CN102114559A

CN102114559A - Alternating polarity pulsed power supply

Info

Publication number: CN102114559A
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: 2011-07-06
Anticipated expiration: 2030-01-05
Also published as: CN102114559B

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 comes the ablation 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 by 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.

Have in the prior art a kind of be used to discharge shape the bipolar pulse power supply that lathe uses, it is according to the electro discharge machining gapping place state, under discharge pulse rests state, between the two poles of the earth of discharge processing, by with the voltage of normal process polarity opposite polarity, make discharge processing 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 has 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 when 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 seldom produces, 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 by 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 described master loop that shakes is used to produce the benchmark discharge pulse signal, and adjusts described benchmark discharge pulse signal according to feedback signal;

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

Described loop of power circuit, link to each other with described driving loop, wire electrode and processing work, being used for driving signal according to described first provides the guide to puncture the discharge machining voltage that detects in voltage and the fine finishining process in the roughing process for the discharging gap of described wire electrode and processing work, drives signal according to described second and provides high-voltage great-current spark discharge energy at described discharging gap;

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

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

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

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

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

Preferably, described 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 described guide to puncture and detects voltage and described discharge machining voltage;

Described first metal-oxide-semiconductor, drain electrode are by current-limiting resistance or directly connect the positive pole of described first power supply, and source electrode is by current-limiting resistance or directly connect described processing work, and grid inserts first control signal;

Described second metal-oxide-semiconductor, drain electrode are by current-limiting resistance or directly connect the positive pole of described first power supply, and source electrode is by current-limiting resistance or directly connect described wire electrode, and grid inserts second control signal;

Described the 3rd metal-oxide-semiconductor, drain electrode is by current-limiting resistance or directly connect described wire electrode, and source electrode is by current-limiting resistance or directly connect the negative pole of described first power supply, and grid inserts the 3rd control signal;

Described the 4th metal-oxide-semiconductor, drain electrode is by current-limiting resistance or directly connect described processing work, and source electrode is by current-limiting resistance or directly connect the negative pole of described first power supply, and grid inserts the 4th control signal;

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

Wherein, the described first driving signal comprises described first control signal, second control signal, the 3rd control signal and the 4th control signal; Described 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 described first control signal, second control signal, the 3rd control signal and the 4th control signal respectively.

Preferably, described 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 discharge machining energy in described roughing process, and the described electric current of anodal connection provides circuit, and negative pole connects described wire electrode;

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

Preferably, described 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, is used to described discharging gap that peak point current is provided, in each described connection string:

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

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

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

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

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

Described regular picture treatment circuit links to each other with described 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 described second loop of power circuit output be beneficial to the discharge energy that improves working (machining) efficiency;

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

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

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

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

Wherein, discharge pulse width under described short circuit dischange state setting value is less than the setting value of the discharge pulse width the regular picture state under, and the discharge pulse under the described short circuit dischange state rests to set value greater than the discharge pulse under the regular picture state and rests setting value.

Preferably, the described regular picture feedback signal that described regular picture treatment circuit produces comprises that the discharge pulse width regular picture state under sets value and discharge pulse 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 solution 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 the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in specification, claims and accompanying drawing.

Description of drawings

Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, 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 schematic diagram of first loop of power circuit under the effect of gap voltage airborne signals;

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

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

The specific embodiment

Describe embodiments of the present invention in detail below with reference to drawings and Examples, how the application technology means solve technical problem to the present invention whereby, and the implementation procedure of reaching technique effect can fully understand and implements 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, driving loop 220, first loop of power circuit 230, second loop of power circuit 240, detects 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, send 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, 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 link to each other, be used in this roughing of real time on-line monitoring and the fine finishining process electro discharge machining gapping place unloaded, three kinds of discharge conditions such as short circuit and regular picture, and produce the gap voltage airborne signals respectively according to concrete discharge condition, short-circuit signal or regular picture signal, send to unloaded treatment circuit 260 respectively, (the gap voltage airborne signals sends to unloaded treatment circuit 260 for short circuit treatment circuit 270 and regular picture treatment circuit 280, 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 (as 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 setting value of the discharge pulse width under short circuit dischange state T _On1And discharge pulse rest the setting value T _Off1Send to the main loop 210 that shakes together, so that the smaller discharge energy of second loop of power circuit, 240 outputs helps the stability of discharging and processing; Wherein this short circuit feedback signal comprises discharge pulse width setting value T _On1And discharge pulse rest the setting value T _Off1, this discharge pulse width setting value T _On1Less than the setting value of the discharge pulse width under regular picture state T _On2, this discharge pulse rests and sets value T _Off1Greater than the discharge pulse under the regular picture state rest the setting value T _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 setting value of the discharge pulse width under regular picture state T _On2With discharge pulse rest the setting value T _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 discharge processing.

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.This loop of power circuit 290 provides the guide to puncture detection voltage according to this first driving signal discharging gap for this wire electrode and processing work in the roughing process, provides high-voltage great-current spark discharge energy according to this second driving signal at this discharging gap.

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, this the first driving signal that wherein drives loop 220 transmissions comprises 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 discharge machining 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, and second end 2 connects wire electrode 291.

In technical solution 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 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 not 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 of current-limiting resistance R41 connects workpiece 292, the second ends 2 and connects the source electrode of the first metal-oxide-semiconductor T1 and the drain electrode of the 4th metal-oxide-semiconductor T4; The drain electrode of the source electrode of the second metal-oxide-semiconductor T2 and the 3rd metal-oxide-semiconductor T3 directly connects wire electrode 291.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 herein.

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 herein.

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 the 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 the wire electrode 291 of the 3rd current-limiting resistance R63; First end 1 of the 3rd current-limiting resistance R63 connects second end 2 of the wire electrode 291 and the second current-limiting resistance R62; First end 1 of the 4th current-limiting resistance R64 connects second end 2 that workpiece 292, the second ends 2 connect 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 herein.

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 the 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 the wire electrode 291 of the 3rd current-limiting resistance R67, and grid inserts the second control signal P2; First end 1 of the 3rd current-limiting resistance R67 connects the source electrode of the wire electrode 291 and the second metal-oxide-semiconductor T3, and 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 of the 4th current-limiting resistance R68 connects the source electrode of the workpiece 292 and the first metal-oxide-semiconductor T1, and 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 herein.

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 of the 3rd metal-oxide-semiconductor T3 connects wire electrode 291, and source electrode connects the negative pole of the first power supply E1, and the drain electrode of the 4th metal-oxide-semiconductor T4 connects workpiece 292, and 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 herein.

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 of the 3rd metal-oxide-semiconductor T3 connects wire electrode 291, and source electrode connects the negative pole of the first power supply E1, and the drain electrode of the 4th metal-oxide-semiconductor T4 connects workpiece 292, and 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 herein.

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 connection workpiece 292, the second metal-oxide-semiconductor T2 connects the positive pole of the first power supply E1, and source electrode connects wire electrode 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 herein.

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 discharge processing energy needed under the roughing pattern; The anodal electric current that connects provides circuit 910, and negative pole connects wire electrode 291;

Electric current provides circuit 910, connect second source E2 and workpiece 292, under second driving signal (illustrating with P5 among the figure) effect that drives loop 220 transmissions, 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 that example illustrates that this electric current provides the structure of 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, and source electrode connects workpiece 292, and 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, and source electrode connects workpiece 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 herein.The connection string of a plurality of diodes and power MOS pipe can be used for providing bigger peak point current to discharging gap.

Figure 10 is the operation principle schematic diagram 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 are low level, 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 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, the second control signal P2 and the 4th control signal P4 become high level, 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, at t3 constantly, 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, machining voltage is loaded on wire electrode 291 and the workpiece 292, and 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 schematic diagram 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, the second control signal P2 and the 4th control signal P4 are low level, 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.

After period, the discharge pulse width under the regular picture state is set value T through t12 _On2With discharge pulse rest the setting value T _Off2Send to the main loop 210 that shakes together; The main loop 210 that shakes is according to discharge pulse width setting 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.

Discharge pulse rests and sets value T under the process 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, once more little energy guide are punctured detection voltage 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.After period, the discharge pulse width under the short circuit dischange state sets value T through t20 _On1With pulse rest the setting value T _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, the second metal-oxide-semiconductor T2 and the 4th metal-oxide-semiconductor T4 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 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 transferring electric machining 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 by 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 schematic diagram 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, by 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 by 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, machining voltage is 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, 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, first metal-oxide-semiconductor T1 in first loop of power circuit 230 and the 3rd metal-oxide-semiconductor T3 turn-off, 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 discharge machining energy condition, the surface smoothness of processing work is improved.

Technical solution 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 discharge processing.

In the technical solution 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 solution of the present invention, interpolar continues under the high-voltage great-current discharge condition, has avoided transferring a fixed polarity mode for a long time the function of electric machining.High-voltage great-current discharge processing continuously, when puncturing the polarity that detects voltage and remain unchanged for a long time as the guide, referring to Figure 11, the first metal-oxide-semiconductor T1, the 3rd metal-oxide-semiconductor T3 power tube batch (-type) conducting, at t11, t15, the t19 time period provides the negative polarity guide to puncture detection voltage to interpolar, 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, shake the loop with the first metal-oxide-semiconductor T1 in first loop of power circuit by main, the 3rd metal-oxide-semiconductor T3 power tube becomes and ends, the second metal-oxide-semiconductor T2, the 4th metal-oxide-semiconductor T4 power tube conducting makes next guide puncture detection voltage and just changes over the positive polarity processing mode.Realized 0 volt of interpolar machining gap voltage convergence, avoided transferring electric machining a fixed polarity mode for a long time, thereby cause the generation of electrolysis phenomenon.

The short circuit pulse that technical solution 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, as T _d＞T _D0, then judge to be the regular picture state between discharge electrode.Pulse T under the regular picture state _On2Value makes the second second driving signal P5 that drives the loop export 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 the second second driving signal P5 that drives the loop export 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 short circuit when having avoided high-voltage great-current is discharged for a long time and is processed the fracture of wire that is caused.

Technical solution 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 produce alternation automatically 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 solution of the present invention.As seen from Figure 3, first loop of power circuit is a kind of typical bridge circuit, under positive polarity processing or negative polarity processing mode, the impedance of first loop of power circuit and dc source are duplicate, as the first metal-oxide-semiconductor T1, the 3rd metal-oxide-semiconductor T3 power switch pipe conducting, the second metal-oxide-semiconductor T2, when the 4th metal-oxide-semiconductor T4 power switch pipe ends, 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, first loop of power circuit is just being provided between discharge electrode, the energy of negative two polar orientation is 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 solution of the present invention, its capacity usage ratio height.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 the discharge process velocity.

The present invention is by 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, make and form alternating current between the discharging gap, suppress electrolytic effect.Because just/guide of negative two polarity alternations punctures detection voltage, all has guide's breakdown effects, multiple discharge processing on this polarity between bootable 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, be 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 tens microsecond cycle times to hundreds of microsecond in cycle time, periodically alternating discharge is processed polarity, average voltage between discharge processing 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 substantially as you were, just/anion can not pour into the processing work of Variable Polarity, solve the softening metamorphic layer problem of processing work, effectively improved the surface quality of processing work.

Obviously, those skilled in the art should be understood 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, they can be stored in the storage device and carry out by calculation element, 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.Like this, the present invention is not restricted to any specific hardware and software combination.

Though the disclosed embodiment of the present invention 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 in any the technical field of the invention; under the prerequisite that does not break away from the disclosed spirit and scope of the present invention; 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 by 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:

2. the pulse power as claimed in claim 1 is characterized in that, described loop of power circuit comprises first loop of power circuit and second loop of power circuit, wherein:

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

4. the pulse power as claimed in claim 2 is characterized in that, described second loop of power circuit comprises that second source and electric current provide circuit, wherein:

5. the pulse power as claimed in claim 4, it is characterized in that described 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, be used to described discharging gap that peak point current is provided, in each described connection string:

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

7. the pulse power as claimed in claim 6 is characterized in that:

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

8. the pulse power as claimed in claim 6 is characterized in that:

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

9. the pulse power as claimed in claim 8 is characterized in that:

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