JP2003271213A - Moving axis monitoring device and method therefor, moving axis monitoring program and computer readable recording medium therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a moving axis monitoring device or the like that enables proper maintenance every moving axis of a machine tool. <P>SOLUTION: The moving axis monitoring device is provided with: a cumulative moving distance computing means (21, 22) for computing a moving distance of a vehicle, for every moving axis that moves the vehicle of the machine tool to thereby find the cumulative moving distance for every moving axis; a cumulative moving distance storing means (23) for storing the found cumulative moving distance; and a warning signal output means (26, etc.), for outputting a warning signal when the found cumulative moving distance becomes equal to or more than the limit moving distance (a warning value) that is a limit value of the cumulative moving distance. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving axis monitoring device for monitoring a moving axis that moves a moving body of a machine tool.

[0002]

2. Description of the Related Art Conventionally, maintenance of a moving body of a machine tool, for example, a moving axis (X-axis, Z-axis, etc.) for moving a grindstone table or a table of a grinder is determined by a period of use of the machine tool.
It was done uniformly for all axes of movement. For example, maintenance of the bearings used for the moving shaft is 2 from the start of use.
After the lapse of a year, maintenance of the ball screw was performed after the lapse of 5 years from the start of use. That is, when the usage period of the machine tool exceeds the usage period corresponding to each component, the maintenance of the component is performed. Therefore, the maintenance period has been determined assuming that the usage frequency is high.

[0003]

However, the usage of the machine tool varies from user to user. For example, there are various usage modes such as continuous operation and occasional operation. Furthermore, when a system including a plurality of processes is configured by using a plurality of machine tools, the usage mode differs depending on the process handled by the machine tool.

Further, even in a single machine tool, the use mode differs depending on the moving axis. Further, for example, a cam grinder often uses a specific range of one moving axis (X axis).

As described above, although the use mode is different for each machine tool and for each moving axis, the moving axis is conventionally uniformly maintained. Therefore, some parts are excessively maintained.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a moving axis monitoring device and the like capable of performing appropriate maintenance for each moving axis of a machine tool.

[0007]

Therefore, the present inventor has diligently studied to solve this problem, and as a result of repeated trial and error,
The present invention has been completed based on the idea of monitoring the moving distance of the moving body of the machine tool for each moving axis.

(Moving Axis Monitoring Device) That is, the moving axis monitoring device of the present invention is characterized by having a cumulative moving distance calculating means, a cumulative moving distance storing means, and a warning signal outputting means.

Here, the cumulative moving distance calculating means is a means for calculating the moving distance of the moving body for each moving axis for moving the moving body of the machine tool and obtaining the cumulative moving distance for each moving axis. The movement distance is accumulated by adding the movement distance further moved to the movement distance stored in the accumulated movement distance storage means. The moving distance of the moving body can be accumulated by directly detecting the moving distance by a linear scale or the like, and indirectly by detecting the rotation number of the ball screw of the moving shaft and converting it to the moving distance. Can also be accumulated. Also,
Numerical control In the case of a numerical control device that controls a machine tool,
It is also possible to calculate and accumulate the moving distance based on the command value to each moving axis. The cumulative moving distance storage means is means for storing the cumulative moving distance obtained by the cumulative moving distance calculating means. The warning signal output means is means for outputting a warning signal when the calculated cumulative movement distance is equal to or greater than the limit movement distance which is the limit value of the cumulative movement distance. The limit moving distance must be set in advance. Specifically, the limit moving distance is set for each of the parts such as the bearing and the ball screw used for the moving shaft. The warning signal may be any means for displaying a warning message on the operation screen or the like, sounding a warning sound, performing fax transmission, pager transmission, or the like so as to notify the operator or the like. The warning signal identifies which part should be maintained.

That is, a warning is given when the cumulative moving distance of the moving body for each moving axis reaches the limit moving distance. Therefore, if maintenance is performed according to this warning, appropriate maintenance for each part of each moving axis will be performed. It can be carried out.

In the moving axis monitoring device of the present invention, the machine tool to be monitored is a machine controlled by a numerical control device that executes an NC program, and the cumulative moving distance calculating means is an NC program moving distance calculating means. And an NC program moving distance storage means and an NC program cumulative moving distance calculating means.

Here, the NC program moving distance calculating means is means for calculating the moving distance of the moving body for each moving axis when the NC program is executed based on the NC program. That is, by analyzing the NC program without starting the machine tool, the moving distance of the moving body for each moving axis when the NC program is executed by the machine tool is calculated. This calculation can also be performed in the numerical control device, and can be performed in the programmable logic controller (hereinafter referred to as “PLC”) and also in another external device (personal computer or the like). N
The C program movement distance storage means is means for storing the calculated movement distance in association with the NC program. This is the moving distance calculated for each NC program.
It is stored in association with the C program and each moving axis. The NC program cumulative movement distance calculation means is a means for obtaining the cumulative movement distance for each movement axis by referring to the movement distance stored in the NC program movement distance storage means based on the execution status of the NC program. For example, it is calculated for each moving axis based on a machining start signal or a machining end signal output from a numerical control device or a PLC mounted on a machine tool. This calculation can be performed in the numerical control device, and can be performed in the PLC and also in another external device (personal computer or the like).

That is, each time the numerical control device executes the NC program, the stored movement distances of the respective movement axes can be accumulated. Then, when the movement distance reaches the limit movement distance, a warning is given. Therefore, if maintenance is performed according to this warning, appropriate maintenance can be performed for each part for each movement axis. Further, by calculating the moving distance in this way, it can be calculated by a device (PLC, personal computer, etc.) different from the numerical control device, so that a new numerical control device can be installed even for machine tools already delivered. Appropriate maintenance is possible without mounting.

Further, the moving axis monitoring apparatus of the present invention further outputs a forecast signal for urging maintenance when the calculated cumulative moving distance is equal to or higher than the set forecast value lower than the limit value. You may make it have a signal output means.

As a result, a forecast signal for urging maintenance is output before the warning signal is output, so that the operator can perform maintenance such as parts replacement in advance. As a result, maintenance can be performed without lowering the workability of the machine tool.

Further, the cumulative moving distance calculating means in the moving axis monitoring apparatus of the present invention monitors the situation where the moving body has passed the passing point set at the predetermined position of the moving axis, and moves based on this monitoring result. The cumulative movement distance of the body may be obtained.

Further, the cumulative moving distance calculating means in the moving axis monitoring device of the present invention calculates the moving distance of the moving body within a predetermined monitoring range of the moving axis, and obtains the cumulative moving distance of the moving body within the monitoring range. The warning signal output means may output the warning signal when the calculated cumulative movement distance is equal to or larger than the section limit value of the cumulative movement distance in the predetermined monitoring range.

For example, when frequently moving in a part of the moving shaft such as a cam grinder, even if the frequently moving part should be maintained, the moving distance of the entire moving shaft moves. The limit movement distance of the entire axis may not be reached. In such a situation, it is not enough to monitor the moving distance of the moving body on the entire moving axis.
Therefore, only a part of the moving axis is monitored. That is, when the cumulative movement distance of the monitoring range reaches the section limit value of the cumulative movement distance in the monitoring range, a warning is given, so that appropriate maintenance can be performed.

Further, the moving axis monitoring device of the present invention further provides a forecast signal for urging maintenance when the obtained cumulative moving distance is equal to or greater than the section forecast value set lower than the section limit value. You may make it have a forecast signal output means to output.

As a result, the forecast signal for urging maintenance is output for each monitoring range before the warning signal is output, so that the worker can perform maintenance such as parts replacement in advance. As a result, maintenance can be performed without lowering the workability of the machine tool.

(Movement Axis Monitoring Method) Up to now, the case where the present invention is considered as an apparatus has been described, but the present invention is not limited to the apparatus. That is, as long as the same function can be realized, it may be a method for performing movement axis monitoring, a program that causes a computer to function, or a computer-readable recording medium that records the program. It may be.

That is, the moving axis monitoring method of the present invention is characterized by comprising a cumulative moving distance calculating step, a cumulative moving distance storing step, and a warning signal outputting step.

Here, the cumulative moving distance calculating step is a step of calculating the moving distance of the moving body for each moving axis for moving the moving body of the machine tool and obtaining the cumulative moving distance for each moving axis. The cumulative movement distance storing step is a step of storing the obtained cumulative movement distance. The warning signal output step is a step of outputting a warning signal when the calculated cumulative movement distance is equal to or greater than a limit movement distance that is a limit value of the cumulative movement distance.

The other characteristic parts of the moving axis monitoring device can be realized as a moving axis monitoring method by replacing each unit of the moving axis monitoring device with a step.

(Movement Axis Monitoring Program) The movement axis monitoring program of the present invention is characterized by causing a computer to function as a cumulative movement distance calculation means, a cumulative movement distance storage means, and a warning signal output means.

Here, the cumulative moving distance calculating means is a means for calculating the moving distance of the moving body for each moving axis for moving the moving body of the machine tool and obtaining the cumulative moving distance for each moving axis.
The cumulative moving distance storage means is means for storing the calculated cumulative moving distance. The warning signal output means is means for outputting a warning signal when the calculated cumulative movement distance is equal to or greater than the limit movement distance which is the limit value of the cumulative movement distance.

The other characteristic parts of the moving axis monitoring device can be realized as a moving axis monitoring program that causes a computer to function as each means of the moving axis monitoring device.

(Computer-readable recording medium recording moving axis monitoring program) The computer-readable recording medium recording the moving axis monitoring program of the present invention is a cumulative moving distance calculating means and a cumulative moving distance storing means. And causing a computer to function as a warning signal output means.

Here, the cumulative moving distance calculating means is means for calculating the moving distance of the moving body for each moving axis for moving the moving body of the machine tool, and obtaining the cumulative moving distance for each moving axis.
The cumulative moving distance storage means is means for storing the calculated cumulative moving distance. The warning signal output means is means for outputting a warning signal when the calculated cumulative movement distance is equal to or greater than the limit movement distance which is the limit value of the cumulative movement distance.

The other characteristic parts of the moving axis monitoring device can be realized as a computer-readable recording medium in which a moving axis monitoring program for causing a computer to function as each means of the moving axis monitoring device is recorded.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to embodiments.

First, a numerical control grinder will be described as an example of a machine tool. FIG. 1 shows the configuration of a general numerically controlled grinding machine. The numerical control grinder includes a grinder 1, an input unit 2,
The numerical controller 3, the PLC 4, the drive units 5 and 6,
The display control unit 7 and the display unit 8 are included. Further, the numerical controller 3 includes a CPU 9, a memory 10, a pulse generator, and interfaces 11, 12, 13, and 14.

The NC program input from the input unit 2 is
It is input by the CPU 9 via the interface 13. By interpreting the NC program in the CPU 9, the feed amount per unit time of the moving axis (X axis, Z axis) is calculated and output to the pulse generator 11. The pulse generated by the pulse generator 11 is output to the X-axis drive unit 5 and the Z-axis drive unit 6 to control the motors of the respective moving axes that move the moving body (grindstone table, table) of the grinding machine 1. It In addition, commands such as tool exchange in the NC program are output to the PLC 4 via the interface 15 and controlled. The display unit 8 can display the state of the grinder, the NC program, and the like via the interface 12 and the display control unit 7. Memory (RAM, R
The OM) 10 stores an NC program and various parameters. Further, the output signal of the detector attached to the motor is input to the CPU via the interface 14.

(First Embodiment) FIG. 2 shows the arrangement of a moving axis monitoring device according to the present invention. As shown in FIG. 2, the movement axis monitoring device includes an input unit 2, a movement distance calculation unit 21,
Cumulative moving distance calculation unit 22 and cumulative moving distance storage unit 23
A forecast value / warning value storage unit 24, a determination unit 25, a forecast warning signal output unit 26, a display unit 8, and a warning sound generating unit 27.
And a communication unit 28. The moving distance calculation unit 2
1, the cumulative movement distance calculation unit 22 and the determination unit 25 are as shown in FIG.
It is in the CPU of the numerical control unit 3 shown in FIG. The cumulative moving distance storage unit 23 and the forecast value / warning value storage unit 24 are in the memory 10 of the numerical control unit 3 shown in FIG. Further, the cumulative moving distance calculating means in the present invention is the moving distance calculating unit 21 and the cumulative moving distance calculating unit 22. The cumulative movement distance storage means is the cumulative movement distance storage unit 23. The warning signal output unit and the forecast signal output unit are the forecast warning signal output unit 2
6, a display unit 8, a warning sound generation unit 27, and a communication unit 28.

The moving axis monitoring device having such a configuration will be described in detail with reference to the flowcharts of FIGS. 3 to 5 and FIG.

First, FIG. 3 shows a process of starting or ending the monitoring of the moving axes (X axis, Z axis). The forecast value L1 and the warning value L2 are input from the input unit 2 (shown in FIG. 2) and stored in the forecast value / warning value storage unit 24 (shown in FIG. 2) (steps S1 and S2). The warning value L2 is a limit value (limit moving distance) of the cumulative moving distance determined when outputting the warning signal. The forecast value L1 is a value determined when a forecast signal is output, and is a value smaller than the limit travel distance. Specifically, as shown in FIG. 6, the forecast value L1 and the warning value L2 are input for each component (bearing, ball screw, etc.) used in the moving shaft. Then, the monitoring of the moving axis is started, and the moving axis is monitored based on the forecast value L1 and the warning value L2 until the monitoring of the moving axis is completed (steps S3 and S4). Also, the forecast value L1 or the warning value L
When changing 2, the forecast value L1 or the warning value L2 is further input, and the moving axis is monitored based on the changed forecast value or the like (step S5).

Next, FIG. 4 shows the process of monitoring the moving axis. When the monitoring of the moving axis is started (step S3 in FIG. 3), the moving distance calculating unit 21 (shown in FIG. 2), the cumulative moving distance calculating unit 22, and the cumulative moving distance storage unit 23 perform each movement. The cumulative moving distance L obtained by accumulating the moving distances of the moving bodies for each axis is calculated (step S21). The calculation process of the cumulative movement distance L will be described later. Subsequently, the determination unit 2
5 (shown in FIG. 2), when the cumulative movement distance L calculated for each movement axis is equal to or greater than the forecast value L1, the forecast signal is O
The N state is entered and the forecast signal is output (step S2).
2: Y, step S23). The forecast signal is output to the display unit 8 (shown in FIGS. 1 and 2) by the forecast warning signal output unit 26 (shown in FIG. 2) and displayed so that it can be seen which part of which moving axis has reached the forecast value L1. It When the warning sound is output to the warning sound generation unit 27, the warning sound is emitted. When output to the communication unit 28, it is transmitted to the worker by FAX transmission, pager (registered trademark) transmission, or the like. In this way, maintenance of the relevant part is promoted.

Subsequently, when the worker who receives the forecast signal performs maintenance of the relevant part (step S24:
Y), the forecast signal is turned off (step S2)
5). In this case, the cumulative movement distance L relating to the component of the movement axis for which maintenance has been performed is reset, and the movement distances are accumulated again and monitored. If the maintenance is not performed, the determination unit 25
(Shown in FIG. 2), the cumulative movement distance L is the warning value L2.
It is determined whether or not the above (step S26). Warning value L
If it is smaller than 2, the accumulation of the accumulated movement distance L is continued (step S26: N). If the warning value is L2 or more,
The warning signal is turned on and the warning signal is output. The warning signal is output to the display unit 8, the warning sound generating unit 27, and the communication unit 28 by the forecast warning signal output unit 26 (shown in FIG. 2). In this case, it is advisable to perform display or sound different from the case where the forecast signal is output. In this way
Further promote the maintenance of the relevant parts.

In this state, machining is continued until one cycle of the machine tool is completed (step S28), and the machine is stopped when one cycle is completed (step S2).
9).

Subsequently, when the worker who receives this warning signal performs maintenance of the relevant part (step S30:
Y), the warning signal is turned off (step S3)
1). In this case, the cumulative movement distance L relating to the component of the movement axis for which maintenance has been performed is reset, and the movement distances are accumulated again and monitored. Here, the warning signal becomes O during one cycle.
The reason why the machine is not stopped even in the N state is that there is a possibility of damaging the machine body or the workpiece if the machine is stopped during processing.

ON / OFF of the forecast signal and the warning signal
The operation can be performed by the PLC 4 shown in FIG.

Next, the process of calculating the cumulative moving distance L will be described with reference to FIG. First, the cumulative movement distance L is stored as an initial value “0” in the cumulative movement distance storage unit 23 (shown in FIG. 2) (step S32). Then, the moving distance calculating unit 21 (shown in FIG. 2) calculates the moving distance L3 of the moving body for each moving axis (step S33). This calculation is
The moving distance L3 can be directly detected and calculated by a linear scale or the like attached to the moving portion of each moving shaft. Further, it can be indirectly calculated by detecting the number of rotations of the ball screw of the moving shaft and converting it into a moving distance. Further, it can be calculated based on the command value to each moving axis by the NC program interpreted by the CPU 9 (shown in FIG. 2).

Subsequently, the calculated moving distance L3 is added to the cumulative moving distance L (step S34). This cumulative moving distance L is again calculated by the cumulative moving distance storage unit 23 (shown in FIG. 2).
Memorized in. Then, the accumulated moving distance L is calculated by accumulating the moving distance L3 until the parts are maintained (steps S24 and S30 in FIG. 4) (step S3).
5: N). When the parts are maintained based on the forecast signal and the warning signal (steps S24: Y and S30: Y in FIG. 4), the cumulative movement distance L is reset to the initial value “0”, and the cumulative movement distance L is again set. Calculation is performed and monitoring of the moving axis is started (step S35: Y).

The method of calculating the cumulative moving distance L is not limited to the above-exemplified method. For example, a passing point is provided at a predetermined position on the moving axis, and the moving body passes through this passing point, and the cumulative value is accumulated. The moving distance L may be calculated. Less than,
This method will be described with an example.

In FIG. 11A, the double line and the black circles 1 to 15 on the double line represent the moving axis and the passing points set on the moving axis, respectively. The coordinates on the moving axis of each passing point are stored in the memory 10 (shown in FIG. 1).

For example, when the moving body moves as shown by the arrow in FIG. 11A, it can be seen that the moving body has passed the passing points 2 to 12. Since the distance between each passing point is obtained from the coordinates of each passing point, the passing point 2 to the passing point 12
Can be obtained by calculation, and this is accumulated in the accumulated movement distance L as the movement distance L3.

The passing points are not limited to being set at equal intervals, and as illustrated in FIG. 11B, they may be set at relatively narrow intervals in a portion where the moving axis is frequently used. . This can improve the accuracy of the moving distance.

Further, the forecast value L1 and the warning value L2 may be designated by the number of passages at the passage points instead of by the movement distance. For example, the passing point 11 in FIGS.
It can be set so that the forecast signal is turned on after 100,000 passes and the warning signal is turned on after 110,000 passes.

(Second Embodiment) The first embodiment described above is
Although the moving distance of the moving body in the entire moving axis is monitored, the moving distance of the moving body in a predetermined range (monitoring range) of the moving axis may be monitored. For example, the moving axis is 10 mm
Divide into intervals and monitor in the divided range. Specifically, the forecast value L1 and the warning value L2 in the divided range are input from the input unit 2 (shown in FIG. 2) and stored in the forecast value / warning value storage unit 24. Further, the calculation of the moving distance L3 in step S33 of FIG. 5 calculates the moving distance of the moving body for each of the divided ranges. Then, as the cumulative movement distance L, the movement distance of the moving body in each of the divided ranges is accumulated. The determination unit 25 (shown in FIG. 2) determines the accumulated cumulative movement distance L based on the forecast value L1 and the warning value L2 input in advance (steps S22 and S26 in FIG. 4). According to the present embodiment, it is possible to monitor the range when frequently moving in a part of the moving shaft such as a cam grinder, for example.
The partial maintenance state of the ball screw can be detected properly.

The monitoring range is not limited to one provided at regular intervals, and for example, a frequently used portion on the moving axis may be finely set.

Further, as described above, the moving distance of the moving body in the monitoring range may be obtained depending on the situation where the moving body has passed the passing point on the moving axis.

(Third Embodiment) FIG. 7 shows the arrangement of another moving axis monitoring apparatus according to the present invention. The same components as those in FIG. 2 showing the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

The present embodiment is an apparatus other than the numerical control apparatus, such as a PLC or an external apparatus (personal computer or the like), which can monitor the moving axis. That is,
As shown in FIG. 7, the moving axis monitoring device includes an NC program analysis unit 31 and a moving distance storage unit 32 for each NC program.
An NC program detection unit 33, a corresponding movement distance acquisition unit 34, a cumulative movement distance calculation unit 35, a cumulative movement distance storage unit 36, an input unit 37, and a forecast value / warning value storage unit 38.
The judgment unit 39, the forecast warning signal output unit 26, the display unit 8, the warning sound generation unit 27, and the communication unit 28. The NC program moving distance calculating means in the present invention is the NC program analysis unit 31. The NC program movement distance storage means is the movement distance storage unit 32 for each NC program. The NC program cumulative movement distance calculation means is
Corresponding movement distance acquisition unit 34 and cumulative movement distance calculation unit 35
Is.

The moving axis monitoring device having such a configuration will be described in detail with reference to the flow charts of FIGS. 4, 8 and 9 and FIG.

First, FIG. 8 shows a process of starting or ending the monitoring of the moving axes (X axis, Z axis). The NC program is analyzed by the NC program analysis unit 21 (shown in FIG. 7) such as a personal computer, and the moving distance L3 ′ of the moving body for each moving axis is analyzed.
To calculate. As shown in FIG. 10, the calculated moving distance is stored in the moving distance storage unit 32 (shown in FIG. 7) for each NC program.
Are stored for each NC program and each moving axis (step S41). Subsequently, the forecast value L1 and the warning value L2 are input from the input unit 37 (shown in FIG. 7) and stored in the forecast value / warning value storage unit 38 (shown in FIG. 7) (step S4).
2, S43). The forecast value L1 and the warning value L2 are the same as in the first embodiment. Then, the monitoring of the moving axis is started, and the moving axis is monitored based on the forecast value L1 and the warning value L2 until the monitoring of the moving axis is completed (step S4).
4, S45). When the forecast value L1 or the warning value L2 is changed, the forecast value L1 or the warning value L2 is further input, and the moving axis is monitored based on the changed forecast value or the like (step S46).

Next, FIG. 4 shows the process of monitoring the moving axis. This processing is the same as that in the first embodiment, and therefore its explanation is omitted. The forecast value / warning value storage unit 38 and the determination unit 39 have the same functions as the forecast value / warning value storage unit 24 and the determination unit 25 in the first embodiment, respectively.
The only difference is whether or not it exists in the numerical control unit 3. However, the one existing in the numerical control unit 3 can also be used.

Next, the process of calculating the cumulative moving distance L will be described with reference to FIG. The cumulative movement distance L is set to the initial value "0".
Is stored in the cumulative movement distance storage unit 36 (shown in FIG. 7) as (step S51). NC executed by machine tool
The program is detected (step S52). For example, it detects a machining start signal or a machining end signal output from a numerical controller or PLC mounted on a machine tool. The NC program executed or executed based on the signal can be detected. Then, the moving distance L3 ′ of the moving body for each moving axis corresponding to this NC program is set to NC
It is acquired from the program movement distance storage unit 32 (step S53). Then, the acquired moving distance L3 'is added to the cumulative moving distance L (step S54). This cumulative moving distance L is again stored in the cumulative moving distance storage unit 36 (shown in FIG. 7).
Memorized in. Then, the accumulated moving distance L is calculated by accumulating the moving distance L3 ′ until the parts are maintained (steps S24 and S30 in FIG. 4) (step S5).
5: N). When the parts are maintained based on the forecast signal and the warning signal (steps S24: Y and S30: Y in FIG. 4), the cumulative movement distance L is reset to the initial value “0”, and the cumulative movement distance L is again set. Calculation is performed and monitoring of the moving axis is started (step S55: Y).

(Fourth Embodiment) Although the above embodiment has been described as a moving axis monitoring device, the present invention is not limited to the device. That is, as long as the same function can be realized, it may be a method for performing movement axis monitoring, a program that causes a computer to function, or a computer-readable recording medium that records the program. It may be.

[0059]

According to the moving axis monitoring apparatus of the present invention, proper maintenance can be performed for each moving axis of the machine tool. In addition, appropriate maintenance can be performed on a machine tool that has already been delivered without installing a new numerical control device. Further, even when a part of the moving shaft moves frequently, appropriate maintenance can be performed.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a general numerically controlled grinding machine.

FIG. 2 is a block diagram according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing a process of starting or ending monitoring of a moving axis.

FIG. 4 is a flowchart showing a process of monitoring a moving axis.

FIG. 5 is a flowchart showing a process of calculating a cumulative movement distance.

FIG. 6 is a diagram showing a forecast value and a warning value.

FIG. 7 is a block diagram according to the first embodiment of the present invention.

FIG. 8 is a flowchart showing a process of starting or ending monitoring of a moving axis.

FIG. 9 is a flowchart showing a process of calculating a cumulative movement distance.

FIG. 10 is a diagram showing an NC program and moving distances associated with respective moving axes.

FIG. 11 is a diagram showing passing points on a moving axis for monitoring a moving body.

[Explanation of symbols]

2, 37 ... Input unit 3 ... Numerical value control unit 4 ... PLC 8 ... Display unit (warning signal output means) 9 ... CPU 10 ... Memory (RAM, ROM) 21 ... -Movement distance calculation unit (cumulative movement distance calculation means) 22 ... Cumulative movement distance calculation unit (cumulative movement distance calculation means) 23, 36 ... Cumulative movement distance storage unit (cumulative movement distance storage means) 24, 38 .... Forecast value / warning value storage units 25, 39 ... Judgment unit 26 ... Forecast warning signal output unit (warning signal output means, forecast signal output means) 27 ... Warning sound generation unit (warning signal output means) , Forecast signal output means) 28 ... communication unit (warning signal output means, forecast signal output means) 31 ... NC program analysis unit (NC program movement distance calculation means) 32 ... movement distance storage unit for each NC program (N C
Program moving distance storing means) 33 NC program detecting section 34 Corresponding moving distance acquiring section (NC program cumulative moving distance calculating means) 35 Cumulative moving distance calculating section (NC program cumulative moving distance calculating means)

Claims (9)

[Claims] 1. A cumulative moving distance calculating means for calculating a moving distance of the moving body for each moving axis for moving a moving body of a machine tool, and a cumulative moving distance calculating means for calculating a cumulative moving distance for each moving axis. And a warning signal output means for outputting a warning signal when the obtained cumulative movement distance is equal to or greater than a limit movement distance which is a limit value of the cumulative movement distance. Mobile axis monitoring device. 2. The machine tool is a machine controlled by a numerical controller that executes an NC program, wherein the cumulative movement distance calculating means is for each of the moving axes when the NC program is executed based on the NC program. An NC program moving distance calculating means for calculating the moving distance of the moving body, an NC program moving distance storing means for storing the calculated moving distance in association with the NC program, and the NC program based on the execution status of the NC program. 2. The moving axis monitoring device according to claim 1, further comprising: NC program cumulative moving distance calculating means for obtaining a cumulative moving distance for each moving axis with reference to the moving distance stored in the moving distance storing means. 3. A forecast which outputs a forecast signal for urging maintenance, when the calculated moving distance is equal to or greater than a forecast value set lower than the limit value. The moving axis monitoring device according to claim 1 or 2, further comprising a signal output means. 4. The cumulative moving distance calculating means calculates a moving distance of the moving body within a predetermined monitoring range of the moving axis, obtains a cumulative moving distance of the moving body within the monitoring range, and outputs the warning signal. 3. The moving axis monitoring device according to claim 1, wherein the means outputs a warning signal when the obtained cumulative movement distance is equal to or larger than a section limit value of the cumulative movement distance in the predetermined monitoring range. . 5. The movement axis monitoring device further outputs a forecast signal for urging maintenance when the obtained cumulative movement distance is equal to or greater than a section forecast value set lower than the section limit value. 5. The moving axis monitoring device according to claim 4, further comprising a section forecast signal output means for performing the section prediction signal output. 6. The cumulative movement distance calculating means monitors a situation in which the moving body has passed a passing point set at a predetermined position of the moving axis, and based on the monitoring result, the cumulative movement of the moving body. 2. The distance is obtained as claimed in claim 1.
The moving axis monitoring device according to 3, 4, or 5. 7. A cumulative moving distance calculating step for calculating a moving distance of the moving body for each moving axis for moving the moving body of the machine tool, and a cumulative moving distance calculating step for calculating a cumulative moving distance for each moving axis. And a warning signal output step of outputting a warning signal when the obtained cumulative movement distance is equal to or greater than a limit movement distance which is a limit value of the cumulative movement distance. Moving axis monitoring method. 8. A cumulative moving distance calculating means for calculating a moving distance of the moving body for each moving axis for moving the moving body of the machine tool, and a cumulative moving distance calculating means for calculating a cumulative moving distance for each moving axis. And a computer functioning as a warning signal output means for outputting a warning signal when the obtained cumulative movement distance is greater than or equal to a limit movement distance which is a limit value of the cumulative movement distance. A moving axis monitoring program. 9. A cumulative moving distance calculating means for calculating a moving distance of the moving body for each moving axis for moving the moving body of the machine tool, and a cumulative moving distance calculating means for calculating a cumulative moving distance for each moving axis. And a computer functioning as a warning signal output means for outputting a warning signal when the obtained cumulative movement distance is greater than or equal to a limit movement distance which is a limit value of the cumulative movement distance. A computer-readable recording medium in which the moving axis monitoring program is recorded.