Impact tool, impact tool management system, impact tool management method, and program

Abstract

To provide an impact tool or the like capable of improving determination accuracy on a fastening state of an object part.SOLUTION: The impact tool 3 includes the measurement part 391 configured to measure the hammer advance angle per strike on the target part, the determination part 393 configured to determine whether the hammer advance angle measured by the measurement part 391 is an angle corresponding to normal tightening or an angle corresponding to abnormal tightening from the threshold using the predetermined reference database having the threshold, and the presentation part 37 configured to present information indicating abnormal tightening when the determination part 393 determines that the tightening is abnormal tightening.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to impact tools and the like. [Background technology]

[0002] Patent Document 1 discloses a tool system that can improve the accuracy of determining the fastening state of a fastening part based on reference information that serves as the basis for determining the fastening state of the fastening part and actual measured feature quantities obtained when the tool actually tightens the fastening part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-187923 Summary of the Invention [Problem to be solved by the invention]

[0004] The tool system described in Patent Document 1 determines whether a predetermined torque amount has been applied to a fastening part (target part), but this determination may not be able to determine whether the target part is tightened in the correct direction. In other words, the tool system may erroneously determine that the target part is tightened correctly even when it is not tightened correctly.

[0005] The present invention provides an impact tool and the like that can improve the accuracy of determining the tightening state of a target portion. [Means for solving the problem]

[0006] An impact tool according to one embodiment of the present invention comprises a measurement unit that measures the hammer advance angle per impact on a target part, a determination unit that uses a predetermined reference database having a threshold value to determine from the threshold value whether the hammer advance angle measured by the measurement unit is an angle corresponding to normal tightening or an angle corresponding to abnormal tightening, and a presentation unit that presents information indicating abnormal tightening when the determination unit determines that the tightening is abnormal.

[0007] An impact tool management system according to one aspect of the present invention includes the impact tool described above and a management device that manages information on the determination made by the determination unit provided in the impact tool.

[0008] A method for managing impact tools according to one embodiment of the present invention includes a measurement step of measuring the hammer advance angle per impact on a target part, a determination step of using a predetermined reference database having a threshold value to determine whether the hammer advance angle measured in the measurement step is an angle corresponding to normal tightening or an angle corresponding to abnormal tightening from the threshold value, and a presentation step of presenting information indicating abnormal tightening if the determination step determines that the tightening is abnormal.

[0009] A program according to one aspect of the present invention causes a computer to execute the impact tool management method described above. [Effects of the Invention]

[0010] The impact tool and the like of the present invention can improve the accuracy of determining the tightening state of a target portion. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram of a management system for an impact tool according to the present embodiment. [Figure 2] FIG. 2 is a schematic diagram showing the tightening state of the target area. [Figure 3] FIG. 3 is a block diagram showing the functional configuration of the impact tool management system according to the embodiment. [Figure 4] FIG. 4 is an external view of the impact tool. [Figure 5] FIG. 5 is a diagram showing the change in the cumulative anvil angle with respect to the number of impact blows. [Figure 6] FIG. 6 is a sequence diagram showing the operation of the impact tool management system according to the embodiment. [Figure 7] FIG. 7 is a flowchart showing the detailed steps of step S102 shown in FIG. [Figure 8A] FIG. 8A is a graph showing data on the impact interval and hammer advance angle measured by the measurement unit in step S201 of FIG. [Figure 8B] FIG. 8B is a graph showing the data of the striking intervals that were not excluded in step S202 of FIG. [Figure 8C] FIG. 8C is a graph showing data of the moving average of the hammer advance angle calculated by the estimation unit in step S203 of FIG. [Figure 8D] FIG. 8D is a graph showing the moving average data of the hammer advance angle that was not excluded in step S204 of FIG. [Figure 9] FIG. 9 is a graph showing a feature amount calculated by the estimation unit using the anvil angle estimated from the moving average data of the hammer advance angle shown in FIG. 8D. [Figure 10] FIG. 10 is a flowchart showing the detailed steps of step S109 shown in FIG. [Figure 11] FIG. 11 is a diagram showing an example of the determination result displayed in step S112 shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, the embodiments will be described in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection forms, steps, and step order shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components not recited in independent claims will be described as optional components.

[0013] It should be noted that the drawings are schematic diagrams and are not necessarily strict illustrations. In addition, in the drawings, substantially the same components are denoted by the same reference numerals, and overlapping descriptions may be omitted or simplified.

[0014] (Embodiment) First, the impact tool management system of the present disclosure will be described with reference to FIG. 1. FIG. 1 is a schematic diagram of a management system for an impact tool 3 according to the present embodiment. The management system shown in FIG. 1 targets an object requiring a predetermined tightening by a target portion (e.g., a fastening component), and is a system comprising the impact tool 3, a management device 4, a terminal device 5, and a remote control 6. (a) of FIG. 1 is a schematic diagram showing a situation in which the impact tool 3 transmits actual measurement data regarding the tightening of the target portion to the terminal device 5 (i.e., a learning situation). (b) of FIG. 1 is a schematic diagram showing a situation in which the remote control 6 transmits a reference database having threshold values ​​to the impact tool 3 and sets the threshold values ​​in the impact tool 3 (i.e., a setting situation). The reference database having threshold values ​​transmitted by the remote control 6 in (b) of FIG. 1 includes the threshold values ​​calculated by the terminal device 5 shown in (a) of FIG. 1. (c) of FIG. 1 is a schematic diagram showing a situation in which the impact tool 3 transmits a determination result to the management device 4 (i.e., an operating situation). The determination result transmitted by the impact tool 3 in FIG. 1(c) is the result of the determination made by the impact tool 3 using the threshold value set in FIG. 1(b).

[0015] As shown in FIG. 1(a), the impact tool 3 transmits the acquired measurement data to the terminal device 5. Based on the received measurement data, the terminal device 5 visualizes a threshold value used to determine whether the impact tool 3 has properly tightened the target portion (whether a predetermined amount of torque has been applied to the target portion and whether the target portion has been tightened in the correct direction). The measurement data is data related to the tightening of the target portion. Communication between the impact tool 3 and the terminal device 5 is realized by wireless communication such as Bluetooth (registered trademark), but is not limited to this.

[0016] As shown in (b) of Fig. 1, the remote controller 6 transmits a reference database having threshold values ​​to the impact tool 3, thereby setting the threshold values ​​in the impact tool 3. As a result, when performing a tightening operation, the impact tool 3 uses the threshold values ​​to determine whether or not the tightening of the target part is normal. Note that communication between the impact tool 3 and the terminal device 5 is realized by wireless communication such as infrared communication, for example, but is not limited to this.

[0017] As shown in (c) of Fig. 1, the impact tool 3 transmits the determination result to the management device 4. The management device 4 manages the received determination result. Note that communication between the impact tool 3 and the management device 4 is realized by wireless communication such as Zigbee (registered trademark), but is not limited to this.

[0018] Next, in this specification, specific examples of when the tightening of the target part is normal and when the tightening of the target part is abnormal will be described. FIG. 2 is a schematic diagram showing the tightening state of the target part. Note that FIG. 2 is a schematic diagram showing the tightening state of the target part when the target part is tightened using a bolt 100 and a washer 101. Also, in FIG. 2, the target part inserted into the target part 1 is illustrated so that the tightening state by the target part can be easily understood. Also, in FIG. 2, the screw hole of the target part 1 is provided perpendicular to the plane. FIG. 2(a) is a schematic diagram when the tightening of the target part is normal. FIG. 2(b) and FIG. 2(c) are schematic diagrams when the tightening of the tightening part is abnormal.

[0019] 2(a), the bolt 100 is tightened along the direction of the screw hole, and the entire bearing surface of the bolt 100 is in contact with the washer 101. In this specification, a tightening state that satisfies the above two conditions is defined as normal tightening.

[0020] As shown in Fig. 2(b), the bolt 100 is tightened in the direction of the screw hole, but the bearing surface of the bolt 100 is not in contact with the washer 101. In this specification, the tightening state shown in Fig. 2(b) is referred to as abnormal tightening.

[0021] As shown in Figure 2(c), the bolt 100 is tightened at an angle to the direction of the screw hole, and part of the bearing surface of the bolt 100 is in contact with the washer 101. In this specification, the tightening state shown in Figure 2(c) is referred to as abnormal tightening, similar to the tightening state shown in Figure 2(b). The tightening state shown in Figure 2(c) is also sometimes referred to as galling.

[0022] [composition] The following describes the configuration of the management system 2 for the impact tool 3 according to the embodiment. Fig. 3 is a block diagram showing the functional configuration of the management system 2 for the impact tool 3 according to the embodiment. The present disclosure is composed of an object 1 and the management system 2.

[0023] The object 1 is something that requires predetermined fastening by a target part, such as a vehicle or an aircraft, etc. The target part is, for example, a fastening part such as a screw, a bolt, or a nut.

[0024] The management system 2 is a system for an object 1 that requires a predetermined tightening by a target portion.

[0025] The management system 2 includes an impact tool 3, a management device 4, a terminal device 5, and a remote control 6.

[0026] The impact tool 3 is a tool for tightening a target portion of the target object 1, and is, for example, an impact driver. The impact tool 3 will be described with reference to FIG. 4. FIG. 4 is an external view of the impact tool 3.

[0027] 4, the impact tool 3 includes a body 30. The body 30 includes a trunk portion 31, a grip portion 32, and an attachment portion 33.

[0028] The body 31 is formed in a cylindrical shape. The grip 32 protrudes in one direction from a part of the circumferential surface of the body 31. The attachment part 33 is formed in a flat rectangular parallelepiped shape. The body 31 and the attachment part 33 are connected by the grip 32.

[0029] The body portion 31 accommodates at least some of the components of the fastening portion 36 shown in Fig. 3. An output shaft 361, which is a component of the fastening portion 36, protrudes from one axial end face of the body portion 31.

[0030] The grip portion 32 is a portion that an operator grips when using the impact tool 3 to tighten a fastening part. The grip portion 32 is also provided with a trigger switch 321 that allows the operator to operate the impact tool 3. The trigger switch 321 is a switch that controls the on / off operation of the tightening portion 36. The trigger switch 321 has an initial position and an on position, and the tightening portion 36 operates when the operator pushes or pulls the trigger switch 321 to the on position. The trigger switch 321 can also adjust the rotation speed of the tightening portion 36 depending on the amount of retraction (amount of operation).

[0031] A removable battery 331 is attached to the mounting portion 33 on one side opposite to the side connected to the grip portion 32. The battery 331 is realized by, for example, a lithium ion battery, and supplies power to each component of the impact tool 3 shown in FIG.

[0032] Returning to the explanation of FIG. 3, the impact tool 3 includes a receiving unit 34, a transmitting unit 35, a tightening unit 36, a presenting unit 37, a storage unit 38, and a control unit 39.

[0033] The receiving unit 34 is a communication circuit that enables the impact tool 3 to communicate with the outside (the remote control 6 in FIG. 3). The receiving unit 34 receives a reference database having threshold values ​​transmitted by the transmitting unit 64 of the remote control 6.

[0034] The transmitting unit 35 is a communication circuit for the impact tool 3 to communicate with the management device 4. The transmitting unit 35 transmits a determination result generated by a determination unit 393 of the control unit 39 (described later) to the management device 4. The transmitting unit 35 is also a communication circuit for the impact tool 3 to communicate with the terminal device 5. The transmitting unit 35 transmits actual measurement data generated by the control unit 39 to the terminal device 5.

[0035] The tightening unit 36 ​​has an output shaft 361, a motor 362, an impact mechanism 363, a reduction mechanism (not shown), a drive shaft (not shown), a socket (not shown), an encoder (not shown), etc. The tightening unit 36 ​​rotates the socket (i.e., the tool tip) using power from the motor 362 to tighten the target part.

[0036] The speed reduction mechanism of the fastening unit 36 ​​transmits the rotational force of the rotary shaft of the motor 362 to the drive shaft. The speed reduction mechanism is, for example, a planetary gear mechanism, and converts the rotational speed and torque of the rotary shaft of the motor 362 into the rotational speed and torque required for the fastening operation. The output shaft 361 receives the rotation of the drive shaft and transmits it to the socket. The output shaft 361 rotates around a rotation axis along its protruding direction. In other words, the fastening unit 36 ​​drives the output shaft 361 to rotate the output shaft 361 around the rotation axis.

[0037] A cylindrical socket for rotating a target part (for example, a bolt or a nut) is removably attached to the output shaft 361. The socket rotates together with the output shaft 361 about the rotation axis. The size of the socket attached to the output shaft 361 is selected appropriately by the operator according to the size of the target part. With this configuration, when the tightening unit 36 ​​operates, the output shaft 361 rotates, and the socket rotates together with the output shaft 361. At this time, if the socket is fitted into the target part, the target part rotates together with the socket, and the impact tool 3 tightens the target part.

[0038] Also, a socket anvil can be attached to the output shaft 361 instead of the socket. In this case, a bit (for example, a driver bit or a drill bit) can be attached to the impact tool 3 via the socket anvil.

[0039] The impact mechanism 363 is driven by the power of the motor 362. The impact mechanism 363 includes, for example, a hammer rotatably supported by a drive shaft, and an anvil (striking unit) provided at the rear end of the output shaft 361. The hammer strikes the anvil in response to the rotation of the drive shaft. The hammer has two claws on the surface that contacts the anvil, and the anvil has two claws on the surface that contacts the hammer. When the hammer strikes the anvil, the claws of the hammer and the anvil come into contact so as to catch on each other, thereby applying an impact in the rotational direction. The two claws of the hammer and the anvil are spaced 180° apart, and the hammer strikes the anvil every half rotation.

[0040] When the amount of torque applied to the target portion exceeds a predetermined level (for example, when the amount of torque reaches 80% of the amount of torque required for predetermined fastening), the impact mechanism 363 applies an impact in the rotational direction to the output shaft 361. This enables the impact tool 3 to apply a larger amount of torque to the target portion.

[0041] In the present embodiment, it is not essential that the impact mechanism 363 and the socket are included in the components of the fastening portion 36. The impact mechanism 363 and the socket do not necessarily have to be included in the components of the fastening portion 36.

[0042] The indicator 37 indicates to the operator the determination result generated by the determining unit 393 of the control unit 39, and is realized by, for example, an LED (Light Emitting Diode) or the like. The indicator 37 is provided, for example, on the end surface of the trunk portion 31 of the body 30 opposite to the end surface on which the output shaft 361 is provided, so that the operator can easily visually check the indicator 37 while using the impact tool 3.

[0043] The storage unit 38 is a storage device that stores a reference database having thresholds, a computer program executed by the control unit 39, and the like. The storage unit 38 is realized by, for example, a memory.

[0044] The control unit 39 controls the operation (i.e., the tightening operation) of the tightening unit 36. Specifically, the control unit 39 controls the operation of the motor 362, the impact mechanism 363, and other components of the tightening unit 36 ​​so that a predetermined torque amount set in advance is applied to the target area. When the torque amount estimated by the estimation unit 392, which will be described later, reaches the predetermined torque amount, the control unit 39 stops the operation of the motor 362, the impact mechanism 363, and other components.

[0045] The control unit 39 controls the display by the presentation unit 37 according to the determination result generated by the determination unit 393. For example, the control unit 39 lights up the presentation unit 37 in green when the determination result is normal tightening, and lights up the presentation unit 37 in orange or red when the determination result is abnormal tightening. The control of the presentation unit 37 performed by the control unit 39 will be described in detail later.

[0046] The control unit 39 is realized by, for example, a microcomputer or a processor, etc. The functions of the control unit 39 are realized, for example, by the microcomputer or processor constituting the control unit 39 executing a computer program stored in the storage unit 38.

[0047] The control unit 39 includes a measurement unit 391 , an estimation unit 392 , and a determination unit 393 .

[0048] The measuring unit 391 measures the hammer advance angle per impact on the target part. The hammer advance angle per impact is the angle the hammer rotates from the first impact on the anvil to the next impact. The hammer advance angle is obtained by the following equation (1). The number of detections of light pulses or the like, which corresponds to the hammer advance angle by the encoder per impact, is obtained from the encoder, which is a component of the impact tool 3. The values ​​360 and 100 on the right-hand side are values ​​indicating a setting in which the motor 362 rotates 360° when the encoder detects 100 times, and are values ​​that vary depending on the configuration of the impact tool 3. The value 8.29 on the right-hand side is a value indicating the gear ratio between the motor 362 and the hammer, and is a value that varies depending on the configuration of the impact tool 3.

[0049]

number

[0050] Furthermore, the measuring unit 391 measures the striking interval, which is the time interval at which the hammer of the impact mechanism 363 strikes the anvil.

[0051] The estimation unit 392 estimates the anvil angle using the hammer advance angle per strike obtained from the strike interval and hammer advance angle measured by the measurement unit 391. The anvil angle is the angle by which the anvil rotates with each impact of the hammer. The anvil angle is obtained by the following equation (2). Note that in equation (2), the hammer rotates 180° more than the anvil before striking the anvil, so 180° is subtracted per strike. The number of strikes on the right side is the total number of times the hammer strikes the anvil.

[0052]

number

[0053] Furthermore, the estimation unit 392 generates at least one of data relating to the hammer advance angle per impact and the estimated anvil angle as actual measurement data. Furthermore, the actual measurement data may include data including the hammer advance angle per impact of the impact tool 3 during normal tightening of the target portion or a portion equivalent to the target portion, and the hammer advance angle per impact of the impact tool 3 during abnormal tightening. Note that a portion equivalent to the target portion means, for example, a portion that is symmetrical to the target portion and has substantially the same relationship as the target portion, such as a portion that is tightened using the same target portion.

[0054] The estimation unit 392 estimates the amount of torque applied to the target part based on the strike interval and hammer advance angle measured by the measurement unit 391. For example, the estimation unit 392 estimates the amount of torque applied to the target part based on the number of strikes of the hammer, the strike interval, etc.

[0055] The determination unit 393 uses a reference database stored in the storage unit 38 to determine whether the hammer advance angle measured by the measurement unit 391 is an angle corresponding to normal tightening or an angle corresponding to abnormal tightening, based on a threshold value stored in the reference database. Specifically, the determination unit 393 determines whether the anvil angle estimated by the estimation unit 392 is an angle corresponding to normal tightening or an angle corresponding to abnormal tightening, based on the threshold value. Furthermore, the determination unit 393 determines whether the torque amount estimated by the estimation unit 392 is an amount corresponding to normal tightening or an amount corresponding to abnormal tightening. Furthermore, the determination unit 393 generates a determination result based on the above-mentioned determination.

[0056] The management device 4 is a server device that manages information on the determination (i.e., the determination result) by the determination unit 393 included in the impact tool 3. The management device 4 includes a receiving unit 41, a display unit 42, a storage unit 43, and a control unit 44.

[0057] The receiving unit 41 is a communication circuit for the management device 4 to communicate with the impact tool 3. The receiving unit 41 receives the determination result transmitted by the transmitting unit 35 of the impact tool 3.

[0058] The display unit 42 displays the determination results and the like, and is realized by, for example, a liquid crystal display.

[0059] The storage unit 43 is a storage device that stores the determination results and the computer programs executed by the control unit 44. The storage unit 43 is realized by, for example, a memory.

[0060] The control unit 44 controls the entire management device 4. For example, the control unit 44 is realized by a microcomputer or a processor. The functions of the control unit 44 are realized, for example, by the microcomputer or processor constituting the control unit 44 executing a computer program stored in the storage unit 43.

[0061] The terminal device 5 is a device that generates a reference database having threshold values ​​using the actual measurement data transmitted from the impact tool 3, and is, for example, an information terminal such as a smartphone, a tablet, or a computer.

[0062] The terminal device 5 includes a receiving unit 51, a display unit 52, a storage unit 53, a transmitting unit 54, and a control unit 55.

[0063] The receiving unit 51 is a communication circuit for the terminal device 5 to communicate with the impact tool 3. The receiving unit 51 receives the measurement data transmitted by the transmitting unit 35 of the impact tool 3.

[0064] The display unit 52 displays the actual measurement data and the like, and is realized by, for example, a liquid crystal display.

[0065] The storage unit 53 is a storage device that stores the actual measurement data, the computer program executed by the control unit 55, etc. The storage unit 53 is realized by, for example, a memory.

[0066] The transmission unit 54 is a communication circuit for the terminal device 5 to communicate with the remote control 6. The transmission unit 54 transmits to the remote control 6 a reference database generated by a generation unit 551 of the control unit 55, which will be described later.

[0067] The control unit 55 controls the entire terminal device 5. For example, the control unit 55 is realized by a microcomputer or a processor. The functions of the control unit 55 are realized, for example, by the microcomputer or processor constituting the control unit 55 executing a computer program stored in the storage unit 53. The control unit 55 also includes a generation unit 551.

[0068] The generating unit 551 generates a reference database based on the actual measurement data. Specifically, the generating unit 551 generates a threshold based on a feature amount calculated from the actual measurement data, and generates a reference database having the threshold amount. Alternatively, an operator or the like may determine a threshold amount from the feature amount calculated from the actual measurement data, and the generating unit 551 may generate a reference database having the threshold amount. A detailed description of the feature amount will be given later.

[0069] The remote controller 6 is a device for setting a reference database in the impact tool 3, and is, for example, a remote controller used by an operator to set a reference database in the impact tool 3.

[0070] The remote controller 6 includes a receiving unit 61 , an input unit 62 , a storage unit 63 , a transmitting unit 64 , and a control unit 65 .

[0071] The receiving unit 61 is a communication circuit for the remote control 6 to communicate with the terminal device 5. The receiving unit 61 receives the reference database transmitted by the transmitting unit 54 of the terminal device 5.

[0072] The input unit 62 receives input from an operator or the like, and is realized by, for example, buttons or a touch panel.

[0073] The storage unit 63 is a storage device that stores a reference database and a computer program executed by the control unit 65. The storage unit 63 is realized by, for example, a memory.

[0074] The transmitting unit 64 is a communication circuit that enables the remote control 6 to communicate with the impact tool 3. The transmitting unit 64 transmits the reference database to the impact tool 3. Note that the act of the transmitting unit 64 transmitting the reference database to the impact tool 3 may be referred to as setting a threshold value.

[0075] The control unit 65 controls the entire remote control 6. For example, the control unit 65 is realized by a microcomputer or a processor, etc. The functions of the control unit 65 are realized, for example, by the microcomputer or processor constituting the control unit 65 executing a computer program stored in the storage unit 63.

[0076] Instead of transmitting the reference database generated by the terminal device 5 to the remote control 6, the reference database displayed on the terminal device 5 may be manually input by an operator or the like into the remote control 6.

[0077] [Difference in anvil angle between normal and abnormal tightening] The difference in the anvil angle estimated by the estimation unit 392 during normal tightening and abnormal tightening of the target portion will be explained using Figure 5. Figure 5 is a diagram showing the transition of the cumulative anvil angle relative to the number of impact blows. In the graph shown in Figure 5, the horizontal axis represents the number of impact blows and the vertical axis represents the cumulative anvil angle. The solid line represents the transition of the cumulative anvil angle during normal tightening, and the dashed line represents the transition of the cumulative anvil angle during abnormal tightening. The number of impact blows is the total number of times the hammer of the impact mechanism 363 strikes the anvil, and the cumulative anvil angle is the cumulative value of the anvil angle estimated by the estimation unit 392.

[0078] As shown in Figure 5, during normal tightening, the cumulative anvil angle changes very little once the number of impact blows exceeds a certain number. On the other hand, during abnormal tightening, the rate of increase in the cumulative anvil angle does not vary much with the number of impact blows. In other words, the cumulative anvil angle during abnormal tightening is larger than the cumulative anvil angle during normal tightening.

[0079] Furthermore, the feature amount used by the generation unit 551 is a value calculated by multiplying the cumulative anvil angle (i.e., the cumulative anvil angle indicated by the double-headed arrow in (1) in Figure 5) by the average value of the anvil angle per impact (i.e., the slope of the arrow in (2) in Figure 5). In other words, the feature amount during abnormal tightening is a larger value than the feature amount during normal tightening. Note that the estimation unit 392 may calculate the feature amount, or the generation unit 551 may calculate the feature amount. When the estimation unit 392 calculates the feature amount, data including the feature amount is generated as actual measurement data.

[0080] [Management system operation] Fig. 6 is a sequence diagram showing the operation of the management system 2 for the impact tool 3 according to the embodiment. Steps S101 to S104 in Fig. 6 correspond to the learning period shown in Fig. 1(a), steps S105 to S107 correspond to the setting period shown in Fig. 1(b), and steps S108 to S112 correspond to the operation period shown in Fig. 1(c).

[0081] First, the worker uses the impact tool 3 to tighten the target portion of the target object 1 (that is, to perform the tightening operation) (step S101).

[0082] The estimation unit 392 of the impact tool 3 generates actual measurement data from the results of the measurement by the measurement unit 391 (step S102).

[0083] The transmitting unit 35 of the impact tool 3 transmits the actual measurement data generated by the estimating unit 392 in step S102 to the terminal device 5 (step S103). Note that if step S101 is executed again after step S103, the impact tool 3 executes steps S102 to S103.

[0084] The generation unit 551 of the terminal device 5 generates a reference database based on the actual measurement data transmitted in step S103 (step S104).

[0085] The transmitting unit 54 of the terminal device 5 transmits the reference database generated by the generating unit 551 in step S104 to the remote control 6 (step S105).

[0086] The input unit 62 of the remote controller 6 receives an input from the operator (step S106).

[0087] The transmitting unit 64 of the remote controller 6 transmits the reference database (that is, the setting of the threshold value) to the impact tool 3 (step S107).

[0088] After step S107, the worker uses the impact tool 3 to tighten the target portion of the target object 1 (that is, to perform the tightening operation) (step S108).

[0089] The determination unit 393 of the impact tool 3 determines whether the tightening operation performed in step S108 is normal tightening or abnormal tightening based on a threshold value (step S109).

[0090] The presenting unit 37 of the impact tool 3 presents to the worker information corresponding to the determination result generated by the determining unit 393 based on the determination in step S109 (step S110). For example, the presenting unit 37 presents to the worker light corresponding to the determination result.

[0091] The transmitting unit 35 of the impact tool 3 transmits the determination result generated by the determining unit 393 based on the determination made in step S109 to the management device 4 (step S111). Note that if step S108 is executed again after step S111, the impact tool 3 executes steps S109 to S111.

[0092] The control unit 44 of the management device 4 displays the determination result transmitted in step S111 on the display unit 42 (step S112).

[0093] In step S103, the transmitting unit 35 may transmit each time actual measurement data is generated in step S102, or may transmit multiple sets of actual measurement data together. Similarly, in step S111, the transmitting unit 35 may transmit each time a determination result based on the determination in step S109 is generated, or may transmit multiple sets of determination results together.

[0094] Furthermore, when updating to the latest reference database or when the target portion on which the impact tool 3 performs the tightening operation is changed, the reference database set in the impact tool 3 may be updated. For example, to update the reference database, the process may be executed again from step S101, or when the latest reference database or the reference database for the changed target portion has already been generated, the process may be executed from step S105.

[0095] Also, step S105 may be omitted. For example, in step S106, the operator may manually input the reference database into the remote control 6.

[0096] Next, details of step S102 in Fig. 6 will be described with reference to Fig. 7. Fig. 7 is a flowchart showing detailed steps of step S102 shown in Fig. 6.

[0097] First, when the impact tool 3 performs a tightening operation, the measuring unit 391 measures the impact interval and the hammer advance angle per impact (step S201).

[0098] The estimation unit 392 excludes data with a striking interval of one cycle or more and data before the data from the data used to estimate the anvil angle (step S202). Note that one cycle means the period in which the hammer makes a half rotation and strikes the anvil.

[0099] The estimation unit 392 calculates a moving average of the hammer advance angle using the data remaining in step S202 (step S203).

[0100] The estimation unit 392 excludes data indicating a value outside the set range from the data of the moving average of the hammer advance angle calculated in step S203, from the data used to estimate the anvil angle (step S204).

[0101] The estimation unit 392 estimates the anvil angle using the data remaining in step S204 (step S205).

[0102] The estimation unit 392 uses the anvil angle estimated in step S205 to calculate the cumulative anvil angle and the average value of the anvil angle per hit described with reference to FIG. 5, and calculates the feature amount (step S206).

[0103] Specific examples of each step in FIG. 7 will be described with reference to FIGS. 8A to 8D.

[0104] Fig. 8A is a graph showing data on the impact interval and hammer advance angle measured by measurement unit 391 in step S201 of Fig. 7. In the graph shown in Fig. 8A, the horizontal axis represents the number of impact blows, the first vertical axis on the left represents the hammer advance angle, and the second vertical axis on the right represents the impact interval. In Fig. 8A, the solid line represents the impact interval, and the dashed line represents the hammer advance angle, and this is also true for Fig. 8A and subsequent figures.

[0105] As shown in FIG. 8A, the measuring unit 391 measures the strike interval and hammer advance angle for each impact. The hammer advance angle shown in FIG. 8A is the hammer advance angle per strike. Focusing on the strike interval, the strike interval is approximately 18 msec except for the fourth impact strike, and is 40 msec or longer for the fourth impact strike. In FIG. 8A, the strike interval for one cycle is approximately 18 msec, and the strike interval for the fourth impact strike is approximately two cycles. This means that, between the third and fourth strikes of the hammer on the anvil, the hammer claw missed the anvil claw in the first cycle, resulting in a miss, and then the hammer claw caught the anvil claw and struck the strike in the second cycle.

[0106] Fig. 8B is a graph showing data of impact intervals that were not excluded in step S202 of Fig. 7. In Fig. 8B, the estimation unit 392 executes step S202 of Fig. 7 using the data of impact intervals shown in Fig. 8A.

[0107] As shown in Figure 8B, the estimation unit 392 excludes data with an impact interval of one cycle or more from the impact interval data shown in Figure 8A and data prior to that data (in Figure 8B, data with impact strikes up to the fourth time) from the data used to estimate the anvil angle.

[0108] Fig. 8C is a graph showing data on the moving average of the hammer advance angle calculated by estimation unit 392 in step S203 of Fig. 7. Note that in Fig. 8C, estimation unit 392 executes step S203 of Fig. 7 using hammer advance angle data corresponding to the strike interval data shown in Fig. 8B. The dashed dotted line shown in Fig. 8C is a line indicating the moving average of the hammer advance angle, and this is also true in Fig. 8C and subsequent figures.

[0109] As shown in FIG. 8C, the estimation unit 392 calculates a moving average of the hammer advance angle using the hammer advance angle data (in FIG. 8C, data from the fifth impact strike onwards) corresponding to the impact interval data shown in FIG. 8B (i.e., data of the impact interval that was not excluded in the explanation of FIG. 8B).

[0110] Fig. 8D is a graph showing data of the moving average of the hammer advance angle that was not excluded in step S204 of Fig. 7. In Fig. 8D, estimation unit 392 executes step S204 of Fig. 7 using the data of the moving average of the hammer advance angle shown in Fig. 8C. In Fig. 8D, the setting range will be described as 170° to 190°.

[0111] As shown in Fig. 8D, the estimation unit 392 excludes data showing values ​​outside the set range among the moving average data of the hammer advance angle shown in Fig. 8C (data for the fifth and seventh impact blows in Fig. 8D) from the data used to estimate the anvil angle. Note that the estimation unit 392 estimates the anvil angle using the moving average data of the hammer advance angle remaining in Fig. 8D (step S205 in Fig. 7) and calculates the feature amount (step S206 in Fig. 7).

[0112] A specific example of step S104 in FIG. 6 will be described with reference to FIG.

[0113] Fig. 9 is a graph showing feature amounts calculated by the estimation unit 392 using the anvil angle estimated from the moving average data of the hammer advance angle shown in Fig. 8D (i.e., the data of the strike intervals that were not excluded in the explanation of Fig. 8D). Note that the graph shown in Fig. 9 is an example of an image displayed on the display unit 52 of the terminal device 5.

[0114] 9, the horizontal axis represents the number of tightening operations, and the vertical axis represents the feature amount calculated by the estimation unit 392. The number of tightening operations means the number of times that the impact tool 3 tightens one target part.

[0115] Furthermore, the normality indicated by a circle and the abnormality indicated by a triangle are results determined by a threshold value generated by the generation unit 551 of the terminal device 5. In Fig. 9, the generation unit 551 generates a feature amount using a threshold value of approximately 75. The generation unit 551 generates the graph shown in Fig. 9 by regarding feature amounts below the threshold value as normal and feature amounts above the threshold value as abnormal. Furthermore, the generation unit 551 generates a reference database having the generated threshold value.

[0116] The threshold values ​​shown in FIG. 9 may be changed to any values ​​by, for example, an operator.

[0117] In addition, the terminal device 5 stores and manages the generated reference database, so that, for example, when replacing an impact tool 3 due to a malfunction, the worker can set the reference database stored by the terminal device 5 to the new impact tool 3.

[0118] Details of step S109 in Fig. 6 will be described with reference to Fig. 10. Fig. 10 is a flowchart showing detailed steps of step S109 shown in Fig. 6. Note that steps S301 to S306 shown in Fig. 10 are the same as steps S201 to S206 shown in Fig. 7, respectively, and therefore description thereof will be omitted.

[0119] The estimation unit 392 estimates the amount of torque applied to the target part based on the strike interval and the hammer advance angle per strike measured in step S301 (step S307).

[0120] The determination unit 393 determines whether the feature amount calculated by the estimation unit 392 in step S306 is equal to or greater than a threshold value (step S308).

[0121] When it is determined that the feature amount is equal to or greater than the threshold value (Yes in step S308), the determining unit 393 determines that the tightening operation is abnormal tightening (step S309).

[0122] The determination unit 393 generates a determination result based on the determination made in step S309 (step S310).

[0123] Based on the determination in step S309, the presenting unit 37 presents information indicating abnormal tightening to the worker (step S311). For example, the presenting unit 37 turns on a red light to present information indicating abnormal tightening to the worker.

[0124] When it is determined that the feature amount is less than the threshold value (No in step S308), the determining unit 393 determines whether the torque amount estimated by the estimating unit 392 in step S307 is within a specified range (step S312).

[0125] When it is determined that the estimated torque amount is not within the specified range (No in step S312), the determining unit 393 determines that the tightening operation is abnormal tightening (step S309).

[0126] When it is determined that the estimated torque amount is within the specified range (Yes in step S312), the determining unit 393 determines that the tightening operation is normal tightening (step S313).

[0127] The determination unit 393 generates a determination result based on the determination made in step S313 (step S314).

[0128] Based on the determination in step S313, the presenting unit 37 presents information indicating that the tightening has been performed normally to the worker (step S315). For example, the presenting unit 37 turns on a green light to present information indicating that the tightening has been performed normally to the worker.

[0129] Note that step S307 may be executed at any time after step S301 and before step S308.

[0130] Furthermore, step S310 may be executed after step S311 or simultaneously with step S311. Furthermore, step S314 may be executed after step S315 or simultaneously with step S315.

[0131] Furthermore, after the determination of Yes in step S308, the determination of step S312 may be additionally performed. In this case, the determination unit 393 determines that the tightening has occurred abnormally regardless of the result of the determination of step S312, but the information presented by the presentation unit 37 in step S311 can be varied. For example, if the determination unit 393 determines that the tightening has occurred abnormally in both determinations (i.e., if the determination unit 393 determines that the tightening has occurred abnormally in both determinations (i.e., if the determination unit 393 determines that the tightening has occurred correctly in one determination and that the tightening has occurred abnormally in the other determination (i.e., if the determination unit 393 determines that the tightening has occurred correctly in the other determination and that the tightening has occurred abnormally in the other determination) (i.e., if the determination unit 393 determines that the tightening has occurred correctly in the other determination and that the tightening has occurred abnormally in the other determination), the presentation unit 37 turns on an orange light. This allows the operator to obtain more detailed information in real time.

[0132] Fig. 11 is a diagram showing an example of the determination result displayed in step S112 shown in Fig. 6. The table shown in Fig. 11 is an example of an image displayed on the display unit 42 of the management device 4.

[0133] As shown in FIG. 11, the construction results include the tools used, the calibration date of the tools used, the name of the worker, the work time, the set torque, the specified torque range, the tightening torque, the feature value, the threshold value, and the tightening state, but may also include other information about the tightening of the target part.

[0134] In the column of the tool used, the identification number of the impact tool 3 is displayed.

[0135] The date on which the impact tool 3 was calibrated is displayed in the column for the calibration date of the tool used.

[0136] The worker name column displays information about the worker who performed the tightening operation. For example, the worker's name may be displayed, or an identification number assigned to each worker may be displayed.

[0137] The work time column displays the time when the tightening operation started.

[0138] The set torque column displays the amount of torque required for a predetermined tightening of the object 1.

[0139] The specified torque range displays the range of torque amount used when determining whether the torque amount is within the specified range by determining unit 393.

[0140] In the tightening torque column, the amount of torque applied to the target part estimated by the estimation unit 392 is displayed.

[0141] In the feature amount column, the feature amount calculated by the estimation unit 392 is displayed.

[0142] The threshold column displays the threshold used by the determining unit 393 to determine the feature amount.

[0143] In the tightening state column, the tightening state determined by the determining unit 393 is displayed.

[0144] For example, looking at the column for the work time of 11:00, the tightening state is normal tightening, so it can be seen that the tightening of the target part was performed accurately. More specifically, the tightening torque was 5.0, which is within the specified torque range (4.8 to 5.2), so it can be seen that the operation of the tightening unit 36 ​​stopped after the tightening torque reached the set torque. Furthermore, the feature amount is 18, which is below the threshold value (75), so it can be seen that the target part was tightened in the correct direction. In other words, it can be seen that the target part is in the tightening state shown in Figure 2(a).

[0145] Furthermore, looking at the column for the work time of 11:05, it can be seen that the tightening state is abnormal, indicating that the tightening of the target part was not performed correctly. More specifically, the tightening torque is 3.5, which is outside the specified torque range (4.8 to 5.2), indicating that the operation of the tightening unit 36 ​​stopped before the tightening torque reached the set torque. Furthermore, the feature value is 20, which is below the threshold value (75), indicating that the target part was tightened in the correct direction. In other words, it can be seen that the target part is in the tightening state shown in Figure 2(b).

[0146] Furthermore, looking at the column for the work time 11:13, the tightening state is abnormal tightening, so it can be seen that the tightening of the target part was performed correctly. More specifically, the tightening torque was 5.0, which is within the specified torque range (4.8 to 5.2), so it can be seen that the operation of the tightening unit 36 ​​stopped after the tightening torque reached the set torque. Furthermore, the feature amount is 85, which is above the threshold value (75), so it can be seen that the target part was tightened in the incorrect direction. In other words, it can be seen that the target part is in a tightening state known as "galling," as shown in Figure 2(c).

[0147] Note that an operator or the like may customize the display so as to display only part of the data of the determination results shown in Fig. 11. For example, the management device 4 may display data excluding the tools used.

[0148] [Effects, etc.] Hereinafter, examples of inventions that can be obtained from the disclosure of this specification will be given, and the effects and the like that can be obtained from these inventions will be explained.

[0149] Invention 1 is an impact tool 3 comprising a measurement unit 391 that measures the hammer advance angle per impact on a target part, a determination unit 393 that uses a predetermined reference database having a threshold value to determine from the threshold value whether the hammer advance angle measured by measurement unit 391 is an angle corresponding to normal tightening or an angle corresponding to abnormal tightening, and a presentation unit 37 that presents information indicating abnormal tightening when determination unit 393 determines that the tightening is abnormal.

[0150] Such an impact tool 3 determines whether the hammer advance angle is normal or abnormal tightening based on a threshold value, and therefore can more accurately determine the tightening state of the target part compared to conventional techniques that determine the tightening state simply based on the measured feature amount at the time of make-up completion. As a result, the impact tool 3 can improve the accuracy of determining the tightening state of the target part.

[0151] Invention 2 is the impact tool 3 of Invention 1, which includes an estimation unit 392 that estimates the anvil angle using the hammer advance angle per impact measured by the measurement unit 391.

[0152] Such an impact tool 3 estimates the anvil angle using the hammer advance angle per impact, and therefore can estimate the rotation angle of the tool tip (for example, a socket), which allows the impact tool 3 to more accurately determine the tightening state of the target part.

[0153] Invention 3 is the impact tool 3 of Invention 1 or 2, in which the reference database is a database generated from actual measurement data obtained in advance using the hammer advance angle per impact of the impact tool 3 during normal tightening of the target part or a part corresponding to the target part, and the hammer advance angle per impact of the impact tool 3 during abnormal tightening.

[0154] Such an impact tool 3 determines whether the tightening is normal or abnormal using a reference database created from actual measurement data obtained in advance, so that the tightening state of the target area can be determined more accurately.

[0155] Invention 4 is the impact tool 3 of any one of Inventions 1 to 3, wherein the reference database is updatable.

[0156] Such an impact tool 3 has an updatable reference database, and therefore can respond to various changes in circumstances, such as updating the reference database to the latest version or updating the reference database due to a change in the target portion.

[0157] Invention 5 is the impact tool 3 of any one of Inventions 1 to 4, wherein the threshold value is variable.

[0158] In such an impact tool 3, the threshold value used by the determination unit 393 is variable, so that, for example, an operator can make adjustments for each impact tool 3 or each process in which a tightening operation is performed. This allows the impact tool 3 to make a determination according to the inclination of the operator, etc.

[0159] A sixth aspect of the present invention is the impact tool 3 according to any one of the first to fifth aspects of the present invention, further comprising a transmitting section 35 that transmits the determination result of the determining section 393 to an external device.

[0160] Such an impact tool 3 transmits the determination result to the outside, so that the worker or the like can check the determination result even after the tightening work is completed.

[0161] A seventh aspect of the present invention is the impact tool 3 according to any one of the first to sixth aspects, further comprising a receiving unit 34 that receives a threshold setting from an external device.

[0162] Such an impact tool 3 uses a threshold value received from the outside to determine whether the tightening is normal or abnormal, and therefore can more accurately determine the tightening state of the target portion.

[0163] Invention 8 is a management system 2 for an impact tool 3, comprising the impact tool 3 according to any one of Inventions 1 to 7, and a management device 4 that manages information on determinations made by a determination unit 393 provided in the impact tool 3.

[0164] Such a management system 2 manages information on the determination made by the determining unit 393 (that is, the determination result), and can therefore store the determination result.

[0165] Invention 9 is a method for managing an impact tool 3, including a measurement step (S301) of measuring the hammer advance angle per impact on a target part, a determination step (S308) of using a predetermined reference database having a threshold value to determine whether the hammer advance angle measured in the measurement step (S301) is an angle corresponding to normal tightening or an angle corresponding to abnormal tightening from the threshold value, and a presentation step (S311) of presenting information indicating abnormal tightening if the determination step (S308) determines that the tightening is abnormal.

[0166] This type of management method determines whether the hammer advance angle is normal tightening or abnormal tightening from the threshold value, and therefore can more accurately determine the tightening state of the target part. As a result, the management method can improve the accuracy of determination regarding the tightening state of the target part.

[0167] Invention 10 is a program for causing a computer to execute the impact tool 3 management method of Invention 9.

[0168] According to such a program, the computer can improve the accuracy of determining the tightening state of the target area.

[0169] (Other embodiments) Although the embodiments have been described above, the present invention is not limited to the above-described embodiments.

[0170] For example, the communication method between the devices in the above-described embodiments is not particularly limited. Furthermore, a relay device (such as a broadband router) (not shown) may be involved in the communication between the devices.

[0171] Furthermore, the presentation unit 37 is not limited to an LED or the like, and may be realized by, for example, a liquid crystal display or organic EL (Electro Luminescence) display. Furthermore, instead of or in addition to presenting the determination result by visual display such as light or an image, the presentation unit 37 may present the determination result by sound. For example, the presentation unit 37 may be realized by an output unit such as a speaker or buzzer that outputs sound. The output sound may be an electronic sound or a synthesized voice. Note that it is preferable that the control unit 39 generates different sounds from the output unit when the determination unit 393 determines that the tightening is normal and when it determines that the tightening is abnormal.

[0172] In addition, an example has been described in which the impact tool 3 determines the tightening state of the target part using a reference database stored in the memory unit 38, but for example, the impact tool 3 may receive the reference database from the terminal device 5 or the remote control 6 and perform the determination each time the tightening operation of step S108 is performed.

[0173] In the above-described embodiment, the processing performed by a specific processing unit may be performed by another processing unit. The order of multiple processing operations may be changed, or multiple processing operations may be performed in parallel.

[0174] In the above-described embodiments, each component may be realized by executing a software program suitable for that component, or by a program execution unit such as a CPU or processor reading and executing a software program recorded on a recording medium such as a hard disk or semiconductor memory.

[0175] Furthermore, each component may be realized by hardware. For example, each component may be a circuit (or integrated circuit). These circuits may form a single circuit as a whole, or each may be a separate circuit. Furthermore, each of these circuits may be a general-purpose circuit or a dedicated circuit.

[0176] Furthermore, the general or specific aspects of the present invention may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a computer-readable recording medium such as a CD-ROM, or as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0177] For example, the present invention may be realized as a method executed by a computer system such as a construction management system, or as a program for causing a computer system to execute the method. Furthermore, the present invention may be realized as a computer-readable non-transitory recording medium on which such a program is recorded.

[0178] In addition, the present invention also includes forms obtained by applying various modifications to each embodiment that a person skilled in the art would think of, or forms realized by arbitrarily combining the components and functions of each embodiment within the scope of the present invention. [Explanation of symbols]

[0179] 2 Management System 3 Impact tools 34 Receiving unit 35 Transmitter 37 Presentation part 391 Measurement Department 392 Estimation Department 393 Judgment section 4 Management device

Claims

1. a measuring unit that measures the hammer advance angle per strike on the target part; a determination unit that uses a predetermined reference database having threshold values ​​and determines, from the threshold values, whether the hammer advance angle measured by the measurement unit is an angle corresponding to normal tightening or an angle corresponding to abnormal tightening; a presentation unit that presents information indicating abnormal tightening when the determination unit determines that abnormal tightening has occurred, Impact tool.

2. an estimation unit that estimates an anvil angle using the hammer advance angle per blow measured by the measurement unit; The impact tool according to claim 1 .

3. The reference database is a database generated from actual measurement data obtained in advance using a hammer advance angle per impact of an impact tool during normal tightening and a hammer advance angle per impact of an impact tool during abnormal tightening on the target portion or a portion corresponding to the target portion. The impact tool according to claim 1 .

4. The reference database is updatable. The impact tool according to claim 1 .

5. The threshold is variable. The impact tool according to claim 1 .

6. a transmitting unit that transmits the determination result by the determining unit to an external device; The impact tool according to claim 1 .

7. a receiving unit that receives the setting of the threshold value from an external device; The impact tool according to claim 1 .

8. An impact tool according to any one of claims 1 to 7; a management device that manages information on the determination made by the determination unit included in the impact tool, Impact tool management system.

9. a measuring step of measuring a hammer advance angle per strike on a target portion; a determination step of using a predetermined reference database having a threshold value to determine whether the hammer advance angle measured in the measurement step is an angle corresponding to normal fastening or an angle corresponding to abnormal fastening, based on the threshold value; a presentation step of presenting information indicating abnormal tightening when the determination step determines abnormal tightening, How to manage impact tools.

10. A program for causing a computer to execute the impact tool management method according to claim 9.

Images