JPH0573125A - Work monitoring system for nc machine tool - Google Patents

Abstract

PURPOSE:To easily detect the position of abnormality generated at a work and a work program generating the abnormality. CONSTITUTION:A controller on the side of an NC machine tool 2 detects the operating state of the machine tool, the state is successively updated and stored in a state data storage memory, and each time the change of a program number of a sequence number is detected, the values of the respective numbers are updated and stored in a program number storage register RM and a sequence number storage register RS. The NC machine tool 2 is successively polled by the processing of a cell controller 1, and the contents of the register RM or RS and the state data storage memory are read for each prescribed cycle and time sequentially stored in a process monitor file Fj of a nonvolatile RAM. The process monitor file Fj is outputted to a CRT display device or a printer by operating a keyboard, the program number of sequence number of a work program executed in the case of raising an alarm is detected, the abnormal part of the work is specified, and the work program is corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining monitoring system for NC machine tools.

[0002]

2. Description of the Related Art Machining monitoring in which abnormality of machining is notified by displaying an abnormality on a machine tool display screen or outputting an alarm sound by an alarm signal from various NC machine tools such as NC milling machines and NC lathes. The scheme is already known.

[0003]

In the conventional machining monitoring method, since the machining abnormality is only notified by the simple abnormality display and the output of the alarm sound, the workpiece in which the abnormality occurs, the location where the abnormality occurs, and the It is difficult to identify the machining program that was being executed when the abnormality occurred, it was difficult to determine the cause of the abnormality, and it was not easy to make appropriate corrections to the machining program. There was also a problem in terms of efficiency.

Therefore, an object of the present invention is to solve these drawbacks of the prior art and to easily detect an abnormal work piece, an abnormal place and an abnormal machining program. It is to provide the processing monitoring method of.

[0005]

According to the machining monitoring method of the present invention, while the operation state of the NC machine tool is detected by the controller of the NC machine tool, at least every time the execution block of the machining program is updated, the operation is being executed. By detecting the data for specifying the machining program position and storing the detected data for each NC machine tool in the management storage means in the control device or the management storage means in the cell controller in a time series at predetermined intervals. Achieved the purpose.

As data for specifying the machining program position, the program number of the machining program being executed and the sequence number of the block, or the main program number and sub program number of the machining program being executed and the sequence number of the block are used.

When the machining program has no distinction between the main program and the sub-program, the hierarchy of the machining program being executed is automatically identified by the control unit of the NC machine tool, and is being executed as data for specifying the position of the machining program. The program number of the machining program, its hierarchy, and the sequence number of the execution block are used.

Further, for a block for which a sequence number is not set in the machining program, the position of the block being executed is automatically detected by the controller of the NC machine tool, and the identification number is set as the sequence number, As data for identifying the machining program position, the program number of the machining program being executed, its hierarchy and sequence number are used.

[0009]

Data for detecting the operating state of the NC machine tool by the controller of the NC machine tool, and at least each time the execution block of the machining program is updated, data for specifying the position of the machining program being executed by the controller. To detect. The control device or cell controller of the NC machine tool stores the detection data for each NC machine tool in a management storage means in a time series at predetermined intervals.

If the program number of the machining program being executed and the sequence number of the execution block are used as the data for specifying the machining program position, the flow of the entire program can be easily grasped by the transition of the machining program number stored in time series. Further, the relationship between the execution block in each machining program and the operating state of the NC machine tool can be easily grasped.

If the main program number and the sub program number of the machining program being executed and the sequence number of the execution block are used as the data for specifying the machining program position, in addition to the flow of the entire program, the main program and the sub program are further added. It is possible to easily grasp the transition of the program between and, and moreover, it is possible to easily grasp the relationship between the execution block in each machining program and the operating state of the NC machine tool.

Furthermore, the hierarchy of the machining program being executed is set to N
C By automatically identifying by the control device of the machine tool and using as the data to specify the machining program position,
Even if the main program and the sub program are not defined in the machining program, it is possible to easily grasp the transition of the programs between the independent programs.

Also, the position of the block being executed is automatically detected by the controller of the NC machine tool, the identification number is set as a sequence number, and this sequence number is used as data for specifying the machining program position. Thus, even when the sequence number in the machining program is not set, the execution block in each machining program can be specified and the relationship with the operating state of the NC machine tool can be easily grasped.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a machining monitoring system of an apparatus according to an embodiment to which the method of the present invention is applied. The entire system includes a plurality of NC machine tools 2 and NC equipped with a controller.
A single cell controller 1 is connected to each of the machine tools 2 via a data transmission path 3.

The control device of the NC machine tool 2 is an ordinary numerical control device having a microprocessor, various memories, an input / output interface with the data transmission line 3, and the like, and has an alarm detection function similar to the conventional one. The predetermined machining program is carried out by sequentially executing preset machining programs to drive and control the respective parts of the machine tool. Further, the control device detects various operating states of the machine tool in operation by the processing of the microprocessor, and sequentially updates and stores the presence / absence of an alarm, the type, and the detection data of the operating state in the state data storage memory of the control device. It is supposed to do.

FIG. 4 is a conceptual diagram showing an example of the state data storage memory. In this embodiment, the current data of the operation mode, the axis movement state, the alarm state, the feed override, the spindle override, the spindle rotation and the time are the states. It is adapted to be updated and stored in the data storage memory. The operation mode is data indicating the selection status of manual operation or automatic operation, and normally changes in accordance with the switching operation of the control device operation panel. In addition, the axis movement state is data that indicates the cutting movement of the tool, the state of fast-forwarding, and the dwell, etc.
It is data showing the values of the tool feed speed and the spindle rotation speed as override values (percentage). Further, the spindle rotation is data indicating the rotation direction of the spindle, and each data of the axis movement state, feed override, spindle override, and spindle rotation normally changes in response to a program command when the machining program is executed. It is like this. Also,
The alarm detection function is activated when the system becomes inoperable due to the reading of a defective program, or when the microprocessor detects an abnormality in the servo system. Correspondingly, the alarm type in the status data storage memory indicates the type of abnormality. The code corresponding to is stored. The current time data from the timepiece device provided in the control device is updated and stored in the time field of the state data storage memory at predetermined intervals.

FIG. 2 is a block diagram showing a main part of the cell controller 1. The cell controller 1 is an input / output interface with the processor 10, the ROM 11, the RAM 12, the keyboard 15 and the data transmission path 3 as control means. 14, a non-volatile RAM 13 that serves as a storage means for management, a CRT display device 16 that serves as a data output means, and a printer 17 are provided. Hereinafter, the processor on the side of the cell controller 1 will be referred to as a CPU 10, and the processor of the NC machine tool 2 will be referred to as a CPU on the control device side to distinguish them.

Next, the machining monitoring system of the first embodiment in which the program number of the machining program being executed and the sequence number of the block are used as the data for specifying the machining program position based on the above-mentioned configuration will be described. .. In this embodiment, whether the program being executed is in the main program or in the sub program is not particularly identified, and the flow of the entire program is clarified by the transition of the machining program number stored in time series, and each block in the machining program is clarified. And the operating state of the NC machine tool, the control device of each NC machine tool 2 has a program number storage register RM and a sequence number storage register RS in addition to the state data storage memory.
(See FIG. 5).

FIG. 3 is a flow chart showing an outline of the "program position specifying data detecting process" which is repeatedly executed by the control unit side CPU of each NC machine tool 2 in the first embodiment every predetermined period during execution of the machining program. ..

The control unit side CPU that has started the "program position specifying data detection process" first determines whether or not the program number of the machining block being executed has changed (step S01), and the program number has changed. If so, the new program number is updated and stored in the program number storage register RM on the control device side (step S0
2) If there is no change in the program number, the value of the program number storage register RM is held as it is. And
Further, it is determined whether or not the sequence number regarding the machining block being executed has changed (step S03), and if the sequence number has changed, a new sequence number is updated and stored in the sequence number storage register RS on the control device side. On the other hand (step S04), if there is no change in the sequence number, the value of the sequence number storage register RS is held as it is. Therefore, the value of the program number storage register RM on the control device side is updated every time a new independent machining program is started, and the value of the sequence number storage register RS starts a new block in each program. The result is updated every time.

For example, if one of the NC machine tools 2 performs machining according to a machining program as shown in FIG. 17, first, 001 is stored in the program number storage register RM at the stage when the main program 001 is started. The sequence number MS1 of the first block in the main program 001 is stored in the sequence number storage register RS. Below, the main program 001
Each time the processing of the next block in is started, only the value of the sequence number storage register RS is MS2, MS3, MS.
4 and so on, and when the transition to the subprogram 002 is executed by the command of the fourth block in the main program 001, 0 is set in the program number storage register RM.
02 will be updated and stored. At this time, the value of the sequence number also changes from MS4 to SF1, so SF1 is updated and stored in the sequence number storage register RS.

On the other hand, the CPU 10 of the cell controller 1
Sequentially polls the control device side CPU of each NC machine tool 2 every predetermined period, and the values of the program number storage register RM and the sequence number storage register RS of the NC machine tool 2 that have been polled and the state of the control device This NC is read by reading the current contents in the data storage memory.
Each detection data is stored in time series in the process monitoring file Fj set in the non-volatile RAM 13 corresponding to the machine tool, but the time when the CPU 10 of the cell controller 1 goes around each NC machine tool 2 and polls. Is the control device side C
Since the PU is set shorter than the time to execute the processing of one block, at least 1 in the machining program is set.
Each time the processing of the block is executed, the value of the program number storage register RM and the value of the sequence number storage register RS of the NC machine tool 2 and the current value of the state data storage memory are stored in the process monitoring file Fj. Become.

FIG. 6 is a conceptual diagram showing the values of the program numbers and sequence numbers stored in the process monitoring file Fj when the NC machine tool 2 carries out machining according to the machining program as shown in FIG. Note that in FIG. 6, the program number and the sequence number are assumed to be synchronized with the time when the CPU 10 of the cell controller 1 goes around each NC machine tool 2 to poll and the time when the control unit side CPU executes the processing of one block. However, when polling is performed on the NC machine tool 2 twice or more while the value of the sequence number storage register RS is held, that is, the polling time of polling is longer than that of one block. When the cycle is short, the same program number and sequence number may be stored in multiple lines of the process monitoring file Fj. Even if the same program number and sequence number are stored in a plurality of lines of the process monitoring file Fj, the control device side CP
If the update cycle of the state data storage memory by U is shorter than the execution time of one block, the contents of the state data,
For example, there may be a difference in data such as presence or absence of an alarm such as a servo abnormality and time.

The data of the process monitoring file Fj is input by the operator via the keyboard 15 of the cell controller 1 by designating the individual famous j of each NC machine tool 2 and inputting a data output command. 1
It can be displayed or printed out as shown in FIG.

Process monitoring file Fj in this embodiment
However, it is not possible to directly know whether the value of the program number stored in each line is that of the main program or that of the sub program, but the flow of the entire program can be changed by the change of the machining program number stored in time series. Since it is possible to grasp the relation between the block in each machining program, that is, the sequence number and the operating state of the NC machine tool, it is easy to correct the program in response to the occurrence of an alarm. .. Since the value of the program number substantially indicates the shape of the work, the work to be machined can be known if the program number at the time of alarm occurrence is known, and an error has occurred depending on the value of the sequence number. It is possible to know the part on the work when.

Next, the machining monitoring system of the second embodiment in which the main program number and sub program number of the machining program being executed and the sequence number of the block are used as the data for specifying the machining program position will be described. In this embodiment, when the main program and the sub program are not distinguished from each other in the machining program, the hierarchy of the machining program being executed is automatically identified by the controller of the NC machine tool, and the main program and the sub program are identified. , That is, the transition of programs between independent programs is clarified so that the relationship between each block in the machining program and the operating state of the NC machine tool can be easily grasped. In addition to the state data storage memory, the second control device includes a required number of program number storage registers R (1), R (2),
It has R (3), ... And a sequence number storage register RS (see FIG. 8).

FIG. 7 is a flow chart showing an outline of the "program position specifying data detecting process" which is repeatedly executed by the control unit side CPU of each NC machine tool 2 at predetermined intervals during execution of the machining program in the second embodiment. ..

The control unit side CPU that has started the "program position specifying data detection process" determines whether or not the program number relating to the machining block being executed has changed (step S11), but at the stage of starting the machining program. Since the independent program serving as the main program is read first, the program number changes at this stage, and the determination result of step S11 becomes true. Therefore, the CPU on the control device side stores the program number storage register R (i-1) based on the value of the nesting management index i having an initial value of 0 (the value of i is set to "0" in the initial setting).
Value of the program number storage register R (-1) is compared with the program number of the machining program at the present time (step S12), but the value of the program number storage register R (-1) is not set. Because of this, the discrimination results inevitably become inconsistent. Therefore, the control unit side CPU increments the value of the nesting management index i (step S13), and based on the value of the index i, the program number of the machining program at the present time is stored in the program number storage register R (1) of the first layer. That is, the program number of the independent program serving as the main program is stored (step S14).

Further, since it is determined that the value of the sequence number has changed when the independent program which is the main program is read and the first block of this program is started (step S15), the sequence number storage register RS First, the sequence number of the first block of the independent program serving as the main program is stored (step S16).

Thereafter, if no change in the program number is detected, the CPU on the control device side each time the processing of the next block in the independent program serving as the main program is started (step S15), the value of the sequence number storage register RS. Only that will be sequentially updated and stored (step S16).

When another independent program is started by a block command in the independent program while the independent program which is the main program is executed,
The program number of the machining program currently being executed changes and is detected by the CPU on the control device side (step S
11). Therefore, the CPU on the control device side determines the program number storage register R based on the current value of the nesting management index i.
The value of (i-1), that is, the program number storage register R
The value of (0) is compared with the program number of the machining program at the present time (step S12), but since the value of the program number storage register R (0) has not been set, the determination result inevitably does not match. Therefore, the control device side C
The PU increments the value of the nesting management index i (step S13), and based on the value of the index i, the program number storage register R (2) of the second hierarchy stores the program number of the current machining program, that is, the first The program number of the independent program which is the sub-program is stored (step S14).

When a third independent program, which is different from the independent program which is the main program, is started while the independent program which is the first sub-program is executed, the program number of the machining program which is currently being executed is started. Change occurs, and again, step S11 and step S12
Of the program number storage register R (i-1) based on the current value of the nesting management index i.
Value, that is, the value of the program number storage register R (1) is compared with the program number of the machining program at the present time. In this case, the value of the program number storage register R (1) becomes the main program. Since it is the program number of the program and different from the program number of the third independent program, the determination result of step S12 is false, and the control device side CPU increments the value of the nesting management index i (step S13), Based on the value of the index i, the program number of the machining program at the present time, that is, the program number of the third independent program serving as the second subprogram is stored in the program number storage register R (3) of the third hierarchy. (Step S14).

On the other hand, when the independent program which is the first sub-program is completed and the independent program which is the main program is returned to, the program number of the machining program which is being executed is changed, and the same operation as described above is performed. The determination process of step S11 and step S12 is executed, and based on the current value of the nesting management index i, the value of the program number storage register R (i-1), that is, the value of the program number storage register R (1), The program number of the machining program at the present time is compared. In this case, the value of the program number storage register R (1) is the program number of the independent program which is the main program, and is the same as the program of the program currently being executed. Therefore, the determination result of step S12 becomes true, and the control device side CPU Based on the value of the sting management index i, the value of the program number storage register R (2), that is, the program number of the independent program that is the first subprogram is cleared (step S17), and the value of the nesting management index i is set. Decrement (step S1
8). Therefore, when another independent program is started again after returning to the independent program which is the main program, the program number storage of the second hierarchy for storing the program number of the independent program which is the first sub-program The program number of this independent program is stored again in the register R (2).

For example, if one of the NC machine tools 2 performs machining according to a machining program as shown in FIG. 17, first, when the independent program 001 which is the main program is started, the determination result of step S11 is True, the determination result of step S12 is false, the value of the nesting management index i is incremented from 0 to 1 (step S13), and the program number 001 is stored in the program number storage register R (1) of the first hierarchy. (Step S14) Also, the sequence number storage register R
The sequence number MS1 is stored in S (step S
15). Hereinafter, every time the processing of the next block in the program of the program number 001 is started, only the value of the sequence number storage register RS is MS2, MS3, MS4.
... will change (Step S15, Step S1
6) The value of the nesting management index i at this stage is held at 1.

Then, the independent program 0 is issued by the instruction of the fourth block in the independent program of program number 001.
When the shift to 02 is performed, a change in the program number is detected, and the determination process of steps S11 and S12 is performed again. However, since the determination result of step S12 is false, the nesting management index i Is incremented from 1 to 2 (step S13), the program number 002 of the independent program serving as the first subprogram is stored in the program number storage register R (2) of the second hierarchy (step S14), and The value of the sequence number storage register RS is updated to SF1 (step S15, step S16). Next, when the processing of the next block in the independent program of the program number 002 is started, only the value of the sequence number storage register RS changes to SF2 (steps S15 and S).
16), the value of the nesting management index i at this stage is held at 2.

Then, the independent program 0 is issued by the instruction of the second block in the independent program of program number 002.
When the shift to 03 is performed, the change in the program number is detected again, and the determination processing in steps S11 and S12 is performed. However, the value of the program number storage register R (2-1) is the main program. Since the program number is 001 of the independent program which is different from the program number 003 of the currently executed independent program, the determination result of step S12 is false, and the value of the nesting management index i is incremented from 2 to 3 (step S13), the program number 003 of the independent program serving as the second subprogram is stored in the program number storage register R (3) of the third hierarchy (step S
14) Further, the value of the sequence number storage register RS is updated to SS1 (step S15, step S1).
6). Hereinafter, each time the processing of the next block in the program of program number 003 starts, only the value of the sequence number storage register RS changes to SS2, SS3, ... (Steps S15, S16), but nesting at this stage The value of the management index i is held at 3.

Then, when the processing of the third block in the independent program with the program number 003 ends and the return to the independent program 002 is performed, the change in the program number is detected again, and the steps S11 and S are executed.
12, the value of the program number storage register R (3-1) is the program number 002 of the independent program which is the first subprogram, and the value of the independent program currently being executed is Program number 0
Since it coincides with 02, the determination result of step S12 becomes true, and the control device side CPU determines the program number storage register R (3) of the third layer based on the value of the nesting management index i.
Value, that is, the program number 003 of the independent program to be the second subprogram is cleared (step S
17), the value of the index i is decremented from 3 to 2 (step S18), and the sequence number storage register RS
Is updated to SF3 (step S15, step S
16). Hereinafter, each time the processing of the next block in the program of program number 002 is started, only the value of the sequence number storage register RS changes to SF4, SF5, ... (Steps S15, S16), but nesting at this stage The value of the management index i is held at 2.

Next, when the processing of the fifth block in the independent program with the program number 002 ends and the return to the independent program 001 is performed, the change in the program number is detected again, and the steps S11 and S are executed.
12, the value of the program number storage register R (2-1) is the program number 001 of the independent program which is the main program, and the program number 00 of the independent program currently being executed.
Since it matches with 1, the determination result of step S12 becomes true, and the control device side CPU determines the program number storage register R (2) of the second layer based on the value of the nesting management index i.
Value, that is, the program number 002 of the independent program that is the first subprogram is cleared (step S
17), the value of the index i is decremented from 2 to 1 (step S18), and the sequence number storage register RS
Value of MS is updated to MS5 (step S15, step S
16). When the processing of the next block in the program of program number 001 is started, only the value of the sequence number storage register RS changes to MS6 (step S1.
5, step S16), the value of the nesting management index i at this stage is held at 1.

Then, the independent program 0 is issued by the instruction of the sixth block in the independent program of program number 001.
When the shift to 04 is executed, a change in the program number is detected again, and steps S11 and S12 are again performed.
However, since the value of the program number storage register R (1-1) is not set and does not match the program number 004 of the independent program currently being executed, the determination of step S12 is performed. The result is false, the value of the nesting management index i is incremented again from 1 to 2 (step S13), and the program number 004 of the independent program to be the subprogram is stored in the program number storage register R (2) of the second hierarchy. (Step S14) Further, the value of the sequence number storage register RS is updated to ST1 (step S15, step S16).

Thereafter, by the same processing as described above, the program number storage registers R (1), R (2), R (3), ...
In each of the above, the program number of the independent program serving as the main program and the program numbers of the independent programs of all hierarchies from the independent program to the independent program having the block currently being executed are always stored in accordance with the hierarchical order of hierarchy. The value of the nesting management index i is initialized to 0 again when a new independent program serving as the main program is read.

The processing on the side of the cell controller 1 is the above-mentioned first step.
The CPU 10 is substantially the same as that of the embodiment, and each CPU machine tool 2
The control device side CPU is sequentially polled every predetermined period, and the program number storage register R of the NC machine tool 2 is polled.
Each value of (1), R (2), R (3), ..., The value of the sequence number storage register RS and the current contents in the status data storage memory of the control unit are read, and this NC is read.
Each detection data is stored in time series in the process monitoring file Fj set in the nonvolatile RAM 13 corresponding to the machine tool.

FIG. 9 is a conceptual diagram showing the values of the program numbers and sequence numbers stored in the process monitoring file Fj when the NC machine tool 2 carries out the machining according to the machining program as shown in FIG. According to the process monitoring file Fj in this embodiment, in addition to the time-series transition of the machining program, the hierarchy of the machining program being executed is automatically identified by the controller of the NC machine tool and the main program is selected. Distinction from subprograms, that is,
The transition of programs between independent programs can be clarified, and each block and N in the machining program
Since the relationship with the operating state of the C machine tool can be more easily grasped, the program can be corrected more easily in response to the alarm. For example, in the process monitoring file of the first embodiment shown in FIG. 6, the program numbers of the programs including the executed blocks are only displayed in chronological order, and under what circumstances each program is executed. In order to know the sequence number, it is necessary to analyze the arrangement state of the program numbers in the direction of time series. According to the process monitoring file Fj shown in FIG. It is possible to immediately identify whether it is called as a program. Note that, in FIG. 9, the sequence number transition is omitted due to space limitations, and the data is displayed based on the transition and restoration points of the independent program.
At least, the polling process is executed every time one block process on the machining program is executed. Therefore, as in the case shown in FIG. 6, a large number of polling processes are performed corresponding to the program numbers and their combination modes. Sequence numbers and status data are stored.

Further, the processing shown in FIG. 10 is the machining monitoring method of the third embodiment in which the machining program position is specified by using the main program number and sub program number of the machining program being executed and the sequence number of the block. The actual processing content is described in the above second item.
This is almost the same as the embodiment. However, in the second embodiment, the value of the nesting management index i is sequentially incremented at the time of shifting from the upper hierarchy independent program to the lower hierarchy independent program, and the program number of the lower hierarchy independent program is stored in the program number storage register R (i. ) Are sequentially stored (steps S12 to S14), and when the lower-layer independent program returns to the upper-layer independent program, the program number of the lower-layer independent program is cleared to determine the value of the nesting management index i. (Step S12, step S17 to step S14), the value of the nesting management index i is changed at the time of shifting from the upper-layer independent program to the lower-layer independent program in the third embodiment. Is incremented sequentially and independent professionals in the lower hierarchy The program number of the RAM is stored in the program number storage register R (i), the value of the index i is stored in the layer storage register RP (steps S22 to S25), and the independent program of the lower layer is independent of the upper layer. Even after returning to the program, the value of the program number relating to the independent program in the lower hierarchy is retained in the program number storage register R (i) as it is, and only the value of the nesting management index i is decremented and stored in the hierarchy storage register RP. By (step S22, step S28, step S2
5) The point that the hierarchy of the independent program being executed is indicated depending on the value of the hierarchy storage register RP is different. Also,
Also in this case, the value of the nesting management index i is initialized to 0 again when a new independent program serving as the main program is read.

The processing on the side of the cell controller 1 is the above-mentioned first step.
And is substantially equivalent to the second embodiment, and the CPU 10 is
The control device side CPU of the machine tool 2 is sequentially polled every predetermined period, and each value and sequence number of the program number storage registers R (1), R (2), R (3), ... The value of the storage register RS, the value of the hierarchical storage register RP, and the current contents (see FIG. 11) in the state data storage memory of the control device are read and the NC
Each detection data is stored in time series in the process monitoring file Fj set in the nonvolatile RAM 13 corresponding to the machine tool.

FIG. 12 is a conceptual diagram showing the values of the program number and sequence number stored in the process monitoring file Fj when the NC machine tool 2 carries out machining according to the machining program as shown in FIG. The program number of the executed independent program of the lower hierarchy is retained without being erased, and the program number of the independent program executed at this stage is specified by the value of the hierarchy read from the hierarchy storage register RP in each cycle. The difference from the second embodiment as shown in FIG. 9 is that it is done, but the substantial effect is exactly the same as that of the second embodiment.

FIG. 13 shows a sequence in which the position of the block being executed is automatically detected by the control unit CPU when the sequence number in the machining program is given every predetermined number of blocks or not at all. It is a flow chart which shows an outline of processing set up as a number (note that this processing can be used even if a sequence number is assigned to each block). Steps S15 to 16 of the second embodiment shown in FIG. 7 and steps S26 to S27 of the third embodiment shown in FIG.
It is used instead of processing. That is, the processing is based on the assumption that the hierarchy of the independent program to which the block being executed belongs is detected. When this processing is used, the processing of step S18 in FIG. 7 and the processing of step S28 in FIG. 10 are performed. At the stage where the value of the nesting management index i is decremented by, the upper layer return detection flag F
, And a required number of generation number storage registers RS (1), RS (2), for storing the sequence numbers generated for each boundary layer (each independent program).
RS (3), ... (See FIG. 14) are provided.

Hereinafter, referring to the flow chart of FIG.
A process for generating and setting a sequence number will be described.

In this case, since there is no guarantee that the sequence number is defined for each block, first, as a process to replace step S15 of the second embodiment and step S26 of the third embodiment, the next block is processed. The start will be detected (step S31). When the start of the next block is detected, the control device side CPU first
Whether or not the upper hierarchy return detection flag F is set,
That is, it is determined whether or not this execution block has just been restored from the independent program of the lower hierarchy to the independent program of the upper hierarchy (step S32).

At this time, if the upper layer return detection flag F is not set, it means updating the execution block in the independent program or updating the execution block relating to the transition from the upper layer to the lower layer. Side C
The PU does not execute the processing of steps S33 to S34 and determines whether or not a sequence number is defined in this execution block (step S35). And
If the sequence number is defined, the value of the sequence number detected this time is updated and stored in the generation number storage register RS (i) corresponding to the layer under execution based on the value of the nesting management index i (step S36). , If the sequence number is not defined, the generation number storage register R
The value of S (i) is incremented to automatically generate a sequence number (step S38), and in any case, the generation number storage register RS (i) corresponding to the layer being executed.
The current value of is stored in the sequence number storage register RS (step S37).

On the other hand, if the result of the determination in step S32 is false, that is, if it is determined that this execution block has just returned from the independent program in the lower hierarchy to the independent program in the upper hierarchy, Since the independent program that has been executed up to now, that is, the independent program of the i + 1th layer has ended, the control unit side CPU
Initializes the value of the generation number storage register RS (i + 1) corresponding to the independent program of the i + 1 layer to 0 (step S33), resets the upper layer return detection flag F (step S34), and then performs the same step as above. S35
The subsequent processing will be carried out.

For example, if the sequence numbers of the third and fourth blocks of the independent program 001 and the first to third blocks of the independent program 002 are undefined as in the example shown in FIG. 18, the sequence number storage The value of the sequence number stored in the register RS changes as shown below.

First, the upper hierarchy return detection flag F is not set at the initial stage, and the first program of the independent program 001 is not set.
Since the sequence numbers are defined in both the second block and the second block, first, the processing of step S31, step S32, and steps S35 to S37 is executed every time the first and second blocks of the independent program 001 are started. , At each stage, generation number storage register RS
(1) and the value of the sequence number storage register RS are sequentially updated to MS1 and MS2. However, since the sequence number is not defined in the third and fourth blocks of the independent program 001, the third block of the independent program 001
And when the fourth block is started, step S35
Of the generation number storage register RS (1) are sequentially incremented and changed to MS2 + 1 and MS2 + 2 in the process of step S38, and thus the values MS2 + 1 and MS2 + 2 are stored in the generation number storage register RS.
(1) and is sequentially updated and stored in the sequence number storage register RS.

Then, in response to the instruction of the fourth block of the independent program 001, the transition to the independent program 002 is carried out, and the processing of the first block of the independent program 002 is started, but the first block of the independent program 002 is started. Since the sequence number is not defined in, the determination result of step S35 becomes false at the stage when the first block of the independent program 001 is started, and the value of the nesting management index i is updated from 1 to 2. Therefore, in the processing of step S38, the generation number storage register RS (2)
Of the sequence number storage register RS and the generation number storage register RS (2)
Will be updated and stored in. Generation number storage register R
Since the initial values of S (1), RS (2), RS (3), ... Are all 0, the generation number storage register RS at this time
(2) and the value of the sequence number storage register RS are both updated to 1. In addition, the second of the independent program 002
When the processing of the block is started, both the values of the generation number storage register RS (2) and the sequence number storage register RS are updated to 2 in the same manner as described above.

Then, the command of the second block of the independent program 002 shifts to the independent program 003 and the processing of the first block of the independent program 003 is started, but the first block of the independent program 003 is started. Has a sequence number defined therein, and the value of the nesting management index i has been updated from 2 to 3, so that step S31, step S32, and step S35 are executed at the stage when the first block of the independent program 003 is started. The process from step S37 is executed, and the values of the generation number storage register RS (3) and the sequence number storage register RS are both updated to SS1. Further, since the sequence numbers are defined in all the blocks of the independent program 003, the generation number storage register RS
Both (3) and the value of the sequence number storage register RS change to SS2, SS3 ....

Next, the processing of the third block of the independent program 003 ends and the processing returns to the third block of the independent program 002. However, since the third block of the independent program 002 has no sequence number defined. At the stage when the third block of the independent program 002 is started, the determination result of step S35 becomes false, and the value of the nesting management index i is updated from 3 to 2, so the generation number is stored in the process of step S38. Register R
The value of S (2) is incremented from 2 to 3, and this value 3 is updated and stored in the generation number storage register RS (2) and the sequence number storage register RS. Further, since the upper layer return detection flag F is set by the return from the lower layer to the upper layer, the process of step S33 is executed and the value of the generation number storage register RS (3) is initialized to 0. It will be. Independent program 002
Since the sequence numbers are defined for all the fourth and subsequent blocks of, the generation number storage register RS
Both (2) and the value of the sequence number storage register RS change to SF4, SF5 ....

Thereafter, the CPU on the control device side repeatedly executes the same processing. However, when the independent program of the upper layer is transferred to the independent program of the lower layer, the generation number storage register RS (i- of the upper layer). While retaining the value of 1), when returning from the independent program of the lower layer to the independent program of the upper layer, the value of the generation number storage register RS (i + 1) of the upper layer is initialized, and the sequence number is defined. If not, the generation number storage register RS (i) corresponding to the hierarchy of the independent program currently being executed
Is sequentially incremented to generate a sequence number, and the value of the sequence number corresponding to the hierarchy of the independent program being executed is transferred to the cell controller 1 via the sequence number storage register RS. The value of the generation number storage register RS (1) is initialized to 0 again when a new independent program serving as the main program is read.

The processing on the side of the cell controller 1 is the above-mentioned first step.
This is substantially the same as that of the third embodiment, and the CPU 10 sequentially polls the control device side CPU of each NC machine tool 2 for every predetermined cycle, and the program number storage registers R (1), R (2 of the NC machine tool 2 are used. ), R (3), ..., The value of the sequence number storage register RS and the current contents in the status data storage memory of the control device are read and set in the nonvolatile RAM 13 corresponding to this NC machine tool. Each detection data is stored in time series in the process monitoring file Fj.

FIG. 15 applies the process of FIG. 13 to the process of the second embodiment as shown in FIG.
9 is a conceptual diagram showing values of a program number and a sequence number stored in a process monitoring file Fj when machining is performed according to a machining program as shown in FIG. Figure 1
According to the process shown in 3, even if there is a block for which the sequence number has not been set, the position of the block being executed is automatically detected by the control unit CPU and set as the sequence number, and this sequence number is set. Since it can be stored in the process monitoring file Fj, the relation between each block and the operating state of the NC machine tool can be easily grasped regardless of the presence or absence of the sequence number, and the program can be easily corrected when an alarm occurs. Is. In this case, a sequence number that does not exist in the program list may be displayed, or depending on the step size of the predefined sequence number, etc., it may overlap between the generated sequence number and the sequence number on the program list. Occasionally, the sequence number can be prevented from being confused by inserting an identification symbol such as "*" at the stage of storing the sequence number generated in step S38 in the sequence number storage register RS. (See FIG. 15). Since the value of the generated sequence number is incremented with the latest defined sequence number as an initial value, the number of blocks is counted by referring to the process monitoring file Fj and the program list to obtain the generated sequence number. The corresponding block can be found from the program list.

Even when the hierarchy of the independent program to which the block being executed belongs is not detected, that is, even when the processing shown in FIG. 3 is performed, the position of the block being executed is determined by the control device side. It is possible for the CPU to automatically detect and set as a sequence number. FIG.
Is a flowchart showing an example thereof.

In this case, the control unit side CPU which has started the "program position specifying data detection process" first determines whether or not the program number of the machining block being executed has changed (step S41). If it has changed, the new program number is updated and stored in the program number storage register RM on the control device side (step S42), and further, the sequence number storage register RS
Is initialized to 0 (step S43). If the program number has not changed, the value of the program number storage register RM is held as it is, as in the first embodiment. Then, it is determined whether or not the processing of the next block is started (step S44), and if a new execution block is started, it is determined whether or not a sequence number is defined in this execution block (step S44). S45). And
If the sequence number is defined, this sequence number is stored in the sequence number storage register RS (step S46). If the sequence number is not defined, the value of the sequence number storage register RS is incremented and this value is The sequence number of the execution block is reset in the sequence number storage register RS (step S47).

Therefore, when the independent program of the lower hierarchy is restored to the independent program of the upper hierarchy, unless the sequence number is attached to the execution block of the restoration destination in the upper hierarchy, the execution block of the restoration destination is However, since the sequence number 1 is always set, since the execution process of the independent program is stored in the process monitoring file Fj in time series, it is necessary to detect the sequence number at the time of shifting from the upper layer to the lower layer. Thus, the position of the execution block at the time of returning can be easily specified.
Further, even when the hierarchy display of the independent program is not performed in the processing as shown in FIGS. 3 and 16, only the hierarchy is detected so that the plurality of generation number storage registers R
By providing (i), it becomes possible to continuously increment the value of the sequence number set in the execution block of the return destination.

In the above embodiments, the state data storage memory on the side of the control device has been described as storing the current data of the operation mode, the axis movement state, the alarm state, the feed override, the spindle override, the spindle rotation direction and the time. Is other data that indicates the state of the NC machine tool, in addition to the alarm state, various detected current values and program set values, as well as any necessary data, depending on the configuration of the NC machine tool, are displayed. Can be used. Further, the time data does not necessarily need to be stored in the state data storage memory on the control device side by the processing of the CPU on the control device side, and the CPU 1 on the cell controller 1 side
The data may be stored in the process monitoring file Fj when 0 stores the data detected by the polling process.

[0063]

According to the machining monitoring system of the present invention, the detection data relating to the operation state of the NC machine tool and the detection data specifying the machining program position are stored in correspondence with each other in a time series at predetermined intervals. It is possible to easily specify the position of the machining program in which the abnormality has occurred, the abnormal part of the work, and the like, and it is easy to correct the machining program.

[Brief description of drawings]

FIG. 1 is a block diagram showing a processing monitoring system for an apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a main part of a cell controller in the apparatus of the embodiment.

FIG. 3 is a flowchart showing a main part of processing in the first embodiment of the method of the present invention.

FIG. 4 is a conceptual diagram showing an example of a state data storage memory.

FIG. 5 is a conceptual diagram showing transfer data in the first embodiment.

FIG. 6 is a conceptual diagram showing a process monitoring file in the first embodiment.

FIG. 7 is a flowchart showing the main parts of the processing in the second embodiment of the method of the present invention.

FIG. 8 is a conceptual diagram showing transfer data in the second embodiment.

FIG. 9 is a conceptual diagram showing a process monitoring file in the second embodiment.

FIG. 10 is a flowchart showing a main part of processing in a third embodiment of the method of the present invention.

FIG. 11 is a conceptual diagram showing transfer data in the third embodiment.

FIG. 12 is a conceptual diagram showing a process monitoring file in the third embodiment.

FIG. 13 is a flowchart showing a process for generating a sequence number for a block for which a sequence number has not been set.

FIG. 14 is a conceptual diagram showing transfer data in which a generated sequence number is set.

FIG. 15 is a conceptual diagram showing a process monitoring file that stores generated sequence numbers.

FIG. 16 is a flowchart showing another process for generating a sequence number for a block whose sequence number has not been set.

FIG. 17 is a conceptual diagram showing a processing program example.

FIG. 18 is a conceptual diagram showing an example of a machining program including blocks with undetermined sequence numbers.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 cell controller 2 NC machine tool 3 data transmission path 4 cell controller 13 non-volatile RAM 15 constituting a storage means for management 15 keyboard 16 CRT display device 17 printer RM program number storage register RS sequence number storage register Fj process monitoring file

Claims (7)

[Claims] 1. An NC machine tool control device detects an operating state of an NC machine tool, and at least detects data identifying a machining program position being executed each time an execution block of the machining program is updated. A machining monitoring system for an NC machine tool, wherein each detection data is stored in a time series in a predetermined cycle in a management storage means in the control device. 2. A program number of a machining program being executed and a sequence number of an execution block are used as data for identifying a machining program position.
The machining monitoring method for the NC machine tool described. 3. A machining program in which a position of a block being executed is automatically detected by a control device of an NC machine tool and the identification number is set as a sequence number for a block in which a sequence number is not set in the machining program. The machining monitoring system for an NC machine tool according to claim 2, wherein the program number of the machining program being executed and the sequence number of the execution block are used as the data for specifying the position. 4. The machining monitoring system for an NC machine tool according to claim 2, wherein a main program number and a sub program number of a machining program being executed and a sequence number of an execution block are used as data for specifying a machining program position. .. 5. A program number of a machining program being executed, its hierarchy, and an execution block as data for automatically identifying a hierarchy of a machining program being executed by a control device of an NC machine tool and specifying a machining program position. The machining monitoring system for an NC machine tool according to claim 2, wherein the sequence number is used. 6. A machining program, in which a position of a block being executed is automatically detected by a controller of an NC machine tool for a block for which a sequence number is not set in the machining program, and the identification number is set as a sequence number. 6. The machining monitoring system for an NC machine tool according to claim 4, wherein the program number of the machining program being executed, its hierarchy and the sequence number of the block are used as the data for specifying the position. 7. The NC machine tool control device detects an operating state of the NC machine tool, and at least detects data identifying a machining program position being executed each time an execution block of the machining program is updated, Instead of the control device of the NC machine tool, a cell controller connected to a plurality of NC machine tools so that data can be transmitted detects detection data from each NC machine tool at predetermined intervals,
Each NC is stored in the storage means for management in the cell controller.
7. The NC machine tool according to claim 1, claim 2, claim 3, claim 4, claim 5, or claim 6, wherein the detection data for each machine tool is stored in a time series at predetermined intervals. Processing monitoring method.