CN106513877A - Control method of electric pulse spark discharge gap - Google Patents
Control method of electric pulse spark discharge gap Download PDFInfo
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- CN106513877A CN106513877A CN201610904400.4A CN201610904400A CN106513877A CN 106513877 A CN106513877 A CN 106513877A CN 201610904400 A CN201610904400 A CN 201610904400A CN 106513877 A CN106513877 A CN 106513877A
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- voltage value
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- working pulse
- direct impulse
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007514 turning Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 210000001367 artery Anatomy 0.000 claims description 3
- 210000003462 vein Anatomy 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000003754 machining Methods 0.000 abstract description 5
- 238000005520 cutting process Methods 0.000 abstract description 2
- 238000009760 electrical discharge machining Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010892 electric spark Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention relates to a control method of an electric pulse spark discharge gap. The control method is used for an electrosparking machine tool to keep a proper discharge gap between an electrode and a workpiece. The control method is characterized in that detection pulses are inserted into work pulse sets at intervals, the voltage values of work pulses are automatically adjusted through the detection pulses, the voltage values of the work pulses are matched with the workpiece feed speed, a spark discharge state is kept, the short circuit phenomenon is avoided, the probability of occurrence of the open circuit phenomenon is reduced, the machining efficiency and machining quality are improved, and meanwhile convenience of manually adjusting the cutting speed is eliminated. The short circuit current is detected in the period that the low-voltage detection pulses occur, electrode wire damage can be avoided, arcing can be avoided when the workpiece leaves the electrode, and the smoothness of the workpiece is prevented from being reduced.
Description
Technical field
The present invention relates to a kind of control method of electric pulse spark-discharge gap, the control method is for electric discharge machining apparatus
Bed, makes to keep suitable discharging gap between electrode and workpiece.
Background technology
The pulse power of electric spark drill hole machine tool its output voltage is all pre-set, in edm process
Without automatic Regulation function, the speed that moves towards between electrode and workpiece will be with the voltage matches of the pulse power, if feeding speed
Spend, if feed speed can make slowly excessively to be formed between workpiece and electrode and hold
Road, both phenomenons can all affect working (machining) efficiency and crudy；For making to maintain rational gap between electrode and workpiece, to produce
Spark discharge, this needs operator to adjust repeatedly feeding parameter according to processing situation, and this brings great inconvenience to operation.Therefore
It is necessary to automatically control the pulse power according to operating mode.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of control method of electric pulse spark-discharge gap, electrode with
Move towards speed within the specific limits between workpiece, by controlling the voltage of discharge pulse, make to maintain between electrode and workpiece
Rational gap, to ensure the formation of electric spark.
The technical scheme is that, a kind of control method of electric pulse spark-discharge gap, the pulse electricity used by which
Source device, including the pulse signal generator being made up of single-chip microcomputer and D/A converter, pulse signals carry out the work(of power amplification
Rate amplifier, detects the current detector of the output current of power amplifier, store pulse signal message and output current information
Holder and input data keyboard；Control method realizes that by the program inside single-chip microcomputer its step is：
First, setting voltage value is taken from holder, and single-chip microcomputer is pressed setting voltage value and exports one group of working pulse signal；
2nd, during each working pulse occurs, single-chip microcomputer accesses the current signal from current detector, such as in this work
In pulse signal, no signal current occurs, and continues to output this group of working pulse signal；Such as in this group of working pulse signal output mistake
Occurs current signal in journey, after this group of working pulse signal output terminates, into third step；
3rd, single-chip microcomputer exports one group of direct impulse signal, and the voltage of this group of direct impulse signal raises stepped one by one, and which is most
1.2 times for setting voltage value of high-voltage value, its minimum voltage value for setting voltage value 1/20；
4th, current detector is accessed during the appearance of direct impulse signal, as occurred when the magnitude of voltage of direct impulse signal is minimum
Current signal, stops the output of direct impulse signal, after coordination electrode is separated with workpiece, exports again direct impulse signal, then
Continue to access current detector；
Magnitude of voltage such as the direct impulse signal for electric current initially occur is less than last time working pulse signal voltage value, then make work arteries and veins
Rushing signal voltage value increases △ U, and the magnitude of voltage for heightening rear working pulse signal voltage value is stored in memory, then by this
Working pulse signal voltage value output services pulse signal after heightening；
Such as the magnitude of voltage of the direct impulse signal is more than or equal to last time working pulse signal voltage value, then working pulse signal voltage
Value keeps constant；
Magnitude of voltage such as direct impulse signal reaches peak and no current occurs, then make working pulse signal voltage value reduce △ U,
And the working pulse signal voltage value after turning down is stored in into memory, then by the working pulse signal voltage value after turning down
Output services pulse signal；
5th, after every group of working pulse end of output, whether inquiry has END instruction to be input into, if any control process terminates；Such as
Nothing, then go to third step.
Direct impulse is inserted in working pulse group in this control method compartment of terrain, by direct impulse come automatic adjustment work
The magnitude of voltage of pulse, the magnitude of voltage and feed-speed for making working pulse match, and keeps spark discharge state, it is to avoid short
The generation of road phenomenon, reduces open circuit phenomenon probability of occurrence, improves working (machining) efficiency and crudy, while broken away from relying on people
Work is adjusting the inconvenience of cutting speed.Short circuit current is detected during the detection pulse of low-voltage occurs, can prevent wire electrode from damaging
Wound, can prevent arcing when workpiece leaves electrode, it is to avoid workpiece fineness is reduced.
Description of the drawings
Circuit block diagrams of the Fig. 1 for spark pulse power device.
Fig. 2 is working pulse and direct impulse oscillogram.
In coordinate, u axles represent voltage in fig. 2, and I axles represent electric current.
Fig. 3 is single-chip microcomputer internal processes flow chart.
Specific embodiment
In conjunction with the specific embodiment of the description of the drawings present invention.
A kind of control method of spark pulse power device, described spark pulse power device, including by monolithic
The pulse signal generator that machine and D/A converter are constituted, pulse signals carry out the power amplifier of power amplification, detect power
The holder and input number of the current detector of the output current of amplifier, store pulse signal message and output current information
According to keyboard；Its control method is realized by running single-chip microcomputer internal processes.
After start, the workpiece on spark-erosion machine tool is moved to electrode with certain speed or electrode is moved to workpiece；
Operation single-chip microcomputer internal processes（Program flow diagram is as shown in Figure 3）, the program operation process is described as follows：
First, setting voltage value Ue is taken from holder, and single-chip microcomputer is pressed setting voltage value Ue and exports one group of working pulse signal, its ripple
Shape is as shown in the working pulse area 1 in Fig. 2.
2nd, during each working pulse occurs, single-chip microcomputer accesses the current signal from current detector, such as in the group
In working pulse signal, no signal current occurs, and continues to output this group of working pulse signal；The no current in the working pulse signal
Occur, represent the excessive no-spark electric discharge in gap between electrode and workpiece, power amplifier output loop is in open-circuit condition, needs
The gap between electrode and workpiece is waited to shorten；
Such as there is current signal during this group of working pulse signal output, after this group of working pulse signal output terminates,
Into third step.
3rd, single-chip microcomputer exports one group of direct impulse signal, the voltage of this group of direct impulse signal raise one by one it is stepped,
1.2 times for setting voltage value of its maximum voltage value Ug, its minimum voltage value Ud for setting voltage value 1/20, arranges minimum electricity
Arcing, the detection arteries and veins in the waveform such as Fig. 2 of direct impulse signal is produced when pressure value can prevent short circuit between electrode and workpiece
Rush shown in area 2.
4th, current detector is accessed during the appearance of direct impulse signal, when the magnitude of voltage of direct impulse signal is minimum such as
There is current signal, stop the output of direct impulse signal, after control stepper motor makes electrode separate with workpiece, output again is visited
Pulse signal is surveyed, is further continued for accessing current detector；
Magnitude of voltage such as the direct impulse signal for electric current initially occur is less than last time working pulse signal voltage value（As visited in Fig. 2
Survey shown in pulse area 1）, then heightening by increment △ U makes working pulse signal voltage value（As shown in Tu2Zhong working pulses area 2）, and
The magnitude of voltage for heightening rear working pulse signal voltage value is stored in into memory, then by the working pulse signal electricity after heightening
Pressure value output services pulse signal；The magnitude of voltage of direct impulse signal is less than working pulse signal voltage value, represents feed speed
Too fast, the length of time one occurs short circuit, it is therefore desirable to heighten working pulse signal voltage value to increase workpiece by spark eroding
Speed；
Such as the magnitude of voltage of the direct impulse signal is more than or equal to last time working pulse signal voltage value, then working pulse signal voltage
Value keeps constant；
Magnitude of voltage such as direct impulse signal reaches peak and no current occurs（As shown in Tu2Zhong direct impulses area 2）, then by increasing
Amount △ U are turned down and are made working pulse signal voltage value, and the working pulse signal voltage value after turning down is stored in memory, then
Working pulse signal voltage value output services pulse signal after turning down by this（Such as Tu2Zhong working pulses area 3）；Direct impulse is believed
Number magnitude of voltage reach peak and no current and occur, represent that the magnitude of voltage of working pulse signal is excessive, workpiece is by spark eroding
Speed be more than feed speed, between workpiece and electrode occur open circuit；After working pulse signal voltage value is turned down, with workpiece
Feeding open circuit phenomenon can be eliminated；
Increment of adjustment of the described △ U for working pulse signal voltage value, the big I of △ U is in working pulse signal voltage value
Select in 2% to 10%.
5th, after every group of working pulse end of output, whether inquiry has END instruction to be input into, if any control process terminates；
Such as nothing, then third step is gone to.
The number of every group of working pulse is set as 80-160, and the number of every group of direct impulse can be set to 8 to 32, detection
The number of pulse is more, and the precision for adjusting working pulse magnitude of voltage is higher, but the time that direct impulse takes is also more；It is preferred that per group
The number of direct impulse is 8, the contour rising of magnitude of voltage of wherein second to the 8th direct impulse, the 5th direct impulse
Magnitude of voltage it is equal with setting voltage value Ue.Detection can be shortened on the basis of adjustment working pulse magnitude of voltage precision is ensured so
The time that pulse takes.
For further shortening the time that direct impulse takes, once detecting electric current in direct impulse output procedure, then
Do not continue to export direct impulse below（As shown in Tu2Zhong direct impulses area 1）.
Model AT89C52 of described single-chip microcomputer, the clock cycle of single-chip microcomputer are set to 12MHZ, the number of D/A converter
It it is 8 according to line, the voltage of D/A converter output has 256 kinds of changes, the set of frequency of working pulse signal and direct impulse signal
For 20KHZ, single-chip microcomputer can rapidly adjust the output voltage of D/A converter and conversion waveform.The model of described holder
For AT24C01, the data of storage after power down, will not be lost.
Claims (2)
1. a kind of control method of electric pulse spark-discharge gap, its Pulased power supply unit for being used, including by single-chip microcomputer and
The pulse signal generator that D/A converter is constituted, pulse signals carry out the power amplifier of power amplification, detect power amplification
The keyboard of the current detector of the output current of device, the holder of store pulse signal message and input data；Control method
Realized by the program inside single-chip microcomputer, its step is：
First, setting voltage value is taken from holder, and single-chip microcomputer is pressed setting voltage value and exports one group of working pulse signal；
2nd, during each working pulse occurs, single-chip microcomputer accesses current detector, such as without electricity in this group of working pulse signal
Stream signal occurs, and continues to output this group of working pulse signal；Such as occurs electric current letter during this group of working pulse signal output
Number, after this group of working pulse signal output terminates, into third step；
3rd, single-chip microcomputer exports one group of direct impulse signal, the magnitude of voltage of this group of direct impulse signal raise one by one it is stepped, its
1.2 times for setting voltage value of maximum voltage value, its minimum voltage value for setting voltage value 1/20；
4th, current detector is accessed during the appearance of direct impulse signal, as occurred when the magnitude of voltage of direct impulse signal is minimum
Current signal, stops the output of direct impulse signal, after coordination electrode is separated with workpiece, exports again direct impulse signal, then
Continue to access current detector；
Magnitude of voltage such as the direct impulse signal for electric current initially occur is less than last time working pulse signal voltage value, then make work arteries and veins
Rushing signal voltage value increases △ U, and the magnitude of voltage for heightening rear working pulse signal voltage value is stored in memory, then by this
Working pulse signal voltage value output services pulse signal after heightening；
Such as the magnitude of voltage of the direct impulse signal is more than or equal to last time working pulse signal voltage value, then working pulse signal voltage
Value keeps constant；
Magnitude of voltage such as direct impulse signal reaches peak and no current occurs, then make working pulse signal voltage value reduce △ U,
And the working pulse signal voltage value after turning down is stored in into memory, then by the working pulse signal voltage value after turning down
Output services pulse signal；
5th, after every group of working pulse end of output, whether inquiry has END instruction to be input into, if any control process terminates；Such as
Nothing, then go to third step.
2. the control method of the electric pulse spark-discharge gap according to claim, is characterized in that, the big I of increment △ U
Select in the 2% to 10% of working pulse signal voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610904400.4A CN106513877B (en) | 2016-10-18 | 2016-10-18 | A kind of control method of electric pulse spark-discharge gap |
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| CN201610904400.4A CN106513877B (en) | 2016-10-18 | 2016-10-18 | A kind of control method of electric pulse spark-discharge gap |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735636A (en) * | 2017-03-31 | 2017-05-31 | 山东豪迈机械科技股份有限公司 | Electrical discharge machining discharging headlamp circuit and method |
| CN106624217B (en) * | 2016-10-18 | 2018-06-22 | 丁毅 | A kind of control method of spark pulse power device |
| CN108393548A (en) * | 2018-01-25 | 2018-08-14 | 西安理工大学 | A kind of the discharging gap control system and control method of Wire EDM monocrystalline silicon |
| CN109277657A (en) * | 2018-11-16 | 2019-01-29 | 苏州哈工乔德智能装备有限公司 | Adaptive discharge control system and method for wire wire cutting |
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| US4728764A (en) * | 1984-02-01 | 1988-03-01 | Nec Corporation | Apparatus for detecting discharge gap in electric discharge machining |
| CN85104688A (en) * | 1985-06-19 | 1986-12-24 | 洛迦诺电子工业股份有限公司 | The adaptive control method of spark eroding cutting and electric spark cutter sweep running parameter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106624217B (en) * | 2016-10-18 | 2018-06-22 | 丁毅 | A kind of control method of spark pulse power device |
| CN106735636A (en) * | 2017-03-31 | 2017-05-31 | 山东豪迈机械科技股份有限公司 | Electrical discharge machining discharging headlamp circuit and method |
| CN108393548A (en) * | 2018-01-25 | 2018-08-14 | 西安理工大学 | A kind of the discharging gap control system and control method of Wire EDM monocrystalline silicon |
| CN109277657A (en) * | 2018-11-16 | 2019-01-29 | 苏州哈工乔德智能装备有限公司 | Adaptive discharge control system and method for wire wire cutting |
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| CN106513877B (en) | 2018-05-01 |
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Effective date of registration: 20191223 Address after: Group 3, Yuxi village, Yuxi Town, Jiangyan District, Taizhou City, Jiangsu Province Patentee after: BAOSHIJIE CNC machine tool Jiangsu Co., Ltd Address before: Jiangyan District of Jiangsu city in Taizhou province 225500 Luo Tong Street No. 7 Building 301 room Jiahe Lai Patentee before: Ding Yi |