CN108672851A - A kind of very high frequency(VHF) self-vibration declines can electric machining clock - Google Patents
A kind of very high frequency(VHF) self-vibration declines can electric machining clock Download PDFInfo
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- CN108672851A CN108672851A CN201810585736.8A CN201810585736A CN108672851A CN 108672851 A CN108672851 A CN 108672851A CN 201810585736 A CN201810585736 A CN 201810585736A CN 108672851 A CN108672851 A CN 108672851A
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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
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Declining the invention discloses a kind of very high frequency(VHF) self-vibration can electric machining clock, the moment that the DC power supply E of the electric machining clock is connected, it will produce some faint current breaks and noise in circuit, this portion of energy is amplified by resonant element, by feedback unit by the grid of a certain proportion of energy input to field-effect tube, it tends towards stability after maintaining lasting self-oscillation, voltage magnitude and frequency to reache a certain level, forms dynamic equilibrium.Another part energy is processed workpiece by reaching tool-electrode and workpiece by current-limiting resistance R3 after capacitance C4 storages.The very high frequency(VHF) self-vibration of the present invention declines energy electric machining clock suitable for EDM micro elements, the voltage pulse width of generation is up to 5ns, discharge frequency is up to 100MHz, peak-to-peak value gap voltage is up to 400V or more, workpiece surface processing quality can be improved, mitigate the normal defects such as thermal damage, re cast layer and the heat affected area that workpiece occurs in process, achievees the effect that similar cold working.
Description
Technical field
The invention belongs to EDM micro elements technical fields, and in particular to a kind of very high frequency(VHF) self-vibration declines can electric machining pulse
Source.
Background technology
Micro-EDM Machining Technology is a kind of typical special processing technology, material remove energy from high frequency,
The pulse heat source of high heat flux density, the TRANSIENT HIGH TEMPERATURE generated using pulsed discharge, high pressure are processed to realize.Due to fine electric spark
Processing has that equipment is simple, controllability is good, without series of advantages such as cutting force, strong applicabilities, with tradition machinery processing compared to tool
It has a clear superiority, there is great application potential in the processing of micro element, it is considered to be most promising microfabrication
One of method.Micro EDM is generally considered to be Single Pulse Discharge energy 10-6~10-8J, pulsewidth within 10 μ s,
Electrical discharge machining of the electrode diameter under 500 μm.It, should due to micro EDM special non-contact, electric heating processing mechanism
Technology is suitable for the processing of any conductive material without being influenced by mechanical properties such as the strength of materials, hardness, so being particularly suitable for
In the processing of difficult-to-machine material, Low rigidity and thin-wall workpiece and micro- axis, micropore, complicated miniature three-dimensional structure.
The surface of micro EDM is made of a series of Single Pulse Discharge pit, single pulse energy it is big
The small size for determining impulse discharge etch pit influences the roughness of finished surface, the geometric dimension of fine workpiece and micro-electrode
Precision decides the limit capacity of micro EDM.The quality of micro-energy impulsing power source performance, directly affects fine electric spark
Precision, speed, stability, surface quality of processing etc..Therefore, in order to improve the processing efficiency and surface matter of fine electric spark
Amount, the good micro-energy impulsing power source of design performance are very effective one of approach.
Currently, the pulse power for being commonly used to fine electric spark mainly has following 3 kinds：RC formulas, stand alone type, electrostatic induction
Formula.For the RC formula pulse powers, energy can be reduced by reducing supply voltage or reducing the method for interpolar equivalent capacity.It does not deposit
In maintenance voltage, supply voltage can also carry out electro-discharge machining under the low pressure of 0.1V, but reducing supply voltage can guiding discharge
Gap reduces, it is difficult to continuously be processed；To reduce discharge energy, it is usually not connected to capacitor in circuit, only with distribution
Capacitance carries out electro-discharge machining, even if being to use nonmetallic lathe bed and shielded cable short as possible also is difficult to distribution capacity
Reduce to 100pF or less, it is believed that distribution capacity determines the limit of RC formula pulse power minimum discharge energies.For independence
The formula pulse power, there are gap maintenance voltages, generally 20 ~ 30V in process, can reduce single arteries and veins by compression pulse width
The discharge energy of punching, due to the limitation of traditional switch component itself, it is difficult to by Pulse Compression to very little, the electric discharge of single pulse
Energy is difficult to further decrease.For electrostatic induction formula power supply, the adverse effect of distribution capacity is efficiently avoided in principle, is put
Electric flux only by being determined to the static capacity formed between electrode and tool-electrode and between tool-electrode and workpiece, but
Its discharge frequency depends on the frequency of power supply.
It is can be found that from the achievement in research of domestic and foreign scholars：During micro-energy impulsing electric discharge removal, pulsewidth is narrower, pulse
Energy is smaller, and electric discharge forms that pit diameter is smaller, and heat affected area is smaller, and the surface quality of processing is better.When accurately controlling power supply
When the discharge energy of pulse is sufficiently small, so that it may to carry out nano level electrical discharge machining, while reducing single pulse energy, also
It should take into account and improve processing efficiency, reduce heat affected layer, be conducive to the factors such as chip removal, therefore, it is necessary to promote pulse frequency and maintaining
Compression pulse width under certain voltage amplitude improves the peak power of pulse.
Currently, there is an urgent need for carrying out new analysis and exploration to micro-energy impulsing power source, to realize efficient nanoscale electric discharge erosion
Except target.
Invention content
Technical problem to be solved by the invention is to provide a kind of very high frequency(VHF) self-vibration, decline can electric machining clock.
The present invention very high frequency(VHF) self-vibration decline can electric machining clock, its main feature is that：The electric machining clock includes
Power supply unit E, high frequency choke coil L1, high frequency choke coil L2, divider resistance R1, divider resistance R2, field-effect tube Q, resonance amplification
Unit, feedback unit, capacitance C4 and current-limiting resistance R3；The resonance amplifying unit is in series by inductance L4 and capacitance C3；
The feedback unit is parallel between two capacitances by inductance L3 after capacitance C1 and capacitance C2 series connection and is constituted；The power supply unit
E connects with high frequency choke coil L1, then connects with divider resistance R1, divider resistance R2, and one end of high frequency choke coil L2 is connected in
Between divider resistance R1 and divider resistance R2, the other end of high frequency choke coil L2 is connected in series in the grid of field-effect tube Q, inductance L4
One end it is in parallel with the drain electrode of field-effect tube Q, divider resistance R2, one end of high frequency choke coil L1, the other end of inductance L4 and electricity
It is in parallel with capacitance C4 after appearance C3 series connection, another termination and the capacitance C2 of capacitance C3, capacitance C1 and capacitance C2 series connection, the one of inductance L3
End is connected between capacitance C1 and capacitance C2, and the inductance L3 other ends are connected in the grid of high frequency choke coil L2 and field-effect tube Q
Between pole, one end of current-limiting resistance R3 is in parallel with capacitance C2, capacitance C3, capacitance C4, and the another of current-limiting resistance R3 is terminated at tool
Electrode, workpiece, capacitance C4, capacitance C1, the source electrode of field-effect tube Q, divider resistance R1 and power supply unit E other end ground connection.
The present invention very high frequency(VHF) self-vibration decline can the electric machining clock course of work it is as follows：
The moment that DC power supply E is connected will produce some faint current breaks and noise in circuit, this portion of energy passes through
Resonant element amplification in series inductance L4 and capacitance C3, by being parallel to two by inductance L3 after capacitance C1 and capacitance C2 series connection
The grid of a certain proportion of energy input to field-effect tube is remained lasting from exciting by the feedback unit constituted between capacitance
It swings, voltage magnitude and frequency tend towards stability after reaching a certain level, and form dynamic equilibrium.Another part energy is stored up by capacitance C4
Tool-electrode and workpiece are reached by current-limiting resistance R3 after depositing, workpiece is processed, entire circuit uses according to actual needs
20V ~ 300V DC power supplies are powered, and L1 and L2 are high frequency choke coil, eliminate the coupling between AC signal and DC power supply and ground.
Are happened at by a specific frequency and is known as resonant frequency fr by given inductance L4 and capacitance C3, resonance, impedance is in this feelings
Reach minimum under condition.
The present invention very high frequency(VHF) self-vibration decline can electric machining clock be to solve fine electric pulse supply voltage pulsewidth
Larger, when pulsewidth is relatively narrow, the relatively low guiding discharge gap of voltage magnitude is small, can not Continuous maching, the low processing efficiency of discharge frequency is low
The problems such as and propose.The present invention very high frequency(VHF) self-vibration decline can electric machining clock improve EDM micro elements electric discharge frequency
Rate, gap voltage when pulse width, realize gap it is larger when the processing of efficient nano grade.
The very high frequency(VHF) self-vibration of the present invention declines energy electric machining clock suitable for EDM micro elements, and the voltage pulse width of generation can
Up to 5ns, discharge frequency is up to 100MHz, and peak-to-peak value gap voltage is up to 400V or more.By changing the hardware parameter of circuit, i.e.,
The frequency of oscillation of adjustable circuit；By the voltage for promoting DC power supply, you can peak-to-peak value gap voltage is made to increase.The present invention's
Very high frequency(VHF) self-vibration decline can electric machining clock can improve workpiece surface processing quality, mitigate workpiece and occur in process
The normal defects such as thermal damage, re cast layer and heat affected area, achieve the effect that similar cold working.
Description of the drawings
Fig. 1 declines for the very high frequency(VHF) self-vibration of the present invention can electric machining clock structural schematic diagram.
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 very high frequency(VHF) self-vibration of the present invention declines, energy electric machining clock includes power supply unit E, high frequency choke
Enclose L1, high frequency choke coil L2, divider resistance R1, divider resistance R2, field-effect tube Q, resonance amplifying unit, feedback unit, capacitance
C4 and current-limiting resistance R3；The resonance amplifying unit is in series by inductance L4 and capacitance C3；The feedback unit is by electricity
Hold inductance L3 after C1 and capacitance C2 connects to constitute between being parallel to two capacitances；The power supply unit E goes here and there with high frequency choke coil L1
Connection, then connect with divider resistance R1, divider resistance R2, one end of high frequency choke coil L2 is connected in divider resistance R1 and partial pressure electricity
Between hindering R2, the other end of high frequency choke coil L2 is connected in series in the grid of field-effect tube Q, one end and the field-effect tube Q of inductance L4
Drain electrode, divider resistance R2, one end of high frequency choke coil L1 it is in parallel, the other end of inductance L4 is connected with capacitance C3, capacitance C3's
Another termination and capacitance C2, capacitance C1 and capacitance C2 are in parallel with capacitance C4 after connecting, and one end of inductance L3 is connected in capacitance C1
Between capacitance C2, the inductance L3 other ends are connected between high frequency choke coil L2 and the grid of field-effect tube Q, current-limiting resistance R3
One end it is in parallel with capacitance C2, capacitance C3, capacitance C4, the another of current-limiting resistance R3 is terminated at tool-electrode, workpiece, capacitance C4,
The other end ground connection of capacitance C1, the source electrode of field-effect tube Q, divider resistance R1 and power supply unit E.
Embodiment 1
The course of work of the present embodiment is as follows：
1. the moment that DC power supply E is connected, some faint current breaks and noise are will produce in circuit, this portion of energy is logical
Cross inductance L4 and capacitance C3 resonant element amplifications in series.
2. by by the inductance L3 feedback units in parallel constituted between two capacitances after capacitance C1 and capacitance C2 series connection by one
For the energy input of certainty ratio to the grid of field-effect tube, driving FET Q break-makes maintain lasting self-oscillation, voltage amplitude
Value and frequency tend towards stability after reaching a certain level, and form dynamic equilibrium.
3. entire circuit uses 20V ~ 300V DC power supplies to power according to actual needs, L1 and L2 are high frequency choke coil, are disappeared
Except the coupling between AC signal and DC power supply and ground.
4. another part energy by current-limiting resistance R3 after capacitance C4 storages by reaching tool-electrode and workpiece, to workpiece
It is processed.
By the present invention very high frequency(VHF) self-vibration decline can electric machining clock act on from grind EDM micro elements lathe electric discharge
Condition checkout gear, last realization effect are as follows：The voltage pulse width of generation is up to 5ns, and frequency is up to 100MHz, between peak-to-peak value
Gap voltage can improve suface processing quality up to 400V or more, mitigate thermal damage, re cast layer and hot shadow in process
The normal defects such as area are rung, achieve the effect that similar cold working.
Unless otherwise clearly defined and limited, very high frequency(VHF) self-vibration of the invention decline can be in electric machining clock term
" connecing " refers to being electrically connected.
Claims (1)
- The energy electric machining clock 1. a kind of very high frequency(VHF) self-vibration declines, it is characterised in that：The electric machining clock includes power supply Unit E, high frequency choke coil L1, high frequency choke coil L2, divider resistance R1, divider resistance R2, field-effect tube Q, resonance amplifying unit, Feedback unit, capacitance C4 and current-limiting resistance R3；The resonance amplifying unit is in series by inductance L4 and capacitance C3；Described Feedback unit is parallel between two capacitances by inductance L3 after capacitance C1 and capacitance C2 series connection and is constituted；The power supply unit E and height The L1 series connection of frequency choke coil, then connect with divider resistance R1, divider resistance R2, one end of high frequency choke coil L2 is connected in partial pressure electricity Between hindering R1 and divider resistance R2, the other end of high frequency choke coil L2 is connected in series in the grid of field-effect tube Q, one end of inductance L4 In parallel with the drain electrode of field-effect tube Q, divider resistance R2, one end of high frequency choke coil L1, the other end and the capacitance C3 of inductance L4 go here and there In parallel with capacitance C4 after connection, another termination and the capacitance C2 of capacitance C3, capacitance C1 and capacitance C2 series connection, one end of inductance L3 is in parallel It being connected between capacitance C1 and capacitance C2, the inductance L3 other ends are connected between high frequency choke coil L2 and the grid of field-effect tube Q, One end of current-limiting resistance R3 is in parallel with capacitance C2, capacitance C3, capacitance C4, and the another of current-limiting resistance R3 is terminated at tool-electrode, work The other end ground connection of part, capacitance C4, capacitance C1, the source electrode of field-effect tube Q, divider resistance R1 and power supply unit E.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810585736.8A CN108672851B (en) | 2018-06-08 | 2018-06-08 | A kind of very high frequency(VHF) self-vibration declines can electric machining clock |
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| CN201810585736.8A CN108672851B (en) | 2018-06-08 | 2018-06-08 | A kind of very high frequency(VHF) self-vibration declines can electric machining clock |
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| CN108672851A true CN108672851A (en) | 2018-10-19 |
| CN108672851B CN108672851B (en) | 2019-11-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992827A (en) * | 2020-07-07 | 2020-11-27 | 宁波市江北数控设备厂 | Multi-line parallel electric spark cutting sampling control device |
| CN112404614A (en) * | 2020-10-26 | 2021-02-26 | 中国工程物理研究院机械制造工艺研究所 | Device and method for detecting discharge state of very high frequency electric spark machining |
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| CN1049466A (en) * | 1989-08-16 | 1991-02-27 | 株式会社放电精密加工研究所 | The power circuit of machining is used to discharge |
| CN1101869A (en) * | 1993-06-30 | 1995-04-26 | 三菱电机株式会社 | Electrical discharge machine |
| JPH11347842A (en) * | 1998-06-10 | 1999-12-21 | Sodick Co Ltd | Electric discharge machining method and device |
| CN102143821A (en) * | 2008-09-02 | 2011-08-03 | 三菱电机株式会社 | Power supply device for electric discharge machine |
| JP2016107353A (en) * | 2014-12-03 | 2016-06-20 | 新日鉄住金マテリアルズ株式会社 | Discharge processing apparatus and discharge processing method |
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2018
- 2018-06-08 CN CN201810585736.8A patent/CN108672851B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049466A (en) * | 1989-08-16 | 1991-02-27 | 株式会社放电精密加工研究所 | The power circuit of machining is used to discharge |
| CN1101869A (en) * | 1993-06-30 | 1995-04-26 | 三菱电机株式会社 | Electrical discharge machine |
| JPH11347842A (en) * | 1998-06-10 | 1999-12-21 | Sodick Co Ltd | Electric discharge machining method and device |
| CN102143821A (en) * | 2008-09-02 | 2011-08-03 | 三菱电机株式会社 | Power supply device for electric discharge machine |
| JP2016107353A (en) * | 2014-12-03 | 2016-06-20 | 新日鉄住金マテリアルズ株式会社 | Discharge processing apparatus and discharge processing method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992827A (en) * | 2020-07-07 | 2020-11-27 | 宁波市江北数控设备厂 | Multi-line parallel electric spark cutting sampling control device |
| CN112404614A (en) * | 2020-10-26 | 2021-02-26 | 中国工程物理研究院机械制造工艺研究所 | Device and method for detecting discharge state of very high frequency electric spark machining |
| CN112404614B (en) * | 2020-10-26 | 2021-09-28 | 中国工程物理研究院机械制造工艺研究所 | Device and method for detecting discharge state of very high frequency electric spark machining |
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| CN108672851B (en) | 2019-11-08 |
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