WO2022092186A1

WO2022092186A1 - Method for determining bolt being used in fastening operation from plurality of bolts, computer readable recording medium having program recorded thereon, device comprising computer readable recording medium having program recorded thereon, method for determining bolt being used in loosening operation from plurality of bolts

Info

Publication number: WO2022092186A1
Application number: PCT/JP2021/039781
Authority: WO
Inventors: 怜奈島田; 華実神原; 鉄平岡本; 康治近藤
Original assignee: ニチアス株式会社
Priority date: 2020-10-30
Filing date: 2021-10-28
Publication date: 2022-05-05
Also published as: JP7295197B2; JP2022074032A

Abstract

In this method for determining a bolt being used in a fastening operation from a plurality of bolts, a computer is used to determine, out of a plurality of values indicating tightening strength, a plurality of values indicating tightening strength that changed in an increasing direction and exceeded a prescribed threshold value, and the computer is used to determine that a bolt corresponding to the value indicating tightening strength that changed the most out of the plurality of values indicating tightening strength that changed in an increasing direction is the bolt being used in a fastening operation.

Description

How to determine the bolt being fastened from multiple bolts, a computer-readable recording medium on which the program is recorded, a device with a computer-readable recording medium on which the program is recorded, and a bolt being loosened from multiple bolts. how to

The present invention relates to a method of discriminating a bolt during a fastening operation from a plurality of bolts connecting flange joints to each other.

In factories and residences, flange joint structures are often used to connect pipes. This flange joint structure has a pair of flange portions and fixing means (bolts or the like) for fixing the flange portions to each other. The operator can connect the pipes to each other by fixing the flanges to each other by using a fixing means in a state where the flanges are butted against each other. Gaskets are often interposed between the flanges.

JP-A-2015-217497

The bolt fastening work of such a flange joint structure is usually performed manually by an operator. If the bolts are not fastened properly, the sealing performance cannot be maintained for a long period of time, and there is a problem that the contents of the pipe leak from the flange portion. Therefore, a worker who fastens the flange joint structure is required to have a certain level of skill. Therefore, there has been a demand for a tool for improving the skills of workers.

Therefore, an object of the present invention is a method used in a flange bolt fastening system for improving the skill of a worker who fastens a flange portion, and a method of discriminating a bolt during a fastening operation from a plurality of bolts. To provide.

The above problem is solved by the following. That is, in the method of discriminating the bolt being fastened from the plurality of bolts of the present invention (1), a plurality of sensors for measuring the strain values of the plurality of bolts capable of fastening the pair of flange portions, and the plurality of sensors. It is provided with a computer for acquiring a plurality of tightening strength values corresponding to the plurality of bolts obtained from the plurality of strain values obtained in the above-mentioned method, and a display device for displaying the plurality of tightening strength values. A method of discriminating bolts being fastened from a plurality of bolts using a flange bolt fastening system, in which the number of values indicating the plurality of tightening strengths by the computer increases beyond a predetermined threshold. The value indicating the plurality of tightening strengths varied in Determine the bolt as the bolt being fastened.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (2) is the method according to (1).
The computer acquires a value indicating the plurality of tightening strengths from the plurality of strain values at predetermined time intervals.

The method for discriminating a bolt during a fastening operation from a plurality of bolts according to the present invention (3) is the method according to (1) or (2).
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
The computer recognizes the bolt to which the fastening operation is first performed as a reference bolt, and when it is determined that a predetermined number of the bolts including the reference bolt among the plurality of bolts have been fastened, the number of laps is 1. After that, the number of laps is increased by 1 for each tightening operation of the reference bolt.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (4) is the method according to any one of (1) to (3).
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
When the bolt being fastened by the computer and the bolt to be fastened immediately before it are in diagonal positions, it is recognized as a diagonal pair, and when two or more diagonal pairs are certified, diagonal tightening is performed. Is determined.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (5) is the method according to any one of (1) to (4).
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
When the bolt that is being fastened by the computer and the bolt that was fastened immediately before it are adjacent to each other along the arrangement direction of the plurality of bolts, it is recognized as a circumferential pair and two or more circumferential pairs. When is certified, it is judged to be a circumferential tightening.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (6) is the method according to (4) or (5).
When the value indicating the tightening strength of the bolt determined to be the bolt during the fastening operation by the computer is gradually increased toward the target value, it is determined to be step tightening.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (7) is the method according to any one of (1) to (6).
After all the fastening operations of the plurality of bolts are completed, the computer extracts the maximum value and the minimum value among the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts, and the difference between them. Is determined to have a large variation when it exceeds a predetermined range.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (8) is the method according to any one of (1) to (7).
The computer extracts the maximum value from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts, and when the maximum value exceeds a predetermined range, it is determined that excessive tightening is present.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (9) is the method according to any one of (1) to (8).
The computer extracts the minimum value from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts, and when the minimum value is below a predetermined range, it is determined that the tightening force is insufficient.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (10) is the method according to any one of (7) to (9).
The flange bolt fastening system has a pair of flanges and a gasket that is sandwiched and held between the pair of flanges.
The computer has an input unit.
The predetermined range is set by the computer that receives the input of the gasket type to the input unit.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (11) is the method according to any one of (7) to (10).
The display device is made to display a message notifying that the computer has deviated from the predetermined range.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (12) is the method according to any one of (1) to (11).
The computer causes the display device to display the determination result of the bolt during the fastening operation.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (13) is the method according to any one of (1) to (12).
The computer measures the time from the start to the completion of the fastening operation of the plurality of bolts, and displays the measurement result on the display device.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (14) is the method according to any one of (1) to (13).
The proficiency level is displayed on the display device by the computer.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (15) is the method according to any one of (1) to (14).
The computer displays a comment on the worker's fastening operation on the display device.

The method for discriminating a bolt during a fastening operation from a plurality of bolts in the present invention (16) is the method according to any one of (1) to (15).
Based on the user's selection, the display function of the display device is turned off by the computer, and after the fastening operation of the plurality of bolts is completed, the determination result of the bolt for which the fastening operation is performed is displayed on the display device in chronological order. do.

The computer-readable recording medium on which the program of the present invention (17) is recorded is
A plurality of sensors for measuring the strain values of a plurality of bolts capable of fastening a pair of flanges, and a plurality of tightening strengths corresponding to the plurality of bolts obtained from the plurality of strain values obtained by the plurality of sensors. A computer-readable recording medium in which a program for realizing the following functions is recorded in a flange bolt fastening system including a computer for acquiring a value indicating a value indicating the above and a display device for displaying a plurality of values indicating a tightening strength. And,
Among the values indicating the plurality of tightening strengths by the computer, a function of discriminating a plurality of values indicating a plurality of tightening strengths that fluctuate in a direction of increasing beyond a predetermined threshold value.
The computer realizes a function of discriminating the bolt corresponding to the value indicating the most fluctuating tightening strength among the values indicating the plurality of tightening strengths fluctuating in the increasing direction as the bolt being fastened. Let me.

The computer-readable recording medium on which the program of the present invention (18) is recorded is a computer-readable recording medium on which the program of (17) is recorded.
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
The computer recognizes the bolt to which the fastening operation is first performed as a reference bolt, and when it is determined that a predetermined number of the bolts including the reference bolt among the plurality of bolts have been fastened, the number of laps is 1. After that, the function of increasing the number of laps by 1 for each tightening operation of the reference bolt is realized.

The computer-readable recording medium on which the program of the present invention (19) is recorded is a computer-readable recording medium on which the program according to (17) or (18) is recorded.
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
When the bolt being fastened by the computer and the bolt to be fastened immediately before it are in diagonal positions, it is recognized as a diagonal pair, and when two or more diagonal pairs are certified, diagonal tightening is performed. Realize the function to judge.

The computer-readable recording medium on which the program of the present invention (20) is recorded is a computer-readable recording medium on which the program according to any one of (17) to (19) is recorded.
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
When the bolt that is being fastened by the computer and the bolt that was fastened immediately before it are adjacent to each other along the arrangement direction of the plurality of bolts, it is recognized as a circumferential pair and two or more circumferential pairs. Realizes the function of determining the circumference tightening when is certified.

The computer-readable recording medium on which the program of the present invention (21) is recorded is a computer-readable recording medium on which the program according to any one of (17) to (20) is recorded.
After all the fastening operations of the plurality of bolts are completed, the computer extracts the maximum value and the minimum value among the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts, and the difference between them. Realizes a function of determining that the variation is large when the value exceeds a predetermined range.

The computer-readable recording medium on which the program of the present invention (22) is recorded is a computer-readable recording medium on which the program according to any one of (17) to (21) is recorded.
A function of extracting the maximum value from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts by the computer and determining that excessive tightening is present when the maximum value exceeds a predetermined range. make it happen.

The computer-readable recording medium on which the program of the present invention (23) is recorded is a computer-readable recording medium on which the program according to any one of (17) to (22) is recorded.
A function of extracting the minimum value from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts by the computer and determining that the tightening force is insufficient when the minimum value is below a predetermined range. make it happen.

The apparatus of the present invention (24) has a computer-readable recording medium on which the program according to any one of (17) to (23) is recorded.

The method of discriminating the bolt being loosened from the plurality of bolts of the present invention (25) is
A plurality of sensors for measuring the strain values of a plurality of bolts capable of fastening a pair of flanges, and a plurality of tightening strengths corresponding to the plurality of bolts obtained from the plurality of strain values obtained by the plurality of sensors. A method of discriminating a bolt being loosened from a plurality of bolts by using a flange bolt fastening system including a computer for acquiring a value indicating a value indicating There,
Among the values indicating the plurality of tightening strengths, the computer determines a value indicating a plurality of tightening strengths that fluctuate in a direction of decreasing beyond a predetermined threshold value.
From a plurality of bolts that are determined to be bolts being operated by loosening the bolt corresponding to the value indicating the tightening strength that fluctuates most among the values indicating the tightening strength that fluctuates in the decreasing direction by the computer. Determine which bolt is being loosened.

The method for discriminating a bolt being loosened from a plurality of bolts in the present invention (26) is the method according to (25).
The computer acquires a value indicating the plurality of tightening strengths from the plurality of strain values at predetermined time intervals.

The computer-readable recording medium of the present invention (27) is
A plurality of sensors for measuring the strain values of a plurality of bolts capable of fastening a pair of flanges, and a plurality of tightening strengths corresponding to the plurality of bolts obtained from the plurality of strain values obtained by the plurality of sensors. A computer-readable recording medium in which a program for realizing the following functions is recorded in a flange bolt fastening system including a computer for acquiring a value indicating a value indicating the above and a display device for displaying a plurality of values indicating a tightening strength. And,
Among the values indicating the plurality of tightening strengths by the computer, a function of discriminating a plurality of values indicating a plurality of tightening strengths that fluctuate in a direction of decreasing beyond a predetermined threshold value.
The computer realizes a function of loosening the bolt corresponding to the value indicating the most fluctuating tightening strength among the values indicating the plurality of tightening strengths fluctuating in the decreasing direction and discriminating the bolt as a bolt being operated. Recorded the program to be made.

The apparatus of the present invention (28) has a computer-readable recording medium on which the program according to (27) is recorded.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a method used in a flange bolt fastening system for improving the skill of a worker who fastens a flange portion, and provides a method for discriminating a bolt being fastened from a plurality of bolts. ..

It is a schematic diagram which showed the flange part bolt fastening system of embodiment. FIG. 3 is an enlarged cross-sectional view showing a bolt and a sensor of the flange bolt fastening system shown in FIG. 1. It is a table which shows the log of the torque value every 1 second obtained by the measuring apparatus of the system shown in FIG. It is a flowchart which shows the method of discriminating bolts in a fastening operation from a plurality of bolts which concerns on 1st Embodiment used in the system shown in FIG. It is a log which is partially extracted from the log of the torque value every 1 second shown in FIG. 3, and is the table which shows the log which attached the discrimination result of the bolt during the fastening operation. This is an example of a display image including images (icons) of a plurality of bolts shown on the display device of the system shown in FIG. 1 and showing the result of determining that the first bolt is being fastened. This is an example of a display image including images (icons) of a plurality of bolts shown on the display device of the system shown in FIG. 1 and showing the result of determining that the fifth bolt is being fastened. It is a flowchart which shows the method of discriminating the bolt which is the fastening operation from the plurality of bolts which concerns on 2nd Embodiment used in the system shown in FIG. It is a flowchart which shows the subroutine of the circumference tightening determination shown in FIG. It is a figure explaining the specific example which is determined to be diagonally tightened, and the specific example which is not determined to be diagonally tightened by the method of discriminating the bolt being fastened from the plurality of bolts shown in FIG. It is a figure explaining the specific example which is determined to be the circumferential tightening, and the specific example which is not determined to be the circumferential tightening by the subroutine of the circumferential tightening determination shown in FIG. It is a flowchart which shows the method of discriminating bolts in a fastening operation from a plurality of bolts which concerns on 3rd Embodiment used in the system shown in FIG. It is a flowchart which shows the method of discriminating the bolt which is the fastening operation from the plurality of bolts which concerns on 4th Embodiment used in the system shown in FIG. It is a flowchart which shows the method of discriminating the bolt which is the fastening operation from the plurality of bolts which concerns on 5th Embodiment used in the system shown in FIG. It is a flowchart which shows the method of discriminating the bolt which is the fastening operation from the plurality of bolts which concerns on 6th Embodiment used in the system shown in FIG. It is a graph which shows the elastic interaction which is seen at the time of the bolt loosening operation in the method of discriminating the bolt under loosening operation from the plurality of bolts which concerns on 7th Embodiment used in the system shown in FIG. It is a flowchart which shows the method of discriminating the bolt which is loosening operation from the plurality of bolts which concerns on 7th Embodiment used in the system shown in FIG.

The details of the method of discriminating the bolt being fastened from a plurality of bolts used in the flange bolt fastening system and various application methods using the bolts will be described below with reference to the drawings. The system contributes to the improvement of the skill of the worker who fastens the flange structure and the determination of the worker's current skill (proficiency level).

[First Embodiment]
With reference to FIGS. 1 to 7, a method of discriminating a bolt during a fastening operation from the flange bolt fastening system 11 of the embodiment and a plurality of bolts using the same, and a first application method using the same will be described.

The system 11 includes a first pipe 12, a second pipe 13 abutted against the first pipe 12, a first flange portion 14 provided on the first pipe 12, and a second flange provided on the second pipe 13. A plurality of bolts 16 and a plurality of nuts connecting the portion 15, the sealing member 19 interposed between the first flange portion 14 and the second flange portion 15, and the first flange portion 14 and the second flange portion 15. 17 and a plurality of sensors 18 for detecting axial strain values of a plurality of bolts 16, and a measuring device 21 (data logger) connected to the plurality of sensors 18 and recording information (strain values, etc.) measured by the sensors 18. ), The computer 22 connected to the measuring device 21 and acquiring information (strain value, etc.) from the measuring device 21, the display device 24 (display) connected to the computer 22, and the information acquired by the computer 22 are organized. It is provided with a server 23 for storing the data. The first pipe 12 and the second pipe 13 imitate the pipes installed in a factory or a home. The first pipe 12 and the second pipe 13 are placed on the support base 25.

The plurality of bolts 16 can be connected so as to penetrate the first flange portion 14 and the second flange portion 15 and abut each other. In this embodiment, the number of bolts 16 is eight. That is, in the present embodiment, the plurality of bolts 16 include the first to eighth bolts 16A to 16H. The number of bolts 16 included in the system 11 is arbitrary. The number of bolts 16 can be appropriately changed to 4, 6, 10, 12, 14, ..., Etc., depending on the diameters of the first flange portion 14 and the second flange portion 15 and the like.

The seal member 19 is composed of a gasket. The gasket constituting the seal member 19 is made of, for example, a metal gasket.

Each of the plurality of sensors 18 is composed of a strain gauge capable of detecting the axial strain of the bolt 16 when the bolt is fastened. Strain gauges are commercially available. The sensor 18 (strain gauge) is adhered to, for example, a hole formed in the center of the bolt 16 by using an adhesive or the like. The sensor 18 (strain gauge) can measure the strain value in the axial direction acting on the bolt 16. The sensor 18 (strain gauge) may be adhered to the outer peripheral surface of the shaft of the bolt 16.

The measuring device 21 is composed of a strain gauge and a commercially available general data logger. The measuring device 21 can acquire the current strain value of the bolt 16 from the strain gauge at predetermined time intervals, for example. The measuring device 21 sends strain value data to the computer 22. The computer 22 can immediately calculate the axial force value and the torque value acting on the bolt 16 and store them in the built-in memory, which are obtained by calculating from the strain value by a known method.

Alternatively, the axial force value and the torque value may be calculated in the measuring device 21. In that case, the measuring device 21 can immediately calculate the axial force value and the torque value obtained by calculating from the strain value by a known method and can store them in the built-in memory.

The timing at which the measuring device 21 acquires the strain value or the like as a log from the strain gauge is arbitrary and can be appropriately determined. The measuring device 21 may acquire the strain value from the strain gauge every 1 to 10 seconds, preferably every 1 to 5 seconds, and more preferably every 1 to 5 seconds. The strain value may be obtained from the strain gauge every 1 to 3 seconds, and most preferably the strain value may be obtained from the strain gauge every 0.5 to 1.5 seconds.

The measuring device 21 may acquire the strain value from the strain gauge every 0.8 to 1.5 seconds, preferably every 0.5 to 1.0 second. Alternatively, the strain value may be obtained from the strain gauge every 0.1 to 0.3 seconds.

The computer 22 is composed of a general PC (personal computer). The computer 22 has an input unit 41 for inputting to the main body of the computer 22. In the present embodiment, the input unit 41 is composed of, for example, a keyboard and a mouse. Dedicated software is installed in the hard disk drive 31 built in the computer 22. The software program is based on the algorithm shown in the flowchart shown in FIG. As will be described later, the software can discriminate the bolt 16 currently being fastened from the other bolts 16 based on the flowchart shown in FIG. Further, the software can evaluate the proficiency level of the worker based on the work progress of the worker who has received the training and display it on the display device 24. Further, the software can display an appropriate comment on the display device 24 based on the work progress of the trained worker. Further, the computer 22 may be composed of a computer (workstation) on which AI is mounted. In this case, the computer 22 makes an appropriate comment from the past comments based on the data (teacher data) accumulating the past work progress and the comments associated with the past work progress, and AI (neural). It may be displayed on the display device 24 based on the network). The system 11 is an example of a device having a computer-readable recording medium on which the above program is recorded.

The hard disk drive 31 is an example of a computer-readable recording medium on which the program of the software is recorded. The computer-readable recording medium on which the program of the software is recorded may be other than the hard disk drive 31, and may be, for example, an optical disk or a non-volatile memory such as a ROM, RAM, flash memory, or SSD.

The dedicated software can display the dedicated screen of the system 11 on the display device 24 and perform various calculations and the like. The software acquires a plurality of information (strain value logs) corresponding to the plurality of bolts 16 stored in the measuring device 21 from the measuring device 21 with almost no time lag. The software can calculate the log of the axial force value (stress value) working on the bolt 16 and the log of the torque value by a known calculation formula from the logs of these plurality of strain values. These axial force values and torque values are examples of values indicating the tightening strength corresponding to the bolt. The relationship between the torque value and the axial force value (torque coefficient) is usually different for each bolt. In the flange bolt fastening system 11, since the torque coefficients of each bolt 16 are substantially the same, both the torque value and the axial force value can be used as examples of values indicating the tightening strength.

The software can display these strain value logs, axial force value logs, and torque value logs on a dedicated screen as needed. The software can transmit the above-mentioned various logs to the server 23 and store them in an organized state on the server 23. The software has a timer function of measuring the time from the start to the completion of the bolt 16 fastening operation and displaying it on the display device 24.

When the measuring device 21 stores the strain value as well as the axial force value and the torque value obtained from it, the software of the computer 22 has a plurality of information corresponding to the plurality of bolts 16 stored in the measuring device 21. (Strain value log, axial force value log, torque value log) can be acquired from the measuring device 21 with almost no time lag. The software can display these strain value logs, axial force value logs, and torque value logs as appropriate in a dedicated screen. The software can transmit the above-mentioned various logs to the server 23 and store them in an organized state on the server 23.

Subsequently, with reference to FIGS. 3 to 7, a method for discriminating the bolt 16 being fastened from the plurality of bolts 16 used in the system 11 of the present embodiment, a first application method thereof, and a program for executing them. (Software) will be described.

Prior to the training for bolt fastening workers, start the system 11 and computer 22 (software). The sensor 18 (strain gauge) constantly measures the strain value of the bolt 16. The measuring device 21 acquires a strain value from the sensor 18 every 1 to 3 seconds, for example. The measuring device 21 stores the strain value thus obtained as a log every 1 to 3 seconds. The measuring device 21 stores a log of these strain values for each bolt 16. The software of the computer 22 acquires a log of the strain value from the measuring device 21, and calculates a log of the axial force value and a log of the torque value corresponding to the log of the strain value. FIG. 3 shows an example of a torque value log (torque value log for each bolt 16) corresponding to a strain value log measured every 1 to 3 seconds. The unit is Nm. In FIG. 3, the time elapses by 1 to 3 seconds as it goes to the lower column. In the table of FIG. 3, it is expressed in the form of rounding off to the second decimal place. The computer 22 (the software) can also create a log of the axial force value calculated to correspond to the log of the strain value measured every 1 to 3 seconds together with the log of the torque value.

On the other hand, when the measuring device 21 calculates the axial force value log and the torque value log based on the strain value log, the computer 22 (the software concerned) performs the axial force value log and the axial force value log together with the strain value log. You can get the log of the torque value.

As shown in step S11 of FIG. 4, the computer 22 determines, among the plurality of torque values corresponding to the obtained plurality of bolts 16, a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value. do. In the present embodiment, the computer 22 stores, for example, 1 to 5 Nm as a threshold value, and the threshold value can be appropriately set by the user according to the total number, diameter, length, and the like of the bolts 16. From the log shown in FIG. 3, the computer 22 determines the torque value corresponding to the candidate bolt 16 among the first to eighth bolts 16A to 16H. The number of candidate bolts 16 may be any number from 1 to 8.

The size of this threshold is arbitrary. If the threshold value is smaller than the above range, the candidates for the bolt 16 during the fastening operation cannot be selected well. If the threshold value becomes larger than the above range, it leads to the failure to detect the bolt 16 that is actually performing the fastening operation.

When, for example, 2 to 4 torque values are determined in step S11, the computer 22 is in the process of fastening the bolt 16 corresponding to the torque value that fluctuates most among the 2 to 4 torque values. It is determined to be the bolt 16 (step S12). By adopting such a discrimination method, the computer 22 can reliably discriminate the bolt 16 being operated.

FIG. 5 shows a log of the torque value to which the result of actually determining the bolt 16 being fastened by the computer 22 (the software concerned) is attached. The unit is Nm. The log shown in FIG. 5 is a part of the log shown in FIG. 3, and the log when the bolt 16 actually being fastened is determined is extracted from the log of FIG. The discrimination result is shown as a circle together with the torque value of each log. From FIG. 5, it is understood that the bolts 16 determined to be currently being fastened are sequentially replaced together with the actual bolt 16 fastening work by the operator. In FIG. 5, time elapses as it goes to the lower column.

Further, the computer 22 (the software) displays this determination result on the display device 24 (step S12). 6 and 7 show an image of displaying the discrimination result on the display device 24. The display device 24 shows images (icons) of the first to eighth bolts 16A to 16H. The images (icons) of the 1st to 8th bolts 16A to 16H are displayed on the display device 24 corresponding to the actual positions of the 1st to 8th bolts 16A to 16H.

When the computer 22 determines that the first bolt 16A is currently being fastened according to steps S11 and S12, the computer 22 surrounds the image (icon) of the first bolt 16A with a thick square frame and emphasizes it (Fig.). 6). Next, when it is determined that the fifth bolt 16E is being fastened, the image (icon) of the fifth bolt 16E is surrounded by a thick square frame and emphasized (see FIG. 7). The computer 22 displays, for example, a torque value or an axial force value, which is a value indicating the current tightening strength of the bolt 16, in or near the image (icon) of the first to eighth bolts 16A to 16H of the display device 24. It can be displayed (step S12). As shown in FIGS. 6 and 7, the magnitude of the torque value or the axial force value may be expressed by the color or pattern of the bar in the image, or may be directly expressed by a numerical value or the like.

As a result, the trained worker can fasten the bolt 16 while checking the torque value or the axial force value of the bolt 16 currently being operated. The operator can proceed with the fastening work while confirming the number and the like of the bolt 16 being fastened on the display device 24.

In the present embodiment, the computer 22 (software) can determine the number of bolt tightening laps in addition to the determination of the bolt 16 during the fastening operation. The computer 22 certifies the bolt 16 to which the operator first fastens as a reference bolt. When it is determined that a predetermined number of bolts including the reference bolt among the plurality of bolts 16 have been fastened, the computer 22 determines that the number of laps is 1 (step S13). At that time, the predetermined number may be 1 or more, and an appropriate number can be set, for example, 2 to 6, preferably 3 to 5.

It will be explained below assuming that 4 is set as a predetermined number. The operator first fastens the first bolt 16A, then fastens the second bolt 16B, then fastens the third bolt 16C, then fastens the fourth bolt 16D, and then the second bolt. It is assumed that the 5-bolt 16E is fastened. At that time, the computer 22 (the software) determines that the number of laps is 1. The order of fastening operations of the 2nd to

5th bolts

16B and 16E does not matter, and even if the fastening operations are performed in an order other than the order of arrangement, if the four bolts 16 are fastened, the number of laps is 1. Is determined.

The computer 22 (the software) maintains 1 lap even when the operator subsequently fastens the 6th bolt 16F, the 7th bolt 16G, and the 8th bolt 16H. Next, when the operator fastens the first bolt 16A, which is the reference bolt, again, the computer 22 (the software) adds 1 to 2 laps (step S14). When the operator operates the bolt 16 other than the reference bolt, the number of laps 2 is maintained. After that, when the operator performs the fastening operation to the first bolt 16A, which is the reference bolt, the computer 22 (the software) increases the number of laps by one. The computer 22 displays the number of laps on the display device 24 at any timing during the fastening operation of the bolt 16 and after the completion of the fastening operation of the bolt 16 (step S15).

The operator can confirm that the torque value or the axial force value of the bolt 16 is within the range of the appropriate value, and can complete the tightening of the bolt 16. After the completion, the operator can confirm the number of laps together with the torque value or the axial force value of each bolt 16 after the tightening is completed on the display screen of the display device 24. Even when a number other than 4 is set as the predetermined number, the number of laps is determined in the same manner as described above, and the number of laps is displayed on the display device 24. Further, the computer 22 determines the proficiency level and the comment of the worker according to the number of laps and the fastening operation time. For example, when the number of laps is 2 or more, the computer 22 displays on the display device 24 that the worker is at a high proficiency level (step S16). On the other hand, when the number of laps is 1, the display device 24 indicates that the worker is at a low proficiency level (step S16). The shorter the fastening operation time, the higher the evaluation. When the fastening operation time exceeds the standard working time, the computer 22 (the software) displays the proficiency level low and displays the following comment (message) on the display device 24. Can be done.
"Careful construction is preferable, but more familiarity with the procedure is expected to improve work efficiency."
This completes the method of discriminating the bolt 16 being fastened from the plurality of bolts 16 and the first application method thereof.

Further, the method of discriminating the bolt 16 being fastened from the flange bolt fastening system 11 of the present embodiment and the plurality of bolts 16 used thereof can be utilized for the certification test of the trained worker. That is, the technical level of the operator can be determined by using various determination criteria using the determination result of the bolt 16 being fastened and the log of the torque value or the axial force value at that time. As a result, it is possible to grasp the technical level of the worker who is going to master the tightening work of the bolt 16 and to contribute to the improvement of the technical level of the worker. In this embodiment, a method of discriminating the bolt 16 during the fastening operation based mainly on the torque value and a first application method thereof are realized, but other values indicating the tightening strength corresponding to the bolt 16 are realized. A method of discriminating the bolt 16 based on an example axial force value and a first application method thereof may be realized.

According to this embodiment, the following can be said. A flange bolt fastening system 11 was used as a method for discriminating the bolt 16 being fastened from the plurality of bolts 16. The flange bolt fastening system 11 has a plurality of sensors 18 for measuring the strain values of the plurality of bolts 16, and a plurality of tightening corresponding to the plurality of bolts obtained from the plurality of strain values obtained by the plurality of sensors 18. A computer 22 for acquiring a value indicating the strength and a display device 24 for displaying a plurality of tightening strength values are provided. In the method of discriminating the bolt 16 during the fastening operation from the plurality of bolts 16, the computer 22 discriminates the plurality of torque values that have changed in the direction of increasing beyond a predetermined threshold value among the plurality of torque values, and the computer 22. Of the plurality of torque values fluctuating in the increasing direction, the bolt 16 corresponding to the most fluctuating torque value is determined to be the bolt 16 being fastened.

The computer-readable recording medium on which the program is recorded realizes the following functions in the flange bolt fastening system. The flange bolt fastening system is obtained from a plurality of sensors that measure the strain values of a plurality of bolts capable of fastening a pair of flange portions, and a plurality of strain values obtained by the plurality of sensors, to the plurality of bolts. A computer for acquiring a plurality of corresponding tightening strength values and a display device for displaying the plurality of tightening strength values are provided. The computer-readable recording medium on which the program is recorded determines, among the values indicating the plurality of tightening strengths by the computer, the values indicating a plurality of tightening strengths that vary in a direction increasing beyond a predetermined threshold value. A function and a function of discriminating the bolt corresponding to the value indicating the most fluctuating tightening strength among the values indicating the plurality of tightening strengths fluctuating in the increasing direction by the computer as the bolt being fastened. , Is realized.

According to these configurations, the computer 22 can accurately determine the bolt 16 currently fastened by the operator. As a result, accurate logs can be taken on the computer 22, which can be effectively used for subsequent analysis using the system 11 (whether stepwise tightening is possible, whether overtightening, etc.).

Further, according to the above configuration, the operator who fastens the bolts can proceed with the fastening work while confirming the number and position of the bolt 16 actually tightened on the screen of the display device 24. As a result, the operator can learn the bolt tightening work while confirming on the screen that the bolt 16 to be fastened is correctly tightened. When the computer 22 displays on the display device 24 a value indicating the current plurality of tightening strengths of the bolt 16 currently being fastened, the operator displays the current plurality of tightening strengths. You can proceed with the work while checking the indicated values. As a result, it is possible to proceed with the training while performing the actual work with an appropriate tightening amount. It can also be used to determine the worker's current skill (proficiency level).

The computer 22 acquires a value indicating the plurality of tightening strengths from the plurality of strain values at predetermined time intervals. Then, among the plurality of acquired torque values, a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value are discriminated. According to this configuration, it is possible to acquire a plurality of torque values so as to thin out information to some extent so that the amount of data does not become enormous while preventing the detection omission of the bolt 16 during operation. This makes it possible to accurately determine the bolt 16 during the fastening operation.

The flange bolt fastening system 11 has a plurality of sensors 18 for measuring strain values of a plurality of bolts 16 arranged discretely in an annular shape, and a plurality of bolts obtained from a plurality of strain values obtained by the plurality of sensors 18. A computer 22 for acquiring a plurality of tightening strength values corresponding to 16 and a display device 24 for displaying a plurality of tightening strength values are provided. The method of discriminating a bolt during a fastening operation from a plurality of bolts 16 using the flange portion bolt fastening system 11 increases beyond a predetermined threshold value among the values indicating the plurality of tightening strengths by the computer 22. A value indicating a plurality of tightening strengths fluctuating in a direction is determined, and the computer 22 corresponds to a value indicating the largest fluctuating tightening strength among the values indicating a plurality of tightening strengths fluctuating in an increasing direction. The bolt 16 is determined to be the bolt 16 being fastened, and the computer 22 recognizes the bolt 16 that has been fastened first as the reference bolt, and among the plurality of bolts 16, a predetermined number of bolts 16 including the reference bolt are used. When it is determined that the fastening operation has been performed, the number of laps is determined as 1, and thereafter, the number of laps is increased by 1 for each fastening operation of the reference bolt.

The computer-readable recording medium on which the program is recorded is obtained from a plurality of sensors 18 that measure the strain values of a plurality of bolts 16 arranged discretely in an annular shape, and a plurality of strain values obtained by the plurality of sensors 18. A flange bolt fastening system 11 comprising a computer 22 that acquires a value indicating a plurality of tightening strengths corresponding to the plurality of bolts 16 and a display device 24 that displays a value indicating the plurality of tightening strengths. The following functions are realized. The computer-readable recording medium on which the program is recorded determines, among the values indicating the plurality of tightening strengths, the values indicating the plurality of tightening strengths varied in a direction increasing beyond a predetermined threshold value by the computer 22. The function and the function of discriminating the bolt 16 corresponding to the value indicating the most fluctuating tightening strength among the values indicating the plurality of tightening strengths fluctuating in the increasing direction by the computer 22 as the bolt 16 being fastened. The computer 22 recognizes the bolt 16 to which the fastening operation is first performed as the reference bolt, and when it is determined that a predetermined number of bolts 16 including the reference bolt among the plurality of bolts 16 have been fastened, the number of laps is determined. Is determined as 1, and thereafter, the function of discriminating the bolt being fastened from a plurality of bolts, which increases the number of laps by 1 for each fastening operation of the reference bolt, is realized.

According to these configurations, the operator can grasp the number of laps of bolt fastening together with the determination result of the bolt 16 during the fastening operation. As a result, it is possible to accurately grasp whether the fastening work of the bolt 16 is properly performed, and it is possible for the worker to receive training in the fastening work by grasping the progress of the fastening work of the bolt 16.

In this case, the computer 22 causes the display device 24 to display the determination result of the bolt 16 during the fastening operation.

According to this configuration, the information of the bolt 16 during the fastening operation can be notified to the operator via the display device 24. As a result, the operator can proceed with the bolt 16 fastening work while checking the information of the bolt 16 currently being fastened on the display device 24. As a result, it is possible to perform the fastening work of the bolt 16 with higher accuracy, and it is possible to teach the operator the tightening work with higher accuracy. It can also be used to determine the worker's current skill (proficiency level).

In this case, the computer 22 measures the time from the start to the completion of the fastening operation of the plurality of bolts 16 and displays the measurement result on the display device 24. According to this configuration, the working time can be notified to the operator together with the determination result of the bolt 16 during the fastening operation. As a result, it is possible to encourage the worker to finish the work in a short time, and it is possible to teach the bolt 16 fastening work while improving the work efficiency. It can also be used to determine the worker's current skill (proficiency level).

In this case, the computer 22 causes the display device 24 to display a value indicating a plurality of tightening strengths corresponding to the plurality of bolts 16. According to this configuration, the trained worker can fasten the bolt 16 while checking the value indicating the current tightening strength on the screen of the display device 24. As a result, it is possible to compare the amount of force that is actually tightened by hand with the numerical value that indicates the tightening strength during work, and to receive training on highly accurate and efficient bolt tightening work. Can be done.

In this case, the proficiency level is displayed on the display device 24 by the computer 22. According to this configuration, it is possible to motivate the trained workers to improve their skills. This can encourage trained workers to further train to acquire skills.

In this case, the computer 22 displays the comment on the worker's fastening operation on the display device 24. According to this configuration, it is possible to point out points to be appropriately improved to the workers who are undergoing training. As a result, the worker can acquire the skill more efficiently.

In the following embodiments, the parts different from the first embodiment will be mainly described, and the illustration and description of the parts common to the first embodiment will be omitted.

[Second Embodiment]
With reference to FIGS. 8 to 11, a method of discriminating the bolt 16 being fastened from the flange bolt fastening system 11 of the second embodiment and a plurality of bolts 16 using the same, and a second application method using the same. Will be explained. In the present embodiment, in addition to the matters described in the first embodiment, the computer 22 can determine diagonal tightening, diagonal step tightening, circumferential tightening, and circumferential step tightening. Software (program) created based on the algorithm shown in the flowchart shown in FIG. 8 is installed in the hard disk drive 31 of the computer 22. The system 11 is an example of a device having a computer-readable recording medium on which the above program is recorded.

A method of discriminating the bolt 16 being fastened from a plurality of bolts 16 used in the system 11 of the present embodiment and a second application method thereof will be described with reference to FIGS. 8 and 9.

System 11 is started prior to the training for bolt fastening workers. The sensor 18 (strain gauge) constantly measures the strain value of the bolt 16. The measuring device 21 acquires a strain value from the sensor 18 every 1 to 3 seconds, for example. The measuring device 21 stores the strain value thus obtained as a log every 1 to 3 seconds. The measuring device 21 stores a log of these strain values for each bolt 16. The software of the computer 22 acquires a log of the strain value from the measuring device 21, and calculates a log of the axial force value and a log of the torque value corresponding to the log of the strain value. On the other hand, when the measuring device 21 calculates the axial force value log and the torque value log based on the strain value log, the computer 22 (the software concerned) performs the axial force value log and the axial force value log together with the strain value log. You can get the log of the torque value.

As shown in step S21 of FIG. 8, the computer 22 (the software) has a plurality of torque values corresponding to the obtained plurality of bolts 16 which are varied in a direction of increasing beyond a predetermined threshold value. Determine the torque value. In the present embodiment, the computer 22 stores, for example, 1 to 5 Nm as a threshold value, and the threshold value can be appropriately set by the user according to the total number, diameter, length, and the like of the bolts 16. From the above log, the computer 22 determines the torque value corresponding to the candidate bolt 16 among the first to eighth bolts 16A to 16H. The number of candidate bolts 16 may be any number from 1 to 8.

When, for example, 2 to 4 torque values are determined in step S21, the computer 22 is in the process of fastening the bolt 16 corresponding to the torque value that fluctuates most among the 2 to 4 torque values. It is determined to be the bolt 16 and displayed on the display device (step S22). By adopting such a discrimination method, the computer 22 can reliably discriminate the bolt 16 being operated.

The computer 22 (the software) determines whether or not the bolts 16 that have been fastened in order are diagonally tightened (steps S23 to S30). That is, it is determined whether or not the bolts 16 that have been sequentially fastened are in diagonal positions (step S23). For example, when the total number of bolts 16 is 8, and the difference in bolt numbers between the bolts 16 is 4, the computer 22 recognizes them as diagonal pairs as diagonal pairs (step S24). If the diagonal pair is not certified, it is determined that the diagonal pair is not tightened (step S29).

Further, the computer 22 determines whether or not there are two or more different diagonal pairs (step S25). When there are two or more different diagonal pairs, the computer 22 determines that the diagonal tightening is performed (step S26). When the number of different diagonal pairs is 1 or less, the computer 22 determines that the diagonal tightening is not performed (step S30).

More specifically, for example, as in Example 1 shown in FIG. 10, when the first bolt 16A, the fifth bolt 16E, the third bolt 16C, the seventh bolt 16G, and the first bolt 16A are fastened in this order. The first bolt 16A and the fifth bolt 16E shown in a square form a diagonal pair, and the third bolt 16C and the seventh bolt 16G shown in a square form a diagonal pair. Therefore, two or more different diagonal pairs are recognized, and the computer 22 determines that it is diagonally tightened.

Similarly, as in Example 2 shown in FIG. 10, when four or more diagonal pairs shown in a square are certified, the computer 22 also determines that the diagonal tightening is performed. As in Example 3 shown in FIG. 10, there is no diagonal pair between the second bolt 16B and the sixth bolt 16F of the diagonal pair and the fourth bolt 16D and the eighth bolt 16H of the diagonal pair. Even when the second bolt 16B is fastened, the computer 22 determines that the second bolt 16B is diagonally tightened.

On the other hand, as in Example 4 shown in FIG. 10, when there is one diagonal pair surrounded by a square, the computer 22 determines that the diagonal tightening is not performed.

Further, the computer 22 (the software) determines whether or not the tightening torque of the bolt 16 is gradually increased (step S27 in FIG. 8). At that time, the computer 22 determines whether or not the procedure for gradually increasing the tightening torque, which is recommended in JISB2251 "flange joint tightening method", is followed. That is, JISB2251 recommends that the tightening torque is gradually increased in the order of, for example, 10% → 20% → 60% → 100% of the target fastening torque.

Therefore, in the computer 22, the first diagonal pair is fastened at about 10% of the target fastening torque, and then the second, third, fourth diagonal pairs and the like are fastened at about 10% of the target fastening torque. Judge whether or not they are concluded in order (the number of diagonal pairs does not matter). At that time, the computer 22 determines that this criterion is satisfied when the fastening is performed at 5 to 15% of the target fastening torque (for example, a fastening error of 5% is allowed up and down).

Next, in the computer 22, the first diagonal pair is fastened at about 20% of the target fastening torque, and then the second, third, fourth diagonal pairs and the like are fastened at about 20% of the target fastening torque. % To determine whether or not the conclusions are made in order. At that time, the computer 22 determines that this criterion is satisfied when the fastening is performed at 15 to 25% of the target fastening torque (for example, a fastening error of 5% is allowed up and down).

Next, in the computer 22, the first diagonal pair is fastened at about 60% of the target fastening torque, and then the second, third, fourth diagonal pairs and the like are fastened at about 60% of the target fastening torque. % To determine whether or not the conclusions are made in order. At that time, the computer 22 determines that this criterion is satisfied when the fastening is performed at 55 to 65% of the target fastening torque (for example, a fastening error of 5% is allowed up and down).

Next, in the computer 22, the first diagonal pair is fastened at approximately 100% of the target fastening torque, and then the second, third, fourth diagonal pairs and the like are fastened at approximately 100% of the target fastening torque. % To determine whether or not the conclusions are made in order. At that time, the computer 22 determines that this criterion is satisfied when the fastening is performed at 95 to 105% of the target fastening torque (for example, a fastening error of 5% is allowed up and down).

If the above criteria are satisfied, the computer 22 determines that it is a diagonal step tightening (step S28). If the above criteria are not seen, it is determined that the tightening is diagonal, but not diagonal step tightening (step S31).

Next, the computer 22 (the software concerned) determines whether or not it corresponds to the circumferential tightening (step S32, the circumferential tightening determination shown in FIG. 9). As shown in FIG. 9, the computer 22 determines whether or not it is determined to be diagonal tightening or diagonal step tightening in the diagonal tightening determination before that (step S41). If it is not determined to be diagonal tightening or diagonal step tightening, it is determined whether or not it corresponds to circumferential tightening. If it is already determined to be diagonally tightened or diagonally stepped in the previous step, it is immediately determined not to be circumferentially tightened (step S48).

The computer 22 determines whether or not the bolt 16 during the fastening operation and the bolt 16 for which the fastening operation was performed immediately before the bolt 16 are adjacent to each other along the arrangement direction of the bolts 16. In this case, being adjacent to each other along the alignment direction may be adjacent to the positive direction in which the number of the bolt 16 increases (the direction toward the first bolt 16A → the second bolt 16B → the third bolt 16C). However, they may be adjacent to each other in the direction opposite to the forward direction (the direction toward the first bolt 16A → the eighth bolt 16H → the seventh bolt 16G). Further, "adjacent" means that the absolute value of the difference between the bolt numbers is 1. It is assumed that the absolute value of the difference in bolt numbers is 1 even when the 8th bolt 16H is operated after the 1st bolt 16A and the 1st bolt 16A is operated after the 8th bolt 16H. When the bolt 16 during the fastening operation and the bolt 16 for which the fastening operation was performed immediately before the bolt 16 are located adjacent to each other along the arrangement direction of the bolts 16, they are recognized as a circumferential pair (step S43).

In addition to the circumferential pair, the computer 22 tightens the bolts 16 located at adjacent positions along the alignment direction in the same direction (forward direction, reverse direction) as the circumferential pair. Certified as a pair of circumferences of 2. The computer 22 determines whether or not there are two or more different circumferential pairs (step S44). If it is determined that there are two or more different circumferential pairs, the computer 22 determines that the circumference is tightened (step S45). If it is not determined that there are two or more different circumferential pairs, the computer 22 determines that the circumference is not tightened (step S49).

More specifically, for example, as in Example 1 shown in FIG. 11, the first bolt 16A, the second bolt 16B, the third bolt 16C, the fourth bolt 16D, the fifth bolt 16E, the sixth bolt 16F, and the seventh bolt. When the fastening operation is performed in the order of 16G, the 8th bolt 16H, and the 1st bolt 16A, the 1st bolt 16A and the 2nd bolt 16B shown by enclosing them in a square form a circumferential pair, and similarly, enclose them in a square. The 2nd and

3rd bolts

16B and 16C shown are circumferential pairs, the 3rd and

4th bolts

16C and 16D are circumferential pairs, and the 4th and

5th bolts

16D and 16E are circumferential pairs. The 6-

volt

16E and 16F form a circumferential pair, the 6th and

7th bolts

16F and 16G form a circumferential pair, and the 7th and

8th bolts

16G and 16H form a circumferential pair. Therefore, two or more different circumferential pairs are recognized, and the computer 22 determines that the circumference is tightened.

Similarly, as in Example 2 shown in FIG. 11, when three or more circumferential pairs shown in a square are certified and the circumferential pairs are not adjacent to each other along the arrangement direction of the bolts, the same applies. , The computer 22 determines that the circumference is tightened. As shown in Example 3 shown in FIG. 11, two or more circumferential pairs shown in a square are certified, and the first bolt 16A and the second bolt 16B of the circumference pair and the fifth bolt 16E and the second bolt of the circumference pair are certified. Even when there is a large gap between the 6 volt 16F and the 6 volt 16F, the computer 22 determines that the circumference is tightened.

On the other hand, as in Example 4 shown in FIG. 11, when there is one circumferential pair surrounded by a square, the computer 22 determines that the circumference is not tightened.

As shown in FIG. 9, the computer 22 (the software) further determines whether or not the torque value of the bolt 16 during operation is gradually increased (step S46).

At that time, the computer 22 determines whether or not the procedure for gradually increasing the tightening torque, which is recommended in JISB2251 "flange joint tightening method", is followed. That is, JISB2251 recommends that the tightening torque is gradually increased in the order of, for example, 10% → 20% → 60% → 100% of the target fastening torque.

Therefore, in the computer 22, the first circumferential pair is fastened at about 10% of the target fastening torque, and then the second, third, fourth circumferential pairs and the like are fastened at about 10% of the target fastening torque. Judge whether or not they are concluded in order (the number of circumferential pairs does not matter). At that time, the computer 22 determines that this criterion is satisfied when the fastening is performed at 5 to 15% of the target fastening torque (for example, a fastening error of 5% is allowed up and down).

Next, in the computer 22, the first circumferential pair is fastened at about 20% of the target fastening torque, and then the second, third, fourth circumferential pairs and the like are fastened at about 20% of the target fastening torque. % To determine whether or not the conclusions are made in order. At that time, the computer 22 determines that this criterion is satisfied when the fastening is performed at 15 to 25% of the target fastening torque (for example, a fastening error of 5% is allowed up and down).

Next, in the computer 22, the first circumferential pair is fastened at about 60% of the target fastening torque, and then the second, third, fourth circumferential pairs and the like are fastened at about 60% of the target fastening torque. % To determine whether or not the conclusions are made in order. At that time, the computer 22 determines that this criterion is satisfied when the fastening is performed at 55 to 65% of the target fastening torque (for example, a fastening error of 5% is allowed up and down).

Next, in the computer 22, the first circumferential pair is fastened at approximately 100% of the target fastening torque, and then the second, third, fourth circumferential pairs and the like are fastened at approximately 100% of the target fastening torque. % To determine whether or not the conclusions are made in order. At that time, the computer 22 determines that this criterion is satisfied when the fastening is performed at 95 to 105% of the target fastening torque (for example, a fastening error of 5% is allowed up and down).

If the above criteria are satisfied, the computer 22 determines that it is a circumferential step tightening (step S47). If the above criteria are not seen, it is determined that the tightening is circumferential, but not the circumferential step tightening (step S50).

The computer 22 (the software) confirms whether or not the bolt 16 fastening operation has been completed, as shown in step S33 of FIG. The confirmation may be performed, for example, by receiving an input of the work completion from the operator to the computer 22 after the completion of the fastening work, or it is determined that the computer 22 is completed when the bolt is not operated for a predetermined time. May be good. If the fastening work is completed, the process proceeds to the next step S34. If the fastening work is not completed, the process returns to step S21.

The computer 22 (software) includes the presence / absence of diagonal tightening, the total number of diagonal pair tightening, the presence / absence of diagonal step tightening, the presence / absence of circumferential tightening, the total number of circumferential pair occurrences, the presence / absence of circumferential step tightening, and fastening. The proficiency level of the worker is determined from the operation time and the like (step S34). In the case of diagonal tightening, if the total number of occurrences of diagonal pairs exceeds a predetermined number, a high evaluation is given. In addition, diagonal tightening is more highly evaluated than diagonal tightening. In the case of circumferential tightening, if the total number of occurrences of the circumferential pair exceeds a predetermined number, the evaluation is high. In addition, the circumferential tightening is more highly evaluated than the circumferential tightening. The shorter the fastening operation time, the higher the evaluation. The fastening operation time is evaluated low when the standard working time is exceeded.

The computer 22 displays various results such as the fastening torque, axial force, and fastening operation time of each bolt after the completion of the fastening operation, the proficiency level of the operator, and the comment on the display device (step S35).

The computer 22 can display the following comment (message) on the display device 24, for example, when the circumference is not tightened.
"By tightening the circumference, it is expected that the variation in the tightening torque of the bolt will be suppressed. Instead of turning the bolt (nut), convey the same feeling of force to the bolt (nut) and repeat until it does not turn. That is the point. "
The computer 22 can display the following comment (message) on the display device 24, for example, when the step tightening has not been completed.

"The increase in axial force tended to be a little large. By making the amount of tightening at one time a little smaller, it becomes possible to perform stepwise tightening."
For example, the computer 22 improves the fastening operation time within the standard working time as compared with the previous time, and when the step tightening that was completed last time becomes incomplete, the following comment (message) is given. ) Can be displayed on the display device 24.
"It has become faster to tighten than last time. In addition, be aware of tightening with a small torque in the first week, and try to tighten in stages."

This completes the method of discriminating the bolt 16 being fastened from the plurality of bolts 16 and the second application method thereof. In this embodiment, a method of discriminating the bolt 16 during the fastening operation based mainly on the torque value and a second application method thereof are realized, but other values indicating the tightening strength corresponding to the bolt 16 are realized. A method of discriminating the bolt 16 based on an example axial force value and a second application method thereof may be realized.

According to this embodiment, the following can be said. In the flange portion bolt fastening system 11, a plurality of bolts 16 are arranged discretely in an annular shape with respect to a pair of flange portions. In the method of discriminating the bolt 16 during the fastening operation from the plurality of bolts 16, among the values indicating the plurality of tightening strengths, the computer 22 determines the plurality of tightening strengths that vary in the direction of increasing beyond a predetermined threshold value. The indicated value is determined, and the bolt 16 corresponding to the value indicating the largest variation of the tightening strength among the plurality of values indicating the tightening strength varied in the increasing direction by the computer 22 is fastened to the bolt 16 during the fastening operation. When the computer 22 determines that the bolt 16 being fastened and the bolt 16 having been fastened immediately before it are in diagonal positions, the pair is certified as a diagonal pair, and two or more diagonal pairs are certified. At that time, it is judged to be diagonally tightened.

In the flange portion bolt fastening system 11, a plurality of bolts 16 are arranged discretely in an annular shape with respect to a pair of flange portions. The computer-readable recording medium on which the program is recorded determines, among the values indicating the plurality of tightening strengths, the values indicating the plurality of tightening strengths varied in a direction increasing beyond a predetermined threshold value by the computer 22. The function and the function of discriminating the bolt 16 corresponding to the value indicating the largest variation of the tightening strength among the values indicating the plurality of tightening strengths fluctuating in the increasing direction by the computer 22 as the bolt 16 being fastened. And, when the bolt 16 being fastened by the computer 22 and the bolt 16 which was fastened immediately before it are in diagonal positions, they are recognized as diagonal pairs, and when two or more diagonal pairs are certified. The function of determining diagonal tightening is realized.

According to these configurations, it is possible to grasp whether or not diagonal tightening is performed together with the determination result of the bolt 16 during the fastening operation. This makes it possible to more accurately grasp the proficiency level of the worker. Then, this result can be used for the training of the worker.

In the flange portion bolt fastening system 11, a plurality of bolts 16 are arranged discretely in an annular shape with respect to a pair of flange portions. The method of discriminating a bolt during a fastening operation from a plurality of bolts is a value indicating a plurality of tightening strengths which are varied in a direction increasing beyond a predetermined threshold value among the values indicating the plurality of tightening strengths by the computer 22. The computer 22 determines that the bolt 16 corresponding to the value indicating the largest variation in the tightening strength among the values indicating the plurality of tightening strengths fluctuating in the increasing direction is the bolt 16 being fastened. When the bolt 16 being fastened by the computer 22 and the bolt 16 having been fastened immediately before the bolt 16 are adjacent to each other along the arrangement direction of the plurality of bolts 16, it is recognized as a circumferential pair, and two or more. When the circumference pair is certified, it is judged to be the circumference tightening.

In the flange portion bolt fastening system 11, a plurality of bolts 16 are arranged discretely in an annular shape with respect to a pair of flange portions. The computer-readable recording medium on which the program is recorded determines, among the values indicating the plurality of tightening strengths, the values indicating the plurality of tightening strengths varied in a direction increasing beyond a predetermined threshold value by the computer 22. The function and the function of discriminating the bolt 16 corresponding to the value indicating the most fluctuating tightening strength among the values indicating the plurality of tightening strengths fluctuating in the increasing direction by the computer 22 as the bolt 16 being fastened. And, when the bolt 16 that is being fastened by the computer 22 and the bolt 16 that was fastened immediately before it are adjacent to each other along the arrangement direction of the plurality of bolts 16, it is recognized as a circumferential pair, and 2 or more. A function to determine that the circumference is tightened when the circumference pair is certified.

According to these configurations, it is possible to grasp whether or not the bolt 16 is tightened around the circumference together with the determination result of the bolt 16 during the fastening operation. This makes it possible to more accurately grasp the proficiency level of the worker. Then, this result can be used for the training of the worker.

In the method of discriminating the bolt 16 being fastened from a plurality of bolts 16, the value indicating the tightening strength of the bolt 16 determined to be the bolt 16 being fastened by the computer 22 is stepwise toward the target value. If it is increasing, it is judged as a step tightening. According to this configuration, it is possible to recommend to the operator to gradually increase the fastening torque of the bolt 16 in accordance with JISB2251.

In this case, the computer 22 causes the display device 24 to display a value indicating a plurality of tightening strengths corresponding to the plurality of bolts 16. According to this configuration, the operator can receive training in the fastening work while checking the current fastening torque of the bolt 16 on the display device 24. As a result, the fastening work can be performed while visually grasping the fastening force of the bolt 16, and more accurate training can be given to the operator.

[Third Embodiment]
With reference to FIG. 12, a method of discriminating the bolt 16 being fastened from the flange bolt fastening system 11 of the third embodiment and a plurality of bolts 16 using the same, and a third application method using the same will be described. .. In the present embodiment, in addition to the matters described in the first embodiment, the computer 22 has, for example, the difference between the maximum value and the minimum value and statistics from the value indicating the tightening strength of the plurality of bolts 16 to be fastened. Variation can be determined by a conventional method. Software (program) created based on the algorithm shown in the flowchart shown in FIG. 12 is installed in the hard disk drive 31 of the computer 22. The system 11 is an example of a device having a computer-readable recording medium on which the above program is recorded.

The hard disk drive 31 of the computer 22 stores a range and a predetermined range corresponding to desirable torque values of a plurality of volts. The range corresponding to the desired torque values of the plurality of bolts differs depending on the gasket type (gasket size, material, application, etc.). Therefore, the hard disk drive 31 stores the range in a form linked to the gasket type. For example, the range of desirable torque values for gasket A is in the range of 50.0 to 67.6 Nm centered on 58.8 Nm. Therefore, the predetermined range of desirable torque values for the gasket A is a range in which the difference between the maximum value and the minimum value of the plurality of torque values corresponding to the plurality of bolts is 17.6 Nm or less.

The range of desirable torque values for gasket B, which is different from gasket A, is in the range of 71.65 to 96.95 Nm centered on 84.3 Nm. Therefore, the predetermined range of desirable torque values for the gasket B is a range in which the difference between the maximum value and the minimum value of the plurality of torque values corresponding to the plurality of bolts is 25.3 Nm or less.

The range of desirable torque values for gasket C, which is different from gaskets A and B, is 58.15 to 78.65 Nm centered on 68.4 Nm. Therefore, the predetermined range of desirable torque values for the gasket C is a range in which the difference between the maximum value and the minimum value of the plurality of torque values corresponding to the plurality of bolts is 20.5 Nm or less. The hard disk drive 31 of the computer 22 stores the desired range (predetermined range) as described above in a form linked to the gasket type.

With reference to FIG. 12, a method of discriminating the bolt 16 being fastened from a plurality of bolts 16 used in the system 11 of the present embodiment and a third application method thereof will be described.

System 11 is started prior to the training for bolt fastening workers. The system 11 displays a message requesting input of the gasket (seal member 19) type on the display device 24, and prompts the operator to input the gasket type via the input unit 41 (step S51). .. After completing the input of the gasket type, the training will start. In the present embodiment, the start of the fastening operation is determined by detecting the torque value, but this determination method is an example. For example, the START button provided in the display screen displayed on the display device 24 is used. The computer 22 may grasp the start of the fastening operation by the operator's operation.

The sensor 18 (strain gauge) constantly measures the strain value of the bolt 16. The measuring device 21 acquires a strain value from the sensor 18 every 1 to 3 seconds, for example. The measuring device 21 stores the strain value thus obtained as a log every 1 to 3 seconds. The measuring device 21 stores a log of these strain values for each bolt 16. The software of the computer 22 acquires a log of the strain value from the measuring device 21, and calculates a log of the axial force value and a log of the torque value corresponding to the log of the strain value. On the other hand, when the measuring device 21 calculates the axial force value log and the torque value log based on the strain value log, the computer 22 (the software concerned) performs the axial force value log and the axial force value log together with the strain value log. You can get the log of the torque value.

As shown in step S52 of FIG. 12, the computer 22 determines, among the plurality of torque values corresponding to the obtained plurality of bolts 16, a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value. do. In the present embodiment, the computer 22 stores, for example, 1 to 5 Nm as a threshold value, and the threshold value can be appropriately set by the user according to the total number, diameter, length, and the like of the bolts 16. From the above log, the computer 22 determines the torque value corresponding to the candidate bolt 16 among the first to eighth bolts 16A to 16H. The number of candidate bolts 16 may be any number from 1 to 8.

When, for example, 2 to 4 torque values are determined in step S52, the computer 22 is in the process of fastening the bolt 16 corresponding to the torque value having the largest fluctuation among the 2 to 4 torque values. It is determined to be the bolt 16 and displayed on the display device 24 (step S53). By adopting such a discrimination method, the computer 22 can reliably discriminate the bolt 16 being operated.

Further, the computer 22 (the software) determines whether or not the fastening operation of the bolt 16 is completed (step S54). That is, when the computer 22 can detect a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value among the plurality of torque values corresponding to the obtained plurality of bolts 16, the bolt 16 is used. It is determined that the fastening operation has not been completed. In that case, the determination with the bolt 16 during the fastening operation is continued (steps S52 and S53). On the other hand, when the computer 22 cannot detect a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value among the plurality of torque values corresponding to the obtained plurality of bolts 16, the bolt 16 It is determined that the fastening operation is completed. In the present embodiment, the completion of the fastening operation is determined by the absence of detection of the torque value, but this determination method is an example, and is provided, for example, in the display screen displayed on the display device 24. The computer 22 may grasp the completion of the fastening operation by the operator operating the STOP button.

The computer 22 (the software) extracts the maximum value and the minimum value from the plurality of torque values corresponding to the plurality of bolts 16 (step S55). Further, the computer 22 calculates the difference between the maximum value and the minimum value, and determines whether or not the difference exceeds the predetermined range corresponding to the gasket type (step S68). When the difference exceeds the above-mentioned predetermined range corresponding to the gasket type, the computer 22 determines that the variation is large, and displays a message to that effect and a message indicating the corresponding bolt 16 on the display device 24 (step S57). ). In this case, the computer 22 displays a low evaluation as a proficiency level on the display device 24.

On the other hand, when the difference is within the above-mentioned predetermined range corresponding to the gasket type, the computer 22 determines that the variation is small, and displays a message to that effect on the display device 24 (step S58). In this case, the computer 22 displays a high evaluation as a proficiency level on the display device 24.

This completes the method of discriminating the bolt 16 being fastened from the plurality of bolts 16 and the third application method thereof. In this embodiment, a method of discriminating the bolt 16 during the fastening operation based mainly on the torque value and a third application method thereof are realized, but other values indicating the tightening strength corresponding to the bolt 16 are realized. A method of discriminating the bolt 16 based on an example axial force value and a third application method thereof may be realized.

According to this embodiment, the following can be said. In the method of determining the fastening state of a plurality of bolts, the maximum value and the minimum value are extracted from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts by the computer, and the difference between them is the difference. When the predetermined range is exceeded, it is determined that the variation is large.

The computer-readable recording medium on which the program is recorded extracts the maximum value and the minimum value among the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts by the computer, and the difference between them is the difference. A function for determining that the variation is large when the predetermined range is exceeded is realized.

According to these configurations, it is possible to grasp whether or not there is a variation in the value indicating the tightening strength together with the determination result of the bolt 16 during the fastening operation. This makes it possible to more accurately grasp the proficiency level of the worker. Then, this result can be used for the training of the worker.

The flange portion bolt fastening system 11 has a pair of flange portions and a gasket (seal member 19) sandwiched and held between the pair of flange portions, and determines the fastening state of a plurality of bolts. In the method, the computer has an input unit, and the predetermined range is set by the computer that receives an input of the type of the gasket (seal member 19) to the input unit.

Generally, the values (torque value, axial force value) indicating the appropriate tightening strength differ depending on the type of gasket (seal member 19). According to this configuration, a predetermined range of values indicating an appropriate tightening strength suitable for the gasket type is set, so that more accurate training can be performed.

As a method of determining the fastened state of a plurality of bolts, the computer 22 causes the display device 24 to display a message notifying that the predetermined range has been exceeded. According to this configuration, the worker who receives the training can easily recognize that the value indicating the tightening strength is out of the appropriate range. As a result, a high training effect for workers can be obtained.

[Fourth Embodiment]
With reference to FIG. 13, a method of discriminating the bolt 16 being fastened from the flange bolt fastening system 11 of the fourth embodiment and a plurality of bolts 16 using the same, and a fourth application method using the same will be described. .. In the present embodiment, in addition to the matters described in the first embodiment, the computer 22 obtains, for example, a maximum value from a value indicating the tightening strength of the plurality of bolts 16 to be fastened, or a statistical method. By adopting the above, it is possible to determine the presence or absence of the overtightened bolt 16. Software (program) created based on the algorithm shown in the flowchart shown in FIG. 13 is installed in the hard disk drive 31 of the computer 22. The system 11 is an example of a device having a computer-readable recording medium on which the above program is recorded.

The hard disk drive 31 of the computer 22 stores a range and a predetermined range corresponding to desirable torque values of a plurality of volts. The range corresponding to the desired torque values of the plurality of bolts differs depending on the type of gasket (seal member 19) (gasket size, material, application, etc.). Therefore, the hard disk drive 31 stores the range in a form linked to the gasket type. For example, the range of desirable torque values for gasket A is in the range of 50.0 to 67.6 Nm centered on 58.8 Nm. Further, the predetermined range of the desirable torque value for the gasket A is the range of 88.2 Nm or less, which is 1.5 times the most desirable torque value of 58.8 Nm.

The range of desirable torque values for gasket B, which is different from gasket A, is in the range of 71.65 to 96.95 Nm centered on 84.3 Nm. Further, the predetermined range of the desirable torque value for the gasket B is the range of 126.4 Nm or less, which is 1.5 times the most desirable torque value of 84.3 Nm.

The range of desirable torque values for gasket C, which is different from gaskets A and B, is 58.15 to 78.65 Nm centered on 68.4 Nm. Further, the predetermined range of the desirable torque value for the gasket C is the range of 102.6 Nm or less, which is 1.5 times the most desirable torque value of 68.4 Nm. The hard disk drive 31 of the computer 22 stores the desired range (predetermined range) as described above in a form linked to the gasket type.

With reference to FIG. 13, a method of discriminating the bolt 16 being fastened from a plurality of bolts 16 used in the system 11 of the present embodiment and a fourth application method thereof will be described.

System 11 is started prior to the training for bolt fastening workers. The system 11 displays a message requesting input of the gasket type on the display device 24, and prompts the operator to input the gasket type via the input unit 41 (step S61). After completing the input of the gasket type, the training will start. In the present embodiment, the start of the fastening operation is determined by detecting the torque value, but this determination method is an example. For example, the START button provided in the display screen displayed on the display device 24 is used. The computer 22 may grasp the start of the fastening operation by the operator's operation.

As shown in step S62 of FIG. 13, the computer 22 determines, among the plurality of torque values corresponding to the obtained plurality of bolts 16, a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value. do. In the present embodiment, the computer 22 stores, for example, 1 to 5 Nm as a threshold value, and the threshold value can be appropriately set by the user according to the total number, diameter, length, and the like of the bolts 16. From the above log, the computer 22 determines the torque value corresponding to the candidate bolt 16 among the first to eighth bolts 16A to 16H. The number of candidate bolts 16 may be any number from 1 to 8.

When, for example, 2 to 4 torque values are determined in step S62, the computer 22 is in the process of fastening the bolt 16 corresponding to the torque value having the largest fluctuation among the 2 to 4 torque values. It is determined to be the bolt 16 and displayed on the display device 24 (step S63). By adopting such a discrimination method, the computer 22 can reliably discriminate the bolt 16 being operated.

Further, the computer 22 (the software concerned) determines whether or not the fastening operation of the bolt 16 is completed (step S64). That is, when the computer 22 can detect a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value among the plurality of torque values corresponding to the obtained plurality of bolts 16, the bolt 16 is used. It is determined that the fastening operation has not been completed. In that case, the determination with the bolt 16 during the fastening operation is continued (steps S62 and S63). On the other hand, when the computer 22 cannot detect a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value among the plurality of torque values corresponding to the obtained plurality of bolts 16, the bolt 16 It is determined that the fastening operation is completed. In the present embodiment, the completion of the fastening operation is determined by the absence of detection of the torque value, but this determination method is an example, and is provided, for example, in the display screen displayed on the display device 24. The computer 22 may grasp the completion of the fastening operation by the operator operating the STOP button.

The computer 22 (the software) extracts the maximum value from the plurality of torque values corresponding to the plurality of bolts 16 (step S65). Further, the computer 22 determines whether or not the maximum value exceeds the predetermined range corresponding to the gasket type (step S66). When the maximum value exceeds the above-mentioned predetermined range corresponding to the gasket type, the computer 22 determines that there is excessive tightening, and displays a message to that effect and a message indicating the corresponding bolt 16 on the display device 24. (Step S67). In this case, the computer 22 displays a low evaluation as a proficiency level on the display device 24.

On the other hand, when the difference is within the above-mentioned predetermined range corresponding to the gasket type, the computer 22 determines that there is no excessive tightening, and displays a message to that effect on the display device 24 (step S68). In this case, the computer 22 displays a high evaluation as a proficiency level on the display device 24. In the present embodiment, the presence or absence of excessive tightening is determined after the fastening operation is completed, but this determination is not limited to the completion of the fastening operation. Of course, the determination may be made in real time when the worker is performing the fastening operation.

This completes the method of discriminating the bolt 16 being fastened from the plurality of bolts 16 and the fourth application method thereof. In this embodiment, a method of discriminating the bolt 16 during the fastening operation based mainly on the torque value and a fourth application method thereof are realized, but other values indicating the tightening strength corresponding to the bolt 16 are realized. A method of discriminating the bolt 16 based on an example axial force value and a fourth application method thereof may be realized.

According to this embodiment, the following can be said. In the method of determining the fastening state of a plurality of bolts, the maximum value is extracted from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts by the computer, and the maximum value exceeds a predetermined range. If this is the case, it is determined that there is excessive tightening.

The computer-readable recording medium on which the program is recorded extracts the maximum value from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts by the computer, and the maximum value exceeds a predetermined range. In this case, the function of determining that there is excessive tightening is realized.

According to these configurations, it is possible to grasp whether or not there is excessive tightening together with the determination result of the bolt 16 during the fastening operation. This makes it possible to more accurately grasp the proficiency level of the worker. Then, this result can be used for the training of the worker.

[Fifth Embodiment]
With reference to FIG. 14, a method of discriminating the bolt 16 being fastened from the flange bolt fastening system 11 of the fifth embodiment and a plurality of bolts 16 using the same, and a fifth application method using the same will be described. .. In the present embodiment, in addition to the matters described in the first embodiment, the computer 22 obtains, for example, a minimum value from a value indicating the tightening strength of the plurality of bolts 16 to be fastened, or a statistical method. By adopting the above, it is possible to determine the presence or absence of the bolt 16 having insufficient tightening force. Software (program) created based on the algorithm shown in the flowchart shown in FIG. 14 is installed in the hard disk drive 31 of the computer 22. The system 11 is an example of a device having a computer-readable recording medium on which the above program is recorded.

The hard disk drive 31 of the computer 22 stores a range and a predetermined range corresponding to desirable torque values of a plurality of volts. The range corresponding to the desired torque values of the plurality of bolts differs depending on the type of gasket (seal member 19) (gasket size, material, application, etc.). Therefore, the hard disk drive 31 stores the range in a form linked to the gasket type. For example, the range of desirable torque values for gasket A is in the range of 50.0 to 67.6 Nm centered on 58.8 Nm. Further, the predetermined range of the desirable torque value for the gasket A is a range of 45.2 Nm or more at which the tightening force is not insufficient.

The range of desirable torque values for gasket B, which is different from gasket A, is in the range of 71.65 to 96.95 Nm centered on 84.3 Nm. Further, the predetermined range of the desirable torque value for the gasket B is a range of 64.3 Nm or more at which the tightening force is not insufficient.

The range of desirable torque values for gasket C, which is different from gaskets A and B, is 58.15 to 78.65 Nm centered on 68.4 Nm. Further, the predetermined range of the desirable torque value for the gasket C is a range of 52.6 Nm or more at which the tightening force is not insufficient. The hard disk drive 31 of the computer 22 stores the desired range (predetermined range) as described above in a form linked to the gasket type.

With reference to FIG. 14, a method of discriminating the bolt 16 being fastened from a plurality of bolts 16 used in the system 11 of the present embodiment and a third application method thereof will be described.

System 11 is started prior to the training for bolt fastening workers. The system 11 displays a message requesting input of the gasket type on the display device 24, and prompts the operator to input the gasket type via the input unit 41 (step S71). After completing the input of the gasket type, the training will start. In the present embodiment, the start of the fastening operation is determined by detecting the torque value, but this determination method is an example. For example, the START button provided in the display screen displayed on the display device 24 is used. The computer 22 may grasp the start of the fastening operation by the operator's operation.

As shown in step S72 of FIG. 14, the computer 22 determines, among the plurality of torque values corresponding to the obtained plurality of bolts 16, a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value. do. In the present embodiment, the computer 22 stores, for example, 1 to 5 Nm as a threshold value, and the threshold value can be appropriately set by the user according to the total number, diameter, length, and the like of the bolts 16. From the above log, the computer 22 determines the torque value corresponding to the candidate bolt 16 among the first to eighth bolts 16A to 16H. The number of candidate bolts 16 may be any number from 1 to 8.

When, for example, 2 to 4 torque values are determined in step S72, the computer 22 is in the process of fastening the bolt 16 corresponding to the torque value having the largest fluctuation among the 2 to 4 torque values. It is determined to be the bolt 16 and displayed on the display device 24 (step S73). By adopting such a discrimination method, the computer 22 can reliably discriminate the bolt 16 being operated.

Further, the computer 22 (the software concerned) determines whether or not the fastening operation of the bolt 16 is completed (step S74). That is, when the computer 22 can detect a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value among the plurality of torque values corresponding to the obtained plurality of bolts 16, the bolt 16 is used. It is determined that the fastening operation has not been completed. In that case, the determination with the bolt 16 during the fastening operation is continued (steps S72 and S73). On the other hand, when the computer 22 cannot detect a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value among the plurality of torque values corresponding to the obtained plurality of bolts 16, the bolt 16 It is determined that the fastening operation is completed. In the present embodiment, the completion of the fastening operation is determined by the absence of detection of the torque value, but this determination method is an example, and is provided, for example, in the display screen displayed on the display device 24. The computer 22 may grasp the completion of the fastening operation by the operator operating the STOP button.

The computer 22 (the software) extracts the minimum value from the plurality of torque values corresponding to the plurality of bolts 16 (step S75). Further, the computer 22 determines whether or not the minimum value is below the predetermined range corresponding to the gasket type (step S76). When the minimum value is less than the above-mentioned predetermined range corresponding to the gasket type, the computer 22 determines that the tightening force is insufficient, and displays a message to that effect and a message indicating the corresponding bolt 16 on the display device 24. (Step S77). In this case, the computer 22 displays a low evaluation as a proficiency level on the display device 24.

On the other hand, when the difference is within the above-mentioned predetermined range corresponding to the gasket type, the computer 22 determines that there is no insufficient tightening force, and displays a message to that effect on the display device 24 (step S78). .. In this case, the computer 22 displays a high evaluation as a proficiency level on the display device 24. In the present embodiment, it is determined whether or not the tightening force is insufficient after the fastening operation is completed, but this determination is not limited to the completion of the fastening operation. Of course, the determination may be made in real time when the worker is performing the fastening operation.

This completes the method of discriminating the bolt 16 being fastened from the plurality of bolts 16 and the fifth application method thereof. In this embodiment, a method of discriminating the bolt 16 during the fastening operation based mainly on the torque value and a fifth application method thereof are realized, but other values indicating the tightening strength corresponding to the bolt 16 are realized. A method of discriminating the bolt 16 based on an example axial force value and a fifth application method thereof may be realized.

According to this embodiment, the following can be said. In the method of determining the fastening state of a plurality of bolts, the minimum value is extracted from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts by the computer, and the minimum value is below a predetermined range. In some cases, it is determined that the tightening force is insufficient.

The computer-readable recording medium on which the program is recorded extracts the minimum value from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts by the computer, and the minimum value falls below a predetermined range. In some cases, the function of determining that the tightening force is insufficient is realized.

According to these configurations, it is possible to grasp whether or not there is insufficient tightening force together with the determination result of the bolt 16 during the fastening operation. This makes it possible to more accurately grasp the proficiency level of the worker. Then, this result can be used for the training of the worker.

[Sixth Embodiment]
With reference to FIG. 15, a method of discriminating the bolt 16 being fastened from the flange bolt fastening system 11 of the sixth embodiment and a plurality of bolts 16 using the same, and a sixth application method using the same will be described. .. This embodiment is a modified example in which the first embodiment is partially modified. In the present embodiment, for example, the computer 22 intentionally displays the discrimination result of discriminating the bolt 16 being fastened from the plurality of bolts 16 on the display device 24 in real time based on the selection of the advanced mode by the worker who receives the training. It is possible to perform processing that is not displayed. Software (program) created based on the algorithm shown in the flowchart shown in FIG. 15 is installed in the hard disk drive 31 of the computer 22.

Subsequently, with reference to FIG. 15, a method of discriminating the bolt 16 being fastened from the plurality of bolts 16 used in the system 11 of the present embodiment and a first application method thereof will be described.

As shown in step S81 of FIG. 15, the computer 22 determines, among the plurality of torque values corresponding to the obtained plurality of bolts 16, a plurality of torque values that fluctuate in a direction of increasing beyond a predetermined threshold value. do. In the present embodiment, the computer 22 stores, for example, 1 to 5 Nm as a threshold value, and the threshold value can be appropriately set by the user according to the total number, diameter, length, and the like of the bolts 16. From the above log, the computer 22 determines the torque value corresponding to the candidate bolt 16 among the first to eighth bolts 16A to 16H. The number of candidate bolts 16 may be any number from 1 to 8.

When, for example, 2 to 4 torque values are determined in step S81, the computer 22 is in the process of fastening the bolt 16 corresponding to the torque value that fluctuates most among the 2 to 4 torque values. It is determined to be the bolt 16 (step S82). By adopting such a discrimination method, the computer 22 can reliably discriminate the bolt 16 being operated. In the present embodiment, the computer 22 turns off the display function of the display device 24 while the operator is performing the bolt 16 fastening operation. Therefore, the computer 22 does not display the bolt determination result during the fastening operation on the display device 24 in real time.

In the present embodiment, the computer 22 (software) can determine the number of bolt tightening laps in addition to the determination of the bolt 16 during the fastening operation. The computer 22 certifies the bolt 16 to which the operator first fastens as a reference bolt. When it is determined that a predetermined number of bolts 16 including the reference bolt among the plurality of bolts 16 have been fastened, the computer 22 determines that the number of laps is 1 (step S83). At that time, the predetermined number may be 1 or more, and an appropriate number can be set, for example, 2 to 6, preferably 3 to 5.

It will be explained below assuming that 4 is set as a predetermined number. The operator first fastens the first bolt 16A, fastens the second bolt 16B, then fastens the third bolt 16C, fastens the fourth bolt 16D, and fastens the fifth bolt 16E. Suppose you did. At that time, the computer 22 determines that the number of laps is 1. The order of fastening operations of the 2nd to 5th bolts 16B to 16E does not matter, and even if the fastening operations are performed in an order other than the order of arrangement, if the four bolts 16 are fastened, the number of laps is 1. Is determined.

Even when the operator subsequently fastens the 6th bolt 16F, the 7th bolt 16G, and the 8th bolt 16H, the number of laps of 1 is maintained. Next, when the operator fastens the first bolt 16A, which is the reference bolt, again, the number of laps is added by 1 to 2 (step S84). When the operator operates the bolt 16 other than the reference bolt, the number of laps 2 is maintained. After that, when the operator performs the fastening operation to the first bolt 16A, which is the reference bolt, the number of laps is increased by one.

The computer 22 (the software) confirms whether or not the bolt 16 fastening operation has been completed, as shown in step S85 of FIG. The confirmation may be performed, for example, by receiving an input of the work completion from the operator to the computer 22 after the completion of the fastening work, or it is determined that the computer 22 is completed when the bolt is not operated for a predetermined time. May be good. If the fastening work is completed, the process proceeds to the next step S86. If the fastening work is not completed, the process returns to step S81.

In step S86, the computer 22 (the software) can display the display in time series of the bolt 16 for which the fastening operation has been performed on the display device 24. The time-series display of the bolt 16 for which the fastening operation has been performed may be a presentation of a table (for example, a table as shown in FIG. 5) summarizing the logs of the bolt 16 for which the fastening operation has been performed. In the image showing the image of the bolt 16 as shown in FIGS. 6 and 7, which bolt 16 is fastened is surrounded by a thick frame, and a value indicating the tightening strength of the bolt 16 at that time (torque value, It may be a reproduction of an animation in which the axial force value etc.) is displayed and the animation is shown in order in chronological order.

The computer 22 determines the proficiency level of the worker according to the number of laps and the fastening operation time. For example, when the number of laps is 2 or more, the computer 22 displays on the display device 24 that the worker has a high proficiency level (step S87). On the other hand, when the number of laps is 1 or the number of laps is excessively large (for example, 5 or more), the display device 24 indicates that the worker has a low proficiency level (step S87). This completes the method of discriminating the bolt 16 being fastened from the plurality of bolts 16 and the sixth application method thereof. In this embodiment, a method of discriminating the bolt 16 during the fastening operation based mainly on the torque value and a sixth application method thereof are realized, but other values indicating the tightening strength corresponding to the bolt 16 are realized. A method of discriminating the bolt 16 based on an example axial force value and a sixth application method thereof may be realized.

In this embodiment, as a modification of the first embodiment, the determination result of the bolt 16 for which the fastening operation has been performed and the number of laps of the fastening operation are hidden until the fastening operation is completed. Is not limited to this.

For example, in the second embodiment described above, based on the user's selection, the computer 22 (the software) determines the bolt 16 for which the fastening operation has been performed, the presence / absence of diagonal tightening, the total number of diagonal pairs, and the diagonal. The presence / absence of step tightening, the presence / absence of circumferential tightening, the total number of occurrences of circumferential pairs, the presence / absence of circumferential step tightening, and the fastening operation time are hidden until the fastening operation is completed, and the display device is displayed after the fastening operation is completed. It may be displayed on 24. Among them, the determination result of the bolt 16 for which the fastening operation has been performed may be displayed on the display device 24 in chronological order.

Similarly, for example, in the third to fifth embodiments described above, the computer 22 (the software) hides various results until the fastening operation is completed, and the display device is displayed after the fastening operation is completed, based on the user's selection. It may be displayed on 24. Among them, the determination result of the bolt 16 for which the fastening operation has been performed may be displayed on the display device 24 in chronological order.

According to this embodiment and the above modifications, the following can be said. The method of determining the bolt 16 being fastened from the plurality of bolts 16 is based on the user's selection, the display function of the display device 24 is turned off by the computer 22, and the fastening operation is performed after the fastening operation of the plurality of bolts 16 is completed. The determination result of the bolt 16 performed is displayed on the display device 24 in chronological order.

According to this configuration, when the worker who receives the training is an advanced person, he / she can receive the training of the fastening work without displaying the bolt 16 during the fastening operation on the display device 24. As a result, it is possible to receive more advanced training and to receive a skill (proficiency level) determination without depending on the screen of the display device 24. Further, according to the above configuration, after the bolt 16 fastening operation is completed, the determination result of the bolt 16 that has been fastened to the display device 24 can be displayed in chronological order. As a result, the worker who receives the training or the like can confirm whether or not the procedure for fastening the bolt 16 is appropriate after the work is completed.

[7th Embodiment]
With reference to FIGS. 16 and 17, a method of discriminating the bolt 16 being loosened from the flange bolt fastening system 11 of the seventh embodiment and a plurality of bolts 16 using the same, and an application method using the same will be described. do. This embodiment is a modified example in which the first embodiment is partially modified. In the present embodiment, unlike the above embodiment, the bolt 16 during the tightening operation is not determined, but the bolt 16 during the loosening operation in which the operator is performing the loosening operation is determined. Software (program) created based on the algorithm shown in the flowchart or the like shown in FIG. 17 is installed in the hard disk drive 31 of the computer 22. The system 11 is an example of a device having a computer-readable recording medium on which the above program is recorded.

It is not desirable for the loosening operation performed by the operator to loosen at once so that the torque value of the bolt 16 becomes zero.

That is, as shown in FIG. 2, when the first to eighth bolts 16A to 16H are fastened to the first flange portion 14 and the second flange portion 15 with appropriate torque values, the seventh bolt 16G is attached. It is assumed that the torque value is loosened so as to decrease. In that case, as shown in the graph of FIG. 16, the torque value of the 7th bolt 16G is reduced, whereby the repulsive force generated between the first flange portion 14 and the second flange portion 15 is released. As a result, the torque values (axial force values) of the 6th bolt 16F and the 8th bolt 16H located around the 7th bolt 16G increase. This is called the elastic interaction of bolts. For example, as shown in FIG. 16, if the torque value of the 7th bolt 16G is loosened at once so as to be zero, the torque values of the 6th bolt 16F and the 8th bolt 16H are about 26 due to the elastic interaction. % (In FIG. 16, the loosening start time and the loosening end time of the 7th bolt 16G are shown by a two-dot chain line). In the graph of FIG. 16, as an example for explaining the elastic interaction, the torque value is loosened at once so that the torque value becomes zero in the order of the 7th bolt 16G, the 6th bolt 16F, and the 8th bolt 16H. Shows the case.

In this way, when one bolt 16 is loosened, the torque value of the bolts 16 adjacent to the periphery increases due to the elastic interaction of the bolts. Therefore, the bolt 16 is temporarily loosened in order in the circumferential direction. When the bolts 16 are loosened in order in the circumferential direction along the order of arrangement, the torque value of the bolts 16 located on the front side in the circumferential direction increases each time one bolt 16 is loosened. As a result, before the final loosening of the bolt 16 is completed, the torque value becomes too high due to the elastic interaction, and finally the operator cannot turn the bolt 17. Therefore, when loosening the bolt 16 that has already been fastened as in the present embodiment, it is desirable not to loosen the bolt 16 at once but to loosen it gradually.

Subsequently, with reference to FIG. 17 and the like, a method for discriminating the bolt 16 being loosened from the plurality of bolts 16 used in the system 11 of the present embodiment, an application method thereof, and a program (software) for executing them. explain.

In the present embodiment, unlike the above embodiment, all of the plurality of bolts 16 are fastened to the first flange portion 14 and the second flange portion 15 with appropriate torque values before the start of the training. ..

Prior to the training for workers to loosen bolts, start the system 11 and computer 22 (software). The sensor 18 (strain gauge) constantly measures the strain value of the bolt 16. The measuring device 21 acquires a strain value from the sensor 18 every 1 to 3 seconds, for example. The measuring device 21 stores the strain value thus obtained as a log every 1 to 3 seconds. The measuring device 21 stores a log of these strain values for each bolt 16. The software of the computer 22 acquires a log of the strain value from the measuring device 21, and calculates a log of the axial force value and a log of the torque value corresponding to the log of the strain value.

The computer 22 determines a plurality of torque values that fluctuate in a direction of decreasing beyond a predetermined threshold value among the plurality of torque values corresponding to the obtained plurality of bolts 16. In the present embodiment, the computer 22 stores, for example, 1 to 5 Nm as a threshold value, and the threshold value can be appropriately set by the user according to the total number, diameter, length, and the like of the bolts 16. The computer 22 determines the torque value corresponding to the candidate bolt 16 among the first to eighth bolts 16A to 16H from the log acquired by the computer 22. The number of candidate bolts 16 may be any number from 1 to 8.

The size of this threshold is arbitrary. If the threshold value is smaller than the above range, the candidates for the bolt 16 during the loosening operation cannot be selected well. If the threshold value becomes larger than the above range, it leads to the failure to detect the bolt 16 that is actually loosening.

When, for example, 2 to 4 torque values are determined in step S91, the computer 22 is in the process of loosening the bolt 16 corresponding to the torque value having the largest fluctuation among the 2 to 4 torque values. It is determined to be the bolt 16 (step S92). By adopting such a discrimination method, the computer 22 can surely discriminate the bolt 16 during the loosening operation.

Further, the computer 22 (the software) displays this determination result on the display device 24 (step S92). The images for displaying the determination result on the display device 24 are substantially the same as those in FIGS. 6 and 7.

When the computer 22 determines that the loosening work of the first bolt 16A is currently being performed according to steps S91 and S92, the computer 22 surrounds the image (icon) of the first bolt 16A with a thick square frame and emphasizes it (Fig.). 6). Next, when it is determined that the fifth bolt 16E is being loosened, the image (icon) of the fifth bolt 16E is surrounded by a thick square frame and emphasized (see FIG. 7). The computer 22 displays, for example, a torque value or an axial force value, which is a value indicating the current tightening strength of the bolt 16, in or near the image (icon) of the first to eighth bolts 16A to 16H of the display device 24. It can be displayed (step S92). As shown in FIGS. 6 and 7, the magnitude of the torque value or the axial force value may be expressed by the color or pattern of the bar in the image, or may be directly expressed by a numerical value or the like.

As a result, the trained worker can perform the loosening operation of the bolt 16 while checking the torque value or the axial force value of the bolt 16 currently being operated. The operator can proceed with the loosening work while checking the number and the like of the bolt 16 being loosened on the display device 24.

In the present embodiment, the computer 22 (software) may determine the number of bolt tightening laps in addition to the determination of the bolt 16 during the fastening operation. The computer 22 certifies the bolt 16 to which the operator first fastens as a reference bolt. When it is determined that a predetermined number of bolts including the reference bolt among the plurality of bolts 16 have been loosened, the computer 22 determines that the number of laps is 1 (step S13). At that time, the predetermined number is 1 or more, and an appropriate number can be set.

It will be explained below assuming that 4 is set as a predetermined number. The operator first loosens the 1st bolt 16A, then loosens the 5th bolt 16E, then loosens the 2nd bolt 16B, then loosens the 6th bolt 16F, and then the second bolt. It is assumed that the 3 bolt 16C is loosened and operated. At that time, the computer 22 (the software) determines that the number of laps is 1. The order of fastening operations of the 1st to 3rd bolts 16A to 16C, the 5th bolt 16E, and the 6th bolt 16F does not matter, and even if the fastening operations are performed in an order other than the order of arrangement, the four bolts are used. If 16 is fastened, the number of laps is determined to be 1.

The computer 22 (the software) maintains 1 lap even when the operator subsequently loosens and operates the 7th bolt 16G, the 4th bolt 16D, and the 8th bolt 16H. Next, when the operator loosens and operates the first bolt 16A, which is the reference bolt, the computer 22 (the software) adds 1 to 2 laps (step S94). When the operator operates the bolt 16 other than the reference bolt, the number of laps 2 is maintained. After that, when the operator loosens the first bolt 16A, which is the reference bolt, the computer 22 (the software) increases the number of laps by one. The computer 22 displays the number of laps on the display device 24 at any timing during the loosening operation of the bolt 16 and after the loosening operation of the bolt 16 is completed (step S95). This step S95 is an optional step and may or may not be performed.

The operator can confirm that the torque value or the axial force value of the bolt 16 is within the range of the appropriate value, and can complete the tightening of the bolt 16. After the completion, the operator can confirm the number of laps together with the torque value or the axial force value of each bolt 16 after the tightening is completed on the display screen of the display device 24. Even when a number other than 4 is set as the predetermined number, the number of laps is determined in the same manner as described above, and the number of laps is displayed on the display device 24. Further, the computer 22 determines the proficiency level and the comment of the worker according to the number of laps and the fastening operation time. For example, when the number of laps is 2 or more, the computer 22 displays on the display device 24 that the worker is at a high proficiency level (step S96). On the other hand, when the number of laps is 1, the display device 24 indicates that the worker is at a low proficiency level (step S96). The shorter the loosening operation time, the higher the evaluation. When the loosening operation time exceeds the standard working time, the computer 22 (the software) displays the proficiency level low and displays the following comment (message) on the display device 24. Can be done.
"Careful construction is preferable, but more familiarity with the procedure is expected to improve work efficiency."

Note that this step S96 is an optional step and may or may not be performed.

Further, the computer 22 (the software) determines that the bolts 16 which have been loosened in order are gradually (stepwise) loosened diagonally, that is, whether or not the bolts 16 have been loosened diagonally. May be good. That is, it may be determined whether or not the bolts 16 that have been loosened in order are in diagonal positions.
For example, when the total number of bolts 16 is 8, the computer 22 recognizes them as diagonal pairs when the difference between the bolt numbers of the bolts 16 is 4. If the diagonal pair is not recognized, it is judged that the diagonal pair is not loosened.
Further, the computer 22 determines whether or not there are two or more different diagonal pairs. If there are two or more different diagonal pairs, the computer 22 determines that the diagonal is loose. If the number of different diagonal pairs is 1 or less, the computer 22 can determine that the diagonal is not loose. It should be noted that the determination as to whether or not this diagonal loosening is performed is an optional step and may or may not be performed.

This completes the method of discriminating the bolt 16 being loosened from the plurality of bolts 16 and the application method thereof. In this embodiment, a method of discriminating the bolt 16 being loosened mainly based on a torque value and an application method thereof are realized, but other examples of values indicating the tightening strength corresponding to the bolt 16 are used. A method of discriminating the bolt 16 based on a certain axial force value and an application method thereof may be realized.

According to this embodiment, the following can be said. A flange bolt fastening system 11 was used as a method for discriminating the bolt being loosened from a plurality of bolts. The flange bolt fastening system 11 is a plurality of sensors 18 for measuring strain values of a plurality of bolts 16 capable of fastening a pair of flange portions, and a plurality of strain values obtained from the plurality of sensors 18. A computer 22 for acquiring a plurality of tightening strength values corresponding to the bolt 16 and a display device 24 for displaying the plurality of tightening strength values are provided. The method of discriminating the bolt being loosened from a plurality of bolts is a value indicating a plurality of tightening strengths which are varied in a direction of decreasing beyond a predetermined threshold value among the values indicating the plurality of tightening strengths by the computer 22. The computer 22 determines that the bolt 16 corresponding to the value indicating the largest variation in the tightening strength among the values indicating the plurality of tightening strengths fluctuating in the decreasing direction is the bolt 16 being operated. ..

The computer-readable recording medium on which the program is recorded realizes the following functions in the flange bolt fastening system 11. The flange bolt fastening system 11 is a plurality of sensors 18 for measuring strain values of a plurality of bolts 16 capable of fastening a pair of flange portions, and a plurality of strain values obtained from the plurality of sensors 18. A computer 22 for acquiring a plurality of tightening strength values corresponding to the bolt 16 and a display device 24 for displaying the plurality of tightening strength values are provided. The computer-readable recording medium has a function of discriminating a plurality of values indicating a plurality of tightening strengths, which are varied in a direction of decreasing beyond a predetermined threshold value, among the values indicating the plurality of tightening strengths by the computer 22, and a computer. 22 realizes a function of loosening the bolt 16 corresponding to the value indicating the most greatly fluctuating tightening strength among the values indicating the plurality of tightening strengths fluctuating in the decreasing direction and discriminating the bolt 16 from the bolt 16 being operated. Recorded the program to be made.

According to these configurations, the computer 22 can accurately determine the bolt 16 that the operator is currently loosening and operating. As a result, accurate logs can be taken on the computer 22, which can be effectively used for subsequent analysis using the system 11 (whether a stepwise loosening operation is possible, etc.).

Further, according to the above configuration, the operator who performs the bolt loosening operation can proceed with the loosening work while confirming the number and position of the bolt 16 actually loosened on the screen of the display device 24. As a result, the operator can learn the loosening work of the bolt 16 while confirming on the screen that the bolt 16 to be loosened is correctly loosened. If the computer 22 displays on the display device 24 a value indicating the current plurality of tightening strengths of the bolt 16 currently being loosened, the operator displays the current plurality of tightening strengths. You can proceed with the work while checking the indicated values. It can also be used to determine the worker's current skill (proficiency level).

The computer 22 acquires a value indicating the plurality of tightening strengths from the plurality of strain values at predetermined time intervals. According to this configuration, the working time can be notified to the operator together with the determination result of the bolt 16 during the loosening operation. As a result, it is possible to encourage the worker to finish the work in a short time, and it is possible to teach the loosening work of the bolt 16 while improving the work efficiency. It can also be used to determine the worker's current skill (proficiency level).

The above embodiment can be implemented by adding various replacements and modifications. Further, it is possible to realize one invention by appropriately combining the above-described embodiments, and it is naturally possible to realize one invention by combining all of the above-described embodiments.

11 System 12 1st pipe 13 2nd pipe 14 1st flange 15 2nd flange 16 Bolt 17 Nut 18 Sensor 19 Sealing member 21 Measuring device 22 Computer 23 Server 24 Display device 31 Hard disk drive 41 Input section

Claims

A plurality of sensors for measuring the strain values of a plurality of bolts capable of fastening a pair of flanges, and a plurality of tightening strengths corresponding to the plurality of bolts obtained from the plurality of strain values obtained by the plurality of sensors. A method of discriminating a bolt being fastened from a plurality of bolts by using a flange bolt fastening system including a computer for acquiring a value indicating a value indicating There,
Among the values indicating the plurality of tightening strengths, the computer determines a value indicating a plurality of tightening strengths that fluctuate in a direction of increasing beyond a predetermined threshold value.
From a plurality of bolts that determine the bolt corresponding to the value indicating the largest variation in the tightening strength among the values indicating the plurality of tightening strengths fluctuating in the increasing direction by the computer as the bolt being fastened. How to determine which bolt is being fastened.
The computer is a method of discriminating a bolt during a fastening operation from a plurality of bolts according to claim 1, wherein the computer acquires a value indicating the plurality of tightening strengths from the plurality of strain values at predetermined time intervals.
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
The computer recognizes the bolt to which the fastening operation is first performed as a reference bolt, and when it is determined that a predetermined number of the bolts including the reference bolt among the plurality of bolts have been fastened, the number of laps is 1. A method of discriminating a bolt being fastened from a plurality of bolts according to claim 1 or 2, wherein the number of laps is increased by 1 for each tightening operation of the reference bolt thereafter.
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
When the bolt being fastened by the computer and the bolt to be fastened immediately before it are in diagonal positions, it is recognized as a diagonal pair, and when two or more diagonal pairs are certified, diagonal tightening is performed. A method for discriminating a bolt during a fastening operation from a plurality of bolts according to any one of claims 1 to 3.
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
When the bolt that is being fastened by the computer and the bolt that was fastened immediately before it are adjacent to each other along the arrangement direction of the plurality of bolts, it is recognized as a circumferential pair and two or more circumferential pairs. A method for discriminating a bolt during a fastening operation from a plurality of bolts according to any one of claims 1 to 4, which is determined to be circumferential tightening when the bolt is certified.
4. Claim 4 or claim, wherein when the value indicating the tightening strength of the bolt determined to be the bolt during the fastening operation by the computer is gradually increased toward the target value, it is determined to be step tightening. A method for discriminating a bolt during a fastening operation from a plurality of bolts according to 5.
After all the fastening operations of the plurality of bolts are completed, the computer extracts the maximum value and the minimum value among the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts, and the difference between them. The method for determining the fastening state of a plurality of bolts according to any one of claims 1 to 6, wherein it is determined that the variation is large when the amount exceeds a predetermined range.
The computer extracts the maximum value from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts, and when the maximum value exceeds a predetermined range, it is determined that excessive tightening is present. Item 8. A method for determining a fastening state of a plurality of bolts according to any one of Items 1 to 7.
The computer extracts the minimum value from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts, and when the minimum value is below a predetermined range, it is determined that the tightening force is insufficient. Item 8. A method for determining a fastening state of a plurality of bolts according to any one of Items 1 to 8.
The flange bolt fastening system has a pair of flanges and a gasket that is sandwiched and held between the pair of flanges.
The computer has an input unit.
The method for determining the fastening state of a plurality of bolts according to any one of claims 7 to 9, wherein the predetermined range is set by the computer that receives the input of the gasket type to the input unit.
The method for determining the fastened state of a plurality of bolts according to any one of claims 7 to 10, wherein a message notifying that the computer is out of the predetermined range is displayed on the display device.
A method of discriminating a bolt being fastened from a plurality of bolts according to any one of claims 1 to 11 in which the display device displays the discriminating result of the bolt being fastened by the computer.
The fastening operation is being performed from the plurality of bolts according to any one of claims 1 to 12, wherein the computer measures the time from the start to the completion of the fastening operation of the plurality of bolts and displays the measurement result on the display device. How to determine the bolt of.
A method of discriminating a bolt being fastened from a plurality of bolts according to any one of claims 1 to 13 in which a proficiency level is displayed on the display device by the computer.
A method of discriminating a bolt being fastened from a plurality of bolts according to any one of claims 1 to 14 for displaying a comment on a worker's fastening operation on the display device by the computer.
Based on the user's selection, the display function of the display device is turned off by the computer, and after the fastening operation of the plurality of bolts is completed, the determination result of the bolt for which the fastening operation is performed is displayed on the display device in chronological order. A method for discriminating a bolt during a fastening operation from a plurality of bolts according to any one of claims 1 to 15.
A plurality of sensors for measuring the strain values of a plurality of bolts capable of fastening a pair of flanges, and a plurality of tightening strengths corresponding to the plurality of bolts obtained from the plurality of strain values obtained by the plurality of sensors. A computer-readable recording medium in which a program for realizing the following functions is recorded in a flange bolt fastening system including a computer for acquiring a value indicating a value indicating the above and a display device for displaying a plurality of values indicating a tightening strength. And,
Among the values indicating the plurality of tightening strengths by the computer, a function of discriminating a plurality of values indicating a plurality of tightening strengths that fluctuate in a direction of increasing beyond a predetermined threshold value.
The computer realizes a function of discriminating the bolt corresponding to the value indicating the most fluctuating tightening strength among the values indicating the plurality of tightening strengths fluctuating in the increasing direction as the bolt being fastened. A computer-readable recording medium on which the program to be recorded is recorded.
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
The computer recognizes the bolt that was first fastened as a reference bolt, and then recognizes it as a reference bolt.
When it is determined that a predetermined number of the bolts including the reference bolt have been fastened among the plurality of bolts, the number of laps is determined as 1, and thereafter, the number of laps is set to 1 for each fastening operation of the reference bolt. A computer-readable recording medium on which the program according to claim 17 is realized, which realizes a function of increasing the number of increments.
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
When the bolt being fastened by the computer and the bolt to be fastened immediately before it are in diagonal positions, it is recognized as a diagonal pair, and when two or more diagonal pairs are certified, diagonal tightening is performed. A computer-readable recording medium on which the program according to claim 17 or 18.
The plurality of bolts are arranged discretely in an annular shape with respect to the pair of flange portions.
When the bolt that is being fastened by the computer and the bolt that was fastened immediately before it are adjacent to each other along the arrangement direction of the plurality of bolts, it is recognized as a circumferential pair and two or more circumferential pairs. A computer-readable recording medium on which the program according to any one of claims 17 to 19 is recorded, which realizes a function of determining the circumferential tightening when is certified.
After all the fastening operations of the plurality of bolts are completed, the computer extracts the maximum value and the minimum value among the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts, and the difference between them. A computer-readable recording medium on which the program according to any one of claims 17 to 20 is recorded, which realizes a function of determining that the variation is large when the number exceeds a predetermined range.
A function of extracting the maximum value from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts by the computer and determining that excessive tightening is present when the maximum value exceeds a predetermined range. A computer-readable recording medium on which the program according to any one of claims 17 to 21 is recorded.
A function of extracting the minimum value from the values indicating the plurality of tightening strengths corresponding to each of the plurality of bolts by the computer and determining that the tightening force is insufficient when the minimum value is below a predetermined range. A computer-readable recording medium on which the program according to any one of claims 17 to 22 is recorded.
A device having a computer-readable recording medium on which the program according to any one of claims 17 to 23 is recorded.
A plurality of sensors for measuring the strain values of a plurality of bolts capable of fastening a pair of flanges, and a plurality of tightening strengths corresponding to the plurality of bolts obtained from the plurality of strain values obtained by the plurality of sensors. A method of discriminating a bolt being loosened from a plurality of bolts by using a flange bolt fastening system including a computer for acquiring a value indicating a value indicating There,
Among the values indicating the plurality of tightening strengths, the computer determines a value indicating a plurality of tightening strengths that fluctuate in a direction of decreasing beyond a predetermined threshold value.
From a plurality of bolts that are determined to be bolts being operated by loosening the bolt corresponding to the value indicating the tightening strength that fluctuates most among the values indicating the tightening strength that fluctuates in the decreasing direction by the computer. How to determine which bolt is being loosened.
The method for determining a bolt being loosened from a plurality of bolts according to claim 25, wherein the computer acquires a value indicating the plurality of tightening strengths from the plurality of strain values at predetermined time intervals.
A plurality of sensors for measuring the strain values of a plurality of bolts capable of fastening a pair of flanges, and a plurality of tightening strengths corresponding to the plurality of bolts obtained from the plurality of strain values obtained by the plurality of sensors. A computer-readable recording medium in which a program for realizing the following functions is recorded in a flange bolt fastening system including a computer for acquiring a value indicating a value indicating the above and a display device for displaying a plurality of values indicating a tightening strength. And,
Among the values indicating the plurality of tightening strengths by the computer, a function of discriminating a plurality of values indicating a plurality of tightening strengths that fluctuate in a direction of decreasing beyond a predetermined threshold value.
The computer realizes a function of loosening the bolt corresponding to the value indicating the most fluctuating tightening strength among the values indicating the plurality of tightening strengths fluctuating in the decreasing direction and discriminating the bolt as a bolt being operated. A computer-readable recording medium on which the program to be recorded is recorded.
A device having a computer-readable recording medium on which the program according to claim 27 is recorded.