CN207026653U - Electrical discharge machining pulse power and processing unit (plant) - Google Patents
Electrical discharge machining pulse power and processing unit (plant) Download PDFInfo
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- CN207026653U CN207026653U CN201720243983.0U CN201720243983U CN207026653U CN 207026653 U CN207026653 U CN 207026653U CN 201720243983 U CN201720243983 U CN 201720243983U CN 207026653 U CN207026653 U CN 207026653U
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- pulse signal
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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
-
- 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
- B23H1/022—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges for shaping the discharge pulse train
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The utility model provides electrical discharge machining pulse power and processing unit (plant).A kind of electrical discharge machining pulse power may include：Microcontroller, it is based on electric machining order generation start pulse signal and current setting signal；Drive circuit, it is based on current setting signal and generates the first pulse signal and generate the second pulse signal and the 3rd pulse signal based on start pulse signal；First power circuit, the first power circuit generate first voltage signal under the control of the first pulse signal；Second source circuit, second source circuit generate second voltage signal under the control of the 3rd pulse signal；And electrode, electrode is coupled to the first power circuit and second source circuit to receive first voltage signal and/or second voltage signal, wherein the first power circuit includes first bypass in parallel with electrode, and the first bypass is selectively turned on or turned off under the control of the second pulse signal to control first voltage signal to be provided to the first bypass or electrode.
Description
Technical field
It the utility model is related to electric spark machining field, more particularly to electrical discharge machining pulse power and processing unit (plant).
Background technology
Electrical discharge machining is to corrode metal using spark discharge to realize the processing method of metal cutting.The work of this processing
Process compensate for some deficiencies of machining, it has also become the important means in mould industry, national defense industry and precise and tiny manufacture.
Electric spark power supply forms spark discharge as the important composition part in EDM System for providing pulse current,
Its performance has to technical-economic indexes such as the machining accuracy of electrical discharge machining, production efficiency, tool electrode loss, utilization rate of electrical
Large effect.
Traditional power supply uses resistance current limliting, and the utilization rate of electric energy is low (for example, about 26%), and machine tooling efficiency is slow, therefore
Hinder maintenance rate more and more higher, it is therefore desirable for a kind of energy-conservation of design, efficient electrical discharge machining pulse power.
In addition, because the current density on electrode machining surface is definite value, about 8-10A/cm3, common power processing electricity
Stream is only 60A.The electric current that power supply provides is small, the electro-discharge machining region of each electrode can be caused small, for the workpiece of high surface area
Electric machining, such as mould inner surface, it is necessary to repeatedly be processed using multiple electrodes of different shapes, processing efficiency is low.Existing power supply
The processing suitable for electrode with large surface area can not be realized.
In addition, for the power discharging device of power supply, it is most of to use voltage driven type device.This power discharging device switch
Frequency is relatively low, current tail phenomenon be present during cut-off.If by voltage driven type devices in series in discharge loop, because electric current
It the presence of conditions of streaking, will make to reduce between effective arteries and veins, therefore limit the lifting of power switch frequency, add so as to limit in electricity
Application in work finishing field.
For traditional electrical discharge machining pulse power, due to the presence and influence of parasitic parameter in circuit, between arteries and veins during between
Gap voltage is not zero, and can produce harmful effect to gap deionization, can also influence the further lifting of discharge frequency.
A kind of it is therefore desirable for improved electrical discharge machining pulse power of design.
Utility model content
The utility model provides efficient electrical discharge machining pulse power and processing unit (plant).
According in one embodiment of the present utility model, a kind of electrical discharge machining pulse power includes microcontroller, and it is based on
Electric machining order generates start pulse signal and current setting signal；Drive circuit, it is generated based on the current setting signal
First pulse signal simultaneously generates the second pulse signal and the 3rd pulse signal based on the start pulse signal；First power supply electricity
Road, first power circuit generate first voltage signal under the control of first pulse signal；Second source circuit, institute
State second source circuit and second voltage signal is generated under the control of the 3rd pulse signal；And electrode, the electrode coupling
First power circuit and the second source circuit are bonded to receive the first voltage signal and/or the second voltage
Signal, wherein first power circuit includes first bypass in parallel with the electrode, first bypass is described second
Selectively turn on or turn off under the control of pulse signal to control the first voltage signal to be provided to first bypass
Or the electrode.
In one aspect, first power circuit includes first voltage source, first coupled to the first voltage source
Power discharging device and the inductance coupled to first power discharging device, wherein described in the first pulse signal on or off
First power discharging device is to control charging of the first voltage source to the inductance.
In one aspect, first bypass includes the second power discharging device, wherein second pulse signal conducting or pass
Second power discharging device break to control the first voltage signal to be provided to second power discharging device or the electrode.
In one aspect, the second source circuit includes：The second voltage source；And be coupling in the second voltage source with
The 3rd power discharging device between the electrode, wherein the second voltage source carries via the 3rd power discharging device to the electrode
For the second voltage signal, wherein the 3rd power discharging device described in the 3rd pulse signal on or off.
In one aspect, the 3rd pulse signal turns on the 3rd power discharging device with from the second voltage source to institute
State electrode and the second voltage signal is provided, so as to puncture the gap between the electrode and workpiece and establish discharge channel.
In one aspect, second pulse signal is the inversion signal of the start pulse signal.
In one aspect, the 3rd pulse signal is identical with the start pulse signal or the start pulse signal
Effectual time beginning short pulse.
In one aspect, first pulse signal is included in the periodicity in the effectual time of the current setting signal
Pulse signal, the first power discharging device described in the cyclic pulse signal on or off is to control the first voltage source to institute
State the charging of inductance.
In one aspect, first power circuit also includes：Transistor, its positive pole are coupled to the inductance and negative pole
Coupled to the electrode, wherein first bypass coupling is between the negative or positive electrode of the transistor and ground connection.
In one aspect, first power circuit also includes：Second bypass, second bypass and the described first bypass
Parallel connection, wherein first bypass coupling to the negative pole of the transistor and second bypass coupling to the transistor just
Pole, wherein the drive circuit is based further on the start pulse signal to generate the 4th pulse signal, second bypass
Selectively turn on or turn off under the control of the 4th pulse signal.
In one aspect, second bypass includes the 4th power discharging device, and the 4th pulse signal on or off
4th power discharging device.
In one aspect, the 3rd pulse signal is identical with the start pulse signal, and the 4th pulse signal is
The inversion signal of the start pulse signal.
In one aspect, the 3rd pulse signal is identical with the start pulse signal, and the 4th pulse signal exists
The start pulse signal is inverted to effectively to turn on the 4th power discharging device when being changed into invalid, and believed in the trigger pulse
Number it is changed into being changed into after effective and delay scheduled time invalid to turn off the 4th power discharging device.
In one aspect, the scheduled time is 0-10us.
In one aspect, the 3rd pulse signal is the short arteries and veins at the effectual time beginning of the start pulse signal
Punching, the 3rd power discharging device are turned on during the short pulse and turned off after the short pulse terminates, the 4th pulse
Signal is inverted to when the start pulse signal is changed into invalid effectively to turn on the 4th power discharging device, and in the triggering
It is changed into when pulse signal is changed into effectively or afterwards and before the short pulse terminates invalid to turn off the 4th amplifirer
Part.
In one aspect, first power circuit also includes：Current feedback unit, the current feedback unit detection stream
Current detection signal is simultaneously supplied to the drive circuit to adjust the arteries and veins of first pulse signal by the electric current through the inductance
Wide and pulse spacing size.
In one aspect, the drive circuit is further received and applied by the electrode to the voltage of workpiece, and according to
The voltage adjusts the pulsewidth of first pulse signal and pulse spacing size.
In one aspect, the start pulse signal after current setting signal delay preset time period than starting.
In one aspect, the start pulse signal is 0.1us -1000us adjustable start pulse signal.
In one aspect, the voltage of the second voltage source is higher than the voltage of the first voltage source.
In one aspect, the voltage of the first voltage source is 30-90V, and the voltage of the second voltage source is 160V-
190V。
According in one embodiment of the present utility model, there is provided a kind of electric discharge machining apparatus, it includes as above institute
The electrical discharge machining pulse power stated.
In one aspect, the electric discharge machining apparatus also includes：Processing groove, the processing groove be used for fix workpiece and
Gap is formed between the electrode of the workpiece and the electrical discharge machining pulse power.
According in one embodiment of the present utility model, there is provided a kind of electric discharge machining method, including：Added based on electricity
Work order generates start pulse signal and current setting signal；First pulse signal is generated based on the current setting signal；Base
The second pulse signal and the 3rd pulse signal are generated in the start pulse signal；Using the first power circuit in first arteries and veins
Rush generation first voltage signal under the control of signal；Generated using second source circuit under the control of the 3rd pulse signal
The second voltage signal is simultaneously supplied to electrode by second voltage signal；And selected under the control of second pulse signal
Property on or off it is in parallel with the electrode first bypass, to control the first voltage signal to be provided to described first
Bypass or the electrode.
In one aspect, first power circuit includes first voltage source, first coupled to the first voltage source
Power discharging device, the inductance coupled to first power discharging device, wherein first described in the first pulse signal on or off
Power discharging device is to control charging of the first voltage source to the inductance.
In one aspect, first bypass includes the second power discharging device, and the second pulse signal on or off
Second power discharging device is to control the first voltage signal to be provided to second power discharging device or the electrode.
In one aspect, the second source circuit includes：The second voltage source；And be coupling in the second voltage source with
The 3rd power discharging device between the electrode, wherein the second voltage source carries via the 3rd power discharging device to the electrode
For the second voltage signal, and the 3rd power discharging device described in the 3rd pulse signal on or off.
In one aspect, the 3rd pulse signal turns on the 3rd power discharging device with from the second voltage source to institute
State electrode and the second voltage signal is provided, so as to puncture the gap between the electrode and workpiece and establish discharge channel.
In one aspect, second pulse signal is the inversion signal of the start pulse signal.
In one aspect, the 3rd pulse signal is identical with the start pulse signal or the start pulse signal
Effectual time beginning short pulse.
In one aspect, first pulse signal is included in the periodicity in the effectual time of the current setting signal
Pulse signal, the first power discharging device described in the cyclic pulse signal on or off is to control the first voltage source to institute
State the charging of inductance.
In one aspect, first power circuit also includes：Transistor, its positive pole are coupled to the inductance and negative pole
Coupled to the electrode, wherein first bypass coupling is between the negative or positive electrode of the transistor and ground connection.
In one aspect, first power circuit also includes：Second bypass, second bypass and the described first bypass
Parallel connection, wherein first bypass coupling to the negative pole of the transistor and second bypass coupling to the transistor just
Pole, wherein methods described further comprise：4th pulse signal, second bypass are generated based on the start pulse signal
Selectively turn on or turn off under the control of the 4th pulse signal.
In one aspect, second bypass includes the 4th power discharging device, and the 4th pulse signal on or off
4th power discharging device.
In one aspect, the 3rd pulse signal is identical with the start pulse signal, and the 4th pulse signal is
The inversion signal of the start pulse signal.
In one aspect, the 3rd pulse signal is identical with the start pulse signal, and the 4th pulse signal exists
The start pulse signal is inverted to effectively to turn on the 4th power discharging device when being changed into invalid, and believed in the trigger pulse
Number it is changed into being changed into after effective and delay scheduled time invalid to turn off the 4th power discharging device.
In one aspect, the scheduled time is 0-10us.
In one aspect, the 3rd pulse signal is the short arteries and veins at the effectual time beginning of the start pulse signal
Punching, the 3rd power discharging device are turned on during the short pulse and turned off after the short pulse terminates, the 4th pulse
Signal is inverted to when the start pulse signal is changed into invalid effectively to turn on the 4th power discharging device, in the triggering arteries and veins
Rush when signal is changed into effectively or be changed into invalid to turn off the 4th amplifirer afterwards and before the short pulse terminates
Part.
In one aspect, the electric discharge machining method further comprises：Detection flows through the electric current of the inductance and by electricity
Stream detection signal is supplied to the drive circuit to adjust the pulsewidth of first pulse signal and pulse spacing size.
In one aspect, the electric discharge machining method further comprises：Detection is applied to workpiece by the electrode
Voltage, and adjust according to the voltage pulsewidth and pulse spacing size of first pulse signal.
In one aspect, the start pulse signal after current setting signal delay preset time period than starting.
In one aspect, the start pulse signal is 0.1us -1000us adjustable start pulse signal.
In one aspect, the voltage of the second voltage source is higher than the voltage of the first voltage source.
In one aspect, the voltage of the first voltage source is 30-90V, and the voltage of the second voltage source is 160V-
190V。
As above, the utility model provides a kind of new electrical discharge machining pulse power and its control method.Pass through power discharging device
Bypass changeover, it is possible to achieve electric current between electrode and workpiece improves working frequency without climbing and conditions of streaking.In addition, pass through
Power discharging device is in parallel with electrode, workpiece, and period gap voltage rapidly goes to zero between controlling its switch to realize arteries and veins, so as to accelerate
Deionization.
Brief description of the drawings
Fig. 1 shows the circuit diagram of the electrical discharge machining pulse power according to one embodiment of the present utility model.
Fig. 2 shows the electrical discharge machining signal waveform schematic diagram according to one embodiment of the present utility model.
Fig. 3 shows the circuit diagram of the electrical discharge machining pulse power according to another embodiment of the present utility model.
Fig. 4 shows the electrical discharge machining signal waveform schematic diagram according to another embodiment of the present utility model.
Fig. 5 shows the electrical discharge machining pulse power control method according to the embodiment of the utility model one.
Embodiment
With reference to specific embodiments and the drawings, the utility model is described in further detail, but should not limit this practicality with this
New protection domain.
Fig. 1 shows the circuit diagram of the electrical discharge machining pulse power 100 according to one embodiment of the present utility model.Should
Electrical discharge machining pulse power 100 may include control unit 110, the first power circuit 130, second source circuit 140 and be connected to
The electrode 150 of first power circuit 130 and second source circuit 140.The power supply can also be provided with overvoltage and over-current detector, blower fan
Detector, discharging headlamp device etc., these components are not described in detail in the utility model for clarity.Control unit
110 are used to control the first power circuit 130 generation first voltage signal and/or control second source circuit 140 to generate the second electricity
Signal is pressed to be applied on electrode 150.In one example, electrode 150 can use positive polarity to set.Electrode 150 receives first
Voltage signal and/or second voltage signal are intermittently discharged, and discharge channel can be formed between electrode 150 and workpiece to produce
Electric spark, so as to carry out machining to workpiece (for example, metal).Workpiece can be fixed on pedestal or be fixed on processing groove
In.In one example, working fluid can be supplied to processing groove, processing gap is processed liquid and filled up.According to electricity of the present utility model
Spark processing power source 100 can be used in various electric discharge machining apparatus.For example, electrical discharge machining pulse power 100 can be electric spark
Fixation kit in processing unit (plant).In other examples, the electrical discharge machining pulse power 100 can be hand-held, moveable, and
And it can apply to not need the situation of processing groove/pedestal.
Control unit 110 may include microcontroller 112, be connected to the drive circuit 114 of microcontroller 112.Microcontroller
112, which can be based on electric machining order, produces adjustable start pulse signal CP and current setting signal Is.For example, microcontroller
112 can receive the electric machining order from user via user interface (for example, start button, graphic user interface, button etc.),
Or the electric machining order from host computer can be received via bus.Microcontroller 112 can be based on different (for example, different electricity
Cooked mode, different time length, varying strength etc.) electric machining order and generate different start pulse signal CP and electric current is set
Confidence Is.Current setting signal Is can be used for the size for controlling electric machining electric current.The whole electricity of start pulse signal CP controls
Startup/stopping of spark process, such as electric machining is carried out when start pulse signal CP is effective, and in start pulse signal
Stop electric machining when CP is invalid.Start pulse signal CP can be periodic square-wave signal.Start pulse signal CP arteries and veins
It can be adjustable to rush width, pulse spacing etc..For example, trigger pulse letter can be adjusted in real time according to different machining states
Number CP.Non-limiting as example, start pulse signal CP can be 0.1us -1000us adjustable start pulse signal.
Drive circuit 114 can receive start pulse signal CP and current setting signal Is, and generate multiple pulse signal CP1, CP2,
HCP, to control the operation of the first power circuit 130 and second source circuit 140, as described in more detail below.
First power circuit 130 may include first voltage source 132, the first power discharging device G1, inductance L, current feedback unit
134th, the first 136 and transistor D1-D3 of bypass.Non-limiting as example, the first bypass 136 can include the second power amplifier
Device G2, as shown in fig. 1.It will be understood by those skilled in the art that the first bypass 136, which can include other, has switching function
Component.Illustrated below by taking the second power discharging device G2 as an example, but not as restriction.Second power discharging device G2 and electrode 150 are simultaneously
Connection, the second power discharging device G2 one end are connected to transistor D1 negative or positive electrode, the second power discharging device G2 other end connection
To ground (or negative pole of first voltage source 132).Second source circuit 140 includes the second voltage source 142, resistance R, the 3rd amplifirer
Part G3 and transistor D4.The second voltage source 142 provides second voltage signal via the 3rd power discharging device G3 to electrode 150, should
Second voltage signal with the gap between breakdown electrode 150 and workpiece and can establish discharge channel, so as to carry out galvanic corrosion to workpiece
Processing.The control that first power discharging device G1, the second power discharging device G2, the 3rd power discharging device G3 can be generated by drive circuit 114 respectively
Pulse signal CP1, CP2, CP3 processed are controlled.Specifically, first pulse signal CP1 on or off the first power discharging device G1 with
Control charging of the first voltage source 132 to inductance L, second pulse signal CP2 on or off the second power discharging device G2 is to control
First voltage signal from inductance L to electrode 150 is (for example, control first voltage signal is provided to the first bypass 136 or electrode
150), the power discharging device G3 of the 3rd pulse signal CP3 on or off the 3rd is to control second source circuit 140 to be carried to electrode 150
The second voltage signal of confession.
First voltage source 132, the first power discharging device G1, inductance L, transistor D2 form a constant-current source circuit.When second
Power discharging device G2 turn on when, inductive current I1 through the second power discharging device G2 flow to (or negative pole of first voltage source 132)；When
When two power discharging device G2 are turned off, inductive current I1 flows to electrode 150, to carry out electro-discharge machining to workpiece.Current feedback unit 134
It can detect and flow through inductance L electric current I1 during electro-discharge machining (or at any time), and current detection signal is supplied to
Drive circuit 114 is to adjust the first pulse signal CP1 pulsewidth and pulse spacing size, so as to control from first voltage source 132
The size of current (for example, in current setting signal Is range of tolerable variance) provided through inductance L.In addition, drive circuit 114 can be with
The machining voltage during electric machining between electrode 150 and workpiece is received (for example, passing through the current potential Va on receiving electrode 150
With the current potential Vb on workpiece, machining voltage=Va-Vb), and thus adjust the first pulse signal CP1 pulsewidth and the pulse spacing it is big
It is small, to control the size of machining voltage/electric current.
Inductance L is used to hinder curent change and power discharging device current limliting.In the exemplary embodiment, inductance L can be empty
Electrocardio sense, can reduce magnetic loss, and energy-saving effect is more preferable.Power discharging device G1-G3 can use the brilliant pipe of transistor, lock, FET,
Triode etc. is realized.Transistor D1-D4 can be realized with diode, transistor, FET etc..Those skilled in the art
It should be understood that Fig. 1 illustrate only exemplary components and the connection of electrical discharge machining pulse power 100, specific implementation can be new in this practicality
It is adjusted under the teaching of type without departing from the scope of the utility model, such as some components (for example, transistor D1-D4) can quilt
Being omitted or substituted into other has the element of identity function, and the position of some components can change (for example, inductance L, current feedback
The position of device 134 can exchange, and the position of each component in second source circuit 140 can also exchange).
Non-limiting as example, first voltage source 132 can be low-voltage dc power supply.For example, the electricity of first voltage source
Pressure can be 30-90V.In addition, as shown in fig. 1, it is connected between inductance L and the negative pole of first voltage source 132 (or ground connection)
Transistor D2, transistor D2 positive terminal are connected with the negative pole of workpiece and first voltage source 132, transistor D2 negative pole ends and inductance
L one end connects.When the first power discharging device G1 is turned off, transistor D2 can be used for inhaling negative pressure, be established by transistor D2 via electricity
Feel L continuous current circuit, the energy stored in inductance L can fully be discharged.Transistor D1 is located at power discharging device G2 and electrode
Between 150 and the tie point of second source circuit 140, it can prevent the second voltage signal of second source circuit 140 from sealing in first
Power circuit 130.
In second source circuit 140, in the 3rd pulse signal CP3 effectively (for example, high level) to cause the 3rd power amplifier
When device G3 is turned on, the second voltage source 142 provides second voltage signal via the 3rd power discharging device G3 to electrode 150, and this second
Voltage signal with the gap between breakdown electrode 150 and workpiece and can establish discharge channel, so as to carry out galvanic corrosion to workpiece.
The second voltage source 142 in second source circuit 140 can be high-voltage DC power supply.It is non-limiting as example, second voltage
The voltage in source 142 can be 160V-190V.Resistance R is used for the position of the current limliting of power discharging device, resistance R and the 3rd power discharging device G3
It can exchange.Transistor D4 positive terminal is connected with power discharging device G3, and negative pole end is connected with electrode 150, so as to prevent first
The first voltage signal of power circuit 130 is scurried into second source circuit 140.
Below in conjunction with the operation of the electrical discharge machining pulse power 100 of Fig. 2 next detailed key diagram 1 of oscillogram.
Current setting signal Is indicators are to flowing through inductance L electric current I1 setting value.Start pulse signal CP controls are whole
Individual edm process, such as electric machining is carried out when start pulse signal CP is effective, and it is invalid in start pulse signal CP
When stop electric machining.Start pulse signal CP can be adjustable square-wave signal.Start pulse signal CP can be set than electric current
Start after confidence Is delay specified time sections, to enable first voltage source 132 to fill inductance L before electric machining starts
Electricity is to predetermined voltage.
Drive circuit 114 generates periodic first pulse letter at current setting signal Is effectively (for example, high level)
Number CP1.As the first pulse signal CP1 conductings (constant conduction intermittently turns on) first power discharging device G1, first voltage
Source 132 is charged via the first power discharging device G1 to inductance L, flows through inductance L electric current I1 increases；When the first pulse signal CP1 is closed
During disconnected first power discharging device G1, the energy stored in inductance L is released, and electric current I1 reduces.From figure 2 it can be seen that the first electricity
The electric current I1 that inductance L is flowed through in source circuit 130 is fluctuated in the effective effectual times of current setting signal Is.Therefore, in electric current
The setting signal Is valid periods, first voltage source 132 periodically charges via the first power discharging device G1 to inductance L, so that electric
Feel average voltage or electric current that L remains predetermined.Drive circuit 114 can adjust the first arteries and veins according to current setting signal Is size
Signal CP1 pulsewidth and the pulse spacing is rushed, so as to control the size (average value) for the electric current I1 for flowing through inductance L.For example, it can control
System flows through inductance L electric current I1 in current setting signal Is predetermined tolerance.
Second pulse signal CP2 can be start pulse signal CP inversion signal.That is, it is effective in start pulse signal CP
When, the second pulse signal CP2 is invalid, so as to turn off the second power discharging device G2 so that inductance L electric current I1 can flow to electrode
150；When start pulse signal CP is invalid, the second pulse signal CP2 is effective, so as to turn on the second power discharging device G2 so that electricity
Sense L electric current I1 can flow to the first bypass 136, and electrode 150 is bypassed.
3rd pulse signal CP3 can be identical with start pulse signal CP.(for example, trigger pulse is believed in the period is processed
When number CP is effective), the 3rd pulse signal CP3 effectively (for example, high level) is to cause the 3rd power discharging device G3 to turn on, second voltage
Discharge channel is simultaneously established in gap of the source 142 between the 3rd power discharging device G3 breakdown electrodes 150 and workpiece；Meanwhile second arteries and veins
Rush signal CP2 it is invalid and turn off the second power discharging device G2, inductance L via optional transistor D1 to electrode 150 provide first electricity
Press signal.As described above, first voltage signal and second voltage signal maintain the electric discharge between electrode 150 and workpiece to lead to jointly
Road.When the first power circuit 130 and second source circuit 140 are powered to electrode 150 simultaneously, high processing electric current can be provided,
Such as highest processing electric current is up to 200A-600A.Due to the first pulse signal CP1 periodically amplifirers of on or off first
Part G1 turns on the first power discharging device G1 to control charging of the first voltage source 132 to inductance L in the first pulse signal CP1
When, first voltage source 132 charges to inductance L, electric current I increases；When the first pulse signal CP1 turns off the first power discharging device G1,
First voltage source 132 stops charging to inductance L, while inductance L powers to electrode 150, causes electric current I gradually gradually small；Subsequent
To be charged to inductance L when one pulse signal CP1 turns on the first power discharging device G1 again, electric current I increases, the rest may be inferred.
In working interval (for example, when start pulse signal CP, CP3 are invalid), the 3rd power discharging device G3 shut-offs, the second electricity
Potential source 142 stops providing voltage to electrode 150；Meanwhile second pulse signal CP2 effectively and turn on the second power discharging device G2 when,
Inductance L via the second power discharging device G2 be shorted to (and/or being shorted to the negative pole of first voltage source 132), thus inductance L stop
First voltage signal is provided to electrode 150.In addition, in the case where the second power discharging device G2 is connected to transistor D1 negative poles, the
Two power discharging device G2 are turned on after electro-discharge machining terminates, and the gap voltage during can making between arteries and veins is (between electrode 150 and workpiece
Voltage) zero is rapidly gone to, so as to accelerate deionization.
Thus, start pulse signal CP controls whole edm process, when start pulse signal CP is effective, first
Pulse signal CP1, the second pulse signal CP2 and the 3rd pulse signal CP3 control corresponding power discharging device G1, G2, G3 with to electricity
The power supply of pole 150 carries out electrical discharge machining.On the contrary, when start pulse signal CP is invalid, electrode 150 powers off, so as to without electricity
Spark is processed.From figure 2 it can be seen that electric current I start pulse signal CP it is invalid when be essentially 0.
According in alternative embodiment of the present utility model, the 3rd pulse signal CP3 may include in start pulse signal CP
Effectual time beginning short pulse.For example, the 3rd power discharging device G3 is turned on during the short pulse, and in the short pulse knot
Turned off after beam.Gap of the second source circuit 140 during the 3rd power discharging device G3 is turned between breakdown electrode 150 and workpiece is simultaneously
Establish discharge channel, subsequent second source circuit 140 is closed, and by the first power circuit 130 maintain electrode 150 and workpiece it
Between discharge channel.Thus, the ON time of second source circuit 140 can be shorter than start pulse signal CP effectual time,
So as to save.In addition, by making second source circuit 140 that there is shorter ON time, it can effectively control and put on electricity
Electric current on pole 150, so as to precisely control electrical discharge machining.
Fig. 3 shows the circuit diagram of the electrical discharge machining pulse power 300 according to another embodiment of the present utility model.
For clarity, Fig. 3 electrical discharge machining pulse power 300 component similar to Fig. 1 electrical discharge machining pulse power 100 and operation not
Repeat again.The difference of Fig. 3 electrical discharge machining pulse power 300 and Fig. 1 electrical discharge machining pulse power 100 is, the first power circuit
130 further comprise the second bypass 138.Non-limiting as example, the second bypass 138 can include the 4th power discharging device G4,
As shown in Figure 3.It will be understood by those skilled in the art that the second bypass 138 can include other components with switching function.With
Under illustrated by taking the 4th power discharging device G4 as an example, but not as restriction.4th power discharging device G4 one end be connected to inductance L with
Between transistor D1, the 4th power discharging device G4 other end is connected to the ground (and/or being connected to the negative pole of first voltage source 132).
In addition, drive circuit 114 also generates the 4th pulse signal CP4, to control the 4th power discharging device G4 ON/OFF.Tie below
Close the operation of the electrical discharge machining pulse power 300 of Fig. 4 next detailed key diagram 3 of oscillogram.
Current setting signal Is indicators are to flowing through inductance L electric current I1 setting value.Start pulse signal CP controls are whole
Individual edm process, such as electric machining is carried out when start pulse signal CP is effective, and it is invalid in start pulse signal CP
When stop electric machining.Start pulse signal CP can be adjustable square-wave signal.Start pulse signal CP can be set than electric current
Start after confidence Is delay specified time sections, to enable first voltage source 132 to fill inductance L before electric machining starts
Electricity is to predetermined voltage.Drive circuit 114 generates periodic first arteries and veins at current setting signal Is effectively (for example, high level)
Signal CP1 is rushed, it periodically turns on the first power discharging device G1, so that inductance L periodically charge/discharges.Second pulse is believed
Number CP2 can be start pulse signal CP inversion signal, and the 3rd pulse signal CP3 can be identical with start pulse signal CP.
4th pulse signal CP4 can be reversed to effectively, and in trigger pulse when start pulse signal CP is changed into invalid
It is changed into invalid after experience scheduled delay after signal CP is changed into effectively.Therefore, (for example, trigger pulse in the period is processed
When signal CP is effective), the 3rd pulse signal CP3 is changed into effective (for example, high level) to cause the 3rd power discharging device G3 to turn on, the
Discharge channel is simultaneously established in gap of two voltage sources 142 between the 3rd power discharging device G3 breakdown electrodes 150 and workpiece；Second arteries and veins
Rush signal CP2 it is invalid and turn off the second power discharging device G2；Meanwhile the 4th pulse signal CP4 in scheduled delay still to have
Effect so that the 4th power discharging device G4 is turned on, and inductance L (and/or is shorted to first voltage with being shorted to via the 4th power discharging device G4
The negative pole in source 132), thus inductance L does not provide first voltage signal to electrode 150.Figure 4, it is seen that make a reservation for prolong at this
In the slow time, discharge channel is simultaneously established in gap between the breakdown electrode 150 of the second voltage source 142 and workpiece, so as to there is small electric
Stream flow to workpiece from the second voltage source 142 through electrode 150.
After the scheduled delay, the 4th pulse signal CP4 is changed into invalid so that the 4th power discharging device G4 is turned off, electricity
Feel L and provide first voltage signal, gap current I2 increases to electrode 150 via optional transistor D1, therefore maintain electrode 150
Discharge channel between workpiece, and workpiece is processed.In the case where the 4th power discharging device G4 is delayed to turn off so that the
Two voltage sources 142 (can control the 4th power discharging device G4 to turn off it during the scheduled delay in the 4th pulse signal CP4
Before) discharge channel is established, avoid the 3rd power discharging device G3, the 4th power discharging device G4 and established in second source circuit 140 and discharged
Turned off before passage so as to the situation (voltage may be caused to rise) for causing inductance L current path to be blocked.Thereby, it is possible to standard
The machining voltage of true ground coordination electrode 150.
In working interval (for example, when start pulse signal CP is changed into invalid), the 3rd power discharging device G3 shut-offs, the second electricity
Potential source 142 stops providing voltage to electrode 150；Meanwhile second pulse signal CP2 effectively and turn on the second power discharging device G2, the
Four pulse signal CP4 are changed into effective and turn on the 4th power discharging device G4 conductings, and inductance L is via the 4th power discharging device G4 and/or the
Two power discharging device G2 be shorted to (and/or being shorted to the negative pole of first voltage source 132), thus inductance L stop carrying to electrode 150
For first voltage signal.Equally, the 3rd power discharging device G3 is turned on after electro-discharge machining terminates, and can make the gap electricity of period between arteries and veins
Pressure rapidly goes to zero, so as to accelerate deionization.
According in alternative embodiment of the present utility model, the 3rd pulse signal CP3 may include in start pulse signal CP
Effectual time beginning short pulse.For example, the 3rd power discharging device G3 is turned on during the short pulse, and in the short pulse knot
Turned off after beam.Gap of the second source circuit 140 during the 3rd power discharging device G3 is turned between breakdown electrode 150 and workpiece is simultaneously
Establish discharge channel, subsequent second source circuit 140 is closed, and by the first power circuit 130 maintain electrode 150 and workpiece it
Between discharge channel.Herein, the 3rd pulse signal CP3 should all be changed into nothing in the 3rd pulse signal CP3, the 4th pulse signal CP4
Terminate after effect (that is, the 3rd power discharging device G3, the 4th power discharging device G4 are all turned off, and thus make inductance L be powered to electrode 150),
So as to maintain the discharge channel between electrode 150 and workpiece by the first power circuit 130.
Fig. 5 shows the electrical discharge machining pulse power control method according to the embodiment of the utility model one.This method can be by such as
Upper reference picture 1 or electrical discharge machining pulse power 100 or 300 described by Fig. 3 perform.
This method may include in step 510, and start pulse signal and current setting signal are generated based on electric machining order.Example
Such as, microcontroller 112 can be based on electric machining order and produce adjustable start pulse signal CP and current setting signal Is.As
Example and it is non-limiting, start pulse signal CP can be 0.1us -1000us adjustable start pulse signal.
This method may additionally include step 520, and the first pulse signal is generated based on the current setting signal.For example, drive
Dynamic circuit 114 can be based on the current setting signal and generate the first pulse signal, with or off the first power discharging device G1 with
Control charging of the first voltage source 132 to inductance L.
This method may additionally include step 530, and the second pulse signal and the 3rd arteries and veins are generated based on the start pulse signal
Rush signal.
This method may additionally include step 540, the life under the control of first pulse signal using the first power circuit
Into first voltage signal.For example, second pulse signal CP2 on or off the second power discharging device G2 is to control first voltage signal
It is provided to the second power discharging device G2 or electrode 150.
This method may additionally include step 550, the life under the control of the 3rd pulse signal using second source circuit
Electrode is supplied into second voltage signal and by the second voltage signal.For example, the 3rd pulse signal CP3 on or off
Three power discharging device G3, to provide second voltage signal from the second voltage source 142 to electrode 150, so as to breakdown electrode 150 and workpiece
Between gap and establish discharge channel.
This method may additionally include step 560, selectively turns on or turns off under the control of second pulse signal
First bypass in parallel with the electrode, to control the first voltage signal to be provided to first bypass or the electricity
Pole.For example, the second pulse signal CP2 can be start pulse signal CP inversion signal.
This method may also include based on start pulse signal to generate the 4th pulse signal, to selectively turn on or turn off
Second bypass in parallel with electrode.For example, the second bypass 138 may include the 4th power discharging device G4, and the 4th pulse signal CP4 is led
Logical or the 4th power discharging device G4 of shut-off.On the one hand, the 4th pulse signal CP4 can be start pulse signal CP anti-phase letter
Number.On the other hand, the 4th pulse signal CP4 can be inverted to effectively when start pulse signal CP is changed into invalid with conducting the 4th
Power discharging device G4, and it is changed into after start pulse signal CP is changed into effective and delay scheduled time invalid to turn off the 4th amplifirer
Part G4.Non-limiting as example, the scheduled time can be 0-10us.
As above, the utility model provides a kind of new electrical discharge machining pulse power and processing unit (plant).The utility model passes through
First power circuit 130 and second source circuit 140 are used cooperatively, it is possible to increase the energy utilization of electrical discharge machining pulse power
Rate.For example, the capacity usage ratio of electrical discharge machining pulse power of the present utility model can reach 80%, with some existing electrical spark workings
Work power supply is compared to can improve more than 50%, so as to economize on electricity 50%.By using power discharging device, compared with traditional resistor power supply, electricity
Source fault rate significantly reduces, and can accomplish substantially non-maintaining.By selecting high power device and protection circuit, electricity can also be made
Source fault rate reduces.In addition, controlling the ON/OFF of each power discharging device in phase by using pulse signal, can make to add
Work electric current reaches 200A-600A, suitable for utilizing processing of the broad-area electrode to workpiece surface, improves the efficiency of electric machining.
Pass through the bypass changeover of power discharging device, it is possible to achieve electric current between electrode and workpiece improves work frequency without climbing and conditions of streaking
Rate；In parallel with electrode, workpiece by power discharging device, period gap voltage rapidly goes to zero between controlling its switch to realize arteries and veins,
So as to accelerate deionization.
Embodiment of the present utility model is described above in conjunction with accompanying drawing, but the utility model is not limited to
The embodiment stated, above-mentioned embodiment and cited specific numeral are only schematical, rather than
Restricted, one of ordinary skill in the art is not departing from the utility model aims and power under enlightenment of the present utility model
Profit is required under protected ambit, can also make many forms, these are belonged within the scope of protection of the utility model.
Claims (12)
- A kind of 1. electrical discharge machining pulse power, it is characterised in that including：Microcontroller, it is based on electric machining order generation start pulse signal and current setting signal；Drive circuit, it is based on the current setting signal and generates the first pulse signal and generated based on the start pulse signal Second pulse signal and the 3rd pulse signal；First power circuit, first power circuit generate first voltage signal under the control of first pulse signal；Second source circuit, the second source circuit generate second voltage signal under the control of the 3rd pulse signal； AndElectrode, the electrode are believed coupled to first power circuit and the second source circuit with receiving the first voltage Number and/or the second voltage signal,Wherein described first power circuit includes first bypass in parallel with the electrode, and first bypass is in second arteries and veins Rush under the control of signal selectively turn on or turn off with control the first voltage signal be provided to it is described first bypass or The electrode.
- 2. electrical discharge machining pulse power as claimed in claim 1, it is characterised in that first power circuit includes first voltage Source, the first power discharging device coupled to the first voltage source and the inductance coupled to first power discharging device, wherein institute The first power discharging device described in the first pulse signal on or off is stated to control charging of the first voltage source to the inductance.
- 3. electrical discharge machining pulse power as claimed in claim 2, it is characterised in that first power circuit also includes：Transistor, its positive pole is coupled to the inductance and negative couplings to the electrode；Second bypass, second bypass is in parallel with the described first bypass, wherein first bypass coupling is to the transistor Negative pole and second bypass coupling to the transistor positive pole,Wherein described drive circuit is based further on the start pulse signal to generate the 4th pulse signal, second bypass Selectively turn on or turn off under the control of the 4th pulse signal.
- 4. electrical discharge machining pulse power as claimed in claim 3, it is characterised in that first bypass includes the second amplifirer Part, wherein the second power discharging device described in the second pulse signal on or off, second bypass includes the 4th amplifirer Part, and the 4th power discharging device described in the 4th pulse signal on or off, and the second source circuit includes：The second voltage source；AndThe 3rd power discharging device being coupling between the second voltage source and the electrode, wherein the 3rd pulse signal turns on Or the 3rd power discharging device is turned off to provide institute to the electrode via the 3rd power discharging device from the second voltage source Second voltage signal is stated, the second voltage signal punctures the gap between the electrode and workpiece and establishes discharge channel.
- 5. the electrical discharge machining pulse power as any one of claim 2 to 4, it is characterised in thatFirst pulse signal is included in the cyclic pulse signal in the effectual time of the current setting signal, the week First power discharging device described in phase property pulse signal on or off to control charging of the first voltage source to the inductance,Second pulse signal is the inversion signal of the start pulse signal,3rd pulse signal is identical with the start pulse signal or the effectual time of the start pulse signal starts The short pulse at place.
- 6. electrical discharge machining pulse power as claimed in claim 4, it is characterised in that4th pulse signal is the inversion signal of the start pulse signal, or4th pulse signal is inverted to effectively when the start pulse signal is changed into invalid to turn on the 4th power amplifier Device, and it is changed into after the start pulse signal is changed into effective and delay scheduled time invalid to turn off the 4th amplifirer Part.
- 7. electrical discharge machining pulse power as claimed in claim 6, it is characterised in that the scheduled time is 0-10us.
- 8. electrical discharge machining pulse power as claimed in claim 4, it is characterised in that the 3rd pulse signal is the triggering arteries and veins The short pulse at the effectual time beginning of signal is rushed, the 3rd power discharging device turns on and described short during the short pulse Turned off after end-of-pulsing, the 4th pulse signal is inverted to when the start pulse signal is changed into invalid effectively to turn on The 4th power discharging device is stated, and when the start pulse signal is changed into effectively or afterwards and before the short pulse terminates It is changed into invalid to turn off the 4th power discharging device.
- 9. electrical discharge machining pulse power as claimed in claim 2, it is characterised in that the drive circuit further receives and flows through institute State the electric current of inductance and/or applied by the electrode to the voltage of workpiece, and adjusted according to the electric current and/or the voltage Save the pulsewidth and pulse spacing size of first pulse signal.
- 10. electrical discharge machining pulse power as claimed in claim 1, it is characterised in that the start pulse signal starts than institute State current setting signal delay preset time period.
- 11. electrical discharge machining pulse power as claimed in claim 4, it is characterised in that the start pulse signal be 0.1us- 1000us adjustable start pulse signal, the voltage of the first voltage source are 30-90V, the voltage of the second voltage source For 160V-190V.
- A kind of 12. electric discharge machining apparatus, it is characterised in that including：Electrical discharge machining pulse power as any one of claim 1 to 11；AndProcessing groove, the processing groove are used to fix workpiece and the shape between the electrode of the workpiece and the electrical discharge machining pulse power Into gap.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2016107893162 | 2016-08-31 | ||
| CN201610789316 | 2016-08-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107775127A (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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60229445D1 (en) * | 2002-07-12 | 2008-11-27 | Mitsubishi Electric Corp | VOLTAGE SOURCE FOR SPARK EROSION |
| JP4874358B2 (en) * | 2009-02-27 | 2012-02-15 | 株式会社ソディック | Power supply device for machining of Die-sinker EDM |
| JP5183827B1 (en) * | 2011-11-30 | 2013-04-17 | 三菱電機株式会社 | Electric discharge machine power supply |
| JP5389994B1 (en) * | 2012-08-08 | 2014-01-15 | 株式会社ソディック | Electric discharge machine |
| JP5414864B1 (en) * | 2012-09-18 | 2014-02-12 | 株式会社ソディック | Machining power supply for wire-cut electrical discharge machining equipment |
| CN202824897U (en) * | 2012-09-26 | 2013-03-27 | 苏州三特科技有限公司 | Improved electrical process machine pulsed power supply |
| US9446465B2 (en) * | 2012-10-30 | 2016-09-20 | Mitsubishi Electric Corporation | Wire electric-discharge machining apparatus |
| CN107775127B (en) * | 2016-08-31 | 2019-11-19 | 山东豪迈机械科技股份有限公司 | Electrical discharge machining pulse power and its control method |
-
2017
- 2017-03-13 CN CN201710147174.4A patent/CN107775127B/en active Active
- 2017-03-13 CN CN201720243983.0U patent/CN207026653U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107775127A (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 |
| CN107775127B (en) * | 2016-08-31 | 2019-11-19 | 山东豪迈机械科技股份有限公司 | Electrical discharge machining pulse power and its control method |
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| CN107775127A (en) | 2018-03-09 |
| CN107775127B (en) | 2019-11-19 |
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