JPH0463623A - Control method for discharge machining device - Google Patents

Abstract

PURPOSE:To accelerate the machining refuse removing effect by a jump action by increasing the jump quantity, or shortening the repetition frequency of the jump, or increasing the rest width of a discharge pulse when the difference between machining depths at present and at the previous sampling is smaller than a preset value. CONSTITUTION:When the discharge machining process is started, a sampling action detecting the present electrode position based on the position of a machining electrode 12 at the time of a machining start, for example, is performed by an arithmetic unit CPU, the difference H between the position of the machining electrode 12 at the time of previous sampling and the present position is calculated, and the reference jump quantity, jump repetition frequency, and tauOFF corresponding to the calculated machining depth D are determined from a memory element 21 and set in an electrode feed servo system. The difference H between the present position of the machining electrode 12 and the position at the previous jumping is compared with the preset value in magnitude, if H is negative, the jump quantity is set larger than the reference jump quantity, or the repetition frequency of a jump action is shortened, or the pulse rest width tauOFF of a machining power unit 17 is increased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control method for an electrical discharge machine, and in particular, an electrical discharge machine that performs electrical discharge machining on a workpiece while giving a jump motion to the feed motion of a machining electrode. , detects the gap between the machining electrode and the workpiece and the machining depth of the electric discharge machining applied to the workpiece, and provides appropriate jump conditions commensurate with the detected data to achieve high efficiency electric discharge machining. The present invention relates to a control method for an electrical discharge machine that is improved so that stable electrical discharge machining action can be obtained.

[Prior art]

In a die-sinking electric discharge machine, a discharge pulse current is generated through the discharge gap between the full-form machining electrode and the workpiece, and by scattering machining debris from the workpiece, the discharge is created into the desired shape and dimensions. Perform processing. In such die-sinking electrical discharge machining, if the workpiece is machined in advance to sufficiently reduce the machining allowance for electrical discharge machining and accelerate the machining progress, it is also possible to When machining a hole with a narrowed bottom part, or when performing fine electrical discharge machining where only the fine machining allowance is processed using a full-form machining electrode, the machining electrode and workpiece have traditionally been The inter-electrode state between the electrodes is detected through the measured value of the inter-electrode voltage, and the pulse widths To and I of the discharge pulse current and the pause width τ are determined. , F, etc., and perform electric discharge machining under fixed jump conditions, that is, while applying a jump operation to the machining electrode at a constant repetition cycle and a constant jump amount. This method of controlling processing conditions has already been implemented. In other words, the progress of the electrical discharge machining action is optimized by controlling the current conditions, and the machining electrode sent into the machining hole of the workpiece jumps (jumps) during the progress of electrical discharge machining in the machining fluid. By operating the machine, machining debris is removed by a pumping action, and the proper progress of electrical discharge machining is promoted.

[Problem to be solved by the invention]

However, according to the above-mentioned machining condition control method of conventional electrical discharge machines, the machining electrode performs electrical discharge machining on the workpiece, increasing the machining depth (the technical idea is to adjust the jump conditions by taking the conditions into consideration). Therefore, the removal effect of machining debris may not be sufficiently improved due to insufficient jump amount or repetition period of the jump operation, or conversely, the jump amount may be unnecessarily large or the repetition period of the jump operation may be too short. Therefore, problems such as the machining efficiency of electrical discharge machining actually decreased.

In addition, the control of the machining conditions of the conventional electric discharge machine ultimately attempts to control only the pause width (τOFF) of the discharge pulse current depending on the signal of the state of the gap between the machining electrode and the workpiece. It was not intended to provide detailed control of the conditions for jumping motion.

Therefore, the jump amount and the repetition period of the jump operation are set at a constant jump amount based on the operator's experience, and the jump repetition period is also fixed at a constant period value selected based on empirical rules and incorporated into the electrical discharge machining control program. Save,
Since the setting of jump conditions is highly dependent on the skill level of the operator, there are problems such as not necessarily achieving the results of adding jump motion, and increasing the number of man-hours for program setting, which is uneconomical. It was.

Therefore, an object of the present invention is to improve the method of controlling machining conditions in the conventional electrical discharge machine described above.

[Means to solve the problem]

That is, in controlling the machining conditions during machining action between the machining electrode of the electric discharge machine and the workpiece, the present invention determines, presets and stores an appropriate reference jump amount relationship in relation to the machining depth of the workpiece. Then, set a jump amount that is increased or decreased from the standard jump amount according to the data of the machining depth of the workpiece and the position of the machining electrode, and also adjust the jump repetition period to be increased or decreased from the period when the standard jump amount was set to obtain the current machining depth and machining. A jump motion commensurate with the electrode feed speed data is given to the machining electrode, and at the same time, the current conditions of the discharge pulse current are also controlled.

That is, according to the present invention, the pulse width and pause width of the discharge pulse current are adjusted depending on the gap state between the machining electrode and the workpiece.
In a control method for an electric discharge machine that processes a workpiece by controlling electric discharge machining conditions such as machining electrode jump conditions, the machining depth of the workpiece by the machining electrode is detected at every predetermined sampling time, and the current value of the electric discharge machining electrode is detected. Find the difference in the machining depth of the workpiece between and the previous sampling time, and if the difference in machining depth is smaller than a preset value, increase the jump amount by a predetermined amount and change the jump repetition period to a predetermined value. A control method for an electrical discharge machine is provided, which performs at least one of the following: shortening the pause width of the discharge pulse by a predetermined amount; and increasing the rest width of the discharge pulse by a predetermined amount.

Further, according to the present invention, the electric discharge machining conditions such as the pulse width and pause width of the discharge pulse current and the machining electrode jump conditions are controlled according to the gap state between the machining electrode and the workpiece, and the electric discharge machining process is performed to machine the workpiece. In a control method for a processing machine, a jump amount, a jump repetition period, and a pause width of a discharge pulse are set and stored in advance according to the processing depth of the workpiece, and the processing depth of the workpiece by the processing electrode is detected at each sampling time. Then, find the difference in the machining depth of the workpiece between the current electric discharge machining electrode and the previous sampling time, and if the difference in machining depth is within a preset range, the detected machining depth of the workpiece is the corresponding preset;
A method of controlling an electric discharge machine is provided in which stored values of a jump amount, a jump repetition period, and a pause width of a discharge pulse are used as machining conditions.

Further, according to the present invention, the electrical discharge machining conditions such as the pulse width of the discharge pulse current, the pause width, and the machining electrode jump conditions are controlled according to the gap state between the machining electrode and the workpiece, and the discharge machining conditions for machining the workpiece are controlled. In a method for controlling a processing machine, the machining depth of the workpiece by the machining electrode is detected at every predetermined sampling time, the difference in the machining depth of the workpiece between the current time of the electric discharge machining electrode and the previous sampling time is determined, and the machining is carried out. When the difference in depth is larger than a predetermined value, at least one of reducing the predetermined jump amount by a predetermined amount, increasing the jump repetition period by a predetermined amount, and decreasing the pause width of the discharge pulse by a predetermined amount. A method for controlling an electric discharge machine is provided, in which one control is executed.

[Effect]

According to the above-described configuration, an appropriate jump motion is applied to the machining electrode according to whether the progress state of electric discharge machining is stable or unstable, and it is possible to improve machining efficiency and promote stabilization of the electric discharge machining action.

Hereinafter, the present invention will be described in more detail according to embodiments shown in the accompanying drawings.

[Example] Fig. 1 is a block diagram showing the configuration of a die sinking electric discharge machine to which the processing condition control method according to the present invention is applied, and Fig. 2 is a flowchart explaining the operation of the processing condition control method according to the present invention. Figure 3 is a graph showing the relationship between the standard jump amount and machining depth, with the workpiece machining depth on the horizontal axis and the jump amount on the vertical axis, and the jump amount against the machining depth actually applied by machining control. Figure 4 shows depth of 20ml11
FIG. 3 is a graph diagram showing the relationship between the machining depth and the required machining time per unit depth when the above-mentioned relatively deep hole is electrically discharge-machined.

First, referring to FIG. 1, a die sinking electric discharge machine to which the present invention is applied has a machining tank 11 in which machining fluid is stored in a machine body 10, and a workpiece is placed in the machining tank 11. A full-form machining electrode 1 to which a workpiece W is attached and fed from above
2, electrical discharge machining is performed. The processing electrode 12 is gripped by a chuck device 16 attached via an insulating member 15 to the lower end of the main shaft 14, which is fed by a drive motor M via a feed device f13 having a feed screw mechanism. Direct the workpiece W according to the vertical movement (
It is fed in the direction (positive direction) and in the direction of retreating from the workpiece W (negative direction), and faces the workpiece W through a discharge gap, as is well known.

The machining electrode machine 2 and the workpiece W are connected to the machining power ji! via a power supply cable. It is connected to the device 17, and therefore, during electrical discharge machining, electric discharge is generated in the machining gap by the machining electric pulse (pulse width τ.6. Pulse pause width τ.FF) supplied from the machining power supply 17. ing. During electrical discharge machining, the voltage between the machining electrodes 12 and the work W in the electrical discharge machining section is constantly monitored and detected by the voltage detection means 18, and the detected data is sent to the control device 2 of the electrical discharge machine.
Sent to 0.

The control device 20 includes a calculation device CPU, a memory device 2 forming a storage means, an interface 22, machining information including electric discharge machining data of various workpieces, and reference jump amount data corresponding to the machining depth of the workpiece. It is configured to include an operation panel 23, a display device 24, etc. for inputting information such as the following. Therefore, the data detected by the above-mentioned electrode-to-electrode voltage detection means 18 is manually inputted to the arithmetic unit CPU via the interface 22. Further, the control device 20 is connected to the rotation detector E of the drive motor M1 of the feed system of the main shaft 14 via the interface 22, and constitutes a servo system that controls the feed operation of the main shaft 14. The feed amount of the processing electrode 12 is controlled through the feed operation of the main shaft 14. That is, the feed amount of the machining electrode 12 is controlled in both positive and negative directions according to the detected data of the machining gap state in the electric discharge machining section.

The control device 20 is further connected to the machining power supply device 17 via an interface 22, and controls the current conditions of the discharge pulse current, the distortion, and the Hals radius τ according to the machining gap state of the discharge machining section. 8. Pulse pause width τ. It is configured to send out a control signal for controlling the FF.

Now, according to the present invention, while the machining electrode 12 is performing electrical discharge machining on the workpiece W, when the machining gap state between the machining electrode and the workpiece is detected by the machining voltage detection means 18, According to this detection data, the arithmetic unit CPU of the control device 20 can calculate the amount of feed operation applied to the processing electrode 12 from time to time via the feed servo system using the drive motor M as the drive source, and performs operation. By calculating the total feed amount of the machining electrode 12 from the starting point of the electric discharge machining performed according to the electric discharge machining information regarding the corresponding workpiece W input from the panel 23, the machining electrode 12 is currently
It is possible to calculate and inspect the position moved from the position at the start of electrical discharge machining. Furthermore, by integrating the total feed amount of 9 positive and negative feed operations given to the machining electrode 12 via the feed servo system, data on how deep the electric discharge machining has been performed on the workpiece W can also be calculated. . Further, the position and machining depth of the machining electrode 12 may be determined using a digital scale (not shown) that detects the feed movement amount of the machining electrode 12 in real time.

The processing condition control method according to the present invention is performed based on the above-mentioned prerequisite operating conditions.

Now, when electric discharge machining of the workpiece W by the machining electrode 12 is started, electric discharge is generated in the electric discharge machining section where the electrode and the workpiece face each other across the machining gap due to the discharge pulse voltage applied from the machining power supply device 17, and the workpiece W electrical discharge machining progresses. At this time, the control device 20
The gap condition in the electrical discharge machining section is detected from the gap voltage data detected by the machine. And according to this state of extremes,
Adjust machining conditions and perform control to maintain normal electrical discharge machining conditions. On the other hand, as the machining of the workpiece W progresses, a jump motion is applied to the machining electrode 12 via the feed servo system in order to remove machining debris accumulated in the machining recess of the workpiece W. This jump operation is set based on the jump amount (jump amount) and the length of the jump repetition cycle, and when the machining electrode 12 jumps in the machining fluid in the machining tank 11, a pump action is activated, and the workpiece W is This removes the machining debris accumulated in the machining recess and promotes normal electrical discharge machining. The present invention aims to adjust the jump conditions to suit the progress of electrical discharge machining so that the progress of electrical discharge machining can be further optimized.

Therefore, according to the present invention, the workpiece W is subjected to electric discharge machining in advance to increase the machining depth (machining depth (mm
) is experimentally determined and set and stored in the control device 20 in advance. In other words, as the machining depth increases, it is necessary to gradually increase the jump amount in order to obtain the pumping effect of the jump operation, and such jump amount is experimentally determined in advance as data.
As shown by the dotted line in FIG. 3, a graph of machining depth (horizontal axis) versus jump amount (vertical axis) is set from the operation panel 23 in the memory element 21 of the control device 20. Then, during the electrical discharge machining process, the machining depth is detected and the jump amount is adjusted.

Now, the present invention calculates and detects the position of the machining electrode 12 at every sampling time from the start of electrical discharge machining, and also calculates and detects the machining depth of the work W at the detection time and sets the position of the machining electrode 12 at each sampling time. The jump conditions are set through the feed operation of the feed servo system, and the jump motion is applied. Moreover, the machining conditions of the machining power supply device 17, for example, the pulse pause width τOFF, are also set in accordance with the jump condition settings.

The flowchart in FIG. 2 explains the jump condition setting operation according to the present invention.

First, determine the appropriate standard jump amount, jump repetition period, and τ according to the machining depth of the workpiece. Machining conditions such as F2 are stored in advance in the memory element 21, and the electrical discharge machining process on the workpiece W is started by the machining electrode 12 of the electrical discharge machine. In the arithmetic unit CPU of the control device 20, a sampling operation is performed to detect the current electrode position based on the position of the machining electrode 12 at the time of starting machining, for example, according to a pre-programmed sampling period (step 2). According to this sampling operation, the electrode position to be opened at the same sampling time is calculated by calculating the total cumulative amount of positive and negative electrode feed amounts performed from the position at the start of electrical discharge machining to the sampling time. The position is detected as the current position.

Next, the difference ΔH between the position of the processing electrode 12 and the position of the processing electrode 12 at the previous sampling time is calculated (step 2).

Next, the machining depth D of the workpiece W subjected to electrical discharge machining by the same sampling time is calculated I (step ■). This machining depth D can be easily determined by knowing the current electrode position, since the workpiece W has been subjected to electrical discharge machining by a distance corresponding to the total distance from the electrode position at the start of machining to the current electrode position. The arithmetic unit CPU is capable of calculation and detection.

Next, the settlement device CPU calculates the reference jump amount, jump repetition period, and τ corresponding to the machining depth D thus calculated. 21, etc. are determined from the relationships previously stored in the memory element 21, and set in the electrode feeding servo system having the drive motor M (step 2). In this way, at each sampling time, the reference jump amount, the repetition period of the jump operation, and τ corresponding to the machining depth at that time are determined. p
p etc. should be set.

At the same time as setting the reference jump amount, the difference ΔH between the current position of the processing electrode 12 obtained in step (3) and the position at the previous sampling time is compared in magnitude with a predetermined value.

In this embodiment, this predetermined value is set to 0, so that a positive/negative determination is performed (step 2). In other words, ΔH is a positive value, that is, the machining electrode 12 is moving in the direction of progress of machining from the previous sampling time, or it is a negative value, that is, the machining electrode 12 is moving in the backward direction of machining from the previous sampling time. 12 is moving.

When ΔH is negative, it means that the machining electrode 12 has been moved in the direction opposite to the machining progress from the time of the previous sampling, that is, the machining state in the electrical discharge machining section is unstable. In this case, in order to promote the removal of machining debris, the jump amount is set to a value larger than the previously set standard jump amount, and the repetition period of the jump action is also set. is shortened to cause the machining electrode 12 to frequently perform jump operations with a large jump amount to promote the pumping action (step (2)). At this time, the control device 20
In this case, the machining conditions of the machining power supply device 17 are also adjusted to obtain the pulse pause width τ. , p are increased to restore stabilization of machining in the electrical discharge machining section. Note that this increase in jump amount, shortening of the jump repetition period, and τ. By executing at least one of the controls for increasing F, it is possible to restore the stability of processing.

On the other hand, if the determination result in step (2) above is zero or positive, sampling is continued with the conditions of the reference jump amount and appropriate repetition period of the jump operation set, and the predetermined number of samplings (m times) is continued. It is determined whether or not the difference ΔH between the positions of the processing electrodes 12 calculated up to this point is continuously larger than the preselected threshold data a (step 2). The number of sampling times m and the threshold value a of the difference between the electrode positions are determined experimentally in advance and set in the memory element 21 of the control device 20, so that the arithmetic unit CPU performs the above-described discrimination operation according to these setting conditions. do.

From the determination result, if the difference in the position of the machining electrode 12 does not continuously exceed the threshold value a for a predetermined number of times m, stable electric discharge machining action is being continued in the electric discharge machining section. It is determined that an unstable machining state may occur, and the jump condition and the machining condition of the machining power supply device 17 are set to, for example, condition A (step (2)). - This condition A is, for example, to slightly shorten the jump repetition period while maintaining the reference jump amount, and to set the pulse current pulse pause width τ. , p is set to a somewhat large value.

On the other hand, from the determination result in the above step
If a larger condition is achieved, the electric discharge machining section determines that the electric discharge machining operation is stable and continues normal machining operation, and furthermore, Then, it is determined whether or not the difference ΔH between the positions of the processing electrodes 12 is larger than a threshold value a which is larger than the threshold value a between the front and rear positions (step 2). In other words, the stability of electrical discharge machining in the electrical discharge machining section is determined under more stringent conditions.

From this discrimination effect, when a negative result is obtained, it is determined that the stability of machining in the electrical discharge machining section is much better than that in step ■, but not the best, and the jump set in step ■ is determined. The jump conditions and the pulse pause width τ of the pulse current are such that the period is shortened by an appropriate amount from the repetition period of the operation. , set condition B consisting of processing conditions that shorten F from step ■ and end (Stella 1pu @).

Furthermore, if it is determined that the above discrimination result is greater than the threshold value -su for n times, it can be determined that extremely stable electric discharge machining is continuing in the electric discharge machining section, so the jump operation is not repeated. The period is further shortened to increase the pause width τ of the pulse current. Condition C is set to further shorten pp as well, and the process ends (step O).

By repeating the above jump condition setting action during the electrical discharge machining process and controlling the feed operation of the machining electrode 12 and the current conditions of the discharge pulse current generated between the electrode and the workpiece, electrical discharge machining can be kept in a stable state at all times. We will try to maintain it.

In addition, the solid line in FIG. 3 shows an example of the jump amount actually set during the process of electrical discharge machining.

Although not shown here, a graph of the relationship between the appropriate jump repetition period and τOFF corresponding to the machining depth D is also obtained in advance.

As a result of comparing the electrical discharge machining effect to which the machining condition control method according to the invention described above is applied with that to which the conventional machining condition control method is applied, it was confirmed that the following excellent effects were exhibited.

[Example 1] Workpiece W has a diameter of 2 without having been drilled in advance.
Electric discharge machining was performed to a depth of 0 mm and a depth of 10 mm using the same electric discharge machining electrode 12 under the same discharge pulse current conditions.

In the conventional machining condition control method, the jump amount was set to 7 mm.
, jump repetition period 0.4 seconds, jump speed 4
When set to 00mm/min, the machining time is from depth 0 to 5.
It took 67 minutes between mm and 69 minutes between 5 and 10 mm, and a total of 136 minutes.

However, as a machining condition control method of the present invention, jump conditions are set by applying the relationship between machining depth and jump amount shown in Fig. 3, and as a result, machining time from 0 to 5 mm depth is 35 mm. The processing time from 5 to 10 mm was 63 minutes, reducing the total time to 98 minutes. In other words, according to the present invention, there is no case where the machining electrode 12 is subjected to a negative feed operation during the electric discharge machining process, that is, there is no case where the machining electrode 12 is forced to move backward in order to maintain the stability of machining in the electric discharge machining section. The result is that processing progresses quickly.

[Example 2] The work W is machined in advance by machining a cylindrical hole up to a diameter of 17.8 mm and a length of 10 mm, and a tapered conical hole up to a depth of 15 mm afterwards, and a full-sized machining electrode 12 ( A comparison was made between applying the present invention and applying a conventional machining condition control method to a machining process in which electrical discharge machining is performed using a steel plate (diameter 18 mm) under the same discharge pulse current. .

At this time, in the conventional method, jump conditions were selected and performed in two ways as described below, and each was compared with the present invention.
■ ■(Conventional) Jump amount 1.
4mm2.2mm Jump repetition period 0.5 seconds, 0. '5 seconds Jump speed 400 mm/miw 400 am/IIlin In the present invention, the relationship between the machining depth D and the jump amount shown in FIG. 3 is applied.

As a result, for depths of 0 to 5 mm, the machining times under the conditions of ■ and ■ above are 6 minutes and 7 minutes, respectively, according to the conventional method.
However, in the present invention, it took only 3 minutes.

In addition, for a machining depth of 5 to 10 mm, the conventional method took 11 minutes and 10 minutes under conditions (1) and (2), respectively, but the present invention was able to shorten the time to 6 minutes.

Furthermore, for machining depths of 10 to 15 mm, conventional methods require 120 minutes and 65 minutes under conditions (1) and (2), respectively, but according to the present invention,
It was 65 minutes. In other words, the total machining time from 0 to 15 mm in total depth is as follows:
It was confirmed that it can be significantly reduced.

Example C 3] Furthermore, in the case of electrical discharge machining a deep hole with a depth of 20 mm or more in a workpiece W, a comparison was made between applying the conventional machining condition control method and the method of controlling machining conditions of the present invention.

The size of the hole to be machined for the workpiece W was 7 mm square hole.

FIG. 4 is a graph showing this result, in which the horizontal axis represents the machining depth and the vertical axis represents the machining time required for each 1 mm depth machining.

In the conventional method, the jump amount is set to a constant value of 1.4 mm, but in the present invention, control is performed according to the relationship between the machining depth and the jump amount as shown in FIG.

From Fig. 4, it is confirmed that when the machining condition control method according to the present invention is applied, the electric discharge machining time is averaged to be approximately constant for each 1 mm depth machining until the depth reaches 35 mm. It was done. On the other hand, when the conventional method was applied, it was confirmed that the time required for each 1 mm increases rapidly from the time when the depth exceeds 20 mm.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in an electric discharge machine that performs electric discharge machining of a recess on a workpiece using a full-form machining electrode, the machining depth of the workpiece increases as the electric discharge machining progresses. In the process, the machining conditions are controlled to appropriately adjust and control the jump amount, jump repetition period, and pause width of the discharge pulse current for the machining electrode, so that the machining debris removal effect due to the machining electrode's jump operation is improved. Acceleration can be achieved. As a result, the machining gap condition in the electrical discharge machining section is constantly optimized and the electrical discharge machining process is continuously stabilized, which significantly improves the machining efficiency when machining a recess on a workpiece by electrical discharge machining. It can be improved.

In other words, in machining with a small electrical discharge machining allowance in which a pilot hole has been previously machined on the workpiece, it is possible to double the machining efficiency compared to conventional methods, and the electrical discharge machining effect in small diameter hole machining and deep hole machining can also be improved. This made it relatively easy to process.

4th graph showing the relationship between the standard jump amount and machining depth, with the machining depth on the horizontal axis and the jump amount on the vertical axis, and the jump amount with respect to the machining depth actually applied by machining control! ! 1 is a graph showing the relationship between machining depth and required machining time when a relatively deep hole with a depth of 20 mm or more is electrically discharged.

DESCRIPTION OF SYMBOLS 11... Processing tank, 12... Processing electrode, 13... Feed screw device, 14... Main shaft, 17... Processing power supply device, 18... Voltage detection means between electrodes, 20... Control device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a die-sinking electric discharge machine to which the method of controlling machining conditions according to the present invention is applied, FIG. 2 is a flowchart explaining the operation of the method of controlling machining conditions according to the present invention, and FIG. Workpiece machining depth D (mm) Fig. 3

Claims (1)

[Claims] 1. Electric discharge that processes a workpiece by controlling electric discharge machining conditions such as the pulse width and pause width of a discharge pulse current and machining electrode jump conditions according to the gap between the machining electrode and the workpiece. In a method for controlling a machining machine, the machining depth of a workpiece by the machining electrode is detected at every predetermined sampling time, the difference in the machining depth of the workpiece between the current time of the electric discharge machining electrode and the previous sampling time is determined, and the machining is performed. When the difference in depth is smaller than a predetermined value, at least one of increasing the jump amount given in advance by a predetermined amount, shortening the jump repetition period by a predetermined amount, and increasing the pause width of the discharge pulse by a predetermined amount. A control method for an electrical discharge machine, characterized in that one control is executed. 2. In a control method for an electric discharge machine that processes a workpiece by controlling electric discharge machining conditions such as the pulse width and pause width of the electric discharge pulse current and the machining electrode jump conditions according to the gap between the machining electrode and the workpiece. , presetting and storing a jump amount, a jump repetition period, and a pause width of the discharge pulse according to the machining depth of the workpiece; detecting the machining depth of the workpiece by the machining electrode at each sampling time; Find the difference in the machining depth of the workpiece between the current time and the previous sampling time, and if the difference in machining depth is within a preset range, the preset value corresponding to the detected machining depth of the workpiece,
A control method for an electric discharge machine, characterized in that each of the stored values of a jump amount, a jump repetition period, and a pause width of an electric discharge pulse is used as a machining condition. 3. In a control method for an electric discharge machine that processes a workpiece by controlling electric discharge machining conditions such as the pulse width and pause width of the electric discharge pulse current and the machining electrode jump conditions according to the gap between the machining electrode and the workpiece. , detecting the machining depth of the workpiece by the machining electrode at every predetermined sampling time, determining the difference in the machining depth of the workpiece between the current time of the electric discharge machining electrode and the previous sampling time, and determining the machining depth difference in advance. When it is larger than the predetermined value, at least one of the following controls is executed: reducing the jump amount given in advance by a predetermined amount, increasing the jump repetition period by a predetermined amount, and decreasing the pause width of the discharge pulse by a predetermined amount. A control method for an electric discharge machine, characterized in that: 4. In a control method for an electric discharge machine that processes a workpiece by controlling electric discharge machining conditions such as the pulse width and pause width of the electric discharge pulse current and the machining electrode jump conditions according to the gap between the machining electrode and the workpiece. , preset and store the jump amount, jump repetition period, and discharge pulse pause width according to the machining depth of the workpiece, and integrate the feed amount of the machining electrode from the start of the discharge machining to each sampling time. Detecting the current position of the machining electrode for each sampling, calculating the difference between the current position of the machining electrode and the position of the machining electrode at the previous sampling time, and calculating the calculated position difference of the electric discharge machining electrode in the past. The machining depth of the workpiece at the current sampling time is detected by accumulating and calculating the total sampling time, and the previously set, stored jump amount, jump repetition period, and discharge pulse corresponding to the detected machining depth of the workpiece are Outputs the pause width of the current, increases the jump amount by a predetermined amount when the value of the position difference between the current processing electrode and the previous sampling time is smaller than a predetermined value, and increases the jump repetition period by a predetermined amount. executing at least one control of shortening the pause width of the discharge pulse current and increasing the pause width of the discharge pulse current by a predetermined amount, and when the value of the position difference between the current position of the processing electrode and the previous sampling time is larger than the preset predetermined value; , thereafter, at least each time a plurality of predetermined samplings are performed, it is determined whether the difference value between the current position of the processing electrode and the position at the time of the previous sampling is continuously a positive value larger than a predetermined threshold; If the determination result is negative, the settings, the stored jump amount, the jump repetition period, and the pause width of the discharge pulse are retained, and if the determination result is a positive value that is continuously larger than the threshold value, , an electric discharge machine that executes at least one of the following controls: reducing the jump amount by a predetermined amount, increasing the jump repetition period by a predetermined amount, and decreasing the pause width of the discharge pulse current by a predetermined amount. control method.