CN218745353U - Double-discharge loop power supply for electric spark machining - Google Patents
Double-discharge loop power supply for electric spark machining Download PDFInfo
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- CN218745353U CN218745353U CN202223126118.8U CN202223126118U CN218745353U CN 218745353 U CN218745353 U CN 218745353U CN 202223126118 U CN202223126118 U CN 202223126118U CN 218745353 U CN218745353 U CN 218745353U
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Abstract
The utility model relates to a double-discharge loop power supply for electric spark machining, which comprises a pulse generator, a first discharge loop and a second discharge loop which is the same as the first discharge loop; the pulse output end of the pulse generator is respectively connected with the controlled ends of the first discharging loop and the second discharging loop; connecting a workpiece to be electrospark machined to one pole of direct current voltage; one end of the first discharging loop is connected to the other pole of the direct-current voltage, and one end of the second discharging loop is connected to the other pole of the direct-current voltage; the other end of the first discharge loop is used for connecting a first electrode of the electric spark machining equipment, and the other end of the second discharge loop is used for connecting a second electrode of the electric spark machining equipment; the pulse generator is used for controlling the on-off of the first discharging loop and the second discharging loop by pulse voltage; the utility model discloses can improve the roughness's of work piece two sides uniformity.
Description
Technical Field
The utility model relates to an electrical discharge machining power technical field, concretely relates to two discharge circuit power for electrical discharge machining.
Background
During electric spark machining, one pole of a pulse power supply is connected with a tool electrode, the other pole of the pulse power supply is connected with a workpiece electrode, and the two poles of the pulse power supply are immersed in a liquid medium with certain insulation degree. The tool electrode is controlled by an automatic feeding adjusting device to ensure that a very small discharge gap is maintained between the tool and the workpiece during normal processing, and the discharge gap is generally 0.01-0.05 mm. When pulse voltage is applied between the electrodes, the liquid medium at the closest point between the electrodes under the current condition is broken down to form a discharge channel. Because the sectional area of the channel is very small, the discharge time is very short, so that the energy is highly concentrated and can reach 10-107W/mm, and the instantaneous high temperature generated in the discharge area is enough to melt and even evaporate the material, so that a small pit is formed. After the first pulse discharge is finished, a short interval is passed, and the second pulse is in breakdown discharge at the closest point between the electrodes. The high frequency is repeated in this way, the tool electrode is continuously fed to the workpiece, and the shape of the tool electrode is finally copied on the workpiece to form the required machining surface. At the same time, a small fraction of the total energy is also released onto the tool electrode, causing tool wear.
The electric spark machining technology plays an important role in semiconductor materials, super-hard and super-soft materials, micro-nano machining and large mirror surface machining. With the continuous development of modern industry, the requirements on high quality, high precision and high efficiency of the electric spark machining technology are put forward.
In the existing electric spark power supply technology, when two processing surfaces of a workpiece to be processed are processed simultaneously, a high-frequency power supply is adopted to output two same high-frequency pulse voltages respectively, the two high-frequency pulse voltages are applied to electrodes on two surfaces of the workpiece to be processed respectively, although the pulse voltages connected to the two electrodes can be adjusted, the two pulse voltages can be synchronized and equal as much as possible, the two pulse voltages are always two, and the pulse voltages on the two electrodes can not be completely kept consistent when the two processing surfaces of the workpiece to be processed are processed. The quality of the two surfaces of the machined part is also different.
SUMMERY OF THE UTILITY MODEL
In order to solve current electric spark power technology, when letting two pulse voltage insert respectively the electrode of waiting to process two machined surfaces of work piece, the pulse voltage on two electrodes on two surfaces of the work piece of waiting to process can't be guaranteed completely and technical problem such as keep unanimous, the utility model provides a two return circuit power that discharge for electric spark machining.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
a double-discharge loop power supply for electric spark machining comprises a pulse generator, a first discharge loop and a second discharge loop which is the same as the first discharge loop; the pulse output end of the pulse generator is respectively connected with the controlled ends of the first discharging loop and the second discharging loop; connecting a workpiece to be electrosparking into one pole of direct current voltage; one end of the first discharging loop is connected to the other pole of the direct-current voltage, and one end of the second discharging loop is connected to the other pole of the direct-current voltage;
the other end of the first discharge loop is used for being connected with a first electrode of electric spark machining equipment, and the other end of the second discharge loop is used for being connected with a second electrode of the electric spark machining equipment;
the pulse generator is used for controlling the on-off of the first discharging loop and the second discharging loop by using the pulse voltage output by the pulse output end.
The utility model discloses a theory of operation: the first discharge loop and the second discharge loop are intermittently connected under the control of pulse voltage, so that the pulse discharge duration is extremely short, and the workpiece is melted by heat generated during discharge to realize electric spark machining.
The utility model has the advantages that: the electrodes on the two sides of the workpiece to be machined are controlled by the same pulse voltage, and the machining loops on the two sides of the workpiece are the same, so that electric sparks generated by the electrodes on the two surfaces are good in synchronism, and the surface roughness of the two sides of the workpiece is high in consistency.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the first discharge circuit comprises a fourth resistor, a fifth resistor, a tenth resistor, a seventh resistor, an eleventh resistor, a third field effect transistor and a nineteenth resistor;
one end of the seventh resistor is used for being electrically connected with the first electrode; the other end of the seventh resistor is electrically connected with one end of the eleventh resistor and one end of the tenth resistor respectively, the other end of the tenth resistor is electrically connected with one end of the fourth resistor, the other end of the fourth resistor is connected with one pole of the direct-current voltage, the other end of the eleventh resistor is electrically connected with the drain electrode of the third field-effect tube, the source electrode of the third field-effect tube is connected with the other pole of the direct-current voltage, the grid electrode of the third field-effect tube is electrically connected with one end of the nineteenth resistor, and the other end of the nineteenth resistor is electrically connected with the pulse output end of the pulse generator.
Further, the pulse output end of the pulse generator comprises a forward pulse output end and a reverse pulse output end, the forward pulse output end is used for outputting forward pulse voltage, the reverse pulse output end is used for outputting reverse pulse voltage, and the other end of the nineteenth resistor is electrically connected with the forward pulse output end; the first discharge loop also comprises a first resistor and a first field effect transistor; one end of the first resistor is electrically connected with the other end of the fourth resistor, the other end of the first resistor is electrically connected with the drain electrode of the first field effect transistor, the source electrode of the first field effect transistor is electrically connected with the other end of the seventh resistor, and the grid electrode of the first field effect transistor is electrically connected with the reverse pulse output end.
The pulse generator adopting the further scheme has the advantages that the pulse generator outputting forward and reverse pulses can be used at the same time by arranging the reverse pulse control circuit, and the universality is improved.
Further, the positive pulse output end comprises a first positive pulse output end, a second positive pulse output end and a third positive pulse output end; the other end of the nineteenth resistor is electrically connected with the first positive pulse output end; the first discharge loop further comprises a twelfth resistor, a fourth field effect transistor, a thirteenth resistor, a fifth field effect transistor, a fourteenth resistor and a sixth field effect transistor; one end of the twelfth resistor, one end of the thirteenth resistor and one end of the fourteenth resistor are electrically connected with the other end of the seventh resistor; the drain electrode of the fourth field effect transistor is electrically connected with the other end of the twelfth resistor, the source electrode of the fourth field effect transistor is connected to the other electrode of the direct-current voltage, and the grid electrode of the fourth field effect transistor is electrically connected with the second positive pulse output end; the drain electrode of the fifth field effect transistor is electrically connected with the other end of the thirteenth resistor, the source electrode of the fifth field effect transistor is connected to the other electrode of the direct-current voltage, and the grid electrode of the fifth field effect transistor is electrically connected with the third forward pulse output end; the drain electrode of the sixth field effect transistor is electrically connected with the other end of the fourteenth resistor, the source electrode of the sixth field effect transistor is connected to the other electrode of the direct-current voltage, and the grid electrode of the sixth field effect transistor is electrically connected with the third forward pulse output end.
The beneficial effect of adopting above-mentioned further scheme is that through setting up multichannel pulse input circuit, can selectively insert pulse voltage, under different kinds of pulse input, realize multiple mode switch.
Further, the double-discharge loop power supply for electric spark machining also comprises a gap voltage sampling circuit, a current sampling circuit, a power supply voltage sampling circuit and a voltage frequency conversion circuit; the pulse generator is a single chip microcomputer, the input end of the gap voltage sampling circuit is electrically connected with the first discharging loop and the second discharging loop, the input end of the current sampling circuit is electrically connected with the first discharging loop and the second discharging loop, the input end of the power supply voltage sampling circuit is connected to one pole of the direct current voltage, and the output end of the gap voltage sampling circuit, the output end of the current sampling circuit and the output end of the power supply voltage sampling circuit are electrically connected with the input end of the single chip microcomputer;
the input end of the voltage frequency conversion circuit is electrically connected with the output end of the single chip microcomputer, and the output end of the voltage frequency conversion circuit is electrically connected with a control system of the electric spark machining equipment.
The beneficial effect of adopting above-mentioned further scheme is that, can sample the voltage and the electric current of discharge circuit through setting up clearance voltage sampling circuit, current sampling circuit and mains voltage sampling circuit, can master the behavior of discharge circuit, whether be in normal voltage and electric current working range promptly. By arranging the voltage frequency conversion circuit, a voltage signal fed back by the single chip microcomputer can be directly identified by a numerical control encoder of a control system of the electric spark machining equipment, and the feedback efficiency of the equipment is improved.
Further, the voltage frequency conversion circuit comprises a digital potentiometer, a first voltage frequency converter and a second voltage frequency converter, wherein the input end of the digital potentiometer is electrically connected with the output end of the single chip microcomputer, the output end of the digital potentiometer is electrically connected with the input end of the first voltage frequency converter and the input end of the second voltage frequency converter respectively, and the output end of the first voltage frequency converter and the output end of the second voltage frequency converter are electrically connected with the control system of the electric spark machining equipment.
Drawings
Fig. 1 is a first schematic circuit block diagram of the present invention;
FIG. 2 is a second schematic circuit block diagram of the present invention;
FIG. 3 is a circuit diagram of a first discharge circuit and a second discharge circuit;
FIG. 4 is a circuit diagram of a current sampling circuit;
FIG. 5 is a circuit diagram of a gap voltage sampling circuit;
FIG. 6 is a circuit diagram of a supply voltage sampling circuit;
fig. 7 is a circuit diagram of the voltage-frequency conversion circuit.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the present embodiment provides a dual discharge loop power supply for electrical discharge machining, which includes a pulse generator U11, a first discharge loop, a second discharge loop, a single chip microcomputer, a gap voltage sampling circuit, a current sampling circuit, a power supply voltage sampling circuit, and a voltage frequency conversion circuit; the pulse output end of the pulse generator U11 is respectively connected with the controlled ends of the first discharging loop and the second discharging loop; the workpiece to be subjected to electric spark machining, the signal input end of the first discharging loop and the input end of the second discharging loop are connected to the positive pole of direct-current voltage; the signal output end of the first discharging loop and the signal output end of the second discharging loop are both connected to the negative pole of the direct-current voltage or grounded; the input end of the first discharge loop is used for being connected with a first electrode of electric spark machining equipment, and the input end of the second discharge loop is used for being connected with a second electrode of the electric spark machining equipment; the pulse generator U11 is used for controlling the on-off of the first discharging loop and the second discharging loop by using the pulse voltage output by the pulse output end; the pulse generator U11 outputs the same pulse voltage to the first discharging loop and the second discharging loop to control the on-off of the first discharging loop and the second discharging loop; the first discharge loop is the same as the second discharge loop. The input of clearance voltage sampling circuit with first discharge circuit and the second is discharged the equal electricity in return circuit and is connected, current sampling circuit's input with first discharge circuit and the second is discharged the equal electricity in return circuit and is connected, supply voltage sampling circuit with impulse generator U11's direct current voltage output electricity is connected, clearance voltage sampling circuit's output current sampling circuit's output and supply voltage sampling circuit's output all with the input electricity of singlechip is connected.
The gap voltage sampling circuit is used for respectively collecting the voltage of the first discharging loop and the voltage of the second discharging loop and respectively transmitting the collected voltage of the first discharging loop and the collected voltage of the second discharging loop to the single chip microcomputer; the current sampling circuit is used for respectively collecting the current of the first discharging loop and the current of the second discharging loop and respectively transmitting the collected current of the first discharging loop and the collected current of the second discharging loop to the single chip microcomputer; the power supply voltage sampling circuit is used for collecting the voltage output by the direct-current voltage output end of the pulse generator U11 and transmitting the collected voltage output by the direct-current voltage output end of the pulse generator U11 to the single chip microcomputer. The gap voltage sampling circuit, the current sampling circuit and the power supply voltage sampling circuit are arranged to sample the voltage and the current of the discharge loop, and the working condition of the discharge loop, namely whether the working condition is in a normal voltage and current working range or not, can be mastered.
It should be noted that, the fact that the single chip microcomputer receives the voltage signal and sends the voltage signal is common general knowledge in the art, and the book "single chip microcomputer principle and application thereof" published by the university press of qinghua 2012 is referred to specifically, therefore, the present invention does not relate to the improvement of the computer program.
As shown in fig. 2, the workpiece to be electrospark machined, the signal input end of the first discharge loop and the input end of the second discharge loop are all connected to the negative pole of the direct-current voltage or grounded; and the signal output end of the first discharging loop and the signal output end of the second discharging loop are both connected to the positive pole of the direct-current voltage.
When one end of the first discharging loop is connected with the positive pole of the direct-current voltage, one end of the first discharging loop is a signal input end of the first discharging loop, and when one end of the second discharging loop is connected with the positive pole of the direct-current voltage, one end of the second discharging loop is a signal input end of the second discharging loop; the other end of the first discharging loop is a signal output end of the first discharging loop, and the other end of the second discharging loop is a signal output end of the second discharging loop.
When one end of the first discharging loop is connected with the negative pole of the direct-current voltage or grounded, one end of the first discharging loop is a signal output end of the first discharging loop, and when one end of the second discharging loop is connected with the negative pole of the direct-current voltage or grounded, one end of the second discharging loop is a signal output end of the second discharging loop; the other end of the first discharging loop is a signal input end of the first discharging loop, and the other end of the second discharging loop is a signal input end of the second discharging loop. As shown in fig. 3, the first discharge circuit includes a fourth resistor R4, a fifth resistor R5, a tenth resistor R10, a seventh resistor R7, an eleventh resistor R11, a third fet Q3, and a nineteenth resistor R19;
one end of the seventh resistor R7 is used for being electrically connected with the first electrode; the other end of the seventh resistor R7 is electrically connected to one end of the eleventh resistor R11 and one end of the tenth resistor R10, the other end of the tenth resistor R10 is electrically connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the positive electrode of the dc voltage, the other end of the eleventh resistor R11 is electrically connected to the drain of the third field-effect transistor Q3, the source of the third field-effect transistor Q3 is grounded or the negative electrode of the dc voltage, the gate of the third field-effect transistor Q3 is electrically connected to one end of the nineteenth resistor R19, and the other end of the nineteenth resistor R19 is electrically connected to the pulse output end of the pulse generator U11. Similarly, the other end of the fourth resistor R4 may also be connected to the negative electrode of the dc voltage or ground, and the source of the third field effect transistor Q3 may also be connected to the positive electrode of the dc voltage. The pulse output end of the pulse generator U11 comprises a forward pulse output end and a reverse pulse output end, the forward pulse output end is used for outputting forward pulse voltage, the reverse pulse output end is used for outputting reverse pulse voltage, and the other end of the nineteenth resistor R19 is electrically connected with the forward pulse output end; the first discharge loop further comprises a first resistor R1 and a first field effect transistor Q1; one end of the first resistor R1 is electrically connected with the other end of the fourth resistor R4, the other end of the first resistor R1 is electrically connected with the drain electrode of the first field-effect tube Q1, the source electrode of the first field-effect tube Q1 is electrically connected with the other end of the seventh resistor R7, and the grid electrode of the first field-effect tube Q1 is electrically connected with the reverse pulse output end.
The positive pulse output end comprises a first positive pulse output end, a second positive pulse output end and a third positive pulse output end; the other end of the nineteenth resistor R19 is electrically connected with the first positive pulse output end; the first discharging loop further comprises a twelfth resistor R12, a fourth field effect transistor Q4, a thirteenth resistor R13, a fifth field effect transistor Q5, a fourteenth resistor R14 and a sixth field effect transistor Q6; one end of the twelfth resistor R12, one end of the thirteenth resistor R13, and one end of the fourteenth resistor R14 are electrically connected to the other end of the seventh resistor R7; the drain electrode of the fourth field effect transistor Q4 is electrically connected with the other end of the twelfth resistor R12, the source electrode of the fourth field effect transistor Q4 is connected to the other electrode of the direct-current voltage, and the gate electrode of the fourth field effect transistor Q4 is electrically connected with the second forward pulse output end; the drain electrode of the fifth field-effect tube Q5 is electrically connected with the other end of the thirteenth resistor R13, the source electrode of the fifth field-effect tube Q5 is connected to the other electrode of the direct-current voltage, and the gate electrode of the fifth field-effect tube Q5 is electrically connected with the third forward pulse output end; the drain of the sixth field-effect transistor Q6 is electrically connected to the other end of the fourteenth resistor R14, the source of the sixth field-effect transistor Q6 is connected to the other end of the dc voltage, and the gate of the sixth field-effect transistor Q6 is electrically connected to the third forward pulse output terminal.
The first resistor R1 is the same as the second resistor R2, the fourth resistor R4 is the same as the third resistor R3, the fifth resistor R5 is the same as the sixth resistor R6, the tenth resistor R10 is the same as the ninth resistor R9, the fourteenth resistor R14 is the same as the fifteenth resistor R15, the thirteenth resistor R13 is the same as the sixteenth resistor R16, the twelfth resistor R12 is the same as the seventeenth resistor R17, the eleventh resistor R11 is the same as the eighteenth resistor R18, and the seventh resistor R7 is the same as the eighth resistor R8.
The second discharge loop comprises a third resistor R3, a sixth resistor R6, a ninth resistor R9, an eighth resistor R8, an eighteenth resistor R18, a tenth field-effect tube Q10, a nineteenth resistor R19, a second resistor R2, a second field-effect tube Q2, a seventeenth resistor R17, a ninth field-effect tube Q9, a sixteenth resistor R16, an eighth field-effect tube Q8, a fifteenth resistor R15 and a seventh field-effect tube Q7. The other end of the nineteenth resistor R19 is electrically connected with the first positive pulse output end; the first discharging circuit further comprises a seventeenth resistor R17, a ninth field-effect tube Q9, a sixteenth resistor R16, an eighth field-effect tube Q8, a fifteenth resistor R15 and a seventh field-effect tube Q7; one end of the seventeenth resistor R17, one end of the sixteenth resistor R16 and one end of the fifteenth resistor R15 are all electrically connected to the other end of the eighth resistor R8; the drain electrode of the ninth field-effect transistor Q9 is electrically connected with the other end of the seventeenth resistor R17, the source electrode of the ninth field-effect transistor Q9 is connected to the other electrode of the direct-current voltage, and the gate electrode of the ninth field-effect transistor Q9 is electrically connected with the second positive pulse output end; the drain electrode of the eighth field-effect transistor Q8 is electrically connected with the other end of the sixteenth resistor R16, the source electrode of the eighth field-effect transistor Q8 is connected to the other electrode of the direct-current voltage, and the gate electrode of the eighth field-effect transistor Q8 is electrically connected with the third forward pulse output end; the drain of the seventh field effect transistor Q7 is electrically connected to the other end of the fifteenth resistor R15, the source of the seventh field effect transistor Q7 is connected to the other end of the dc voltage, and the gate of the seventh field effect transistor Q7 is electrically connected to the third forward pulse output terminal.
One end of the eighth resistor R8 is used for electrically connecting with the first electrode; the other end of the eighth resistor R8 is respectively electrically connected to one end of the eighteenth resistor R18 and one end of the ninth resistor R9, the other end of the ninth resistor R9 is electrically connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to one pole of the direct current voltage, the other end of the eighteenth resistor R18 is electrically connected to the drain of the tenth field-effect tube Q10, the source of the tenth field-effect tube Q10 is connected to the other pole of the direct current voltage, the gate of the tenth field-effect tube Q10 is electrically connected to one end of the nineteenth resistor R19, and the other end of the nineteenth resistor R19 is electrically connected to the pulse output end of the pulse generator U11. Similarly, the other end of the third resistor R3 may also be connected to the negative electrode of the dc voltage or grounded, and the source of the tenth fet Q10 may also be connected to the positive electrode of the dc voltage.
The other end of the nineteenth resistor R19 is electrically connected with the positive pulse output end; the first discharge loop further comprises a second resistor R2 and a second field effect transistor Q2; one end of the second resistor R2 is electrically connected with the other end of the third resistor R3, the other end of the second resistor R2 is electrically connected with the drain electrode of the second field-effect tube Q2, the source electrode of the second field-effect tube Q2 is electrically connected with the other end of the eighth resistor R8, and the grid electrode of the second field-effect tube Q2 is electrically connected with the reverse pulse output end.
One end of the twenty-seventh resistor R27 is electrically connected with the workpiece, the other end of the twenty-seventh resistor R27 is electrically connected with one end of the twenty-eighth resistor R28, and the other end of the twenty-eighth resistor R28 is connected to the other pole of the direct-current voltage.
As shown in fig. 4, the current sampling circuit includes a first photoelectric coupler U44, an operational amplifier U46, a second photoelectric coupler U46, and an operational amplifier U47, an input end of the first photoelectric coupler U44 is electrically connected to one end of the seventh resistor R7, an output end of the first photoelectric coupler U44 is electrically connected to an input end of the operational amplifier U46, and an output end of the operational amplifier U46 is electrically connected to an I/O port of the single chip microcomputer. The first photocoupler U44 is used to isolate the voltage signal passing through the seventh resistor R7 from the output signal of the output terminal of the first photocoupler U44, so that they will not be interfered with each other. The operational amplifier U46 is used for amplifying the voltage signal output by the first photocoupler U44.
The input end of the second photoelectric coupler U45 is electrically connected with one end of the fourth resistor R4, the output end of the second photoelectric coupler U45 is electrically connected with the input end of the operational amplifier U47, and the output end of the operational amplifier U47 is electrically connected with an I/O port of the single chip microcomputer. The second photocoupler U45 is used to isolate the voltage signal at one end of the eighth resistor R8 from the output signal at the output end of the second photocoupler U45, so that they will not be interfered with each other. The operational amplifier U47 is used for amplifying the voltage signal output by the second photocoupler U47. The first photocoupler U44 and the second photocoupler U45 are both ACPL-C784-500E in type.
As shown in fig. 5, the power supply voltage sampling circuit includes a fifth photoelectric coupler U52 and an operational amplifier U53, an input terminal of the fifth photoelectric coupler U52 is electrically connected to the other end of the twenty-seventh resistor R27, an output terminal of the fifth photoelectric coupler U52 is electrically connected to an input terminal of the operational amplifier U53, and an output terminal of the operational amplifier U53 is electrically connected to an I/O port of the single chip microcomputer. The fifth photocoupler U52 is for the voltage signal of the other end of the twenty-seventh resistor R27 and the output signal of the output terminal of the fifth photocoupler U52 to prevent them from being interfered with each other. The operational amplifier U53 is used to amplify the voltage signal output by the fifth photocoupler U52.
As shown in fig. 6, the gap voltage sampling circuit includes a third photocoupler U48, an operational amplifier U50, a fourth photocoupler U49, and an operational amplifier U51, an input end of the third photocoupler U48 is electrically connected to one end of the fourth resistor R4, an output end of the third photocoupler U48 is electrically connected to an input end of the operational amplifier U50, and an output end of the operational amplifier U50 is electrically connected to an I/O port of the single chip microcomputer. The third photocoupler U48 is used for isolating the voltage signal at one end of the fourth resistor R4 from the output signal at the output end of the third photocoupler U48, so that they are not interfered with each other. The operational amplifier U50 is used for amplifying the voltage signal output by the third photocoupler U48.
The input end of a fourth photoelectric coupler U49 is electrically connected with one end of a fourth resistor R4, the output end of the fourth photoelectric coupler U49 is electrically connected with the input end of an operational amplifier U51, and the output end of the operational amplifier U51 is electrically connected with an I/O port of the single chip microcomputer. The fourth photocoupler U49 is used to isolate the voltage signal at one end of the third resistor R3 from the output signal at the output end of the fourth photocoupler U49, so that they will not be interfered with each other. The operational amplifier U51 is used for amplifying the voltage signal output by the fourth photocoupler U51. The third photocoupler U48 and the fourth photocoupler U49 are both ACPL-C784-500E in model number.
As shown in fig. 7, an input end of the voltage-frequency conversion circuit is electrically connected to an output end of the single chip microcomputer, and an output end of the voltage-frequency conversion circuit is electrically connected to a control system of the electric discharge machining apparatus; the single chip microcomputer is also used for transmitting a voltage signal to the voltage frequency conversion circuit; the voltage frequency conversion circuit is used for receiving a single chip microcomputer voltage signal sent by the single chip microcomputer, converting the single chip microcomputer voltage signal into a pulse feedback signal and sending the pulse feedback signal to a control system of the electric spark machining equipment.
The voltage frequency conversion circuit comprises a digital potentiometer U5, a first voltage frequency converter U4 and a second voltage frequency converter U6, wherein the input end of the digital potentiometer U5 is electrically connected with the output end of the single chip microcomputer, the output end of the digital potentiometer U5 is respectively and electrically connected with the input end of the first voltage frequency converter U4 and the input end of the second voltage frequency converter U6, and the output end of the first voltage frequency converter U4 and the output end of the second voltage frequency converter U6 are both electrically connected with a control system of the electric spark machining equipment;
the single chip microcomputer is also specifically used for outputting two paths of digital signals to the digital potentiometer U5; the digital potentiometer U5 is configured to receive the two paths of digital voltage signals, convert the two paths of digital voltage signals into two paths of analog voltage signals, and transmit the two paths of analog voltage signals to the first voltage frequency converter U4 and the second voltage frequency converter U6, respectively; the first voltage-frequency converter U4 is used for converting one path of the analog voltage signal into the pulse feedback signal and transmitting the pulse feedback signal to a control system of the electric spark machining equipment; the second voltage-frequency converter U6 is configured to convert the other path of analog voltage signal into the pulse feedback signal, and transmit the pulse feedback signal to a control system of the electrical discharge machining apparatus.
The embodiment of the utility model provides a control through the electrode utilization same pulse voltage of the two sides of waiting to process the work piece, the processing return circuit homogeneous phase on work piece two sides simultaneously, the electric spark synchronism that acts on the production of two surface electrodes like this is good, then the roughness's of work piece two sides uniformity is higher. By providing the reverse pulse control circuit, the pulse generator U11 that outputs the forward and reverse pulses can be used at the same time, and versatility is improved. Through setting up multichannel pulse input circuit, can selectively insert pulse voltage, under different kinds of pulse input, realize multiple mode switch. By arranging the voltage frequency conversion circuit, a voltage signal fed back by the single chip microcomputer can be directly identified by a numerical control encoder of a control system of the electric spark machining equipment, and the feedback efficiency of the equipment is improved.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the concept and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. A dual discharge circuit power supply for electrical discharge machining, comprising: the device comprises a pulse generator (U11), a first discharging loop and a second discharging loop which is the same as the first discharging loop; the pulse output end of the pulse generator (U11) is respectively connected with the controlled ends of the first discharging loop and the second discharging loop; connecting a workpiece to be electrosparking into one pole of direct current voltage; one end of the first discharging loop is connected to the other pole of the direct-current voltage, and one end of the second discharging loop is connected to the other pole of the direct-current voltage;
the other end of the first discharge loop is used for being connected with a first electrode of electric spark machining equipment, and the other end of the second discharge loop is used for being connected with a second electrode of the electric spark machining equipment;
the pulse generator (U11) is used for controlling the on-off of the first discharging loop and the second discharging loop by using the pulse voltage output by the pulse output end.
2. The dual discharge circuit power supply for electric discharge machining according to claim 1, wherein: the first discharge circuit comprises a fourth resistor (R4), a fifth resistor (R5), a tenth resistor (R10), a seventh resistor (R7), an eleventh resistor (R11), a third field-effect tube (Q3) and a nineteenth resistor (R19);
one end of the seventh resistor (R7) is used for being electrically connected with the first electrode; the other end of the seventh resistor (R7) is electrically connected to one end of the eleventh resistor (R11) and one end of the tenth resistor (R10), the other end of the tenth resistor (R10) is electrically connected to one end of the fourth resistor (R4), the other end of the fourth resistor (R4) is connected to one pole of the dc voltage, the other end of the eleventh resistor (R11) is electrically connected to the drain of the third field-effect transistor (Q3), the source of the third field-effect transistor (Q3) is connected to the other pole of the dc voltage, the gate of the third field-effect transistor (Q3) is electrically connected to one end of the nineteenth resistor (R19), and the other end of the nineteenth resistor (R19) is electrically connected to the pulse output end of the pulse generator (U11).
3. The dual discharge circuit power supply for electric discharge machining according to claim 2, characterized in that: the pulse output end of the pulse generator (U11) comprises a forward pulse output end and a reverse pulse output end, the forward pulse output end is used for outputting forward pulse voltage, the reverse pulse output end is used for outputting reverse pulse voltage, and the other end of the nineteenth resistor (R19) is electrically connected with the forward pulse output end; the first discharge loop further comprises a first resistor (R1) and a first field effect transistor (Q1); one end of the first resistor (R1) is electrically connected with the other end of the fourth resistor (R4), the other end of the first resistor (R1) is electrically connected with the drain electrode of the first field-effect tube (Q1), the source electrode of the first field-effect tube (Q1) is electrically connected with the other end of the seventh resistor (R7), and the grid electrode of the first field-effect tube (Q1) is electrically connected with the reverse pulse output end.
4. The dual discharge circuit power supply for electric discharge machining according to claim 3, characterized in that: the positive pulse output end comprises a first positive pulse output end, a second positive pulse output end and a third positive pulse output end; the other end of the nineteenth resistor (R19) is electrically connected with the first positive pulse output end; the first discharge circuit further comprises a twelfth resistor (R12), a fourth field effect transistor (Q4), a thirteenth resistor (R13), a fifth field effect transistor (Q5), a fourteenth resistor (R14) and a sixth field effect transistor (Q6); one end of the twelfth resistor (R12), one end of the thirteenth resistor (R13) and one end of the fourteenth resistor (R14) are electrically connected with the other end of the seventh resistor (R7); the drain electrode of the fourth field effect transistor (Q4) is electrically connected with the other end of the twelfth resistor (R12), the source electrode of the fourth field effect transistor (Q4) is connected to the other electrode of the direct-current voltage, and the grid electrode of the fourth field effect transistor (Q4) is electrically connected with the second forward pulse output end; the drain electrode of the fifth field effect transistor (Q5) is electrically connected with the other end of the thirteenth resistor (R13), the source electrode of the fifth field effect transistor (Q5) is connected to the other electrode of the direct-current voltage, and the grid electrode of the fifth field effect transistor (Q5) is electrically connected with the third forward pulse output end; the drain electrode of the sixth field effect transistor (Q6) is electrically connected with the other end of the fourteenth resistor (R14), the source electrode of the sixth field effect transistor (Q6) is connected to the other electrode of the direct-current voltage, and the grid electrode of the sixth field effect transistor (Q6) is electrically connected with the third forward pulse output end.
5. The dual discharge circuit power supply for electric discharge machining according to claim 1, characterized in that: the double-discharge loop power supply for the electric spark machining further comprises a gap voltage sampling circuit, a current sampling circuit, a power supply voltage sampling circuit and a voltage frequency conversion circuit; the pulse generator (U11) is a single chip microcomputer, the input end of the gap voltage sampling circuit is electrically connected with the first discharging circuit and the second discharging circuit, the input end of the current sampling circuit is electrically connected with the first discharging circuit and the second discharging circuit, the input end of the power supply voltage sampling circuit is connected to one pole of the direct current voltage, and the output end of the gap voltage sampling circuit, the output end of the current sampling circuit and the output end of the power supply voltage sampling circuit are electrically connected with the input end of the single chip microcomputer;
the input end of the voltage-frequency conversion circuit is electrically connected with the output end of the single chip microcomputer, and the output end of the voltage-frequency conversion circuit is electrically connected with a control system of the electric spark machining equipment.
6. The dual discharge circuit power supply for electric discharge machining according to claim 5, characterized in that: the voltage frequency conversion circuit comprises a digital potentiometer (U5), a first voltage frequency converter (U4) and a second voltage frequency converter (U6), wherein the input end of the digital potentiometer (U5) is electrically connected with the output end of the single chip microcomputer, the output end of the digital potentiometer (U5) is electrically connected with the input end of the first voltage frequency converter (U4) and the input end of the second voltage frequency converter (U6), and the output end of the first voltage frequency converter (U4) and the output end of the second voltage frequency converter (U6) are electrically connected with a control system of the electric spark machining equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223126118.8U CN218745353U (en) | 2022-11-24 | 2022-11-24 | Double-discharge loop power supply for electric spark machining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223126118.8U CN218745353U (en) | 2022-11-24 | 2022-11-24 | Double-discharge loop power supply for electric spark machining |
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| Publication Number | Publication Date |
|---|---|
| CN218745353U true CN218745353U (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223126118.8U Active CN218745353U (en) | 2022-11-24 | 2022-11-24 | Double-discharge loop power supply for electric spark machining |
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| CN (1) | CN218745353U (en) |
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