JP7157290B2 - Measuring device, measuring method, program - Google Patents

Description

The present invention relates to a processing apparatus, such as an NC (Numerically Controlled) machine tool, which includes a processing unit for processing a workpiece and a processing control unit for controlling the operation of the processing unit according to processing control information. It relates to a technical field for measuring actual machining time, which is the time during which the is actually machining.

For example, in a processing apparatus such as an NC (Numerically Controlled) machine tool, which has a processing unit that processes a workpiece and a processing control unit that controls the operation of the processing unit according to processing control information, the processing unit actually processes the workpiece. It is important to measure the actual machining time, which is the machining time. This is because, by accurately measuring the actual machining time, it is possible to appropriately determine when to replace a tool such as a drill for cutting and the efficiency of machining work.

As for the actual machining time, it is possible to roughly grasp the time based on the above machining control information. Specifically, the machining control period during which the machining control section causes the machining section to perform machining operations on the workpiece in accordance with the machining control information is regarded as the actual machining time.
However, the machining range defined in the machining control information is wider than the actual machining range. For example, if you try to make the position where the machining part starts/ends the machining operation strictly match the actual machining start position (that is, the position where the machining part touches the workpiece) and the machining end position, the intended Since there is a possibility that a non-machining portion will be formed, the coordinate position at which the processing section starts the processing operation is set before the coordinate position at which the processing section contacts the workpiece, and the processing section is made to finish the processing operation. The coordinate position is set after the coordinate position at which the contact state of the machining portion with respect to the workpiece ends, and therefore the machining control period is longer than the actual machining time. Therefore, the method of regarding the machining control period as the actual machining time cannot accurately grasp the actual machining time.

Techniques for measuring the actual machining time include, for example, the techniques disclosed in Patent Documents 1 and 2 below.
Patent Document 1 discloses a contact sensor and a current sensor for the spindle motor, focusing on the fact that the load on the spindle motor, cutting dust, cutting noise, contact between the cutting tool and the workpiece, etc., differ depending on the states of cutting and non-cutting. , an image sensor, a sound sensor, and a vibration sensor.
Further, Patent Document 2 discloses a technique of using a plurality of vibration sensors with different vibration detection frequency bands, determining actual machining when the vibration sensors detect signals at the same time, and measuring the actual machining time. disclosed.

JP-A-11-28640 JP-A-61-159354

Here, regarding Patent Document 1, using a plurality of sensors to measure the actual machining time is advantageous in terms of improving measurement accuracy, but an increase in the number of sensors leads to an increase in cost. On the other hand, if a single sensor is used, the resistance to noise is lowered, leading to a decrease in the measurement accuracy of the actual machining time.
In addition, since the technique disclosed in Patent Document 2 is based on the premise that a plurality of sensors are used, an increase in cost is unavoidable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to improve the measurement accuracy of the actual machining time while reducing the cost.

A measuring apparatus according to the present invention is a processing apparatus having a processing unit that processes a workpiece and a processing control unit that controls the operation of the processing unit according to processing control information. An input unit for inputting a detection signal from a vibration sensor attached to the processing device or the workpiece so as to be able to detect vibrations caused by the processing of the workpiece by the processing unit, and and a period during which the machining control unit causes the machining unit to execute machining operations on the workpiece according to the machining control information, wherein the machining unit is moved at a machining feed rate lower than the rapid feed rate from the retracted position. A machining control period , which is a period of displacement, is specified by communicating with the machining control unit, and only the detection signal within the machining control period is targeted for machining the workpiece based on the detection signal. and a measuring unit for measuring time.

As a result, it is possible to prevent the actual machining time from being measured in response to noise generated in the detection signal from the vibration sensor during a period other than the machining control period, such as the fast-forwarding period of the machining portion. Moreover, it is not necessary to use a plurality of vibration sensors in measuring the actual machining time.

In the measuring device according to the present invention described above, the measuring unit can be configured to measure the time during which the amplitude value of the detection signal exceeds a threshold within the machining control period as the machining time of the workpiece. is.

As a result, it is possible to measure the period during which vibration increases during machining as the actual machining time.

In the measuring device according to the present invention described above, the measuring section can be configured to be able to change the threshold value.

The magnitude of vibration generated during machining can vary depending on the driving mode of the machining unit (for example, the rotational speed of the tool), the type of tool used, the type of material of the workpiece, and the like. By making the threshold variable, it becomes possible to set an appropriate threshold according to these vibration change factors.

In the measuring apparatus according to the present invention described above, the processing unit has a spindle that rotates a tool, and the measuring unit determines the threshold value based on the amplitude value of the detection signal obtained when the spindle is idle. It is possible to configure

In the detection signal, a machining vibration component, which is a vibration component caused by machining, is superimposed on a main shaft rotational vibration component, which is a rotational vibration component of the main shaft. Therefore, the signal amplitude value of the spindle rotation vibration component is obtained from the detection signal during idling, and a value corresponding to the signal amplitude value is determined as the threshold by adding a predetermined margin value to the signal amplitude value.

In the above measuring apparatus according to the present invention, the measuring unit is configured to determine the threshold value based on the amplitude value of the detection signal during the idling period of the spindle when the machining control period is started. is possible.

As a result, in performing real-time measurement using an appropriate threshold value corresponding to the vibration change factor such as the drive mode of the processing unit and the type of tool, calibration is performed to obtain in advance the threshold value corresponding to the vibration change factor. no longer need to do

In the measuring apparatus according to the present invention described above, the measuring section may measure the machining time based on a signal obtained by extracting a component of a specific frequency band from the detection signal.

As a result, it is possible to measure the actual machining time based on the detection signal from which vibration components that are not caused by machining, such as spindle rotation vibration components, are removed.

In the above measuring apparatus according to the present invention, the processing unit has a spindle for rotating a tool, and the measuring unit removes a spindle rotational vibration component, which is a frequency component of rotational vibration of the spindle, from the detection signal. It is possible to adopt a configuration in which the machining time measurement is performed based on the signal.

As a result, the actual machining time is measured based on the detection signal from which the spindle rotation vibration component has been removed.

In the measuring apparatus according to the present invention described above, the measuring section can be configured to change the frequency band of the signal component to be removed from the detection signal according to the rotation speed of the main shaft.

The frequency band of the spindle rotational vibration component changes according to the rotation speed of the spindle. According to the above configuration, it is possible to set an appropriate removal frequency band according to each rotation speed in response to the case where the machining apparatus performs machining by appropriately changing the rotation speed of the spindle.

In the above-described measuring apparatus according to the present invention, the measuring unit adjusts the frequency band of the spindle rotational vibration component for each rotational speed based on the detection signals obtained when the spindle is idled at different rotational speeds. can be configured to learn

As a result, the frequency band of the spindle rotational vibration component for each rotational speed can be obtained based on the actually measured detection signal, and an appropriate removal frequency band can be set according to each rotational speed.

In the measuring apparatus according to the present invention described above, the measuring unit can be configured to perform control to transmit information representing the machining control period and information on the measured machining time to an external device.

This makes it possible for the user using the external device to grasp the relationship between the machining control period and the actual machining time.

In addition, a measuring method according to the present invention provides a processing apparatus having a processing unit that processes a workpiece and a processing control unit that controls the operation of the processing unit according to processing control information. A measurement method for measuring a machining time, comprising: inputting a detection signal from a vibration sensor attached to the machining apparatus or the workpiece so as to be able to detect vibrations caused by machining of the workpiece by the machining unit; A period in which the machining control unit causes the machining unit to execute machining operations on the workpiece according to the machining control information, wherein the machining unit is displaced at a machining feed rate lower than a rapid feed rate from a retracted position. The machining control period is specified by communicating with the machining control unit, and only the detection signal within the machining control period is targeted, and the machining time of the workpiece based on the detection signal It is a measurement method for making measurements.

Such a measuring method can also provide the same effects as the measuring apparatus according to the present invention described above.

Further, a program according to the present invention is a processing apparatus having a processing unit for processing a workpiece and a processing control unit for controlling the operation of the processing unit according to processing control information. A program that causes a computer device that measures time to execute a process, wherein a vibration sensor attached to the processing device or the work piece is capable of detecting vibrations caused by the processing of the work piece by the processing unit. A signal is input, and the machining control unit causes the machining unit to execute machining operation of the workpiece according to the machining control information , wherein A machining control period, which is a period of displacement at a feed rate of , is specified by communicating with the machining control unit, and only the detection signal within the machining control period is targeted, and the subject based on the detection signal A program for causing the computer device to execute a process of measuring the machining time of a workpiece.

Such a program implements the measuring apparatus according to the present invention.

According to the present invention, it is possible to improve the measurement accuracy of the actual machining time while reducing costs.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the structure of the NC machining system provided with the measuring device as embodiment. It is the figure which showed the structural example of the NC machine tool in embodiment. It is a figure showing an example of composition of a sensor device in an embodiment. It is a figure showing an example of composition of measuring device 1 as an embodiment. FIG. 4 is a diagram showing an example of a machining route for a work; FIG. 4 is an explanatory diagram of a measurement method as a first embodiment; 4 is a flow chart showing a specific processing procedure to be executed in order to implement the measurement method as the first embodiment. It is a functional block diagram of the control part with which the measuring device as a second embodiment is provided. FIG. 10 is a flow chart showing a specific processing procedure to be executed in order to implement a measurement method as a second embodiment; FIG. It is the figure which illustrated the frequency-analysis result of the vibration signal obtained at the time of processing. It is a functional block diagram of the control part with which the measuring device as a third embodiment is provided. It is the figure which showed the example of the table which the measuring device as 3rd embodiment produces|generates. FIG. 11 is a flow chart showing a specific processing procedure to be executed at the time of calibration in the third embodiment; FIG. FIG. 11 is a flow chart showing a specific processing procedure to be executed at the time of actual machining in the third embodiment; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments according to the present invention will be described below.
The configuration described below is merely a specific example, and the present invention is not limited to the following configuration.
The description will be given in the following order.

<1. First Embodiment>
[1-1. Configuration of NC machining system]
[1-2. Measurement method as an embodiment]
[1-3. Processing procedure]
<2. Second Embodiment>
<3. Third Embodiment>
<4. Variation>
<5. Program>
<6. Summary of Embodiments>

<1. First Embodiment>
[1-1. Configuration of NC machining system]

FIG. 1 is a diagram for explaining the configuration of an NC (Numerically Control) machining system 100 including a measuring device 1 that is an embodiment of the measuring device according to the present invention.
As illustrated, the NC machine tool system 100 includes a measuring device 1 , a sensor device 2 , an NC machine tool 3 , an intermediate device 4 , a server device 5 , a cloud server 6 and a display terminal 7 .

The NC machine tool 3 controls the operation of a processing unit (processing unit 36 described later) to which a tool for processing is attached according to processing control information as an NC program (NC program 34a described later). to machine the workpiece W.

FIG. 2 is a diagram showing a configuration example of the NC machine tool 3. As shown in FIG.
The NC machine tool 3 includes a spindle rotation drive section 31 , a position adjustment drive section 32 , a control section 33 , a storage section 34 , a communication section 35 and a processing section 36 .
In this example, the NC machine tool 3 is an NC machine tool that processes the workpiece W by cutting, and the processing unit 36 has a main shaft that rotates a cutting tool such as a drill. The processing unit 36 is configured such that a tool can be detachably attached to the spindle.

The spindle rotation drive section 31 is configured to have a motor that rotates the spindle in the processing section 36 .
The position adjustment drive unit 32 is configured with an actuator (for example, a motor or the like) for driving a position adjustment mechanism (not shown) of the NC machine tool 3 . This position adjustment mechanism is a mechanism for changing the positional relationship between the processing section 36 and the work W. As shown in FIG. In this example, the position adjusting mechanism is configured as a mechanism for changing the position of the processing portion 36 in each of the vertical, horizontal, and front-rear directions.
In addition, the position adjusting mechanism is not limited to the configuration that displaces the processing portion 36, and may be configured to displace the work W side. For example, there is a configuration in which a stage on which the work W is placed is displaced.

The control unit 33 includes, for example, a microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and the CPU executes processing according to a program. to control the operation of the NC machine tool 3 .
In particular, the control unit 33 (CPU) performs processing according to the NC program 34a stored in the storage unit 34, which is a non-volatile storage device, for example. 31 and the position adjustment drive unit 32, the rotational motion control of the main shaft in the processing unit 36 and the positional relationship between the processing unit 36 and the workpiece W are adjusted.
The NC program 34a includes coordinate data representing the movement target position of the processing unit 36, data representing the feed speed of the processing unit 36, data designating the rotational speed of the spindle, and the like. The control unit 33 controls the spindle rotation drive unit 31 and the position adjustment drive unit 32 according to the NC program 34a, thereby realizing the machining operation of the workpiece W as intended by the program designer.

The communication unit 35 performs data communication with an external device, particularly with the measuring device 1 in this embodiment, using a predetermined communication method. In this example, the communication unit 35 performs wired communication using a communication method compatible with the Ethernet (registered trademark) standard.
The control unit 33 can transmit and receive data to and from an external device via the communication unit 35 .

In FIG. 1 , the sensor device 2 detects vibration caused by the machining of the workpiece W by the processing unit 36 and transmits a vibration signal, which is a detection signal of the vibration, to the measuring device 1 .

FIG. 3 shows a configuration example of the sensor device 2. As shown, the sensor device 2 includes a vibration sensor 21, a microcomputer 22, and a communication section .
The vibration sensor 21 is a sensor capable of detecting vibration, specifically an acceleration sensor in this example, and detects vibration caused by the machining of the workpiece W by the machining unit 36 . In this example, the vibration sensor 21 is attached to the processing unit 36 so as to detect vibrations generated during processing.
Note that the vibration sensor 21 may be attached to other parts of the NC machine tool 3 such as a stage on which the work W is placed instead of the processing unit 36, or may be attached to the work W itself. It is possible.

The microcomputer 22 includes a CPU, a ROM, a RAM, and the like, and controls the operation of the sensor device 2 by executing processes according to programs stored in the ROM and the like, for example.
A communication unit 23 is connected to the microcomputer 22 . The communication unit 23 is configured to be able to perform data communication with an external device, particularly with the measuring device 1 in this embodiment, according to a predetermined communication method. In this example, the communication unit 23 performs wired communication corresponding to a serial communication standard such as RS-232C.
The microcomputer 22 performs processing for transmitting a detection signal from the vibration sensor 21 to the measuring device 1 via the communication unit 23 in response to a request from the measuring device 1 .

Returning to FIG. 1 , the measuring device 1 measures the processing time of the workpiece W by the processing unit 36 based on the detection signal (vibration signal) of the vibration sensor 21 input from the sensor device 2 .

FIG. 4 shows a configuration example of the measuring device 1. As shown in FIG.
The measuring device 1 includes a control section 11 , a first communication section 12 , a second communication section 13 and a third communication section 14 .
The control unit 11 includes, for example, a microcomputer having a CPU, ROM, RAM, etc., and the CPU controls the operation of the measuring device 1 by executing processing according to a program stored in the ROM or the like. do.
The first communication unit 12 can perform data communication according to a communication method supported by the communication unit 35 in the NC machine tool 3 . Thereby, the control unit 11 can transmit and receive data to and from the control unit 33 in the NC machine tool 3 via the first communication unit 12 .
The second communication unit 13 is capable of performing data communication according to a communication method supported by the communication unit 23 in the sensor device 2 . It is possible to transmit and receive data to and from the computer 22 . In particular, it is possible to acquire the vibration signal obtained by the vibration sensor 21 via the second communication section 13 .
The third communication unit 14 is capable of performing data communication with the intermediate device 4 shown in FIG. 1 using a predetermined communication method. Specifically, the third communication unit 14 of this example is capable of performing wireless communication with the intermediate device 4 according to a predetermined communication standard.

Note that specific processing executed by the control unit 11 in this embodiment will be described later.

In FIG. 1, the intermediate device 4 includes an arithmetic processing unit such as a microcomputer, a communication unit for performing data communication with the measuring device 1, and a communication unit for performing data communication with the server device 5. and functions as a repeater for data to be exchanged between the measuring device 1 and the server device 5 .

The server device 5 performs data communication between an arithmetic processing unit such as a microcomputer, a communication unit for performing data communication with the intermediate device 4, and an external device via a network NT such as the Internet. and a communication unit for performing the processing.
The server device 5 manages data received from the measuring device 1 via the intermediate device 4 (for example, measurement data on actual machining time, etc.). The server device 5 can transmit the data received from the measuring device 1 to the cloud server 6 via the network NT.

The cloud server 6 and the display terminal 7 each include at least an arithmetic processing unit such as a microcomputer and a communication unit for performing data communication with an external device via the network NT.
The display terminal 7 is configured as a device such as a smart phone, a tablet terminal, a personal computer, or the like, which can receive operation input from a user and display visual information to the user.
The cloud server 6 can receive and store measurement data from the measuring device 1 transmitted from the server device 5 via the network NT. Further, the cloud server 6 can transmit the stored data to the display terminal 7 via the network NT in response to a request from the display terminal 7 .

In the NC machine tool system 100 configured as described above, the user performs an operation input on the display terminal 7 to display information that visualizes the measurement data from the measuring device 1 on the screen of the display terminal 7 (or on the display terminal 7). (on the screen of the display connected to ), and the measurement result by the measuring device 1 can be confirmed.

[1-2. Measurement method as an embodiment]

Here, for the NC machine tool 3, it is considered important to measure the actual machining time, which is the time during which the machining unit 36 is actually machining the workpiece W.
Specifically, by appropriately measuring the actual machining time, it is possible to appropriately know when to replace tools (consumables) such as drills for cutting.
Also, if the actual machining time can be grasped, it becomes possible to estimate the efficiency of the machining work.

FIG. 5 schematically shows an example of a route (processing route) followed by the processing unit 36 when cutting the workpiece W. As shown in FIG.
On the NC program 34a, the range from the start point Ps to the end point Pe in the drawing is defined as the machining range. As described above, if the position at which the machining unit 36 starts/finishes the machining operation is to be exactly matched to the position at which the machining unit 36 actually starts/finishes contact with the workpiece W, Since there is a possibility that an unintended non-machined portion may be formed, the machining range defined on the NC program 34a is set wider than the actual machining range (the range in which the workpiece W is actually machined). there is
For confirmation, the entire range of the arrows shown in the figure (the range from the start point Ps to the end point Pe) represents the machining range on the NC program 34a, and the portion indicated by the wavy line is where the workpiece W actually moves. Represents the area to be processed. In other words, the total time required for the processing unit 36 to follow the portion indicated by the dashed line is the time to be obtained as the actual processing time.

Here, in the NC machine tool 3, the period during which the control unit 33 controls the machining unit 36 to perform machining operations according to the NC program 34a is referred to as "machining control period".
In this example, the machining control period means a period during which the main spindle of the machining part 36 is rotated by the spindle rotation drive part 31 and the machining part 36 is displaced by the position adjustment drive part 32 at the feed rate for machining. do.

In the example of FIG. 5, if the machining control period (the period required from the start point Ps to the end point Pe) is regarded as the actual machining time (the time required for machining the wavy line portion), the deviation from the actual machining time is It can be seen that it becomes large and the actual machining time cannot be grasped accurately. Also, if the actual machining time can be properly measured, the work efficiency can be estimated by comparing it with the machining control period. In the example of FIG. 5, the difference between the actual machining time and the machining control period is large (the machining control period is long relative to the actual machining time), and it can be evaluated that the working efficiency is low.

In this embodiment, in order to improve the measurement accuracy of the actual machining time, a measurement method described with reference to FIG. 6 is adopted.
First, as a premise, when processing the workpiece W, the processing unit 36 is first moved from a predetermined retracted position to a processing operation start position represented by a start point Ps at a feed rate as rapid feed. In this example, the main shaft of the processing unit 36 starts rotating at the timing when fast-forwarding starts.
After that, while the main shaft is rotating, the processing unit 36 is moved to a processing operation end position represented by an end point Pe at a processing feed rate that is slower than the rapid feed as a cutting feed, and performs processing (cutting) on the workpiece W. is done. Upon reaching the machining operation end position, the machining part 36 is moved to a predetermined retracted position by rapid feed. The rotation of the spindle may be stopped at a required timing after reaching the machining operation end position.

With respect to the machining of the workpiece W realized by the series of operations of the machining unit 36 as described above, in this embodiment, the actual machining time is basically measured based on the detection signal (vibration signal) of the vibration sensor 21 . Specifically, the actual machining time is measured by determining whether or not the state is the actual machining state based on whether or not the amplitude value of the vibration signal exceeds a predetermined threshold value TH.
However, it should be taken into consideration that noise may be superimposed on the vibration signal, and simply comparing with the threshold value TH may lead to a decrease in measurement accuracy of the actual machining time. For example, the NC machine tool 3 may be subjected to vibration due to some factor during fast traverse (see, for example, the portion indicated by arrow A in the figure), and in that case, the amplitude value of the vibration signal exceeds the threshold TH. There is a possibility that it will be erroneously counted as the actual machining time.

Therefore, in the measuring apparatus 1 of the present embodiment, machining time measurement is performed based on the vibration signal only for the vibration signal within the machining control period. Specifically, the time during which the amplitude value of the vibration signal exceeds the threshold value TH within the machining control period is measured as the actual machining time.
As a result, it is possible to prevent the time during which machining is not actually being performed from being included in the actual machining time in response to noise generated in the vibration signal during a period other than the machining control period, such as the fast-forward period. It is possible to improve the measurement accuracy of the actual machining time.
Further, in order to improve the measurement accuracy of the actual machining time, it is not necessary to use a plurality of vibration sensors 21, and a single vibration sensor 21 can be used.

[1-3. Processing procedure]

Next, with reference to the flowchart of FIG. 7, a specific procedure of processing to be executed by the control unit 11 of the measuring apparatus 1 in order to realize the measuring method as the embodiment described above will be described.
The processing shown in FIG. 7 is executed by the CPU of the control unit 11 based on a program stored in a predetermined storage device such as the ROM of the control unit 11, for example.

First, in step S101, the control unit 11 waits until processing control is started. Specifically, the control unit 11 makes an inquiry about the control status to the control unit 33 of the NC machine tool 3 at a predetermined cycle such as a 0.1 second cycle by communication via the first communication unit 12, and the inquiry As a result, it waits until the control status becomes the machining control start status. As can be understood from the above description, in this example, the start of machining control means the start of control for displacing the machining part 36 at the feed rate for machining by the position adjustment driving part 32 .

When it is determined in step S101 that the processing control is to be started, the control unit 11 proceeds to step S102 and starts comparing the amplitude value of the vibration signal and the threshold value TH.
In subsequent step S103, the control unit 11 determines whether or not the amplitude value exceeds the threshold TH. If the amplitude value exceeds the threshold TH, time counting is started in step S104, and the amplitude value is determined in step S105. It waits until it becomes equal to or less than the threshold TH.
When the amplitude value becomes equal to or less than the threshold value TH, the control unit 11 stops the time count in step S106, and determines whether or not the processing control ends in step S107. That is, as a result of the control status inquiry, it is determined whether or not the control status is the machining control end status. In this example, the end of processing control means the start of control for moving the processing unit 36 to a predetermined retracted position at a moving speed as fast-forwarding by the position adjustment driving unit 32 .

If it is determined in step S107 that the processing control is not finished, the control section 11 returns to step S103. This makes it possible to intermittently measure the actual machining time during the machining control period.

On the other hand, if it is determined in step S107 that the processing control is not finished, the control unit 11 proceeds to step S108 and determines whether or not the processing finish condition is satisfied. The processing termination condition here is predetermined to terminate the actual machining time measurement processing, such as receiving a notification from an external device such as the intermediate device 4 that the actual machining time measurement processing should be terminated. means a given condition
If it is determined that the processing end condition is not satisfied, the control section 11 returns to step S101.
On the other hand, when determining that the processing end condition is satisfied, the control unit 11 ends the series of processing shown in FIG.

In the above description, an example in which the spindle is rotated during the fast-forward period other than the machining control period was given, but the spindle may be rotated only during the machining control period. In this case, the determination of the start of machining control (S101) can be performed as a determination of whether or not the rotation of the spindle has started, and the determination of the end of machining control (S107) can be performed as to whether or not the rotation of the spindle has ended. can also be performed as a judgment of

Here, although explanation by illustration is omitted, the control unit 11 transmits the data of the actual machining time measured by the processing shown in FIG.
Although not illustrated, the control unit 11 also measures the machining control period. Specifically, the period from when it is determined to start the machining control in step S101 to when it is determined to end the machining control in step S107 is measured as the machining control period. In this example, the control unit 11 also transmits the data of the processing control period thus measured to the cloud server 6 via the intermediate device 4 and the server device 5 .
Thereby, the user can use the display terminal 7 to browse the visual information of the actual machining time and the machining control period. Also, by comparing the actual machining time and the machining control period, it is possible to evaluate the efficiency of the machining work. Furthermore, by reviewing the machining route (see FIG. 5) followed by the machining unit 36 during cutting based on the evaluation result of such work efficiency, it is possible to improve the work efficiency.

<2. Second Embodiment>

Next, a second embodiment will be described.
In the second embodiment, the threshold value TH for determining whether or not it is in the actual machining state is made variable.
The magnitude of the vibration that occurs during machining of the workpiece W can vary depending on the driving mode of the machining unit 36 (for example, the rotational speed of the tool, etc.), the type of tool used, the type of material of the workpiece W, and the like. By making the threshold value TH variable, it is possible to set an appropriate threshold value according to these vibration change factors during machining, thereby improving the measurement accuracy of the actual machining time.

In the following, as an example in which the threshold TH is variable, an example in which the threshold TH is determined based on the amplitude value of the vibration signal obtained when the main shaft is idle will be given. Here, the idling state means a state in which the tool rotates the spindle without contacting another object.
Specifically, in this example, the amplitude value of the vibration signal obtained in the idling state is acquired, and a value obtained by adding a predetermined offset value (margin value) to the amplitude value is determined as the threshold value TH.
In the vibration signal, the machining vibration component, which is the vibration component caused by machining, is generated by being superimposed on the spindle rotation vibration component, which is the rotation vibration component of the spindle (the waveform during the fast feed period in FIG. 6 and the waveform during the actual machining time). and). For this reason, the signal amplitude value of the spindle rotational vibration component is obtained from the vibration signal during idling, and a value obtained by adding a predetermined offset value to the signal amplitude value is set as the threshold value TH. It is possible to appropriately detect the superimposed state, that is, the actual machining state.

For confirmation, the method of determining the threshold value TH based on the vibration signal amplitude value in the idling state as described above depends on the rotation speed of the tool and the type of tool used among the above-mentioned vibration change factors. It is a method that can cope with the vibration change caused by this (it is impossible to deal with the vibration change caused by the type of material of the work W).

FIG. 8 is a functional block diagram of a controller 11A included in the measuring device 1 as the second embodiment.
Note that the measuring apparatus 1 according to the second embodiment is the same as the measuring apparatus 1 according to the first embodiment except that a control unit 11A is provided instead of the control unit 11. Explanation by illustration is omitted. Moreover, in FIG. 8, only the functional blocks corresponding to the functions that are characteristic of the second embodiment are extracted and shown among the functions that the control section 11A has.
In the following description, the same reference numerals and the same step numbers are given to the same parts as those already explained, and the explanation thereof is omitted.

As shown in FIG. 8, the control unit 11A has functions as an idle vibration analysis unit F1 and a threshold determination unit F2.
The idling vibration analysis unit F1 analyzes a vibration signal obtained when the spindle is idling, and obtains an amplitude value of the vibration signal in the idling state (hereinafter referred to as "amplitude value a1"). Specifically, the idling vibration analysis unit F1 of this example analyzes the vibration signal during the idling period of the spindle when the machining control period is started, and obtains the amplitude value a1. At this time, the amplitude value a1 is obtained, for example, as an average value of vibration signal amplitude values within a predetermined sampling period.

The threshold determination unit F2 determines a threshold TH based on the amplitude value a1 obtained by the vibration analysis unit F1 during idling. Specifically, in this example, a value obtained by adding a predetermined offset value to the amplitude value a1 is determined as the threshold value TH.

FIG. 9 shows a specific processing procedure that the control unit 11A in the second embodiment should execute for measuring the actual machining time.
The processing shown in FIG. 9 is executed by the CPU in the control section 11A according to a program stored in a predetermined storage device such as a ROM of the control section 11A.

As shown in the figure, the control unit 11A executes vibration analysis processing during idling in step S201 in response to determining to start machining control in step S101. That is, the vibration signal is analyzed by the vibration sensor 21 in response to the start of machining control, and the amplitude value a1 described above is obtained. As a result, the amplitude value of the vibration signal obtained during the idle rotation period of the spindle when the machining control period is started is obtained as the amplitude value a1.

In step S202 following step S201, the control unit 11A executes threshold determination processing. That is, a value obtained by adding a predetermined offset value to the amplitude value a1 obtained in step S201 is determined as the threshold value TH.
Then, the control unit 11A advances the process to step S102 in response to executing the determination process of step S202.
Note that the processing after step S102 is the same as in the case of FIG. 7, so redundant description is avoided.

Here, as a method for determining the threshold value TH based on the amplitude value of the vibration signal obtained in the idling state of the spindle, the vibration signal amplitude value within the idling period of the spindle when the machining control period is started as described above. is not limited to the method using
For example, as calibration, the vibration signal amplitude value when the spindle is idling is obtained for each combination of tool rotation speed (spindle rotation speed) and tool type, and the threshold value TH for each combination is determined in advance. , a table of threshold values TH can be created. In this case, the control unit 11A acquires the threshold TH corresponding to the combination of the rotational speed of the tool and the type of tool from the table, and uses the acquired threshold TH for measuring the actual machining time.

However, when such calibration is performed, the threshold value TH must be calibrated by changing the rotation speed of the spindle each time, replacing the tool, etc., before performing actual machining of the workpiece W. Therefore, the user will be burdened with the work load. As illustrated in FIG. 9, if the method uses the vibration signal amplitude value within the idling period of the spindle when the machining control period is started, it is possible to avoid imposing such a work load on the user for calibration. It will be done.

The threshold TH can also be determined based on the amplitude value of the vibration signal when the work W is actually processed.
In that case, for example, as calibration, the vibration signal amplitude values during actual machining of the workpiece W are obtained for each combination of the rotational speed of the tool, the type of tool, and the type of material of the workpiece W, and It is conceivable to predetermine the threshold TH for each combination and create a threshold TH table. That is, at the time of actual machining of the work W, the control unit 11A refers to the table prepared in advance by calibration in this way, acquires the threshold value TH corresponding to the combination of the vibration change factors, and obtains the threshold value TH. Actual machining time is measured using TH.
As a result, it is possible to set an appropriate threshold value TH according to the vibration change factor including the type of material of the work W, thereby improving the measurement accuracy of the actual machining time.
In this case, the threshold value TH may be a value obtained by subtracting a predetermined offset value from the vibration signal amplitude value during machining, for example.

<3. Third Embodiment>

The third embodiment measures the actual machining time based on the signal obtained by extracting the component of the specific frequency band of the vibration signal.
FIG. 10 illustrates frequency analysis results of vibration signals (acceleration signals in this example) obtained during machining.
In the figure, the frequency band indicated by "B1" is the frequency band of the spindle rotational vibration component, which is the rotational vibration component of the spindle, and the frequency band indicated by "B2" in the figure is the machining vibration component, which is the vibration component caused by machining. is the frequency band of
As described above, in the vibration signal during machining, the spindle rotation vibration component and the machining vibration component have different frequency bands, and it is possible to detect and distinguish between them in the frequency domain.

Here, the spindle rotational vibration component is a component that is not caused by machining, and can be treated as a noise component in measuring the actual machining time. Therefore, in this example, a method of measuring the actual machining time using a signal obtained by removing the spindle rotation vibration component from the vibration signal is adopted.

At this time, the frequency band of the spindle rotational vibration component can change depending on the rotational speed of the spindle. Therefore, in this example, calibration is performed to specify the frequency band of the spindle rotational vibration component for each rotation speed of the spindle.
Specifically, the spindle is idly rotated at different rotational speeds, and frequency analysis of the vibration signal is performed for each idling state at each rotational speed to determine the frequency band of the spindle rotational vibration component.
Here, hereinafter, the frequency band of the spindle rotational vibration component is referred to as "rotational component band B1".

Further, in this example, a table is generated in which the information of the rotational component band B1 thus determined is stored for each rotational speed, and the actual machining time is measured by removing the component of the rotational component band B1 referred to from this table. based on the vibration signal. Specifically, in this example, a BPF (band-pass filter) whose signal extraction band can be changed removes the component of the rotation component band B1 (that is, the spindle rotation vibration component) from the vibration signal.

FIG. 11 is a functional block diagram of a controller 11B included in the measuring device 1 as the third embodiment.
Since the measuring apparatus 1 according to the third embodiment is the same as the measuring apparatus 1 according to the first embodiment except that a control unit 11B is provided instead of the control unit 11, the internal configuration will be explained with illustrations. are omitted.
In addition, in FIG. 11, only the functional blocks corresponding to the functions that are characteristic of the third embodiment are extracted and shown among the functions that the control section 11B has.

The control unit 11B has functions as a calibration processing unit F5 and an extraction signal generation unit F6.
The calibration processing unit F5 comprehensively represents each function for realizing the above-described calibration, and as shown in the figure, includes a rotation operation control unit F51, a frequency analysis unit F52, a rotation component band determination unit F53, and a table generator F54.
The rotational motion control unit F51 instructs the control unit 33 of the NC machine tool 3 to change the rotational speed of the spindle. The frequency analysis unit F52 performs frequency analysis of the vibration signal from the vibration sensor 21 for each rotation state at each rotation speed while the main shaft is rotated at different rotation speeds by the rotation operation control unit F51. In this example, Fourier transform such as FFT (Fast Fourier Transform Analysis) is performed as frequency analysis.
The rotational component band determination unit F53 determines the rotational component band B1 for each rotational speed based on the frequency analysis result of the vibration signal by the frequency analysis unit F52. Various methods are conceivable for determining the rotational component band B1 from the frequency analysis result. For example, a method for determining a band in which the spectral intensity is equal to or greater than a certain value as the rotational component band B1 can be cited.
Based on the information of the rotational component band B1 determined for each rotational speed by the rotational component band determining unit F53, the table generation unit F54 associates and stores the rotational component band B1 for each rotational speed, for example, as shown in FIG. Generate a table. The example of FIG. 12 shows a table storing rotation component bands B1 corresponding to each rotation speed up to 5000 rpm in increments of 500 rpm, but the corresponding upper limit of rotation speed and resolution are limited to 5000 rpm and 500 rpm as examples. not to be

Returning to FIG. 11, the extraction signal generation unit F6 acquires information on the rotational component band B1 corresponding to the rotation speed of the spindle from the table, and generates a signal by extracting components other than the acquired rotational component band B1 from the vibration signal. As shown in the figure, it includes a BPF unit F61, a rotation speed information acquisition unit F62, and an extraction band adjustment unit F63.
The BPF unit F61 performs processing for extracting components of a specific frequency band from the vibration signal input from the sensor device 2 . In this example, the BPF unit F61 is configured to be able to change the frequency band to be extracted (hereinafter also simply referred to as "extraction band").

The rotation speed information acquisition unit F62 communicates with the control unit 33 of the NC machine tool 3 to acquire rotation speed information of the spindle in the processing unit 36 . As the spindle rotation speed information, the rotation speed information at the time of actual machining is acquired.

The extraction band adjustment unit F63 adjusts the extraction band of the BPF unit F61 based on the rotation speed information acquired by the rotation speed information acquisition unit F62. Specifically, from the table generated by the table generation unit F54, the information of the rotation component band B1 corresponding to the rotation speed represented by the obtained rotation speed information is obtained, and the extracted band of the BPF unit F61 is the obtained rotation speed. Adjustments are made so that the frequency band excludes the component band B1.

In the third embodiment, the control unit 11B calculates the actual machining time based on the vibration signal in which the component of the specific band is extracted by the BPF unit F61 whose extraction band is adjusted as described above, as in the case of the first embodiment. Take measurements. That is, the period during which the amplitude value of the vibration signal exceeds a predetermined threshold value TH within the actual machining period is measured as the actual machining time.

13 and 14 are flowcharts showing specific processing procedures to be executed by the control unit 11A in order to realize the measurement method as the third embodiment described above.
FIG. 13 shows a specific processing procedure to be executed in order to realize the function of the calibration processing unit F5 shown in FIG. 11, and FIG. shows a specific processing procedure to be executed corresponding to the processing of .
The processes shown in FIGS. 13 and 14 are executed by the CPU in the control section 11B according to a program stored in a predetermined storage device such as a ROM of the control section 11B.

In FIG. 13, the controller 11B instructs the controller 33 of the NC machine tool 3 to rotate at the initial rotational speed in step S301. That is, in this example, first, an instruction is given to rotate the spindle at a rotation speed of 500 rpm.

In subsequent step S302, the control unit 11B performs frequency analysis of the vibration signal. That is, the vibration signal input from the sensor device 2 is subjected to frequency analysis by FFT. Next, in step S303, the control section 11B determines the rotational component band B1 based on the frequency analysis result.
Furthermore, in subsequent step S304, the control unit 11B performs processing for storing information on the determined band (rotational component band B1).

After executing the storage process in step S304, the control unit 11B determines in step S305 whether or not the process for all rotation speeds has been completed. Specifically, in this example, it is determined whether or not the processing of steps S302 to S304 has been completed for each rotation speed up to 5000 rpm in increments of 500 rpm.
If it is determined that the processing for all rotation speeds has not been completed, the control unit 11B proceeds to step S306 and instructs the control unit 33 to switch the rotation speed. Specifically, an instruction is given to increase the rotation speed of the main shaft by 500 rpm. Then, the process returns to step S302.
As a result, information on the rotation component band B1 for each rotation speed is stored.

On the other hand, if it is determined that the processing for all rotation speeds has been completed, the control unit 11B performs processing for generating a table storing information on the rotation component band B1 for each rotation speed as table generation processing in step S307. A series of processes shown in 13 are completed.

Next, the processing of FIG. 14 will be described.
First, the control unit 11B advances the process to step S401 in response to determining to start processing control in step S101. In step S401, the control unit 11B performs rotation speed information acquisition processing. That is, an inquiry is made to the control unit 33 to acquire information representing the current rotation speed of the spindle (that is, synonymous with the rotation speed during machining).

In step S402 following step S401, the control unit 11B acquires information on the rotational component band B1 from the table. That is, from the table generated in step S307, the information of the rotational component band B1 corresponding to the rotational speed indicated by the rotational speed information obtained in step S401 is obtained.
Note that in the acquisition process of step S402, among the information of the rotation component band B1 associated with each rotation speed (every 500 rpm in this example) in the table, the difference from the rotation speed represented by the rotation speed information acquired in step S401 is associated with the smallest rotational speed.

In response to acquiring the information of the rotational component band B1 in step S402, the control unit 11B executes a BPF filter characteristic setting process in step S403. That is, the filter characteristics are set so that the extraction band of the BPF unit F61 is a frequency band excluding the rotation component band B1 acquired in step S402.

Then, in step S404 following step S403, the control unit 11B starts comparing the amplitude value of the vibration signal after passing through the BPF and the threshold value TH.
As illustrated, after executing the process of step S404, the control unit 11B advances the process to step S103. Since the processing after step S103 is the same as in the case of FIG. 7, redundant description is avoided.

In the above description, when the machining control period starts, an inquiry is made to the control unit 33 to acquire information on the spindle rotation speed during machining (see step S401). The timing of acquiring the information may be at least before the actual machining period. For example, since the NC program 34a stores information designating the spindle rotation speed during machining, the information may be acquired before the machining control period, such as when fast-forwarding to the start point Ps is started. You can get it at any time.

Here, in the above, as an example of extracting a component of a specific frequency band from a vibration signal, an example of extracting a component other than a spindle rotation vibration component was given, but a method of extracting a machining vibration component can also be adopted.
In that case, by calibration, for example, the frequency band of the machining vibration component is specified for each type of material of the workpiece W, and a table representing the correspondence between the type of material and the frequency band is generated, and at the time of actual processing Then, based on the table, a frequency band component corresponding to the type of material of the workpiece W to be processed is extracted from the vibration signal, and the actual processing time is measured based on the extracted signal.
Also, at this time, the amplitude intensity of the machining vibration component may change depending on vibration change factors such as the driving mode of the machining unit 36 such as the rotational speed of the tool, the type of tool used, the type of material of the work W, and the like. . Therefore, it is possible to change the threshold TH according to at least one of these vibration change factors. For example, by calibration, the amplitude intensity of the machining vibration component is specified for each rotation speed, the threshold TH for each rotation speed is determined based on the amplitude intensity of these machining vibration components, and the correspondence relationship between the rotation speed and the threshold TH is determined. Create a table to represent Then, during the actual machining, it is conceivable to obtain a threshold TH corresponding to the rotation speed of the spindle based on the table, and measure the actual machining time based on the obtained threshold TH.
Alternatively, by calibration, the amplitude intensity of the machining vibration component is specified for each type of material of the workpiece W, the threshold value TH for each material type is determined based on the amplitude intensity of these machining vibration components, and the material type and the threshold value are determined. A table representing the correspondence with TH is created. During actual machining, it is conceivable to obtain a threshold TH corresponding to the type of material of the work W based on the table, and measure the actual machining time based on the obtained threshold TH.

<4. Variation>

In the above, an example of measuring the actual machining time in real time was given. The actual machining time may be measured after the fact based on.

Moreover, the configuration shown in FIG. 1 is merely an example, and the measuring device 1 may be integrated with the NC machine tool 3, for example. Further, the sensor device 2 (vibration sensor 21) may be integrally incorporated into the measuring device 1. FIG.

<5. Program>

The measuring device 1 as an embodiment has been described above, and the program according to the embodiment is a program that causes a computer device such as a CPU to execute the processing as the measuring device 1 .

A program according to an embodiment is a computer device for measuring the processing time of a workpiece by the machining unit for a machining apparatus having a machining unit for machining the workpiece and a machining control unit for controlling the operation of the machining unit according to machining control information. A program for executing processing, wherein a detection signal from a vibration sensor attached to a processing device or a work piece capable of detecting vibration caused by processing of the work piece by the processing unit is input, and the processing control unit performs processing Communicating with the machining control unit to specify a machining control period, which is a period during which the machining unit is caused to perform machining operations on the workpiece according to the control information, and targets only the detection signals within the machining control period. It is a program that causes a computer device to execute a process of measuring the machining time of a workpiece based on.
That is, this program corresponds to, for example, a program that causes a computer device to execute the processes described with reference to FIGS.

Such a program can be stored in advance in a computer-readable storage medium such as a ROM, SSD (Solid State Drive), HDD (Hard Disk Drive), or the like. Alternatively, it can be temporarily or permanently stored (stored) in a removable storage medium such as a semiconductor memory, memory card, optical disk, magneto-optical disk, or magnetic disk. Also, such a removable storage medium can be provided as so-called package software.
Such a program can be installed from a removable storage medium to a personal computer or the like, or downloaded from a download site to a required information processing device such as a smartphone via a network such as a LAN (Local Area Network) or the Internet. can also

<6. Summary of Embodiments>

As described above, the measuring apparatus (same 1) as an embodiment includes a processing unit (same 36) that processes a workpiece (workpiece W) and a processing unit that controls the operation of the processing unit according to processing control information (NC program 34a). A measuring device for measuring the processing time of a workpiece by a processing unit for a processing apparatus (NC machine tool 3) having a control unit (control unit 33), wherein the vibration occurs due to the processing of the workpiece by the processing unit. An input unit (second communication unit 13) for inputting a detection signal from a vibration sensor (same 21) attached to a processing device or a workpiece so as to be able to detect the The machining control period, which is the period during which the machining operation of the object is executed, is specified by communicating with the machining control unit, and the machining time of the workpiece based on the detection signal is targeted only for the detection signal within the machining control period. It is provided with a measurement unit (control units 11, 11A, and 11B) that performs measurement.

As a result, it is possible to prevent the actual machining time from being measured in response to noise generated in the detection signal from the vibration sensor during a period other than the machining control period, such as the fast-forwarding period of the machining portion. Moreover, it is not necessary to use a plurality of vibration sensors in measuring the actual machining time.
Therefore, it is possible to improve the measurement accuracy of the actual machining time while reducing the cost.

Further, in the measuring device of the embodiment, the measuring unit measures the time during which the amplitude value of the detection signal exceeds the threshold within the machining control period as the machining time of the workpiece.

As a result, it is possible to measure the period during which vibration increases during machining as the actual machining time.
Therefore, it is possible to appropriately measure the actual machining time.

Furthermore, in the measuring device of the embodiment, the measuring section (control section 11A) is configured to be able to change the threshold value.

The magnitude of vibration generated during machining can vary depending on the driving mode of the machining unit (for example, the rotational speed of the tool), the type of tool used, the type of material of the workpiece, and the like. By making the threshold variable, it becomes possible to set an appropriate threshold according to these vibration change factors.
Therefore, it is possible to improve the measurement accuracy of the actual machining time.

Furthermore, in the measuring device of the embodiment, the processing section has a spindle that rotates the tool, and the measuring section determines the threshold value based on the amplitude value of the detection signal obtained when the spindle is idle.

In the detection signal, a machining vibration component, which is a vibration component caused by machining, is superimposed on a main shaft rotational vibration component, which is a rotational vibration component of the main shaft. Therefore, the signal amplitude value of the spindle rotation vibration component is obtained from the detection signal during idling, and a value corresponding to the signal amplitude value is determined as the threshold by adding a predetermined margin value to the signal amplitude value.
This makes it possible to set an appropriate threshold value based on the actually measured detection signal amplitude value, and improve the measurement accuracy of the actual machining time.

Further, in the measuring device of the embodiment, the measuring unit determines the threshold value based on the amplitude value of the detection signal during the idle rotation period of the spindle when the machining control period is started.

As a result, in performing real-time measurement using an appropriate threshold value corresponding to the vibration change factor such as the driving mode of the processing unit and the type of tool, calibration is performed to obtain in advance the threshold value corresponding to the vibration change factor. no longer need to do
Therefore, the user does not have to bear the burden of performing the threshold calibration, such as changing the rotation speed of the spindle each time or replacing the tool. It is possible to reduce the work burden on the user and improve efficiency by shortening the work time.

Furthermore, in the measuring apparatus of the embodiment, the measuring section (control section 11B) measures the processing time based on the signal obtained by extracting the component of the specific frequency band of the detection signal.

As a result, it is possible to measure the actual machining time based on the detection signal from which vibration components that are not caused by machining, such as spindle rotation vibration components, are removed.
Therefore, it is possible to improve the measurement accuracy of the actual machining time.

Furthermore, in the measuring device of the embodiment, the processing unit has a spindle that rotates the tool, and the measuring unit removes the spindle rotational vibration component, which is the frequency component of the rotational vibration of the spindle, from the detection signal. Machining time is measured.

As a result, the actual machining time is measured based on the detection signal from which the spindle rotation vibration component has been removed.
Therefore, it is possible to improve the measurement accuracy of the actual machining time.

Further, in the measuring device of the embodiment, the measuring section changes the frequency band of the signal component to be removed from the detection signal according to the rotational speed of the main shaft.

The frequency band of the spindle rotational vibration component changes according to the rotation speed of the spindle. According to the above configuration, it is possible to set an appropriate removal frequency band according to each rotation speed in response to the case where the machining apparatus performs machining by appropriately changing the rotation speed of the spindle.
That is, even when the machining apparatus performs machining by appropriately changing the rotation speed of the spindle, it is possible to improve the measurement accuracy of the actual machining time.

Furthermore, in the measuring device of the embodiment, the measuring unit learns the frequency band of the spindle rotational vibration component for each rotational speed based on the detection signals obtained when the spindle is idled at different rotational speeds.

As a result, the frequency band of the spindle rotational vibration component for each rotational speed can be obtained based on the actually measured detection signal, and an appropriate removal frequency band can be set according to each rotational speed.
Therefore, when the machining apparatus performs machining by appropriately changing the rotational speed of the spindle, it is possible to improve the measurement accuracy of the actual machining time.

Furthermore, in the measuring device of the embodiment, the measuring unit controls transmission of information representing the machining control period and information of the measured machining time to the external device.

This makes it possible for the user using the external device to grasp the relationship between the machining control period and the actual machining time.
Therefore, it is possible to provide the user with information that contributes to the evaluation of machining work efficiency, thereby contributing to the improvement of machining work efficiency.

Further, the measurement method of the embodiment measures the processing time of the workpiece by the processing unit in a processing apparatus having a processing unit that processes the workpiece and a processing control unit that controls the operation of the processing unit according to processing control information. In the measurement method, a detection signal is input from a vibration sensor attached to a processing device or a workpiece so as to be able to detect vibration caused by processing of the workpiece by the processing unit, and the processing control unit performs processing according to the processing control information. A machining control period, which is a period during which the machining part is caused to perform machining operations on the workpiece, is specified by communicating with the machining control part, and only the detection signals within the machining control period are targeted, and the object is detected based on the detection signal. This is a measurement method for measuring the machining time of a workpiece.

With such a measuring method, the same actions and effects as those of the measuring device according to the embodiment described above can be obtained.

Further, the program of the embodiment measures the processing time of the workpiece by the processing unit for a processing apparatus having a processing unit that processes the workpiece and a processing control unit that controls the operation of the processing unit according to processing control information. A program for causing a computer device to execute processing, which inputs a detection signal from a vibration sensor attached to a processing device or a workpiece so as to detect vibration caused by processing of the workpiece by the processing unit, and a processing control unit communicates with the machining control unit to specify the machining control period, which is the period during which the machining unit is caused to perform machining operations on the workpiece according to the machining control information, and targets only the detection signal within the machining control period, It is a program that causes a computer device to execute a process of measuring the machining time of the workpiece based on the detection signal.

Such a program can realize the measuring device as the embodiment described above.

1 measuring device, 2 sensor device, 3 NC machine tool, 11, 11A, 11B control unit,
13 second communication unit, 21 vibration sensor, 31 spindle rotation drive unit, 32 position adjustment drive unit, 33 control unit, 34 storage unit, 34a NC program, 36 processing unit, W work (workpiece), Ps start point, Pe end point, F1 idling vibration analysis unit, F2 threshold value determination unit, F5 calibration processing unit, F51 rotation operation control unit, F52 frequency analysis unit, F53 rotation component band determination unit, F54 table generation unit, F6 extraction signal generation unit, F61 BPF (band pass filter) unit, F62 rotation speed information acquisition unit, F63 extraction band adjustment unit

Claims (10)

A measuring device for measuring the processing time of the workpiece by the machining unit, for a machining apparatus having a machining unit for machining the workpiece and a machining control unit for controlling the operation of the machining unit according to machining control information, ,
an input unit for inputting a detection signal from a vibration sensor attached to the processing device or the work piece so as to detect vibration caused by the processing of the work piece by the processing unit;
A period in which the machining control unit causes the machining unit to perform machining operations on the workpiece in accordance with the machining control information, during which the machining unit is displaced at a machining feed rate lower than a rapid feed rate from a retracted position. A machining control period, which is a period, is specified by communicating with the machining control unit, and only the detection signal within the machining control period is targeted, and the machining time of the workpiece based on the detection signal is measured. and a measuring unit that performs
The processing unit has a spindle that rotates the tool,
The measuring unit
The machining time is measured based on a signal obtained by removing the spindle rotational vibration component, which is the frequency component of the rotational vibration of the spindle, from the detection signal. change according to
measuring device. The measuring unit
The measuring device according to claim 1, wherein the time during which the amplitude value of the detection signal exceeds a threshold within the processing control period is measured as the processing time of the workpiece. The measuring unit
The measuring device according to claim 2, wherein the threshold is changeable. The processing unit has a spindle that rotates the tool,
The measuring unit
4. The measuring device according to claim 3, wherein the threshold is determined based on an amplitude value of the detection signal obtained when the spindle is idle. The measuring unit
5. The measuring device according to claim 4, wherein the threshold value is determined based on an amplitude value of the detection signal during an idle rotation period of the spindle when the machining control period is started. The measuring unit
4. The measuring apparatus according to any one of claims 1 to 3, wherein said machining time measurement is performed based on a signal obtained by extracting a component of a specific frequency band of said detection signal. The measuring unit
7. The method according to any one of claims 1 to 6, wherein the frequency band of the main shaft rotational vibration component is learned for each rotational speed based on the detection signals obtained when the main shaft is idled at different rotational speeds. measuring device. The measuring unit
8. The measuring apparatus according to any one of claims 1 to 7 , wherein the information indicating the machining control period and the information on the measured machining time are transmitted to an external device. A measuring method for measuring a processing time of a workpiece by the machining unit for a machining device having a machining unit for machining the workpiece and a machining control unit for controlling the operation of the machining unit according to machining control information, comprising: ,
inputting a detection signal from a vibration sensor attached to the processing device or the work piece so as to detect vibration caused by the processing of the work piece by the processing unit;
A period in which the machining control unit causes the machining unit to perform machining operations on the workpiece in accordance with the machining control information, during which the machining unit is displaced at a machining feed rate lower than a rapid feed rate from a retracted position. A machining control period, which is a period, is specified by communicating with the machining control unit, and only the detection signal within the machining control period is targeted, and the machining time of the workpiece based on the detection signal is measured. perform measurement processing,
The processing unit has a spindle that rotates the tool,
In the measurement process,
The machining time is measured based on a signal obtained by removing the spindle rotational vibration component, which is the frequency component of the rotational vibration of the spindle, from the detection signal. change according to
measurement method. In a processing apparatus having a processing unit that processes a workpiece and a processing control unit that controls the operation of the processing unit according to processing control information, processing is performed by a computer device that measures the processing time of the workpiece by the processing unit. A program that executes
inputting a detection signal from a vibration sensor attached to the processing device or the work piece so as to detect vibration caused by the processing of the work piece by the processing unit;
A period in which the machining control unit causes the machining unit to perform machining operations on the workpiece in accordance with the machining control information, during which the machining unit is displaced at a machining feed rate lower than a rapid feed rate from a retracted position. A machining control period, which is a period, is specified by communicating with the machining control unit, and only the detection signal within the machining control period is targeted, and the machining time of the workpiece based on the detection signal is measured. measurement process to be performed,
is a program that causes the computer device to execute
The processing unit has a spindle that rotates the tool,
As the measurement process,
The machining time is measured based on a signal obtained by removing the spindle rotational vibration component, which is the frequency component of the rotational vibration of the spindle, from the detection signal. cause the computer device to execute a process that changes according to
program.

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