JPH0335933A - Discharge state analyzing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a discharge state analysis device for analyzing a discharge state in electrical discharge machining.

(Prior art) For example, electric discharge machining includes wire electric discharge machining and die-sinker electric discharge machining, among which, for example, wire electric discharge machining is a process in which wire electrodes are arranged at a predetermined interval with respect to the workpiece. The workpiece and the wire electrode are then penetrated into a processing bath, and in this state, a DC voltage is applied between the workpiece and the wire electrode. For example, when the wire electrode is brought close to the workpiece and the gap amount reaches a predetermined amount, the wire 71! Pulse discharge occurs between ti and the workpiece. However, the workpiece is machined by the energy generated by this pulsed discharge.

In this type of wire electrical discharge machining, the quality of the machining condition is judged, and this judgment is made based on whether the electrical discharge condition is normal or abnormal, and this judgment is made by the following method. . That is, (1) the worker visually observes the discharge column and determines the discharge state based on experience and intuition from the brightness of the discharge column;

■Workers listen to the sound of discharge and judge the state of discharge based on their experience and performance.

■If the wire electrical discharge machining apparatus is equipped with an oscilloscope, display the waveform of the discharge voltage and group 76 current between the wire electrode and the workpiece on this oscilloscope, for example,
The discharge state is determined from these discharge voltage and discharge current.

(2) If a standard for determining whether the discharge state is good or bad is set in advance in the wire electric discharge machining device, the discharge state is determined according to this standard.

However, among the above-mentioned methods, methods (1) and (2) do not quantitatively determine the discharge state, and the results of the determination vary. In addition, in method (2), the frequency band of the oscilloscope is slower than the discharge, and the discharge voltage and discharge current cannot be displayed in real time. Furthermore, since the occurrence of discharge is random and the discharge voltage and discharge current are not maintained,
The waveforms of the discharge voltage and discharge current displayed on an oscilloscope are difficult to understand, and it is difficult to make quantitative judgments from the waveforms. In method (2), the pass/fail standard is set by each manufacturer, for example, and the t of all discharge states is
! It cannot be applied to I-cuts.

Furthermore, in the method (■), each manufacturer takes measures to avoid abnormalities and prevents various wire breaks, but because of this, it is not possible to achieve the highest efficiency of machining, and the efficiency is always maintained at, for example, 60 to 70%. This results in a lack of accuracy in detecting the machining status. Therefore, even if an abnormal discharge is detected, the (r', '1lfj characteristics) of detecting this abnormal discharge will be low.However, the discharge state must be monitored and the conditions for discharge possible, such as the moving speed of the wire electrode, etc. 11 Even if feedback is given to the flow rate of the working fluid, etc., it is difficult to appropriately control electrical discharge machining.

(Problems to be Solved by the Invention) As described above, the reliability of abnormal discharge detection was low, and the discharge state could not be accurately grasped.

Therefore, an object of the present invention is to provide a discharge state analysis device that can quantitatively grasp the discharge state.

[Structure of the Invention] (Means for Solving the Problem) The present invention includes a detector that detects a discharge voltage and a discharge current to a workpiece and a discharge electrode, and a detection signal from this detector. A signal collecting means that digitally converts and captures at a predetermined sampling period every signal collecting period at regular intervals, and a discharge that creates discharge data consisting of discharge voltage etc. in each discharge from each detection signal collected by this signal collecting means. a data creation means; a discharge classification means for classifying discharge into normal discharge, abnormal discharge, etc. based on values such as discharge voltage created by the discharge data creation means; a result of classification by the discharge classification means and the creation of the discharge data; This is an electrical discharge state analysis device that attempts to achieve the above object, and includes electrical discharge analysis means that calculates the efficiency of electrical discharge machining from electrical discharge data created by the device.

(Function) With the provision of such a means, when the discharge voltage and discharge current to the workpiece and the discharge electrode are detected, this detection signal is collected by the signal acquisition means at regular interval signal acquisition periods. Irk ? which is digitally converted and taken in at a predetermined sampling period, h'i>h data creation means I, which consists of discharge voltage, etc. Created as TS data. Then, the discharge classification means classifies the discharge into normal discharge, abnormal discharge, etc. based on the values of the discharge voltage, etc. of this discharge data, and furthermore, the discharge is classified into normal discharge, abnormal discharge, etc. based on the classified results and the electric data. is calculated.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall IR diagram of a discharge state analysis device applied to wire machining discharge. The workpiece 2 is permeated into the inside of the processing tank. Wire electrodes 3 are arranged on this workpiece 2 at predetermined intervals. Note that this wire electrode 3 is supported by an upper wire guide body 4 and a lower wire guide body (not shown). A DC power source 6 is connected between the workpiece 2 and the wire electrode 3 via a discharge control circuit 5 to form a discharge circuit. In this case, the positive electrode of the DC power source 6 is connected to the workpiece 2.

In this discharge circuit, a voltage detector 7 is connected in parallel to the DC power source 6, and a current detector 8 is connected to the DC 7rS source 6.
are connected in series.

On the other hand, 10 is an analysis device main body, and this analysis device main body 10 is equipped with attenuators (ATT) 11, 12, a voltage detector 7 is connected to one attenuator 11, and a current is connected to the other attenuator 2. A detector 8 is connected. These a sotenators 11. , 12 each have a built-in memory for A/D (analog/digital) conversion:! :413.14 are connected and these A
The /D converter 1.3.14 is connected to a CPU (central processing unit) 16 via a bus 15. This CPU 16 is connected to a timing controller 17 and an RA via a bus 15.
M (random access memory) 18, ROM (
A read-only memory), a display drive section 20, a printer drive section 21, and a human operation section 22 such as a keyboard are connected. Timing controller 17 is A/D
It controls the signal acquisition timing in the converters 13 and 14. Further, a display device 23 such as a CRT display is connected to the display drive section 20, and a printer 24 is connected to the printer drive section 21.

The ROM 19 contains A/A in the timing controller 17.
A signal acquisition timing program for the D converters 13, 14 is stored. However, according to this signal acquisition timing program, each A/D converter 13, 14 digitally converts the voltage detection signal and current detection signal into 8 bits at the same time, for example, every x'ns during the signal acquisition period at fixed intervals ΔH. For example, 1024~ in one signal acquisition period
65538B data will be collected. However, each A/D converter 13, 14, CPU 16, timing controller 17, and ROM 19 constitute a signal acquisition means.

Further, the ROMI 9 stores a discharge data creation program, a discharge classification program, a discharge analysis program, and a history creation program. However, by executing these programs, the CPU 16, as shown in FIG. It has 5 functions. Note that the signal acquisition means 16-1 has a part of the function of the signal acquisition means as described above.

The discharge data creation means 16-2 calculates the discharge voltage and discharge voltage in each discharge from the digital voltage detection signal and digital current detection signal collected by the signal collection means. [It has a function to create discharge data consisting of parameters such as flow.

Further, the discharge classification means 16-3 has a function of classifying discharge into three types, abnormal discharge, transient discharge, and normal discharge, based on the discharge voltage value of the discharge data. Here, the abnormal discharge is an arc discharge pulse and a short circuit, and the transient discharge occurs when a considerable amount of machining debris is present between the workpiece 2 and the wire electrode 3. A normal discharge occurs when there are no machining debris between the workpiece 2 and the wire electrode 3.

The discharge analysis means 16-4 calculates the efficiency and stability of electrical discharge machining from the abnormal discharge, transient discharge, and normal discharge classified by the discharge classification means 16-3 and the discharge data created by the discharge data creation means 16-2. In addition to calculating surface roughness, it also has a discharge gap image function that graphically displays the state of discharge energy between the workpiece 2 and the wire electrode 3, as well as functions such as wire breakage prediction judgment and machining condition instructions. It is something that you have. Specifically, a histogram creation means 16-6 and an analysis calculation means 16-7 are provided. The histogram creation means 16-6 has a function of creating histograms of the discharge voltage, discharge current, discharge energy, etc. of each discharge in the discharge data, and obtains the I&frequency value from the histogram of the discharge energy, for example, and performs analytical calculation. The means 16-7 has a function of calculating the efficiency, stability, surface roughness, etc. of electrical discharge machining from the mode value obtained from the above-mentioned electrical discharge data and each histogram.

The history creation means 16-5 has a function of receiving the efficiency, stability, etc. calculated by the discharge M analysis means 16-4, and creating and printing out history data.

Furthermore, as shown in FIG. 3, the RAM 18 stores adjustment data for various parameters such as discharge pulse width for improving machining conditions such as speed in discharge machining. Here, parameter 1 is pulse width La, pulse interval L
b, discharge voltage ALd, discharge voltage Le, abnormality detection level Lf
are set, and the conditions are also set to improve speed, improve roughness, and furthermore improve sensitivity. And 1. S
! J! For example, if the speed is to be improved, the Xi data will widen the pulse width La, narrow the pulse interval Lb, further increase the discharge current Ld, raise the discharge voltage Le, and lower the abnormality detection level Lf. .

Then, when the machining conditions are manually entered from the input operation section 22, the CPU 16 reads each parameter of the machining conditions and adjustment data from the RAM 18, and uploads the adjustment data.
J and down "↓", for example, "pulse width Lar wide" have a function of displaying up "↑" on the display device 23. In addition to the above-mentioned functions, the CPU 16 also performs functions such as -H to distinguish between rough cutting and finishing, and an All arrangement change function.
are doing.

Next, let us discuss the operation of the device constructed as described above.
'l and explain.

] A DC voltage is applied between the two objects 2 and the wire electrode 3 from the one-merging power source 6 through the discharge control circuit 5, and in this state, when the gap between the workpiece 2 and the wire electrode 3 reaches a predetermined amount. , a pulse discharge occurs between the workpiece 2 and the wire electrode 3, and the energy of this pulse discharge causes the workpiece 2 to
is processed.

In this state, the voltage detector 7 is connected to the electrode 2 and the wire electrode 3.
The current detector 8 detects the pulsed electric current flowing from the pressurized part 1 to the wire electrode 3 and outputs the voltage detection signal. 7
Output. These voltage detection signals and current detection signals are each attenuated by an attenuator 11.12 to a level that is easy to process, and then input to an A/D converter 1.3.14. At this time, each A/D converter 13, 1.4 is controlled by the timing controller 17 to digitally convert and input the voltage detection signal and current detection signal, respectively.

In other words, as shown in FIG. 4, each A/D converter 13, 14 operates during each signal sampling period H, H2...
. The voltage detection signal and current detection signal are each digitally converted into 8 bits and taken in at the same time, for example, every xns. As a result, in one signal acquisition period, for example, signal acquisition period H3, for example, 1024 to 65536
Data of B is imported.

In this way, the digital voltage detection signal and digital current signal captured in one signal sampling period are transmitted to each A/D.
The signal is temporarily stored in a memory within the converter 13, 14, and transferred and stored in the RAM 18 by the CPU 16 after each signal acquisition period H, H2, . . . .

In this way, the digital voltage detection signal and the digital current signal are captured and stored in the RAM 18, and when the signal sampling period ends, for example, 10 times, the discharge data creation means 16-2 of the CPL 116 outputs each digital voltage detection signal and digital current signal. The respective waveforms of the discharge voltage and discharge current as shown in FIG. 5 are determined from the signals, and occurrence numbers rlJ r2J . . . rNJ are assigned from these waveforms in the order of discharge occurrence. From these waveforms, the CPU 16 determines the IJ3L voltage 1 for each discharge: start al, a2=-an, discharge end bl, l+2-bn, Ir'i.

Tail voltage cl, c2・-cnS'711nS-k(ll
! di, d2・=dn, current pulse width el, e2
...en, discharge energy rI.

2. Obtain discharge data D consisting of parameters such as ro1 pulse interval gl, g2 . . . go, and store this discharge data D in the form of a table in RAM 18.

When the discharge data D is obtained in this way, the CPU 16 determines the machining state. In this case, the CPU 16 uses the RAM 18
A current peak value dl is read from the digital current detection signal stored in the digital current detection signal, and this current peak value dl is compared with a preset threshold value. Based on this comparison, if the current peak value di is larger than the threshold, the CPU 6 determines that the current electrical discharge machining is rough machining, and if the current peak value di is smaller than the threshold, CPU
No. 16 determines that electrical discharge machining is finishing machining.

Next, the CPU 16 sets the measurement range. That is, C
The PU 16 determines current peaks and voltage peaks from each digital voltage detection signal and digital current signal stored in the RAM 18. Next, the CPU 16 determines whether the current peak value is at least a predetermined percentage, for example 40%, of the current range of the measurement range, for example 0-1000A. Here, if the current peak value is 150 A as shown in Fig. 6, this current peak value is 40
% or less, the CPU 16 lowers the measurement range by one range and changes the current range from 0 to 400A as shown in Figure 7.
The CPU 16 again determines that the current peak value is 4 for the current range O to 400 A of the measurement range.
Determine whether it is 0% or more. In this case as well, the current peak value is 40% or less for the current range 0 to 400 A, so the CPU 16 further lowers the measurement range by one range and changes it to the fi current range 0 to 200 A measurement range as shown in Figure 8. do. Thus, the current peak value is within the current range O
This is 40% or more compared to ~20OA, and the measurement range of the current range is set to 0~20OA. Next, the CPU 16 sets the 1P1 constant relay range for the voltage in the same way as it sets the measurement range for the current range.

Next, the CPU 16 determines whether the electric discharge machining state determined above is rough machining or finishing machining, and if it is rough machining, the sampling period of each A/D converter 13, 14 is set to 9th.
As shown in the figure, it is set to xns, and for finishing processing, the sampling period of each A/D converter 13 and 14 is set to yns as shown in the figure.

After this, if the electrical discharge machining state is rough machining, the CPU 16
In each signal acquisition period H,, H2..., the current detection signal is output every
At the same time, the voltage detection signal is captured in the changed measurement range. Then, when the signal sampling period H1H2, .

Next, the discharge classification means 16-3 compares the preset discharge limit voltage with each of the discharge voltages cl, C2, .
2 is detected as an arc discharge pulse which is an abnormal discharge and a short circuit. When an abnormal discharge is detected in this way, the respective data of the discharge start C2, discharge end b2, discharge voltage C2, and current peak value d2 of the occurrence number "2" of this abnormal discharge C2 are deleted from the table. In this case, the occurrence number "2"
" is transferred to the abnormal discharge table formed in the RAM 18.

Next, the discharge classification means 16-3 divides the discharge voltages cl, C3, C4...cn from the discharge data D in which abnormal discharges have been erased.
−1 and cn are extracted to create a histogram of discharge voltage shown in FIG. 1O. The histogram created in this way has two histogram groups Q1. Q2 appears. Here, the histogram group Ql is the workpiece 2 and the wire electrode 3.
The area between the workpiece 2 and This is due to variations in the discharge resistance value due to slight residual machining debris between the wire electrode 3 and changes in the gap amount between the workpiece 2 and the wire electrode 3 due to vibrations of the wire electrode 3 and the like. On the other hand, histogram group Q2 shows a transient state in which a considerable amount of machining debris remains between the workpiece 2 and the wire electrode 3, and this machining debris reduces the resistance value between the gaps, causing discharge even when the discharge voltage is low. This shows a typical discharge. However, the discharge classification means 16-3 classifies histogram group Q1 as normal discharge and classifies histogram group Q2 as transient discharge.

Next, the histogram creation means 16-6 creates histograms of each discharge voltage, discharge current, discharge energy, etc. in the discharge data D, and calculates the mode from the histogram of discharge energy, for example.

Then, the solution W-'3 output means 16-7 calculates efficiency, stability, etc. First, to explain the efficiency calculation function, 6-7 is the current pulse width e of normal discharge.
l, e3. Sum of e4...en=1゛Calculate period Et, and ajt period H+ of signal sampling opening/opening 10 times
+H2+...+H1j are determined, and the ratio of these total periods, that is, the duty it Q of the discharge current waveform is calculated as 4''.

Q = E t / (H'l + H2+...
+H32)... (1) When the efficiency Q is calculated in this way, the analysis calculation means 16-7 displays the efficiency Q in the display drive section 20.
The image is sent to the display device 23 to make it smaller. Figure 11 shows efficiency Q
is displayed as a bar.

Further, the A'ti fold calculation means 16-7 calculates the number N of occurrences of abnormal discharge.
a and the number N [of transient discharges that occur] are determined, and the ratio of these numbers of occurrences to the total discharge concentration N is calculated as the stability Se. That is, Se - (Na+Nt)/N = 12).

By the way, this stability Se also indicates whether the workpiece 2 and the electrode 3 are too close to each other. In other words, for example, when there is no machining waste, the wave phase 1' and the workpiece 2 are too close to each other. The wire electrode 3 is too close to each other. This is because the resistance value between the workpiece 2 and the wire electrode 3 becomes small, causing the above-mentioned abnormal discharge and transient discharge. The calculation means 16-7 sends the stable sentence Se to the table 711 drive unit 20 and displays the bar = - on the display device 2'4. It is divided into three degrees: rate, good, and 6 low 5i' (dangerous).

Next, the carp analysis calculation f-stage 16-7 calculates the number of normal discharge occurrences Ns and the mode h obtained by the one-stogram creation means 16-6.
The surface roughness Rm of the workpiece 20 is calculated from the alternating current energy E and displayed on the display device 23.

Further, the analysis calculation means 16-7 displays the discharge gap image on the display device 23. That is, the analysis calculation means 16-
7 is the ratio of the total interval El of the current pulse width of normal discharge in the above 10 signal sampling periods H, H, ... and the sum of the signal sampling periods Hll, H2, ... = 1 period H8, that is, normal Discharge pulse generation interval QT QT −Ho / E t
-(3), and then calculate the gap ff1FF-a-W.f(E)/Q.-<4).Here, a is the number of dots on the display device 22, W
is the full scale of the display 21 in the horizontal axis direction.

Further, the analysis calculation means 16-7 determines a machining energy range De corresponding to the state of discharge of machining waste between the wire electrode 3 and the workpiece 3. That is, the machining energy range De is calculated from De-Ff(Xs)-(5). Here, Xs is the ratio of the number of abnormal discharges to the total number of discharges. However, as shown in FIG. 12, the range designation frame K indicating the machining energy range moves in the horizontal direction on the drawing in accordance with the magnitude of the machining energy. Note that this machining energy range De expresses machining stability as a machining energy range, since the balance between machining energy and the gap affects the discharge status of machining waste. The larger the amount of processing waste, the narrower De becomes, and the smaller the amount, the wider De becomes.

Or does the analysis calculation means 16-7 predict wire breakage? 11 constant 1-1 5. That is, the analysis calculation means 167 calculates the discharge energy rl, r2. from the discharge data D. r3rn is extracted 17 and sequentially compared with the discharge energy threshold. As a result of this comparison, for example, if the discharge energy f3 is larger than the discharge energy threshold value, it is determined that there is a high risk of disconnection of the wire electrode 3 (i11), and this fact is displayed on the display device 22. FIG. 13 is an example of a display indicating the danger of wire breakage, in which "Danger of wire breakage!!" is displayed.

Further, the analytical calculation means 16-7 compares the stability S e' with the approach degree threshold. As a result of this comparison, the stability S
If e is larger than the approach degree threshold, the analysis calculation means 16-7 determines that there is a high risk of disconnection of the wire electrode 3, and displays this on the display device 23 as shown in FIG. . In this case, the display device 23 will display “Wire disconnection”.
danger! ! ” and “Wire Proximity” are displayed.

Furthermore, the analysis calculation means 16-7 calculates the ratio of the abnormal discharge occurrence time obtained previously to the total data length as contact ratio AA - abnormal discharge occurrence time/total data length (6), Compare the contact rate A and the contact rate threshold rate. This contact rate A represents the degree of contact of the wire electrode 3 with the workpiece 2. This contact rate A is compared with the contact rate threshold rate, and if the contact rate A is larger than the contact rate threshold rate, then the contact rate A is larger than the contact rate threshold rate. It is determined that there is a high risk of wire breakage occurring in the wire electrode 3, and this fact is displayed on the display device 22 as shown in FIG.

Next, the operation of the history creation means 16-5 will be explained. This history creation means 16-5 is configured to sequentially obtain the efficiency Q,
The stability Se and the contact rate A are stored in the RAM 18 as historical data, and the efficiency Q, the stability Se and the contact rate A are printed out by the printer 24 as shown in FIG. Figure 14 is an example of a printout,
The efficiency Q and the stability Se are shown as historical data by the lengths of bars in the horizontal direction, and the contact rate A is shown numerically as historical data. In addition, along with the contact rate A, rE
The letter J has been added because it has been determined that there is a high risk of disconnection of the wire electrode 3. Further, data such as the number of discharge occurrences, discharge energy, and group 711E are also printed out.

By the way, if machining conditions deteriorate during electrical discharge machining, electrical discharge will not occur between the workpiece 2 and the wire electrode 3, and electrical discharge machining will not be performed. In such a case, the discharge voltage does not appear, and the CPU 16 starts the internal timer operation from this time. Then, when the discharge mW pressure appears again, the CPU 16
stops the operation of the internal timer, calculates the non-discharge period G from the count value, and sends it to the printer drive section 21. As a result, the non-discharge period G is printed out as a no-signal time, for example, 80 seconds. Note that the internal timer operates even when the discharge voltage does not appear due to replacement of the workpiece 2, and counts the time, and the period required for the replacement at this time is printed out.

On the other hand, when the human power operation section 22 receives a manual instruction for machining conditions for speed improvement, the CPU 16 reads each adjustment data shown in FIG. 3 from the RAM 18 and uploads these adjustment data "↑
” and down “↓”, and these converted adjustment data and each parameter are sent to the display driving unit 20 in correspondence with each other. In this way, the display device 23 displays various adjustment data for speed improvement as shown in FIG.
↓” is displayed. Note that although speed improvement and roughness improvement are displayed in the figure, only one of them is actually displayed.

In this way, in the above embodiment, the discharge N voltage and discharge? 1! The current is detected and captured at a predetermined sampling period for each signal collection period to create discharge data D, the discharge is classified based on values such as the discharge voltage of this discharge data, and then from this classified result and the discharge data D. Since the efficiency of electrical discharge machining can be calculated, the state of electrical discharge machining can be determined quantitatively by efficiency Q1 stability, surface roughness, etc., and the image of the electrical discharge gap can be displayed graphically, making it possible to visually check the machining state. can be grasped. Furthermore, the risk of disconnection of the wire electrode 3 can be predicted AI3, and the machining conditions can be adjusted to the best possible conditions by displaying machining condition instructions.

Furthermore, since history data is printed out, unprocessed parts can be easily identified even during unmanned electrical discharge machining.

Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without departing from the spirit thereof. For example, in the embodiment described above, abnormal discharges are classified based on discharge voltage, but they may be classified based on discharge peak values.

Furthermore, the display of efficiency and the like is not limited to bar display. Furthermore, this i-device is not limited to wire electrical discharge machining equipment, but also applies to die-sinker electrical discharge machining, electrolytic machining, welding machines, laser application equipment, lighting equipment, sputtering equipment, etc. by changing the sampling range of voltage and current signals. PVD and C
It can also be applied to electrical discharge application equipment such as VD plasma processing equipment. Among these, in the sputtering apparatus, the flow m of the discharge medium can be adjusted by detecting the sheet weight state.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a discharge state analysis device that can quantitatively grasp the discharge state.

[Brief explanation of drawings]

1 to 15 are diagrams for explaining one embodiment of the discharge state analysis device according to the present invention, and FIG. 1 shows the structure b5. Fig. 2 is a functional block diagram, Fig. 3 is a schematic diagram of cutting condition data, Fig. 4 is a schematic diagram showing the signal acquisition period, Fig. 5 is a waveform diagram of discharge voltage and discharge current, and Fig. 6 is a schematic diagram of data of cutting conditions. Figures 9 to 8 are diagrams for explaining the measurement range switching action, and Figure 9 is a diagram for explaining the measurement range switching action.
10 is a diagram showing the sampling period, FIG. 10 is a diagram for explaining the effect of discharge classification, FIG. 11 is a diagram showing an example of displaying the machining state, FIG. 12 is a diagram showing an example of displaying the discharge gap image, FIG. 13 is a diagram showing a display example of the wire breakage element Sj, FIG. 14 is a diagram showing a printout example of history data,
FIG. 15 is a diagram showing a display example of machining condition instructions. DESCRIPTION OF SYMBOLS 1... Processing tank, 2... Workpiece, 3... Wire electrode, 4... Upper wire guide body, 5... Discharge control circuit, 6... DC power supply, 7... Voltage detector, 8...
Current detector, 10... Analysis device main body, 11.12...
Attenuator, 13.14...A/D converter, ]5.
...Bus, 16...CPU, 16-1...Signal acquisition means, 16-2...Discharge data creation means, 16-3.
・Discharge classification - Y stage, 16-4...Discharge carp analysis means, 16
-5... History creation means, 16-6... Histogram creation means, 16-7... Analysis calculation means, 17... Timing controller, 18... RAM, 19...
ROM. 20... Display drive unit, 21... Printer drive unit, 2
2...Manual operation unit, 23...Display device, 24...
printer.

Claims (1)

[Claims] A detector that detects the discharge voltage and discharge current to the workpiece and the discharge electrode, and a signal acquisition means that converts the detection signal from the detector into a digital signal at a predetermined sampling period and captures the signal at regular intervals. and discharge data creation means for creating discharge data consisting of the discharge voltage, etc. in each discharge from each detection signal collected by the signal collection means, and a discharge data creation means for creating discharge data consisting of the discharge voltage, etc., created by the discharge data creation means. Equipped with a discharge classification means for classifying into normal discharge, abnormal discharge, etc., and a discharge analysis means for calculating the efficiency of electrical discharge machining from the classification results by the discharge classification means and the discharge data created by the discharge data creation means. A discharge state analysis device characterized by: