Power tool systems, diagnostic methods, and programs

Abstract

To enable a user, etc. to easily determine deterioration of efficiency of an operation using an electric tool section.SOLUTION: An electric tool system 100 includes an electric tool section 1, a measurement section 4, a storage section 62 and a determination section 63. The measurement section 4 measures physical quantity related to the electric tool section 1. The storage section 62 stores the physical quantity measured by the measurement section 4. The determination section 63 determines replacement information on whether or not replacement of a tip tool is necessary on the basis of the physical quantity stored in the storage section 62.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure generally relates to a power tool system, a diagnostic method, and a program, and more particularly to a power tool system, a diagnostic method, and a program for obtaining information on a tip tool attached to a power tool unit.

Background Art

[0002] The power tool described in Patent Document 1 includes a motor, an acquisition unit, a storage unit, and a transmission unit. The acquisition unit acquires physical quantity data detected during rotation of the motor. The storage unit stores the physical quantity data in association with time information regarding the time when the physical quantity data was acquired. The transmission unit transmits the physical quantity data and the time information to a server system. The server system evaluates the degree of the state of the power tool using the physical quantity data and the time information.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present disclosure is to provide a power tool system, a diagnostic method, and a program that make it easy for a user or the like to determine a deterioration in the efficiency of work using a power tool unit.

Means for Solving the Problems

[0005] An electric tool system according to one aspect of the present disclosure comprises an electric tool unit, a measuring unit, a storage unit, and a determination unit. The electric tool unit is portable. The electric tool unit has a drive unit, a mounting unit, and a transmission unit. The drive unit receives power from a power source and generates torque. The mounting unit can be fitted with a tool tip. The transmission unit transmits the torque from the drive unit to the mounting unit and drives the mounting unit. The measuring unit measures physical quantities related to the electric tool unit. The storage unit stores the physical quantities measured by the measuring unit. The determination unit obtains replacement information regarding whether the tool tip needs to be replaced based on the physical quantities stored in the storage unit. The measurement unit includes a thrust load measurement unit that measures the thrust load applied to the tip tool as the physical quantity. The determination unit determines the exchange information based on the thrust load stored in the storage unit.

[0006] A diagnostic method according to one aspect of the present disclosure is a diagnostic method for diagnosing a portable power tool unit. The power tool unit includes a drive unit, a mounting unit, and a transmission unit. The drive unit receives power from a power source and generates torque. The mounting unit is capable of mounting a tip tool. The transmission unit transmits the torque from the drive unit to the mounting unit and drives the mounting unit. The diagnostic method includes a storage step and a determination step. In the storage step, physical quantities relating to the power tool unit measured by a measuring unit are stored in the storage unit. In the determination step, replacement information regarding whether the tip tool needs to be replaced is obtained based on the physical quantities stored in the storage unit. The measurement unit includes a thrust load measurement unit that measures the thrust load applied to the tip tool as the physical quantity. In the determination step, the exchange information is obtained based on the thrust load stored in the memory unit.

[0007] A program according to one aspect of this disclosure is a program that causes one or more processors of a computer system to execute the diagnostic method. [Effects of the Invention]

[0008] This disclosure has the advantage of making it easier for users to determine if the efficiency of work using the power tool has deteriorated. [Brief explanation of the drawing]

[0009] [Figure 1]Figure 1 is a block diagram of an electric power tool system according to one embodiment. [Figure 2] Figure 2 is a perspective view of the power tool section of the same power tool system. [Figure 3] Figure 3 is a schematic diagram of the power tool section of the same power tool system. [Figure 4] Figure 4 is a schematic diagram illustrating the concept of the judgment range in the same power tool system in two dimensions. [Figure 5] Figure 5 is a flowchart showing the operation of the power tool section of the same power tool system. [Figure 6] Figure 6 is a flowchart showing the operation of the linked device for the same power tool system. [Modes for carrying out the invention]

[0010] (Embodiment) The following describes the electric tool system 100, diagnostic method, and program according to the embodiments, with reference to the drawings. However, the embodiments described below are only one of many embodiments of this disclosure. The embodiments described below can be modified in various ways depending on the design, etc., as long as the objectives of this disclosure are achieved. In addition, the figures described in the embodiments below are schematic diagrams, and the ratios of the size and thickness of each component in the figures do not necessarily reflect the actual dimensional ratios.

[0011] (overview) As shown in Figure 1, the power tool system 100 of this embodiment comprises a power tool unit 1, a measuring unit 4, a storage unit 62, and a determination unit 63. The power tool unit 1 is portable. The power tool unit 1 has a drive unit 31, a mounting unit 33, and a transmission unit 32. The drive unit 31 receives power from a power source P11 and generates torque. The mounting unit 33 can be fitted with a cutting tool. The transmission unit 32 transmits torque from the drive unit 31 to the mounting unit 33 and drives the mounting unit 33. The measuring unit 4 measures physical quantities related to the power tool unit 1. The storage unit 62 stores the physical quantities measured by the measuring unit 4. The determination unit 63 obtains replacement information regarding whether or not the cutting tool needs to be replaced based on the physical quantities stored in the storage unit 62.

[0012] According to this embodiment, users can determine from the exchange information whether the efficiency of work using the power tool unit 1 has deteriorated due to wear and tear of the tip tool, etc. This reduces the possibility of work efficiency deteriorating.

[0013] Furthermore, functions similar to those of the power tool system 100 can be realized through a diagnostic method. The diagnostic method of this embodiment is a diagnostic method for diagnosing a portable power tool unit 1. The power tool unit 1 has a drive unit 31, a mounting unit 33, and a transmission unit 32. The drive unit 31 receives power from a power source P11 and generates torque. The mounting unit 33 can be fitted with a cutting tool. The transmission unit 32 transmits torque from the drive unit 31 to the mounting unit 33 and drives the mounting unit 33. The diagnostic method has a storage step and a determination step. In the storage step, physical quantities related to the power tool unit 1 measured by the measurement unit 4 are stored in the storage unit 62. In the determination step, replacement information regarding whether or not the cutting tool needs to be replaced is obtained based on the physical quantities stored in the storage unit 62.

[0014] In addition, the diagnostic method can be implemented by a program. The program of the present embodiment is a program for causing one or more processors of a computer system to execute the diagnostic method. The program may be recorded on a non-temporary recording medium readable by the computer system.

[0015] (Details) (1) Overall configuration Hereinafter, the power tool system 100 will be described in more detail.

[0016] As shown in FIG. 1, the power tool system 100 includes a power tool unit 1 and a cooperation device 6.

[0017] The power tool unit 1 is a device to which a tip tool can be attached. The tip tool is, for example, a drill bit or a driver bit. A user (operator) uses the power tool unit 1 to perform operations such as drilling or screwing. Further, the power tool unit 1 is a portable device (a device used by hand).

[0018] In addition, the power tool unit 1 includes an impact mechanism 322 (see FIG. 3) that applies an impact to the mounting portion 33 using the torque from the drive portion 31. That is, the power tool unit 1 is an impact tool.

[0019] The cooperation device 6 includes a computer system. The cooperation device 6 is, for example, an industrial computer, a personal computer, a tablet computer, or a mobile phone such as a smartphone. The cooperation device 6 communicates with the power tool unit 1. The cooperation device 6 processes the information acquired from the power tool unit 1 and requests exchange information.

[0020] In particular, this embodiment will be described assuming that the power tool system 100 is used in an assembly line where multiple users assemble multiple workpieces. The power tool system 100 is equipped with multiple power tool units 1 (two in Figure 1), one of which power tool unit 1A is used by the first user, and the other power tool unit 1B is used by a second user who is different from the first user. Since the configurations of the two power tool units 1A and 1B are the same, unless otherwise specified, the following description will focus on one of the power tool units 1.

[0021] (2) Power tool section As shown in Figure 1, the power tool unit 1 includes an operating unit 3, a battery pack P1, a measuring unit 4, a communication unit 51, a storage unit 52, a processing unit 53, a notification unit 211, and a display unit 231. The operating unit 3 includes a mounting unit 33, a transmission unit 32, and a drive unit 31. Furthermore, as shown in Figures 2 and 3, the power tool unit 1 also includes a housing 2, a trigger switch 221, and a box 50.

[0022] (3) Housing The housing 2 houses the transmission section 32, the drive section 31, the measurement section 4, and the processing section 53, etc. The housing 2 has a housing section 21, a grip section 22, and a mounting section 23.

[0023] The housing section 21 has a cylindrical shape. The housing section 21 houses the transmission section 32, the drive section 31, the measuring section 4, and the like.

[0024] A notification unit 211 is held on the surface of the housing unit 21. The notification unit 211 includes, for example, an LED (Light Emitting Diode). To make it easy for the user to see the notification unit 211 while working, the notification unit 211 is provided at the end of the housing unit 21 opposite to the mounting portion 33 (see Figure 2). Based on the control of the processing unit 53, the notification unit 211 provides a notification prompting the user to change the tip tool, for example by lighting up or flashing.

[0025] The grip portion 22 protrudes from the outer circumferential surface of the housing portion 21 in one direction along the radial direction of the housing portion 21. The grip portion 22 is formed in a hollow cylindrical shape that is elongated in the aforementioned one direction. The grip portion 22 is the part that the user holds when performing tasks such as tightening screws. The trigger switch 221 is also held in the grip portion 22. The trigger switch 221 is a switch for controlling the on / off operation of the drive portion 31.

[0026] The storage section 21 is connected to one end of the grip section 22 in the longitudinal direction (upper end in Figure 2), and the mounting section 23 is connected to the other end (lower end in Figure 2).

[0027] Furthermore, the grip section 22 houses a box 50 (see Figure 3). The box 50 houses, for example, a communication unit 51 (see Figure 1), a storage unit 52, and a processing unit 53.

[0028] The battery pack P1 is detachably attached to the mounting section 23. In this embodiment, the battery pack P1 is included as a component of the power tool section 1, but it is not essential that the battery pack P1 be included as a component of the power tool section 1.

[0029] The battery pack P1 includes a primary or secondary battery as the power source P11. The power tool unit 1 operates using power supplied from the power source P11. Specifically, the power source P11 supplies power to drive the drive unit 31 (motor). The power source P11 also supplies power to operate the communication unit 51 and the processing unit 53, etc.

[0030] Furthermore, the mounting section 23 holds the display section 231. The display section 231 includes, for example, a display device such as a display for visually notifying information. The display section 231 is also integrated with the operation section 232. The operation section 232 includes, for example, a plurality of buttons. The operation section 232 accepts user input. The user can use the display section 231 to check various statuses related to the power tool unit 1. The user can use the display section 231 to check, for example, the operating mode of the power tool unit 1. The user can also use the operation section 232 to make various settings related to the power tool unit 1. The user can use the display section 231 to change, for example, the operating mode of the power tool unit 1.

[0031] (4) Drive parts The drive unit 31 shown in Figure 3 is, for example, a servo motor. The drive unit 31 converts electrical energy supplied from the power source P11 into torque. The torque and rotational speed of the drive unit 31 change according to the control by the control unit 531 (see Figure 1). The control unit 531 is a servo driver. The control unit 531 controls the operation of the drive unit 31 by feedback control, for example, to bring the torque and rotational speed of the drive unit 31 closer to target values.

[0032] The control unit 531 (see Figure 1) detects the amount of operation (pull-in amount) of the trigger switch 221 and controls the drive unit 31 according to the amount of operation. When the trigger switch 221 is pulled by the user, the drive unit 31 receives power from the power source P11 and operates, generating torque. In addition, the control unit 531 adjusts the target value of the rotational speed of the drive unit 31 (motor) according to the amount of operation of the trigger switch 221.

[0033] (5) Transmission site The transmission unit 32 transmits the torque from the drive unit 31 to the mounting unit 33. This causes the mounting unit 33 to rotate.

[0034] The transmission unit 32 includes, for example, a planetary gear mechanism 321 and an impact mechanism 322. The planetary gear mechanism 321 is a reduction gear. In other words, the transmission unit 32 rotates the mounting unit 33 at a rotational speed lower than the rotational speed of the drive unit 31.

[0035] The impact mechanism 322 is driven by the power of the drive unit 31. As shown in Figure 3, the impact mechanism 322 includes, for example, a hammer 322a rotatably supported by a drive shaft and an anvil 322b connected to the rear end of the mounting unit 33. The hammer 322a strikes the anvil 322b using torque transmitted from the drive unit 31.

[0036] The impact mechanism 322 applies a rotational impact to the mounting area 33 when the torque of the tip tool exceeds a predetermined level. This allows the tip tool to apply greater torque to the workpiece, such as a screw.

[0037] (6) Placement A cutting tool is attached to the mounting area 33. The cutting tool is, for example, a drill bit or a screwdriver bit. Various types of cutting tools may be attached to the mounting area 33 depending on the application, or only specific cutting tools may be attached.

[0038] When torque is transmitted from the drive unit 31 to the mounting unit 33 via the transmission unit 32, the tip tool rotates together with the mounting unit 33. This allows the user to perform tasks such as drilling or screwing using the power tool unit 1.

[0039] (7) Measurement section The measurement unit 4 measures physical quantities related to the power tool unit 1. More specifically, the measurement unit 4 measures physical quantities related to the operation of the tip tool. The measurement unit 4 in this embodiment includes a torque measurement unit 41, a rotational speed measurement unit 42, and a thrust load measurement unit 43.

[0040] The torque measuring unit 41 measures the torque applied to the tip tool as a physical quantity. More specifically, the torque measuring unit 41 measures the torque applied to the mounting portion 33 as a physical quantity equivalent to the torque applied to the tip tool.

[0041] The torque measurement unit 41 includes, for example, a magnetostrictive strain sensor or a resistive strain sensor.

[0042] The magnetostrictive strain sensor detects the change in magnetic permeability corresponding to the strain generated when torque is applied to the mounting area 33 using a coil installed in a non-rotating area near the mounting area 33, and outputs a voltage signal proportional to the strain.

[0043] The resistive strain sensor is attached to the surface of the mounting area 33. The resistive strain sensor converts the change in electrical resistance value corresponding to the strain generated when torque is applied to the mounting area 33 into a voltage signal and outputs it.

[0044] The rotational speed measurement unit 42 measures the rotational speed of the tip tool as a physical quantity. In this embodiment, the rotational speed of the tip tool matches the rotational speed of the mounting portion 33, and the rotational speed measurement unit 42 measures the rotational speed of the mounting portion 33. For example, a photoelectric encoder or a magnetic encoder can be used as the rotational speed measurement unit 42.

[0045] The thrust load measuring unit 43 measures the thrust load applied to the tip tool as a physical quantity. The thrust load is a load in the direction along the rotation axis of the mounting part 33. The thrust load is a physical quantity that depends on the magnitude of the force applied by the user to press the tip tool against the workpiece. In this embodiment, the thrust load measuring unit 43 measures the thrust load applied to the mounting part 33 as a physical quantity corresponding to the thrust load applied to the tip tool. The thrust load measuring unit 43 includes, for example, a pressure sensor such as a strain gauge attached to the mounting part 33.

[0046] (8) Communications Department The communication unit 51 (see Figure 1) includes a communication interface device. The communication unit 51 can communicate with the communication unit 61 of the cooperating device 6 via the communication interface device. In this disclosure, "communication possible" means that signals can be sent and received directly or indirectly via a network or repeater, etc., by an appropriate communication method such as wired communication or wireless communication.

[0047] (9) Storage section The storage unit 52 (see Figure 1) is a non-volatile storage device, such as a hard disk drive (HDD) or a solid-state drive (SSD). The storage unit 52 stores the physical quantities measured by the measurement unit 4.

[0048] (10) Processing The power tool unit 1 includes a computer system having one or more processors and memory. The processing unit 53 (see Figure 1) includes one or more processors of the power tool unit 1. The functions of the processing unit 53 are realized by the execution of a program recorded in memory by one or more processors of the processing unit 53. The program may be recorded in memory, provided via a telecommunication line such as the Internet, or provided on a non-temporary recording medium such as a memory card.

[0049] As shown in Figure 1, the processing unit 53 includes a control unit 531 and a limiting unit 532. Note that these merely represent the functions implemented by the processing unit 53 and do not necessarily represent an actual physical configuration.

[0050] The control unit 531 detects the amount of operation of the trigger switch 221 (see Figure 2) and controls the rotation speed of the drive unit 31 according to the amount of operation.

[0051] As described above, the notification unit 211 issues a notification prompting the replacement of the tool tip based on the control of the processing unit 53. The processing unit 53 decides whether or not to have the notification unit 211 issue a notification based on the replacement information obtained by the determination unit 63. In other words, the notification unit 211 issues a notification prompting the replacement of the tool tip based on the replacement information obtained by the determination unit 63.

[0052] The limiting unit 532 restricts (prohibits) the notification unit 211 from making notifications when the mounting part 33 is being driven. For example, the limiting unit 532 controls the notification unit 211 so that its LED does not light up or blink when the mounting part 33 is being driven.

[0053] Furthermore, the processing unit 53 performs a process to switch the operating mode of the power tool unit 1. The power tool unit 1 has at least two operating modes: a work mode and a learning mode. The work mode is the operating mode when the user uses the power tool unit 1 to perform tasks such as tightening screws. The work mode is, so to speak, the mode used during normal work. The learning mode is the operating mode used to create a learned model for the determination unit 63 to obtain replacement information regarding whether or not the tip tool needs to be replaced. This mode is preferably performed, for example, before the power tool unit 1 is used for the first time or before normal work.

[0054] The processing unit 53 may switch the operating mode based on, for example, user input to the operation unit 232, or based on operation input to something other than the operation unit 232, such as a DIP switch.

[0055] (11) Interconnection device As shown in Figure 1, the coordinating device 6 comprises a communication unit 61, a storage unit 62, and a determination unit 63.

[0056] The communication unit 61 includes a communication interface device. The communication unit 61 can communicate with the communication unit 51 of the power tool unit 1 via the communication interface device.

[0057] The storage unit 62 is a non-volatile storage device, such as a hard disk drive (HDD) or a solid-state drive (SSD). The storage unit 62 stores the physical quantities measured by the measurement unit 4.

[0058] The cooperating device 6 includes a computer system having one or more processors and memory. The determination unit 63 includes one or more processors of the cooperating device 6. The functions of the determination unit 63 are realized by one or more processors executing a program recorded in memory. The program may be recorded in memory, provided via a telecommunication line such as the Internet, or provided on a non-temporary recording medium such as a memory card.

[0059] The determination unit 63 includes a learning unit 64 and an inference unit 65. Note that the learning unit 64 and the inference unit 65 merely represent the functions realized by the determination unit 63 and do not necessarily represent an actual physical configuration.

[0060] The determination unit 63 obtains replacement information regarding whether or not the tip tool needs to be replaced. More specifically, the determination unit 63 obtains replacement information using machine learning.

[0061] The learning unit 64 is responsible for the learning phase to obtain exchange information. The learning unit 64 generates a trained model for obtaining exchange information.

[0062] The inference unit 65 is responsible for the inference phase to obtain exchange information. The inference unit 65 obtains exchange information based on the trained model.

[0063] (12) How to obtain exchange information The diagnostic method of this disclosure, that is, a series of processes for the determination unit 63 to obtain exchange information, will be explained below with reference to Figure 4.

[0064] The determination unit 63 may, for example, obtain exchange information at regular intervals, or it may obtain exchange information when it receives a command signal requesting exchange information.

[0065] When the power tool unit 1 is in work mode and a physical quantity is measured by the measurement unit 4, the processing unit 53 associates the physical quantity with the measurement so that it can be identified as having been obtained in work mode, and transmits the information of the physical quantity to the linkage device 6 via the communication unit 51. In the following description, the physical quantity obtained in work mode may be referred to as the "determination physical quantity." The storage unit 62 of the linkage device 6 stores the determination physical quantity.

[0066] When the operating mode of the power tool unit 1 is learning mode, the user who has performed work using the power tool unit 1 determines whether or not the tip tool has reached its replacement time. The processing unit 53 then prompts the user to input whether or not the tip tool has reached its replacement time. For example, the user determines whether or not the tip tool has reached its replacement time based on the length of time the tip tool has been used, the appearance of the tip tool, the workability of the work performed using the tip tool, and whether or not the work was performed normally. The user then inputs the determination result by, for example, operating the operation unit 232. Based on the input from the user, if the processing unit 53 determines that the tip tool has not reached its replacement time, it associates the physical quantity with the physical quantity so that it can be seen that the physical quantity was obtained in learning mode and that it is "normal". "Normal" here means that the tip tool has not reached its replacement time (there is no abnormality in the tip tool). The processing unit 53 then transmits the information of the physical quantity to the cooperating device 6 via the communication unit 51.

[0067] In this embodiment, if the processing unit 53 determines, based on user input, that the tip tool has reached its replacement time, it does not transmit information about the physical quantity to the linking device 6. However, even if it determines that the replacement time has been reached, the information about the physical quantity may be transmitted to the linking device 6 in a manner that indicates that the physical quantity was obtained in learning mode and that "the replacement time has been reached". When teaching that "the replacement time has been reached", the learning mode may be performed using a tip tool that has been used to some extent. The learning mode may also be performed by the linking device 6 or the manufacturer of the power tool unit 1, rather than by the user of the power tool unit 1. The information about the physical quantity obtained in the learning mode performed by the manufacturer may be transmitted from the manufacturer's server to the linking device 6 via an external network such as the Internet. In the following description, the physical quantity obtained in learning mode may be referred to as the "learning physical quantity". The storage unit 62 of the linking device 6 stores the learning physical quantity.

[0068] In learning mode, unlike in the work mode which is the mode used during normal operation, it is preferable that the determination of whether or not the tip tool has reached the time for replacement be made by a person with a certain level of skill, and that this be done multiple times in advance before the operator is allowed to perform normal work.

[0069] Furthermore, each of the multiple power tool units 1, including power tool units 1A and 1B, stores its own identification information in the storage unit 52, and the processing unit 53 associates its own identification information with the physical quantity information and transmits it to the linkage device 6. As a result, the linkage device 6 can identify which power tool unit 1 received the physical quantity information from using the identification information.

[0070] Furthermore, when the power tool unit 1 is in work mode and work is performed using the tip tool, the processing unit 53 transmits a determination physical quantity to the linking device 6 via the communication unit 51. Upon receiving the determination physical quantity, the linking device 6 automatically determines whether or not the tip tool has reached its replacement time. The processing unit 53 then receives the determination result from the linking device 6 and illuminates the notification unit 211 in different ways according to the determination result. For example, if the determination result indicates that "it is time to replace it," the processing unit 53 flashes the notification unit 211 red. On the other hand, if the determination result indicates that "it is not time to replace it (normal)," the processing unit 53 continuously illuminates the notification unit 211 green. The user can visually check whether or not the tip tool has reached its replacement time by observing the illumination status of the notification unit 211.

[0071] In learning mode, the memory unit 62 of the linked device 6 stores physical quantities for learning. The learning unit 64 extracts reference correlations (described later) from the physical quantities for learning. Then, the learning unit 64 sets reference information based on the extracted reference correlations and causes the memory unit 62 to store the reference information. In other words, the learning unit 64 sets reference information based on the physical quantities for learning.

[0072] Specifically, the learning unit 64 extracts (acquires) a reference correlation between multiple reference features, which are of different types and serve as criteria for determining the replacement of the tip tool, from the physical quantity used for learning. Here, "multiple features of different types" as used in this disclosure includes the first feature, the second feature, the third feature, the fourth feature, the fifth feature, and the sixth feature. The multiple reference features include the first to sixth features extracted from the physical quantity used for learning. In other words, as an example in this embodiment, the number of types (number of varieties) of the multiple features is six. However, the number of types of the multiple features may be one or more, and is not limited to six.

[0073] The reference information set by the learning unit 64 includes information on the judgment range R1 (see Figure 4) based on multiple reference correlations. The judgment range R1 is set by the learning unit 64 based on the learning physical quantities measured when a "normal" tip tool is used. The inference unit 65 determines whether the tip tool needs to be replaced by determining whether the measured correlation is within the judgment range R1. The measured correlation is the correlation between multiple measured features.

[0074] The learning unit 64 uses machine learning to set the judgment range R1. Specifically, the learning unit 64 sets the judgment range R1 using a trained model generated by a machine learning algorithm using artificial intelligence (AI). The trained model referred to here is a model generated by a computer system based on a training program from training data (training physical quantities).

[0075] In this embodiment, the first to third feature quantities are physical quantities measured by the measurement unit 4. Specifically, the first to third feature quantities are the torque, rotational speed, and thrust load of the cutting tool, respectively.

[0076] The fourth to sixth features in this embodiment are features based on at least one of the following: type information relating to the type of tool tip and material information relating to the material of the tool tip. The features based on at least one of the type information and material information are features common to both the measured features and the reference features.

[0077] Type information and material information are input to the control unit 232 of the power tool unit 1 by user operation, for example, and transmitted from the power tool unit 1 to the linking device 6. Alternatively, type information and material information may be input to the linking device 6 by user operation, or they may be input to the linking device 6 from an external terminal (such as a mobile terminal) of the power tool unit 1.

[0078] In this embodiment, the reference correlation between multiple reference features during the first operation, the reference correlation between multiple reference features during the second operation, ..., and the reference correlation between multiple reference features during the nth operation are linked for each operation and stored in the storage unit 62. The reference correlation may be stored in the storage unit 62 in the form of a data table, for example, as shown in [Table 1].

[0079] [Table 1]

[0080] The vertical columns in [Table 1] correspond to the reference correlations between multiple reference features. For example, in the example in [Table 1], the learning unit 64 extracts the reference correlations from the physical quantities during the first operation, such that when the first feature = A1, the second feature = B1, and when the first feature = A1, the third feature = C1.

[0081] In the example in [Table 1], multiple sets of reference features, each containing n sets of reference correlations, are stored in the memory unit 62. Note that n is a natural number greater than or equal to 1, and the memory unit 62 stores multiple sets of reference features, each containing one or more sets of reference correlations.

[0082] In this embodiment, the learning unit 64 stores the extracted reference correlations in the storage unit 62 and then calculates a variance-covariance matrix. The variance-covariance matrix in this embodiment is an example of a square matrix containing the variance and covariance associated with each of the first to sixth features (multiple features) in the set of reference features stored in the storage unit 62. Table 2 below is an example of a variance-covariance matrix calculated by the learning unit 64.

[0083] [Table 2]

[0084] As shown in [Table 2], in the variance-covariance matrix, the element in row n x n represents the variance of the nth feature, and the elements in row n x m and row m x n represent the covariances of the nth and m features, respectively. Note that n and m are numbers between 1 and 6, and are distinct from each other. For example, the element in row 1 x 6 and the element in row 6 x 1 in [Table 2] have the same value.

[0085] The learning unit 64 then calculates the inverse of the calculated variance-covariance matrix and sets a determination range R1 (see Figure 4) in which the Mahalanobis distance represented by d in equation (1) is less than or equal to a threshold. Here, the threshold is, for example, a value set in advance by the user. The user can register or change the threshold setting by, for example, performing an operation on the operation unit 232. It is preferable that the threshold is set within a range in which all of the multiple reference correlations stored in the storage unit 62 are included in the determination range R1. In other words, it is preferable that the threshold is greater than or equal to the maximum Mahalanobis distance among the multiple Mahalanobis distances in the multiple reference correlations stored in the storage unit 62.

[0086]

number

[0087] Here, x in equation (1) is the data to be judged, that is, multiple measured features (measured correlations) extracted from the physical quantity used for judgment. Σ in equation (1) -1 μ is the inverse of the variance-covariance matrix. Also, μ in equation (1) is the mean value of a set of multiple reference features stored in the memory unit 62. That is, the learning unit 64 sets the judgment range R1 based on the mean value of the set of multiple reference features stored in the memory unit 62, a threshold value set in advance by the user, and the inverse of the variance-covariance matrix.

[0088] The learning unit 64 then sets or updates reference information each time it acquires a physical quantity for learning, and stores the set or updated reference information in the storage unit 62. The reference information includes a judgment range R1 based on multiple reference correlations. In this embodiment, as an example, the reference information includes information on multiple reference feature groups extracted by the learning unit 64, information on the inverse matrix of the variance-covariance matrix calculated by the learning unit 64, and information on the judgment range R1.

[0089] The memory unit 62 stores the reference information set by the learning unit 64. The reference information is set based on the reference correlation relationship between multiple reference features, each of which is of a different type and serves as the basis for determining whether to replace the tip tool.

[0090] The determination unit 63 makes a determination regarding the replacement of the tip tool (determination step) based on the reference information stored in the memory unit 62 and the measured correlation between multiple measured features extracted from the determination physical quantity. When the determination physical quantity is input, the inference unit 65 of the determination unit 63 extracts (acquires) multiple measured features from the determination physical quantity, each of different types, which are the subject of the determination regarding the replacement of the tip tool. The types of the multiple measured features correspond to the types of the multiple reference features, and the multiple measured features include the first to sixth features extracted from the determination physical quantity.

[0091] The inference unit 65 extracts the measured correlation from the physical quantities used for determination, then refers to the reference information and calculates the Mahalanobis distance using equation (1). The inference unit 65 then determines whether the Mahalanobis distance is below a threshold, that is, whether the measured correlation is within the determination range R1.

[0092] Figure 4 is a schematic diagram illustrating the concept of the judgment range R1 in two dimensions, using the X-axis (horizontal axis) and Y-axis (vertical axis). More specifically, Figure 4 is a schematic diagram illustrating the concept of the judgment range R1 in two dimensions, using the first feature (vertical axis) and the second feature (horizontal axis). In this embodiment, the judgment range R1 can actually be set in six dimensions, using the first to sixth features. However, for the sake of clarity and ease of explanation, Figure 4 illustrates the judgment range R1 by focusing on only two of the first to sixth features.

[0093] Each of the multiple circular points F1 (plots) in Figure 4 represents a reference correlation between multiple reference features. Each of the multiple points F1 is extracted from a training physical quantity detected during a different operation. In other words, the multiple points F1 represent multiple sets of reference features. Each of the multiple triangular points F2 (plots) represents an observed correlation, for example, when the tool tip is degraded. Each of the multiple points F2 is extracted from a judgment physical quantity detected during a different operation. The judgment range R1 is the range in which the Mahalanobis distance is below a threshold. The inference unit 65 determines that the tool tip needs to be replaced when the observed correlation is outside the judgment range R1, as in the case of point F2, that is, when the Mahalanobis distance of the observed correlation is greater than the threshold. For example, as shown in Figure 4, the inference unit 65 determines that an increase in torque is an abnormality in the tool tip and determines that the tool tip needs to be replaced. On the other hand, the inference unit 65 determines that the tool tip is normal (the tool tip does not need to be replaced) when the measured correlation is within the determination range R1, that is, when the Mahalanobis distance of the measured correlation is less than or equal to the threshold.

[0094] In this way, the determination unit 63 determines exchange information based on the position of the physical quantity measured by the measurement unit 4 and stored in the storage unit 62 within the feature space (see Figure 4) relating to the feature quantities extracted from the physical quantities measured by the measurement unit 4 (i.e., whether or not the measured correlation is within the determination range R1). The exchange information is information regarding whether or not the tip tool needs to be replaced.

[0095] Furthermore, the determination unit 63 of this embodiment makes a determination regarding the replacement of the tip tool based on the correlation between multiple feature quantities of different types (as an example in Figure 4, the first feature quantity and the second feature quantity). This improves the determination accuracy compared to when the determination unit 63 makes a determination based on only one type of feature quantity.

[0096] After the determination unit 63 determines whether or not the cutting tool needs to be replaced, the determination unit 63 transmits replacement information representing the determination result to the power tool unit 1 via the communication unit 61. More specifically, the determination unit 63 transmits the determination result to the power tool unit 1 corresponding to the identification information, based on the identification information associated with the information of the physical quantity.

[0097] (13) Operation The operation of the power tool unit 1 of this embodiment will be described below with reference to Figure 5. The power tool unit 1 checks whether the operating mode is set to work mode or learning mode (S21).

[0098] The following describes the operation mode of the power tool unit 1 when it is in work mode (S21: work mode). The user performs tasks such as tightening screws using the power tool unit 1 (S22). Next, the processing unit 53 of the power tool unit 1 acquires the physical quantities detected by the measurement unit 4 during the work (S23). The processing unit 53 transmits information on the physical quantities for determination to the linkage device 6 via the communication unit 51 (S24). When the communication unit 51 receives the determination result from the linkage device 6 (S25), the processing unit 53 checks whether the determination result indicates a normal result (S26). If the determination result indicates a normal result (S26: Yes), the processing unit 53 lights up the notification unit 211 in green to notify that the tip tool has not yet reached the "replacement time" (S27), and terminates the process. On the other hand, if the determination result indicates that the "replacement time" has been reached (S26: No), the processing unit 53 lights up the notification unit 211 in red to notify that the tip tool has reached the "replacement time" (S28), and terminates the process.

[0099] Next, we will explain the case when the operating mode of the power tool unit 1 is in learning mode (S21: learning mode). The user performs a task such as tightening screws using the power tool unit 1 (S29). This task is assumed to be one in which the user has determined that the tip tool is functioning correctly. Next, the processing unit 53 of the power tool unit 1 acquires the physical quantities measured by the measurement unit 4 during the task (S30). The processing unit 53 transmits the information of the physical quantities for learning to the cooperating device 6 via the communication unit 51 (S31). Then, the power tool unit 1 terminates its processing.

[0100] Note that the flowchart shown in Figure 5 is merely an example, and the order of processing may be changed as appropriate, or processes may be added or deleted as appropriate. For example, the process of checking the operating mode of the power tool unit 1 in step S21 may be performed after the work performed by the power tool unit 1 (S22; S29) or after the acquisition of physical quantities by the processing unit 53 (S23; S30).

[0101] Next, the operation of the linkage device 6 in this embodiment will be described with reference to Figure 6. The linkage device 6 checks whether the communication unit 61 has acquired a physical quantity from the power tool unit 1 (S41). If the communication unit 61 has not acquired a physical quantity (S41: No), the linkage device 6 repeats the process of step S41 until the communication unit 61 acquires a physical quantity. If the communication unit 61 has acquired a physical quantity (S41: Yes), the determination unit 63 determines (confirms) whether the mode associated with that physical quantity is the learning mode or the work mode (S42).

[0102] If the mode determination result is learning mode (S42: learning mode), the communication unit 61 outputs learning physical quantities to the learning unit 64, and the learning unit 64 extracts the reference correlation between multiple reference features from the learning physical quantities (S43). The learning unit 64 then stores the multiple reference features as reference information in the storage unit 62, for example in the form of a data table (S44). Next, the learning unit 64 calculates the variance-covariance matrix of the multiple reference feature groups in the storage unit 62 (S45), and further calculates the inverse of the variance-covariance matrix (S46). Then, the learning unit 64 sets the determination range R1 based on the mean value of the multiple reference feature groups stored in the storage unit 62, a threshold value set in advance by the user, and the inverse of the variance-covariance matrix (S47). Once the determination range R1 is set, the learning unit 64 sets (updates) the reference information (S48) and terminates the process.

[0103] The processing in steps S43 to S48 is an example of the learning phase. During the learning phase, the collaborative device 6 extracts reference correlations between multiple reference features from the physical quantities used for learning, initializes (or updates) the reference information, and stores it in the storage unit 62.

[0104] On the other hand, in the processing of step S42, if the mode determination result is the working mode (S42: working mode), the communication unit 61 outputs a physical quantity for determination to the inference unit 65, and the inference unit 65 extracts the measured correlation between multiple measured features from the physical quantity for determination (S49). The inference unit 65 refers to the reference information obtained in the learning process and calculates the Mahalanobis distance using the mean value of multiple reference feature groups stored in the memory unit 62, the inverse matrix of the variance-covariance matrix, and the multiple measured features (S50). Then, the inference unit 65 checks whether the calculated Mahalanobis distance is below a threshold, that is, whether the measured correlation between multiple measured features is within the determination range R1 (S51). If the measured correlation is within the determination range R1 (S51: Yes), the inference unit 65 determines that the tool tip is normal, that is, that the tool tip has not yet reached the "replacement time" (S52), transmits a determination result to that effect (S53), and terminates the process. On the other hand, if the measured correlation is not within the determination range R1 (S51: No), the inference unit 65 determines that the tool tip has reached the "replacement time" (S54), transmits a determination result to that effect (S53), and terminates the process.

[0105] The processing in steps S49 to S54 is an example of the inference phase performed by the inference unit 65. The processing in steps S43 to S54 is an example of the determination step performed by the determination unit 63.

[0106] Note that the flowchart shown in Figure 6 is merely an example, and the order of processing may be changed as appropriate, or processes may be added or deleted as appropriate. For example, steps S45 to S48 in the learning mode may be performed after step S49 in the work mode.

[0107] The reference information may be pre-configured during the manufacturing and shipping of the power tool unit 1 or the linked device 6. In other words, it is not mandatory for the user of the power tool unit 1 to actually set the power tool unit 1 to learning mode and configure the reference information at the work site. However, if the user performs the initial configuration or update (re-learning) of the reference information, it may result in reference information that is more suitable for the usage environment.

[0108] In this embodiment, the communication unit 61 functions as an acquisition unit 610 (see Figure 1). The acquisition unit 610 acquires at least one of type information relating to the type of tool tip and material information relating to the material of the tool tip. The determination unit 63 determines replacement information based on the physical quantity stored in the storage unit 62 and at least one of the type information and material information acquired by the acquisition unit 610. More specifically, the determination unit 63 determines an actual feature quantity and a reference feature quantity based on at least one of the above, uses the reference feature quantity to determine the determination range R1, and determines replacement information based on the actual feature quantity and the determination range R1. By using type information and material information, for example, the influence of type information and material information on the torque magnitude of the tool tip can be reflected in the determination of whether or not the tool tip needs to be replaced.

[0109] (Variation 1) The following describes a modified example of the embodiment.

[0110] In this embodiment, the measurement unit 4 includes a torque measurement unit 41, a rotational speed measurement unit 42, and a thrust load measurement unit 43 that measures the thrust load applied to the tip tool as a physical quantity. The storage unit 62 stores the torque measured by the torque measurement unit 41, the rotational speed measured by the rotational speed measurement unit 42, and the thrust load measured by the thrust load measurement unit 43 as physical quantities. The determination unit 63 obtains exchange information based on the torque, rotational speed, and thrust load stored in the storage unit 62.

[0111] In contrast, the physical quantities measured by the measurement unit 4 may be, for example, one or two of torque, rotational speed, and thrust load. For example, the measurement unit 4 may have at least one of a torque measurement unit 41 that measures the torque applied to the tip tool as a physical quantity, and a rotational speed measurement unit 42 that measures the rotational speed of the tip tool as a physical quantity. In this case, the determination unit 63 obtains exchange information based on at least one of the torque measured by the torque measurement unit 41 and stored in the storage unit 62, and the rotational speed measured by the rotational speed measurement unit 42 and stored in the storage unit 62.

[0112] Furthermore, the physical quantities measured by the measuring unit 4 are not limited to torque, rotational speed, and thrust load. The physical quantities measured by the measuring unit 4 may include, for example, physical quantities related to the vibration of the tip tool or mounting part 33 (such as the magnitude of vibration).

[0113] In this embodiment, the physical quantities measured by the measurement unit 4 are torque, rotational speed, and thrust load, but the physical quantities measured by the measurement unit 4 may be one, two, or four or more.

[0114] (Other modifications of the embodiment) The following lists other modifications of the embodiment. These modifications may be implemented in appropriate combinations. Furthermore, these modifications may be implemented in appropriate combinations with Modification 1 described above.

[0115] The determination unit 63 may not use the physical quantities measured by the measurement unit 4 as features directly, but may extract different features based on the physical quantities.

[0116] The threshold for setting the judgment range R1 may be set by the learning unit 64 instead of being set by the user. For example, the learning unit 64 may set the judgment range R1 using the maximum Mahalanobis distance among multiple Mahalanobis distances in multiple reference correlations stored in the memory unit 62 as the threshold. Alternatively, the learning unit 64 may set the judgment range R1 based on the above maximum Mahalanobis distance. For example, the threshold for setting the judgment range R1 may be the value obtained by multiplying the above maximum Mahalanobis distance by a predetermined coefficient.

[0117] Reference information is not limited to information derived from physical quantities measured when the tool tip is functioning normally. For example, if the same tool tip is being used in the past and present, the degree of abnormality of the tool tip is likely to have been less in the past than it is now, so the reference information may be information derived from physical quantities measured in the past.

[0118] In the above embodiment, the case in which the Mahalanobis distance is used as the cluster analysis method, that is, as the "distance" from the normal data set, was described. However, the determination unit 63 may also make a determination as to whether or not the tip tool needs to be replaced based on the correlation between two or more features from a plurality of features of different types, without using the Mahalanobis distance.

[0119] In this embodiment, the processing for obtaining exchange information is performed by the cooperating device 6. Alternatively, the processing for obtaining exchange information may be performed by the processing unit 53 of the power tool unit 1.

[0120] The transmission section 32 does not necessarily have to include an impact mechanism.

[0121] The notification unit 211 is not limited to a configuration that appeals to the user's visual sense, but may also provide notification through sound (voice, etc.) or vibration. Furthermore, the notification unit 211 may be implemented as a transmitter or the like that transmits a notification signal to an external terminal (mobile terminal, etc.) of the power tool unit 1.

[0122] The notification unit 211 may also be provided by the coordinating device 6.

[0123] The notification unit 211, which provides notifications based on exchange information, is not an essential component of the power tool system 100. The power tool system 100 may, for example, store the exchange information determined by the determination unit 63 in the storage unit 62. The exchange information may also be used, for example, by a computer system to create a plan for the management of cutting tools (ordering and exchange, etc.).

[0124] The entity that executes the power tool system 100 or diagnostic method in this disclosure includes a computer system. The computer system mainly consists of a processor and memory as hardware. At least part of the functions of the entity that executes the power tool system 100 or diagnostic method in this disclosure are realized by the processor executing a program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, provided via a telecommunications line, or provided on a non-temporary recording medium such as a memory card, optical disk, or hard disk drive that can be read by the computer system. The processor of the computer system consists of one or more electronic circuits including semiconductor integrated circuits (ICs) or large-scale integrated circuits (LSIs). The integrated circuits such as ICs or LSIs referred to here are named differently depending on the degree of integration, and include integrated circuits called system LSIs, VLSIs (Very Large Scale Integration), or ULSIs (Ultra Large Scale Integration). Furthermore, FPGAs (Field-Programmable Gate Arrays) that are programmed after the manufacture of the LSI, or logic devices that can reconfigure the junction relationships inside the LSI or reconfigure the circuit compartments inside the LSI, can also be used as processors. Multiple electronic circuits may be integrated onto a single chip or distributed across multiple chips. Multiple chips may be integrated onto a single device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller also consists of one or more electronic circuits, including semiconductor integrated circuits or large-scale integrated circuits.

[0125] Furthermore, multiple functions of the collaborative device 6 may be distributed across multiple devices. In addition, at least some functions of the collaborative device 6 may be implemented by a server or cloud (cloud computing), etc.

[0126] Furthermore, the configuration of the power tool system 100 may be distributed across multiple devices. For example, the power tool unit 1, which has at least an operating unit 3, may be provided separately from at least one of the following: the measuring unit 4, the communication unit 51, the storage unit 52, the notification unit 211, the presentation unit 231, and the processing unit 53.

[0127] Furthermore, in the embodiment, at least some of the functions of the power tool system 100, which are distributed between the linking device 6 and the power tool unit 1, may be integrated into a single device. For example, in the embodiment, the linking device 6 is provided separately from the power tool unit 1, and the linking device 6 includes a determination unit 63. Alternatively, the power tool unit 1 may include a determination unit 63. In this case, the linking device 6 does not have to be a component of the power tool system 100. Or, the power tool unit 1 may include some of the functions of the determination unit 63 (for example, the functions of the learning unit 64).

[0128] (summary) Based on the embodiments described above, the following aspects are disclosed.

[0129] The power tool system (100) according to the first embodiment comprises a power tool unit (1), a measuring unit (4), a storage unit (62), and a determination unit (63). The power tool unit (1) is portable. The power tool unit (1) has a drive unit (31), a mounting unit (33), and a transmission unit (32). The drive unit (31) receives power from a power source (P11) and generates torque. The mounting unit (33) can be fitted with a cutting tool. The transmission unit (32) transmits torque from the drive unit (31) to the mounting unit (33) and drives the mounting unit (33). The measuring unit (4) measures physical quantities related to the power tool unit (1). The storage unit (62) stores the physical quantities measured by the measuring unit (4). The determination unit (63) obtains replacement information regarding whether or not the tip tool needs to be replaced, based on the physical quantities stored in the memory unit (62).

[0130] With the above configuration, users can determine from the replacement information whether the efficiency of work using the power tool unit (1) is deteriorating due to wear and tear on the tip tool, etc. This reduces the possibility of work efficiency deteriorating.

[0131] Furthermore, the power tool system (100) according to the second embodiment further comprises a notification unit (211) in the first embodiment. The notification unit (211) provides a notification prompting the replacement of the tip tool based on the replacement information obtained by the determination unit (63).

[0132] With the above configuration, users can determine whether or not it is necessary to replace the tip tool.

[0133] Furthermore, the power tool system (100) according to the third embodiment further comprises a limiting unit (532) in the second embodiment. The limiting unit (532) restricts the notification unit (211) from making notifications when the mounting part (33) is being driven.

[0134] With the above configuration, when an operator is working with the power tool unit (1), the possibility that a notification from the notification unit (211) will attract the operator's attention and interfere with the work can be reduced.

[0135] Furthermore, in the power tool system (100) according to the fourth embodiment, in any one of the first to third embodiments, the measuring unit (4) has at least one of a torque measuring unit (41) and a rotational speed measuring unit (42). The torque measuring unit (41) measures the torque applied to the tip tool as a physical quantity. The rotational speed measuring unit (42) measures the rotational speed of the tip tool as a physical quantity.

[0136] With the above configuration, the determination unit (63) can more accurately determine replacement information regarding whether or not the tip tool needs to be replaced.

[0137] Furthermore, in the power tool system (100) according to the fifth embodiment, in the fourth embodiment, the measuring unit (4) includes a torque measuring unit (41), a rotational speed measuring unit (42), and a thrust load measuring unit (43). The thrust load measuring unit (43) measures the thrust load applied to the tip tool as a physical quantity. The determination unit (63) obtains exchange information based on the torque, rotational speed, and thrust load stored in the memory unit (62).

[0138] With the above configuration, the determination unit (63) can more accurately determine replacement information regarding whether or not the tip tool needs to be replaced.

[0139] Furthermore, the power tool system (100) according to the sixth embodiment further comprises an acquisition unit (610) in any one of the first to fifth embodiments. The acquisition unit (610) acquires at least one of type information relating to the type of tip tool and material information relating to the material of the tip tool. The determination unit (63) determines exchange information based on the physical quantity stored in the storage unit (62) and at least one of the type information and material information acquired by the acquisition unit (610).

[0140] With the above configuration, the determination unit (63) can more accurately determine replacement information regarding whether or not the tip tool needs to be replaced.

[0141] Furthermore, in the power tool system (100) according to the seventh embodiment, in any one of the first to sixth embodiments, the determination unit (63) obtains exchange information based on the position of the physical quantity stored in the memory unit (62) in the feature space relating to the feature quantity extracted from the physical quantity.

[0142] With the above configuration, the determination unit (63) can more accurately determine replacement information regarding whether or not the tip tool needs to be replaced.

[0143] Configurations other than those in the first embodiment are not essential to the power tool system (100) and can be omitted as appropriate.

[0144] Furthermore, the diagnostic method relating to the eighth aspect is a diagnostic method for diagnosing a portable power tool unit (1). The power tool unit (1) has a drive unit (31), a mounting unit (33), and a transmission unit (32). The drive unit (31) receives power from a power source (P11) and generates torque. The mounting unit (33) can be fitted with a cutting tool. The transmission unit (32) transmits torque from the drive unit (31) to the mounting unit (33) and drives the mounting unit (33). The diagnostic method has a memory step and a determination step. In the memory step, physical quantities relating to the power tool unit (1) measured by the measuring unit (4) are stored in the memory unit (62). In the determination step, replacement information regarding whether or not the cutting tool needs to be replaced is obtained based on the physical quantities stored in the memory unit (62).

[0145] With the above configuration, users can determine from the replacement information whether the efficiency of work using the power tool unit (1) is deteriorating due to wear and tear on the tip tool, etc. This reduces the possibility of work efficiency deteriorating.

[0146] Furthermore, the program relating to the ninth aspect is a program that causes one or more processors of a computer system to execute the diagnostic method relating to the eighth aspect.

[0147] With the above configuration, users can determine from the replacement information whether the efficiency of work using the power tool unit (1) is deteriorating due to wear and tear on the tip tool, etc. This reduces the possibility of work efficiency deteriorating.

[0148] Not limited to the above embodiments, various configurations (including modifications) of the power tool system (100) according to the embodiment can be embodied in a diagnostic method, a (computer) program, or a non-temporary recording medium on which the program is recorded. [Explanation of Symbols]

[0149] 1 Power tool section 4. Measurement Unit 31 Drive parts 32 Transmission sites 33 Placement site 41 Torque measurement unit 42. Rotational speed measurement unit 43. Thrust load measurement section 62 Storage section 63 Judgment section 100 Power Tool Systems 211 Notification Department 532 Restriction section 610 Acquisition Department P11 Power source

Claims

1. Portable power tool unit, Measurement unit, Memory unit and, It comprises a determination unit and, The aforementioned power tool unit is A drive unit that receives power from a power source and generates torque, Mounting area where a cutting tool can be attached, It has a transmission unit that transmits the torque from the drive unit to the mounting unit and drives the mounting unit, The measurement unit measures physical quantities related to the power tool unit, The storage unit stores the physical quantity measured by the measurement unit, The determination unit obtains replacement information regarding whether or not the tip tool needs to be replaced, based on the physical quantity stored in the storage unit. The measurement unit includes a thrust load measurement unit that measures the thrust load applied to the tip tool as the physical quantity, The determination unit determines the exchange information based on the thrust load stored in the memory unit. Power tool system.

2. The system further includes a notification unit that prompts the replacement of the tip tool based on the replacement information obtained by the determination unit. The power tool system according to claim 1.

3. The system further includes a limiting unit that restricts the notification unit from making the notification when the mounting part is being driven. The power tool system according to claim 2.

4. The aforementioned measuring unit is A torque measuring unit that measures the torque applied to the tip tool as the physical quantity, A rotation speed measuring unit that measures the rotation speed of the tip tool as the physical quantity, and at least one of the above, The power tool system according to claim 1.

5. The determination unit determines the exchange information based on the torque, rotational speed, and thrust load stored in the storage unit. The power tool system according to claim 4.

6. The system further includes an acquisition unit that acquires at least one of the following: type information relating to the type of the tip tool and material information relating to the material of the tip tool. The determination unit determines the exchange information based on the physical quantity stored in the storage unit and at least one of the type information and material information acquired by the acquisition unit. The power tool system according to claim 1.

7. The determination unit determines the exchange information based on the position of the physical quantity stored in the memory unit within the feature space relating to the feature quantity extracted from the physical quantity. The power tool system according to claim 1.

8. A drive unit that receives power from a power source and generates torque, Mounting area where a cutting tool can be attached, A diagnostic method for diagnosing a portable power tool unit having a transmission unit that transmits the torque from the drive unit to the mounting unit and drives the mounting unit, A storage step in which the physical quantities related to the power tool measured by the measurement unit are stored in the storage unit, The system includes a determination step of determining whether or not the tip tool needs to be replaced based on the physical quantity stored in the memory unit, The measurement unit includes a thrust load measurement unit that measures the thrust load applied to the tip tool as the physical quantity, In the determination step, the exchange information is determined based on the thrust load stored in the memory unit. Diagnostic methods.

9. To cause one or more processors of a computer system to execute the diagnostic method described in claim 8, program.

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