JPH06202723A - Numerically controlled machine tool - Google Patents

Abstract

PURPOSE:To automatically generate a restoring program which executes the processing necessary for restarting NC working program by comparing the machine state for interruption and that for re-execution with each other to restore the machine state to that for interruption at the time when execution of the working program is restarted from the interrupt position after being interrupted. CONSTITUTION:When an NC working program 103 is interrupted, the state of an MC machine tool at this time is stored. When an operator restarts the NC working program 103 after performing the interrupting operation, the state of the NC machine tool at this restart time is grasped and is compared with the stored NC state to generate a restoring program 123. When working is restarted, the stored NC state is restored after execution of the generated restoring program 123, and the part following the interrupt position of the NC working program 103 is executed hereafter, thereby restarting the NC working program 103 from the interrupt position. Thus, the operation left unexecuted is proceeded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerically controlled machine tool, and more particularly to facilitating re-execution of a machining program after interruption of its execution, facilitating checking of the machining program, and promptly executing auxiliary command processing. The present invention relates to a numerically controlled machine tool.

[0002]

2. Description of the Related Art In recent years, numerical control devices (CN
Machine tools using C) (numerical control machine tools) have spread,
Automation and labor saving are being promoted in the processing field. The numerically controlled machine tool is composed of a numerical controller (CNC), a high-voltage sequence circuit, and a machine tool. The heavy-duty sequence circuit is located between the CNC and the machine tool and performs various auxiliary tasks. Conventionally, the heavy-duty sequence circuit is normally made up of 200 to 300 relay circuits, depending on the scale of the machine. Just as NC moved from wiring logic NC to CNC, the high-voltage sequence circuit also changed from a relay circuit to a programmable controller (P
C) has become mainstream.

The PC includes a general-purpose PC and a built-in P dedicated to the CNC.
There is C. A general-purpose PC is used in machine tools that have hundreds of tools and autoloaders and require complicated sequences and input / output signals, but most machine tools have built-in PCs.
Is enough. In a built-in PC for a lathe or a small machining center, an independent microprocessor for the PC is not prepared, and the PC function can be exerted by utilizing the spare capacity of the CNC microprocessor. In this case, the number of parts for the PC can be extremely small, and a product having excellent reliability and cost can be realized.

Since the PC with the built-in CNC can be built in the locker of the CNC, there is also an advantage that a space for installing the PC on the machine side can be saved. Built-in PC and C
Data exchange with the NC does not require a special driver / receiver and requires a common bus (or equivalent), so the number of I / O points required for a PC is about half that of a general-purpose PC. Mu.

Various settings (timers, counters, etc.) regarding the PC, status display, alarm message display, etc.
It can be performed using the operation panel of the CNC and does not require any other operation panel. Figure 17 shows a built-in PC dedicated to NC
FIG. 3 is a schematic view of a CNC machine tool using a CNC with an arrow, in which 10 is a CNC section and 20 is a machine tool section.
The CNC unit 10 is composed of an NC unit 1, a programmable controller (PC) unit 2, and an input / output circuit 3.
The NC unit 1 includes a man-machine control unit 4 that controls a man-machine interface between an operator 110 and a CNC machine tool shown in FIG. 21, an auxiliary command control unit 5 that controls auxiliary commands such as M commands, S commands, and T commands. It is composed of an axis movement control unit 6 that controls the servo axis.

The PC section 2 is a section for storing a sequence program, which is a sequence control device having a structure similar to that of a computer (not shown), and is composed of a CPU, a program storage device, etc., and mainly ROM, RAM.
It is composed of a semiconductor memory. The input / output circuit 3 is an interface portion with the machine side and is composed of a driver and a receiver, and is connected to the machine operation panel 12 of the machine tool unit 20, the high-voltage circuit 13, the spindle amplifier 15, and the like.

The machine tool section 20 includes an operator 110 and an NC operation panel 11 which is the center of the man-machine interface of the CNC machine tool, and is usually composed of a CRT device or a numeric keypad. The data of the NC unit 1 is stored on the CRT device. To be displayed or to input data with the numeric keypad.

In addition, twelve machine operation panels are mainly used for the operator 110 to manually operate the machine tool, thirteen high-voltage circuits control actuators and the like of the machine parts 14, and fifteen spindle amplifiers. Is for controlling the spindle motor 16, and 17 is a speed control unit for controlling 18 feed motors.

The original work of the machine tool is machining such as cutting and grinding, but there are many auxiliary jobs for performing this machining. For example, attachment / detachment of a workpiece, start / stop of a spindle motor, turning on / off of cutting oil, selection of a tool, and the like. These auxiliary jobs are processed by the PC unit 2 in response to the auxiliary function signal (M command), tool selection signal (T command), etc. sent from the NC unit 1.

FIG. 18 is an explanatory diagram of the interface of the auxiliary function signal, and the BCD two-digit code signal (M11 to M).
28) and the code reading signal (MF) from the NC unit 1 to P
The code signal is sent to the C section 2, the code signal is decoded by the PC section 2, the necessary actuator is driven in a predetermined sequence, and the instructed operation is performed.

When the operation is completed, the completion signal (FIN) becomes N
It is sent to C section 1. Thereby, the NC unit 1 turns off the code reading signal MF. Continue to complete signal FIN
After the order of OFF and M code signal OFF, the operation proceeds to the NC command of the next block. A time chart of this operation is shown in FIG.

FIG. 20 is a diagram showing a flow from creation of a machining program to inspection of a workpiece. Processing drawing 100
The programmer 101 creates an NC machining program while watching (step 102). The processing program is created by a normal EIA format, an automatic program mounted on a CNC which has been widely used in recent years, or an off-line CAM. Reference numeral 103 is the NC machining program created in this way.

When the creation of the machining program is completed, the machining program 103 is checked (step 10).
4). This can be done by displaying the path of the machining path on the screen, etc., because many recent CNCs can display graphics. If the machining program 103 is considered to be correct, the machine tool is moved without actually machining, and the blanking is performed to check the machining program while confirming the operation of the machine tool (step 105). If it seems that the workpiece can be cut correctly, trial machining is performed on an actual work (step 106).
If it can be cut correctly, a full-scale cutting process is started (step 107), and the workpiece is inspected if necessary (step 108). If a defect in the machining program is found in each of steps 104 to 108,
The machining program 103 is modified (step 109), and the steps 104 to 108 are checked again from the necessary stage. In the steps 105, 106 and 107 described above, it may be necessary for the operator 110 to temporarily suspend the execution of the machining program and perform the manual operation.

For example, there is a case where the cutting chips are entangled during cutting and it is necessary for the operator 110 to manually remove the cutting chips, or a case where the tool is cut off in the middle and needs to be replaced.

FIG. 21 shows the NC unit 1 when the execution of the machining program is interrupted and interrupted by a manual operation or the like.
3 is a diagram showing an internal state of the machine tool unit 20. FIG. The NC unit 1 analyzes the NC machining program 103 (step 111) and outputs various commands to the machine. In response to this, the machine tool 20 performs a predetermined operation (step 11).
4). At this time, the state A in the NC section 1 and the machine tool section 2
It matches the state A of 0. The matching of the states in this case means that the state of the machine tool unit 20 recognized by the NC unit and the actual state of the machine tool unit 20 match.
For example, when the NC unit 1 recognizes that the machine tool unit 20 is currently equipped with the No. 7 tool, the machine tool unit 20 is actually equipped with the No. 7 tool. Furthermore, the position of each axis of the machine tool recognized by the NC unit 1 and the position of each axis of the actual machine tool are the same.

Normally, as described above, while the machining program is being executed, the machining is executed based on the machining program 103 while the two states are the same. However, this execution is interrupted (step 112), and the operator 110 manually operates the machine. When the machine is operated (step 113), NC state B at the time of interruption, state B of the machine tool and NC after performing an interrupt operation
The state C and the state C of the machine tool are different from each other.

FIG. 22 is an explanatory diagram showing the above example. It is assumed that the M08 command is issued while the machining program is being executed (107). Since the M08 command is a liquid coolant ON command, the liquid coolant is ON on the machine tool side.
It becomes a state. This liquid coolant is coolant OFF
It remains in the ON state until (M09 command) is commanded. If you interrupt the machining program (1
12), the execution of the machining program is interrupted, but the liquid coolant on the machine tool side remains ON. When the operator 110 operates, it is difficult to operate if the coolant is still ON. Therefore, the operator tries to turn off the coolant by commanding M09 by manual operation (MDI).
The machine tool receives this M09 command and turns off the coolant.
Set to FF state. After that, when the machining program is restarted (118), the machine tool side restarts the machining in the coolant OFF state as it is, and restarts in the state at the time of interruption, that is, the state different from the liquid coolant ON state. Will be done.

The above example relates to an auxiliary command, but in addition to this, if the tool cannot be operated unless the tool is moved from the tool position at the time of interruption, if the tool is moved, naturally the interruption (112) occurs. The tool position and the tool position after the interrupt operation (113) are different.

FIG. 23 shows the interrupted NC machining program 10.
It is explanatory drawing in the case of restarting 3. If the NC machining program is temporarily interrupted and the interrupt operation 113 is performed, a state different from the state at the time of interruption will be obtained. If the NC machining program 103 is restarted as it is, normal machining cannot be performed. Therefore, the restore operation 1 required to restart
You need to do 17. The restoration operation means returning the position of the machine at the time of interruption, or returning to the machine state at the time of interruption (spindle speed, coolant ON / OFF, etc.).

When interrupting the machining program,
It is good to suspend the machining program in a temporarily stopped state such as feed hold or block stop and restart it from this state, but if the machining program is completely stopped by resetting the CNC etc. ,
When the execution is restarted, it is necessary to perform the machining program by using a function such as a program search for finding only the position of the machining program, or a modal search for finding the position of the machining program while updating the internal state of the CNC.

FIG. 24 is an explanatory view showing an example of a tool changer (ATC). Reference numeral 30 denotes an ATC unit, which stores a plurality of tools 35 and 36 for tool exchange. 32 is an arm for tool exchange, and is a hand 3 for grasping the tool.
3 are attached to both ends. Reference numeral 31 is a spindle portion, and a machining tool 34 is attached to the tip thereof, and machining is performed by this tool 34. When exchanging tools, first, the exchanging tool is moved to the tool exchanging position of the ATC unit 30, and then the machining tool 34 is moved to the exchanging tool position. This is the position where the tool changing arm 32 can change the tool, and is a fixed position determined by the machine.
When the machining tool 34 and the replacement tool 35 reach the predetermined positions, the tool replacement auxiliary command (M06) is executed.

FIG. 25 is a flowchart showing the correspondence between a series of machine operations in M06 (tool exchange) and auxiliary commands (M commands) corresponding to each machine operation. When M06 is executed, the tool exchange is completed by the series of operations shown in FIG. Although it is sufficient to specify M06 when performing the tool exchange, there is a case where some failure occurs during the tool exchange operation designated by M06 and the tool exchange operation cannot be continued.
In this case, since it is necessary for the operator 110 to intervene, remove the obstacle, and complete the tool replacement, it is normal to be able to specify each of a series of operations for tool replacement by an auxiliary command (M command). is there. That is, an operation equivalent to designating M06 can be performed by sequentially instructing M601 to M612.

It is assumed that the ATC arm interferes with a workpiece or the like and becomes unrotatable during the "arm 180 ° swivel" operation corresponding to M606 in FIG. in this case,
Since the NC machine tool cannot continue machining, an operator must intervene to eliminate the cause of the problem. This is because after stopping the execution of the program, the cause of the problem is removed by manual operation, etc., and the tool change operation (M06) has ended halfway. It recognizes that it stopped during "turning", and commands a series of subsequent tool change operations M606 to M61.
The M06 process was completed by executing 2 commands by manual operation (MDI).

[0024]

Since the conventional numerically controlled machine tool is constructed as described above, after interrupting the machining program 103 for some reason, interrupt processing is performed to restart the machining program 103. Has
There is a first problem that it is necessary for the operator 110 to return from the current state to the state at the time of interruption, which is very time-consuming, and there is a risk of damaging the machine if the machining is restarted without properly restoring the state. .

In order to facilitate the restart processing of the machining program, when the operator 110 manually moves the tool position or the tool at the time of interrupting the machining, the midway route is stored, and this route is stored when restarted. An invention that attempts to return to the interrupted position by tracing the path on the way in reverse is disclosed in JP-A-55-97606.

Further, there is an invention in which the state of the CNC at the time of interruption is stored, and when it is restarted, the stored state of the CNC is restored to resume the machining. JP-A-57-60488 and JP-A-2-151909 Is disclosed in.

However, both of the above two inventions store the internal state of the CNC at the time of interruption and simply restore it at the time of resumption, and no consideration is given to the machine state at the time of resumption. Further, in all of the above three inventions, there is a restriction on the operation before the machining is restarted after the interruption when the machining is restarted. For example, JP-A-5
In the invention disclosed in Japanese Patent Laid-Open No. 5-97606, it is always possible to return to the interrupted position, and if the power of the CNC is turned off, the stored data becomes invalid.

Further, in both the invention disclosed in Japanese Patent Laid-Open No. 57-60488 and the invention disclosed in Japanese Patent Laid-Open No. 2-151909, only interrupt programs programmed in advance can be interrupted when machining is interrupted. Therefore, the operator 110 cannot arbitrarily perform the interrupt operation.

Regarding the auxiliary commands such as the M command and the like, in consideration of the resumption, as disclosed in Japanese Utility Model Laid-Open No. 57-78407, the auxiliary commands executed up to that time are stored in order and restarted. Sometimes, displaying these data on the screen assists the operator 110 in performing the restart process.

Further, as disclosed in Japanese Patent Laid-Open No. 63-74031, auxiliary commands are grouped into groups, and the final commanded auxiliary command in each group is displayed so that the operator 110 can perform restart processing. There are some that help you create your own program.

Further, as disclosed in Japanese Patent Application Laid-Open No. 2-300801, the auxiliary commands are grouped, and the final auxiliary command in each group is automatically executed and restarted during the restart processing. There is also.

However, all of the above three inventions only update the data during the search or execution of the machining program, and the auxiliary command state of the CNC at the time of interruption can be grasped, but the state of the machine tool at the time of restarting. Can't figure out.

The second problem is that it is difficult to grasp the state of the machine with the cover of the machine closed because the actual state of the machine cannot be known without looking at the actual machine. there were.

Further, when a complicated machining program having a structure having multiple nesting is executed and the machining program is interrupted when the subprogram is executed, it is difficult to determine at which position of the machining program the machining is interrupted. It was Therefore, it takes time and labor to specify the program position where the machining should be restarted, and the operator 110
There was a third problem of burdening

In order to solve this problem, Japanese Unexamined Patent Publication No. 62-62
Japanese Patent No. 32505 or Japanese Patent Laid-Open No. 114302/1990 discloses a technique of displaying the execution position of a machining program having a nesting structure. This Japanese Patent Laid-Open No. 62-3
The 2505 publication also discloses displaying the number of times the subprogram is specified and the number of times the subprogram is being executed.

However, in the above two inventions, the execution position of the machining program can be recognized, but the recognized position of the machining program cannot be designated. It was impossible to specify the position when the program was interrupted during execution. This is because the conventional method for specifying the position of the machining program cannot specify the position on the main program side that called the sub program, the number of times the executed program has been repeated, or the like.

In order to solve this problem, JP-A-60-2
In Japanese Patent Laid-Open No. 63209, there is shown a method in which a position in a subprogram and the number of repetitions executed are designated and searched. However, in this method, since the position of the calling side cannot be specified, there is a disadvantage in that when the calling side calls the same subprogram at a plurality of points, the second and subsequent calling positions cannot be searched.

A method is shown in which a position in the program and the number of times of execution are designated and searched. However, with this method, the caller's position cannot be specified, so
If the calling side calls the same subprogram in a plurality of places, there is a disadvantage that the second and subsequent calling positions cannot be searched.

Furthermore, the method disclosed in Japanese Patent Laid-Open No. 60-263209 has a drawback that it takes a long time to search because the sub-program repetitive processing is executed faithfully.

Further, when a series of machine operations such as tool change is commanded by one auxiliary command and a failure occurs in the middle of the series of machine operations, it is difficult to confirm in which operation the failure occurred. Furthermore, there was a fourth problem that the recovery operation was difficult.

The numerically controlled machine tool according to any one of claims 1 to 7 is designed to solve the above first, second, third, and fourth problems, and interrupts the execution of the NC machining program and interrupts it. An object of the present invention is to obtain a numerically controlled machine tool capable of automatically generating a restoration program for performing the processing necessary for restarting the NC machining program when the execution of the NC machining program is resumed after performing the processing.

[0042]

A numerically controlled machine tool according to claim 1 is a numerically controlled machine tool which performs machining based on a machining program, and an interruption means for interrupting a machining program being executed, and a numerical control at the time of interruption. Storage means for storing the state of the machine tool, resuming means for re-executing the machining program from the middle, recognition means for recognizing the state of the numerically controlled machine tool at the time of re-execution, and state of the numerically controlled machine tool at the time of interruption And a generation unit for generating a restart processing program for comparing the states at the time of re-execution and returning to the state of the machine tool at the time of interruption.

A numerically controlled machine tool according to a second aspect is the first aspect.
The numerically controlled machine tool described above is provided with display means for displaying the state of the numerically controlled machine tool at the time of interruption on a screen.

The numerically controlled machine tool of claim 3 is the same as that of claim 1.
The numerically controlled machine tool described above is provided with a correction means for an operator to correct the generated restart processing program.

A numerically controlled machine tool according to a fourth aspect is the second aspect.
The numerically controlled machine tool described above is provided with changing means for changing the state of the numerically controlled machine tool at the time of interruption displayed on the screen by the display means.

A numerically controlled machine tool according to a fifth aspect of the present invention comprises means for setting and storing message data corresponding to each auxiliary command,
The present invention is provided with display means for displaying, as message data, the current state of the numerically controlled machine tool corresponding to the executed auxiliary command.

A numerically controlled machine tool according to a sixth aspect is a numerically controlled machine tool capable of executing a machining program having a nest structure, a monitoring means for monitoring the execution block position of the machining program being executed, and the machining being executed. Display means for displaying the nest structure of the program and correction means for correcting the nest structure of the machining program displayed on the display means are provided.

In the numerically controlled machine tool according to a seventh aspect of the present invention, the entire series of predetermined machine operations can be instructed by one auxiliary command, or each operation of the predetermined series of machine operations can be individually performed. In a numerically controlled machine tool that can be commanded by an auxiliary command, if the operation is interrupted during execution of one auxiliary command that collectively commands the series of machine operations,
And a means for executing the operation after the interrupted operation judged by the judging means by each individual series of auxiliary commands. is there.

[0049]

According to the numerically controlled machine tool according to the first aspect to the seventh aspect, since the restoration program that realizes the restoration processing necessary for re-execution is automatically generated, the operator himself / herself is in a state when the machine is restarted. The machining program can be safely and reliably re-executed without performing the restoration process in consideration of the state at the time of interruption. Further, even if a failure occurs during a series of operations of the machine, the operator can easily continue the remaining operation by removing the failure. In addition, the operator is NC
The comment of the auxiliary command displayed on the screen of the operation unit makes it possible to easily grasp the state of the machine.

[0050]

【Example】

Example 1. A numerically controlled machine tool according to claims 1 to 7 will be described. FIG. 1 is an explanatory diagram showing the first embodiment. When the NC machining program 103 is interrupted (step 112), the state of the NC machine tool at that time is stored (step 121). When the operator performs an interrupt operation (step 113) and then tries to restart the NC machining program (step 118), the NC machine tool state at the time of restart is grasped (step 12).
2) Generate a restoration program by comparing it with the NC state stored in step 121 (step 12
3) When resuming machining (step 118), after executing the restoration program created in step 123 (step 124), the NC state stored in step 121 is restored (step 125), and thereafter the NC machining program 103
The interruption of the NC machining program can be restarted by executing the interruption after the interruption.

FIG. 2 shows the NC machining program 103 of FIG.
5 is an explanatory diagram of a table showing execution positions of FIG. Reference numeral 131 is information indicating the execution position of the machining program, which is usually EIA.
Program number (O
No. ), A sequence number (N No.), and a block number (B), and is information indicating an interruption position corresponding to the automatic program when the automatic program is being executed. Reference numeral 132 is information indicating a position on the main program, and the content of the information is the same as that of 131. Reference numeral 133 is information indicating the number of executions of the main program, which is information indicating the number of times the main program should be originally executed and the number of times the main program has been executed up to now.
For example, when the main program should be executed 100 times, it is executed up to 56 times, and if the 57th is currently being executed, the values of 100 and 56 are stored.

Reference numeral 134 denotes the head position of each subprogram, and the head position is information indicating the head of the subprogram called by the main program. Reference numeral 135 is information indicating the position of the subprogram. If this subprogram is calling another subprogram, it is information indicating the subprogram calling position. If not, the execution position on this subprogram is set. It is information to show. Thirteen
Each of the information items 4 and 135 has the same configuration as that of 131. Similar to 133, 136 executes 25 times where the corresponding subprogram is specified to be repeatedly executed 50 times, and if the 26th time is being executed, 50 and 25 are executed.
It indicates the number of times the subprogram has been specified and the number of times it has been executed so far so that the value of is the stored value.

After that, information on the subprograms corresponding to the nesting times of the subprograms is stored in 134, 135, 136. It is assumed that n indicates the allowable number of nesting times of the subprogram, and the nesting information of the subprogram which is not executed is cleared to zero.

FIG. 5 is an example showing the execution status of the NC machining program 103. Where the main program should be executed A times, it is executed up to a times, the a + 1 time is currently being executed, the sub program 1 is called at the portion P1, the head of the sub program 1 is S1, and the sub program 1 is executed B times. Executed up to b times, and is currently executing the (b + 1) th time. Subprogram 2 is called at P2, subprogram 2 starts at S2, and subprogram 2 executes up to c times where it should be executed C times. , C + 1 times are being executed, subprogram 3 is called at P3, subprogram 3 starts at S3, and subprogram 3 should be executed D times, where d times are currently being executed. It is assumed that the execution position is P4.

In this case, in FIG. 2, the content of 131 is information indicating the position of P4, and the content of 132 is P.
1 is the information indicating the position of 1, the content of 133 is the information indicating A and a, the content of 134 regarding the subprogram 1 is the information indicating the position of S1, and the content of 135 is the position of P2. And the content of 136 is B
And b, which is information about subprogram 1
The contents of 34 are the information indicating the position of S2, the contents of 135 are the information indicating the position of P3, the contents of 136 are the information indicating C and c, and the contents of 134 regarding the subprogram 3. Is information indicating the position of S3, and 1
The content of 35 is information indicating the position of P4, and the content of 136 is information indicating D and d.

FIG. 3 is an explanatory diagram of a table showing other information at the time of execution. 141 is the coordinate value of each axis at that time, 142 is the number of the tool currently used, 1
43 is a correction command value such as a tool position offset value or nose R correction value, 144 is a tool feed speed given by the F command,
145 is the rotation speed of the spindle given by the S command, 146 is G
The modal value of the command, 147, is the state of the M command. 14
The M command state of No. 7 is the M command value 151 being executed by the PC unit 2 as shown in FIG. 4, and the M command being executed is decomposed into a plurality of M command values as described later. The information 152 is information consisting of a portion currently being executed and a final command value 153 in each group of M commands.

Each M command group is a group in which M commands that determine the state of the machine are classified according to the state, and the state of the machine can be grasped by the M command specified in each group. For example, M command indicating the rotation status of the spindle M03: Spindle forward rotation M04: Spindle reverse rotation M05: Spindle stop is one group, and by checking which M command was last issued in this group, the current machine The state can be grasped.

The value of each group of the M command is updated by the execution of the machining program 103 and also by an operation such as a manual operation (MDI). The value of each group of the M command indicates the current machine state. It becomes possible to grasp.

The designation of grouping of the M command can be set on the screen on the NC operation panel 11, as shown in FIG. 16
0 is an example of screen display, 161 is an M command value, and 162 is a group number for grouping. In the example of FIG. 6, an example in which M03: main spindle forward rotation M04: main spindle reverse rotation M05: main spindle stop is designated as the first group, and M07: mist coolant ON M08: liquid coolant ON M09: coolant OFF is designated as the second group Is shown.

Reference numeral 166 is a comment for each M command, and by designating the contents of each M command as a comment, the operator can easily understand the contents of each M command.

FIG. 7 is a flow chart showing a method of updating the value of each group of the M command. When the M command is commanded, it is determined whether or not the commanded M command value is registered (step 1001). That the M command value is registered means whether or not the commanded M command value is registered in the M command value of 161 in the M command table shown in FIG.

If the commanded M command value is registered,
It is determined whether the commanded M command value is designated as a group (step 1002). The fact that the commanded M command value is designated as a group means whether or not the group number is designated at 162 in the M command table shown in FIG. If the commanded M command value is designated as a group, the commanded M command value is stored in the designated group number tables (MG1 to MGn) (step 1003).

As described above, the state of the NC machine tool can be grasped by the data shown in FIGS. 2, 3, and 4. Storing the NC machine tool state shown in step 121 of FIG. 1 means storing the contents of the tables shown in FIGS. 2, 3 and 4 in a dedicated area (not shown). FIG. 8 is a flowchart showing a procedure for restarting the interrupted NC machining program 103. When restarting the NC machining program 103, the NC machine tool state at the time of interruption is displayed on the screen of the NC operation panel 11 (step 110).
1). The NC machine tool state at the time of interruption is the N stored in the dedicated area (not shown) shown in step 121 of FIG.
C Memorized contents of machine tool status.

FIG. 9 is a display example on the screen of the NC operation panel 11. 170 is a display screen, and 171 is NC at the time of interruption.
Information indicating the interruption position of the machining program 103, which is 1
72 is the position information of the main program, 173 is the position information of the sub program 1, 174 is the position information of the sub program 2, 175 is the program number, 176 is the sequence number, 177 is the block number, 178 is the number of repetitions and its execution. It indicates the number of times, 179 is the program number at the beginning of the subprogram, 180 is the same sequence number, and 181 is also the block number.

Each information 171 at the time of interruption shown in FIG. 9 is shown in FIG.
This will be described with reference to FIGS. In the NC machining program example of FIG. 15, it is assumed that the subprogram 1 (SUB1) is stored from the sequence number 5100 and the subprogram 2 (SUB2) is stored from the sequence number 7800 in the program of the program number (PNo.) 100. . Further, FIG. 16 shows the NC machining program PNo. It is a figure which shows the state at the time of 100 interruption. The numerical value of each information 171 at the time of interruption shown in FIG. 9 calls the subprogram 1 10 times at the position of the main program sequence number 2700 and block number 2 in FIG.
The second time is being executed, and subprogram 2 is located at the position of sequence number 5100 and block number 1 of subprogram 1.
Is called five times, the third time is currently being executed, and the sequence number 7835 and block number 3 of the subprogram 2 are currently being executed.

The display example of FIG. 9 indicates that nesting of subprograms is up to double. In the display example of FIG. 9, the nesting of the subprogram can be displayed only up to double, but the screen may be changed according to the allowed nesting. 182 is the coordinate value of each axis at the time of interruption, and in the display example of FIG. 9, X, Y, Z,
Although the coordinate value of the C axis is displayed, the axis to be displayed may also be changed if necessary. Reference numeral 183 indicates a tool (T) used, a correction number (H), a feed rate (F), and a rotation speed (S) of the spindle. Reference numeral 184 indicates a modal value of the G command.

Reference numeral 185 indicates the M command last designated in each group of M commands. Since the M command value 186 and the comment 187 corresponding to each M command value are displayed together for each group, the contents of the M command can be easily determined and the state of the machine can be easily grasped. Is possible. As the content displayed in 187, the comment information specified in 166 of FIG. 6 is displayed.

Returning to FIG. 8, the operator judges whether or not the NC state displayed in step 1101 needs to be corrected (step 1102). If the NC state needs to be corrected, the NC state is corrected (step 1103). . To correct the NC state, move the cursor shown at 188 in FIG. 9 to the correction portion, and press the keyboard (not shown) on the NC operation panel 11.
It can be corrected by inputting data from. The cursor is moved by a cursor movement key (not shown) on the keyboard. 175-177 can be modified
And data indicating each program position of 179 to 181, the number of repetitions of 178 and the number of executions thereof, the coordinate value of each axis indicating the interruption position of 182, the tool (T) of 183
Correction number (H), feed rate (F), spindle speed (S)
, A modal value of the G command of 184, and an M command value of 186 corresponding to each group.

Next, when it is no longer necessary to correct the NC state, the system side compares the state of the NC machine tool displayed in step 1101 with the current state of the NC machine tool to generate a restoration program ( Step 1104).

FIG. 10 is a flow chart showing the restoration program generation. First, the tool number used at the time of interruption is compared with the currently installed tool number (step 1201). If they are the same, it is not necessary to replace the tools, so the process jumps to step 1205.
In 2 to 1204, tool exchange for changing the tool currently installed to the tool used at the time of interruption is performed.

Step 1202 generates a path for moving the currently mounted tool to the tool exchange position, and step 1203 moves the attached tool to the tool exchange position by executing the command generated in step 1202. Therefore, the current machine position is changed to the tool change position. Step 1204 is to generate a command for tool change.

In step 1205, a spindle-related command is generated, and a spindle rotation speed command (S) and a spindle rotation direction command (M03, M04) are generated. Step 1206 outputs an M command necessary for returning the state of the NC machine tool to the state at the time of interruption. This is to set the values of MG1 to MGn shown in FIG. 4 to the same values as at the time of interruption, and if the values at the time of interruption and at the time of restart are different, set the M command value to be the value at interruption. To generate.

Next, the position at the time of interruption and the current position are compared (step 1207), and if they are different, a movement path necessary for returning to the position at the time of interruption is generated (step 1).
208). When returning to the interruption position, instead of directly approaching the interruption position as shown in FIG. 11, it may be approached through a locus of an arc that is in contact with the interruption position (a portion indicated by G02). It is advisable to specify the radius of the arc and the like with parameters. Thus, by approaching with a tangent circle, the tool can be returned without damaging the work piece.

As described above, step 110 in FIG.
The restoration program generated in 4 is displayed on the screen of the NC operation panel 11 (step 1105). FIG. 12 shows an example in which the restoration program thus displayed is displayed.

The operator determines whether or not the restoration program thus generated is to be modified (step 110).
6) If necessary, make a correction (step 110)
7). As shown in FIG. 12, the correction is made by moving the cursor 18 to the correction section.
8 is moved and the same operation as the normal NC machining program 103 is corrected.

The restoration program thus generated is executed at the time of resuming machining (step 1108), then the NC state is restored to the state displayed in step 1101 (step 1109), and the interrupted NC machining program 103 is restored. The execution is restarted (step 1110).

The resuming process of the machining program interrupted by the above procedure is performed. According to the above embodiment,
An example of the machining resuming process after the machining program being executed is interrupted and the operator interrupts is shown. In addition to this, the following procedure enables the execution process from the middle of the machining program. A modal search is performed to the position where you want to execute the program you want to execute from the middle. As a result, the state of the NC machine tool when the machining program is executed up to the interruption position is virtually created.
After that, the processing is performed in the procedure shown in FIG. 8 as in the case where the machining program is interrupted. If the result of the modal search is inconvenient, the state is arbitrarily corrected in step 1103 of FIG.

When performing a modal search in this embodiment, when the area for storing the machine state at the time of interruption is updated and the machining program after the modal search is executed, instead of the area for storing the current machine state, Machining is executed in the same procedure as when the machining is interrupted as described above.

Since the area for storing the machine state at the time of interruption is always present and is not generated only when the machining program is interrupted, the machining program may be interrupted or modal search may be performed. Alternatively, it is possible to directly set data in an area for storing the machine state at the time of interruption and to execute the machining program midway. That is, in the machining program to be executed midway, if the state of the NC machine tool at the time of midway execution is known, the midway execution processing is performed from step 1101 shown in FIG. 8 without performing the modal search as described above. You can go. That is, the state of the NC machine tool at the time of direct execution in step 1103 may be input.

In addition, when the NC machine tool is interrupted, a problem occurs during a series of machine operations, and the series of machine operations cannot be completed and machining is interrupted. There is. For example, this is a case where a problem occurs during the tool changing operation using the ATC as shown in FIG. According to this embodiment, as shown in FIG. 4, when the PC unit 2 is executing the M command value 151 and the M command being executed is decomposed into a plurality of M command values, which will be described later, the part currently being executed. It is possible to easily recognize the interrupted operation because it has the information 152 that indicates. The values of 151 and 152 may be instructed by the PC unit 2 when exchanging data between the NC unit 1 and the PC unit 2, or if the built-in PC has a common value accessible from both sides. Since it often has a table, the data of 151 and 152 may be included in this table.

Further, although each value of 153 in FIG. 4 is normally updated only by the M command, there is a function of operating the NC machine tool from the machine operation panel 12 of the NC machine tool without going through the NC section 1. In this case, if the NC unit 1 monitors only the M command, it becomes difficult to accurately grasp the state of the NC machine tool. In such a case, the PC unit 2 may teach these values in the same manner as the data of 151 and 152.

The information of this MSUB 152 is 18 in FIG.
As indicated by 9, the command value of M and the comment corresponding thereto are simultaneously displayed on the screen as the interruption information, so that the operator can easily confirm the interrupted operation.

FIG. 13 shows a table defining M commands corresponding to a series of machine operations. Data corresponding to this table is preset for each series of machine operations.

FIG. 14 is a flow chart showing the restart processing when a series of mechanical operations are interrupted midway as described above. First, it is checked whether the interrupted M command value has been registered (step 1301). That the interrupted M command value has been registered means that the M command and the comment corresponding to each step of the series of machine operations have been registered as shown in FIG. If registered, the value of n is initialized to 1 in step 1302. The value of n indicates the order of a series of machine operations. MSUB indicated by 152 in FIG.
It is confirmed whether or not the value of is equal to the value of Mn (step 1303). The value of Mn is the value at the specified step of the M command corresponding to the series of machine operations defined in FIG. If they do not match, the value of n is incremented by 1 for comparison with the next data (step 130).
4). At this time, it is confirmed whether the value of n exceeds the number N of steps defined in FIG. 13 (step 1306).
If not exceeded, the process is repeated from step 1303. Figure 1
In the example of 3, the value of N is 12.

Naturally, the value of MSUB is M defined in FIG.
Although it must exist in n, the value of Mn may be erroneously defined in FIG. 13, so this is an error check for this purpose. The value of MSUB is M defined in FIG.
If it does not exist in n, an error occurs (step 13).
06).

If the corresponding Mn value is found, this Mn
Therefore, the value of Mn is output (step 1307). In order to output the remaining M command values that have not been executed, steps 1307 to 1309 are repeated to output data up to the step number N.

Here, the data output of Mn may be performed at the time of creating the restoration program and executed as a part of the restoration program, or it may be predetermined on the NC operation panel 11 or the machine operation panel 12. When the operator presses an operation button (not shown), the series of Mn command values output as described above may be executed to perform the remaining series of mechanical operations.

[0088]

According to the numerically controlled machine tool of the first to seventh aspects, execution of the machining program is interrupted,
After the operator performs an arbitrary interrupt process, when the machining program is re-executed from the interrupted position, a restoration program that compares the machine state at the time of interruption and the machine state at the time of re-execution so that the machine state can be returned to the state at the time of interruption Since it is automatically generated, the operator can perform the resuming process of the machining program without any restriction.

Further, since the state of the NC machine tool at the time of interruption can be displayed, the operator can easily grasp the state of the NC machine tool at the time of interruption,
Furthermore, by making it possible to correct this state from the screen, it is possible to greatly improve the flexibility when restarting.

Further, since the operator can freely modify the automatically generated restoration program, it is possible to perform the optimal restoration processing according to the situation at the time of interruption and at the time of restart.

Further, by classifying the commanded M commands into groups and monitoring the commanded M commands for each group, it becomes possible to recognize the state of the machine, and to correspond to each M command. Since a comment can be added, the operator can easily grasp the machine state.

Furthermore, since the number of times the subprogram is repeated and the number of times the subprogram is executed can be modified, and even the execution position of the program can be modified if necessary, the subprogram of a complicated machining program having a structure with multiple nesting can be modified. It is possible to freely perform control such that the process is executed from the middle, and also from the middle of a plurality of repetitions.

Further, even when the machine stops during the series of machine operations, it is possible to recognize where the machine stopped during the series of machine operations, and the machine can be easily restored after removing the cause of interruption. Became.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a table showing execution positions of an NC machining program.

FIG. 3 is an explanatory diagram of a table showing other information at the time of execution.

FIG. 4 is an explanatory diagram of a table showing states of M commands.

FIG. 5 is a diagram of an example showing an execution status of an NC machining program.

FIG. 6 is a diagram showing an example of a screen display for designating grouping of M commands.

FIG. 7 is a flowchart showing a method of updating the value of each group of M commands.

FIG. 8 is a flowchart showing a procedure for resuming machining after interruption.

FIG. 9 is a diagram showing a display example on the screen of the NC operation panel.

FIG. 10 is a flowchart showing restoration program generation.

FIG. 11 is a diagram showing an example of a tool path for returning a tool to an interruption position.

FIG. 12 is a diagram showing an example in which a restoration program is displayed on the screen.

FIG. 13 is a diagram showing a table defining M commands corresponding to a series of machine operations.

FIG. 14 is a restart processing flowchart during a series of machine operations.

FIG. 15 is a diagram showing a configuration example of a main program and a sub program of the NC machining program.

FIG. 16 is a diagram of an example showing a situation when the NC machining program is interrupted.

FIG. 17 is a schematic diagram of a CNC machine tool using a built-in PC-attached CNC.

FIG. 18 is an explanatory diagram of an interface for auxiliary function signals.

FIG. 19 is a time chart of an M command processing operation.

FIG. 20 is a diagram showing a flow from creation of a machining program to inspection of a workpiece.

FIG. 21 is an explanatory diagram showing internal states of the NC unit and the numerically controlled machine tool.

FIG. 22 is an explanatory diagram showing an example of internal states of the NC unit and the numerically controlled machine tool.

FIG. 23 is an explanatory diagram for restarting the interrupted NC machining program.

FIG. 24 is an explanatory diagram showing an example of a tool changer (ATC).

FIG. 25 is a flowchart showing a series of operations for tool exchange.

[Explanation of symbols]

1 NC section 2 Programmable controller (PC) section 3 Input / output circuit 4 Man-machine control section 5 Auxiliary command control section 6 Axis movement control section 10 CNC section 11 NC operation panel 12 Machine operation panel 13 High-voltage circuit 14 Machine parts 15 Spindle amplifier 16 Spindle motor 17 Speed control unit 18 Feed motor 20 Machine tool section 30 ATC section 31 Spindle section 32 Tool exchange arm 33 Hand for grasping tool 34 Tool for machining 35 Tool exchange tool at tool exchange position 36 Tool exchange Tool 100 Machining drawing 101 Programmer 103 NC machining program 110 Operator 131 Interruption position 132 Main program position 133 Main program execution count 134 Subprogram start position 135 Subprogram position 136 Subprogram execution Number 141 Coordinate value of each axis 142 Number of tool currently used 143 Correction command value such as tool position offset value and nose R correction value 144 Tool feed speed given by F command 145 Spindle rotation given by S command Number 146 G modal value of G command 147 M command state 151 M command value being executed 152 Information indicating the end of M command 153 Final command value in each group of M command 160 Screen display example 161 M command value 162 group Group number to be converted 166 Comment 170 Display screen 171 Information indicating the interrupted position of NC machining program 172 Position information of main program 173 Position information of subprogram 1 174 Position information of subprogram 2 175 Program number 176 Sequence number 177 Block number 178 Repeat Times And its execution count 179 Program number at the beginning of the subprogram 180 Sequence number at the beginning of the subprogram 181 Block number at the beginning of the subprogram 182 Coordinate value of each axis at the time of interruption 183 Tool used, compensation number, feed speed, spindle rotation Number 184 Modal value of G command 185 M command specified last in each group of M command 186 M command value 187 Comment 188 Cursor

Claims (7)

[Claims] 1. In a numerically controlled machine tool that performs machining based on a machining program, interruption means for interrupting the machining program being executed, storage means for storing the state of the numerically controlled machine tool at the time of interruption, and a machining program. Resuming means for re-execution from the middle, recognition means for recognizing the state of the numerically controlled machine tool at the time of re-execution, and comparison of the state of the numerically controlled machine tool at the time of interruption and the state at the time of re-execution A numerically controlled machine tool comprising: a generation unit that generates a restart processing program for returning to a state. 2. The numerically controlled machine tool according to claim 1, further comprising display means for displaying a state of the numerically controlled machine tool at the time of interruption on a screen. 3. The numerically controlled machine tool according to claim 1, further comprising modifying means for modifying the generated restart processing program by an operator. 4. The numerically controlled machine tool according to claim 2, further comprising changing means for changing the state of the numerically controlled machine tool at the time of interruption displayed on the screen by the display means. 5. A means for setting and storing message data corresponding to each auxiliary instruction, and a display means for displaying the current state of the numerically controlled machine tool corresponding to the executed auxiliary instruction as message data. Numerically controlled machine tool. 6. A numerical control machine tool capable of executing a machining program having a nest structure, monitoring means for monitoring the execution block position of the machining program being executed, and a display for displaying the nest structure of the machining program being executed. A numerically controlled machine tool comprising: means and a correction means for correcting the nest structure of the machining program displayed on the display means. 7. The entire series of predetermined machine operations can be commanded by one auxiliary command, or each operation of the predetermined series of machine operations can be commanded by individual auxiliary commands. In a numerically controlled machine tool, when an operation is interrupted during execution of one auxiliary command for collectively instructing the series of machine operations, a determining means for determining which operation is interrupted during the series of machine operations. A numerically controlled machine tool comprising: means for executing an operation after the interruption operation determined by the determination means by a series of individual auxiliary commands.