CN101327534A - Pulse power source for electric spark machining capable of decreasing attrition of processing electrode - Google Patents
Pulse power source for electric spark machining capable of decreasing attrition of processing electrode Download PDFInfo
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- CN101327534A CN101327534A CNA2008101368481A CN200810136848A CN101327534A CN 101327534 A CN101327534 A CN 101327534A CN A2008101368481 A CNA2008101368481 A CN A2008101368481A CN 200810136848 A CN200810136848 A CN 200810136848A CN 101327534 A CN101327534 A CN 101327534A
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Abstract
The invention relates to an EDM pulse power source capable of reducing the electrode loss in the machining process, and belongs to the technical field of EDM pulse power source. The invention solves the problems of the pulse power sources in the prior art that the electrode loss is great, and the machining clearance is uneven. A signal output terminal of a pulse generating circuit is connected with a pulse signal input terminal of a drive; a pulse drive signal output terminal of the drive is connected with a drive signal input terminal of a power switch device; two signal output terminals of the power switch device are respectively connected with a power earthing and workpieces to be processed; a diode cathode is connected with one end of a wire electrode, while the diode anode is connected with the anode output terminal of a low-voltage switch power source, wherein the cathode output terminal of the low-voltage switch power source is a power earthing; the two terminals of a high-voltage current-limiting resistance are respectively connected with the diode cathode and the anode output terminal of a high-voltage DC electrical source; the two terminals of the resistance are respectively connected with the cathode and the power earthing of the diode. The invention is applicable to the prior EDM to provide a variety of pulse power sources, in particular, applicable to the linear cutting.
Description
Technical field
The present invention relates to the pulsed-power industry of spark machined.
Background technology
Spark machined claims discharge processing again, is called for short EDM, and the groundwork principle is by constantly producing the spark discharge of pulse feature between tool-electrode and the workpiece, a kind of processing method that local instantaneous generation high temperature gets off the metal ablation during by discharge.Spark machined is a kind of processing method that is most widely used in the electric machining industry, accounts for 90% of the sector.And Wire-cut Electrical Discharge Machining is the most frequently used a kind of processing method in the existing spark machined, has accounted for 60% of spark processing.The tool-electrode of Wire-cut Electrical Discharge Machining is a kind of tiny plain conductor, generally adopts copper wire or molybdenum filament.During Wire-cut Electrical Discharge Machining, in order to obtain reasonable surface roughness and high dimension precision, and guarantee that wire electrode is not blown, just must select stable, the pulse power reliably of output pulse signal.
The pulse power that existing spark machined is used referring to shown in Figure 1, is to adopt pulse gauge tap circuit, by the on off state of oscillating impulse control device for power switching; Be applied between tool-electrode and the workpiece to be processed by device for power switching output high-voltage pulse signal and carry out cutting processing.The low-voltage DC supply power supply of the control end of wherein said device for power switching, all be to adopt the driving control end that power frequency supply is offered device for power switching T2 after transformer T1 pressure regulation, rectification circuit B1 rectification, filter circuit C1 filtering, in driving the loop, also current-limiting resistance R1 to be arranged.Adopt this low-voltage DC supply power drives device for power switching to realize spark machined, load capacity is poor, especially when carrying out the line cutting, the amplitude decline situation of high-voltage pulse of output is more serious, has also that attrition of processing electrode is big, machining gap is inhomogeneous, the inconsistent problem of machined surface roughness.
Summary of the invention
The attrition of processing electrode that exists for the pulse power that solves existing spark machined is big, machining gap is inhomogeneous, the inconsistent problem of machined surface roughness, the invention provides a kind of electric spark working pulse power source that can reduce attrition of processing electrode.
The electric spark working pulse power source that can reduce attrition of processing electrode of the present invention, comprise device for power switching, pulse generating circuit, driver, diode, high-voltage DC power supply, high-voltage and current-limitation resistance and resistance, also comprise the low tension switch power supply, the signal output part of described pulse generating circuit is connected with the pulse signal input terminal of driver, the pulse drive signal output of driver is connected with the driving signal input of device for power switching, two signal output parts of described device for power switching are connected with workpiece to be processed with power supply ground respectively, one end of the negative electrode of diode and machined electrode is connected, the anode of described diode is connected with the cathode output end of low tension switch power supply, the cathode output end of described low tension switch power supply is power supply ground, the two ends of high-voltage and current-limitation resistance are connected with the negative electrode of described diode and the cathode output end of high-voltage DC power supply respectively, and the two ends of resistance are connected with power supply ground with the negative electrode of diode respectively.
Low-voltage control circuit one side of existing electric spark pulse processing power source all adopts current-limiting resistance, described current-limiting resistance is the effect that prevents to cause damaging owing to operating current is excessive device for power switching in process, this scheme has increased the reactive loss of power supply on the one hand, on the other hand, because the characteristic of resistance device, be that the resistance of resistance is subjected to its temperature effect and changes, cause the real work voltage of device for power switching unstable in the course of the work, and then cause voltage difference instability between machined electrode and the processing work, influence processing effect, cause machining gap inhomogeneous, the machined surface roughness is inconsistent, and because actual working power is low, discharge effect is bad, and short circuit problem between machined electrode and the processing work also takes place easily.
The present invention is owing to adopted the Switching Power Supply of prior art maturation to substitute the dc source of existing employing transformer and rectification circuit composition, and then omitted current-limiting resistance in the existing pulse power, make the output capacitance of the control loop of pulse power low-pressure side by Switching Power Supply, electrode, processing work becomes with set of power switches, i.e. Fang Dian electrode, processing work and device for power switching are connected in parallel on the two ends of the output capacitance of Switching Power Supply, in the course of the work, the output voltage of Switching Power Supply all is applied on the power switch pipe, there is not reactive loss, make the operating voltage of power switch pipe only be subjected to the influence of switch power source output voltage, because Switching Power Supply is existing mature technology, output voltage stabilization, load capacity is strong, stable operating voltage that can the guaranteed output switching tube, be that power output is stable, make the voltage difference between machined electrode and the processing work keep stable, discharge effect is good, be difficult for producing short circuit phenomenon, and machining gap is even, machined surface roughness is even, also greatly reduces the processing loss of machined electrode.
The present invention has overcome the technology prejudice of the pulsed-power industry of existing spark machined, adopt the working power of Switching Power Supply as low-voltage control circuit, and successful omission the current-limiting resistance in the low-voltage control circuit, avoided because the negative issue that current-limiting resistance brings, and produced beyond thought technique effect.
The pulse power of the present invention also has volume advantage little, low in energy consumption.
Description of drawings
Fig. 1 is the electrical block diagram of existing electric spark working pulse power source; Fig. 2 is an electrical block diagram of the present invention.
The specific embodiment
The specific embodiment one: the described electric spark working pulse power source that can reduce attrition of processing electrode of present embodiment, comprise device for power switching T2, pulse generating circuit 3, driver 4, diode D1, high-voltage DC power supply 5, high-voltage and current-limitation resistance R 2 and resistance R 3, also comprise low tension switch power supply 1, the signal output part of described pulse generating circuit 3 is connected with the pulse signal input terminal of driver 4, the pulse drive signal output of driver 4 is connected with the driving signal input of device for power switching T2, two signal output parts of described device for power switching T2 are connected with workpiece to be processed 7 with power supply ground respectively, one end of the negative electrode of diode D1 and machined electrode 6 is connected, the anode of described diode D1 is connected with the cathode output end of low tension switch power supply 1, the cathode output end of described low tension switch power supply 1 is power supply ground, the two ends of high-voltage and current-limitation resistance R 2 are connected with the negative electrode of described diode D1 and the cathode output end of high-voltage DC power supply 5 respectively, and the two ends of resistance R 3 are connected with power supply ground with the negative electrode of diode D1 respectively.
Adopt Switching Power Supply that the low-voltage driving power supply is provided, saved low-pressure side current-limiting resistance in the past, also improved the load capacity of the pulse power, make the pulse voltage of pulse power output more stable, adopt the described pulse power of present embodiment to carry out spark machined, export license is little, when the pulse power that adopts present embodiment is implemented the line cutting processing, machining gap is even, and machined surface roughness is even.
For example, adopt the pulse power power supply of present embodiment, select for use molybdenum filament to carry out the line cutting processing as wire electrode, the length of described wire electrode is 50m, is 11690mm to area
2, material is that the workpiece of Cr12 is processed, under the different situation of machining voltage, processing electric current, the loss situation that records molybdenum filament sees table respectively:
| Pulsewidth (μ s) | Between arteries and veins (μ s) | Frequency conversion (Hz) | Electric current (A) | Voltage (v) | Molybdenum filament loss (μ m) | Time (h) |
| 40 | 4 | 84.9 | 2.6-2.7 | 80.2/30.4 | Less than 1 | 5.1 |
| 40 | 5 | 84.9 | 2.3-2.4 | 80.2/30.4 | Less than 1 | 5.2 |
| 40 | 4 | 85.2 | 2.6-3.3 | 75/35 | 1 | 5.5 |
In addition, operating current in the low-voltage control circuit of existing electric spark pulse processing power source is realized by adjusting current-limiting resistance, and the low-voltage control circuit of the described pulse power of present embodiment is become by the output capacitance in the Switching Power Supply, electrode, processing work and set of power switches, there is not current-limiting resistance, when needs were adjusted processing electric current, the output voltage that only needs to adjust low tension switch power supply 1 can be realized.That is, the Switching Power Supply that can adopt Adjustable Output Voltage is as low tension switch power supply 1, more convenient like this adjustment processing electric current.
The specific embodiment two: present embodiment and the specific embodiment one described difference that can reduce the electric spark working pulse power source of attrition of processing electrode are; it also comprises protection diode D2; protection diode D2 and resistance R 3 are connected in parallel, and the anode of described protection diode D2 is connected with power supply ground.
The protection diode D2 that present embodiment increases prevents that the reversing the current that produces in the high tension loop during operation from damaging device for power switching T2.
The specific embodiment three: the present embodiment and the specific embodiment one or the two described differences that can reduce the electric spark working pulse power source of attrition of processing electrode are that described high-voltage DC power supply 5 is a Switching Power Supply.
The specific embodiment four: the present embodiment and the specific embodiment one or the two described differences that can reduce the electric spark working pulse power source of attrition of processing electrode are that described high-voltage DC power supply 5 is the adjustable dc source of output.
The specific embodiment five: present embodiment and the specific embodiment one, two, the three or four described differences that can reduce the electric spark working pulse power source of attrition of processing electrode are that described device for power switching T2 is switch triode, controllable silicon or CMOS pipe.
In order to increase the load capacity of device for power switching, described device for power switching T2 can adopt the multiple tube by a plurality of combination of power switches one-tenth.
Claims (7)
1, can reduce the electric spark working pulse power source of attrition of processing electrode, it comprises device for power switching (T2), pulse generating circuit (3), driver (4), diode (D1), high-voltage DC power supply (5), high-voltage and current-limitation resistance (R2) and resistance (R3), it is characterized in that it also comprises low tension switch power supply (1), the signal output part of described pulse generating circuit (3) is connected with the pulse signal input terminal of driver (4), the pulse drive signal output of driver (4) is connected with the driving signal input of device for power switching (T2), two signal output parts of described device for power switching (T2) are connected with workpiece to be processed (7) with power supply ground respectively, the negative electrode of diode (D1) is connected with an end of machined electrode (6), the anode of described diode (D1) is connected with the cathode output end of low tension switch power supply (1), the cathode output end of described low tension switch power supply (1) is power supply ground, the two ends of high-voltage and current-limitation resistance (R2) are connected with the negative electrode of described diode (D1) and the cathode output end of high-voltage DC power supply (5) respectively, and the two ends of resistance (R3) are connected with power supply ground with the negative electrode of diode (D1) respectively.
2, the electric spark working pulse power source that can reduce attrition of processing electrode according to claim 1 is characterized in that, described low tension switch power supply (1) is the Switching Power Supply of Adjustable Output Voltage.
3, the electric spark working pulse power source that can reduce attrition of processing electrode according to claim 1; it is characterized in that; it also comprises protection diode (D2), and protection diode (D2) is connected in parallel with resistance (R3), and the anode of described protection diode (D2) is connected with power supply ground.
4, the electric spark working pulse power source that can reduce attrition of processing electrode according to claim 1 is characterized in that described high-voltage DC power supply (5) is Switching Power Supply.
5, the electric spark working pulse power source that can reduce attrition of processing electrode according to claim 1 is characterized in that described high-voltage DC power supply (5) is the dc source of Adjustable Output Voltage.
6,, it is characterized in that described device for power switching (T2) is switch triode, controllable silicon or CMOS pipe according to the described electric spark working pulse power source that can reduce attrition of processing electrode of arbitrary claim in the claim 1 to 5.
7,, it is characterized in that described device for power switching (T2) is the multiple tube that is become by a plurality of set of power switches according to the described electric spark working pulse power source that can reduce attrition of processing electrode of arbitrary claim in the claim 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101368481A CN101327534A (en) | 2008-07-30 | 2008-07-30 | Pulse power source for electric spark machining capable of decreasing attrition of processing electrode |
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| CNA2008101368481A CN101327534A (en) | 2008-07-30 | 2008-07-30 | Pulse power source for electric spark machining capable of decreasing attrition of processing electrode |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103008803A (en) * | 2012-12-11 | 2013-04-03 | 中国石油大学(华东) | High-instantaneous-energy-density electric spark high-speed milling power supply device |
| CN107695470A (en) * | 2017-11-17 | 2018-02-16 | 肇庆市高讯数控设备有限公司 | Intelligent high-speed saves wire cutting high frequency pulse power supply |
| CN107775128A (en) * | 2016-08-31 | 2018-03-09 | 山东豪迈机械科技股份有限公司 | Electrical discharge machining pulse power and its control method |
| CN107824921A (en) * | 2017-12-18 | 2018-03-23 | 无锡微研精微机械技术有限公司 | Scarce the silk judgment means and determination methods of a kind of electric spark machine tool |
-
2008
- 2008-07-30 CN CNA2008101368481A patent/CN101327534A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103008803A (en) * | 2012-12-11 | 2013-04-03 | 中国石油大学(华东) | High-instantaneous-energy-density electric spark high-speed milling power supply device |
| CN103008803B (en) * | 2012-12-11 | 2016-05-04 | 中国石油大学(华东) | High instantaneous energy density electric spark high speed Milling Process supply unit |
| CN107775128A (en) * | 2016-08-31 | 2018-03-09 | 山东豪迈机械科技股份有限公司 | Electrical discharge machining pulse power and its control method |
| CN107695470A (en) * | 2017-11-17 | 2018-02-16 | 肇庆市高讯数控设备有限公司 | Intelligent high-speed saves wire cutting high frequency pulse power supply |
| CN107695470B (en) * | 2017-11-17 | 2023-10-03 | 肇庆市高讯数控设备有限公司 | Intelligent high-speed energy-saving wire-electrode cutting high-frequency pulse power supply |
| CN107824921A (en) * | 2017-12-18 | 2018-03-23 | 无锡微研精微机械技术有限公司 | Scarce the silk judgment means and determination methods of a kind of electric spark machine tool |
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Open date: 20081224 |