CN108465888A - A kind of pulse condition identification circuit based on resistance variation characteristic - Google Patents
A kind of pulse condition identification circuit based on resistance variation characteristic Download PDFInfo
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- CN108465888A CN108465888A CN201810585985.7A CN201810585985A CN108465888A CN 108465888 A CN108465888 A CN 108465888A CN 201810585985 A CN201810585985 A CN 201810585985A CN 108465888 A CN108465888 A CN 108465888A
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- 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
- B23H1/024—Detection of, and response to, abnormal gap conditions, e.g. short circuits
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses a kind of pulse condition identification circuit based on resistance variation characteristic.The pulse condition identification circuit increases electrode impedance detection unit relative to gap average voltage detection circuit.Electrode impedance detection unit includes constant voltage DC source DC, current-limiting resistor voltage divider R1, the response characteristic module and diode D1 for regulating and controlling detection waveform；Regulate and control the response characteristic module of detection waveform by series with resistance R3 after resistance R2 and capacitance C1 parallel connections；It with the response characteristic wired in parallel of regulation and control detection waveform after constant voltage DC source DC and current-limiting resistor voltage divider R1 series connection, then connects with diode D1, diode D1 and resistance R3 connect the both ends of capacitance C1 respectively.The pulse condition identification circuit based on resistance variation characteristic of the present invention is suitable for the detection of fine electric spark discharge condition, can improve the stability and sensitivity of EDM micro elements discharging headlamp.
Description
Technical field
The invention belongs to Micro-EDM Machining Technology fields, and in particular to a kind of pulse type based on resistance variation characteristic
State identification circuit.
Background technology
Micro EDM is small with single pulse discharge energy, pulsed discharge frequency is high, discharging gap is small, noise is dry
Disturb the distinguishing features such as big, discharge condition complexity, cause process extremely unstable, the discharge condition of processing be difficult to accurately to detect and
Control, processing efficiency is low, and to significantly limit the development of Micro-EDM Machining Technology, material is processed especially for hardly possible
The processing of material and high-volume fine structure part, too low processing efficiency will have a direct impact on the application of Micro-EDM Machining Technology,
To seriously hinder the promotion of the precise and tiny manufacturing capacity of micro-scaled structures.Therefore, the accuracy of discharging headlamp and sensitive is promoted
Degree realizes real-time effective control of process, ensures the progress of process high-effect high-quality, is to improve fine electric spark to add
Work technical capability, the critical path for realizing micro-scaled structures part batch machining and key components and parts precision, high efficiency manufacture, while
It is the active demand that national Important Project field precision manufactureing level is promoted.
The identification of electrical discharge machining discharge condition is mainly by detecting the voltage of discharging gap, because of different electric discharge shapes
The corresponding voltage waveform of state is also different, with the presence or absence of height when additionally considering the discharging gap magnitude of current and pulsed discharge
The notable features such as frequency component, radiofrequency signal, sound signal judge.Traditional electrical discharge machining discharging headlamp method has height
Frequency signal detection method, breakdown delay detection method, average voltage detection method etc..Frequently be average voltage detection method, the party
Method refers under certain processing conditions, and processing is experience have shown that gap voltage when electrode gap stable discharging should maintain one
Range, more average voltage level of opening a way is higher, and the more average voltage of short circuit is relatively low, and spark discharge more at most average voltage level is suitable
In.Judge machining state by the way that threshold voltage is arranged, thinks at process if the average voltage of detection is higher than upper limit value
In open-circuit condition, if being considered as machining state less than lower limiting value is in arc discharge state or short-circuit condition, average electricity is detected
Be pressed between two threshold voltages is spark discharge.Although gap average voltage detection method has its principle simple application generally etc.
Feature, but in micro EDM, according to the different meetings of process requirements, there are many pulse parameters organized, and often
The pulse of narrow spaces, small duty ratio, and be difficult to keep as ideal waveform, this not only makes gap average voltage have fluctuation, and
And detection circuit actual voltage value and calculated value can be made to have larger difference, eventually lead to state-detection value and threshold decision
Sensitivity and accuracy reduce.Meanwhile between different pulse parameter groups, there is also differences for their state-detection value and threshold value
Different, this requires detection circuits corresponding sensitivity and accuracy etc., that is, well adapts to ability.So the average electricity in gap
Press detection method still defective for micro EDM.
Currently, there is an urgent need for develop it is a kind of can be suitable for micro EDM, the multigroup pulse for process requirements is joined
The detection circuit of several discharge conditions.
Invention content
Technical problem to be solved by the invention is to provide a kind of pulse condition identification circuit based on resistance variation characteristic.
The pulse condition identification circuit based on resistance variation characteristic of the present invention, its main feature is that：The pulse condition is distinguished
It includes discharge cell, electrode impedance detection unit and average voltage detection unit to know circuit；
The discharge cell includes the pulse power, processing anode and processing cathode, and the forward direction that processing anode connects the pulse power is defeated
Go out, processing cathode connects the negative sense output of the pulse power；
The electrode impedance detection unit includes constant voltage DC source DC, current-limiting resistor voltage divider R1, the response for regulating and controlling detection waveform
Personality modnies and diode D1；The response characteristic module of the regulation and control detection waveform by after resistance R2 and capacitance C1 parallel connections with electricity
It is in series to hinder R3；After constant voltage DC source DC and current-limiting resistor voltage divider R1 series connection simultaneously with the response characteristic module of regulation and control detection waveform
Connection, then connects with diode D1, and diode D1 and resistance R3 connect the both ends of capacitance C1 respectively；
The average voltage detection unit includes diode D2, resistance R4, resistance R5, capacitance C2, and resistance R4 and capacitance C2 are simultaneously
It connects again with resistance R5 and diode D2 after connection；
The processing anode of the diode D1 series termination discharge cells of the electrode impedance detection unit, the electrode impedance
The processing cathode of the resistance R3 series termination discharge cells of detection unit；The partial pressure current limliting electricity of the electrode impedance detection unit
Hinder the series connection end of the diode D2 of the series termination average detected voltage cell of R1, the constant pressure of the electrode impedance detection unit
The series connection end of the capacitance C2 of the series termination average detected voltage cell of DC source DC.
During micro EDM, the voltage magnitude size between positive and negative the two poles of the earth can taking with discharge channel
Make and break is opened and is changed, after this shows that two contrasted between solid dielectric of pulse feature electric field breakdown forms discharge channel, the impedance between the two poles of the earth
Quick change has occurred；By configuring a constant-voltage DC source, between being output to positive and negative polarities after electric resistance partial pressure current limliting, by
The variation of electrode impedance causes the bust of partial pressure value to change, then captures the variation by detection circuit, to judge discharge condition.
Us master in electrode impedance detection unit in the pulse condition identification circuit based on resistance variation characteristic of the present invention
It is used to detect the voltage magnitude variation of single pulse electric discharge, average voltage detection unit UA is mainly made up of RC filter circuits
To the average voltage detection circuit of Us, it to be used for average voltage amplitude detection when positive and negative polarities sequential short circuit.
The pulse condition identification circuit based on resistance variation characteristic of the present invention is to be directed in micro EDM often to make
Average voltage detects wave caused by the difference pulse parameter combination such as narrow spaces, small duty ratio, wave distortion, multivoltage amplitude
The problems such as shape is unstable, variation range is big and lag overcomes threshold voltage setting in the average voltage detection circuit of gap to need not
It is disconnected to attempt and adjust the shortcomings of being suitble to different pulse parameters and propose.The pulse based on resistance variation characteristic of the present invention
State identification circuit improves the stability and sensitivity that voltage magnitude is detected in process of pulse discharge, realizes to the shape that discharges
State accurately and in real time detects.
Detection stable state of the pulse condition identification circuit based on resistance variation characteristic of the present invention for different discharge conditions
Value is only related with the hardware parameter of circuit, and detection resolution will not change because pulse parameter changes；For different groups add
The variation of work pulse parameter, gap impedance is essentially identical, and the setting of threshold voltage also need not be according to pulse parameter
Variation is adjusted.Therefore, the pulse condition identification circuit of the invention based on resistance variation characteristic is only needed to circuit hardware
Each parameter optimizes adjustment and ensures that detection result and resolution ratio, and after the determination of circuit hardware parameter, for
The detection accuracy of gap state will not be affected because of the change of pulse parameter；Gap average voltage inspection is also avoided simultaneously
Threshold voltage setting needs to continuously attempt to and adjust the problem of could being suitble to different pulse parameters in slowdown monitoring circuit
The pulse condition identification circuit based on resistance variation characteristic of the present invention is suitable for the detection of fine electric spark discharge condition,
The stability and sensitivity of EDM micro elements discharging headlamp can be increased substantially.
Description of the drawings
Fig. 1 is the pulse condition identification circuit schematic diagram based on resistance variation characteristic of the present invention；
In figure, P+ is anode, is cathode with P-, and Z (t) is the impedance value at gap moment.
Specific implementation mode
The present invention will be described in detail with reference to the accompanying drawings and examples.
Following embodiment is merely to illustrate the present invention, and not limitation of the present invention.Related person skilled in the art exists
It in the case of not departing from the spirit and scope of the present invention, can also make a variety of changes, replace and modification, therefore same technology
Scheme also belongs to scope of the invention.
As shown in Figure 1, the pulse condition identification circuit based on resistance variation characteristic of the present invention includes discharge cell 1, pole
Between impedance detection unit 2 and average voltage detection unit 3；
The discharge cell 1 includes the pulse power, processing anode and processing cathode, and the forward direction that processing anode connects the pulse power is defeated
Go out, processing cathode connects the negative sense output of the pulse power；
The electrode impedance detection unit 2 includes constant voltage DC source DC, current-limiting resistor voltage divider R1, the response for regulating and controlling detection waveform
Personality modnies and diode D1；The response characteristic module of the regulation and control detection waveform by after resistance R2 and capacitance C1 parallel connections with electricity
It is in series to hinder R3；After constant voltage DC source DC and current-limiting resistor voltage divider R1 series connection simultaneously with the response characteristic module of regulation and control detection waveform
Connection, then connects with diode D1, and diode D1 and resistance R3 connect the both ends of capacitance C1 respectively；
The average voltage detection unit 3 include diode D2, resistance R4, resistance R5, capacitance C2, resistance R4 and capacitance C2 simultaneously
It connects again with resistance R5 and diode D2 after connection；
The processing anode of the diode D1 series terminations discharge cell 1 of the electrode impedance detection unit 2, interpolar resistance
The processing cathode of the resistance R3 series terminations discharge cell 1 of anti-detection unit 2；The partial pressure of the electrode impedance detection unit 2
The series connection end of the diode D2 of the series termination average detected voltage cell 3 of current-limiting resistance R1, electrode impedance detection are single
The series connection end of the capacitance C2 of the series termination average detected voltage cell 3 of the constant voltage DC source DC of member 2.
Embodiment 1
The course of work of the present embodiment is as follows：
1. the pulse power generates rectangular pulse, the voltage magnitude size between positive and negative the two poles of the earth can with discharge channel overlap joint with
It disconnects and changes, quick change has occurred in the impedance between the two poles of the earth.
A. before the two poles of the earth minim gap is breakdown, it is in open-circuit condition, the impedance of two interpolars is very big, on diode D1 and R3
No current passes through, and R1 and R2 partial pressures Us keep stablizing, and filtered voltage UA, which is in, to be stablized without fluctuation status；
B. after when the two poles of the earth, breakdown carries out electric discharge and arcing, impedance strongly reduces, and leads to the ends Us intrinsic standoff ratio suddenly change so that Us
Terminal voltage amplitude declines suddenly, and UA terminal voltages also decline therewith, but the lasting charging due to voltage E becomes with electrode impedance pulse feature
Change so that UA terminal voltages are declining simultaneous with fluctuation；
C. when short circuit occur in the two poles of the earth, the channel of two interpolars constitutes the bypass of divider resistance R2, causes Us terminal voltage amplitudes fast
Speed declines cannot charge close to the ends 0, UA, and the charge of capacitance C2 storages is released rapidly by R4, and voltage magnitude is also anxious therewith
Play declines.
In fine electric spark discharge process, after interpolar discharge channel is formed, impedance can change, impedance magnitude meeting
Between open circuit and short circuit, the different amplitudes of detection terminal voltage UA are shown as.
2. carrying out subsequent processing to the voltage of test side UA by AD samplings, discharge condition is identified.
In the present embodiment, diode D1 can prevent gap pulse from being impacted to detection circuit, and DC power supply DC is provided
Constant pressure needed for detection circuit, R1 resistance play a part of to divide current limliting.
The pulse condition identification circuit based on resistance variation characteristic of the present invention is acted on from the fine electric spark ground and is added
Work lathe discharge condition detection apparatus, last realization effect are as follows：When in open-circuit condition, detection voltage stabilization is without fluctuation；
And once discharged, voltage magnitude can decline rapidly；When electrode impedance difference, voltage magnitude also differs, and can be used for
Judge the trend of electric discharge.
Unless otherwise clearly defined and limited, in the pulse condition identification circuit of the invention based on resistance variation characteristic
Term " connecing " refer to being electrically connected.
Claims (1)
1. a kind of pulse condition identification circuit based on resistance variation characteristic, it is characterised in that：The pulse condition identification electricity
Road includes discharge cell（1）, electrode impedance detection unit（2）With average voltage detection unit（3）；
The discharge cell（1）Including the pulse power, processing anode and processing cathode, processing anode connects the forward direction of the pulse power
Output, processing cathode connect the negative sense output of the pulse power；
The electrode impedance detection unit（2）Including constant voltage DC source DC, current-limiting resistor voltage divider R1, the sound for regulating and controlling detection waveform
Answer personality modnies and diode D1；The response characteristic module of the regulation and control detection waveform by after resistance R2 and capacitance C1 parallel connections with
Resistance R3 is in series；After constant voltage DC source DC and current-limiting resistor voltage divider R1 series connection with the response characteristic module of regulation and control detection waveform
Parallel connection, then connect with diode D1, diode D1 and resistance R3 connect the both ends of capacitance C1 respectively；
The average voltage detection unit（3）Including diode D2, resistance R4, resistance R5, capacitance C2, resistance R4 and capacitance C2
It connects again with resistance R5 and diode D2 after parallel connection；
The electrode impedance detection unit（2）Diode D1 series termination discharge cells（1）Processing anode, the pole
Between impedance detection unit（2）Resistance R3 series termination discharge cells（1）Processing cathode；The electrode impedance detection unit
（2）Current-limiting resistor voltage divider R1 series termination average detected voltage cell（3）Diode D2 series connection end, the interpolar
Impedance detection unit（2）Constant voltage DC source DC series termination average detected voltage cell（3）Capacitance C2 series connection end.
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| CN201810585985.7A CN108465888B (en) | 2018-06-08 | 2018-06-08 | A kind of pulse condition identification circuit based on resistance variation characteristic |
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| CN108465888B CN108465888B (en) | 2019-10-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113271030A (en) * | 2021-05-25 | 2021-08-17 | 中国工程物理研究院机械制造工艺研究所 | Pulse generation control method for pulse power supply |
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| US3597570A (en) * | 1968-05-27 | 1971-08-03 | Mitsubishi Electric Corp | Device for detecting sustained arcing across electrospark machining gaps |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113271030A (en) * | 2021-05-25 | 2021-08-17 | 中国工程物理研究院机械制造工艺研究所 | Pulse generation control method for pulse power supply |
| CN113271030B (en) * | 2021-05-25 | 2022-11-29 | 中国工程物理研究院机械制造工艺研究所 | Pulse generation control method for pulse power supply |
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