JPH10146722A - Discharge processing control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine proper processing conditions in accordance with progress of processing in a discharge processing control device. SOLUTION: A check pulse generating command part 8 commands generation of check pulses in the case where a processing power source is disconnected during jumping action. A jump time short-circuitting detection part 9 detects if a short circuit condition is formed or not during jump action. A pull-up command part 10 gives a command to pull up a shaft till the short circuit condition is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric discharge machining control device for controlling an electric discharge machine.

[0002]

2. Description of the Related Art An explanation will be given by taking an example of sinking electric discharge machining.
FIG. 8 is a block diagram showing an example of a configuration of a conventional electric discharge machining control device. A conventional electric discharge machining control device includes a CPU 1 for overall control, a machining data storage unit 2 for storing data such as machining conditions, a machining program storage unit 3 for storing a machining program, and a time for a user to perform gap control. And a time measuring unit 5 for measuring whether or not the time for performing the gap control has elapsed.
And an electrode position controller 6 for controlling the position of the electrode, and a machining power controller 7 for controlling the machining power. The gap control operation and the jump operation are periodically repeated at the time instructed by the machining program or the time directly instructed by the user through the user interface 4.

FIG. 9 is an example showing a state of a sinking electric discharge machining. Processing is performed by applying a voltage between the electrode and the workpiece (between the electrodes), causing the electrode to approach the workpiece in the working fluid, and causing a discharge between the electrodes. The electric discharge machining control device controls the distance between the electrodes so as to keep the discharge voltage constant. This is called a gap control operation. If the electric discharge continues, machining dust accumulates between the poles and discharges through the machining scrap, so that stable machining cannot be maintained. Therefore,
After performing the gap control operation for a predetermined time, as shown in FIG. 10, an electrode lifting operation called a jump is performed to urge the discharge of the processing waste. During the jump operation, there are cases where the machining power is kept on and cases where it is turned off.

[0004]

When a deep hole is machined in an electric discharge machine, if cutting chips are caught between an electrode side surface and a workpiece, a short circuit may occur even during a jump operation. In such a case, the jump operation is over,
Even if the process shifts to the gap control operation as it is, the state remains short-circuited, and not only does processing not proceed, but also the processed surface can be damaged.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a jump control method in a case where a short-circuit state is recognized during a jump operation in an electric discharge machining control apparatus. In the second aspect, by raising the shaft until the axis is canceled, the gap control operation is not performed for a predetermined period of time even if the gap control operation is performed, and the process is shifted to the jump operation to perform machining in a short-circuit state. It is characterized by providing an electric discharge machining control device capable of avoiding performing.

[0006]

FIG. 1 is a block diagram showing the configuration of an electric discharge machining control apparatus according to a first aspect of the present invention.
The same parts as those in the related art are denoted by the same reference numerals and description thereof is omitted. An electric discharge machining control device according to a first aspect of the present invention includes:
A check pulse generation command unit 8 for commanding generation of a check pulse when the machining power is turned off during the jump operation, and a short circuit detection unit during jump for detecting whether or not a short circuit occurs during the jump operation. 9, a pull-up command section 10 that issues a command to pull up the shaft when the short-circuit condition is eliminated during the jump operation until the short-circuit condition is eliminated.
Is provided.

FIG. 2 is a flowchart showing a processing flow of the electric discharge machining control apparatus according to the first invention of the present invention. The electric discharge machining control device of the first invention first determines whether or not a jump is being performed (step S1), and if it is during a jump, determines whether or not machining power is on (step S2). If the processing power is not turned on, a check pulse is generated to detect a short circuit state (step S3). Then, it is determined whether or not a short circuit has occurred (step S4). The determination of whether or not a short circuit has occurred
If the voltage between the electrode and the workpiece is lower than a predetermined reference value, it is determined that a short circuit has occurred. If a short circuit condition is observed, the shaft is raised until the short circuit condition is cleared. If it is determined in step S1 that a jump is not being performed, the process ends. If the processing power is turned on in step S2, the process proceeds to step S4. If it is not a short-circuit state in step S4, the process is repeated from step S1.

For example, as shown in FIG. 5, it is assumed that machining chips are caught between the side surface of the electrode and the workpiece, resulting in a short circuit state. Then, it is assumed that no machining waste is discharged even when the electrode is pulled up by a predetermined jump distance J0. At this time, the electric discharge machining control device of the first invention further raises the electrode.
Then, as illustrated in FIG. 6, it is assumed that when the workpiece is raised to the distance J <b> 1, the processing waste is separated from the gap, and the short circuit state is eliminated. Here, the electric discharge machining control device of the first invention ends the jump operation and shifts to the gap control operation. Thereby, it is possible to prevent the transition to the gap control operation in the short-circuit state.

On the other hand, due to the jump control specifications,
In some cases, it may not be possible to raise the axis further than the specified jump distance during the jump operation. In such a case, the second invention of the present invention is applied.
FIG. 3 is a block diagram showing the configuration of the electric discharge machining control device of the second invention. The same portions as those of the conventional technology and the first invention are denoted by the same reference numerals, and description thereof is omitted. An electric discharge machining control device according to a second aspect of the present invention is a continuous jump command unit that issues a command to shift to a jump operation without performing a gap control operation for a predetermined time based on a signal from a short circuit detection unit 9 during a jump. 11 is provided.

FIG. 4 is a flowchart showing a processing flow of the electric discharge machining control device according to the second invention of the present invention. The same steps as those in the first invention are denoted by the same reference numerals and description thereof will be omitted. If it is determined in step S4 that the short-circuit condition has occurred, the process proceeds to the jump operation without performing the gap control operation for a predetermined time (step S6).

Here, the situation of FIG. 5 is assumed again. Second
When a short-circuit state occurs during a jump operation as shown in FIG. 7, the electric discharge machining control device ends the predetermined jump operation, and does not perform the gap control operation for a predetermined time even if the operation shifts to the gap control operation. Move to Thereby, discharge of the processing waste is promoted, and the short-circuit state which adversely affects the workpiece can be quickly eliminated.

[0012]

According to the present invention, if a short-circuit state is recognized during the jump operation, the gap control operation is not performed until the short-circuit state is eliminated.
It is effective in progress of processing and maintenance of a good processed surface.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an electric discharge machining control device according to a first invention of the present invention.

FIG. 2 is a flowchart showing a processing flow of the electric discharge machining control device of the first invention in the present invention.

FIG. 3 is a block diagram showing an example of an electric discharge machining control device according to a second invention of the present invention.

FIG. 4 is a flowchart showing a processing flow of the electric discharge machining control device of the second invention in the present invention.

FIG. 5 is a diagram showing an example in which shavings are clogged in the sinking electric discharge machining.

FIG. 6 is a diagram showing an example in which the machining waste of FIG.

FIG. 7 is a diagram showing a relationship between an axis position and time in a gap control operation and a jump operation.

FIG. 8 is a diagram showing an example of an electric discharge machining control device according to a conventional technique.

FIG. 9 is a diagram showing an example of a gap control in the sinking electric discharge machining.

FIG. 10 is a view showing an example of a jump of a die sinking electric discharge machining.

[Explanation of symbols]

1 CPU, 2 processing data storage, 3 processing program storage, 4 user interface, 5 time measurement, 6 electrode position control, 7 processing power control, 8 check pulse generation command, 9 jump short-circuit detection, 10 Pull-up command section, 11 Continuous jump command section.

Claims (3)

[Claims] 1. An electric discharge machining control apparatus which periodically repeats a gap control operation and a jump operation for a predetermined time, wherein, if a short circuit condition is recognized during the jump operation, means for raising the shaft until the short circuit condition is eliminated is provided. An electric discharge machining control device characterized by the above-mentioned. 2. In an electric discharge machining control apparatus which periodically repeats a gap control operation and a jump operation for a predetermined time, if a short-circuit state is recognized during the jump operation, the jump operation ends and the predetermined gap control operation starts. An electric discharge machining control device comprising means for shifting to the next jump operation without performing a time gap control operation. 3. The apparatus according to claim 1, further comprising: means for generating a check pulse instead of a processing pulse when the processing power is turned off during a jump operation. EDM control device.