CN103624344A - Control system of electric discharge machining unit - Google Patents
Control system of electric discharge machining unit Download PDFInfo
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- CN103624344A CN103624344A CN201310686209.3A CN201310686209A CN103624344A CN 103624344 A CN103624344 A CN 103624344A CN 201310686209 A CN201310686209 A CN 201310686209A CN 103624344 A CN103624344 A CN 103624344A
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Abstract
The invention discloses a control system of an electric discharge machining unit. The control system comprises a power supply, a servo system, a breakdown power supply, an electrode wire, a control unit, a controllable switch, a discharge breakdown detection and a workpiece, wherein after discharge breakdown, an equivalent resistance of a gap between the electrode wire and the workpiece is reduced so that a larger current flows in a discharge gap, thus through detecting the change of the current of the discharge gap, when the discharge breakdown detects that the current in the circuit changes, the change is fed back to the control unit, the control unit controls the uncontrollable switch to be switched off; meanwhile, the change is fed back to the servo system, the servo system drives the electrode wire to rotate, thus a one-time cyclic work is completed. The control system has the beneficial effects of controlling the discharge duration time, ensuring that a certain time is delayed after one-time discharge is ended, avoiding that multiple pulses in a shorter pulse width are too late to discharge or discharge of extremely short time is only generated, increasing the effective pulse utilization rate of a pulse power supply, and increasing the processing efficiency, which are obtained through the technical means. Meanwhile, the conditions of broken electrode wire and the like caused by discharge breakdown are prevented.
Description
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Technical field
The present invention relates to electric discharge machining apparatus, particularly a kind of electric discharge machining apparatus control system.
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Background technology
Spark machined is not subject to the advantages such as workpiece hardness restriction, the significant cutting force of nothing owing to having processing, at aspects such as mould manufacture, superhard material processing, is used widely, and has become a kind of important manufacturing process of mechanical manufacturing field.The processing of electric spark milling based on line electrode is owing to adopting line electrode to process, in order to guarantee not fracture of wire, must Limited Pulses width so that in the scope that maximum impulse discharge energy can bear at wire electrode.Yet, spark discharge in spark machined has larger randomness, in shorter pulsewidth, a lot of pulses all have little time electric discharge and maybe can only produce the electric discharge of utmost point short time, the effective impulse utilization rate of the pulse power is greatly reduced, thereby working (machining) efficiency is affected.Along with the requirement of spark machined precision is more and more higher, improving spark machined precision can realize by electrode and by numerical control programming, also can realize from circuit, circuit realization is at present based on PWM pulse-width modulation circuit servo-drive system, improve the control to servomotor, but it is limited that simple PWM pulse-width modulation circuit servo-drive system improves machining accuracy, and motor moves the more reliable and stable assurance that is difficult to.
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Summary of the invention
For solving the problem of above-mentioned existence, the invention provides a kind of electric discharge machining apparatus control system, this system can not only effectively overcome in edm process, and in shorter pulsewidth, a lot of pulses all have little time electric discharge and maybe can only produce the electric discharge of utmost point short time, and the processing causing is influenced.And can make that servomotor in servo-drive system operates steadily, accurate positioning, meet modern processing request.
A kind of electric discharge machining apparatus control system, comprise power supply, servo-drive system, puncture power supply, wire electrode and workpiece, described power supply provides servo-drive system required power supply by cable, the described power supply that punctures provides wire electrode and the required power supply that punctures of workpiece by cable, servo-drive system and wire electrode are integrated and drive wire electrode motion, also comprise that control module, gate-controlled switch and discharge breakdown detect, described control module by circuit with puncture power supply, servo-drive system, gate-controlled switch and discharge breakdown detection and be connected respectively; The equivalent resistance that punctures post gap when wire electrode and workpiece electrical discharge reduces, making has larger electric current to flow through in discharging gap, so by detecting the curent change of discharging gap, when discharge breakdown detects in circuit curent change, feed back to control module, control module is controlled gate-controlled switch and is disconnected, and feeds back to servo-drive system simultaneously, servo-drive system drives wire electrode revolution, completes cycling one time.When the discharge cycle time of setting then, it is closed that control module is controlled gate-controlled switch, discharge breakdown circuit working, servo-drive system controllable signal is provided simultaneously, servo-drive system drives wire electrode running work, and system enters next cycling, has has so come and gone whole workpiece processing work.
The beneficial effect of obtaining by this technological means is according to the signal of discharge breakdown testing circuit output, the length of controlled discharge duration, and guarantee to rest the regular hour (being the pulse spacing) after finishing in electric discharge once, avoid in shorter pulsewidth a lot of pulses all to have little time electric discharge and maybe can only produce the electric discharge of utmost point short time, the effective impulse utilization rate that has improved the pulse power, has improved working (machining) efficiency.And the situations such as wire electrode fracture of wire that discharge breakdown causes have been prevented.
For making servo-drive system make that motor operates steadily, accurate positioning, the present invention is based on PWM pulse-width modulation circuit servo-drive system, further improved the control circuit of servo-drive system, this circuit comprises servomotor, 4 switches and 2 negative-feedbacks, 4 switches and 2 negative-feedbacks form 2 groups of switches break-make simultaneously, make the rapid lifting of motor; 2 negative-feedbacks play negative feedback, by the processing of circuit, make that motor operates steadily, accurate positioning.
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Accompanying drawing explanation
Fig. 1 is control logic theory diagram of the present invention;
Fig. 2 is PWM servo-drive system of the present invention loop negative-feedback circuit figure;
Switch in the drawings, 1; 2, switch; 3, servomotor; 4, switch; 5, negative-feedback; 6, negative-feedback; 7, switch.
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The specific embodiment
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example, only for explaining invention, is not intended to limit scope of the present invention.
A kind of electric discharge machining apparatus control system, comprise power supply, servo-drive system, puncture power supply, wire electrode and workpiece, described power supply provides servo-drive system required power supply by cable, the described power supply that punctures provides wire electrode and the required power supply that punctures of workpiece by cable, servo-drive system and wire electrode are integrated and drive wire electrode motion, it is characterized in that: also comprise that control module, gate-controlled switch and discharge breakdown detect, described control module by circuit with puncture power supply, servo-drive system, gate-controlled switch and discharge breakdown detection and be connected respectively; The equivalent resistance that punctures post gap when wire electrode and workpiece electrical discharge reduces, making has larger electric current to flow through in discharging gap, so by detecting the curent change of discharging gap, when discharge breakdown detects in circuit curent change, feed back to control module, control module is controlled gate-controlled switch and is disconnected, and feeds back to servo-drive system simultaneously, servo-drive system drives wire electrode revolution, completes cycling one time.When the discharge cycle time of setting then, it is closed that control module is controlled gate-controlled switch, discharge breakdown circuit working, servo-drive system controllable signal is provided simultaneously, servo-drive system drives wire electrode running work, and system enters next cycling, has has so come and gone whole workpiece processing work.
For making servo-drive system make that motor operates steadily, accurate positioning, the present invention has further improved the control circuit of servo-drive system, and this circuit comprises switch 1, switch 2, servomotor 3, switch 4, negative-feedback 5, negative-feedback 6 and switch 7; Switch 1, switch 7 and negative-feedback 6 are by cable series connection in circuit, and switch 1 one end connects positive source, and negative-feedback 6 one end connect power cathode; Switch 2, switch 4 and negative-feedback 5 are by cable series connection in circuit, and switch 2 one end connect positive source, and negative-feedback 5 one end connect power cathode; Servomotor 3 positive poles are connected on the line between switch 1 and switch 7 by cable, and servomotor 3 negative poles are connected on the line between switch 2 and switch 4 by cable; In pwm circuit, switch 1 and switch 7 be break-make simultaneously, and switch 2 and switch 4 be break-make simultaneously, makes the rapid lifting of motor; 6 negative feedback of negative-feedback 5 and negative-feedback, by the processing of circuit, operate steadily motor.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. an electric discharge machining apparatus control system, comprise power supply, servo-drive system, puncture power supply, wire electrode and workpiece, described power supply provides servo-drive system required power supply by cable, the described power supply that punctures provides wire electrode and the required power supply that punctures of workpiece by cable, servo-drive system and wire electrode are integrated and drive wire electrode motion, it is characterized in that: also comprise that control module, gate-controlled switch and discharge breakdown detect, described control module by circuit with puncture power supply, servo-drive system, gate-controlled switch and discharge breakdown detection and be connected respectively; The equivalent resistance that punctures post gap when wire electrode and workpiece electrical discharge reduces, making has larger electric current to flow through in discharging gap, so by detecting the curent change of discharging gap, when discharge breakdown detects in circuit curent change, feed back to control module, control module is controlled gate-controlled switch and is disconnected, and feeds back to servo-drive system simultaneously, servo-drive system drives wire electrode revolution, completes cycling one time.
2. electric discharge machining apparatus control system according to claim 1, is characterized in that: described servo-drive system comprises switch (1), switch (2), servomotor (3), switch (4), negative-feedback (5), negative-feedback (6) and switch (7); Switch (1), switch (7) and negative-feedback (6) are by cable series connection in circuit, and switch (1) one end connects positive source, and negative-feedback (6) one end connects power cathode; Switch (2), switch (4) and negative-feedback (5) are by cable series connection in circuit, and switch (2) one end connects positive source, and negative-feedback (5) one end connects power cathode; Servomotor (3) is anodal to be connected on the line between switch (1) and switch (7) by cable, and servomotor (3) negative pole is connected on the line between switch (2) and switch (4) by cable; In pwm circuit, switch (1) and switch (7) be break-make simultaneously, and switch (2) and switch (4) be break-make simultaneously, makes the rapid lifting of motor; Negative-feedback (5) and negative-feedback (6) play negative feedback, by the processing of circuit, motor are operated steadily.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310686209.3A CN103624344A (en) | 2013-12-16 | 2013-12-16 | Control system of electric discharge machining unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310686209.3A CN103624344A (en) | 2013-12-16 | 2013-12-16 | Control system of electric discharge machining unit |
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| CN103624344A true CN103624344A (en) | 2014-03-12 |
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| CN201310686209.3A Pending CN103624344A (en) | 2013-12-16 | 2013-12-16 | Control system of electric discharge machining unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607730A (en) * | 2015-01-12 | 2015-05-13 | 哈尔滨工业大学深圳研究生院 | Ultrasonic spray near drying type electrical discharge machining method and device |
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| US4788399A (en) * | 1984-06-29 | 1988-11-29 | Nicolas Mironoff | Electrical circuit for electro-discharge machines |
| CN101318241A (en) * | 2008-04-08 | 2008-12-10 | 哈尔滨工业大学 | Impulsing power source for spark pinhole processing |
| CN201195220Y (en) * | 2008-04-29 | 2009-02-18 | 蒋荣华 | High-frequency control system of medium-wire-walking numerical control machine |
| CN101791728A (en) * | 2010-01-28 | 2010-08-04 | 哈尔滨工业大学 | Voltage detection method between non-contact poles for electrostatic induction micro electro discharge machining and circuit design thereof |
| CN102248235A (en) * | 2011-05-23 | 2011-11-23 | 哈尔滨工业大学 | Device and method for detecting discharge state in electric spark linear cutting work gap |
| CN103240474A (en) * | 2012-02-13 | 2013-08-14 | 严政 | Discharge gap control method for electric discharge machining unit |
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2013
- 2013-12-16 CN CN201310686209.3A patent/CN103624344A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4788399A (en) * | 1984-06-29 | 1988-11-29 | Nicolas Mironoff | Electrical circuit for electro-discharge machines |
| CN101318241A (en) * | 2008-04-08 | 2008-12-10 | 哈尔滨工业大学 | Impulsing power source for spark pinhole processing |
| CN201195220Y (en) * | 2008-04-29 | 2009-02-18 | 蒋荣华 | High-frequency control system of medium-wire-walking numerical control machine |
| CN101791728A (en) * | 2010-01-28 | 2010-08-04 | 哈尔滨工业大学 | Voltage detection method between non-contact poles for electrostatic induction micro electro discharge machining and circuit design thereof |
| CN102248235A (en) * | 2011-05-23 | 2011-11-23 | 哈尔滨工业大学 | Device and method for detecting discharge state in electric spark linear cutting work gap |
| CN103240474A (en) * | 2012-02-13 | 2013-08-14 | 严政 | Discharge gap control method for electric discharge machining unit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607730A (en) * | 2015-01-12 | 2015-05-13 | 哈尔滨工业大学深圳研究生院 | Ultrasonic spray near drying type electrical discharge machining method and device |
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Application publication date: 20140312 |