power tube, the second metal-oxide-semiconductor T2 and the 4th metal-oxide-semiconductor T4 power tube end, and having realized provides negative polarity processing guide to puncture detection voltage to interpolar.If do not detect the interpolar breakdown signal, automatically the first metal-oxide-semiconductor T1 and the 3rd metal-oxide-semiconductor T3 power tube are ended, the conducting simultaneously of the second metal-oxide-semiconductor T2 and the 4th metal-oxide-semiconductor T4 power tube provides positive polarity processing guide to puncture detection voltage to interpolar, sees also Figure 10.When having realized that gap voltage is Light Condition, the polarity of automatic alternation interpolar open-circuit voltage, making gap voltage is 0 volt, has effectively prevented the generation of electrolytic effect.

In the technical scheme of the present invention, interpolar continues under the high-voltage great-current discharge condition, has avoided the function of edm under a fixed polarity mode for a long time.Continuous high-voltage great-current edm; When puncturing the polarity that detects voltage and remain unchanged for a long time like the guide; Referring to Figure 11; The first metal-oxide-semiconductor T1, the 3rd metal-oxide-semiconductor T3 power tube batch (-type) conducting provide the negative polarity guide to puncture detection voltage in t11, t15, t19 time period to interpolar, and the statistics guide punctures the continuous discharge time of voltage on this polarity machine direction of detecting; When if the summation of continuous discharge time reaches default value; Through the main loop that shakes the first metal-oxide-semiconductor T1 in first loop of power circuit, the 3rd metal-oxide-semiconductor T3 power tube are become and to end, the second metal-oxide-semiconductor T2, the 4th metal-oxide-semiconductor T4 power tube conducting puncture next guide to detect voltage just to change over the positive polarity processing mode.Realize 0 volt of interpolar machining gap voltage convergence, avoided edm under a fixed polarity mode for a long time, thereby caused the generation of electrolysis phenomenon.

The short circuit pulse that technical scheme of the present invention possesses in the high-voltage great-current processing detects and processing capacity.Under low pressure guide puncture, high-voltage great-current Compound Machining mode, detect the low pressure guide earlier and puncture the open circuit time T to be hit that detects voltage _d(being equal to the t11 time) referring to Figure 11 with set wait to hit time threshold values T _D0Compare, like T _d＞T _D0, then judge to be the regular picture state between discharge electrode.Pulse T under the regular picture state _On2Value makes second of the second driving loop drive signal P5 output high level, according to T under the normal condition to the main loop that shakes _On2ON time is opened the power switch pipe of second loop of power circuit, high peak current processing between the discharge electrode of realization t13 period.If T _d＜T _D0Then judge and be short-circuit condition between discharge electrode.Pulse T under the short circuit dischange state _On1Value makes second of the second driving loop drive signal P5 output high level, according to T under the short-circuit condition to the main loop that shakes _On1ON time is opened the power switch pipe of second loop of power circuit 240, high peak current processing between the discharge electrode of realization t21 period, but the discharge energy of this moment is less than the regular picture energy of t13 and t17 period, has effectively reduced the possibility of fracture of wire in the processing.Realized the automatic detection of interpolar individual pulse discharge condition, the fracture of wire that the long-time edm of short circuit when having avoided high-voltage great-current is caused.

Technical scheme of the present invention possesses voltage function between the discharge electrode that produces alternating polarity under the fine finishining pattern automatically.Under the fine finishining pattern; The first control signal P1, the second control signal P2, the 3rd control signal P3 and the 4th control signal P4 in main circuit controls first loop of power circuit that shakes; The timesharing conducting first metal-oxide-semiconductor T1, the 3rd metal-oxide-semiconductor T3, by the second metal-oxide-semiconductor T2, the 4th metal-oxide-semiconductor T4, or the conducting second metal-oxide-semiconductor T2, the 4th metal-oxide-semiconductor T4; By the first metal-oxide-semiconductor T1, the 4th metal-oxide-semiconductor T4; Make the polarity of voltage between discharge electrode automatically produce alternation with the fixed cycle, make gap voltage Vg just/negative both direction alternation, referring to Figure 12.The gap average voltage is tending towards 0 volt like this, in the aqueous medium just/anion is in not mobile status, effectively prevented the generation of electrolytic effect, reduced the processing work surface roughness, improved workpiece surface quality.

Positive and negative two the processing polar voltages and the electric current of first loop of power circuit is equal fully in the technical scheme of the present invention.Visible by Fig. 3; First loop of power circuit is a kind of typical bridge circuit, and under positive polarity processing or negative polarity processing mode, the impedance of first loop of power circuit and dc source are duplicate; When the first metal-oxide-semiconductor T1, the 3rd metal-oxide-semiconductor T3 power switch pipe conducting; The second metal-oxide-semiconductor T2, the 4th metal-oxide-semiconductor T4 power switch pipe by the time, give the amplitude and the current value of the reverse voltage that adds between discharge electrode, with the second metal-oxide-semiconductor T2, the 4th metal-oxide-semiconductor T4 power switch pipe conducting; By the first metal-oxide-semiconductor T1, when the 3rd metal-oxide-semiconductor T3 power switch pipe ends; Give the amplitude and the current value of the positive polarity voltage that adds between discharge electrode identical, make first loop of power circuit between discharge electrode, provide the energy of positive and negative two polar orientation identical, guarantee that like this each pulse discharge corrosion pit is even; Reduce the processing work surface roughness effectively, improved workpiece surface quality.

Second loop of power circuit in the technical scheme of the present invention, its capacity usage ratio is high.Because do not have resistance in second loop of power circuit, the energy that power supply provides has all been supplied with discharging gap basically, has improved capacity usage ratio greatly, and edm speed.

The present invention is through in unidirectional wire cutting machine roughing process; When discharge gap voltage is unloaded; When both not having disruptive discharge between processing work and the wire electrode; Between processing work and wire electrode, add the fixed cycle just/guide of negative two polarity alternations punctures detection voltage, makes and forms alternating current between the discharging gap, suppresses electrolytic effect.Because just/guide of negative two polarity alternations punctures detection voltage, all has guide's breakdown effects, can guide multiple discharge processing on this polarity between processing work and the wire electrode; When processing on this polarity reaches certain setting threshold values total discharge time; System punctures detection voltage with the guide between processing work and the wire electrode automatically, is transformed into opposite polarity, multiple discharge processing on opposite polarity between guiding processing work and the wire electrode; Make the gap voltage between processing work and the wire electrode just be in/bear two polarity alternation states all the time; The gap average voltage is tending towards 0 volt, in the aqueous medium just/anion is in not mobile status, prevents electrolytic etching.

In the unidirectional wire cutting machine fine finishining process, between processing work and wire electrode, add the fixed cycle just/pulse voltage of negative two polarity alternations, make and form alternating current between the discharging gap, suppress the electrolytic effect in the fine finishining process; Because fine finishining discharge power loop middle impedance; Just/just the same on negative two polarity discharge loops; And just/bear and use identical dc source on two polarity discharge power loops; Processing electric current value in positive and negative two polar orientation of processing interpolar is just the same, effectively improves workpiece surface quality.

Adopt the electrical discharge pulse power source of alternating polarity; High-frequency impulse discharge power supply between processing work and the wire electrode is in tens microsecond cycle times to hundreds of microsecond cycle time; Periodically alternating discharge is processed polarity, and the average voltage between edm the two poles of the earth is zero, can not form the required electric field of electrolysis; Make produce in the processing just/anion is basically as you were; Just/anion can not pour into the processing work of Variable Polarity, solved the softening metamorphic layer problem of processing work, effectively improved the surface quality of processing work.

Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.

Though the embodiment that the present invention disclosed as above, the embodiment that described content just adopts for the ease of understanding the present invention is not in order to limit the present invention.Technical staff under any the present invention in the technical field; Under the prerequisite of spirit that does not break away from the present invention and disclosed and scope; Can do any modification and variation what implement in form and on the details; But scope of patent protection of the present invention still must be as the criterion with the scope that appending claims was defined.

Claims

1. an alternating polarity pulse power is used for the numerical control electrical process machine and through wire electrode processing work is processed, and it is characterized in that, this pulse power comprises the main loop that shakes, drives loop, loop of power circuit, detection loop and feedback circuit, wherein:

Said feedback circuit links to each other with said detection loop and the main loop that shakes, and is used for producing said feedback signal according to said processing detection signal;

Wherein, said loop of power circuit comprises first loop of power circuit and second loop of power circuit, wherein:

Said second loop of power circuit links to each other with said driving loop, wire electrode and processing work, and being used for driving signal according to said second provides said high-voltage great-current spark discharge energy;

Said first loop of power circuit comprises first power supply, first metal-oxide-semiconductor, second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and at least one current-limiting resistance, wherein:

Wherein, the said first driving signal comprises said first control signal, second control signal, the 3rd control signal and the 4th control signal; Said first metal-oxide-semiconductor, second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor be alternation machining voltage polarity under the effect of said first control signal, second control signal, the 3rd control signal and the 4th control signal respectively;

Said second loop of power circuit comprises that second source and electric current provide circuit, wherein:

Electric current provides circuit, connects the anodal and said processing work of said second source, is used for driving under the signal effect said second, to said discharging gap high-voltage great-current spark discharge energy is provided;

Said electric current provides the diode and the power MOS pipe of quantity such as circuit comprises, a diode is formed one with a power MOS pipe and is connected string, and be used to said discharging gap peak point current is provided, in each said connection string:

2. the pulse power as claimed in claim 1 is characterized in that, said feedback circuit comprises unloaded treatment circuit, short circuit treatment circuit and regular picture treatment circuit, wherein:

3. the pulse power as claimed in claim 2 is characterized in that:

Said detection loop does not detect said discharging gap in the work period of said benchmark discharge pulse signal breakdown, and then said discharge condition is unloaded discharge condition, exports said gap voltage airborne signals;

4. the pulse power as claimed in claim 2 is characterized in that:

The said short circuit feedback signal that said short circuit treatment circuit produces comprises that discharge pulse width setup value and discharge pulse under the short circuit dischange state rests setting value;

5. the pulse power as claimed in claim 4 is characterized in that:

The said regular picture feedback signal that said regular picture treatment circuit produces comprises that discharge pulse width setup value and discharge pulse under the regular picture state rests setting value.