WO2024052979A1 - 切削システムおよび転削工具の状態判定方法 - Google Patents

切削システムおよび転削工具の状態判定方法 Download PDF

Info

Publication number
WO2024052979A1
WO2024052979A1 PCT/JP2022/033386 JP2022033386W WO2024052979A1 WO 2024052979 A1 WO2024052979 A1 WO 2024052979A1 JP 2022033386 W JP2022033386 W JP 2022033386W WO 2024052979 A1 WO2024052979 A1 WO 2024052979A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
milling tool
strain
acceleration
shaft portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/033386
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
雄介 小池
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP2023500445A priority Critical patent/JP7260077B1/ja
Priority to CN202280099494.6A priority patent/CN119768249A/zh
Priority to PCT/JP2022/033386 priority patent/WO2024052979A1/ja
Priority to EP22958058.4A priority patent/EP4585366A4/en
Publication of WO2024052979A1 publication Critical patent/WO2024052979A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/09—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool
    • B23Q17/0952—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool during machining
    • B23Q17/0966—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool during machining by measuring a force on parts of the machine other than a motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C9/00—Details or accessories so far as specially adapted to milling machines or cutter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/09—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool
    • B23Q17/0952—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool during machining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/09—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool
    • B23Q17/0952—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool during machining
    • B23Q17/0957—Detection of tool breakage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/10—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting speed or number of revolutions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
    • B23Q17/2233—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work for adjusting the tool relative to the workpiece
    • B23Q17/2241—Detection of contact between tool and workpiece
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Program-control systems
    • G05B19/02—Program-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of program data in numerical form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2260/00—Details of constructional elements
    • B23C2260/76—Sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft

Definitions

  • the present disclosure relates to a cutting system and a method for determining the condition of a milling tool.
  • Patent Document 1 discloses a milling tool that includes a plurality of sensors including an acceleration sensor and a strain sensor in a tool holder.
  • a cutting system includes a milling tool, a plurality of sensors attached to the milling tool, and a management device.
  • the management device determines the state of the milling tool based on sensor information from the plurality of sensors.
  • the plurality of sensors includes at least one acceleration sensor and at least one strain sensor.
  • the management device determines whether or not the milling tool rotates based on sensor information from at least one acceleration sensor, and determines whether or not the milling tool is in contact with a workpiece based on sensor information from at least one strain sensor. Determine the presence or absence.
  • the method according to the present disclosure is a method of determining the state of a milling tool. At least one acceleration sensor and at least one strain sensor are arranged on the milling tool. The method includes the steps of: acquiring sensor information from at least one acceleration sensor and at least one strain sensor; determining whether the milling tool is rotating based on the sensor information from the at least one acceleration sensor; The method includes a step of determining whether or not there is contact between the milling tool and the workpiece based on sensor information from one strain sensor.
  • FIG. 1 is a diagram showing an outline of a cutting system according to the present embodiment.
  • FIG. 2 is a diagram showing a milling tool in which a shaft portion is attached to a tool holder.
  • FIG. 3 is a diagram showing the arrangement of sensors when the milling tool is viewed from the positive direction of the Z-axis.
  • FIG. 4 is a diagram showing an example of detection signals of each sensor when the rotational speed of the milling tool is changed in a no-load state.
  • FIG. 5 is a diagram for explaining the state of the milling tool based on the detection signals of each sensor.
  • FIG. 6 is a flowchart for explaining the processing for determining the state of the milling tool, which is executed by the management device.
  • FIG. 7 is a diagram showing a modified example of a milling tool.
  • An object of the present disclosure is to provide a cutting system and method that can determine the state of a milling tool based on information from a plurality of sensors attached to the milling tool.
  • a cutting system 50 includes a milling tool 100, a plurality of sensors 120 and 130, and a management device 200.
  • Milling tool 100 includes a shaft portion 106 having a first end portion 107 provided with a blade portion for cutting a workpiece 18 and a second end portion 108 attached to tool holder 105 .
  • the plurality of sensors 120 and 130 are attached to the shaft portion 106 of the milling tool 100.
  • the management device 200 determines the state of the milling tool 100 based on sensor information from the plurality of sensors 120 and 130.
  • the plurality of sensors includes at least one acceleration sensor 120 and at least one strain sensor 130.
  • the management device 200 determines whether or not the milling tool 100 rotates based on sensor information from at least one acceleration sensor 120, and determines whether or not the milling tool 100 rotates based on sensor information from at least one strain sensor 130. Determine whether there is contact with an object.
  • the tool holder 105 and the milling tool 100 rotate with the axial direction of the shaft portion 106 as a rotation axis.
  • At least one acceleration sensor 120 is arranged to detect centrifugal acceleration of milling tool 100.
  • the plurality of sensors include the plurality of acceleration sensors 120.
  • the plurality of acceleration sensors 120 are arranged on concentric circles centered on the rotation axis of the shaft portion 106 in the same plane having the rotation axis as a normal line.
  • the plurality of acceleration sensors 120 are four acceleration sensors arranged at positions where the interval between the centers of the acceleration sensors 120 is 90° in the circumferential direction of the shaft portion 106. 120 included.
  • the management device 200 determines that the milling tool 100 is rotating. Moreover, the management device 200 determines that the milling tool 100 is stopped when the acceleration detected by at least one acceleration sensor 120 is less than the first threshold value.
  • the milling tool 100 rotates with the axial direction of the shaft portion 106 as the rotation axis. Furthermore, at least one strain sensor 130D is arranged to detect strain in the circumferential direction of the shaft portion 106.
  • the plurality of sensors include the plurality of strain sensors 130.
  • the plurality of strain sensors 130 are arranged on a concentric circle centered on the rotation axis of the shaft portion 106 within the same plane having the rotation axis as a normal line.
  • the plurality of strain sensors 130 are four strain sensors 130A arranged at positions where the interval between the center portions of the strain sensors is 90° in the circumferential direction of the shaft portion 106. Including ⁇ 130D.
  • the management device 200 determines that the strain in the circumferential direction of the shaft portion 106 detected by the at least one strain sensor 130D is If it is larger than the threshold value, it is determined that the milling tool 100 is in contact with the workpiece 18 . In addition, the management device 200 determines that the milling tool 100 is in contact with the workpiece 18 when the circumferential strain of the shaft portion 106 detected by the at least one strain sensor 130D is less than a second threshold. It is determined that there is no.
  • the milling tool 100 rotates with the axial direction of the shaft portion 106 as the rotation axis.
  • At least one acceleration sensor 120 and at least one strain sensor 130 are arranged alternately in the circumferential direction of shaft portion 106.
  • the management device 200 controls the cutting tool 100 based on the sensor information from at least one acceleration sensor 120 and the sensor information from at least one strain sensor 130. It is determined whether cutting is in progress or not.
  • the management device 200 determines that the acceleration detected by at least one acceleration sensor 120 is greater than the first threshold value, and that the acceleration is detected by at least one strain sensor 130. When the distortion in the circumferential direction of the shaft portion 106 is larger than the second threshold value, it is determined that the milling tool 100 is cutting.
  • the management device 200 determines that the acceleration detected by the at least one acceleration sensor 120 is less than the first threshold and the acceleration detected by the at least one strain sensor 130. If the strain in the circumferential direction of the shaft portion 106 that has been applied is larger than the second threshold value, it is determined that the milling tool 100 is in an abnormal state.
  • the management device 200 determines that the acceleration detected by at least one acceleration sensor 120 is greater than the first threshold and the acceleration detected by at least one strain sensor 130 is If the strain in the circumferential direction of the shaft portion 106 is less than the second threshold value, it is determined that the milling tool 100 is rotating without cutting.
  • the milling tool 100 has a first end portion 107 provided with a blade portion for cutting the workpiece 18 and a second end portion 107 attached to the tool holder 105.
  • the shaft portion 106 has an end portion 108 .
  • the management device 200 corrects the measured value of the at least one strain sensor 130 to zero at a timing when the axial strain of the shaft portion 106 detected by the at least one strain sensor 130 is less than the second threshold.
  • the cutting system 50 according to any one of (1) to (16) above is attached to the tool holder 105 and has a wireless communication system for transmitting sensor information from the plurality of sensors 120 and 130 to the management device 200. It further includes a communication device 140.
  • the cutting system 50 according to any one of (1) to (17) above is attached to the tool holder 105 and configured to supply power for driving the plurality of sensors 120 and 130. It further includes a power storage device 150.
  • the management device 200 further includes a storage device 230 for storing sensor information from the plurality of sensors 120 and 130.
  • the management device 200 stores sensor information from the plurality of sensors 120 and 130 in the storage device 230 with label information corresponding to the state of the milling tool 100.
  • the management device 200 stores in advance the state transition of the milling tool 100 from the start of machining of the workpiece 18 to the completion of machining.
  • the management device 200 classifies the sensor information stored in the storage device 230 as a processing data group for each object to be cut 18 based on the state transition and label information.
  • the management device 200 stores in advance the state transition of the milling tool 100 from the start of machining of the workpiece 18 to the completion of machining as first data. If the second data indicating the state transition of the milling tool 100 obtained from the sensor information acquired from the start of machining to the completion of the machining of the workpiece 18 does not match the first data, the management device 200 provides the user with information on the workpiece. A processing abnormality of the cut object 18 is notified.
  • the method according to the present disclosure provides a milling tool including a shaft portion 106 having a first end portion provided with a blade portion for cutting a workpiece, and a second end portion attached to a machine tool.
  • This is a method of determining the status of 100.
  • At least one acceleration sensor 120 and at least one strain sensor 130 are arranged on the shaft portion 106.
  • the method includes the steps of acquiring sensor information from at least one acceleration sensor 120 and at least one strain sensor 130, and determining whether or not the milling tool 100 is rotating based on the sensor information from the at least one acceleration sensor 120. and a step of determining whether there is contact between the milling tool 100 and the workpiece 18 based on sensor information from at least one strain sensor 130.
  • FIG. 1 is a diagram showing an outline of a cutting system 50 according to this embodiment.
  • cutting system 50 includes a milling tool 100 and a management device 200.
  • the milling tool 100 is attached to a machine tool 10 such as a machining center or a milling machine, and is used for cutting a workpiece 18 to be cut.
  • the machine tool 10 in the example of FIG. 1 is a vertical machining center, and a milling tool 100 is attached to a main shaft (spindle) 14 provided on a head 12 that moves in the vertical direction (Z-axis direction).
  • a milling tool 100 includes a shaft portion 106 in which a blade portion is formed and a tool holder 105 that holds the shaft portion 106 , and a portion of the tool holder 105 is attached to the machine tool 10 .
  • the shaft portion 106 provided with the cutting insert 160 may be directly attached to the machine tool 10 without using the tool holder 105, as in a modification described later with reference to FIG.
  • a motor (not shown) disposed on the main shaft 14 rotates the milling tool 100 with the Z-axis direction as the rotation axis.
  • the work 18 is placed on the table 16 provided on the bed 20.
  • the table 16 is configured to be movable on the XY plane.
  • the workpiece 18 is cut by moving the table 16 and the head 12 to change the relative position of the milling tool 100 and the workpiece 18 while bringing the rotating milling tool 100 into contact with the workpiece 18.
  • a three-axis vertical machining center is used as an example of the machine tool 10, but the machine tool 10 may be a horizontal machining center with the main axis arranged horizontally, or a four-axis or more vertical machining center. It may also have a motion axis.
  • a plurality of sensors are attached to the milling tool 100.
  • the sensor can detect the force applied to the milling tool 100.
  • the management device 200 determines and manages the state of the milling tool 100 using the detected value of the sensor attached to the milling tool 100.
  • the management device 200 includes a communication device 210, a CPU (Central Processing Unit) 220 that is a control device, a storage device 230, an input/output interface (I/F) 240, a display device 260, and an input device 270. .
  • CPU Central Processing Unit
  • I/F input/output interface
  • the communication device 210, CPU 220, storage device 230, and input/output I/F 240 are connected to a common bus 250 and are configured to be able to exchange signals with each other.
  • the display device 260 and the input device 270 are connected to the input/output I/F 240 by wire or wirelessly.
  • the communication device 210 is a wireless communication device, and wirelessly acquires the detection value of the sensor attached to the tool holder 105.
  • the CPU 220 executes a program stored in the storage device 230 and processes the sensor detection value obtained by the communication device 210 to determine the state of the milling tool 100.
  • the storage device 230 includes memories such as ROM (Read Only Memory) and RAM (Random Access Memory), as well as HDD (Hard Disc Drive) or SSD (Solid State Disk). including mass storage devices such as The storage device 230 is used as a buffer during processing by the CPU 220, and is also used to store programs executed by the CPU 220, sensor detection values, and/or calculation results by the CPU 220.
  • ROM Read Only Memory
  • RAM Random Access Memory
  • HDD Hard Disc Drive
  • SSD Solid State Disk
  • the input device 270 is, for example, a keyboard, a mouse, a trackball, or a pointing device such as a touch panel, and receives operation signals from the user.
  • the display device 260 is typically a liquid crystal panel or an organic EL (Electro Luminescence) panel, and displays the calculation results of the CPU 220 and the information stored in the storage device 230 to the user.
  • the input/output I/F 240 is an interface for connecting the display device 260 and the input device 270. Via the input/output I/F 240, it receives a user operation signal from the input device 270 and outputs information to notify the user to the display device 260.
  • Milling tools used in machine tools such as those described above may have abnormalities such as wear or breakage of the blade portion with use. If an abnormality occurs in the milling tool, the workpiece to be cut may not be properly cut, leading to a decrease in machining accuracy or damage to the workpiece or tool itself.
  • Patent Document 1 a plurality of sensors including an acceleration sensor and a strain sensor are provided in a tool holder that holds a milling tool, and the A configuration is known in which it is determined whether the cause of a cutting defect is caused by a milling tool or a machine tool, based on data of detected physical quantities.
  • FIG. 2 is a diagram showing the milling tool 100 in which the shaft portion 106 is attached to the tool holder 105.
  • FIG. 3 is a diagram showing the arrangement of each sensor when the milling tool 100 is viewed from the positive direction of the Z-axis.
  • the tool holder 105 includes a main body 110 that is attached to the main shaft 14 of the machine tool 10. One end of the main body 110 is attached to the main shaft 14 . A shaft portion 106 is attached to the other end of the main body 110.
  • the milling tool 100 is, for example, an end mill, a milling cutter, a drill, a reamer, a tap, etc., and cuts the workpiece 18 by rotating itself.
  • the milling tool 100 is an end mill, in which a blade portion is provided at the first end 107 of a substantially cylindrical shaft portion 106, and the second end 108 of the shaft portion 106 is attached to the tool holder 105. installed.
  • the blade portion may be formed on the shaft portion 106, or a removable cutting edge portion may be attached to the shaft portion 106.
  • the milling tool 100 rotates clockwise (CW) around the rotation axis CL when viewed from the positive direction of the Z-axis. , the workpiece 18 is cut by the blade portion and the workpiece 18 coming into contact with each other.
  • a plurality of sensors 120 and 130 are attached around the shaft portion 106.
  • the plurality of sensors includes four acceleration sensors 120 and four strain sensors 130.
  • a communication device 140 and a battery 150 are arranged on a substrate (not shown).
  • Communication device 140 is a wireless communication device powered by battery 150. The communication device 140 can wirelessly communicate with the communication device 210 of the management device 200, and wirelessly transmits detection values detected by the sensors 120 and 130 to the management device 200.
  • the sensors 120 and 130 may be directly attached to the shaft portion 106, or may be placed on the tool holder 105 that can measure the deformation state of the milling tool 100. In FIG. 3, for ease of explanation, a state in which the sensors 120 and 130 are directly attached to the shaft portion 106 will be described.
  • the four acceleration sensors 120 are arranged on the surface of the shaft portion 106 at positions where the intervals between the center portions of the acceleration sensors 120 are 90° in the circumferential direction. That is, the four acceleration sensors 120 are arranged on concentric circles centered on the rotation axis CL of the shaft portion 106 within the same plane having the rotation axis CL as the normal line. When viewed in plan from the Z-axis direction, two of the four acceleration sensors 120 are arranged point-symmetrically with respect to the rotation axis CL of the milling tool 100. Further, the remaining two of the four acceleration sensors 120 are also arranged point-symmetrically with respect to the rotation axis CL of the milling tool 100. Each acceleration sensor 120 has measurement sensitivity at least in the radial direction and can detect centrifugal acceleration when the milling tool 100 rotates.
  • the four strain sensors 130 include strain sensors 130A to 130D. Like the acceleration sensor 120, the strain sensors 130A to 130D are arranged on concentric circles centered on the rotation axis CL of the shaft portion 106 in the same plane with the rotation axis CL as the normal line. Further, the strain sensors 130A to 130D are respectively arranged on the surface of the shaft portion 106 at positions where the distance between the center portions of the strain sensors is 90° in the circumferential direction. In the example of FIG. 3, each of the strain sensors 130A to 130D is arranged between two adjacent acceleration sensors. Note that if the acceleration sensor 120 and the strain sensor 130 are not placed on the same plane, they may be placed at the same position when viewed from the Z-axis direction. may have been done.
  • Strain sensor 130A and strain sensor 130C are arranged point-symmetrically with respect to rotation axis CL of milling tool 100. Further, the strain sensor 130B and the strain sensor 130D are also arranged point-symmetrically with respect to the rotation axis CL of the milling tool 100.
  • the strain sensors 130A to 130C are arranged so as to have measurement sensitivity in the vertical direction (Z-axis direction). Therefore, the strain sensors 130A to 130C can detect the deflection of the shaft portion 106 when a force perpendicular to the Z-axis direction is applied to the milling tool 100.
  • the strain sensor 130D is arranged so as to have measurement sensitivity in the circumferential direction (shear direction). Therefore, the strain sensor 130D can detect the force acting on the milling tool 100 in the circumferential direction, that is, the rotational torque.
  • FIG. 4 is a diagram showing an example of detection signals of the sensors 120 and 130 when the rotational speed of the milling tool 100 is changed in a no-load state.
  • the upper part of FIG. 4 shows the strain detected by the strain sensor 130 (lines LN10, LN20), and the lower part of FIG. 4 shows the acceleration detected by the acceleration sensor 120 (line LN30). ).
  • Time is shown on the horizontal axis, and from time t1 to t5, the rotational speed of the milling tool 100 increases stepwise with time, and from time t6 to t11, the rotational speed of the milling tool 100 increases stepwise with time. has been reduced.
  • a line LN10 indicates the vertical strain in the vertical direction (Z-axis direction) caused by the strain sensors 130A to 130C.
  • line LN20 indicates the circumferential distortion caused by the strain sensor 130D.
  • the vertical strain detected by the strain sensors 130A to 130C changes according to the rotation speed; as the rotation speed increases, the vertical strain also increases, and as the rotation speed decreases, the vertical strain also decreases. .
  • This is distortion caused by vertical expansion of the milling tool 100 (and/or tool holder 105) as the milling tool 100 rotates.
  • the circumferential shear strain detected by the strain sensor 130D hardly changes with respect to the rotational speed.
  • centrifugal acceleration detected by the acceleration sensor 120 due to the centrifugal force caused by the rotation of the cutting tool 100, when the rotational speed increases, the centrifugal acceleration also increases, and when the rotational speed decreases, the centrifugal acceleration also decreases.
  • the shear strain i.e., rotational torque
  • the strain sensor 130D it is possible to determine the presence or absence of contact between the milling tool 100 and the workpiece 18 without being affected by the rotation of the milling tool 100, that is, the milling It can be determined whether the tool 100 is being processed.
  • At least one strain sensor for detecting shear strain and at least one acceleration sensor for detecting centrifugal acceleration are arranged. It is necessary.
  • FIG. 5 is a diagram for explaining the state of the milling tool 100 based on the detection signals of each sensor. As explained in FIG. 4, whether or not the milling tool 100 is rotating can be determined using the centrifugal acceleration detected by the acceleration sensor 120. Moreover, the presence or absence of cutting can be determined by using the shear strain detected by the strain sensor 130D.
  • the state of the milling tool 100 can be detected as follows. First, if both the centrifugal acceleration by the acceleration sensor 120 and the shear strain by the strain sensor 130D are detected, it can be determined that the workpiece 18 is actually being cut by the milling tool 100.
  • centrifugal acceleration is detected by the acceleration sensor 120, but if shear strain is not detected by the strain sensor 130D, the milling tool 100 is in a state where it is only rotating with no load (idle state). It can be determined that Furthermore, if neither the centrifugal acceleration by the acceleration sensor 120 nor the shear strain by the strain sensor 130D is detected, it can be determined that the milling tool 100 is stopped.
  • centrifugal acceleration is not detected by the acceleration sensor 120, but shear strain is detected by the strain sensor 130D, this means that the milling tool 100 is in a stopped state and an external force is applied to it, so that the actual is a state that will never occur.
  • a state is, for example, an abnormal state such as when the milling tool 100 is stuck due to an excessive depth of cut, or when the milling tool 100 and the workpiece 18 collide with each other while the tool is stopped, or An abnormality has occurred in the sensor. Therefore, if centrifugal acceleration is not detected and shear strain is detected, it can be determined that an abnormal state has occurred.
  • the state of the milling tool 100 determined using the centrifugal acceleration measured by the acceleration sensor 120 and the shear strain measured by the strain sensor 130D can also be applied to the following processing.
  • strain sensor zero point correction processing As described above, when the shear strain is not detected by the strain sensor 130D, that is, when the milling tool 100 is in "rotation only” or “stopped” with no external force acting on it, the strain No vertical distortion is detected by sensors 130A-130C. However, the values of the strain sensors 130A to 130C are detected due to thermal distortion caused by the ambient temperature or temperature distribution due to cutting fluid, or expansion distortion caused by centrifugal force due to rotation as shown in FIG. In some cases,
  • the offset of the vertical strain data can be removed by performing zero point correction processing on the measured values of the strain sensors 130A to 130C.
  • a malfunction of the milling tool 100 is determined by accumulating continuous measurement data and analyzing the accumulated data, as in Patent Document 1. However, it is difficult to grasp the relationship between changes in sensor data and changes in tool condition using the measured data as is.
  • the range of the data group from the start of machining to the completion of machining for each product can be recognized in advance, for example by a signal indicating a setup change of the workpiece 18, the range of the milling tool determined from the measured data in the data group If the state transition (second data) is different from the state transition pattern (first data) of the milling tool stored in advance for the product, it is determined that the product may have a machining abnormality. It is possible to determine the abnormality and notify the user of the abnormality.
  • FIG. 6 is a flowchart for explaining the state determination process of the milling tool 100, which is executed by the management device 200 in the cutting system 50 of the present embodiment.
  • the processing shown in FIG. 6 is realized by the CPU 220 of the management device 200 executing a program read from the storage device 230.
  • the process shown in FIG. 6 may be executed offline on previously accumulated measurement data, or may be executed online on data measured during actual machining of the workpiece 18. There may be.
  • part or all of the processing described in FIG. 6 may be constructed using hardware such as a semiconductor integrated circuit.
  • the program executed by the CPU 220 can be installed from an external server device or the like.
  • the program may be distributed in a state stored in a storage medium such as a CD-ROM or a semiconductor memory.
  • step (hereinafter abbreviated as "S") 100 management device 200 receives sensor data transmitted from tool holder 105 or sensor data accumulated in storage device 230. get. Then, in S110, the management device 200 determines whether centrifugal acceleration is detected, that is, whether the milling tool 100 is "rotating” based on the measurement data of the acceleration sensor 120. Specifically, the management device 200 determines that the milling tool 100 is “rotating” when the centrifugal acceleration detected by the acceleration sensor 120 is equal to or higher than the first threshold, and the management device 200 determines that the milling tool 100 is “rotating", and controls the centrifugal acceleration detected by the acceleration sensor 120. is less than the first threshold value, it is determined that the milling tool 100 is "stopped”.
  • the process advances to S120.
  • the management device 200 determines whether shear strain is detected, that is, whether an external force acts on the milling tool 100 and torque is generated, based on the measurement data of the strain sensor 130D. Specifically, the management device 200 determines that the milling tool 100 is in contact with the workpiece 18 and torque is generated when the shear strain detected by the strain sensor 130D is equal to or higher than the second threshold; If the detected shear strain is less than the second threshold, it is determined that the milling tool 100 is not in contact with the workpiece 18 and no torque is being generated.
  • the process advances to S130, and the management device 200 determines that the tool status is "Cutting". judge. Then, in S140, the management device 200 adds a label indicating “cutting” to the target data and stores it in the storage device 230.
  • the process proceeds to S135, and the management device 200 determines that the milling tool 100 is "idling" when the milling tool 100 is only rotating. ”. If the process is being executed online, then in S136, the management device 200 may execute a zero point correction process for the strain sensors 130A to 130D that measure vertical distortion. Note that if the process is being executed offline, the process of S136 is skipped. Thereafter, in S140, the management device 200 assigns a label indicating "idle rotation" to the target data and stores it in the storage device 230.
  • the process advances to S170, and the management device 200 uses the measurement data of the strain sensor 130D. Based on this, it is determined whether or not torque is generated in the milling tool 100. If no torque is generated in the milling tool 100 (NO in S170), the process proceeds to S180, and the management device 200 determines that the milling tool 100 is "stopped.” Then, in S140, the management device 200 assigns a label indicating "stopped” to the target data and stores it in the storage device 230.
  • the process proceeds to S185, and the management device 200 controls the milling tool 100. is determined to be in an "abnormal state” and outputs an alarm to the user. Thereafter, in S140, the management device 200 assigns a label indicating "abnormal state" to the target data and stores it in the storage device 230.
  • the process proceeds to S150, where the management device 200 determines whether machining using the milling tool 100 has been completed. If the processing has not been completed (NO in S150), the process returns to S100, and the management device 200 repeatedly executes the processes from S100 to S140 described above. On the other hand, if the processing is completed (YES in S150), the management device 200 ends the state determination process.
  • the management device 200 determines that all sensor data to be processed in the storage device 230 has been processed. Determine whether or not. If data to be processed remains (NO in S150), the process returns to S100. On the other hand, if the processing for all data has been completed (YES in S150), the management device 200 ends the state determination processing.
  • the state of the milling tool attached to the tool holder can be determined based on data from the acceleration sensor and strain sensor attached to the tool holder.
  • FIG. 7 is a diagram showing a modified example of a milling tool 100A.
  • the milling tool 100A does not include a tool holder like the milling tool 100 of Embodiment 1, but has a configuration in which a shaft portion is attached to the main axis of a machine tool that includes the tool holder.
  • the milling tool 100A includes a shaft portion 106A, and an acceleration sensor 120 and a strain sensor 130 attached around the shaft portion 106A.
  • Acceleration sensor 120 and strain sensor 130 are housed inside a housing 170 provided in shaft portion 106A. Acceleration sensor 120 and strain sensor 130 are arranged at equal intervals in the circumferential direction of shaft portion 106A, similarly to milling tool 100 of Embodiment 1.
  • the communication device 140 and battery 150 shown in FIG. 2 are also arranged within the housing 170.
  • a replaceable cutting insert (throw-away tip) 160 is attached to the first end 107 of the shaft portion 106A. Further, the second end portion 108 of the shaft portion 106A is attached to the main shaft 14 of the machine tool 10 having a tool holder.
  • the state of the milling tool can be determined based on the data from the sensor. can be determined.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Machine Tool Sensing Apparatuses (AREA)
  • Milling Processes (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
PCT/JP2022/033386 2022-09-06 2022-09-06 切削システムおよび転削工具の状態判定方法 Ceased WO2024052979A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2023500445A JP7260077B1 (ja) 2022-09-06 2022-09-06 切削システムおよび転削工具の状態判定方法
CN202280099494.6A CN119768249A (zh) 2022-09-06 2022-09-06 切削系统及铣削刀具的状态判定方法
PCT/JP2022/033386 WO2024052979A1 (ja) 2022-09-06 2022-09-06 切削システムおよび転削工具の状態判定方法
EP22958058.4A EP4585366A4 (en) 2022-09-06 2022-09-06 CUTTING SYSTEM AND METHOD FOR DETERMINING THE CONDITION OF A ROTARY TOOL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/033386 WO2024052979A1 (ja) 2022-09-06 2022-09-06 切削システムおよび転削工具の状態判定方法

Publications (1)

Publication Number Publication Date
WO2024052979A1 true WO2024052979A1 (ja) 2024-03-14

Family

ID=86005235

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/033386 Ceased WO2024052979A1 (ja) 2022-09-06 2022-09-06 切削システムおよび転削工具の状態判定方法

Country Status (4)

Country Link
EP (1) EP4585366A4 (https=)
JP (1) JP7260077B1 (https=)
CN (1) CN119768249A (https=)
WO (1) WO2024052979A1 (https=)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW202543782A (zh) * 2024-01-22 2025-11-16 日商Ｎｔｎ股份有限公司 軸承裝置、心軸裝置、負載推定方法、程式、負載感測器之校準方法以及加工負載之計算方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6363821B1 (en) * 2000-06-06 2002-04-02 Pro-Cut Licensing, Llc On-vehicle disk brake lathe
JP2019534795A (ja) * 2016-09-09 2019-12-05 サンドビック インテレクチュアル プロパティー アクティエボラーグ 切れ刃の撓みの推定
JP2019209420A (ja) * 2018-06-04 2019-12-12 株式会社日立製作所 切削加工システム、及び情報処理装置
WO2021029099A1 (ja) 2019-08-09 2021-02-18 住友電気工業株式会社 転削工具、モジュール、切削システム、処理方法および処理プログラム
WO2021049338A1 (ja) * 2019-09-09 2021-03-18 住友電気工業株式会社 切削工具、切削システム、処理方法および処理プログラム
JP7124993B1 (ja) * 2020-12-10 2022-08-24 住友電気工業株式会社 切削工具

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6918738B2 (ja) * 2018-04-09 2021-08-11 株式会社日立製作所 センサシステム

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6363821B1 (en) * 2000-06-06 2002-04-02 Pro-Cut Licensing, Llc On-vehicle disk brake lathe
JP2019534795A (ja) * 2016-09-09 2019-12-05 サンドビック インテレクチュアル プロパティー アクティエボラーグ 切れ刃の撓みの推定
JP2019209420A (ja) * 2018-06-04 2019-12-12 株式会社日立製作所 切削加工システム、及び情報処理装置
WO2021029099A1 (ja) 2019-08-09 2021-02-18 住友電気工業株式会社 転削工具、モジュール、切削システム、処理方法および処理プログラム
JP2021137962A (ja) * 2019-08-09 2021-09-16 住友電気工業株式会社 転削工具、モジュール、切削システム、処理方法および処理プログラム
WO2021049338A1 (ja) * 2019-09-09 2021-03-18 住友電気工業株式会社 切削工具、切削システム、処理方法および処理プログラム
JP7124993B1 (ja) * 2020-12-10 2022-08-24 住友電気工業株式会社 切削工具

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4585366A4

Also Published As

Publication number Publication date
CN119768249A (zh) 2025-04-04
EP4585366A4 (en) 2025-11-19
EP4585366A1 (en) 2025-07-16
JPWO2024052979A1 (https=) 2024-03-14
JP7260077B1 (ja) 2023-04-18

Similar Documents

Publication Publication Date Title
CN109799784B (zh) 刀具磨耗检测装置、其检测方法及刀具磨耗补偿方法
US9186765B2 (en) Monitoring method and monitoring apparatus for machine tool, and machine tool
JP5411055B2 (ja) 工具寿命検出方法、および工具寿命検出装置
US11400556B2 (en) Abnormality detection apparatus for working tools
JP6722052B2 (ja) 多刃工具の異常検知方法
JP2012254499A (ja) 工作機械の加工異常検知装置及び加工異常検知方法
JP7614473B2 (ja) 工作機械の外部処理システム
JP2011020221A (ja) 回転刃具の寿命予測方法
JP4919999B2 (ja) 工具寿命検出方法および工具寿命検出装置
WO2020144939A1 (ja) 診断システム、診断方法、プログラム及び記録媒体
JP7260077B1 (ja) 切削システムおよび転削工具の状態判定方法
JP5089618B2 (ja) 工具寿命検出方法及び工具寿命検出装置
JP7243945B1 (ja) 状態検出システム、方法、およびプログラム
JPH09174383A (ja) 回転工具の異常検出方法および装置
JP7458065B2 (ja) 機械要素間の接触状態モニタ方法及びそのシステム
CN110091214A (zh) 用于监控数控机床工作主轴的工具夹紧系统的方法和装置
JP7796301B1 (ja) 管理装置、管理装置の制御方法およびそれに用いられるプログラム、ならびに切削システム
CN110370079A (zh) 一种铣刀磨损测量方法
JPH06320396A (ja) 刃工具の寿命判定方法および自動交換方法
WO2026094166A1 (ja) 管理装置、管理装置の制御方法およびそれに用いられるプログラム、ならびに切削システム
JP2016040071A (ja) 工具異常検知方法
JP7768448B1 (ja) 表示装置、集約装置、表示方法、システムおよびコンピュータプログラム
JP7756837B1 (ja) 診断システム、診断方法、および診断プログラム
JP7576594B2 (ja) 切削システム及び切削方法
Ahmed An online approach for power consumption monitoring of tool condition

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2023500445

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22958058

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202280099494.6

Country of ref document: CN

WWP Wipo information: published in national office

Ref document number: 202280099494.6

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2022958058

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2022958058

Country of ref document: EP

Effective date: 20250407

WWP Wipo information: published in national office

Ref document number: 2022958058

Country of ref document: EP