CN100528441C - Electric spark machine - Google Patents
Electric spark machine Download PDFInfo
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- CN100528441C CN100528441C CNB2007100740557A CN200710074055A CN100528441C CN 100528441 C CN100528441 C CN 100528441C CN B2007100740557 A CNB2007100740557 A CN B2007100740557A CN 200710074055 A CN200710074055 A CN 200710074055A CN 100528441 C CN100528441 C CN 100528441C
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- power supply
- constant current
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Abstract
An electric spark machine has reduced power consumption and saved use cost since a constant current source is used. The adopted technical proposal is in that: the electric spark machine includes a mechanical system, a servo system and a power supply circuit, wherein the mechanical system is used to process the workpiece driven by the servo system, a power input end of the servo system connects with the power supply circuit. The power supply circuit is high voltage constant current source and low voltage constant current source.
Description
Affiliated technical field
The present invention relates to the electric discharge machine technology, particularly a kind of its variable frequency power source partly is the electric discharge machine of constant-current supply.
Background technology
Electric discharge machine three big parts are formed: mechanical system, servo-drive system, high frequency electric source are a kind of special process equipment that comes processing metal by spark discharge.It has three big processed edges: " using a soft approach to subdue a tough opponent " " stereocopy " " little power processing ", therefore, spark machined is one of topmost manufacturing process of mould industry.
Fig. 1 is a spark machined principle schematic in existing the telling about, Z axle 3 drives electrode 1 and does upper and lower motion under the driving of servomotor 2 in the drawings, Z axle 3 moves upward or moves downward the gap voltage that produces when depending on electrode 1 with workpiece 4 discharges, when electrode 1 and workpiece 4 excesssive gaps, gap voltage rising Z axle 3 moves downward, otherwise Z axle 3 moves upward.Go round and begin again, make to keep a rational gap between electrode 1 and the workpiece 4, to guarantee the stable of discharge processing.Dc source divides high pressure 300V and low pressure 80V, and the function of high pressure is disruptive discharge passage or the processing of little electric current, and little of electric current provides 5% electric energy, the function of low pressure: be big electric current processing, 95% electric energy is provided.The HF switch function is to allow the state that keeps spark discharge between electrode and the workpiece, and its pulse width and interval width have determined the surface roughness and the electrode wear rate of workpiece to be machined.
Gap between electrode 1 and the workpiece 4 is added by mineral oil and is filled, spark discharge adds a large amount of metal particle that produces man-hour and will discharge from have only several mm clearance of percentage, initiation electrode that these electric conductivity good metal particulates are regular and the partial short-circuit between the workpiece increase processing electric current rapidly.If processing electric current is not added restriction, the be bound to finished surface of defective work piece and the safety that jeopardizes the HF switch pipe therefore at height, have increased current-limiting resistance R1 and R2 with the restriction processing electric current in the low tension loop.
Increased current-limiting resistance R1, R2 has solved the problem of short circuit current, but following deficiency is arranged:
1, waste energy, the voltage drop U1 at R1 two ends and electrode are the dividing potential drop relations of connecting with the gap voltage U2 of workpiece.
When big electric current adds man-hour, U2 is 50V, and U1 is 30V, and the R1 power consumption accounts for 37.5%.
When little electric current adds man-hour, U2 is 30V, and U1 is 50V, and the R1 power consumption accounts for 62.5%.
The average power consumption of R1 is 50%.
Same reason, in high tension loop, the average power consumption of current-limiting resistance R2 is 50%, therefore in the electric discharge machine course of work, the energy that half is arranged is by current-limiting resistance R1, R2 heating loss.
2, increase the complexity of equipment, change the processing electric current of workpiece, the resistance value of current-limiting resistance only changes, current-limiting resistance usually is a resistance box in the prior art, by changing switch combination in the resistance box to reach the size that changes current-limiting resistance and the discharge current between electrode and the workpiece of flowing through.And resistance box is bulky, resistance box has occupied the space of electric discharge machine switch board 1/3 in existing the telling about, simultaneously, the outside powerful air draft of several desk fans is housed in resistance box, has further increased energy consumption with heat radiation in order not allow the operate as normal of other system of heat effects that resistance box produces.In addition, the large power supply transformer of electric discharge machine adds the man-hour power factor less than 0.5 at little electric current.
Summary of the invention:
The present invention is in order to overcome in the prior art, owing to the deficiency that exists current-limiting resistance to bring, invent a kind of electric discharge machine that uses constant-current supply, in power circuit, do not need to increase current-limiting resistance, save the energy consumption of bringing owing to current-limiting resistance, reduce the complexity of equipment simultaneously.
The technical scheme that the present invention adopts in order to realize its technical purpose is: a kind of electric discharge machine; comprise: mechanical system; electrode; servo-drive system and high-frequency power supply circuit; mechanical system is being processed workpiece by adjusting the discharge current between electrode and the workpiece to be processed under the drive of servo-drive system; high-frequency power supply circuit is connected between workpiece and the electrode; for discharge between workpiece and the electrode provides suitable voltage and current; described high-frequency power supply circuit comprises low pressure constant current switch power supply; the high voltage and constant current Switching Power Supply; high-frequency signal circuit and HF switch; the positive source of low pressure constant current switch power supply and high voltage and constant current Switching Power Supply connects described electrode respectively; isolate mutually between low pressure constant current switch power supply and the high voltage and constant current Switching Power Supply; HF switch be connected in workpiece and low pressure constant current switch power supply and high voltage and constant current Switching Power Supply jointly between; its switch termination high-frequency signal circuit; under the control of high-frequency signal circuit, high-frequency power supply circuit is carried out overcurrent protection; voltage between electrode and workpiece disconnects HF switch during less than 20V.High-frequency signal circuit is by producing the control signal to HF switch to the detection of voltage between electrode and the workpiece.
A diode is respectively arranged in described low pressure constant current switch power supply and the high voltage and constant current Switching Power Supply, and diode cathode connects low pressure constant current switch power supply and high voltage and constant current Switching Power Supply output, negative pole receiving electrode respectively.
Described low pressure constant-current supply and high voltage and constant current Switching Power Supply are together the circuit structure that is made of one-level rectification circuit, frequency conversion electric bridge, transformer, secondary rectification circuit;
The input termination civil power of one-level rectification circuit, the input of output termination frequency conversion electric bridge becomes direct current with the commercial power rectification;
Frequency changer circuit comprises electric bridge and the control IC that is made up of triode V1, V2, V3, V4, wherein triode V1 and V3 in the electric bridge, V2 and V4 are series at the output of one-level rectification circuit respectively, at triode V1 and V3, the primary coil of series transformer between V2 and the V4, wherein when triode V1 during with the V3 conducting during with V2 and V4 conducting electric current sense of current in transformer different, control IC connects the base stage of triode V1, V2, V3, V4 respectively, the switching of control triode is transformed into high-frequency alternating current with direct current;
The primary coil of transformer connects the output of frequency conversion electric bridge, and three taps of secondary coil connect the secondary rectification circuit respectively;
The secondary rectification circuit comprises commutation diode D1 and D2, commutation capacitor C, the P utmost point of commutation diode D1 and D2 connects two tap of transformer secondary output coil respectively, N output extremely in parallel, the centre tap of transformer secondary output coil is output ground, and commutation capacitor C cross-over connection HF switch between output and ground can be a triode, and emitter and collector is connected to respectively between the ground of workpiece and high frequency electric source, base stage connects described high-frequency signal circuit, accepts the control of high-frequency signal circuit.
The present invention has cancelled current-limiting resistance owing to used constant-current supply in circuit, therefore reduced the loss of electric energy, has reduced the volume of equipment simultaneously.
Description of drawings
With embodiment the course of work of the present invention is described with reference to the accompanying drawings below.
Electric discharge machine fundamental diagram in Fig. 1 prior art.
Fig. 2 electric discharge machine schematic diagram of the present invention.
Fig. 3 high-voltage constant-current power supply of the present invention and the output of low pressure constant-current supply is circuit diagram partly.
Among the figure: 1 electrode, 2 servomotors, 3Z axle, 4 workpiece, 5 HF switches, 6 high voltage and constant current Switching Power Supplies, 7 low pressure constant current switch power supplys, 8 high-frequency signal circuits.
The specific embodiment
Among Fig. 2, a kind of electric discharge machine, comprise mechanical system, electrode 1, servo-drive system and high-frequency power supply circuit, drive electrode 1 under the driving of the servomotor 2 of the Z axle 3 in the mechanical system in servo-drive system and do upper and lower motion, Z axle 3 moves upward or moves downward the gap voltage that produces when depending on electrode 1 with workpiece 4 discharges, when electrode 1 and workpiece 4 excesssive gaps, gap voltage rising Z axle 3 moves downward; Otherwise Z axle 3 moves upward.Go round and begin again, make to keep a rational gap between electrode 1 and the workpiece 4, to guarantee the stable of discharge processing.High-frequency power supply circuit is connected between workpiece 4 and the electrode 1; for discharge between workpiece 4 and the electrode 1 provides suitable voltage and current; described high-frequency power supply circuit comprises low pressure constant current switch power supply 7; high voltage and constant current Switching Power Supply 6; high-frequency signal circuit 8 and HF switch 5; the positive source of low pressure constant current switch power supply 7 and high voltage and constant current Switching Power Supply 6 connects described electrode 1 respectively; utilize two diodes to isolate mutually between low pressure constant current switch power supply 7 and the high voltage and constant current Switching Power Supply 6; one of them diode cathode connects the output of low pressure constant current switch power supply 7; negative pole receiving electrode 1; another diode cathode connects the output of high voltage and constant current Switching Power Supply 6; negative pole receiving electrode 1; HF switch 5 be connected in workpiece 4 and low pressure constant current switch power supply 7 and high voltage and constant current Switching Power Supply 6 jointly between; its switch termination high-frequency signal circuit 8; under the control of high-frequency signal circuit 8, high-frequency power supply circuit is carried out overcurrent protection; voltage between electrode 1 and workpiece 4 disconnects HF switch 5 during less than 20V.
Among Fig. 3, low pressure constant current switch power supply 7 and high voltage and constant current Switching Power Supply 6 are the same circuits structure, and this circuit structure comprises: one-level rectification circuit, frequency conversion electric bridge, transformer and secondary rectification circuit;
The input termination civil power of one-level rectification circuit, the input of output termination frequency conversion electric bridge becomes direct current with the commercial power rectification;
Frequency changer circuit comprises electric bridge and the control IC that is made up of triode V1, V2, V3, V4, wherein triode V1 and V3 in the electric bridge, V2 and V4 are series at the output of one-level rectification circuit respectively, at triode V1 and V3, the primary coil of series transformer between V2 and the V4, wherein when triode V1 during with the V3 conducting during with V2 and V4 conducting electric current sense of current in transformer different, control IC connects the base stage of triode V1, V2, V3, V4 respectively, the switching of control triode is transformed into high-frequency alternating current with direct current;
The primary coil of transformer connects the output of frequency conversion electric bridge, and three taps of secondary coil connect the secondary rectification circuit respectively;
The secondary rectification circuit comprises commutation diode D1 and D2, commutation capacitor C, the P utmost point of commutation diode D1 and D2 connects two tap of transformer secondary output coil respectively, N output extremely in parallel, the centre tap of transformer secondary output coil is output ground, and commutation capacitor C cross-over connection is between output and ground.
The course of work of the present invention is as follows:
In Fig. 3, triode V1, V3 and V2, V4 is alternate conduction under the driving of IC, the frequency of alternate conduction is 1000KHz under the driving of IC, makes transformer primary coil generation alternating current sense secondary winding and exports after full-wave rectification, because switching frequency height (100Kf
H) even if the capacity of filter condenser C is little, also can obtain good ripple coefficient.
We can regard the discharge channel of spark machine electrode as a variable resistor R, and when R diminishes, output current increases, this moment, IC can change the dutycycle of drive waveforms, reduced pulse width (frequency is constant), and output voltage U o descends, output current is reduced, otherwise electric current output is gone up.
Here have 2: 10 important:
1 because the effect of capacitor C, and the adjusting of output voltage U o is level and smooth transition, can not produce " cutting effect " to the high frequency waveforms of electric discharge machine.
In 2 constant-current sources, IC switching frequency (μ S level) is higher than the frequency (mS level) of electric discharge machine high frequency far away, and in the power supply, the adjusting of the dutycycle of triode ON time just changes the envelope of electric discharge machine high frequency, can not change its pulse width and interval width.
Among Fig. 2; we replace the low-pressure section of former dc source with the high-power constant-current supply 7 of low pressure (50V, 50A); the high-pressure section that replaces former dc source with high pressure (300V, 5A) constant-current supply 6; in high-frequency signal circuit 8, increased excess current protective function; when processing produces overcurrent; be the gap voltage＜20V between electrode and the workpiece, HF switch pipe 5 can automatic cut-off.
Claims (3)
1. electric discharge machine; comprise mechanical system; electrode; servo-drive system and high-frequency power supply circuit; mechanical system is being processed workpiece by adjusting the discharge current between electrode and the workpiece to be processed under the drive of servo-drive system; high-frequency power supply circuit is connected between workpiece and the electrode; for discharge between workpiece and the electrode provides suitable voltage and current; it is characterized in that: described high-frequency power supply circuit comprises: low pressure constant current switch power supply (7); high voltage and constant current Switching Power Supply (6); high-frequency signal circuit (8) and HF switch (5); the positive source of low pressure constant current switch power supply (7) and high voltage and constant current Switching Power Supply (6) connects described electrode (1) respectively; isolate mutually between low pressure constant current switch power supply (7) and the high voltage and constant current Switching Power Supply (6); HF switch (5) be connected in workpiece (4) and low pressure constant current switch power supply (7) and high voltage and constant current Switching Power Supply (6) jointly between; its switch termination high-frequency signal circuit (8); under the control of high-frequency signal circuit (8); high-frequency power supply circuit is carried out overcurrent protection; voltage between electrode (1) and workpiece (4) is during less than 20V; HF switch (5) is disconnected, and high-frequency signal circuit (8) is by determining to produce the control signal to HF switch (5) to voltage detecting between electrode (1) and the workpiece (4).
2. a kind of electric discharge machine according to claim 1 is characterized in that: described low pressure constant current switch power supply (7) and high voltage and constant current Switching Power Supply (6) are together the circuit structure that is made of one-level rectification circuit, frequency conversion electric bridge, transformer, secondary rectification circuit;
The input termination civil power of one-level rectification circuit, the input of output termination frequency conversion electric bridge becomes direct current with the commercial power rectification;
Frequency changer circuit comprises electric bridge and the control IC that is made up of triode V1, V2, V3, V4, wherein triode V1 and V3 in the electric bridge, V2 and V4 are series at the output of one-level rectification circuit respectively, at triode V1 and V3, the primary coil of series transformer between V2 and the V4, wherein when triode V1 during with the V3 conducting during with V2 and V4 conducting electric current sense of current in transformer different, control IC connects the base stage of triode V1, V2, V3, V4 respectively, the switching of control triode is transformed into high-frequency alternating current with direct current;
The primary coil of transformer connects the output of frequency changer circuit, and three taps of secondary coil connect the secondary rectification circuit respectively;
The secondary rectification circuit comprises commutation diode D1 and D2, commutation capacitor C, the P utmost point of commutation diode D1 and D2 connects two tap of transformer secondary output coil respectively, N output extremely in parallel, the centre tap of transformer secondary output coil is output ground, and commutation capacitor C cross-over connection is between output and ground.
3. a kind of electric discharge machine according to claim 1, it is characterized in that: in described low pressure constant current switch power supply (7) and the high voltage and constant current Switching Power Supply (6) diode is arranged respectively, two diode cathodes connect the output of low pressure constant current switch power supply (7) and high voltage and constant current Switching Power Supply (6) respectively, and negative pole connects described electrode (1).
4 a kind of electric discharge machines according to claim 1, it is characterized in that: described HF switch (5) is a triode, its emitter and collector is connected to respectively between the ground of workpiece (4) and high voltage and constant current Switching Power Supply (6), and base stage connects described high-frequency signal circuit (8).
5 a kind of electric discharge machines according to claim 2 is characterized in that: described low pressure constant current switch power supply (7) is the constant-current source of 50V, 50A, and described high voltage and constant current Switching Power Supply (6) is the constant-current source of 300V, 5A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100740557A CN100528441C (en) | 2007-04-17 | 2007-04-17 | Electric spark machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100740557A CN100528441C (en) | 2007-04-17 | 2007-04-17 | Electric spark machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101053918A CN101053918A (en) | 2007-10-17 |
| CN100528441C true CN100528441C (en) | 2009-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100740557A Expired - Fee Related CN100528441C (en) | 2007-04-17 | 2007-04-17 | Electric spark machine |
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| CN (1) | CN100528441C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767229B (en) * | 2008-12-30 | 2012-04-25 | 财团法人工业技术研究院 | Energy-saving discharge power supply of electrical discharge machining machine |
| CN104959689A (en) * | 2015-06-01 | 2015-10-07 | 苏州市宝玛数控设备有限公司 | Overcurrent protective device for wire cut electrical discharge machining (WEDM) machine tool pulse power supply |
| CN114043020B (en) * | 2021-12-17 | 2022-08-19 | 山东豪迈机械科技股份有限公司 | Circuit for removing electric spark machining gap electric erosion product and control method thereof |
| CN114603221B (en) * | 2022-04-19 | 2023-09-26 | 中国航发动力股份有限公司 | Electric spark power supply device for repairing honeycomb part hole plugging and testing method |
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2007
- 2007-04-17 CN CNB2007100740557A patent/CN100528441C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN101053918A (en) | 2007-10-17 |
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Granted publication date: 20090819 Termination date: 20120417 |