JP2002224917A - Control device for electrical discharge machining - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for electrical discharge machining, which can prevent a collision between a main shaft and a workpiece even if a misoperation is performed during the performance of a manual operation when an automatic operation under numerical control in electrical discharge machining is put in a state of a temporary halt, completion of machining or the like. SOLUTION: In the control device for the electrical discharge machining, the manual operation for making the main shaft and the workpiece face each other for an approach is restricted when the automatic operation is put in the state of the temporary halt or the like. When a facing-approach action by the manual operation is desired, the facing-approach action cannot be performed unless an acknowledge button is pushed coincidentally or unless the main shaft is located separate from the workpiece with respect to a position of the main shaft at the start of the machining.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In an electric discharge machine equipped with a numerical control device, an electric discharge machine which limits a part of an axis feed command by manual operation when automatic operation by numerical control of electric discharge machining is temporarily stopped or interrupted. Related to a control device for a vehicle.

[0002]

2. Description of the Related Art Conventionally, in a wire electric discharge machine or a die sinking electric discharge machine equipped with a numerical controller,
The electric discharge machine can be automatically operated according to the machining program input to the control device for the electric discharge machine including the numerical control device, but the numerical control device further has,
Alternatively, automatic operation can be temporarily stopped or the like in response to a command from an operator. Further, a manual operation device is provided so that a manual operation can be performed when the vehicle is temporarily stopped. This is due to the control technology, for example, when the wire electrode is cut and caught in the machining groove, when the remaining wire electrode is exhausted, or when you notice an error in the machining program after starting automatic operation. Although it has advanced, it is a function provided because it is not perfect.

[0003] However, during the electric discharge machining by numerical control, the electric discharge machining is temporarily stopped or the like, and when it is attempted to temporarily retreat the main spindle by manual operation to a position where it does not hinder any work of the operator, the spindle is often turned off. In some cases, the workpiece may be lowered by trying to raise it, causing the die-sinking electrode or the nozzle block to collide with the workpiece to be damaged.

[0004] By the mass m of the entire processing head and the total acceleration a consisting of acceleration for acceleration / deceleration during the Z-axis movement and gravitational acceleration acting because the Z-axis movement is movement in the direction of gravity, F = ma inertial force F acts on the main shaft.

[0005] Then, in order to terminate any manual operation that the operator has performed by temporarily stopping the electric discharge machining and restarting the electric discharge machining by numerical control, the temporarily retracted spindle is manually moved to the machining interruption position by manual operation. When moving, if the movement is a downward movement from the proximity position, the Z-axis cannot be stopped immediately due to the inertial force.
In some cases, the spindle and the workpiece collided.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and performs a manual operation when the automatic operation by numerical control of electric discharge machining is temporarily stopped. In this case, there is provided an electric discharge machine equipped with a machining control device for restricting a manual operation for relatively bringing the main spindle and the workpiece relatively close so that the main spindle does not accidentally collide with the workpiece.

In order to perform the relative approach operation by the manual operation, it is necessary to hold down the confirmation button, or from the state where the main spindle position is more separated from the workpiece than the main spindle position at the start of machining. Otherwise, the present invention provides an electric discharge machine equipped with an electric discharge machining control device in which relative approach movement cannot be performed.

[0008]

A first feature of the present invention for solving the above-mentioned problems is a machining control device of an electric discharge machine which performs machining under numerical control according to a machining program prepared in advance. A position detection means for detecting a spindle position, a storage means for storing a spindle position at the start of processing detected by the position detection means, and a processing stop after the start of processing,
Determination means for determining whether the processing can be resumed or temporarily stopped, or the other processing is interrupted, stopped, or completed.
The command stop means for restricting the execution of the work proximity movement command of the main spindle during the input movement command of the pause release processing when the processing stop is the above-mentioned pause, and the re-execution is commanded by the pause release processing When restarting the numerically controlled electric discharge machining of the program, the Z-axis main spindle is once returned to the detection storage main spindle position at the start of the machining, and then the return movement control means for controlling to resume, and the machining stop is performed as described above. This is characterized in that machining stop processing means for terminating the numerically controlled electric discharge machining when the stop is other than the temporary stop is provided.

A second feature of the present invention is that in a machining control device for an electric discharge machine which performs machining under numerical control according to a machining program prepared in advance, position detecting means for detecting a spindle position, Storage means for storing the spindle position at the start of machining detected by the position detection means, and machining stop after the start of the machining, a temporary stop capable of continuing to resume machining,
A determination means for determining whether the other processing is interrupted, stopped, or ended, and execution of a work proximity movement command of the main spindle during the input movement command of the pause release processing when the processing stop is the above-mentioned pause. Command restricting means, and when re-executing a command by the temporary stop release processing to restart the numerically controlled electric discharge machining of the program, the Z-axis main spindle is once returned to the detection storage main spindle position at the start of the machining. rear,
Return movement control means for controlling to resume, and limiting the execution of the work proximity movement command of the main spindle in the input movement command of the end processing operation when the machining stop is a stop other than the temporary stop, A second command restricting means which may be the same command restricting means as the command restricting means, and a machining end processing means for terminating the numerical control electric discharge machining by inputting the end processing operation which is not restricted by the command restricting means. On the point.

A third feature of the present invention is that the command restricting means restricts input of a work proximity movement command of the spindle and then operates a confirmation button, and when the machining is started, the spindle position is shifted from the spindle position at the start of machining. The present invention is characterized in that the command restricting means validates the proximity movement command input when the position is at a position separated from the workpiece and / or when the position is both.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 are front views schematically showing the periphery of a machining head main spindle of a discharge machining apparatus and the periphery of a workpiece including a machining table. FIGS. Die-sinker EDM.

The wire electric discharge machine 1 includes a wire electrode 4
In addition, the die sinking electric discharge machine 2 is a device for subjecting the workpiece 3 to a predetermined machining shape by the die sinking electrode 5.

As shown in FIGS. 1 and 2, the electric discharge machines 1 and 2 respectively include a table 6, an X-axis driving device 7, an X-axis position detecting means 8, a Y-axis driving device 9, and a Y-axis position detecting device. Means 10
A main shaft 11, a Z-axis driving device 12 for the main shaft 11, and a Z-axis position detecting means 13.

The wire-cut electric discharge machine 1 also includes an upper nozzle device 15 having a main shaft 11 having a wire electrode energizing means and a wire guide 14 built therein. The upper nozzle device 15 is supported by an arm (not shown) and sandwiches a workpiece. Lower nozzle device 16 having a built-in wire guide at a position facing nozzle device 15
Is provided.

Further, the die sinking electric discharge machine 2 has an electrode mounting means 17 on the main shaft 11.

FIG. 3 is a block diagram of the electric discharge machine according to the embodiment of the present invention.

In the figure, the electric discharge machine will be described by using a wire cut electric discharge machine 1, but the same applies to a die sinking electric discharge machine 2.

Reference numeral 30 denotes an input / output device. The input / output device 30 includes a manual input device 31 for giving an operator a command to the electric discharge machine, and an external storage device 32 for inputting / outputting data from outside.

The manual input device 31 is a keyboard 3
1a, a mouse 31b, a confirmation button 31c, a pause button 31d, an emergency processing interrupt or stop button 31e, a movement command button 31f, a manual movement command speed setting button 31g,
There is a re-execute button 31h and the like.

The external storage device 32 is a removable medium such as an FD or a CD, a communication device such as a LAN or a modem, etc., and is connected to a personal computer other than the electric discharge machine used, an office away from a factory, and the like. , For transferring data.

The confirmation button 31c is a button used when the operator gives permission or confirmation to the control device.

The pause button 31d is a button which is used by the operator to temporarily stop the electric discharge machining currently in progress for some reason, such as detection and monitoring of the machining section, after starting the electric discharge machining. .

After the electric discharge machining is started, the emergency machining interrupt or stop button 31e is, for some reason, for example,
This button is used when the operator ends the electric discharge machining in the middle, for example, when the operator notices a defect in the machining program after starting the electric discharge machining.

The movement command button 31f is a button used when the operator wants to move each drive shaft of the electric discharge machine arbitrarily. The movement command button 31f includes a button 31fX + for the X-axis + direction, a button 31fX- for the X-axis-direction,
Y axis + direction button 31 Y +, Y axis-direction button 31
fY-, a button 31fZ + in the Z-axis + direction, a button 31fZ- in the Z-axis-direction, and the like.

The manual movement command speed setting button 31g is a button for setting the moving speed of the axis stepwise when the axis is moved using the movement command button 31f. The manual movement command speed setting button 31g includes a slow speed button 31.
g1, a medium speed button 31g2, a fast speed button 31g3, and the like.

The re-execution command button 31h is a button used when re-executing the electric discharge machining temporarily stopped by the pause button 31d, abnormality detection, machining program or the like.

The electric discharge machine control device 40 is a device for controlling the electric discharge machine. The numerical control device 41, the machining program analyzing means 42, the storage means 43, and the command limiting means 4
4, a return movement control means 45, a determination means 46, a processing end processing means 47 and the like.

The numerical control device 41 is a device for actually performing the control function of the electric discharge machine control device 40. According to the machining programs and commands received from the manual input device 31 and the external input device 32, Z, X , Y-axis controller 5
1, 52, 53 and the discharge power supply 54 are commanded to control the electric discharge machine.

The machining program analyzing means 42 is a means for reading the machining program received from the manual input device 31 or the external storage device 32 and analyzing the machining program to be executed.

The storage means 43 stores the manual input device 31
Means for storing various data such as machining conditions and machining programs received from the external storage device 32, and position data detected by the position detecting means 8, 10, and 13 of each axis, and outputting the stored contents as necessary. It is.

When the numerically controlled electric discharge machining in progress is in a specific machining stop state, the command restricting means 44 is a button 31fZ in the negative direction of the Z axis among the movement command buttons 31f.
This is a means for restricting the input of-. Workpiece 3 of spindle 11
By restricting the proximity movement command to, even if the button 31fZ- in the-direction of the Z axis is erroneously pressed during manual operation, the input is limited, so that the nozzle 15 or the engraved electrode 5 is processed. There is no collision with the object 3. Although only one command restricting means 44 may be used,
A plurality may be provided according to a processing stop state such as interruption.

The return movement control means 45 allows the operator to remove the cause of the suspension after the electric discharge machining is temporarily stopped, for example, when the pause button 31d is input or when an abnormality of the electric discharge machine is detected. When electric discharge machining may be resumed by the operator, by means of the operator's input operation of the re-execute button 31h, the main spindle is returned to the storage position at the start of machining and automatic control for resuming the suspended electric discharge machining is performed. is there.

The discriminating means 46 includes a control unit 40 for electric discharge machining.
If the machining is stopped for some reason after the start of EDM by, the machining stop is the above-mentioned temporary stop, which allows the resumption of machining, or the interruption, stop, or end of machining other than the pause It is a means to determine what is.

The machining end processing means 47 is a means for stopping the pump operation and the like and terminating the power supply to end the electric discharge machining when ending the electric discharge machining.

The Z-axis control device 51 is a Z-axis position detecting device 1
3 in accordance with the movement position command output by the electric discharge machining control device 40 receiving the feedback of the detection position signal from
This is a device for controlling the Z-axis movement of the main shaft 11 by the shaft driving device 12.

The X-axis control device 52 includes an X-axis position detection device 8
This is a device for controlling the X-axis movement of the table 6 by the X-axis driving device 7 in accordance with the movement position command output by the electric discharge machining control device 40 receiving the feedback of the detected position signal from the controller.

The Y-axis control device 53 is a Y-axis position detecting device 1
In accordance with the movement position command output by the electric discharge machining control device 40 receiving the feedback of the detection position signal from 0, Y
This is a device for controlling the Y-axis movement of the table 6 by the shaft driving device 9.

The electric discharge power supply 54 is a device for supplying electric energy for electric discharge machining to the electrodes 4 and 5 and the workpiece 3.

The abnormality detecting means 55 monitors the discharge state of the machining gap and the state of each part of the electric discharge machine, and detects any abnormality, for example, abnormal discharge of the machining gap, disconnection of the wire electrode, and the like. To the electric discharge machining control device 40. Upon receiving the abnormality detection signal, the electric discharge machining control device 40 suspends the electric discharge machining and displays a warning on the display device 56 to notify the abnormality,
Warn by alarm, lamp or other warning means.

The display device 56 is a device for displaying various information.

Next, the operation of the electric discharge machine according to the embodiment of the present invention will be described.

FIGS. 4 and 5 are flowcharts of the electric discharge machine according to the first embodiment of the present invention. The flow chart will be described first.
When the electric discharge machine starts operation at 100), the process proceeds to S200.

In S200, after the machining program and machining conditions are input from the input / output device 30 to the storage means 43,
The program is input to the machining program analysis means 42, the machining program and the like are analyzed, and the process proceeds to S300.

In step S300, the main spindle position at the start of electric discharge machining is detected by the Z-axis position detecting device 13 and then stored in the storage means 43.

In S400, the electric discharge machining control device 4
Electric discharge machining numerically controlled by 0 is started, and the process proceeds to S500.

In S500, after the electric discharge machining is started in S400, the electric discharge machining is interrupted by the pause button 31d, the electric discharge machining is interrupted by the emergency machining interrupt or the stop button 31e, and the abnormality detecting means is always or every predetermined sampling time. It is determined whether or not there is a stop request, such as a temporary stop due to the detection of an abnormality at 55 and a temporary stop or processing end by the processing program input in S200. If there is a stop request, the process proceeds to S600, and if there is no stop request, electric discharge machining is continued and S500 is repeated.

In S600, since it is determined that a stop request has been made in S500, the electric discharge machining control device 40 stops the electric discharge machining operation being executed, and proceeds to S700.

In step S700, the stop request determined in step S500 by the determination means 46 is a temporary stop in which processing can be resumed by a manual processing operation or the like, or a processing interruption in which processing cannot be continued in principle. , Stop, or end of processing, etc. If the stop request is other than the temporary stop, the process proceeds to S1200. If the stop request is a temporary stop, the temporary stop release process is started, and the process proceeds to S800, where the operator performs an operation for removing the cause of the temporary stop. However,
Even in the case of the above-mentioned processing end or interruption, depending on the case or the processing operation, it is needless to say that the processing may be switched to the temporary stop in which the processing can be resumed.

In step S800, a manual operation performed by the operator to remove the cause of the temporary stop is
The command input restricting means 44 imposes restrictions. FIG. 5 shows a flowchart of the command input restriction process.

In S810, it is determined whether or not a manual operation command for canceling the suspension of machining has been input. If it is determined that no manual operation has been performed, the process proceeds to S8.
Returning to S10, if it is determined that a manual operation has been performed, the process proceeds to S820.

In S820, the manual operation determined to have been S810 is the button 31fZ in the Z-axis direction.
It is determined whether the input operation is a negative one or includes the instruction. If it is determined that the input operation is a button input in the Z-axis direction, the process returns to step S810 to request re-input of a command or the like. However, if it is not a button input operation in the Z-axis direction, the process proceeds to S830.

In S830, it is determined whether or not the manual operation is to be temporarily released by the input operation of the re-execute button 31h. If not, the operation according to the manual operation is performed, and the process returns to S810.

By doing so, the input of the button 31fZ- in the-direction of the Z axis in the manual operation is invalidated. If it is determined in S700 that the operation has been suspended, the worker performs an operation to remove the cause of the suspension. At that time, the nozzle 15 or the engraving electrode 5 approaching the workpiece 3 in a unit of several mm to several μm may obstruct the work. For this reason, the button 31fZ + in the + direction of the Z axis is operated in order to separate the spindle 11 from the workpiece 3 by manual operation. At this time, even if the button 31fZ− is operated by mistake instead of the button 31fZ +, the button input in the − direction of the Z axis is invalidated, and the Z axis does not move in the − direction. The engraving electrode 5 does not collide with the workpiece 3.

If it is determined in S830 that the manual operation is a temporary stop release operation, the return movement control means 45 starts preparations for continuing the electric discharge machining stopped in S600. First, S9
After returning the Z-axis position to the Z-axis position at the start of electric discharge machining stored in the storage means 43 at S00, the process returns to S100.
At 0, the continuation of the numerically controlled electrical discharge machining that has been stopped is restarted, and the process returns to S500.

If it is determined in step S700 that the stop request is other than a temporary stop such as processing end or interruption, the operation is performed in accordance with a manual operation input by an operator in an operation such as removal of a workpiece, and the operation is completed. Then, in step S1200, in addition to the electric discharge machining operation stopped in step S600, the machining operation is stopped by the machining end processing unit 47 to terminate the electric discharge machining.

The above is the first embodiment.

Next, FIGS. 6 and 7 are flowcharts showing the operation of the electric discharge machine according to the second embodiment.

The second embodiment is a partial modification of the first embodiment, and is different from the first embodiment in that a stop request is issued in step S700 in FIG. In this case, the input operation of the -direction button 31fZ of the Z-axis is restricted even when the work is taken out until the electric discharge machining is finished in S1200.

The other parts are the same as in the first embodiment. The same parts as those in the first embodiment have the same reference numerals and the same drawings, and a description thereof will be omitted.

In FIG. 6, after it is determined in S700 that the stop request is other than the temporary stop such as the end of machining or interruption, the process proceeds to S700.
At 1100, among the movement command buttons 31f,
The input of the button 31fZ- in the-direction of the Z axis is restricted by the command restricting means 44, and the operator performs an operation such as taking out the workpiece. FIG. 7 shows a flowchart of the command restriction process at this time.

At S1110, it is determined whether a manual operation has been performed. If it is determined that no manual operation has been performed, the process returns to S1110. If it is determined that a manual operation has been performed, the process proceeds to S1120.

In S1120, the manual operation determined to be S1110 is performed by pressing the button 31 in the Z-axis direction.
It is determined whether the input operation is fZ-. Where Z
If it is not an axis-direction button input operation, S1130
Proceed to. However, if it is determined that the manual operation is a button input operation in the Z-axis direction,
Return to 1110.

In S1130, it is determined whether or not the manual operation is a command input operation for ending the work. If not, an operation according to the manual operation is performed, and the process returns to S1110.

By doing so, even if the user accidentally operates the button 31fZ- instead of the button 31fZ + when performing a manual operation to raise the Z-axis in order to take out the processed workpiece, As in the case of the first embodiment, when the command to move the spindle 11 to the workpiece 3 is invalidated, the spindle 11 does not move to the workpiece 3 as in the case of the temporary stop. There is no possibility that the engraved electrode 5 collides with the workpiece 3 which has been completely processed and the processing is not wasted.

If a manual operation for ending the electric discharge machining operation other than the Z axis-direction movement command has been performed in S1110, the process proceeds to S1200 through S1120 if it is determined in S1130 that the process has been completed. By the electric discharge machining control device 40, in addition to the electric discharge machining operation stopped in S600, the pump operation and the like are also stopped to end the electric discharge machining. If not, return from S1130 to S1110,
Request correct end processing operation for finishing the machining operation.

FIGS. 8 to 9 are flowcharts showing the operation of the electric discharge machine according to the third embodiment of the present invention.

The difference from the first embodiment is that the input operation of the -direction button 31fZ- of the Z-axis is conditionally received during the flow of the command input restriction.

In FIG. 8, the same portions as those in the flow of command input restriction of the first embodiment of FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

The difference from the first embodiment is that S820
In step S840, when it is determined that the input operation is the operation of the button 31fZ- in the Z-axis direction, the process proceeds to the Z-axis lowering restriction flow in S840.

FIG. 9 is a flowchart of the Z-axis lowering restriction.

In S841, if it is determined in S820 that the input operation is for the button 31fZ- in the Z-axis direction, it is determined whether or not the confirmation button 31c is pressed. If the confirmation button 31c is pressed, Proceeding to S843, the operation of the Z-axis direction button 31fZ- is accepted only while the confirmation button 31c is being pressed.

If it is determined in step S841 that the confirmation button 31c has not been pressed, the flow advances to step S842. Here, the storage unit 4
3 is compared with the Z-axis position at the start of machining stored in the Z-axis direction and the Z-axis position currently indicated by the Z-axis position detecting means 13, and the current position in the Z-axis + direction is more than the machining start position Only when it is far, the process proceeds to S843, and the operation of the Z-axis direction button 31fZ- is accepted only while the current position is farther in the Z-axis direction than the machining start position. When the operation is accepted and the spindle moves down and reaches the machining start position, the current position is no longer farther in the Z-axis + direction than the machining start position. -Operation will not be accepted.

By doing so, the Z-axis can be approached only a certain distance from the workpiece in the manual operation in S842, and if it is desired to approach the Z-axis manually within the certain distance in S841, Confirm button 3
By pressing 1c, the Z-axis descent by the manual operation is accepted only while the worker is paying attention. Therefore, the Z-axis descent by the manual operation during the pause may cause the nozzle 15 or the engraved electrode 5 to be erroneously operated. This can be performed without colliding with the workpiece 3.

In the third embodiment, S841 and S84
Although both are provided, only one of them may be used.

FIG. 10 is a flowchart showing the operation of the electric discharge machine according to the fourth embodiment of the present invention.

The difference from the second embodiment is that, after S1120 in the flow of command input restriction in FIG. 7, the input operation of the -direction button 31fZ- of the Z-axis is the same as in the third embodiment. There is a place to receive with.

In FIG. 10, the same portions as those in the flow of the command input restriction of the second embodiment of FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted.

The difference from the second embodiment is that S112
If it is determined at 0 that the input operation is the input operation of the button 31fZ- in the Z-axis direction, the process proceeds to the Z-axis lowering restriction flow of S840.

Since the Z-axis lowering restriction flow S840 is the same as the Z-axis lowering restriction S840 of the third embodiment,
The description is omitted.

[0081]

According to the present invention, when the manual operation is performed when the automatic operation by the numerical control of the electric discharge machining is temporarily stopped or the like, the manual operation for relatively bringing the spindle and the workpiece relatively close is limited. With this configuration, a manual operation can be performed so that the workpiece or the nozzle does not accidentally collide with the workpiece.

Further, the relative approach movement can be performed by the manual operation described above while the confirmation button is being pressed or when the spindle position is more apart from the workpiece than the spindle position at the start of machining. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wire cut electric discharge machine according to the present invention.

FIG. 2 is a configuration diagram of a die sinking electric discharge machine according to the present invention.

FIG. 3 is a block diagram of an electric discharge machine according to the present invention.

FIG. 4 is a flowchart according to the first embodiment of the present invention.

FIG. 5 is a flowchart of a command restriction process of the electric discharge machine according to the first embodiment of the present invention.

FIG. 6 is a flowchart according to a second embodiment of the present invention.

FIG. 7 is a flowchart of a command restriction process of the electric discharge machine according to the second embodiment of the present invention.

FIG. 8 is a flowchart of a command restriction process of an electric discharge machine according to a third embodiment of the present invention.

FIG. 9 is a flowchart of the Z-axis descent restriction of the command restriction processing of the electric discharge machine according to the third embodiment of the present invention.

FIG. 10 is a flowchart of a command restriction process of an electric discharge machine according to a fourth embodiment of the present invention.

Claims (3)

[Claims] In a machining control device for an electric discharge machine for executing machining controlled numerically according to a machining program prepared in advance, a position detecting means for detecting a spindle position, and a machining start detected by the position detecting means. Storage means for storing the main spindle position at the time, a determination means for determining whether the processing stop after the start of the processing is a temporary stop capable of continuing the resumption of the processing, interruption, stoppage of the other processing, or the end of the processing, Command stop means for restricting the execution of the work proximity movement command of the main spindle during the input movement command of the pause release processing when the processing stop is the above-mentioned pause, and commanding re-execution by the pause release processing When restarting the numerically controlled electrical discharge machining of the program, the Z-axis main shaft is once returned to the detection storage main shaft position at the time of the start of the machining, and thereafter, a return movement control means for controlling to resume. And the processing stops when a stop other than the pause, numerically controlled EDM machining control device of the electric discharge machine, characterized in that it comprises an end of processing processing means to terminate. 2. A machining control device for an electric discharge machine for performing machining controlled numerically in accordance with a machining program prepared in a predetermined manner, a position detection means for detecting a spindle position, and a machining start detected by the position detection means. Storage means for storing the main spindle position at the time, a determination means for determining whether the processing stop after the start of the processing is a temporary stop capable of continuing the resumption of the processing, interruption, stoppage of the other processing, or the end of the processing, Command stop means for restricting the execution of the work proximity movement command of the main spindle during the input movement command of the pause release processing when the processing stop is the above pause, and instructing re-execution by the pause release processing Return movement control means for controlling the Z-axis main shaft to return to the detection storage main shaft position at the start of the machining, and then to restart the numerically-controlled electric discharge machining of the program; The same command limiting means as the command limiting means, which limits execution of a work proximity movement command of the main spindle during an input movement command of an end processing operation when the machining stop is a stop other than the temporary stop. A second command restricting means, and a machining end processing means for terminating the numerically controlled electric discharge machining by inputting the end processing operation which is not restricted by the command restricting means. Control device. 3. The method according to claim 1, wherein the command restricting means restricts input of a workpiece proximity movement command of the spindle, and then, when there is an operation of a confirmation button, when the spindle position is smaller than the spindle position at the time of starting the machining. 3. The command restricting unit according to claim 1, wherein the command restricting unit validates the proximity movement command input when both or at one of the positions separated from the workpiece. A machining control device for the electric discharge machine according to the above.