CN107552904B - A kind of processing power source and processing method for metal-ceramic functionally graded material progress electrical discharge machining - Google Patents
A kind of processing power source and processing method for metal-ceramic functionally graded material progress electrical discharge machining Download PDFInfo
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Abstract
A kind of processing power source and processing method for metal-ceramic functionally graded material progress electrical discharge machining；Belong to spark erosion technique field.Solving existing electric discharge machining apparatus, processing efficiency is low, and the problem of can only be processed in the form of Sing plus.The present invention realizes the highly-efficient processing to metal-ceramic functionally graded material by the design of processing major loop and control loop；Major loop includes high-low voltage selection circuit and capacitance selection circuit, and the formulation for the different electric discharge strategies of processing unit (plant) of the present invention provides biggish selection space；Controller using CPLD pulse control module as processing unit (plant) pulse, it is at low cost, control program program be easy to write and safeguard, detection system flexibility it is larger.Present invention is mainly used for the materials to multilayer to carry out electrical discharge machining.
Description
Technical field
The invention belongs to spark erosion technique fields.
Background technique
In recent years, metal-ceramic functionally graded material is due to its unique structure and performance advantage, in space flight, nuclear energy, life
It is used widely in the fields such as object.However, the processing of metal-ceramic functionally graded material is always a disaster of manufacturing field
Point.Main cause: cermet functionally graded material complicated component mainly includes metal component, metal-base composites ingredient
And ceramic composition, meanwhile, which incrementally increases from metal component to ceramic composition hardness.Therefore, the traditional machines such as grinding, turning
Tool processing method is difficult to realize the highly-efficient processing of metal-ceramic functionally graded material.
For the big problem of metal-base composites and Machining of Ceramics hardness, domestic and foreign scholars propose many solutions
Method, wherein electrical discharge machining is more common a solution.Electric discharge machining method is one kind of special process method,
Compared to Conventional machining methods, maximum advantage is noncontact processing.Electrical discharge machining material be by workpiece and
Continuously sparking electric discharge between tool achievees the purpose that ablation material.Electrode and tool do not occur directly to contact, therefore, electrical fire
Flower processing is not limited by the hardness of material, is very suitable to the processing of metal-base composites and ceramic material.The country is to above-mentioned
The electrical discharge machining of material has done many researchs, specifically includes that Harbin Institute of Technology on " Procedia CIRP "
"Surface Properties of SiCp/Al Composite by Powder-Mixed EDM"；China University Of Petroleum Beijing exists
" insulation and weakly conducting engineering ceramics electric spark milling Combined Machining Technology and mechanism study " on " mechanical engineering journal ".This
Outside, the patent of Publication No. CN102642057A discloses a kind of dedicated miniature electro-discharge machining of PCD/CBN/ hard alloy/cutter
Power supply solves the problems, such as that existing power supply is bulky, power consumption is big.These researchs are main to concentrate metal-base composites or ceramics
Processing technology, process principle and power volume of material etc. solve above-mentioned material from different perspectives to a certain extent and add
Work problem.
Compared to studies in China, foreign countries are mainly from electrode material, the metal-base composites of different proportion and processing power source arteries and veins
Three aspect expansion of shape are rushed, specifically include that Tokyo Univ Japan in " Journal of Materials Processing
Technology " on " Effect of electrode material on electrical discharge
machining of alumina"；Ren Ji university of South Korea is on " Materials and Manufacturing Processes "
" 15-35vol%SiCp/Al of Electrical discharge machining of functionally graded
composites"；" Influence of the pulse shape on of the Belgian Univ Louvain on " CIRP Annals "
the EDM performance of Si3N4-TiN ceramic composite".Pass through electrode material, different proportion material
The system research of influence of the research and pulse shape of processing characteristics to Ceramic manufacturing, improves the processing efficiency of material really,
But research is still only confined to metal-base composites or ceramic material, control method is still very simple off-line type.
Above general character also resides in: research contents is only confined to metal-base composites or ceramic material, not by the two
Combine consideration.Due to the difference of metal-base composites and ceramic material structure, necessarily lead to the difference of processing performance, it is single
One of pure research is necessarily unable to satisfy the processing request of metal-ceramic functionally graded material.The research of power supply is only confined to
Offline parameter setting, there is no realization real-time status to detect and control, and homogenous material is still received, but for metal-
Ceramic functionally graded material uses single offline machined parameters, is unable to satisfy the requirement of metal-ceramic functional material highly-efficient processing.
In consideration of it, targetedly carried out metal-ceramic functionally graded material electrical discharge machining high-efficient power device with
The efficiency of metal-ceramic functionally graded material electrical discharge machining not only can be improved in the research of method, and golden to China is promoted
The processing of category-ceramics functionally graded material and application level are significant.
Summary of the invention
The present invention is that in order to solve existing electric discharge machining apparatus, processing efficiency is low, and can only be carried out in the form of Sing plus
The problem of processing, is unable to satisfy the processing to metal-ceramic functionally graded material, and the present invention provides one kind for metal-
Ceramic functionally graded material carries out the processing power source and processing method of electrical discharge machining.
A kind of processing power source for metal-ceramic functionally graded material progress electrical discharge machining, it includes electric discharge inspection
Survey module, CPLD pulse control module, drive module, high-low voltage selection circuit and capacitance selection circuit；
Discharge examination module is also used to treat processing department for the discharge condition signal between detecting electrode and parts to be machined
Each layer of part is identified；Parts to be machined is metal-ceramic functionally graded material, and is followed successively by metal layer, ladder from top to bottom
Spend layer and ceramic layer；
The control signal output of discharge examination module is connect with the control signal input of CPLD pulse control module,
The pulse control signal output end of CPLD pulse control module and the pulse control signal input terminal of drive module connect；
Drive module is used to carry out received control signal isolation and power amplification, the high pressure gating signal of drive module
The high pressure gating signal input terminal of output end and high-low voltage selection circuit connects, the low pressure gating signal output end of drive module with
The low pressure gating signal input terminal of high-low voltage selection circuit connects, the high-voltage driven signal output end and capacitance selection of drive module
The high-voltage driven signal input terminal of circuit connects, the low voltage drive signal output end of drive module and the low pressure of capacitance selection circuit
Driving signal input connection；
High-low voltage selection circuit, for providing power supply to capacitance selection circuit；
The positive power output end of capacitance selection circuit is connect with electrode；
The positive negative sense power output end of capacitance selection circuit is connect with parts to be machined；And electrode is opposite with parts to be machined
Setting.
Preferably, the high-low voltage selection circuit includes high voltage power supply E1, low-tension supply E2, resistance R1, resistance
R2, diode D1, diode D2, NPN type metal-oxide-semiconductor MgWith NPN type metal-oxide-semiconductor Md；
The anode of high voltage power supply E1 is connect with one end of resistance R1, and the other end of resistance R1 and the anode of diode D1 connect
It connects, the cathode and NPN type metal-oxide-semiconductor M of diode D1gDrain electrode connection, NPN type metal-oxide-semiconductor MgSource electrode and NPN type metal-oxide-semiconductor MdSource
Pole connection, NPN type metal-oxide-semiconductor MgGrid and drive module high pressure gating signal output end connect；
The anode of low-tension supply E2 is connect with one end of resistance R2, and the other end of resistance R2 and the anode of diode D2 connect
It connects, the cathode and NPN type metal-oxide-semiconductor M of diode D2dDrain electrode connection, NPN type metal-oxide-semiconductor MdGrid and drive module low pressure select
The connection of messenger output end；
NPN type metal-oxide-semiconductor MgForward voltage output end of the source electrode as high-low voltage selection circuit；
The cathode of high voltage power supply E1 and the cathode of low-tension supply E2 connect simultaneously, and as the negative of high-low voltage selection circuit
To voltage output end.
Preferably, the capacitance selection circuit includes processing capacitor C1, high-energy capacitor C2, NPN type metal-oxide-semiconductor Mc1And NPN
Type metal-oxide-semiconductor Mc2；
Process one end and the NPN type metal-oxide-semiconductor M of capacitor C1gSource electrode, high-energy capacitor C2 one end and electrode one end simultaneously
Connection；
Process the other end and NPN type metal-oxide-semiconductor M of capacitor C1c1Drain electrode connection, NPN type metal-oxide-semiconductor Mc1Source electrode and NPN type
Metal-oxide-semiconductor Mc2Source electrode and parts to be machined connect simultaneously, NPN type metal-oxide-semiconductor Mc1Grid and drive module low voltage drive signal
Output end connection；
The other end and NPN type metal-oxide-semiconductor M of high-energy capacitor C2c2Drain electrode connection, NPN type metal-oxide-semiconductor Mc2Grid and driving
The high-voltage driven signal output end of module connects.
Described is a kind of for carrying out the processing power source of electrical discharge machining to metal-ceramic functionally graded material, further includes
State display module；
State display module is used for the working condition of driver module.
Preferably, the NPN type metal-oxide-semiconductor MgWith NPN type metal-oxide-semiconductor Mc2It is realized using IRFP460 model Mosfet.
Preferably, the NPN type metal-oxide-semiconductor MdWith NPN type metal-oxide-semiconductor Mc1It is realized using the Msofet of IRF840 model.
Preferably, the CPLD pulse control module is realized using EPM240 type programmable logic controller (PLC).
It is realized using a kind of processing power source for carrying out electrical discharge machining to metal-ceramic functionally graded material
Processing method, this method comprises the following steps:
Step 1: electrode is processed according to each layer of the preset discharge condition to parts to be machined, and CPLD pulse control
Discharge condition signal between the electrode that molding block is detected according to discharge examination module in real time and parts to be machined and to be added
Each layer of Ministry of worker's part is identified, corresponding control signal is generated, when discharge examination module detects parts to be machined gradient layer
In incomplete discharge signal when, CPLD pulse control module export high energy pulse control signal to drive module, to make electricity
High-voltage discharge is carried out between pole and parts to be machined；When discharge examination module detects the long pulse in parts to be machined ceramic layer
When discharge signal, pulse control signal is extended between CPLD pulse control module output arteries and veins, makes to carry out between electrode and parts to be machined
Electric discharge is extended between arteries and veins；
Step 2: drive module carries out isolation to the pulse control signal that CPLD pulse control module exports and power is put
Greatly, and the pulse control signal after isolation and power amplification carries out gating control to high-low voltage selection circuit and capacitance selection circuit
System, to change the discharge condition between electrode and parts to be machined, is finally completed to the processing to each layer of parts to be machined.
The present invention be directed to the variation of metal-ceramic functionally graded material component gradient, traditional electric spark power supply processing can not
It realizes and Processing Strategies is changed according to the machining state of heterogeneity, and there are problems that processing efficiency is low, the present invention is with efficient
Processing metal-ceramic functionally gradient is target, not according to metal-ceramic functionally graded material difference gradient components discharge condition
Together, different pulse control strategies is formulated using CPLD pulse control module, realizes metal-ceramic electric spark highly-efficient processing.
The invention has the beneficial effects that the present invention is realized by processing the design of major loop and control loop to gold
Category-ceramics functionally graded material highly-efficient processing；Major loop includes high-low voltage selection circuit and capacitance selection circuit, is this hair
The formulation of the different electric discharge strategies of bright processing unit (plant) provides biggish selection space；Using CPLD pulse control module as processing
The controller of device pulse, it is at low cost, control program program be easy to write and safeguard, detection system flexibility it is larger；For gold
Category-ceramics functionally graded material different layers, change pulse control mode in real time, greatly improve processing efficiency, and processing efficiency
Improve 30% or more.
Detailed description of the invention
Fig. 1 is the composite structural diagram of metal-ceramic functionally graded material；
Fig. 2 is the discharge waveform figure in metal-ceramic functionally graded material electrical spark working working hour；
Fig. 3 is of the present invention a kind of for carrying out the processing of electrical discharge machining to metal-ceramic functionally graded material
Power supply；
Fig. 4 is of the present invention a kind of for adding to metal-ceramic functionally graded material progress electrical discharge machining to utilize
The effect picture that work power supply controls machining state；(a) voltage between electrode and parts to be machined under electrion state
Waveform diagram；(b) voltage oscillogram between electrode and parts to be machined under pulse expansion discharge condition.
Specific embodiment
Specific embodiment 1: illustrate present embodiment referring to Fig. 1 and Fig. 3, one kind described in present embodiment for pair
Metal-ceramic functionally graded material carries out the processing power source of electrical discharge machining, it includes discharge examination module 1, CPLD pulse control
Molding block 2, drive module 3, high-low voltage selection circuit 5 and capacitance selection circuit 6；
Discharge examination module 1 is also used to for the discharge condition signal between detecting electrode 7 and parts to be machined 8 to be added
Each layer of Ministry of worker's part 8 is identified；Parts to be machined 8 is metal-ceramic functionally graded material, and is followed successively by metal from top to bottom
Layer, gradient layer and ceramic layer；
The control signal output of discharge examination module 1 is connect with the control signal input of CPLD pulse control module 2,
The pulse control signal output end of CPLD pulse control module 2 is connect with the pulse control signal input terminal of drive module 3；
Drive module 3 is for carrying out isolation power amplification, the high pressure gating signal of drive module 3 to received control signal
The high pressure gating signal input terminal of output end and high-low voltage selection circuit 5 connects, the low pressure gating signal output end of drive module 3
Connect with the low pressure gating signal input terminal of high-low voltage selection circuit 5, the high-voltage driven signal output end and capacitor of drive module 3
The high-voltage driven signal input terminal of selection circuit 6 connects, the low voltage drive signal output end and capacitance selection circuit of drive module 3
6 low voltage drive signal input terminal connection；
High-low voltage selection circuit 5, for providing power supply to capacitance selection circuit 6；
The positive power output end of capacitance selection circuit 6 is connect with electrode 7；
The positive negative sense power output end of capacitance selection circuit 6 is connect with parts to be machined 8；And electrode 7 and parts to be machined 8
It is oppositely arranged.
Present embodiment passes through 1 real-time detection metal-ceramic functionally graded material difference discharge condition of discharge examination module
With the identification of different layers, pulse parameter is then adjusted according to each layer machining state in real time, realizes metal-ceramic functionally graded material
The highly-efficient processing of different layers, and then improve the processing efficiency of material entirety.
As shown in Fig. 2, the discharge condition of gradient layer and ceramic layer is broadly divided into three kinds of states: regular picture in the present embodiment
(a), not exclusively electric discharge (b) and long-pulse discharge (d).In above-mentioned three kinds of discharge conditions, regular picture (a) is required in processing
Discharge condition, not exclusively discharge (b) and long-pulse discharge (d) are abnormal electric discharge, should be eliminated as far as possible in process.Needle
To abnormal discharge condition, processing unit (plant) of the present invention is use up by expansion time (e) between control high-voltage discharge time (c) and arteries and veins
The above-mentioned incomplete electric discharge (b) of elimination respectively of amount and long-pulse discharge (d) improve processing conditions, improve to metal-ceramic function
The processing efficiency of functionally gradient material (FGM).
Specific embodiment 2: illustrating present embodiment, present embodiment and specific embodiment one referring to Fig. 1 and Fig. 3
A kind of processing power source difference for carrying out electrical discharge machining to metal-ceramic functionally graded material is, described
High-low voltage selection circuit 5 include high voltage power supply E1, low-tension supply E2, resistance R1, resistance R2, diode D1, diode D2,
NPN type metal-oxide-semiconductor MgWith NPN type metal-oxide-semiconductor Md；
The anode of high voltage power supply E1 is connect with one end of resistance R1, and the other end of resistance R1 and the anode of diode D1 connect
It connects, the cathode and NPN type metal-oxide-semiconductor M of diode D1gDrain electrode connection, NPN type metal-oxide-semiconductor MgSource electrode and NPN type metal-oxide-semiconductor MdSource
Pole connection, NPN type metal-oxide-semiconductor MgGrid connect with the high pressure gating signal output end of drive module 3；
The anode of low-tension supply E2 is connect with one end of resistance R2, and the other end of resistance R2 and the anode of diode D2 connect
It connects, the cathode and NPN type metal-oxide-semiconductor M of diode D2dDrain electrode connection, NPN type metal-oxide-semiconductor MdGrid and drive module 3 low pressure
The connection of gating signal output end；
NPN type metal-oxide-semiconductor MgForward voltage output end of the source electrode as high-low voltage selection circuit 5；
The cathode of high voltage power supply E1 and the cathode of low-tension supply E2 connect simultaneously, and as high-low voltage selection circuit 5
Negative voltage output end.
Specific embodiment 3: illustrating present embodiment, present embodiment and specific embodiment two referring to Fig. 1 and Fig. 3
A kind of processing power source for carrying out electrical discharge machining to metal-ceramic functionally graded material, which is distinguished, to be, the electricity
Holding selection circuit 6 includes processing capacitor C1, high-energy capacitor C2, NPN type metal-oxide-semiconductor Mc1With NPN type metal-oxide-semiconductor Mc2；
Process one end and the NPN type metal-oxide-semiconductor M of capacitor C1gSource electrode, high-energy capacitor C2 one end and electrode 7 one end it is same
When connect；
Process the other end and NPN type metal-oxide-semiconductor M of capacitor C1c1Drain electrode connection, NPN type metal-oxide-semiconductor Mc1Source electrode and NPN type
Metal-oxide-semiconductor Mc2Source electrode and parts to be machined 8 connect simultaneously, NPN type metal-oxide-semiconductor Mc1Grid and drive module 3 low-voltage driving believe
The connection of number output end；
The other end and NPN type metal-oxide-semiconductor M of high-energy capacitor C2c2Drain electrode connection, NPN type metal-oxide-semiconductor Mc2Grid and driving
The high-voltage driven signal output end of module 3 connects.
In present embodiment,
1) CPLD pulse control module 2 issues signal according to discharge examination module 1, judges the pulse for needing to issue in next step
State；
When machining state is in regular picture state (a), CPLD pulse control module 2 is to high-low voltage selection circuit 5
Low pressure gating, high pressure shutdown signal are issued, while issuing gating processing capacitor C1 to capacitance selection circuit 6, closes high-energy capacitor
C2 signal；
When machining state is not exclusively electric discharge when (b), CPLD pulse control module 2 is sent out to high-low voltage selection circuit 5
Low pressure closing, high pressure opening signal out, while being issued to capacitance selection circuit 6 and closing processing capacitor C1, open high-energy capacitor C2
Signal；
When machining state is long-pulse discharge (d), CPLD pulse control module 2 issues pulse to capacitance selection circuit 6
Low tension loop is opened, high tension loop signal is closed.
2) drive module 3 carries out Phototube Coupling and power amplification to the signal that CPLD pulse control module 2 issues, and then will
Amplified signal is transmitted to the driving end of each NPN type metal-oxide-semiconductor, drives different NPN type metal-oxide-semiconductor on-off according to control signal.
When machining state is in regular picture state (a), drive module 3 can be issued according to CPLD pulse control module 2
Control signal, open low pressure NPN type metal-oxide-semiconductor Md, close high pressure NPN type metal-oxide-semiconductor Mg, open processing capacitor MC1, close high energy
Capacitor MC2；
When processing generates not exclusively electric discharge (b) in gradient layer, drive module 3 can be according to CPLD pulse control module 2
The control signal of sending can close low pressure NPN type metal-oxide-semiconductor Md, open high pressure NPN type metal-oxide-semiconductor Mg, close processing capacitor MC1, open
High-energy capacitor MC2, generate high-voltage discharge waveform (c)；
When processing generates long-pulse discharge (d) in ceramic layer, drive module 3 can open low pressure NPN in a pulsed fashion
Type metal-oxide-semiconductor Md, close high pressure NPN type metal-oxide-semiconductor Mg, open processing capacitor MC1, close high-energy capacitor MC2, generate spreading wave form between arteries and veins
(e)。
As shown in figure 4, one kind described in the present embodiment is used to carry out electrical discharge machining to metal-ceramic functionally graded material
Processing power source, under different discharge conditions, the result figure of real-time control discharge condition, it can be seen that when at present be incomplete
When electric discharge, processing unit (plant) of the present invention can realize high-voltage discharge by controlling the on-off of high tension loop, such as scheme shown in (a), together
When by (b) figure can be seen that processing unit (plant) of the present invention may be implemented to extend between real-time arteries and veins.
Specific embodiment 4: illustrating present embodiment referring to Fig. 3, described in present embodiment and specific embodiment one
A kind of processing power source difference for carrying out electrical discharge machining to metal-ceramic functionally graded material is, further includes that state is aobvious
Show module 4；
State display module 4 is used for the working condition of driver module 3.
Specific embodiment 5: illustrating present embodiment, present embodiment and described in specific embodiment three one referring to Fig. 3
It plants and is for the difference of the processing power source to metal-ceramic functionally graded material progress electrical discharge machining, the NPN type
Metal-oxide-semiconductor MgWith NPN type metal-oxide-semiconductor Mc2It is realized using IRFP460 model Mosfet.
Specific embodiment 6: illustrating present embodiment, present embodiment and described in specific embodiment three one referring to Fig. 3
It plants and is for the difference of the processing power source to metal-ceramic functionally graded material progress electrical discharge machining, the NPN type MOS
Pipe MdWith NPN type metal-oxide-semiconductor Mc1It is realized using the Msofet of IRF840 model.
Specific embodiment 7: illustrating present embodiment, present embodiment and described in specific embodiment one one referring to Fig. 3
It plants and is for the difference of the processing power source to metal-ceramic functionally graded material progress electrical discharge machining, the CPLD pulse
Control module 2 is realized using EPM240 type programmable logic controller (PLC).
Specific embodiment 8: illustrate present embodiment referring to Fig. 3, using one kind described in specific embodiment one for pair
Metal-ceramic functionally graded material carries out the processing method that the processing power source of electrical discharge machining is realized, this method includes following step
It is rapid:
Step 1: electrode 7 is processed according to each layer of the preset discharge condition to parts to be machined 8, and CPLD pulse
Control module 2 in real time according between the electrode 7 detected of discharge examination module 1 and parts to be machined 8 discharge condition signal and
Each layer of parts to be machined 8 is identified, corresponding control signal is generated, when discharge examination module 1 detects the Ministry of worker to be added
When incomplete discharge signal in 8 gradient layer of part, CPLD pulse control module 2 exports high energy pulse and controls signal to drive module
3, to make to carry out high-voltage discharge between electrode 7 and parts to be machined 8；When discharge examination module 1 detects that parts to be machined 8 is made pottery
When long-pulse discharge signal in enamel coating, CPLD pulse control module 2 extends pulse control signal between exporting arteries and veins, make electrode 7 with
It carries out extending electric discharge between arteries and veins between parts to be machined 8；
Step 2: the pulse control signal that drive module 3 exports CPLD pulse control module 2 carries out isolation and power is put
Greatly, and the pulse control signal after isolation and power amplification gates high-low voltage selection circuit 5 and capacitance selection circuit 6
Control, to change the discharge condition between electrode 7 and parts to be machined 8, is finally completed and adds to each layer of parts to be machined 8
Work.
It is of the present invention a kind of for carrying out the knot of the processing power source of electrical discharge machining to metal-ceramic functionally graded material
Structure is not limited to specific structure documented by the respective embodiments described above, can also be the spy of technology documented by the respective embodiments described above
The reasonable combination of sign.
Claims (7)
1. a kind of for carrying out the processing power source of electrical discharge machining to metal-ceramic functionally graded material, which is characterized in that it is wrapped
Include discharge examination module (1), CPLD pulse control module (2), drive module (3), high-low voltage selection circuit (5) and capacitor choosing
Select circuit (6)；
Discharge examination module (1) is also used to treat for the discharge condition signal between detecting electrode (7) and parts to be machined (8)
Each layer of processing component (8) is identified；Parts to be machined (8) is metal-ceramic functionally graded material, and from top to bottom successively
For metal layer, gradient layer and ceramic layer；
The control signal output of discharge examination module (1) is connect with the control signal input of CPLD pulse control module (2),
The pulse control signal output end of CPLD pulse control module (2) is connect with the pulse control signal input terminal of drive module (3)；
Drive module (3) is used to carry out received control signal isolation and power amplification, and the high pressure of drive module (3) gates letter
Number output end and the high pressure gating signal input terminal of high-low voltage selection circuit (5) connect, the low pressure gating signal of drive module (3)
Output end and the low pressure gating signal input terminal of high-low voltage selection circuit (5) connect, and the high-voltage driven signal of drive module (3) is defeated
Outlet is connect with the high-voltage driven signal input terminal of capacitance selection circuit (6), the low voltage drive signal output end of drive module (3)
It is connect with the low voltage drive signal input terminal of capacitance selection circuit (6)；
High-low voltage selection circuit (5), for providing power supply to capacitance selection circuit (6)；
The positive power output end of capacitance selection circuit (6) is connect with electrode (7)；
The positive negative sense power output end of capacitance selection circuit (6) is connect with parts to be machined (8)；And electrode (7) and the Ministry of worker to be added
Part (8) is oppositely arranged；
The high-low voltage selection circuit (5) includes high voltage power supply E1, low-tension supply E2, resistance R1, resistance R2, diode
D1, diode D2, NPN type metal-oxide-semiconductor MgWith NPN type metal-oxide-semiconductor Md；
The anode of high voltage power supply E1 is connect with one end of resistance R1, and the other end of resistance R1 is connect with the anode of diode D1, and two
The cathode and NPN type metal-oxide-semiconductor M of pole pipe D1gDrain electrode connection, NPN type metal-oxide-semiconductor MgSource electrode and NPN type metal-oxide-semiconductor MdSource electrode connect
It connects, NPN type metal-oxide-semiconductor MgGrid connect with the high pressure gating signal output end of drive module (3)；
The anode of low-tension supply E2 is connect with one end of resistance R2, and the other end of resistance R2 is connect with the anode of diode D2, and two
The cathode and NPN type metal-oxide-semiconductor M of pole pipe D2dDrain electrode connection, NPN type metal-oxide-semiconductor MdGrid and drive module (3) low pressure gate
Signal output end connection；
NPN type metal-oxide-semiconductor MgForward voltage output end of the source electrode as high-low voltage selection circuit (5)；
The cathode of high voltage power supply E1 and the cathode of low-tension supply E2 connect simultaneously, and as the negative of high-low voltage selection circuit (5)
To voltage output end.
2. according to claim 1 a kind of for carrying out the processing of electrical discharge machining to metal-ceramic functionally graded material
Power supply, which is characterized in that the capacitance selection circuit (6) includes processing capacitor C1, high-energy capacitor C2, NPN type metal-oxide-semiconductor Mc1With
NPN type metal-oxide-semiconductor Mc2；
Process one end and the NPN type metal-oxide-semiconductor M of capacitor C1gSource electrode, one end of high-energy capacitor C2 and one end of electrode (7) connect simultaneously
It connects；
Process the other end and NPN type metal-oxide-semiconductor M of capacitor C1c1Drain electrode connection, NPN type metal-oxide-semiconductor Mc1Source electrode and NPN type metal-oxide-semiconductor
Mc2Source electrode and parts to be machined (8) connect simultaneously, NPN type metal-oxide-semiconductor Mc1Grid and drive module (3) low-voltage driving believe
The connection of number output end；
The other end and NPN type metal-oxide-semiconductor M of high-energy capacitor C2c2Drain electrode connection, NPN type metal-oxide-semiconductor Mc2Grid and drive module
(3) high-voltage driven signal output end connection.
3. according to claim 1 a kind of for carrying out the processing of electrical discharge machining to metal-ceramic functionally graded material
Power supply, which is characterized in that further include state display module (4)；
State display module (4) is used for the working condition of driver module (3).
4. according to claim 2 a kind of for carrying out the processing of electrical discharge machining to metal-ceramic functionally graded material
Power supply, which is characterized in that the NPN type metal-oxide-semiconductor MgWith NPN type metal-oxide-semiconductor Mc2It is realized using IRFP460 model Mosfet.
5. according to claim 2 a kind of for carrying out the processing of electrical discharge machining to metal-ceramic functionally graded material
Power supply, which is characterized in that the NPN type metal-oxide-semiconductor MdWith NPN type metal-oxide-semiconductor Mc1It is realized using the Msofet of IRF840 model.
6. according to claim 1 a kind of for carrying out the processing of electrical discharge machining to metal-ceramic functionally graded material
Power supply, which is characterized in that the CPLD pulse control module (2) is realized using EPM240 type programmable logic controller (PLC).
7. using described in claim 1 a kind of for carrying out the processing of electrical discharge machining to metal-ceramic functionally graded material
The processing method that power supply is realized, which is characterized in that this method comprises the following steps:
Step 1: electrode (7) is processed according to each layer of the preset discharge condition to parts to be machined (8), and CPLD pulse
Control module (2) is in real time according to the electric discharge shape between discharge examination module (1) electrode (7) detected and parts to be machined (8)
State signal and each layer of parts to be machined (8) is identified, generate corresponding control signal, when discharge examination module (1) is examined
When measuring the incomplete discharge signal in parts to be machined (8) gradient layer, CPLD pulse control module (2) exports high energy pulse control
Signal processed is to drive module (3), to make to carry out high-voltage discharge between electrode (7) and parts to be machined (8)；When discharge examination mould
When block (1) detects the long-pulse discharge signal in parts to be machined (8) ceramic layer, CPLD pulse control module (2) exports arteries and veins
Between extend pulse control signal, make between electrode (7) and parts to be machined (8) carry out arteries and veins between extend electric discharge；
Step 2: the pulse control signal that drive module (3) exports CPLD pulse control module (2) carries out isolation and power is put
Greatly, and the pulse control signal after isolation and power amplification carries out high-low voltage selection circuit (5) and capacitance selection circuit (6)
Gating control, to change the discharge condition between electrode (7) and parts to be machined (8), is finally completed to parts to be machined (8)
The processing of each layer.
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