JPH0335932A - Machining state reporting device - Google Patents

Abstract

PURPOSE:To discriminate and display an electric discharge machining state by providing a means which analyzes the discharge state of an electric discharge machining device from a digital detecting signal sampled at a sampling period and reports an analyzing result together with a machining state decided by a deciding means at a measuring range. CONSTITUTION:A discharge voltage and a discharge current to an electric discharge machining device are detected by means of detectors 7 and 8. Signals therefrom are digitally converted and inputted by the signal sampling means of a CPU 16. The peak value of the digital detecting signal is compared with a threshold by means of the deciding means of the CPU 16 to decide a machining state. Further, a measurement range and the sampling period of the signal sampling means are varied and set according to a current peak value by means of a range varying means. Based on a digital detecting signal sampled at the sampling period, a discharge state at the electric discharge machining device is analyzed by a machining state reporting means 21, and an analyzing result is reported at a measurement range and together with a decided machining state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a machining state notification device that displays information in accordance with the machining state.

(Prior Art) Electrical 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 predetermined intervals with respect to the workpiece. The workpiece and the wire electrode are penetrated into a processing bath, and in this state, a DC voltage is applied between the workpiece and the wire electrode. Then, for example, when the wire electrode is brought close to the workpiece and the gap amount becomes a predetermined amount, electric discharge occurs between the wire electrode and the workpiece. However, the workpiece is machined by this discharge energy.

In such wire AK 71i machining, the quality of the machining state is judged based on the quality of the discharge state, and this judgment is made by the following method. That is, (1) the worker visually observes the discharge column and determines whether the discharge condition is good based on experience or intuition based on the brightness of the discharge column;

■A worker listens to a piece of discharge and uses experience and intuition to judge whether the discharge condition is good or not.

■61 onroscopes are added to the wire discharge deviceC
If so, the onroscope is used to display, for example, waves of applied voltage and discharge current between the wire electrode and the other object, and the discharge state is determined from these applied voltages and discharge current.

■・If the Noiya electrical discharge machining equipment has a standard set in advance for determining the discharge state and the quality of the condition, then the discharge state is determined according to this standard.
Ill Ili.

However, in each of the above methods, the discharge is normal and 1/, j
Although the normal state can be determined, it is not possible to distinguish whether the electrical discharge machining currently being performed is rough machining or finishing machining. Furthermore, it is impossible to display the electrical discharge machining status, such as the generation rate of undischarged pulses, depending on the rough machining and finishing machining. Note that this is true not only for wire electrical discharge machining but also for electrical discharge "nickel acid".

(Problems to be Solved by the Invention) As described above, it is not possible to determine whether the electrical discharge machining currently being performed is rough machining or finishing machining, and it is difficult to distinguish between rough machining and finishing pressurization. It was difficult to display the electrical discharge machining status.

Therefore, an object of the present invention is to provide a machining state notification device that can determine the electrical discharge machining state and display the electrical discharge machining state according to the electrical discharge machining state.

[Structure of the Invention] (Means for Solving the Problems) The present invention relates to electric discharge machining equipment/group 71S? 8 a detector for detecting voltage and discharge current; a signal acquisition means for simultaneously converting the detection signal from the detector into digital data at a predetermined sampling period during a signal acquisition period at regular intervals and acquiring the signal; A processing state determining means determines the processing state by determining the peak value of the collected digital detection signal and compares this peak value with a preset threshold; Range changing means changes the measurement range according to the peak value of the detection signal and changes the sampling period in the signal acquisition means; Analyze the discharge state in the device based on the digital detection signal collected periodically, and change the results of this analysis with the range change means, together with the machining state determined by the machining state determination means in the set measurement range. This is a machining state notification device that attempts to achieve the above object by including a machining state B notification means for notifying the user.

(Function) By providing such a means, the discharge side 1, equipment and
The discharge voltage and discharge current of ＼ are detected, digitally converted and taken in by the first stage of signal acquisition, and the peak value of the digital detection signal and the threshold value are compared by the machining state determination means, and the 111 degree of deafness is determined. At the same time, the measurement range and the sampling period in the signal acquisition means are changed and set by the range changing means according to the current peak value. Then, the processed state is obtained from the digital detection signal collected at the changed sampling period! r3 notification means is h
The electric discharge state in the electric JJI equipment is analyzed and the analysis result is notified together with the machining state determined by the machining state determining means in the measurement range changed by the range changing means.

(Example) Hereinafter, drawings of an example of the present invention will be described. ! Let me explain.

FIG. 1 is an overall configuration diagram of a processing state notification device applied to wire processing equipment. A workpiece 2 is penetrated into the inside of the processing tank 1, and wire electrodes 3 are arranged on the 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). These workpieces 2 and wire electrodes 3
A DC power supply 6 is connected between the two 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 in series to the DC power source 6.

On the other hand, 10 is a notification device main body, and this notification device main body 10 is equipped with attenuators (ATT) 11 and 12, and a voltage detector 7 is connected to one of the attenuators 11.
A current detector 8 is connected to the other attenuator 12 . These attenuators 11. ．． &A/D (analog/digital) converters 13 and 14 each having a built-in memory are connected to each of these A/D converters 13.12.
14 is a CPU (central processing unit) 16 via a bus 15.
It is connected to the. A timing controller 17, a RAM (Random Access Memory) 18, a ROM (Read Only Memory) 19, and a display drive unit 20 are connected to the CPU 16 via a bus 15. The timing controller 17 controls the signal acquisition timing in the A/D converters 13 and 14. Further, a display device 21 is connected to the display drive section 20.

The ROM 19 stores a discharge analysis program that calculates discharge data such as discharge start time, discharge end time, current peak value, and pulse interval from the discharge voltage and discharge current that has been taken in, and determines whether the discharge is good or bad from this discharge data. has been done. The ROM 19 also stores a signal acquisition timing program for the A/D converters 13 and 14 in the timing controller 17. However, due to this signal acquisition timing program, &A/D converter 13゜14
For example, for each xns or yns, the voltage detection signal and current detection signal are each digitally converted to 8 bits and captured, for example, 1024 to 655 bits in one signal acquisition period.
36B data will be collected.

Then, the interval of this signal sampling period is set every fixed period ΔH. As a result, each A/D converter 13, 1
4, CPU 16, timing controller 17 and RO
M19 constitutes a signal acquisition means.

Furthermore, the ROM 19 stores the peak value of the sampled digital voltage detection signal and digital current detection signal, compares this peak value with a preset threshold value, and if the peak value is larger than the threshold value, the signal is A machining state determination program that determines machining and finishes machining if the peak value is smaller than a threshold, and each peak value of discharge voltage or discharge current from the collected digital voltage detector 7 or digital current detector No. 13. are calculated, and these peak values are calculated as each A/
In addition to changing the settings to each measurement range that has a predetermined percentage, for example, 40% or more of the full scale of the measurement range when reading in with the D converter 13.14, if the machining state determined above is rough machining, the A/ Change the setting of the sampling period of D converter 13.14 to xns, and change the sampling period of A/D converter 13.14 to y for finishing machining.
A range change program for changing settings to ns is stored.

Furthermore, the ROM 19 analyzes the discharge state in wire electrical discharge machining from the digital voltage detection signal or digital current detection signal collected at the sampling period that has been changed, and also uses the measurement range that has been changed and determined the analysis result. A processing state notification program to be displayed on the display 21 together with the processed state is stored.

Next, the operation of the apparatus constructed as described above will be explained with reference to the discharge state display flowchart shown in FIG.

In step sl, the CPU 16 determines that 'Ap+ constant range is the maximum measurement range, for example, the current measurement range is 0 to 1000.
Press A to set the voltage measurement range to 0 to 100OV. As a result, each A/D converter 13, 14 digitally converts, for example, a current detection signal in a measurement range of 0-1000A in 8 bits.

Next, the CPU 16 moves to step s2 and collects a voltage detection signal and a current detection signal. That is, a pulsed DC voltage is applied between the workpiece 2 and the wire electrode 3 from the DC power supply 6 through the discharge control circuit 5, and in this state, the workpiece 2
When the gap amount between the wire electrode 3 and the wire electrode 3 reaches a predetermined value, a pulse discharge is generated between the workpiece 2 and the wire electrode 3. The energy/l of this pulse discharge, the workpiece 2
is processed.

In this state, the voltage detector 7 connects the workpiece 2 and the wire 71it.
! The current detector 8 detects the pulsed DC voltage applied between the IA 3 and outputs the voltage detection signal, and the current detector 8 detects the pulsed discharge current flowing from the workpiece 2 to the wire electrode 3 and detects the current. Output a signal.

These voltage detection signals and current detection signals are attenuated by attenuators 11 and 1.2, respectively, to a level that is easy to process, and then sent to A/D converters 13.14.

At this time, the A/D converters u13 and 14 are both controlled by the timing controller 17, and simultaneously output voltage detection signals and current detection signals every 50 ns, for example, during each signal acquisition period H, H2, etc. shown in FIG. (L is the above voltage range 0~1ooov, current range l!lI0
~ll100A A) Digitally convert to 8 bits using the J setting range and import. With this, for example, 1024 to 055 in one signal acquisition period, for example, signal acquisition period Hl.
38B data is imported. Then, these signal sampling periods H, H2, . . . arrive every -invention period. In this way, the digital voltage detection signal and digital current signal acquired during one signal acquisition period, for example, Hl, are temporarily stored in the memory in each A/D converter 13, 14, and are stored during the signal acquisition period. After Hl has elapsed, the CPU 16 transfers it to the RAM 2S and stores it.
At the next signal sampling period H2, each A/D converter 13.1
When the digital voltage detection signal and the digital current signal No. 4 are temporarily stored in the RAM 18, the CPU 16 moves the digital voltage detection signal and the digital current signal No. Remember.

In this way, the digital voltage detection signal and the digital current signal are captured and stored in the RAM 18, and the number "(j
When the signal sampling period l ends, cptz6 moves to step m3 and determines the machining state. That is, CPU
1.6 follows the machining state determination flowchart shown in FIG. 4, and in step ``1'' calculates the current swing value from the digital current detection signal stored in the RAM 18, and in the next step m3, compares this current peak value with the threshold value. As a result of this comparison, if the current peak value is larger than the threshold value, the CPU 16 moves to step 1''3, determines that the current process is S R'l electric stress machining, and also determines that the current peak value is greater than the threshold value. If it is larger than the threshold, the CPU 16 moves to step m3 and separates electrical discharge machining from finishing machining.

Next, CPU], 6 sets the measurement record 2' in step m4. That is, the CPU 16 is shown in FIG.
In step m3, a current peak and a voltage peak are determined from each digital voltage detection signal and digital current signal stored in the RAM 18 according to the six range change flowcharts. Next, in step 1i2, the CPU 16 determines that the current peak value is within the current range of 0 to 100OA in the 1P1 constant range.
It is determined whether a predetermined ratio, for example 40% or more, is higher than the specified ratio. Here, the current peak value is 150A as shown in Figure 6.
, this current peak value is within the current range 0~100OA
40% or less, the CPU 16 moves to step m3 and lowers the M1 constant range by one range to set the seventh
Change to the lP1 constant range with a current range of 0 to 400 A as shown in the figure. In step 112, the Fir and CPU 16 select the current range 0 to 40 of the tS current peak value measurement range.
It is determined whether it is 40% or more with respect to 0A. In this case as well, the current peak value is 40 A for the current range O~400 A.
Since it is 96 or less, the CPU 16 moves to step m3 again and further lowers the Al1j constant range by one range to change the Apl constant rare range in the current range O to 20OA as shown in FIG. Thus, the current peak value is within the current range 0
~40% or more for 20OA, 1% of the current range
1 constant range is set to 0-200A. Next, CPU1
Step 6 sets the measurement range for voltage in the same way as the API constant rare range of the current range was set in steps m4 and -5.

Next, the CPU 16 moves to step m6 and determines whether the electrical discharge machining state determined above is rough machining or finishing machining 11, and if it is rough machining, the CPU 16 moves to step m7 and each A/D
Set the sampling period of converters 13 and 14 to xns, and for finishing pressurization, move to Stellaf 1B and check each A/D.
The sampling period in converters 13 and 14 is set to yns. FIG. 9 shows the sampling period xns, yns
For example, it shows the sampling timing of the discharge current.

After that, the CPU 16 moves to step S5, and if the electrical discharge machining state is rough machining, the current detection signal is outputted every x, ns in the current range O to 20OA during each signal acquisition period HH2...
Digitally convert it to 8 bits in the API fixed range and import it, and change the voltage detection signal and import the set IP + constant rare range. Then the signal acquisition period is repeated several times, for example 10
When the number of discharges has arrived, the CPU 16 moves to step S6 and calculates the number of discharge occurrences, discharge start time, discharge end time, discharge voltage, current peak, current pulse width, discharge energy, pulse interval, etc. from each digital voltage detection signal and digital current signal. Discharge data is obtained, and efficiency, stability, etc. are calculated from this discharge data. Then, in step S7, the CPU 16 sends the discharge machining state, for example, rough machining, to the display drive section 20 to display it on the display 21, and also sends discharge data, efficiency, etc. to the display drive section 20, and displays it on the display 21.
to be displayed. FIG. 1O is an example of such a display, in which <Rough machining> is displayed, and the number of discharge occurrences and the proportion of normal (effective) discharges among the discharges that have occurred are displayed as the quality of the discharge. Here, since the sampling period of the current and voltage detection signal is different between rough machining and finishing machining, the sampling period corresponding to the machining is also displayed for the number of discharge occurrences.

In this way, in the above embodiment, the discharge voltage and discharge current are detected, and based on the peak values and threshold values of these discharge voltages and discharge currents, it is determined whether rough machining or finishing machining is to be performed, and the measurement is performed according to the peak values. The range and sampling period are changed and set, and the discharge state is analyzed from the digital detection signal collected at the changed sampling period, and this analysis result is displayed as the changed lpj constant rare range, and whether it is rough machining or finishing machining. This allows you to easily check whether the current layered electrical discharge machining is rough machining or finishing.In addition, the state of electrical discharge machining can be accurately determined from the number of discharge occurrences, current peak value, efficiency, etc. I understand. Therefore, even if the sampling period of each detection signal is different between rough machining and finish machining, the electrical discharge machining state can be determined separately for rough machining and finish machining.

Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without departing from the spirit thereof. Accordingly, signal acquisition period II, H2... and these periods H1, H2
The sampling period in ... may be set to 114. Further, the machining status of rough machining or finishing machining and the status of electric discharge machining may not only be displayed on the display 21 but also may be printed out using a printer. Furthermore, this equipment is not limited to wire electrical discharge machining equipment, but also die-sinker electrical discharge machining, electrolytic machining, etc.
Furthermore, by changing the sampling range of voltage and current signals, welding machines, laser application equipment, lighting equipment, sputtering equipment, PVD, etc. It can also be applied to electrical discharge application equipment such as CVD plasma processing equipment. Among these, in sputtering equipment, the flow rate of the discharge medium can be increased by detecting the discharge state.
! I can arrange things.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a machining state notification device that can determine the electrical discharge machining state and display the electrical discharge machining state according to the electrical discharge machining state.

4. ffTltit explanation of the drawings FIGS. 1 to 10 are diagrams for explaining one embodiment of the crane machining state notification device according to the present invention, and FIG. 1 is an overall configuration diagram, and FIG. is a machining status notification flowchart, Figure 3 is a schematic diagram showing the signal collection period, Figure 4 is a machining status determination flowchart,
Figure 5 is a flowchart for changing 1 (III constant range), Figures 6 to 8 are diagrams for explaining the change setting of ilP + constant range, Figure 9 is a schematic diagram showing the sampling period, and Figure 1O is a table. It is a figure which shows an example.

DESCRIPTION OF SYMBOLS 1... Processing tank, 2... Workpiece, 3... Wire electrode, 4... Upper wire guide body, 5... Discharge 111
Circuit, 6... DC power supply, 7... Voltage detector, 8...
・7tS flow detector, 10... Notification device main body, 11.1
2... Attenuator, 13.14... A/D converter, 15... Bus, 16... CPU, 17... Timing controller, 18... RAM, 19... R
OM, 20...Display drive section, 21...Display device.

No. 2 Nshi No. figure No. flash 1 No. figure time No. figure time No. figure No. figure

Claims (1)

[Claims] a detector for detecting a discharge voltage and a discharge current to the electrical discharge machining equipment; a signal acquisition means for simultaneously converting the detection signal from the detector into digital data at a predetermined sampling period in a signal collection period at regular intervals and capturing the signal; machining state determining means for determining the machining state by determining the peak value of the digital detection signal collected by the signal collecting means and comparing this peak value with a preset threshold value; range changing means for determining the peak value of the detected digital detection signal and changing the measurement range according to the peak value, and changing and setting the sampling period in the signal sampling means; Analyzing the electrical discharge state in the electrical discharge machining equipment from digital detection signals collected periodically, and applying the analysis results together with the machining state determined by the machining state determining means in the measurement range changed by the range changing means. A machining state notification device comprising a machining state notification means for notifying.