JP2003022109A - Numerical controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a numerical controller having a numerical control part and a personal computer part, to enable interruption of a processing without generating failures such as bite in a work processing surface when the personal computer falls in an abnormal stop state and to enable automatic restart of the processing at an interrupted position after restart of the personal computer part or the personal computer part and the numerical control part. SOLUTION: In the numerical controller having the numerical control part to perform an interpolation processing according to a prescribed processing program and a personal computer part to provide a personal computer function, it is provided with an abnormal stop detecting means to detect abnormal stop of the personal computer part and to output an interpolation stop instruction and an interpolating means to perform the interpolation processing based on block data to be generated by interpreting the processing program and to decelerate and stop the interpolation processing at the end of a block of the processing program when the interpolation stop instruction from the abnormal stop detecting means is received and the processing is interrupted by decelerating and stopping the interpolation processing at the end of the block when the personal computer is abnormally stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control device having a numerical control section and a personal computer section, which causes a deceleration stop due to an abnormal stop of the personal computer section to interrupt machining and restart the numerical control section and the personal computer section. The present invention relates to a numerical control device capable of restarting machining.

[0002]

2. Description of the Related Art In recent years, realization of a screen display with a large amount of information and high visibility, improvement of user interface operability and customizability (for example, management and operation of machining programs by a graphical user interface), and network compatibility For the purpose of remote management of machines by
Numerical control devices equipped with a personal computer have appeared.

However, in the numerical control device equipped with the personal computer as described above, there is a possibility that the personal computer part may stop abnormally due to a defect in the general-purpose operating system of the personal computer part or an application program operating thereon. is there. In such a state where the personal computer section stops abnormally, the screen display controlled by the personal computer section becomes uncontrollable, making it difficult to grasp the state of the numerical control device. There is a problem that the processing is interrupted by performing an emergency stop process even if the control unit is in a state where the operation can be continued.

In order to solve this problem, for example, as disclosed in Japanese Patent Laid-Open No. 2000-181524, a screen display function is provided not only in the personal computer section of the numerical control apparatus but also in the numerical control section of the numerical control apparatus. When the computer section falls into an abnormal stop state, the video control switch is operated and the screen display from the numerical control section is used to grasp the state of the numerical control device. A device has been proposed.

FIG. 5 is a block diagram showing the configuration of the above-mentioned numerical control device. As shown in FIG. 5, in the numerical control device, the numerical control unit 5 is provided on the real-time operating system of the numerical control hardware 51.
11 on the other hand, on the other hand, on the general-purpose operating system of the personal computer hardware 52, the personal computer section 521
Is configured to operate. In addition, external I / O
The numerical control unit 511 connected to the driving unit 54 is connected to the driving unit 56.
, The servo command value is output. PC part 521
Is an external I / O consisting of a keyboard, network, etc.
It is connected to 55. The numerical control hardware 51 and the personal computer hardware 52 are connected by a bus 53. The numerical controller 511 communicates with the personal computer 521 and detects abnormal stop of the personal computer 521 via the bus 53. Normally, the video changeover switch 57 selects the video signal output from the personal computer section 521 and sends it to the display device 58. On the other hand, when the numerical control section 511 detects an abnormal stop of the personal computer section 521, the video changeover switch 57 is changed over. The switch 57 selects the video signal output from the numerical controller 511 and sends it to the display device 58.

As a method of providing a numerical controller with a personal computer function, as described above, the hardware of the personal computer is added to the numerical controller so that the numerical controller and the personal computer operate on separate hardware. In addition to the configuration shown in FIG. 5, a configuration in which the numerical control unit and the personal computer unit are operated on one piece of hardware can be considered.

For example, FIG. 6A is a block diagram showing an example of a numerical controller having such a configuration. Figure 6
As shown in (a), in the numerical controller,
A real-time operating system and a general-purpose operating system are mounted on the personal computer hardware 61, and the numerical controller 611 is operated on the real-time operating system, while the personal computer 612 is operated on the general-purpose operating system. Is configured.

Further, in order to improve reliability, dedicated hardware compatible with a personal computer may be used as the personal computer hardware 61. Numerical control unit 611 and personal computer unit 6
A communication unit 613 including message communication and a shared memory is provided between the two. The numerical controller 611
The communication unit 613 and a general-purpose operating system monitoring function provided by the real-time operating system detect an abnormal stop of the personal computer unit 612. The display device 62 displays the video signal output from the personal computer section 612. Note that the external I in FIG.
The / O 54, the external I / O 55, and the drive unit 56 have the same functions as the external I / O 54, the external I / O 55, and the drive unit 56 in FIG. 5, respectively.

Further, FIG. 6B is a block diagram showing another example of a numerical control device having a configuration in which the numerical control unit and the personal computer unit are operated on one piece of hardware. As shown in FIG. 6B, in the numerical controller, a general-purpose operating system is mounted on the personal computer hardware 63, and a real-time extension function is added to the general-purpose operating system to improve real-time performance. Configured to secure.

In short, in the numerical controller shown in FIG. 6B, the numerical controller 631 operates in the environment provided by the real-time extension function, and the personal computer 632 operates on a general-purpose operating system. Further, in order to improve reliability, in the numerical control device shown in FIG. 6B as well as the numerical control device shown in FIG. 6A, the computer hardware 63 is compatible with the computer. Dedicated hardware may be used.

Between the numerical control section 631 and the personal computer section 632, a communication means 633 including message communication and shared memory is prepared. The numerical control unit 631 detects an abnormal stop of the personal computer unit 632 by the communication means 633, the general-purpose operating system monitoring function provided by the real-time extension function, and the like. The display device 64 displays the video signal output from the personal computer section 632. Note that FIG.
The external I / O 54, the external I / O 55, and the drive unit 56 in (b) have the same functions as the external I / O 54, the external I / O 55, and the drive unit 56 in FIG. 5, respectively.

[0012]

However, in the above-mentioned prior art, when the numerical control section and the personal computer section are mounted on one piece of hardware, there is only one screen display function for the personal computer section. Therefore, as disclosed in the above-mentioned Japanese Patent Laid-Open No. 2000-181524, the numerical controller cannot have the screen display function. Therefore, there is a problem that the screen display cannot be controlled when the personal computer section abnormally stops.

On the other hand, it is possible to directly control the screen display function of the personal computer section from the real-time operating system or the real-time extension function when the personal computer section is abnormally stopped, but its performance and function are low. However, there is a problem that it is difficult to continue the operation because it is insufficient to grasp the state of the numerical control device.

Further, in the prior art in which an emergency stop is performed when the personal computer section is abnormally stopped, it is highly possible that the machining locus deviates from the program locus due to the interruption of the machining program, resulting in a problem such as biting into the workpiece machining surface. Instead, in the absence of an operator such as during unmanned operation, machining remains suspended, resulting in poor efficiency.

The present invention has been made under the circumstances as described above, and an object of the present invention is a numerical control device having a numerical control section and a personal computer section, in which the personal computer section is in an abnormal stop state. In this case, the machining can be interrupted without causing problems such as cutting into the machining surface of the workpiece,
Another object of the present invention is to provide a numerical control device capable of automatically resuming machining from the interruption position after restarting the personal computer unit and the numerical control unit.

[0016]

SUMMARY OF THE INVENTION The present invention relates to a numerical controller having a numerical control section and a personal computer section, and the above object of the present invention is to provide a numerical control section and a personal computer function for performing interpolation processing in accordance with a predetermined machining program. In a numerical control device having a personal computer section for providing an abnormal stop of the personal computer section, an abnormal stop detecting means for outputting an interpolation stop command, and a block data generated by interpreting the machining program. When the interpolation stop command is received from the abnormal stop detection means, the personal computer part is abnormally stopped with the interpolation means for decelerating and stopping the interpolation processing at the block end point of the machining program. In this case, it is achieved by decelerating and stopping at the end point of the block to interrupt the machining.

Further, the above-mentioned object of the present invention is to confirm the restart control means for instructing the personal computer part to restart after machining interruption due to abnormal stop of the personal computer part, and confirming the restart completion of the personal computer part, And a restart completion confirmation means for instructing the interpolation means to restart the interpolation processing that has been stopped, and after machining interruption due to abnormal stop of the personal computer section,
Resuming block number storage that stores the number of the block next to the block in which the machining was interrupted by restarting the personal computer and restarting the machining from the machining interruption position or by the abnormal stop of the personal computer as the restart block number Means for restarting the numerical control unit and the personal computer unit after storing the restart block number, and the restart block number from the restart block number storage unit after restarting the numerical control unit. Read,
Interpreting means for interpreting the processing program and generating block data from the block of the restart block number;
Reboot completion confirmation means for confirming completion of restart of the personal computer section and for instructing the interpolation means to restart interpolation processing from the block of the restart block number, and interruption of machining due to abnormal stop of the personal computer section This is more effectively achieved by restarting the numerical control unit and the personal computer unit and restarting the machining from the machining interruption position later.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a numerical controller according to the present invention. As shown in FIG. 1, the numerical controller 12 includes a control command calculator 121, an abnormal stop detector 122, a restart controller 123, and a restart completion confirmer 124. Operates on the system or in the environment provided by the real-time extension function. The control command calculator 121 is
It is composed of an interpreter 121a and an interpolator 121b.
The interpretation means 121a reads the machining program 11 and generates block data. Then, the interpolating means 121b outputs a servo command value based on the block data generated by the interpreting means 121a.

On the other hand, the personal computer section 13 operates on a general-purpose operating system. Further, the restart block number storage means 14 stores the restart block number. The servos 15X, 15Y, 15Z drive the servomotors 16X, 16Y, 16Z for each axis based on the servo command value input from the control command calculator 121.

FIG. 2 is a flow chart showing an example of the operation when the personal computer section stops abnormally. As shown in the figure, first, when the personal computer section 13 abnormally stops, the abnormal stop detection means 122 detects this and outputs an interpolation stop command to the interpolation means 121b (step S21). In order to detect an abnormal stop of the personal computer section 13, the abnormal stop detection means 122 uses a method of monitoring a variable that the personal computer section 13 regularly updates or a real-time operating system.
A method using a general-purpose operating system abnormality detection function provided by the system or the real-time extension function can be used.

Next, the interpolation means 121b which has received the interpolation stop command decelerates and stops at the block end point of the machining program 11 and interrupts machining (step S22). In this way, the interpolation means 121b suspends the machining at the block end point, so that it is possible to reduce the influence on the workpiece during cutting and prevent the occurrence of defects such as biting.

Then, the interpolation means 121b outputs the completion of interpolation stop to the restart control means 123 after interrupting the machining, and the restart control means 123 which has received the completion of interpolation stop issues a restart command to the personal computer section 13. The data is output and the personal computer section 13 is restarted (step S23). next,
Completion of restart of the personal computer unit 13 is confirmed (step S
24). When the restart completion of the personal computer unit 13 is confirmed, the restart completion confirming unit 124 outputs the interpolation restart command to the interpolation unit 121b, and the interpolation unit 121b receiving the interpolation restart command interrupts the machining. The processing is restarted from the block after the block (step S25). On the other hand, when the restart completion of the personal computer unit 13 is not confirmed, the restart completion confirming unit 124 does not output the interpolation restart command to the interpolation unit 121b until the restart completion is confirmed.

Now, step S22 of FIG. 2 will be described in more detail with reference to the flowchart of FIG. In short, if at least one of the current block and the next block is a block other than the cutting feed block, it is possible to further reduce the influence on the work. At that time, an example of a procedure of control for interrupting the processing (that is, the processing in step S22) is shown in FIG.

First, it is determined whether the current block is a cutting feed block (step S41). When the current block is a block other than the cutting feed block, the interpolation means 121b completes the execution of the current block and stops (step S42). On the other hand, when the current block is the cutting feed block, it is further determined whether the next block is the cutting feed block (step S43). If the next block is a block other than the cutting feed block, the interpolation means 121b decelerates and stops at the end point of the current block (step S44). On the other hand, when the next block is the cutting feed block, the interpolation means 121b advances the block data by interpolating the current block to make the next block the current block (step S45), and then returns to step S43. In short, the interpolation means 121b is executed by the procedure shown in FIG.
Can always stop the machining at the end point of the cutting operation.

In addition, real-time operating
Depending on the function of the system or the real-time expansion function of a general-purpose operating system that provides the real-time expansion function, it may be necessary to restart the personal computer unit 13.
It may be necessary to restart the numerical controller 12. Figure 3
FIG. 6 is a flowchart showing an example of an operation when the personal computer section abnormally stops in this case. As shown in the figure, first, after step S31, the process proceeds to step S32.
Note that steps S31 and S32 of FIG.
It has the same processing as steps S21 and S22. Therefore, the description of steps S31 and S32 is omitted.

Next, the interpolating means 121b is the block number (restart block number) next to the block whose processing has been interrupted.
Is stored in the restart block number storage means 14 (step S33). The storage contents stored in the restart block number storage means 14 are not changed when the numerical control unit 12 and the personal computer unit 13 are restarted. After that, the restart control means 123 outputs a restart command to the personal computer section 13 to restart the personal computer section 13 (step S34), and also outputs a restart command to the numerical control section 12 to output the numerical control section 12. Is restarted (step S35).

After restarting the numerical control unit 12, the interpreting means 1
21a generates block data from the block of the restart block number read from the restart block number storage means 14 (step S36). Next, it is confirmed that the personal computer unit 13 has been restarted (step S37). When the restart completion of the personal computer unit 13 is confirmed, the restart completion confirming unit 124 outputs the interpolation restart command to the interpolation unit 121b, and then receives the interpolation restart command.
By executing the block data generated by the interpretation unit 121a in step S36, b restarts the processing from the block having the restart block number (step S3).
8). On the other hand, when the restart completion of the personal computer unit 13 is not confirmed, the restart completion confirming unit 124 issues the interpolation restart command to the interpolation unit 121b until the restart completion is confirmed.
Do not output to.

The present invention can be applied whether the numerical control unit 12 and the personal computer unit 13 operate on one piece of hardware or a plurality of pieces of hardware operate in a distributed manner.

[0030]

According to the numerical control apparatus of the present invention, even when the personal computer section is abnormally stopped, the processing can be interrupted safely and without causing any trouble such as cutting into the work surface of the work. At the same time, the personal computer section or the personal computer section and the numerical control section can be restarted to resume machining from the machining interruption position.

In short, according to the numerical control device of the present invention, when the personal computer section is abnormally stopped, the processing is interrupted by decelerating and stopping at the end point of the block so that the personal computer section, or the personal computer section and the numerical control section are stopped. Since it is possible to automatically restart machining from the interrupted position after restarting, the excellent effect of being able to return the numerical control device to the normal state while minimizing the effect of abnormal stop of the personal computer Play.

That is, since the numerical control device according to the present invention can automatically process everything from detection of abnormal stop of the personal computer section to resumption of processing without human intervention, Since it is possible to prevent the occurrence of defective work, the work efficiency is very good.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a numerical controller according to the present invention.

FIG. 2 is a flowchart showing an example of an operation at the time of abnormal stop of a personal computer section.

FIG. 3 is a flowchart showing another example of the operation when the personal computer section abnormally stops.

FIG. 4 is a flowchart showing an example of control for interrupting machining at a block end point when at least one of a current block and a next block is a block other than a cutting feed block.

FIG. 5 is a block diagram showing an example of a conventional numerical control device in which a numerical control unit also has a screen display function.

FIG. 6 is a block diagram showing an example of a numerical control device that operates a numerical control unit and a personal computer unit on one piece of hardware.

[Explanation of symbols]

11 Processing program 12 Numerical control part 121 Control command calculator 121a Interpretation means 121b Interpolation means 122 Abnormal stop detection means 123 Restart control means 124 Reboot completion confirmation means 13 PC department 14 Resuming block number storage means 15X, 15Y, 15Z servo 16X, 16Y, 16Z servo motor 51 Numerical control hardware 511 Numerical control unit 52 PC hardware 521 Personal computer section 53 bus 54,55 External I / O 56 Drive 57 Video selector switch 58 display device 61 PC hardware 611 Numerical control unit 612 PC Department 613 communication means 62 display device 63 PC hardware 631 Numerical control unit 632 PC department 633 Communication means 64 display device

Claims (3)

[Claims] 1. A numerical control device comprising a numerical control unit for performing interpolation processing according to a predetermined machining program and a personal computer unit providing a personal computer function, and outputs an interpolation stop command upon detecting an abnormal stop of the personal computer unit. An abnormal stop detection means and interpolation processing is performed based on block data generated by interpreting the machining program, and when the interpolation stop command from the abnormal stop detection means is received, a block end point of the machining program And an interpolating means for decelerating and stopping the interpolation processing, and when the personal computer section abnormally stops, decelerating and stopping at the block end point to interrupt the machining. 2. A restart control means for instructing restart to the personal computer part after processing interruption due to abnormal stop of the personal computer part, and confirmation of completion of restart of the personal computer part, and stopping for the interpolating means. The restart completion confirming means for instructing the restart of the interpolation processing which has been performed is provided, and after the machining is interrupted due to the abnormal stop of the personal computer, the personal computer is restarted to resume the machining from the machining interrupted position. Numerical control device described. 3. A restart block number storage means for storing, as a restart block number, a block number next to a block of which processing has been interrupted due to an abnormal stop of the personal computer part, and the numerical controller and the personal computer after storing the restart block number. Restart control means for instructing a restart to the part, and after restarting the numerical control part, the restart block number is read from the restart block number storage means, the machining program is interpreted, and the block of the restart block number is read. And an restarting completion confirming means for confirming the restart completion of the personal computer section and for instructing the interpolation means to restart the interpolation processing from the block of the restart block number. Equipped, and restarting the numerical control unit and the personal computer unit after processing interruption due to abnormal stop of the personal computer unit The numerical controller according to claim 1, wherein the machining is restarted from the machining interruption position.