JP3367345B2 - Wire electric discharge machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electric discharge machine.

[0002]

2. Description of the Related Art FIG. 9 is a diagram showing the overall structure of a wire electric discharge machine. In the figure, 1 is a wire electrode, 2 is a workpiece, 3 is a wire guide that guides the wire electrode 1 at the upper and lower portions, 4 is a table on which the workpiece 2 is placed, 5a and 5b are the wire electrode 1 and the workpiece. X-axis and Y-axis drive motors that move relative to the workpiece 2; 6 an axis drive control device that controls the X-axis and Y-axis drive motors 5a and 5b; 7 a machining gap between the wire electrode 1 and the workpiece 2; , A machining power supply for supplying a discharge current pulse to the wire electrode 8, a power supply for supplying the output of the electric discharge machining power supply device 7 to the wire electrode 1, and a machining power supply control device 9 for controlling the switching operation of the electric discharge machining power supply device 7. Reference numeral 10 is an inter-electrode voltage detection device that detects machining voltage between the electrodes, 11 is an NC control device that sends an axis movement command and machining condition parameters to the axis drive control device 6 and the machining power supply control device 9, and 12 is an NC program. It is a non.

FIG. 10 is a diagram showing an example of a machining power supply device and a machining gap voltage detection device, and 700 is an electric discharge machining power supply circuit corresponding to 7 in FIG. 9 for supplying machining current between the machining gaps. The DC power source 701, the switching element 702 that is turned on / off by the processing power source control device 9, and the limiting resistor 703 that limits the current value flowing between the electrodes. Reference numeral 1000 denotes an inter-electrode voltage detecting device corresponding to 10 in FIG. 9, which includes a voltage rectifying diode 1001, voltage dividing resistors 1002 and 1003, a voltage smoothing capacitor 1004, and an inter-electrode voltage detecting circuit 1005. There is. Moreover, 13 has shown the impedance which exists in a feed route.

Next, the operation will be described. NC device 11
Processing route information and processing electrical condition parameters are input to the NC program 12 or an operation panel (not shown). The input machining electrical condition parameters are output to the machining power supply controller 9, and the machining power supply controller 9 generates a drive signal having a predetermined current peak, pulse width, and pause time based on these parameters. The machining power supply device 7 is controlled. The machining power supply device 7 is driven by this drive signal, and a predetermined current pulse is supplied to the machining gap between the wire electrode 1 held by the wire guide 3 and the workpiece 2 above and below the workpiece 2. At the same time, generally, water or a water-based machining liquid is supplied to the machining gap to perform electric discharge machining.

FIG. 11 is a diagram showing a waveform between electrodes.
(A) shows the processing voltage, and (b) shows the processing current. After the switching element 702 in FIG. 10 is turned on, the machining gap voltage rises to the voltage E1 of the DC power source 701 as shown in (a) until the discharge starts, and the machining gap voltage decreases to the arc potential E2 as the discharge starts. . At this time, the voltage detection circuit 10 in FIG. 9 detects that the machining gap voltage has dropped to the arc potential, determines that the discharge has started, and outputs it to the machining power supply controller 9, and as shown in FIG. T
The switching element 702 continues to be in the ON state (while ON), and the machining current determined by the voltage E1 of the DC power supply 701 and the constant of the limiting resistor 703 is supplied to the machining gap. After that, the switching element 702 is turned off, and the predetermined time (TO
During the FF period, the off time is continued and the switching element 702 is turned on again to repeat the above-mentioned operations to generate the discharge between the wire electrode and the workpiece.

At the same time, the NC device 11 outputs a positioning command to the drive control device 6 based on the machining path information to drive the X-axis drive motor 5a and the Y-axis drive motor 5b to control the positioning of the table 4. By doing so, the workpiece is processed into a desired shape. The inter-electrode voltage is half-wave rectified by the voltage rectifying diode 1001, divided by the voltage dividing resistors 1002 and 1003, smoothed and averaged by the voltage smoothing capacitor 1004, and the inter-electrode voltage detection circuit 1005 is used. To be detected. In this way, the inter-electrode voltage detecting device 1000 determines the inter-electrode state such as open, discharge, short circuit, etc. based on the value of the inter-electrode voltage.
In order to perform more stable electric discharge machining, the wire electrode 1 and the workpiece 2 are moved relative to each other so as to have a predetermined voltage.

[0007]

The conventional wire electric discharge machine is constructed as described above, and electric discharge machining is performed once
This is done by accumulating discharges. Therefore, when considering the improvement of the processing speed, it becomes necessary to increase the frequency of the discharge pulse. However, if the discharge frequency is increased, the impedance 13 of the power feeding path increases. For example, the value of the impedance 13 is Z, the resistance value of the limiting resistor 703 is R, the voltage of the DC power source 701 is E1, and the voltage between contacts is When Eg, the voltage between aa ′ in FIG.
Z / (R + 2Z)) * E1 + (1-2Z / (R + 2
Since Z)) * Eg is expressed, the increase of the impedance Z results in that the machining gap voltage detection differs depending on the processing state, and has a significant influence on the machining gap voltage detection.

For example, in the case of low frequency electric discharge machining, the impedance 13 of the power feeding path can be ignored and the voltage between aa and a'is Eg (voltage between electrodes) regardless of the state between the electrodes. However, in high-frequency electric discharge machining, the impedance 13 of the power feeding path cannot be ignored, and the voltage between a and a'is E1 if the gap between the electrodes is open, but even if a short circuit occurs (2Z / (R + 2Z)) * E1 and a voltage exist, making it difficult to detect a short circuit. Further, the detected value of the voltage between contacts during discharging is not the relative value of the actual voltage between contacts, and there is a problem that the relative movement of the wire electrode 1 and the workpiece 2 cannot be performed appropriately.

The present invention has been made to solve the above problems, and in a wire electric discharge machine,
It is an object of the present invention to be able to accurately detect the state of the gap and perform stable electric discharge machining regardless of the frequency of the power supply device for electric discharge machining.

[0010]

According to a first aspect of the present invention, there is provided a wire electric discharge machining apparatus in which a voltage is applied from a machining power supply device to a gap formed by a wire electrode and a workpiece to generate an electric discharge. In a wire-cut electric discharge machining device for machining a workpiece by relatively moving a wire electrode and the workpiece, independently of the machining power supply device ,
A contact detection device that incorporates a power supply for supplying a voltage for detecting contact between the electrodes and that detects contact between the wire electrode and the workpiece, and an output signal of the contact detection device. A contact state detecting device for outputting contact state information between the wire electrode and the workpiece is provided.

In the wire electric discharge machining apparatus according to the second aspect of the present invention, a voltage is applied from a machining power supply unit to a gap formed between the wire electrode and the workpiece to generate an electric discharge, and
In a wire-cut electric discharge machining device for machining the workpiece by moving the wire electrode and the workpiece relative to each other, a contact between the electrodes is detected independently of the machining power supply device.
A contact detection device that has a built-in power supply for supplying a voltage for outputting and that detects contact between the wire electrode and the workpiece, and the wire electrode and the detection target by using an output signal of the contact detection device. A contact state detecting device for outputting contact state information with the workpiece, and a gap distance calculating means for obtaining a distance between the wire electrode and the workpiece using the contact state information. .

In the wire electric discharge machining apparatus according to the third aspect of the invention, a voltage is applied from a machining power supply unit to a gap formed between the wire electrode and the workpiece to generate an electric discharge, and
In a wire-cut electric discharge machining device for machining the workpiece by moving the wire electrode and the workpiece relative to each other, a contact between the electrodes is detected independently of the machining power supply device.
A contact detection device that has a built-in power supply for supplying a voltage for outputting and that detects contact between the wire electrode and the workpiece, and the wire electrode and the detection target by using an output signal of the contact detection device. A contact state detection device that outputs contact state information with the workpiece, and a machining feed rate is controlled based on an output signal of the contact state detection device so that the contact state between the wire electrode and the workpiece becomes a predetermined state. And a control device that operates.

A wire electric discharge machine according to a fourth aspect of the present invention is the wire electric discharge machine according to any one of the first to third aspects, wherein the contact state information between the wire electrode and the workpiece output by the contact state detecting device is This is the ratio of the time occupied by the contact state to the predetermined time.

A wire electric discharge machine according to a fifth aspect of the present invention is the wire electric discharge machine according to the second aspect of the present invention, in which the distance calculation means calculates at least one of the plate thickness of the workpiece or the tension of the wire electrode as a parameter. It is something that is done.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described with reference to the drawings. 1 is a diagram showing details of a control circuit of a wire electric discharge machine according to Embodiment 1 of the present invention. Description of parts similar to those of the conventional example shown in FIGS . 9 and 10 will be omitted.

In the figure, reference numeral 100 is a contact detection circuit for detecting contact between electrodes, 101 is a DC power supply for supplying a voltage to detect contact between electrodes of the contact detection circuit 100, and 102.
Is a switching element for turning on and off the detection circuit, 103
Is a resistor for suppressing the circuit current of the detection circuit, 104 is a photocoupler composed of an input photodiode 104a and an output phototransistor 104b, 105 is a diode for protecting the photocoupler 104, and 106 is a current flowing through the photocoupler 104. A resistor, which determines
107 is a diode for preventing the machining current between electrodes from flowing back to the contact detection circuit, and 108 is a photocoupler 104.
Is an AND circuit for receiving the output of the photocoupler 104 by judging that the output of the photocoupler 104 is contact, 110 is a contact detection sampling pulse generating circuit for controlling the switching element 102, and 111 is for driving the switching element 102. Drive circuit, 112 is NO
A pulse delay circuit that outputs a detection count pulse composed of the T circuit 112a / 112b, an AND circuit 112d, and a capacitor 112c, and 113 is an AND circuit that outputs a contact detection count pulse.

Further, 200 is a contact state detecting device for detecting the contact state between the wire electrode and the workpiece, 201 is a decimal counter for counting the detection count pulse, 2
Reference numeral 02 denotes a decimal counter that counts contact detection count pulses; 203, a latch circuit that latches the counter output of the decimal counter 202; 204, a contact rate detection device that determines the contact state from the output of the latch circuit;
It is a pulse delay circuit that resets the count values of the decimal counters 201 and 202 that are configured by the circuits 205a / 205b and the capacitor 205c.

Next, the operation of the first embodiment will be described with reference to the drawings. 2 and 3 are diagrams showing an example of output signals of the respective parts of FIG. 1, and FIG. 2 also shows contact / non-contact states between the electrodes. 2 and 3, a signal A is a contact detection sampling pulse of the contact detection sampling pulse generation circuit 110, and a signal C is an AND circuit 109.
Contact detection output, a signal D is a detection count pulse output from the pulse delay circuit 112, and a signal E is an AND circuit 11.
The contact detection pulse 3 and signals F to I are decimal counter 20
The counter outputs Q0 to Q3 of 2, the signal J is a carry output of the decimal counter 201, and the signal K is a counter reset pulse which is output from the pulse delay circuit 205 and resets the count values of the decimal counters 201 and 202.

Here, the signal A is a pulse for performing contact detection sampling at a frequency (for example, several hundred Hz to several tens kHz) at which the impedance 13 of the power feeding path can be ignored, and the switching element 102 drives the drive circuit 111.
Thus, the voltage of the DC power supply 101 is supplied to the wire electrode 1 and the workpiece 2 via the resistor 103 / diode 107 / power supply 8 when the switching element 102 is turned on / off at the timing of the signal A and the switching element 102 is turned on. .

If the wire electrode 1 and the work piece 2 are in contact with each other, the resistance value of the resistor 106 is sufficiently larger than the contact resistance, and therefore the photodiode 104a on the input side of the photocoupler 104 is provided. Almost no current flows through the phototransistor 104, the phototransistor 104b on the output side of the photocoupler 104 is in a high impedance state, and the contact detection output signal B becomes H level by the pull-up resistor 108.

When the wire electrode 1 and the workpiece 2 are not in contact with each other, the current of the DC power source is the resistor 103/10.
A current flows through the photodiode 104a, which is the input side of the photocoupler 104, via 6 to turn on the phototransistor 104b, which is the output side of the photocoupler 104, and the contact detection output signal B becomes L level.

When the switching element 102 is off, no current flows through the photodiode, which is the input of the photocoupler 104, as in the contact state between the wire electrode 1 and the workpiece 2 and the contact detection is performed. The output signal B becomes H level by the pull-up resistor 108.

Next, as shown in FIG. 3, the pulse delay circuit 1
In FIG. 12, the delay circuit composed of the NOT circuits 112a / 112b and the capacitor 112c is used to
The signal A is a delayed signal such as the signal L at a delay time determined by the internal resistance of 2a / 112b and the electrostatic capacity of the capacitor 112c.
It is input to the D circuit 112d and outputs a pulse delay signal as shown by the signal D in FIG. Further, the contact detection output signal C is at the H level or the L level when the signal L is at the H level, and the output signal E of the AND circuit 113 outputs the H level as shown in FIG.

That is, the output signal D of the contact detection circuit 100
And the output signal E is the contact detection sampling pulse signal A
Is output, the output signal D is output as a contact detection sampling count pulse, and the contact detection pulse signal E is output when the gaps are in contact with each other.

Next, the signal J output from the carry of the decimal counter 201 is output when the counter value is 10 and becomes the H level, latches the latch circuit 203 and outputs the signal K through the pulse delay circuit 205 to output 10 signals. The binary counters 201 and 202 are reset. In this way, the counter outputs Q0 to Q3 of the decimal counter 202 can continuously count the contact state between the poles.

Here, the contact state between the electrodes is shown in FIGS. 4 and 5, but since a wire having no rigidity is used for the machining electrode, the mesh electrode in FIG. The wire electrode vibrates in a complicated manner due to the repulsive force of electric discharge machining. FIG. 4A shows a state in which the distance between the wire electrode and the workpiece is far apart due to the vibration of the wire electrode, and no contact occurs between the wire electrode and the workpiece even during electric discharge machining. (B)
In this case, the gap between the electrodes becomes narrower, contact state begins to occur between the wire electrode and the workpiece, and contact / non-contact is repeated.
The smaller the distance between the electrodes is, the more the number of contacts is increased. When the distance between the electrodes is further reduced, the wire electrode and the workpiece are always in contact with each other, that is, in a short-circuited state, as shown in FIG.

As shown in FIGS. 5 (A) and 5 (B), the contact ratio between the wire electrode and the work piece varies depending on the distance between the electrodes. For example, since the inter-electrode distance is farther and the inter-electrode distance is narrower as the contact rate increases, the inter-electrode distance can be determined by knowing the contact rate during electric discharge machining.

Further, as shown in FIG. 5 (A), the gap distance for the same contact rate varies depending on the plate thickness of the workpiece, and the gap distance increases as the plate thickness of the workpiece increases even with the same contact rate. You can see that it is narrower and thinner and wider. Also,
As shown in FIG. 5B, the inter-electrode distance for the same contact rate differs depending on the tension of the wire electrode. Even if the wire electrode tension is strong, the inter-electrode distance is narrow, and if the wire contact tension is weak, the inter-electrode distance is wide. Recognize. That is, if the plate thickness of the workpiece and the tension of the wire electrode are known, the contact distance can be accurately determined from the contact rate.

In the present embodiment, the decimal counter 202
The latched values of the counter outputs Q0 to Q3 indicate the contact rate, and the contact state detecting device 204 can detect the contact state between the electrodes, and the distance between the electrodes can be known and detected based on this contact state. The contact state and distance between the electrodes can be taken into the NC control device 11 to control the machining feed rate of the wire electrode 1 and the workpiece 2.

For example, the machining feed rate in the NC control device 11 can be controlled by a feedback system as shown in FIG. In the figure, 301 is a transfer function G1 for calculating the machining feed speed based on the deviation between the target value of the contact ratio and the actual contact ratio, 302 is a transfer function G2 for calculating the machining gap distance based on the machining feed speed, and 303 is the machining gap. It is a transfer function G3 that calculates the contact rate based on the distance, and corresponds to the contact state detection device of the present embodiment.

Here, the inter-electrode distance of the control system changes depending on the machining state, and it is added as a disturbance, and if the machining progresses beyond the machining feed rate, the inter-electrode distance becomes wider, the contact rate decreases, and the contact rate target value becomes Since the deviation of the detected contact rate becomes large,
Machining feed speed becomes faster. Further, if the machining feed rate is faster than the machining, the distance between the electrodes becomes narrower, the contact rate becomes higher, and the deviation between the target value of the contact rate and the detected contact rate becomes smaller, so that the machining feed rate becomes slower. In this way, by setting the target value of the contact rate, it becomes possible to easily control the machining feed rate even if the machining state changes.

The transfer function G3 in FIG. 6 is as shown in FIG.
As is clear from (B), the plate thickness of the workpiece and the wire tension change as parameters. FIG. 7 is a table showing this, and shows which transfer function should be used for the four types of plate thickness of the workpiece and the four values of the wire tension. In the actual case, these are stored in advance in the memory in the control device or the contact state detection device, and are automatically selected when the plate thickness and the wire tension are applied.

Embodiment 2. In the first embodiment, as shown in FIG. 1, only one stage of the decimal counter is used, but by connecting a plurality of cascades as shown in FIG. 8, the counter outputs Q0 to Q3 at the final stage of the decimal counter are obtained. It can be an averaged value. For example, when the decimal counter is used in three stages, the contact count of 202c is latched when the count of 201c is 1000, so that the population parameter in the first embodiment is 10
On the other hand, the parameter can be set to 1000.

Further, although the contact ratio is used as the parameter representing the contact state in the first and second embodiments, the present invention is not limited to this, and other parameters representing the contact state such as, for example, It is obvious that the number of contact pulses within a fixed time may be used.

[0035]

According to the wire electric discharge machining apparatus of the first invention, a voltage is applied from a machining power supply unit to a gap formed by a wire electrode and a workpiece to generate an electric discharge.
In a wire-cut electric discharge machine that processes a workpiece by moving the wire electrode and the workpiece relative to each other, a voltage for detecting contact between the electrodes independently of the machining power supply device.
And a contact detection device that detects the contact between the wire electrode and the workpiece, and outputs the contact state information between the wire electrode and the workpiece using the output signal of this contact detection device. It is possible to detect the contact state between the wire electrode and the workpiece without being influenced by the frequency of the electric power source for electric discharge machining.

In the wire electric discharge machining apparatus according to the second aspect of the present invention, a voltage is applied from a machining power supply unit to a gap formed between the wire electrode and the workpiece to generate an electric discharge.
In a wire-cut electric discharge machine that processes a workpiece by moving the wire electrode and the workpiece relative to each other, a voltage for detecting contact between the electrodes independently of the machining power supply device.
And a contact detection device that detects the contact between the wire electrode and the workpiece, and outputs the contact state information between the wire electrode and the workpiece using the output signal of this contact detection device. Since it has the contact state detection device and the machining distance calculation means for obtaining the distance between the wire electrode and the workpiece using the contact state information, the wire electrode is not affected by the frequency of the electric power source for electric discharge machining. It is possible to detect the contact state with the workpiece and to know the distance between the wire electrode and the workpiece.

In the wire electric discharge machining apparatus according to the third aspect of the present invention, a voltage is applied from a machining power supply unit to a gap formed between the wire electrode and the workpiece to generate an electric discharge, and
In a wire-cut electric discharge machine that processes a workpiece by moving the wire electrode and the workpiece relative to each other, a voltage for detecting contact between the electrodes independently of the machining power supply device.
And a contact detection device that detects the contact between the wire electrode and the workpiece, and outputs the contact state information between the wire electrode and the workpiece using the output signal of this contact detection device. Since it has a contact state detecting device, and a control device for controlling the machining feed speed so that the contact state between the wire electrode and the workpiece based on the output signal of the contact state detecting device is controlled, It is possible to realize a machining feed rate suitable for the machining gap condition regardless of the frequency of the electric power source for electric discharge machining.

A wire electric discharge machine according to a fourth aspect of the present invention is the wire electric discharge machine according to any one of the first to third aspects of the present invention, wherein contact state information between the wire electrode and the workpiece output by the contact state detecting device is output. Since the ratio of the time occupied by the contact state to the predetermined time is set, it is possible to represent the contact state with a single data, which facilitates control.

A wire electric discharge machining apparatus according to a fifth aspect of the present invention is the wire electric discharge machining apparatus according to the second aspect of the present invention, wherein the machining distance calculation means calculates at least one of the plate thickness of the workpiece or the tension of the wire electrode as a parameter. As a result, the distance between the wire electrode and the workpiece can be kept constant regardless of the plate thickness of the workpiece and the tension of the wire electrode, enabling stable and highly accurate wire electrical discharge machining. To do.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a wire electric discharge machining apparatus according to a first embodiment.

FIG. 2 is a timing chart showing an operation of a control circuit output signal of the wire electric discharge machining apparatus according to the first embodiment.

FIG. 3 is a timing chart showing an operation of a control circuit output signal of the wire electric discharge machining apparatus according to the first embodiment.

FIG. 4 is a diagram illustrating a contact state between a wire electrode and a pole of the wire electric discharge machining apparatus according to the first embodiment.

FIG. 5 is a diagram showing the relationship between the contact rate and the inter-electrode distance in the wire electric discharge machining apparatus according to the first embodiment.

FIG. 6 is a block diagram of a control system of the wire electric discharge machining apparatus according to the first embodiment.

FIG. 7 is a diagram showing a transfer function that changes using plate thickness and tension as parameters.

FIG. 8 is a control circuit connection diagram of the second embodiment.

FIG. 9 is a configuration diagram of the entire wire electric discharge machine.

FIG. 10 is a circuit diagram of a conventional inter-electrode voltage detecting device.

FIG. 11 is a diagram showing a waveform between electrodes.

[Explanation of symbols]

1 ... Wire electrode, 2 ... Workpiece, 3 ... Wire guide, 7 ... Machining power supply, 8 ... Power supply, 9 ...
..Processing power supply control devices, 11 ... NC control devices, 1
3 ... Inductance, 100 ... Contact detection circuit,
200 ... Contact state detection device

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-4-82618 (JP, A) JP-A-2-199512 (JP, A) JP-A-50-148995 (JP, A) JP-A-3- 60925 (JP, A) JP-A-8-300225 (JP, A) JP-B-46-13707 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23H 7/04

Claims (5)

(57) [Claims] 1. A machining power source device applies a voltage to a gap formed between a wire electrode and a workpiece to generate an electric discharge, and the wire electrode and the workpiece are moved relative to each other to form the workpiece. in wire electric discharge machining apparatus for machining of objects, independent of the machining power supply apparatus, the machining gap
A contact detection device that has a built-in power supply for supplying a voltage for detecting contact, and that detects the contact between the wire electrode and the workpiece; and the wire electrode using an output signal of the contact detection device. And a contact state detection device that outputs contact state information with the workpiece, a wire electric discharge machine. 2. A machining power source device applies a voltage to a gap formed between the wire electrode and the workpiece to generate an electric discharge, and the wire electrode and the workpiece are moved relative to each other to form the workpiece. in wire electric discharge machining apparatus for machining of objects, independent of the machining power supply apparatus, the machining gap
A contact detection device that has a built-in power supply for supplying a voltage for detecting contact, and that detects the contact between the wire electrode and the workpiece; and the wire electrode using an output signal of the contact detection device. And a contact state detecting device that outputs contact state information between the workpiece and the workpiece, and a gap distance calculating unit that obtains a distance between the wire electrode and the workpiece using the contact state information. Wire EDM equipment. 3. A machining power source device applies a voltage to a gap formed between the wire electrode and the workpiece to generate an electric discharge, and the wire electrode and the workpiece are moved relative to each other to form the workpiece. in wire electric discharge machining apparatus for machining of objects, independent of the machining power supply apparatus, the machining gap
A contact detection device that has a built-in power supply for supplying a voltage for detecting contact, and that detects the contact between the wire electrode and the workpiece; and the wire electrode using an output signal of the contact detection device. And a contact state detection device that outputs contact state information between the work piece and the work piece, and processing feed so that the contact state between the wire electrode and the work piece becomes a predetermined state based on an output signal of the contact state detection device. A wire electric discharge machine comprising: a controller for controlling a speed. 4. The wire electric discharge machine according to claim 1, wherein the contact state information between the wire electrode and the workpiece output by the contact state detecting device indicates the time occupied by the contact state for a predetermined time. A wire electric discharge machine characterized by a ratio. 5. The wire electric discharge machining apparatus according to claim 2, wherein the machining distance calculating means calculates at least one of the plate thickness of the workpiece and the tension of the wire electrode as a parameter. Processing equipment.