JPS6161742A - Numerical control device - Google Patents

Abstract

PURPOSE:To aim at automation for trouble detection, by extracting the data required for trouble judgment upon processing a numeral command out of a command input part, while installing a trouble judging data processing part which adjusts the setting value of a trouble judging part according to these data. CONSTITUTION:Among numerical commands being inputted out of a command input part 1 and now processed by numerical control part 2, a numerical command processing part 5 extracts the data required for cutting trouble judgment such as detection command, feed speed, cutting rate, each override value, etc., via a trouble judging data processing part 5a, and transmits them to a cutting trouble judging part 4, while further extracts the data required for restration motion of a tool spring or the like via a restoration data processing part 5b and transmits them to a restoration processing part 6. The cutting trouble judging part 4 monitors a cutting state detecting signal to be inputted from a detecting part 3 on the basis of the setting value of trouble judgment adjusted by the said transmitted data, and when a state detection value exceeds the said setting value, it outputs a trouble detecting signal. Therefore, an optimum trouble judgment corresponding to cutting conditions is performable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a numerical control device, and particularly to a numerical control device having an abnormality detection function for a machine tool.

[Conventional technology]

FIG. 5 is a block diagram showing a conventional example of a numerical control device for a cutting machine. In the figure, A is a numerical control device having a numerical control section 2 that controls a cutting machine (not shown) based on numerical commands from a command input section 1 such as a tape league, and B is a numerical control device having a numerical control section 2 that controls a cutting machine (not shown) based on numerical commands from a command input section 1 such as a tape league. First, a cutting state detection signal is input from the detection unit 3 such as a sensor that detects the operating state of the cutting machine, and the detected state value is compared with a pre-input setting value to determine whether there is an abnormality in the cutting machine. This cutting abnormality detection device is externally attached to the numerical control device A and has a cutting abnormality determination section 4 that outputs an abnormality detection signal to the numerical control section 2.

The conventional device is configured as described above, and the cutting machine is controlled by the numerical control unit 2 based on numerical commands from the command input unit l, and the cutting abnormality determination unit 4 uses the M code etc. written in the numerical control program. The operating state of the cutting machine is monitored according to the detection command output from the numerical control section 2. The cutting abnormality determination section 4 compares the state detection value of the state detection signal from the detection section 3 with the set value, and when detecting an abnormality in the cutting machine, outputs feed/hold etc. as an abnormality detection signal to the numerical control section 2. , the feed is stopped, or an interrupt signal is output to start and execute a recovery program for tool evacuation, replacement, rework, etc., created in advance in accordance with the numerical control unit program.

[Problem that the invention seeks to solve]

Conventional devices detect abnormalities in machine tools as described above, but for example, when an operator changes cutting conditions such as override, the cutting abnormality determination unit 4
It is also necessary to change the setting values, which poses a problem in that it is difficult to fully automate the device.

The present invention has been made to solve these problems, and an object of the present invention is to provide a device in which a setting value for abnormality determination is automatically adjusted in accordance with a change in cutting conditions.

Another object of the present invention, in addition to the above object, is to provide a device that can automatically recover based on cutting conditions in the event of an abnormality.

[Means for solving problems]

The numerical control device according to the present invention includes an abnormality determination data processing section that processes numerical commands from the command input section, extracts data necessary for abnormality determination, and adjusts set values of the abnormality determination section based on this data. It is something that

Further, in another aspect of the present invention, there is further provided a recovery data processing unit that processes numerical commands from the command input unit, extracts and outputs data necessary for recovery operation, and when an abnormality detection signal is input from the abnormality determination unit; A restoration processing section is provided which creates a series of restoration commands based on the restoration data from the restoration data processing section and outputs them to the numerical control section.

[Effect]

In the present invention, the setting value of the abnormality determination section is adjusted based on the abnormality determination data extracted from the numerical command by the abnormality determination data processing section.

Further, in another aspect of the present invention, in the restoration processing section, a series of restoration commands are created using the restoration data extracted from the numerical commands by the restoration data processing section and sent to the numerical control section.

〔Example〕

Hereinafter, the present invention will be explained by showing examples. FIG. 1 is a block diagram showing an embodiment of a numerical control device according to the present invention, and the same reference numerals are used for the same or corresponding parts as in the conventional example shown in FIG. In the figure, 5 is a numerical command processing section provided between the command input section 1 and the numerical control section 2, and 6 is a restoration processing section that creates a restoration command in the event of an abnormality based on input data.

The numerical command processing section 5 processes numerical commands from the command input section l, extracts data necessary for abnormality determination, outputs the data to the cutting abnormality determination section 4, and adjusts the set value for abnormality determination. A determination data processing section 5a is provided, which further processes the numerical commands and extracts data necessary for recovery operations in the event of an abnormality.
A recovery data processing section 5b that outputs to the recovery processing section 6 is provided.

Note that in this embodiment, the cutting abnormality determination section 4. Numerical command processing section 5. A restoration processing section 6 is built into a numerical control device A including a numerical control section 2.

Next, the operation of this embodiment configured as above will be explained. The numerical command processing section 5 receives input from the command input section 1, and from among the numerical commands currently being processed by the numerical control section 2, outputs detection commands, feed speed, cutting speed, and each over/under through the abnormality judgment data processing section 5a. Data required for cutting abnormality determination such as ride amount is extracted and transferred to the cutting abnormality determination section 4, and data necessary for recovery operation such as tool path is extracted and transferred to the recovery processing section 6 via the recovery data processing section 5b. . The cutting abnormality determination section 4 monitors the cutting state detection signal inputted from the detection section 3 based on the abnormality determination setting value adjusted by the above-mentioned transferred data, and outputs an abnormality detection signal when the state detection value exceeds the above-mentioned setting value. do.

Therefore, it is possible to perform an optimal abnormality determination corresponding to the cutting conditions. For example, in a system that determines abnormalities based on changes in the load of an NC servo motor, if the operator changes only the override ■ with the same numerical command, the motor load will change approximately in proportion to the amount of override. By adjusting the set value for abnormality determination in proportion to the override amount, it is possible to maintain optimal abnormality detection sensitivity.

Further, when a cutting abnormality is detected by the cutting abnormality determination section 4, an abnormality detection signal is input to the recovery processing section 6, and the recovery processing section 6 outputs a stop command to the numerical control section 2, and
Based on the recovery data input from the recovery data processing unit 5b, a command to retreat to the tool exchange position, a spare tool exchange command,
Create a series of recovery commands such as a return command to the location where the abnormality occurred. This restoration command is transferred to the numerical command processing section 5, which restarts the numerical control section 2 and transfers the restoration command to the numerical control section 2 by interrupting the interrupted numerical command. When the recovery operation is completed, the transfer of numerical commands from the numerical command processing section 5 to the numerical control section 2 is resumed from the point where it was interrupted, and the cutting process is restarted from the point where the abnormality has occurred.

In the above embodiment, the cutting abnormality determination section 4, the numerical command processing section 5. Although the explanation has been given on the structure in which the recovery processing section 6 is built into the numerical control device A having the numerical control section 2, as shown in FIG. The same effect as in the above embodiment can be obtained even if the cutting abnormality detection device is built into the cutting abnormality detection device having the above-mentioned cutting abnormality detection device and is externally attached to the numerical control device A having the numerical control section 2. With this configuration, it is possible to automate the setting of abnormality determination criteria and automate the recovery operation when an abnormality occurs using an existing numerical control device.

Furthermore, in each of the above embodiments, an example was explained in which only recovery is performed when an abnormality is detected, but if an abnormality occurs in the pre-processing of multiple processes at the same location such as tapping, the recovery processing unit 6 or the numerical command It is also possible to configure so that the processing section 5 removes numerical commands for subsequent processes at the location where the abnormality has occurred, transfers them to the numerical side 71' section 2, and continues machining at the location other than the location where the abnormality has occurred.

Furthermore, in each of the above embodiments, the recovery data processing section 5b
and recovery processing unit 6, but if you only want to perform abnormality detection, you can omit each of the above parts as shown in Fig. 3 or 4, and the above implementation will still work for cutting abnormality detection. The same effect as in the example can be obtained.

In addition, in the case of a cutting abnormality detection device that compares the time data of the cutting load of the motor, etc. during normal machining with the current cutting load, the override amount from the numerical control device A shown in Fig. 2 or Fig. 4 is used. The numerical command processing section 5 may be configured to transfer only the following information to the cutting abnormality determination section.

〔Effect of the invention〕

As explained above, according to the numerical control device according to the present invention, the numerical commands from the command input section are processed to extract the data necessary for abnormality determination, and based on this, the set values of the abnormality determination section are set to All H. By providing the abnormality determination data processing section, the abnormality determination criteria are adjusted based on numerical commands, so there is an effect that automation of abnormality detection can be achieved.

Furthermore, a recovery data processing unit that processes numerical commands from the command input unit, extracts and outputs data necessary for recovery operation;
By providing a recovery processing unit that creates a series of recovery commands based on the recovery data from the recovery data processing unit and outputs them to the numerical control unit when an abnormality detection signal is input from the abnormality determination unit, recovery in the event of an abnormality is possible. This has the effect of automating operations.

[Brief explanation of drawings]

1 to 4 are block diagrams showing embodiments of the present invention, and FIG. 5 is a block diagram showing a conventional example. DESCRIPTION OF SYMBOLS 1... Command input part, 2... Numerical control part, 3... Detection part, 4... Abnormality determination part, 5a... Abnormality determination data processing part, 5b... Recovery data processing part, 6... Recovery processing unit, A... Numerical control device, B... Abnormality detection device. Note that the same reference numerals are used for the same or corresponding parts in the figures. Agent Masuo Oiwa (2 idiots) Fig. 1 4: f'7 Keiko Joban foot section 5a: Shindeni hand'' fixed tenut achiri section 5b: 1 purchase 1
8 Theta Disaster Fund Renewal Figure 2 B Cutting 8 Defeat Muji J Figure 3 Figure 5 Procedural Amendment (Voluntary) 60L26 Showa Year Month Date

Claims (6)

[Claims] (1) Compare the state detection values from the numerical control section that controls the machine tool based on numerical commands from the command input section and the detection section that detects the operating state of the machine tool with pre-input setting values. In a numerical control device equipped with an abnormality determination section that determines an abnormality in the machine tool and outputs an abnormality detection signal to the numerical control section, the numerical command from the command input section is processed to extract data necessary for abnormality determination. , a numerical control device comprising: an abnormality determination data processing section that adjusts a setting value of the abnormality determination section based on this. (2) The numerical control device according to claim 1, wherein the abnormality determination data processing section is incorporated in an abnormality detection device having an abnormality determination section. (3) The numerical control device according to claim 1, wherein the abnormality determination data processing section and the abnormality determination section are built into a numerical control device having a numerical control section. (4) Compare the state detection value from the numerical control section that controls the machine tool based on the numerical command from the command input section and the detection section that detects the operating state of the machine tool with the pre-input setting value. In a numerical control device equipped with an abnormality determination section that determines an abnormality in the machine tool and outputs an abnormality detection signal to the numerical control section, the numerical command from the command input section is processed to extract data necessary for abnormality determination. , an abnormality determination data processing unit that adjusts the set value of the abnormality determination unit based on this, and a recovery data processing unit that processes numerical commands from the command input unit to extract and output data necessary for recovery operation. and,
and a recovery processing section that creates a series of recovery commands based on the recovery data from the recovery data processing section and outputs them to the numerical control section when an abnormality detection signal is input from the abnormality determination section. Control device. (5) The numerical control device according to claim 4, wherein the abnormality determination data processing section, the recovery data processing section, and the recovery processing section are built into an abnormality detection device having an abnormality determination section. (6) The numerical value set forth in claim 4, wherein the abnormality determination data processing section, the abnormality determination section, the recovery data processing section, and the recovery processing section are incorporated in a numerical control device having a numerical control section. Control device.