JPS59115124A - Electric discharge machining device - Google Patents

Abstract

PURPOSE:To securely and accurately carry out maintenance before the whole system becomes inoperative by providing more than one integrating time clock which generates signals when a set time is reached, and more than one sensor which detects the operating condition of maintenance-requiring parts. CONSTITUTION:In an electric discharge machining device, the signals detected by sensors 18, 20 which are installed in maintenance-requiring parts 14, 16 are transduced into analog voltage in a detected quantity-voltage transducing circuit 26 and inputted into an NC device 24. Also, a comparison circuit 30 compares the detected signals from the sensors 18, 20 with the set value and converts the detected signals into the percentage of the set value. And these data are sent to an alarm circuit 34, which, in turn, generates alarms in plural number of stages for each maintenance-requiring part. These alarms, together with the display time of an integrated time indicator 38, preset reference time, and percentage, are displayed with top priority on a display unit 36. Thereby, accurate maintenance can be performed before the whole system becomes inoperative.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric discharge machining apparatus, and particularly to one controlled according to commands from an NC (numerical control) device.

This type of electric discharge machining apparatus uses maintenance-required parts that require replacement or inspection when a certain reference time or a certain reference value is reached.

FIG. 1 shows an example of a conventional device of this type. In the apparatus shown in the figure, maintenance-required parts 14 and 16 are used in a machine body 10 and a machining power supply board 12, respectively, of the electrical discharge machining apparatus. Additionally, sensors 1s and zo are provided to detect the operating states of these maintenance-required parts 14 and 16,
The detection results of these sensors 1g and 2G are displayed on a display 20 such as a meter or inputted to an NC device 24.

On the other hand, the NC device 24 controls the entire electric discharge machining apparatus while giving operation commands to the machine body 10 and the machining power supply panel 12, and conversely receiving and receiving the results of one operation.

In the above configuration, the detection results of the sensors 18 and 20 are displayed on the display 22.

The operator operates the apparatus while checking the display 22 on a daily basis and confirming that the condition of each maintenance-requiring part 1B, 2G is within the standard value. If the condition of the maintenance-requiring parts 1B, 20 reaches the standard value, appropriate measures are taken as soon as it is discovered. In addition, if a sensor is used that outputs a signal when the condition of the maintenance-requiring parts 18 and 20 reaches a reference value, that signal is input to the NC device 24, and the signal is inputted to the NC device 24 to interrupt processing such as cutting out or stopping the machine during the machine sequence. Make it act as a lock signal. Then, when the interlock is activated, maintenance of the parts requiring maintenance is performed.

However, in the electric discharge machining apparatus having the above-mentioned configuration, there have been cases where the operator neglects to inspect the equipment or the operator makes different judgments. This often leads to catastrophic failures that bring down the entire system. Further, even if the state of the parts requiring maintenance is detected by a sensor and the state is input to the NG device, the operator will only know the necessity of maintenance after processing is finished or the machine is stopped. For this reason, the maintenance must be performed after the system has come to a stopped state, which has the disadvantage that it takes a lot of time and money to restore the system.

This invention was made in view of the above-mentioned conventional problem, and its purpose is to provide an electrical discharge machining device that can be maintained reliably and appropriately before the entire system becomes inoperable. It is in.

In order to achieve the above object, the present invention provides a plurality of integrating time meters that output a signal when a set time is reached, and detects the operating state of maintenance-required parts in an electrical discharge machining machine that is controlled according to commands from a numerical control device. It is equipped with multiple sensors that set maintenance reference times and maintenance reference values for each maintenance-requiring part, and displays the current status as a percentage of the reference time and reference value, as well as displaying the reference time and reference value. It is characterized by the ability to issue a warning in multiple stages until the

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 2 shows an embodiment of the electrical discharge machining apparatus according to the present invention. Its basic configuration is the same as that of the conventional example described above, so the explanation will be omitted. In the same figure, parts requiring maintenance 14.16
Detection signals from sensors 18 and 20 attached to the sensor are converted into analog voltages by a detection amount voltage conversion circuit 26 and input to the NC device 24 . In the NC device 24, the analog voltage is converted into a digital quantity by the A/D conversion circuit 28, and then sent to the comparison circuit 30. On the other hand, each maintenance required part 14,
The maintenance reference value at t6 is set in advance in the reference value setting circuit 32 from the outside of the NC device 24, and this set value is sent to the comparison circuit 3o. The comparison circuit 30 compares the detection signals from the sensors 1B and 20 with the set value, and converts the detected signal into a percentage of the set value. The data converted to a percentage is sent to the alarm circuit 34. This alarm circuit 34 displays multiple levels of alarms for each maintenance-requiring component together with generated data on a display device 36 such as a CRT with the highest priority.

Also provided is an integrating time meter 38 that operates only when the machine is in operation. The time data from the hour meter 38 is sent to the comparison circuit 42 along with setting data that has been manually entered into the reference time setting circuit 40 from the outside in advance in correspondence to each maintenance-required component. This comparison circuit 42 converts the time data into percentage data of the setting data. The converted percentage data is sent to alarm circuit 34. As a result, the alarm circuit 3
4 generates multiple levels of alarms for each maintenance-requiring part.

Further, the warning is displayed on the display device 36 with the highest priority, together with the display time of the cumulative time meter 38, the set reference time, and the percentage. Here, the alarm from the detection signal of the sensor 18, 20 and the alarm from the integration time meter 38 are logically summed with each other.

In the above embodiment, the multi-stage display is visually performed using a CRT or the like, but it is of course possible to use an acoustic display device such as an alarm generator or a sound generator. .

As described above, in the electrical discharge machining apparatus according to the present invention, the current status of each maintenance-requiring part is displayed in terms of the reference time and the reference value treatment rate, and alarms are issued in multiple stages until the reference time and reference value are reached. With this configuration, maintenance can be performed reliably and appropriately before the entire system becomes inoperable.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing the main parts of a conventional electrical discharge machining device.
FIG. 2 is a configuration diagram showing the main parts of an electrical discharge machining apparatus according to an embodiment of the present invention. Identical members in each figure are given the same reference numerals, and 10 is the main body of the machine;
12 is a processing power supply panel, 14.16 is a maintenance required part, 18.2
0 is a sensor, 24 is an NO device, 26 is a detection amount voltage conversion circuit, 28 is an A/D conversion circuit, 30 is a comparison circuit, 3
2 is a reference value setting circuit, 34 is an alarm circuit, 36 is a display device, 38 is an integrating time meter, 40 is a reference time setting circuit, and 42 is a comparison circuit. Agent Patent Attorney Shin Kuzuno - (and others) Commissioner of the Japan Patent Office 1. Indication of the case: Japanese Patent Application No. 57-225315 2, Name of the invention: Discharge heating device 3, Part 5: To the representative of the person making the amendment: Hitoshi Katayama, 5, Subject of the amendment or more

Claims (1)

[Claims] (1) Electrical discharge machining equipment that is controlled according to commands from a numerical control device is equipped with a plurality of integrating time meters that output a signal when a set time is reached, and a plurality of sensors that detect the operating status of parts that require maintenance. A function that sets a maintenance standard time and maintenance standard value for each maintenance part, displays the current status as a percentage against that standard time and standard value, and issues an alarm at multiple stages until the standard time and standard value are reached. An electrical discharge machining device characterized by comprising: