JPH09222911A - Method for diagnosing fault for nc machine tool and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate necessity to change a fault diagnostic program even when any function control program is added or changed. SOLUTION: Based on a fault generate signal to be outputted when any fault is generated at an NC machine tool 7, a fault diagnostic processing part 13 receives a fault diagnostic program 25 from a program storage part 11 and starts executing this program and, according to a combination list, part programs consisting of a function control program 1 under operating are retroactively executed based on the combination list so that the operation of a most significant main program is stopped. At the same time, a fault number and a fault level are read from the part program and, corresponding to these fault number and fault level, fault diagnostic processing is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an NC machine tool failure diagnosing method and apparatus for diagnosing a failure occurring in an NC machine tool and its accessory device.

[0002]

2. Description of the Related Art Generally, an NC machine tool such as an NC milling machine, a machining center or an NC electric discharge machine has a function control program for controlling the function of the NC machine tool stored therein in advance to control the operation of the NC machine tool. A failure diagnosis program for diagnosing a failure in the operation of the NC machine tool is also stored, and the failure diagnosis is automatically performed. This failure diagnosis program carries out failure diagnosis in a one-to-one correspondence with the function control program. Therefore, when the function control program is added or changed, the failure diagnosis program must be added or changed. For example, Japanese Unexamined Patent Publication No. 6-110508 discloses a production management device that can easily find the cause of a failure that has occurred in a production line while looking at a screen. When the failure occurrence recognizing means recognizes the occurrence of a failure, this production control device turns on the highest-level node in which the details of the failure are hierarchically organized by group, and normally determines whether or not the failure has occurred. It is determined by the ON / OFF state of the upper node, and the nodes in the ON state are sequentially traced toward the end of the hierarchical structure to investigate the cause of the failure. In other words, since the failure content corresponding to the control program is hierarchically structured for each group, the cause of the failure can be clarified without searching for all the failure content information.

[0003]

When the technique described in the above-mentioned conventional technique is applied to an NC machine tool, the function control program and the failure diagnosis program of the NC machine tool have a one-to-one correspondence.
It is necessary to create it according to the above, and if there is a change or addition to the function control program, the failure diagnosis program must also be added or changed.
There was a problem that it took time to change. Also, in the technique disclosed in Japanese Patent Laid-Open No. 6-110508, when the function control program is changed, the hierarchical structure of the failure content also has to be changed, which also causes a problem that it takes time to add and change the failure diagnosis program. It was

In view of the above problems, the present invention eliminates the need to change the failure diagnosis program even if the function control program is added or changed, and the failure number and the failure level can be selected from the part programs constituting the function control program. It is an object of the present invention to provide a NC machine tool failure diagnosis method and apparatus that reads both or both of them and performs failure diagnosis processing according to the failure number and failure level.

[0005]

In order to solve the above-mentioned problems, the present invention provides an NC machine tool failure diagnosis method for diagnosing a failure that has occurred in an NC machine tool and its accessory device. In advance, a plurality of function control programs, a combination list showing a combination of a plurality of part programs constituting the function control program in the order of operation of the part programs, and a failure diagnosis program for performing failure diagnosis processing when a failure occurs in advance. Remember, the N
C. Execution of the failure diagnosis program is started based on a failure occurrence signal output when a failure occurs in the machine tool, the process code is read from the function control program in operation by the failure diagnosis program, and the process number is read. The part program is traced back in accordance with the combination list corresponding to, the operation of the main program at the top of the part program is stopped, and at least one of the failure number and the failure level is read from the part program, and the failure diagnosis program Provided is a failure diagnosis method for an NC machine tool which performs a failure diagnosis process such as continuing the operation of a function control program, waiting for an instruction from an operator, or stopping according to the read failure number and failure level.

Further, in the NC machine tool failure diagnosis apparatus for diagnosing a failure occurring in the NC machine tool and its accessory device, a plurality of function control programs created for each function of the NC machine tool and the function control program. And a function control program storage unit that stores in advance a combination list that shows a combination of a plurality of part programs that make up a part program in the order of operation of the part programs, a failure diagnosis program that performs failure diagnosis processing when a failure occurs, and a failure in the NC machine tool. When the failure diagnosis program is output, the failure diagnosis program is started to execute, the process number is read from the function control program operating by the failure diagnosis program, and the combination list corresponding to the process number is read. According to the top of the part program An instruction by the operator to stop the operation of a certain main program, read at least one of the failure number and the failure level from the part program, and continue the operation of the function control program according to the failure number and the failure level. Provided is a failure diagnosis device for an NC machine tool, which is provided with a failure diagnosis processing unit that performs failure diagnosis processing such as waiting and stopping.

[0007]

According to the present invention, the failure diagnosis processing unit starts the execution of the failure diagnosis program based on the failure occurrence signal output when a failure occurs in the NC machine tool, and constitutes the function control program in operation. The part program is traced back in accordance with the combination list, the operation of the main program at the top of the part program is stopped, both the failure number and the failure level, the failure number or one of the failure levels is read from the part program, and the failure number is read. The failure diagnosis processing is performed according to the failure level.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration block diagram of a fault diagnosis device for an NC machine tool showing an embodiment of the present invention. FIG. 2 is a flowchart showing the failure diagnosis method according to the embodiment of the present invention. FIG. 3 is a configuration block diagram showing a specific example of the relationship between the function control program and the failure diagnosis program in the embodiment of the present invention. FIG. 4 is an explanatory diagram showing a combination of a combination of part programs forming a function control program and a failure diagnosis program according to the embodiment of the present invention. FIG. 5 is an exemplary diagram showing an example of screen display on the display unit according to the embodiment of the present invention.

First, the configuration of one embodiment will be described with reference to FIG. The NC machining program is output from the automatic programming device 1, and the NC machining program and the machining data are sent to the NC machine tool 7 via the interface 5 by adding the machining data such as tool data received by the DNC device 3 to the machining program. The desired processing is performed. Each function of the DNC device 3 operates by reading the function control program 21 from the program storage unit 11 into the DNC device 3 and executing it.

The program storage unit 11 includes a plurality of function control programs 21 for controlling the functions of the DNC device 3.
A combination list 23 showing combinations of part programs constituting the function control program 21 in the order of operation of the part programs, and a failure diagnosis program 25 for performing failure diagnosis processing when a failure occurs are stored. The function control program 21 is created for each function of the DNC device 3, and includes a main program for displaying a screen necessary for an operator to operate and a plurality of combined programs for operating the functions instructed by the main program. It consists of a part program. The combination list 23 is a list showing a combination of a plurality of part programs constituting the function control program 21 created for each function in the order of operation of the part programs, and each combination list is given a process number.

The failure diagnosis processing unit 13 reads a failure diagnosis program 25 stored in advance in the program storage unit 11, receives a failure occurrence signal output when a failure occurs in the NC machine tool 7, and fails. Diagnostic program 25
Is started, the process number is read from the function control program 21 in operation by the failure diagnosis program 25, and the combination list 2 corresponding to the process number is read.
Go back to the part program according to 3 and stop the operation of the main program at the top of the part program,
Read the failure number and / or failure level from the part program, and continue the operation of the function control program according to the read failure number and failure level, wait for the operator's instruction, stop, etc. Perform fault diagnosis processing. The display unit 9 also includes the DNC device 3
The screen display data for the operator to perform the necessary operation is transmitted from the device, and the operation screen is displayed.

The operation of the failure diagnosis program 25 executed by the failure diagnosis processing unit 13 will be described with reference to FIG. In response to a failure occurrence signal output when a failure occurs in the DNC device 3 or the NC machine tool 7 (step S
1), the failure diagnosis processing unit 13 based on the failure occurrence signal
To start executing the failure diagnosis program (step S
2). Then, the process number of the function control program is read from the operating function control program (step S
3). The combination list corresponding to the read process number is read from the program storage unit 11, the part programs forming the function control program are traced back in order according to the combination list, and the operation of the main program at the top of the part programs is stopped ( Step S
4).

Next, the failure number and / or the failure level is read from the part program of the function control program that was operating immediately before (step S5).
Depending on the read failure number and failure level, failure diagnosis processing such as continuing the operation of the function control program as it is, waiting for an operator's instruction, or stopping is performed (step S6). The function control program name is read from the process number of the function control program (step S
7), read function control program name, step S
The failure number and the failure level read in 5 are displayed on the display unit 9 (step S8).

As a concrete example of the function control program 21, D
The configuration of the file reading function of the NC device 3 is shown in FIG. The main program and the part program constituting this file reading function are composed of a DNC screen display program 211, a status check program 212, a file open program 213, and a file read program 214. First, the DNC screen display program 2
11 is executed, and the operation screen necessary for operating the DNC device 3 is displayed on the display unit 9. When the file reading function is instructed from this operation screen, the status check program 21
2 is started, and the state of the DNC device 3 is checked. Next, when the status check of the DNC device 3 is completed, execution of the file open program 213 is started,
The commanded file is found from the storage device of the DNC device 3 in which a plurality of NC machining programs are stored. When the commanded file is found and the file opening is completed, the execution of the file reading program 214 is started to read the commanded file.

When a failure such as file read failure or read format mismatch occurs during this file reading, the failure diagnostic program 25 is started to be executed based on the failure occurrence signal output from the DNC device 3. The failure diagnosis program 25 reads the process number of the file read function control program, and the program storage unit 1
According to the combination list 23 stored in No. 1, the operation of the DNC screen display program is stopped in the order from the file reading program 214. Next, the failure number and the failure level are read from the file reading program 214, and a state is waited for the operator's instruction according to the failure number and the failure level. Further, the display unit 9 displays the function control program name, the failure number and the failure level. The contents displayed on the display unit 9 will be described later.

The above is the file reading program 21.
Although the case where a failure occurred while 4 was being executed was described, the DNC screen display program 211, the status check program 212, the file open program 2
Even when a failure occurs during execution of 13, the failure diagnostic program 25 reads the process number of the function control program as shown by the broken line in FIG. 3, and the sequence is traced back in sequence by the combination list corresponding to the process number, and the DNC screen display is performed. The program 211 is stopped, the failure number and the failure level are read from the part program that was operating when the failure occurred, and the operator waits for an instruction from the operator or the operation according to the read failure number and failure level. Performs failure diagnosis processing such as stopping.

FIG. 4 shows the combination of the main program and the part program in the function control program. Each part program has its own failure number and failure level. Further, the connection between these main programs and each part program is linked based on the program number of the part program for connecting the next operation written in each part program. First, the execution of the part program 1 is started by a command from the main program, the execution of the part program 2 is started when the operation of the part program 1 is completed, and the execution of the part program 3 is started when the operation of the part program 2 is completed. To be done. For example, when a failure occurs during the operation of the part program 3, the failure diagnosis program is linked to the part program 3, the part programs are traced back in order, the main program is stopped, and the failure number and the failure level are output from the part program 3. Is read and the failure diagnosis processing is performed by the failure diagnosis program.

FIG. 5 shows an example of the failure diagnosis screen of the display unit 9. On the failure diagnosis screen, a function control program name display section 91 that displays the program name found from the process number of the function control program, and a failure that displays the failure number corresponding to the machine failure read from the part program of the function control program There are a number display section 92 and a failure level display section 93 for displaying the failure level. As the failure level, ignore, caution, warning, stop, etc. are displayed. In addition, the name of the actuator such as the limit switch or solenoid that caused the failure and the cause of the interruption of the program are displayed on the message display unit 94 as a message. Further, a post-processing selection switch 95, which is a soft key for the operator to select how to perform subsequent processing according to these conditions, is provided. Further, a help switch 96 is provided in which details of the failure corresponding to the failure number and a recovery method or a coping method are stored so that the operator can refer to the information when necessary.

The functions of the DNC device 3 include a machining schedule function, data communication, a state monitor, etc., and the program storage unit 11 stores a plurality of function control programs 21 for each of these functions. As another embodiment, for example, when the automatic tool change function of the NC machine tool is in operation and the operation of the tool change arm has not been completed within a certain period of time, which causes a failure, the function control of the tool change function is performed. In the multiple part programs that make up the program, trace back in order from the part program that controls the operation of the exchange arm, stop the operation of the tool change function, and then specify the failure number and failure level from the part program that was operating immediately before. The operator can check the details of the failure by reading it and displaying the failure number and failure level on the display unit.
As described above, the failure diagnosis processing of the present invention can be generally applied to other failure diagnosis of NCNC machine tools.

[0020]

As described above, according to the present invention,
The failure number and failure level are written in advance in each part program that constitutes the function control program, and the failure number and failure level are read from the part program that was running when the failure diagnostic program occurred, and the combination program is traced back in order. Since the main program of the highest level is searched and the operation of the main program is stopped, standard failure diagnosis can be performed for the failure. In other words, if one general-purpose fault diagnosis program is prepared, the fault diagnosis of all function control programs can be performed in the same way without preparing a fault diagnosis program corresponding to the function control program on a one-to-one basis. The operator's operation when the failure diagnosis is executed is unified, and the operability is improved. Further, when the function control program is added or changed, the failure number and the failure level corresponding to each part program are written without changing the failure diagnosis program. Fault diagnosis processing becomes possible. That is, since it is not necessary to change the failure diagnosis program when adding or changing the function control program, there is no need to change the failure diagnosis program each time the function control program is added or changed.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a fault diagnosis device for an NC machine tool showing an embodiment of the present invention.

FIG. 2 is a flowchart showing a failure diagnosis method according to an embodiment of the present invention.

FIG. 3 is a configuration block diagram showing a specific example of a relationship between a function control program and a failure diagnosis program in FIG.

FIG. 4 is an explanatory diagram showing a combination of a combination of part programs constituting the function control program in FIG. 1 and a failure diagnosis program.

FIG. 5 is a view showing an example of screen display on the display unit according to the embodiment of the present invention.

[Explanation of symbols]

 1 Automatic Programming Device 3 DNC Device 5 Interface 7 NC Machine Tool 9 Display Unit 11 Program Storage Unit 13 Fault Diagnosis Processing Unit 21 Function Control Program 23 Combination List 25 Fault Diagnosis Program

Claims (3)

[Claims] 1. A failure diagnosis method for an NC machine tool for diagnosing a failure occurring in an NC machine tool and its accessory device, comprising: a plurality of function control programs created for each function of the NC machine tool; and the function control program. A combination list showing a combination of a plurality of part programs constituting a part program in the order of operation of the part programs and a failure diagnosis program for performing failure diagnosis processing when a failure occurs are stored in advance, and output when a failure occurs in the NC machine tool. The execution of the failure diagnosis program is started based on a failure occurrence signal, the process code is read from the function control program in operation by the failure diagnosis program, and the part program is traced back in accordance with the combination list corresponding to the process number. , The operation of the main program at the top of the part program At the same time as stopping, reading at least one of the failure number and the failure level from the part program, and instructing the operator to continue the operation of the function control program according to the failure number and the failure level read by the failure diagnosis program. A failure diagnosis method for an NC machine tool, characterized by performing a failure diagnosis process such as waiting or stopping. 2. An NC machine tool failure diagnosis apparatus for diagnosing a failure that has occurred in an NC machine tool and its accessory device, wherein a plurality of function control programs created for each function of the NC machine tool and the function control program. And a function control program storage unit that stores in advance a combination list that shows a combination of a plurality of part programs that constitute the part program in the order of operation of the part programs, a failure diagnosis program that performs failure diagnosis processing when a failure occurs, and a failure in the NC machine tool. When the failure diagnosis program is output, the failure diagnosis program is started to execute, the process number is read from the function control program operating by the failure diagnosis program, and the combination list corresponding to the process number is read. And go back to the top of the part program according to The operator is instructed to stop the operation of the main program, read at least one of the failure number and the failure level from the part program, and continue the operation of the function control program according to the failure number and the failure level. A failure diagnosis device for an NC machine tool, comprising: a failure diagnosis processing unit that performs failure diagnosis processing such as waiting and stopping. 3. The fault diagnosis processing unit further displays at least one of a name of a function control program in operation, a fault number read from the part program, and a fault level on the display unit. N described in
C Machine tool failure diagnosis device.