CN101259551B - Electrospark wire-electrode cutting process discharge condition detecting device - Google Patents
Electrospark wire-electrode cutting process discharge condition detecting device Download PDFInfo
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- CN101259551B CN101259551B CN2008100889250A CN200810088925A CN101259551B CN 101259551 B CN101259551 B CN 101259551B CN 2008100889250 A CN2008100889250 A CN 2008100889250A CN 200810088925 A CN200810088925 A CN 200810088925A CN 101259551 B CN101259551 B CN 101259551B
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Abstract
The invention discloses an electrical discharge wire cutting machining discharge state detection device, which comprises a current sensor, a voltage division circuit, a comparison circuit, a signal driving circuit and a floating voltage stabilizing power supply circuit; the detection device controls the three discharge states of no-load, spark and short-circuit during the processing process by the on-line real-time sampling of the duty ratio of the gap voltage waveform and the on-line real-time adjustment of the output voltage of an adjustable voltage stabilizing power supply; the floating on-line real-time detection is carried out by the respective lasting times of the no-load, the spark and the short-circuit in the single pulse width and the relative time utilization ratio, which can effectively solve the problem that the gap voltage is fluctuated along with the gap current and further improve the detection precision and the sensitivity of the discharge states of the no-load, the spark and the short-circuit.
Description
Technical field
The present invention relates to a kind of processing discharge condition detection apparatus that is applicable to NC wirecut EDM machine.
Background technology
Zero load in the numerical control electric spark line cutting processing, spark, three kinds of discharge conditions of short circuit and spark discharge pulse utilization rate are the signs of discharge condition quality between reflection electrical spark working tool-electrode in man-hour and the workpiece, also are the important indicators of cutting speed, processing throughput and cutting stability simultaneously.
Present numerically controlled wire cutting machine, general the average voltage to discharging gap detects, and decides the size of feed speed with it.Because the gap voltage of machining gap is to keep voltage (about 25V) and short-circuit voltage by open-circuit voltage (80V), spark (2～10V) three kinds of fast changing voltages that differ in size on average constitute, and it is not single explicit value.Comprise a lot of uncertain factors in this gap voltage, therefore can worsen processing effect.Good as clearance discharge condition, can accelerate feed speed; Clearance discharge condition is bad, must reduce feed speed, otherwise short circuit even fracture of wire can occur.
Summary of the invention
The purpose of this invention is to provide a kind of electrospark wire-electrode cutting process discharge condition detecting device, this checkout gear is by the dutycycle of online real-time sampling gap voltage waveform, the output voltage of online real-time adjustment adjustable stabilized voltage supply is controlled these the three kinds of discharge conditions of zero load, spark and short circuit in the process; By unloaded, spark and the short circuit duration in the individual pulse width and the relative time utilization rate online real-time detection of floating respectively, can solve the problem of gap voltage effectively, thereby can improve zero load, spark and short circuit dischange status detection precision and sensitivity with the gap current fluctuation.
A kind of electrospark wire-electrode cutting process discharge condition detecting device of the present invention includes bleeder circuit, comparison circuit, signal drive circuit, the voltage-stabilized power supply circuit that floats, and current sensor.
Current sensor is used for the gap current between detecting electrode silk and the workpiece, and output voltage Vout, the reference voltage V ref corresponding with the current measured value gives bleeder circuit;
Bleeder circuit is used for the gap voltage between detecting electrode silk and the workpiece, and after dividing potential drop filtering was handled, the partial pressure value Fz of bleeder circuit output gap voltage gave comparison circuit to gap voltage in bleeder circuit;
Comparison circuit carries out calculation process to voltage Vout, the reference voltage V ref corresponding with the current measured value that receives and produces the spark threshold value Vrf1 that floats, and obtains short circuit pulse width signal ts1 by the partial pressure value Fz of gap voltage and sampling pulse width signal tsp0, unsteady spark threshold value Vrf1 and short circuit threshold value Vrf2 are made comparisons, unloaded pulse width signal td1, spark pulse width signal te1 export to signal drive circuit;
Signal drive circuit is exported to unsteady voltage-stabilized power supply circuit to short circuit pulse width signal Ts, unloaded pulse width signal Td, the spark pulse width signal Te that short circuit pulse width signal ts1, unloaded pulse width signal td1, the spark pulse width signal te1 that receives generates after isolating after driving; And short circuit pulse width signal Ts, unloaded pulse width signal Td after isolating, spark pulse width signal Te generate discharge pulse width signal TE through the logic OR computing and export to unsteady voltage-stabilized power supply circuit;
Float short circuit pulse width signal Ts, unloaded pulse width signal Td, spark pulse width signal Te and the discharge pulse width signal TE of voltage-stabilized power supply circuit after after phase inverter, triode, amplifier to the isolation that receives, thereby the interchange 30V power supply that the outside is supplied with is carried out producing respectively after rectifying and wave-filtering, pressure regulation are handled three tunnel signals that are linked into ammeter, intuitively demonstrate numerical value by ammeter A1, ammeter A2, ammeter A3.
The advantage of electrospark wire-electrode cutting process discharge condition detecting device of the present invention exists: (1) is detected in real time to gap current, obtain changing the voltage threshold that floats through operational amplification circuit, this threshold value and gap voltage partial pressure value are compared online these three kinds of discharge conditions of zero load (open circuit), spark discharge and short circuit of differentiating in real time in the Wire-cut Electrical Discharge Machining process with gap current; (2) control of unloaded, spark and these three kinds of discharge conditions of short circuit has been adopted not the online real-time detection method of the unsteady voltage-stabilized power supply formula discharge condition relative time utilization rate that changes towards the change in duty cycle of voltage waveform with droped beat.
Description of drawings
Fig. 1 is the structured flowchart that the present invention processes discharge condition detection apparatus.
Fig. 2 A is a bleeder circuit schematic diagram of the present invention.
Fig. 2 B is the unsteady unloaded threshold values computing circuit schematic diagram of the present invention.
Fig. 3 is that signal of the present invention is isolated and the drive circuit schematic diagram.
Fig. 4 is the unsteady voltage-stabilized power supply circuit schematic diagram of the present invention.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is a kind of electrospark wire-electrode cutting process discharge condition detecting device, and this discharge condition detection apparatus includes bleeder circuit, comparison circuit, signal drive circuit, the voltage-stabilized power supply circuit that floats, and current sensor.Current sensor is used for the gap current between detecting electrode (wire electrode or copper pipe electrode) and the workpiece, and output voltage Vout, the reference voltage V ref corresponding with the current measured value gives bleeder circuit.
Bleeder circuit is used for the gap voltage between detecting electrode and the workpiece, and after dividing potential drop filtering was handled, the partial pressure value Fz of bleeder circuit output gap voltage gave comparison circuit to gap voltage in bleeder circuit.
Comparison circuit carries out calculation process to voltage Vout, the reference voltage V ref corresponding with the current measured value that receives and produces the spark threshold value Vrf1 that floats, and obtains short circuit pulse width signal ts1 by the partial pressure value Fz of gap voltage and sampling pulse width signal tsp0, unsteady spark threshold value Vrf1 and short circuit threshold value Vrf2 are made comparisons, unloaded pulse width signal td1, spark pulse width signal te1 export to signal drive circuit.
Signal drive circuit is exported to unsteady voltage-stabilized power supply circuit to short circuit pulse width signal Ts, unloaded pulse width signal Td, the spark pulse width signal Te that short circuit pulse width signal ts1, unloaded pulse width signal td1, the spark pulse width signal te1 that receives generates after isolating after driving; And short circuit pulse width signal Ts, unloaded pulse width signal Td after isolating, spark pulse width signal Te generate discharge pulse width signal TE through the logic OR computing and export to unsteady voltage-stabilized power supply circuit.
Float short circuit pulse width signal Ts, unloaded pulse width signal Td, spark pulse width signal Te and the discharge pulse width signal TE of voltage-stabilized power supply circuit after after phase inverter, triode, amplifier, thereby the interchange 30V power supply that the outside is supplied with is carried out producing respectively after rectifying and wave-filtering, pressure regulation are handled three tunnel signals that are linked into ammeter the isolation that receives.In the present invention, the output current when ammeter A1 can be used to show short circuit, the output current when ammeter A2 can be used to show spark discharge, the output current when ammeter A3 can be used to show zero load.
Discharge condition detection apparatus of the present invention is by online real-time sampling gap voltage and gap current, and according to the online voltage threshold that floats in real time of gap current and the method for the online real-time comparison of gap voltage, come online these three kinds of discharge conditions of open circuit, spark discharge and short circuit of differentiating in real time in the Wire-cut Electrical Discharge Machining process, and the detection of the gap processing electric current trailing type floating voltage threshold method under these three kinds of states.
By the dutycycle of online real-time sampling droped beat towards voltage waveform, the output voltage V c of online real-time adjustment adjustable stabilized voltage supply controls these three kinds of discharge conditions of open circuit, spark discharge and short circuit the duration summation in the individual pulse width and the ratio of pulse width respectively in the line cutting processing.And the online real-time detection mode of the unsteady voltage-stabilized power supply formula discharge condition relative time utilization rate that does not change towards the change in duty cycle of voltage waveform with droped beat.In the present invention, current sensor is chosen LTSR25-NP model sensor, comparator U14 chooses the LM339 chip, opto-coupler chip U17, U18 chooses the 6N137 chip, phase inverter U7 chooses the 74LS06 chip, phase inverter U2, U13 chooses the 74VHC14 chip, decoder U20 chooses the 74HC139 chip, amplifier chip U8 chooses the LM741 chip, amplifier chip U9, U10, U11, U12, U15 chooses the TL081 chip, NAND gate U3 chooses the 74LS00 chip, and adjustable stabilized voltage supply is chosen the LM317 chip, ammeter A1, ammeter A2 and ammeter A3 choose the microampere meter that range is 100 μ A.The connection of each hardware circuit is:
2 ends of opto-coupler chip U17 and+be connected to resistance R 53 between the 12V power supply, 3 ends are connected with 14 ends of comparator U14,5 end ground connection, 6 ends are connected with 5 ends of phase inverter U13, and 6 ends connect power supply after resistance R 54,6 ends of phase inverter U13 are connected with 13 ends of decoder U20, and the outside sampling of 7 terminations pulse width signal is connected to capacitor C 55 between 8 ends and 5 ends.
2 ends of opto-coupler chip U18 and+be connected to resistance R 62 between the 12V power supply, 3 ends are connected with 13 ends of comparator U14,5 end ground connection, 6 ends are connected with 9 ends of phase inverter U13, and 6 ends connect power supply after resistance R 61,8 ends of phase inverter U13 are connected with 14 ends of decoder U20, and the outside sampling of 7 terminations pulse width signal is connected to capacitor C 58 between 8 ends and 5 ends.
3 terminations of comparator U14+12V power supply, 12 terminations simulation ground, 8 ends are connected with 2 ends of resistance R 47 in the bleeder circuit after resistance R 56,10 ends insert in the bleeder circuit after resistance R 63,11 ends are connected with 2 ends of resistance R 64,1 end of resistance R 64 is connected with+12V power supply through potentiometer R60, and 1 end through resistance R 65 and simulation be connected.
The outside sampling of 1 termination of phase inverter U13 pulse width signal, 2 ends are connected to 15 ends of decoder U20.
Bleeder circuit: the anode of diode D1 is connected with workpiece, be connected to resistance R 28, resistance R 46 between the negative electrode of diode D1 and the wire electrode in turn, and 1 termination of resistance R 46 simulation ground, be connected to the negative electrode of diode D2 between 1 end of resistance R 28 and 2 ends of resistance R 46, the anode of diode D2 and+be connected to resistance R 45 between the 12V, the anode of diode D2 connects simulation ground after capacitor C 5, and the anode of diode D2 connects simulation ground after capacitor C 7, the anode of diode D2 is connected with 1 end of resistance R 47, and 1 end and 2 ends of resistance R 47 are parallel with inductance L 2.
Amplifier chip U12:7 termination+12V power supply, 4 terminations-12V power supply, be connected to resistance R 31 between the Vout end of 3 ends and current sensor, and be connected to resistance R 39 between 3 ends and the ground, be connected to resistance R 32 between the Vref end of 2 ends and current sensor, be serially connected with between 2 ends and 6 ends between 3 ends of resistance R 26,6 ends and amplifier chip U15 and be connected to potentiometer R40.
Amplifier chip U15:7 termination+12V power supply, 4 terminations-12V power supply, 3 ends are ground connection after resistance R 27, and 2 ends are connected with 6 ends, are connected to resistance R 37 between 3 ends of 6 ends and amplifier chip U10.
Amplifier chip U9:7 termination+12V power supply, 4 terminations-12V power supply, 3 ends and+be connected to potentiometer R41 between the 12V power supply, and be connected to resistance R 36,2 ends between 3 ends and the ground and connect with 6 ends, be connected to resistance R 38 between 3 ends of 6 ends and amplifier chip U10.
Amplifier chip U10:7 termination+12V power supply, 4 terminations-12V power supply are connected to resistance R 30 between 2 ends and the ground, and are serially connected with resistance R 29,6 ends between 2 ends and 6 ends and are connected with 3 ends of amplifier chip U11.
Amplifier chip U11:7 termination+12V power supply, 4 terminations-12V power supply, 2 ends are connected with 6 ends, and 6 ends are connected with 9 ends of comparator U14 after filter circuit, resistance R 58; Filter circuit is made up of capacitor C 56, capacitor C 57, resistance R 57,1 end of resistance R 57 ground connection after capacitor C 56,2 ends of resistance R 57 ground connection after capacitor C 57.
3 ends of phase inverter U2 are connected with 9 ends of decoder U20,11 ends are connected with 10 ends of decoder U20, and 13 ends are connected with 12 ends of decoder U20, and 4 ends of phase inverter U2,10 ends, 12 ends connect with 3 ends, 5 ends, 9 ends of phase inverter U7 respectively, 4 ends are connected with 1 end, 10 ends are connected with 5 ends, and 12 ends are connected with 9 ends, 1 end of 2 termination NAND gate U3,2 ends of 6 termination NAND gate U3,5 ends of 8 termination NAND gate U3,3 ends of not gate U3 are connected with 4 ends, and 6 ends are connected with 11 ends of phase inverter U7.
Be connected to resistance R 10 between 4 ends of phase inverter U7 and the floating power supply Vc, and 4 ends are connected with the base stage of triode Q2, the colelctor electrode of triode Q2 meets floating power supply Vc, be connected to resistance R 20 between the emitter stage of triode Q2 and the ground, and be connected to potentiometer R33, resistance R 42 in turn between the emitter stage of triode Q2 and the ammeter A1; Be connected to resistance R 11 between 6 ends and the floating power supply Vc, and 6 ends are connected with the base stage of triode Q3, the colelctor electrode of triode Q3 meets floating power supply Vc, be connected to resistance R 21 between the emitter stage of triode Q3 and the ground, and be connected to potentiometer R34, resistance R 43 in turn between the emitter stage of triode Q3 and the ammeter A2; Be connected to resistance R 12 between 8 ends and the floating power supply Vc, and 8 ends are connected with the base stage of triode Q4, the colelctor electrode of triode Q4 meets floating power supply Vc, be connected to resistance R 22 between the emitter stage of triode Q4 and the ground, and be connected to potentiometer R35, resistance R 44 in turn between the emitter stage of triode Q4 and the ammeter A3; 10 ends are connected with 1 end, and 10 ends and+be connected to resistance R 14 between the 5V power supply, be connected to resistance R 7 between 2 ends and the floating power supply Vc, and 2 ends are connected with the base stage of triode Q1, the colelctor electrode of triode Q1 meets floating power supply Vc, be connected to resistance R 23 between the emitter stage of triode Q1 and the ground, and 3 ends of the emitter stage of triode Q 1 and amplifier chip U8 are connected to resistance R 18, resistance R 19,2 ends of resistance R 18 and 1 end of resistance R 19 ground connection after capacitor C 4 in turn; Be connected to resistance R 25 between 3 ends of amplifier chip U8 and the ground, be in series with resistance R 9 between 2 ends and 6 ends, 2 ends are connected with 2 ends of resistance R 16,1 end of resistance R 16 and+be connected to potentiometer R15, resistance R 8 in turn between the 5V power supply, and be connected to resistance R 24 between 1 end of resistance R 16 and the ground, and be connected to diode D5 between resistance R 161 ends and the ground; Be connected to resistance R 17 between 6 ends of amplifier chip U8 and the base stage of triode Q5, be connected to diode D4 between the base stage of triode Q5 and the ground, the grounded emitter of triode Q5, the colelctor electrode of triode Q5 is connected on 1 end of adjustable stabilized voltage supply chip U6.
Adjustable stabilized voltage supply chip U6:1 end is in series with resistance R 13,1 ends through diode D3 ground connection with 2 ends, and 2 ends and 3 ends are in series with diode D1, and 3 ends are through capacitor C 8 ground connection, and 3 ends are connected to inductance L 1 through capacitor C 9 ground connection between 1 end of 3 ends and full bridge rectifier D2; Be connected to capacitor C 11 between 1 end (positive pole) of full bridge rectifier D2 and the ground, and be connected to capacitor C 11 between 1 end (positive pole) and the ground, 2 ends (negative pole) ground connection of full bridge rectifier D2, outside supply with ± the 30V AC power inserts among the full bridge rectifier D2.
The TE of signal drive circuit output represents to process pulse width signal, and this processing pulse width signal TE affacts in the mu balanced circuit that floats.It being opened and turn-offing by twice anti-phase driving triode Q1's of phase inverter U7, the different dutycycle of TE signal is regulated the output current of 1 end of adjustable stabilized voltage supply U6 through triode Q1 with by amplifying circuit and triode Q5 that amplifier chip U8 forms, thereby regulates the output voltage V c of 2 ends.Dutycycle is little, and Vc is bigger.Signal Td, Te, Ts represent open circuit, spark and short circuit respectively, drive triode Q2, Q3, Q4 respectively by phase inverter, what of their shared electric current pulse width signal TE shares are directly proportional with the average current that flows through ammeter A1, A2, A3, so the reading of ammeter A1, A2, A3 is these three kinds of discharge conditions of open circuit, spark discharge and short circuit the duration summation in the individual pulse width and the ratio of pulse width respectively in the to-and-fro wire-travelling type line cutting processing.Its purpose is under the different processing pulse duty cycles, identical open circuit rate or identical spark rate and short circuit ratio, and the ammeter reading that reflects respectively is identical.
The Vout signal of current sensor output is linear with the current signal that is detected, and when the detection electric current is zero, output Vout value is identical with reference voltage Vref, so the subtracter that amplifier chip U 12 constitutes in the floating voltage threshold operation circuit subtracts each other the two-way voltage signal of current sensor input, obtains and the corresponding voltage parameter of gap current; Export the measuring-signal of process proportional zoom then through the voltage follower of potentiometer R40 and adjusting of resistance R 27 dividing potential drops and amplifier chip U15 composition, and this signal is outputed to an end of the adder that constitutes by amplifier chip U10, the fixed voltage value that the voltage follower that the input of the other end of adder is made of potentiometer R41 and resistance R 36 and amplifier chip U9 is set, the result of addition is according to gap current and changes the corresponding unsteady voltage threshold that calculates, output in the dividing potential drop comparison circuit at the voltage follower that constitutes through amplifier chip U11, as voltage ratio threshold value.
Claims (3)
1. an electrospark wire-electrode cutting process discharge condition detecting device includes current sensor, it is characterized in that: also include bleeder circuit, comparison circuit, signal drive circuit, unsteady voltage-stabilized power supply circuit;
Current sensor is used for the gap current between detecting electrode silk and the workpiece, and output voltage Vout, the reference voltage V ref corresponding with the current measured value gives bleeder circuit;
Bleeder circuit is used for the gap voltage between detecting electrode silk and the workpiece, and after dividing potential drop filtering was handled, the partial pressure value Fz of bleeder circuit output gap voltage gave comparison circuit to gap voltage in bleeder circuit;
Comparison circuit carries out producing the spark threshold value Vrf1 that floats after the calculation process to voltage Vout, the reference voltage V ref corresponding with the current measured value that receives, and obtains short circuit pulse width signal ts1 by the partial pressure value Fz of gap voltage and sampling pulse width signal tsp0, unsteady spark threshold value Vrf1 and short circuit threshold value Vrf2 are made comparisons, unloaded pulse width signal td1, spark pulse width signal te1 export to signal drive circuit;
Signal drive circuit is exported to unsteady voltage-stabilized power supply circuit to short circuit pulse width signal Ts, unloaded pulse width signal Td, the spark pulse width signal Te that short circuit pulse width signal ts1, unloaded pulse width signal td1, the spark pulse width signal te1 that receives generates after isolating after driving; And short circuit pulse width signal Ts, unloaded pulse width signal Td after isolating, spark pulse width signal Te generate discharge pulse width signal TE through the logic OR computing and export to unsteady voltage-stabilized power supply circuit;
Float short circuit pulse width signal Ts, unloaded pulse width signal Td, spark pulse width signal Te and the discharge pulse width signal TE of voltage-stabilized power supply circuit after after phase inverter, triode, amplifier to the isolation that receives, handle and produce three tunnel signals that are linked into ammeter respectively thereby the interchange 30V power supply that the outside is supplied with is carried out rectifying and wave-filtering, pressure regulation, intuitively demonstrate numerical value by ammeter A1, ammeter A2, ammeter A3.
2. discharge condition detection apparatus according to claim 1, the chip that it is characterized in that each circuit is chosen for: comparator U14 chooses the LM339 chip, opto-coupler chip U17, U18 chooses the 6N137 chip, phase inverter U7 chooses the 74LS06 chip, phase inverter U2, U13 chooses the 74VHC14 chip, decoder U20 chooses the 74HC139 chip, amplifier chip U8 chooses the LM741 chip, amplifier chip U9, U10, U11, U12, U15 chooses the TL081 chip, NAND gate U3 chooses the 74LS00 chip, adjustable stabilized voltage supply is chosen the LM317 chip, ammeter A1, ammeter A2 and ammeter A3 choose the microampere meter that range is 100 μ A.
3. discharge condition detection apparatus according to claim 1, it is characterized in that: being connected to of each circuit, 2 ends of opto-coupler chip U17 and+be connected to resistance R 53 between the 12V power supply, 3 ends are connected with 14 ends of comparator U14,5 end ground connection, 6 ends are connected with 5 ends of phase inverter U13, and 6 ends connect power supply after resistance R 54; 6 ends of phase inverter U13 are connected with 13 ends of decoder U20; The outside sampling of 7 terminations of opto-coupler chip U17 pulse width signal is connected to capacitor C 55 between 8 ends of opto-coupler chip U17 and 5 ends;
2 ends of opto-coupler chip U18 and+be connected to resistance R 62,3 ends between the 12V power supply to be connected with 13 ends of comparator U14,5 end ground connection, 6 ends are connected with 9 ends of phase inverter U13, and 6 ends connect power supply after resistance R 61; 8 ends of phase inverter U13 are connected with 14 ends of decoder U20; The outside sampling of 7 terminations of opto-coupler chip U18 pulse width signal is connected to capacitor C 58 between 8 ends of opto-coupler chip U18 and 5 ends;
3 terminations of comparator U14+12V power supply, 12 terminations simulation ground, 8 ends are connected with 2 ends of resistance R 47 in the bleeder circuit after resistance R 56, and 10 ends insert after resistance R 63 in the bleeder circuit, and 11 ends are connected with 2 ends of resistance R 64; 1 end of resistance R 64 is connected with+12V power supply through potentiometer R60, and 1 end through resistance R 65 and simulation be connected;
The outside sampling of 1 termination of phase inverter U13 pulse width signal, 2 ends are connected to 15 ends of decoder U20;
Bleeder circuit: the anode of diode D1 is connected with workpiece, be connected to resistance R 28, resistance R 46 between the negative electrode of diode D1 and the wire electrode in turn, and 1 termination of resistance R 46 simulation ground, be connected to the negative electrode of diode D2 between 1 end of resistance R 28 and 2 ends of resistance R 46, the anode of diode D2 and+be connected to resistance R 45 between the 12V, the anode of diode D2 connects simulation ground after capacitor C 5, and the anode of diode D2 connects simulation ground after capacitor C 7, the anode of diode D2 is connected with 1 end of resistance R 47, and 1 end and 2 ends of resistance R 47 are parallel with inductance L 2;
Amplifier chip U12:7 termination+12V power supply, 4 terminations-12V power supply, be connected to resistance R 31 between the Vout end of 3 ends and current sensor, and be connected to resistance R 39 between 3 ends and the ground, be connected to resistance R 32 between the Vref end of 2 ends and current sensor, be serially connected with between 2 ends and 6 ends between 3 ends of resistance R 26,6 ends and amplifier chip U15 and be connected to potentiometer R40;
Amplifier chip U15:7 termination+12V power supply, 4 terminations-12V power supply, 3 ends are ground connection after resistance R 27, and 2 ends are connected with 6 ends, are connected to resistance R 37 between 3 ends of 6 ends and amplifier chip U10.
Amplifier chip U9:7 termination+12V power supply, 4 terminations-12V power supply, 3 ends and+be connected to potentiometer R41 between the 12V power supply, and be connected to resistance R 36,2 ends between 3 ends and the ground and connect with 6 ends, be connected to resistance R 38 between 3 ends of 6 ends and amplifier chip U10;
Amplifier chip U10:7 termination+12V power supply, 4 terminations-12V power supply are connected to resistance R 30 between 2 ends and the ground, and are serially connected with resistance R 29,6 ends between 2 ends and 6 ends and are connected with 3 ends of amplifier chip U11.
Amplifier chip U11:7 termination+12V power supply, 4 terminations-12V power supply, 2 ends are connected with 6 ends, and 6 ends are connected with 9 ends of comparator U14 after filter circuit, resistance R 58; Filter circuit is made up of capacitor C 56, capacitor C 57, resistance R 57, and 1 end of resistance R 57 connects simulation ground after capacitor C 56, and 2 ends of resistance R 57 connect simulation ground after capacitor C 57;
3 ends of phase inverter U2 are connected with 9 ends of decoder U20,11 ends are connected with 10 ends of decoder U20,13 ends are connected with 12 ends of decoder U20,4 ends of phase inverter U2,10 ends, 12 ends connect with 3 ends, 5 ends, 9 ends of phase inverter U7 respectively, and 4 ends are connected with 1 end, and 10 ends are connected with 5 ends, 12 ends are connected with 9 ends, 1 end of 2 termination NAND gate U3,2 ends of 6 termination NAND gate U3,5 ends of 8 termination NAND gate U3; 3 ends of NAND gate U3 are connected with 4 ends, and 6 ends are connected with 11 ends of phase inverter U7;
Be connected to resistance R 10 between 4 ends of phase inverter U7 and the unsteady voltage-stabilized power supply circuit, and 4 ends are connected with the base stage of triode Q2; The colelctor electrode of triode Q2 connects unsteady voltage-stabilized power supply circuit, is connected to resistance R 20 between the emitter stage of triode Q2 and the ground, and is connected to potentiometer R33, resistance R 42 in turn between the emitter stage of triode Q2 and the ammeter A1; Be connected to resistance R 11 between 6 ends of phase inverter U7 and the unsteady voltage-stabilized power supply circuit, and 6 ends are connected with the base stage of triode Q3; The colelctor electrode of triode Q3 connects unsteady voltage-stabilized power supply circuit, is connected to resistance R 21 between the emitter stage of triode Q3 and the ground, and is connected to potentiometer R34, resistance R 43 in turn between the emitter stage of triode Q3 and the ammeter A2; Be connected to resistance R 12 between 8 ends of phase inverter U7 and the unsteady voltage-stabilized power supply circuit, and 8 ends are connected with the base stage of triode Q4; The colelctor electrode of triode Q4 connects unsteady voltage-stabilized power supply circuit, is connected to resistance R 22 between the emitter stage of triode Q4 and the ground, and is connected to potentiometer R35, resistance R 44 in turn between the emitter stage of triode Q4 and the ammeter A3; 10 ends of phase inverter U7 are connected with 1 end, and 10 ends and+be connected between resistance R 14,2 ends and the unsteady voltage-stabilized power supply circuit between the 5V power supply and be connected to resistance R 7, and 2 ends are connected with the base stage of triode Q1; The colelctor electrode of triode Q1 connects unsteady voltage-stabilized power supply circuit, be connected to resistance R 23 between the emitter stage of triode Q1 and the ground, and 3 ends of the emitter stage of triode Q1 and amplifier chip U8 are connected to resistance R 18, resistance R 19 in turn, 2 ends of resistance R 18 and 1 end of resistance R 19 ground connection after capacitor C 4; Be connected to resistance R 25 between 3 ends of amplifier chip U8 and the ground, be in series with resistance R 9 between 2 ends and 6 ends, 2 ends are connected with 2 ends of resistance R 16,1 end of resistance R 16 and+be connected to potentiometer R15, resistance R 8 in turn between the 5V power supply, and be connected to resistance R 24 between 1 end of resistance R 16 and the ground, and be connected to diode D5 between 1 end of resistance R 16 and the ground; Be connected to resistance R 17 between 6 ends of amplifier chip U8 and the base stage of triode Q5, be connected to diode D4 between the base stage of triode Q5 and the ground, the grounded emitter of triode Q5, the colelctor electrode of triode Q5 is connected on 1 end of adjustable stabilized voltage supply chip U6;
Adjustable stabilized voltage supply chip U6:1 end is in series with resistance R 13,1 ends through diode D3 ground connection with 2 ends, and 2 ends and 3 ends are in series with diode D1, and 3 ends are through capacitor C 8 ground connection, and 3 ends are connected to inductance L 1 through capacitor C 9 ground connection between 1 end of 3 ends and full bridge rectifier D2; Be connected to capacitor C 11 between 1 end of full bridge rectifier D2 and the ground, and be connected to capacitor C 11 between 1 end and the ground, the 2 end ground connection of full bridge rectifier D2, outside supply with ± the 30V AC power inserts among the full bridge rectifier D2.
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|---|---|---|---|---|
| CN101823172B (en) * | 2010-03-08 | 2014-02-05 | 苏州新火花机床有限公司 | Medium-speed wire digital servo pulse parameter configuration module |
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| CN110142471B (en) * | 2019-07-02 | 2021-05-18 | 哈尔滨工业大学 | Device and method for detecting abnormal discharge state of insulating ceramic coating-metal electric spark machining |
| CN110988633B (en) * | 2019-12-20 | 2021-10-26 | 中南大学 | Multifunctional monitoring method for self-adaptive adjustment of wire cut electrical discharge machining process |
| CN112404614B (en) * | 2020-10-26 | 2021-09-28 | 中国工程物理研究院机械制造工艺研究所 | Device and method for detecting discharge state of very high frequency electric spark machining |
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