CN112077406A - Micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting processing - Google Patents

Micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting processing Download PDF

Info

Publication number
CN112077406A
CN112077406A CN202010804729.XA CN202010804729A CN112077406A CN 112077406 A CN112077406 A CN 112077406A CN 202010804729 A CN202010804729 A CN 202010804729A CN 112077406 A CN112077406 A CN 112077406A
Authority
CN
China
Prior art keywords
power supply
circuit
gap
voltage
diode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010804729.XA
Other languages
Chinese (zh)
Other versions
CN112077406B (en
Inventor
杨飞
杨俊�
刘亚运
陈希岩
刘伟涵
史顺飞
孙金生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing University of Science and Technology
Original Assignee
Nanjing University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing University of Science and Technology filed Critical Nanjing University of Science and Technology
Priority to CN202010804729.XA priority Critical patent/CN112077406B/en
Publication of CN112077406A publication Critical patent/CN112077406A/en
Application granted granted Critical
Publication of CN112077406B publication Critical patent/CN112077406B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H11/00—Auxiliary apparatus or details, not otherwise provided for
    • 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
    • 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
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/02—Wire-cutting
    • 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
    • B23H2300/00—Power source circuits or energization

Abstract

The invention discloses a micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting machining, which comprises a main power circuit, a counter-voltage circuit, a detection circuit, an FPGA (field programmable gate array) control circuit and a driving circuit, wherein the main power circuit is used for charging a gap and providing discharge energy; the back-voltage circuit is used for increasing the voltage on the line impedance in the discharge machining stage and improving the current reduction rate; the detection circuit is used for acquiring voltage and current of the gap in real time, sampling and conditioning the voltage and current, and transmitting the sampled and conditioned voltage and current to the FPGA; the FPGA control circuit generates corresponding control signals according to the voltage and current changes of the gap; the driving circuit is used for amplifying the control signal and generating a driving signal to drive the switch tube in the main power circuit to be switched on and off. The back-pressure circuit is added behind the main power circuit, so that the reduction slope of the gap current in the gap discharge process is improved, the discharge current pulse width is reduced, the small-energy processing is realized, and the surface quality of a processed finished product is improved.

Description

Micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting processing
Technical Field
The invention relates to a micro-machining pulse power supply, in particular to a micro-energy pulse power supply for high-speed reciprocating wire-cut electrical discharge machining.
Background
The high-speed reciprocating wire-moving electric spark wire cutting machining mode (commonly called as 'fast wire moving') is an original electric spark wire cutting machining mode in China, and compared with a low-speed unidirectional wire-moving electric spark wire cutting machining mode (commonly called as 'slow wire moving') developed abroad, the high-speed reciprocating wire-moving electric spark wire cutting machining mode has the characteristics of low wire electrode loss and low machining cost. In the field of industrial manufacturing, China also applies the improvement of a high-speed reciprocating wire-feeding electrospark wire-electrode cutting machining mode to the actual electrospark wire-electrode cutting machining process, and creates a novel machining mode, wherein the machining mode mainly adopts a machining mode of cutting and repairing two, the first rough machining cutting is carried out, and then finish machining, repairing and micro-energy machining are carried out, and the method is also based on the high-speed reciprocating wire-feeding electrospark wire-electrode cutting machining mode and characteristics, and has the advantages of high machining efficiency, high precision, low cost, good surface quality and the like.
The pulse power supply is an important component of the wire cut electric discharge machine, and the quality of the performance of the pulse power supply directly influences the machining efficiency, the machining precision, the surface roughness, the cutting stability and the like. The current circuit topology adopted by most pulse power supplies has the problems of large discharge pulse width and overhigh discharge energy in a single period in the process of high-speed reciprocating wire-cut electrical discharge wire cutting, and particularly, the discharge pulse width is maintained at about 1 mu s for a long time in the process of repairing and machining by utilizing a high-speed reciprocating wire-cut electrical discharge wire cutting machining mode, so that the surface quality and the precision of a machined workpiece are not high.
Disclosure of Invention
The invention aims to provide a micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting machining.
The technical solution for realizing the purpose of the invention is as follows: a micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting machining comprises a main power circuit, a back-pressure circuit, a detection circuit, an FPGA control circuit and a driving circuit, wherein the main power circuit is used for charging a gap and providing discharge energy; the back-voltage circuit is used for increasing the voltage on the line impedance in the discharge machining stage and improving the current reduction rate; the detection circuit is used for acquiring voltage and current of the gap in real time, sampling and conditioning the voltage and current, and transmitting the sampled and conditioned voltage and current to the FPGA; the FPGA control circuit generates corresponding control signals according to the voltage and current changes of the gap; the driving circuit is used for amplifying the control signal and generating a driving signal to drive the switch tube in the main power circuit to be switched on and off.
The main power circuit comprises a first direct current power supply, a first switch tube, a second switch tube, a first diode, a second diode, a third diode and an inductor, the positive pole of the first direct current power supply is connected with one end of the first switch tube, the negative pole of the first direct current power supply is grounded, the other end of the first switch tube is connected with the inductor, the other end of the inductor is connected with the second switch tube, the positive pole of the first diode is connected with the negative pole of the first direct current power supply, the negative pole of the first diode is connected with the connection point of the first switch tube and the inductor, the positive pole of the second diode is connected with the connection point of the second switch tube and the first direct current power supply, the negative pole of the second diode is connected with the connection point of the first switch tube and the first direct current power supply, the positive pole of the third diode is connected with one end of the second switch tube, and the negative pole of the third diode is connected with the connection point of the second switch. And the connection point of the second switching tube and the anode of the third diode and the cathode of the first direct current power supply are respectively connected to two ends of the back voltage circuit.
The inverse voltage circuit comprises a second direct current power supply, a resistor, a capacitor, a fourth diode and a fifth diode, one end of a capacitor is connected with a connection point of an anode of a second switch tube and a third diode, an anode of a fifth diode is connected with a cathode of a first direct-current power supply, a cathode of the fifth diode is connected with the other end of the capacitor, one end of a resistor is connected with one end of the capacitor, the other end of the resistor is connected with the other end of the capacitor, a cathode of the second direct-current power supply is connected with a connection point of an anode of the second switch tube and the third diode, an anode of the second direct-current power supply is connected with an anode of a fourth diode, a cathode of the fourth diode is connected with a connection point of the capacitor, the connection point of the resistor and the cathode of the second direct-current power supply is connected with one end of a line inductor, and the other end of the line inductor and the cathode of the first direct-current power supply are respectively connected with.
The first switch tube and the second switch tube adopt SiC metal-oxide semiconductor field effect transistors (SiC MOSFETs), and the manufacturing material of the MOSFETs is SiC.
The driving circuit selects a driving chip which has high-end and low-end double-path driving and has an isolation characteristic.
A processing method based on the micro-energy pulse power supply comprises the following steps:
step 1: before processing is started, a first switching tube and a second switching tube of a main power circuit are controlled to be turned off, at the moment, a second direct-current power supply in a back-voltage circuit charges a capacitor through a fourth diode, energy on the capacitor rises, and until voltage on the capacitor rises to be equal to voltage at two ends of the direct-current power supply;
step 2: controlling the first switching tube and the second switching tube to be conducted, charging the line inductor and the gap by a first direct current power supply in the main power circuit at the moment, and when the gap voltage reaches breakdown voltage, breaking down the gap to start discharge machining;
and step 3: when the gap current rises to a given peak current, the first switching tube and the second switching tube are controlled to be turned off, at the moment, the direct-current power supply does not supply power to the gap any more, the gap current drops, the circuit is divided into two parts, and the inductor in the main power circuit feeds the accumulated energy back to the first direct-current power supply through the second diode; the voltage at two ends of the line inductor is raised by the conduction of a fifth diode in the back-voltage circuit, so that the reduction slope of the gap current is increased;
and 4, step 4: after the current discharge is finished, the current enters between processing pulses to carry out deionization;
and 5: and (5) repeating the steps 1-4, and carrying out the next processing period.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
step 1: before processing is started, a first switching tube and a second switching tube of a main power circuit are controlled to be turned off, at the moment, a second direct-current power supply in a back-voltage circuit charges a capacitor through a fourth diode, energy on the capacitor rises, and until voltage on the capacitor rises to be equal to voltage at two ends of the direct-current power supply;
step 2: controlling the first switching tube and the second switching tube to be conducted, charging the line inductor and the gap by a first direct current power supply in the main power circuit at the moment, and when the gap voltage reaches breakdown voltage, breaking down the gap to start discharge machining;
and step 3: when the gap current rises to a given peak current, the first switching tube and the second switching tube are controlled to be turned off, at the moment, the direct-current power supply does not supply power to the gap any more, the gap current drops, the circuit is divided into two parts, and the inductor in the main power circuit feeds the accumulated energy back to the first direct-current power supply through the second diode; the voltage at two ends of the line inductor is raised by the conduction of a fifth diode in the back-voltage circuit, so that the reduction slope of the gap current is increased;
and 4, step 4: after the current discharge is finished, the current enters between processing pulses to carry out deionization;
and 5: and (5) repeating the steps 1-4, and carrying out the next processing period.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
step 1: before processing is started, a first switching tube and a second switching tube of a main power circuit are controlled to be turned off, at the moment, a second direct-current power supply in a back-voltage circuit charges a capacitor through a fourth diode, energy on the capacitor rises, and until voltage on the capacitor rises to be equal to voltage at two ends of the direct-current power supply;
step 2: controlling the first switching tube and the second switching tube to be conducted, charging the line inductor and the gap by a first direct current power supply in the main power circuit at the moment, and when the gap voltage reaches breakdown voltage, breaking down the gap to start discharge machining;
and step 3: when the gap current rises to a given peak current, the first switching tube and the second switching tube are controlled to be turned off, at the moment, the direct-current power supply does not supply power to the gap any more, the gap current drops, the circuit is divided into two parts, and the inductor in the main power circuit feeds the accumulated energy back to the first direct-current power supply through the second diode; the voltage at two ends of the line inductor is raised by the conduction of a fifth diode in the back-voltage circuit, so that the reduction slope of the gap current is increased;
and 4, step 4: after the current discharge is finished, the current enters between processing pulses to carry out deionization;
and 5: and (5) repeating the steps 1-4, and carrying out the next processing period.
Compared with the prior art, the invention has the following remarkable advantages: 1) the back-pressure circuit is added behind the main power circuit, so that the reduction slope of the gap current in the gap discharge process is improved, the discharge current pulse width is reduced, the small-energy processing is realized, and the surface quality of a processed finished product is improved; 2) diodes are reversely connected in parallel at two ends of the inductor and the switching tube in the main power circuit, so that energy stored in the inductor can be fed back to a direct-current power supply in the processing process, and the electric energy utilization rate is improved; 3) the control circuit part adopts FPGA, can control parameters of different processing stages in a programmable way, changes the peak current and meets the requirements of different processing.
Drawings
FIG. 1 is a frame diagram of a micro-energy pulse power supply for high-speed reciprocating wire-cut electrical discharge machining according to the present invention.
FIG. 2 is a circuit topology diagram of the micro-energy pulse power supply for high-speed reciprocating wire-cut electrical discharge machining of the invention.
FIG. 3 is a block diagram of the detection circuit of the present invention.
Fig. 4 is an application schematic diagram of the driving chip of the present invention.
FIG. 5 is a schematic diagram showing the waveforms of gap voltage and gap current in high-speed reciprocating wire-cut electrical discharge machining.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the micro-energy pulse power supply for high-speed reciprocating wire-cut electrical discharge machining of the invention comprises a main power circuit, a counter-voltage circuit, a detection circuit, an FPGA control circuit and a drive circuit, wherein the main power circuit is used for charging a gap and providing discharge energy; the back-voltage circuit is used for increasing the voltage on the line impedance in the discharge machining stage and improving the current reduction rate; the detection circuit is used for acquiring voltage and current of the gap in real time; the FPGA control circuit generates corresponding control signals according to the voltage and current changes of the gap; the driving circuit is used for amplifying the control signal and generating a driving signal to drive the switch tube in the main power circuit to be switched on and off.
As shown in figure 2, the topological element of the micro-energy pulse power supply for high-speed reciprocating wire-cut electric discharge machining comprises a first direct current power supply V1A second DC power supply V2Resistor R, capacitor C, inductor L and line inductor LmA first switch tube Q1A second switch tube Q2A first diode D1A second diode D2A third diode D3A fourth diode D4And a fifth diode D5Wherein the first direct current power supply V1Inductor L and first switch tube Q1A second switch tube Q2A first diode D1A second diode D2And a third diode D3Forming a main power circuit, a second DC power supply V2Resistor R, capacitor C and fourth diode D4And a fifth diode D5Forming a back-voltage circuit. Wherein the first DC power supply V in the main power circuit1Positive electrode of (2) and first switching tube Q1Is connected to a first DC power supply V1The negative pole of the first switch tube Q is grounded1Is connected with an inductor L, and the other end of the inductor L is connected with a second switch tube Q2Connected by a first diode D1And a first direct current power supplyV1Is connected to the negative pole of the first diode D1Cathode and first switching tube Q1A second diode D connected to the junction of the inductor L2Anode and inductor L and second switching tube Q2Is connected to the connection point of a second diode D2And a first direct current power supply V1And a first switch tube Q1Is connected to the connection point of the third diode D3And a second switching tube Q2Is connected to one end of a third diode D3Cathode and inductor L and second switching tube Q2Are connected. Second switch tube Q2And a third diode D3And a first direct current source V1Respectively connected to both ends of the counter voltage circuit.
One end of a capacitor C in the counter-voltage circuit and a second switching tube Q2And a third diode D3Is connected to the connection point of the anode of a fifth diode D5And a first direct current power supply V1Is connected to the negative pole of a fifth diode D5The cathode of the first direct current power supply V is connected with the other end of the capacitor C, one end of the resistor R is connected with one end of the capacitor C, the other end of the resistor R is connected with the other end of the capacitor C, and the second direct current power supply V is connected with the cathode of the second direct current power supply V2Negative pole of (1) and second switch tube Q2And a third diode D3Is connected to the anode of a second DC power supply V2And a fourth diode D4Is connected to the anode of a fourth diode D4Cathode and capacitor C and fifth diode D5Is connected with the capacitor C, the resistor R and a second direct current power supply V2And line inductance LmIs connected to a line inductance LmAnd a first direct current power supply V1The negative electrodes of the two electrodes are respectively connected with the two ends of the gap.
In addition, a line inductance L exists on the line of the inverse voltage circuit and the gap connectionmFor convenience of description, the capacitor C and the line inductor L are definedmIs node a, a capacitor C and a fifth diode D5The node between the negative electrodes is node b, and a fifth diode D5The node at the positive electrode is node c.
As a toolBy way of example, for a switching tube in a circuit topology, a silicon carbide metal-oxide semiconductor field effect transistor (SiC MOSFET) may be selected. As the circuit topology is mainly used as a pulse power supply for high-speed reciprocating wire cut electrical discharge machining, the SiC MOSFET (silicon-on-insulator) of the Infineon company with the model number of IMW120R090M1H is selected, and the drain-source voltage V of the SiC MOSFET is VDSUp to 250V, drain current IDThe pulse power supply is 19A, and can be applied to the occasions of high-speed reciprocating wire-cut electric discharge machining pulse power supplies with high working frequency.
The detection circuit is used for accurately detecting and collecting gap current and voltage in real time, performing digital-to-analog conversion on the gap current and voltage, and transmitting the gap current and voltage to the FPGA control circuit for analysis and drive control. Fig. 3 shows an example of a detection circuit, where the gap voltage and the gap current are converted into standard signals to be detected after sampling and conditioning the signals, the signals to be detected pass through a uniform interface and then pass through an attenuation circuit to meet the input requirements of a digital-to-analog conversion chip, and finally the converted data are transmitted in parallel to a corresponding interface of the FPGA.
The FPGA control circuit is mainly controlled by an FPGA (field programmable gate array), and because a corresponding control circuit structure is integrated inside the FPGA control circuit, a driving signal corresponding to a switching tube can be automatically obtained through program operation, and meanwhile, the current requirements of different processing stages can be met by utilizing program control. As a specific example, a Cyclone IV series chip EP4CE6F17C8 from ALTERA may be used.
For the driving circuit, a driving chip with high-low end dual-path driving and isolation characteristics can be selected, the driving chip is selected from Texas Instruments (Texas electronics) with a model of UCC21520, as shown in fig. 4, the chip has high-low end dual-path driving and is an isolated dual-path gate driving chip, and the chip can be suitable for a high-frequency switching tube and has high stability and high efficiency.
In the processing process, a main power circuit, a counter voltage circuit, a detection circuit, an FPGA control circuit and a driving circuit in the pulse power supply are combined into a whole and act on two ends of a workpiece and a tool,the gap current is controlled. The gap current waveform during machining is shown in fig. 5. At 0 to t1In the stage, a first direct current power supply charges the gap, the voltage on the gap continuously rises, and meanwhile, a certain leakage current exists in the gap; at t1～t2In the stage, the gap is broken down, the discharge machining is started, the gap voltage is rapidly reduced from the breakdown voltage to the spark maintaining voltage, and the current is increased to a certain peak current with a certain slope; at t2～t3In the stage, the pulse voltage is closed, the pulse current is also rapidly reduced to zero along with the reduction of the pulse voltage to zero, and the reduction rate of the pulse current is faster due to the existence of the counter-voltage circuit; at t3And entering a deionization phase after the moment until one processing cycle is finished.
The processing method based on the micro-energy pulse power supply comprises the following specific processes:
step 1: before processing is started, a first switching tube and a second switching tube of a main power circuit are controlled to be turned off, at the moment, a second direct-current power supply in a back-voltage circuit charges a capacitor through a fourth diode, energy on the capacitor rises, and until voltage on the capacitor rises to be equal to voltage at two ends of the direct-current power supply;
step 2: controlling the first switching tube and the second switching tube to be conducted, charging the line inductor and the gap by a first direct current power supply in the main power circuit at the moment, and when the gap voltage reaches breakdown voltage, breaking down the gap to start discharge machining;
and step 3: when the gap current rises to a given peak current, the first switching tube and the second switching tube are controlled to be turned off, at the moment, the direct-current power supply does not supply power to the gap any more, the gap current drops, the circuit is divided into two parts, and the inductor in the main power circuit feeds the accumulated energy back to the first direct-current power supply through the second diode; the voltage at two ends of the line inductor is raised by the conduction of a fifth diode in the back-voltage circuit, so that the reduction slope of the gap current is increased;
and 4, step 4: after the current discharge is finished, the current enters between processing pulses to carry out deionization;
and 5: and (5) repeating the steps 1-4, and carrying out the next processing period.
The present invention also provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:
step 1: before processing is started, a first switching tube and a second switching tube of a main power circuit are controlled to be turned off, at the moment, a second direct-current power supply in a back-voltage circuit charges a capacitor through a fourth diode, energy on the capacitor rises, and until voltage on the capacitor rises to be equal to voltage at two ends of the direct-current power supply;
step 2: controlling the first switching tube and the second switching tube to be conducted, charging the line inductor and the gap by a first direct current power supply in the main power circuit at the moment, and when the gap voltage reaches breakdown voltage, breaking down the gap to start discharge machining;
and step 3: when the gap current rises to a given peak current, the first switching tube and the second switching tube are controlled to be turned off, at the moment, the direct-current power supply does not supply power to the gap any more, the gap current drops, the circuit is divided into two parts, and the inductor in the main power circuit feeds the accumulated energy back to the first direct-current power supply through the second diode; the voltage at two ends of the line inductor is raised by the conduction of a fifth diode in the back-voltage circuit, so that the reduction slope of the gap current is increased;
and 4, step 4: after the current discharge is finished, the current enters between processing pulses to carry out deionization;
and 5: and (5) repeating the steps 1-4, and carrying out the next processing period.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
step 1: before processing is started, a first switching tube and a second switching tube of a main power circuit are controlled to be turned off, at the moment, a second direct-current power supply in a back-voltage circuit charges a capacitor through a fourth diode, energy on the capacitor rises, and until voltage on the capacitor rises to be equal to voltage at two ends of the direct-current power supply;
step 2: controlling the first switching tube and the second switching tube to be conducted, charging the line inductor and the gap by a first direct current power supply in the main power circuit at the moment, and when the gap voltage reaches breakdown voltage, breaking down the gap to start discharge machining;
and step 3: when the gap current rises to a given peak current, the first switching tube and the second switching tube are controlled to be turned off, at the moment, the direct-current power supply does not supply power to the gap any more, the gap current drops, the circuit is divided into two parts, and the inductor in the main power circuit feeds the accumulated energy back to the first direct-current power supply through the second diode; the voltage at two ends of the line inductor is raised by the conduction of a fifth diode in the back-voltage circuit, so that the reduction slope of the gap current is increased;
and 4, step 4: after the current discharge is finished, the current enters between processing pulses to carry out deionization;
and 5: and (5) repeating the steps 1-4, and carrying out the next processing period.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (8)

1. A micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting machining is characterized by comprising a main power circuit, a counter-voltage circuit, a detection circuit, an FPGA control circuit and a driving circuit, wherein the main power circuit is used for charging a gap and providing discharge energy; the back-voltage circuit is used for increasing the voltage on the line impedance in the discharge machining stage and improving the current reduction rate; the detection circuit is used for acquiring voltage and current of the gap in real time, sampling and conditioning the voltage and current, and transmitting the sampled and conditioned voltage and current to the FPGA; the FPGA control circuit generates corresponding control signals according to the voltage and current changes of the gap; the driving circuit is used for amplifying the control signal and generating a driving signal to drive the switch tube in the main power circuit to be switched on and off.
2. Micro-energy pulse power supply for high-speed reciprocating wire-cut electrical discharge machining according to claim 1, characterized in that the main power circuit comprises a first direct current power supply (V)1) A first switch tube (Q)1) A second switch tube (Q)2) A first diode (D)1) A second diode (D)2) And a third diode (D)3) And an inductance (L), wherein the first direct current source (V)1) Positive electrode and first switching tube (Q)1) Is connected to a first direct current power supply (V)1) Is grounded, the first switching tube (Q)1) Is connected with an inductor (L), and the other end of the inductor (L) is connected with a second switch tube (Q)2) Connected, a first diode (D)1) And a first direct current power supply (V)1) Is connected to the negative pole of the first diode (D)1) And a first switching tube (Q)1) A second diode (D) connected to the junction of the inductor (L)2) And an inductor (L) and a second switching tube (Q)2) Is connected to the connection point of a second diode (D)2) And a first direct current power supply (V)1) And a first switch tube (Q)1) Is connected to the connection point of the third diode (D)3) And a second switching tube (Q)2) Is connected to one terminal of a third diode (D)3) And a second switch tube (Q) and an inductor (L)2) Are connected. Second switch tube (Q)2) And a third diode (D)3) And a first direct current power supply (V)1) Respectively connected to both ends of the counter voltage circuit.
3. The micro-energy pulse power supply for high speed reciprocating wire electrical discharge machining according to claim 1, wherein the back pressure circuit comprisesA second DC power supply (V)2) A resistor (R), a capacitor (C), a fourth diode (D)4) And a fifth diode (D)5) Wherein one end of the capacitor (C) and the second switch tube (Q)2) And a third diode (D)3) Is connected to the connection point of the anode of a fifth diode (D)5) And a first direct current power supply (V)1) Is connected to the negative pole of a fifth diode (D)5) Is connected with the other end of the capacitor (C), one end of the resistor (R) is connected with one end of the capacitor (C), the other end of the resistor (R) is connected with the other end of the capacitor (C), and a second direct current power supply (V)2) Negative pole of (1) and second switching tube (Q)2) And a third diode (D)3) Is connected to the anode of a second direct current power supply (V)2) And a fourth diode (D)4) Is connected to the anode of a fourth diode (D)4) And a capacitor (C) and a fifth diode (D)5) Is connected with the capacitor (C), the resistor (R) and a second direct current power supply (V)2) And line inductance (L) of the negative pole ofm) Is connected to a line inductance (L)m) And a first direct current power supply (V)1) The negative electrodes of the two electrodes are respectively connected with the two ends of the gap.
4. Micro-energy pulse power supply for high-speed reciprocating wire-cut electrical discharge machining according to claim 1, characterized in that the first switching tube (Q)1) A second switch tube (Q)2) The SiC metal-oxide semiconductor field effect transistor SiC MOSFET is adopted, and the manufacturing material is SiC.
5. The micro-energy pulse power supply for high-speed reciprocating wire-cut electrical discharge machining according to claim 1, wherein the driving circuit selects a driving chip with high-low end double-path driving and isolation characteristics.
6. The machining method of the micro-energy pulse power supply for the high-speed reciprocating wire-cut electric discharge machining according to any one of claims 1 to 5, characterized by comprising the following steps:
step 1:before starting the machining, the first switch tube (Q) of the main power circuit is controlled1) And a second switching tube (Q)2) Is turned off when the second DC power supply (V) in the back-voltage circuit2) Through a fourth diode (D)4) Charging the capacitor (C) and increasing the energy on the capacitor (C) until the voltage on the capacitor (C) rises to the DC power supply (V)2) The voltages at the two ends are equal;
step 2: controlling the first switching tube (Q)1) And a second switching tube (Q)2) Is turned on when the first DC power supply (V) in the main power circuit is turned on1) Supply line inductance (L)m) And gap charging, when the gap voltage reaches the breakdown voltage, the gap is broken down, and the discharge machining is started;
and step 3: when the gap current rises to a given peak current, the first switching tube (Q) is controlled1) And a second switching tube (Q)2) Turn off, at which time the DC power supply (V)1) The gap current drops when the gap is no longer supplied, the circuit is divided into two parts, and the inductor (L) in the main power circuit passes the accumulated energy through the second diode (D)2) Fed back to the first DC power supply (V)1) The above step (1); fifth diode (D) in the counter-voltage circuit5) The conduction raises the line inductance (L)m) The voltage at the two ends enables the gap current to decrease with an increased slope;
and 4, step 4: after the current discharge is finished, the current enters between processing pulses to carry out deionization;
and 5: and (5) repeating the steps 1-4, and carrying out the next processing period.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
step 1: before starting the machining, the first switch tube (Q) of the main power circuit is controlled1) And a second switching tube (Q)2) Is turned off when the second DC power supply (V) in the back-voltage circuit2) Through a fourth diode (D)4) Charging the capacitor (C) and the energy on the capacitor (C) rises until the voltage on the capacitor (C) risesTo a direct current power supply (V)2) The voltages at the two ends are equal;
step 2: controlling the first switching tube (Q)1) And a second switching tube (Q)2) Is turned on when the first DC power supply (V) in the main power circuit is turned on1) Supply line inductance (L)m) And gap charging, when the gap voltage reaches the breakdown voltage, the gap is broken down, and the discharge machining is started;
and step 3: when the gap current rises to a given peak current, the first switching tube (Q) is controlled1) And a second switching tube (Q)2) Turn off, at which time the DC power supply (V)1) The gap current drops when the gap is no longer supplied, the circuit is divided into two parts, and the inductor (L) in the main power circuit passes the accumulated energy through the second diode (D)2) Fed back to the first DC power supply (V)1) The above step (1); fifth diode (D) in the counter-voltage circuit5) The conduction raises the line inductance (L)m) The voltage at the two ends enables the gap current to decrease with an increased slope;
and 4, step 4: after the current discharge is finished, the current enters between processing pulses to carry out deionization;
and 5: and (5) repeating the steps 1-4, and carrying out the next processing period.
8. A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
step 1: before starting the machining, the first switch tube (Q) of the main power circuit is controlled1) And a second switching tube (Q)2) Is turned off when the second DC power supply (V) in the back-voltage circuit2) Through a fourth diode (D)4) Charging the capacitor (C) and increasing the energy on the capacitor (C) until the voltage on the capacitor (C) rises to the DC power supply (V)2) The voltages at the two ends are equal;
step 2: controlling the first switching tube (Q)1) And a second switching tube (Q)2) Is turned on when the first DC power supply (V) in the main power circuit is turned on1) Supply line inductance (L)m) And gap charging, when the gap voltage reaches the breakdown voltage, the gap is broken down, and the process is startedPerforming electric discharge machining;
and step 3: when the gap current rises to a given peak current, the first switching tube (Q) is controlled1) And a second switching tube (Q)2) Turn off, at which time the DC power supply (V)1) The gap current drops when the gap is no longer supplied, the circuit is divided into two parts, and the inductor (L) in the main power circuit passes the accumulated energy through the second diode (D)2) Fed back to the first DC power supply (V)1) The above step (1); fifth diode (D) in the counter-voltage circuit5) The conduction raises the line inductance (L)m) The voltage at the two ends enables the gap current to decrease with an increased slope;
and 4, step 4: after the current discharge is finished, the current enters between processing pulses to carry out deionization;
and 5: and (5) repeating the steps 1-4, and carrying out the next processing period.
CN202010804729.XA 2020-08-12 2020-08-12 Micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting processing Active CN112077406B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010804729.XA CN112077406B (en) 2020-08-12 2020-08-12 Micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting processing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010804729.XA CN112077406B (en) 2020-08-12 2020-08-12 Micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting processing

Publications (2)

Publication Number Publication Date
CN112077406A true CN112077406A (en) 2020-12-15
CN112077406B CN112077406B (en) 2022-06-28

Family

ID=73727849

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010804729.XA Active CN112077406B (en) 2020-08-12 2020-08-12 Micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting processing

Country Status (1)

Country Link
CN (1) CN112077406B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114523166A (en) * 2021-12-31 2022-05-24 苏州市宝玛数控设备有限公司 Control system and method of pulse power supply for reciprocating wire-moving electric spark wire-electrode cutting machine tool

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1035072A (en) * 1987-12-18 1989-08-30 北京市电加工研究所 Dc pulse energy saving power source for electrical processing
CN108380988A (en) * 2018-01-30 2018-08-10 南京理工大学 A kind of WEDM pulse power supply and its control method
CN108672858A (en) * 2018-06-30 2018-10-19 南京理工大学 The bipolarity WEDM pulse power supply and processing method of full-bridge crisscross parallel
CN111277138A (en) * 2019-12-31 2020-06-12 南京理工大学 Medium-speed wire cutting pulse power supply for processing waist drum problem and processing method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1035072A (en) * 1987-12-18 1989-08-30 北京市电加工研究所 Dc pulse energy saving power source for electrical processing
CN108380988A (en) * 2018-01-30 2018-08-10 南京理工大学 A kind of WEDM pulse power supply and its control method
CN108672858A (en) * 2018-06-30 2018-10-19 南京理工大学 The bipolarity WEDM pulse power supply and processing method of full-bridge crisscross parallel
CN111277138A (en) * 2019-12-31 2020-06-12 南京理工大学 Medium-speed wire cutting pulse power supply for processing waist drum problem and processing method thereof

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
于学文等: "高性能电火花线切割脉冲电源的研究", 《电子工艺技术》, no. 09, pages 12 - 16 *
张鑫: "数控线切割的常用工艺方法探析", 《冶金管理》, no. 09, 15 May 2020 (2020-05-15), pages 57 *
徐春柳等: "Boost-Marx型高压脉冲电源设计", 《电力电子技术》, no. 04, 20 April 2020 (2020-04-20), pages 1 - 3 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114523166A (en) * 2021-12-31 2022-05-24 苏州市宝玛数控设备有限公司 Control system and method of pulse power supply for reciprocating wire-moving electric spark wire-electrode cutting machine tool
CN114523166B (en) * 2021-12-31 2023-09-08 苏州市宝玛数控设备有限公司 Control system and method of pulse power supply for reciprocating wire-moving wire-cut electric discharge machine

Also Published As

Publication number Publication date
CN112077406B (en) 2022-06-28

Similar Documents

Publication Publication Date Title
CN112636592B (en) Novel single-cycle control method of electric spark pulse power supply
CN107276405B (en) The fine electric spark pulse power and Discrete control method based on the power supply
CN111193428B (en) Micro high-frequency grouping pulse power supply
CN111644718B (en) Pulse power supply for smooth machining of medium-speed wire cutting and machining method thereof
CN111277138B (en) Medium-speed wire cutting pulse power supply for processing waist drum problem and processing method thereof
CN108672858B (en) Full-bridge staggered parallel bipolar wire cut electrical discharge machining pulse power supply and machining method
CN110328419B (en) Non-resistance electric spark pulse power supply and machining and gap discharge state identification method thereof
CN111464005B (en) SiC power tube driving circuit with active crosstalk suppression function and control method
CN112077406B (en) Micro-energy pulse power supply for high-speed reciprocating wire-moving electric spark wire cutting processing
CN108723531B (en) Constant current probability pulse power supply controlled by spark wire cutting pulse-to-pulse or pulse width PID
CN109894691A (en) A kind of composite pulse power supply for ultrasonic edm processing
CN113857594A (en) Grouping type micro electric spark machining pulse power supply
CN113878183A (en) Multi-mode self-adaptive pulse power supply for electric spark machining of multilayer materials
CN111431431A (en) Anti-electrolysis high-low voltage composite micro pulse power supply
CN112620842B (en) Flyback pulse power supply for wire cut electrical discharge machining
CN115070142B (en) Novel peak current control method applied to electric spark machining pulse power supply
CN114888373A (en) Three-level BUCK pulse power supply for electric spark machining
CN107332459B (en) Nanosecond pulse power supply system for wire-cut electric discharge machining and control method
CN111293921B (en) Adjustable RC (resistor-capacitor) micro pulse power supply based on three-way capacitor staggered discharge
CN1144641C (en) Power supply for electrodischarge machining
CN112234810B (en) Novel SiC MOSFET oscillation suppression circuit applied to half-bridge circuit
CN115070143A (en) Four-switch Buck-Boost forming processing pulse power supply and control method thereof
CN107695470B (en) Intelligent high-speed energy-saving wire-electrode cutting high-frequency pulse power supply
CN114024463B (en) Novel pulse width compensation current sharing control method for medium-voltage wire-feeding pulse power supply
CN111431432A (en) Fine electric spark pulse power supply based on Boost and RC circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant