WO2020090844A1 - 工具形状測定装置および工具形状測定方法 - Google Patents

工具形状測定装置および工具形状測定方法 Download PDF

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Publication number
WO2020090844A1
WO2020090844A1 PCT/JP2019/042460 JP2019042460W WO2020090844A1 WO 2020090844 A1 WO2020090844 A1 WO 2020090844A1 JP 2019042460 W JP2019042460 W JP 2019042460W WO 2020090844 A1 WO2020090844 A1 WO 2020090844A1
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WIPO (PCT)
Prior art keywords
tool
spindle
shape measuring
rotation angle
camera
Prior art date
Application number
PCT/JP2019/042460
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English (en)
French (fr)
Japanese (ja)
Inventor
勇 室伏
Original Assignee
東芝機械株式会社
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 東芝機械株式会社 filed Critical 東芝機械株式会社
Priority to JP2020553953A priority Critical patent/JP7132349B2/ja
Priority to KR1020217016306A priority patent/KR102579691B1/ko
Priority to CN201980070989.4A priority patent/CN112969900B/zh
Publication of WO2020090844A1 publication Critical patent/WO2020090844A1/ja

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • 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
    • B23Q17/24—Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/022—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by means of tv-camera scanning
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
    • H04N23/661—Transmitting camera control signals through networks, e.g. control via the Internet

Definitions

  • the present invention relates to a tool shape measuring device and a tool shape measuring method for measuring a tool shape such as a tool length, a tool diameter, and a shape of a tool blade.
  • the tool shape measuring device is used, for example, in measuring the shape of an end mill of a milling machine.
  • Patent Document 1 can measure the shape of the tool, but does not describe the rotating tool.
  • the machining point of the rotating tool changes due to thermal displacement. I want to accurately measure the position of a machining point during rotation to correct thermal displacement. Further, if the tool shape can be measured even during rotation at the rotation speed used for machining, it can be used for tool replacement and tool wear correction by observing the state of chipping or wear.
  • the present invention has been made in consideration of such circumstances, and provides a tool shape measuring device and a tool shape measuring method capable of measuring the shape of a tool even during rotation.
  • the present invention has the following features.
  • the present invention it is possible to read the rotation angle of the main shaft for attaching and rotating the tool from the angle sensor and photograph the shape of the tool at the specified angle.
  • a tool shape measuring device is a tool shape measuring device that measures the shape of a tool installed on a spindle of a machine tool, and a camera for photographing the tool and a rotation angle of the spindle. It has a spindle rotation angle sensor for detecting, and a control device for outputting a photographing command to the camera according to the rotation angle of the spindle detected by the spindle rotation angle sensor.
  • the spindle rotation angle sensor is configured to also detect the rotation speed of the spindle, and the control device outputs a shooting command to the camera. Is changed according to the number of rotations of the main shaft.
  • a tool shape measuring device includes a light emitting device, and is configured such that the light emitting device emits light toward the tool according to an output of a photographing command to the camera by the control device. There is.
  • the tool shape measuring device is configured such that the light emitting device emits light within the time when the shutter of the camera is opened by the output of the photographing command to the camera by the control device. ing.
  • the camera is installed on one side and the light emitting device is installed on the other side with the tool in between, and the light emitting device is the tool.
  • the tool is configured to shoot an image of the tool by emitting light toward the tool, and the light emitting device is configured to emit parallel light toward the tool.
  • the spindle rotation angle sensor outputs a continuous pulse signal when the spindle is rotating, and a pulse of one cycle is generated for each rotation of the spindle. It is configured to emit a signal.
  • a first output as an output of the imaging command by the control device, and a plurality of main shafts are rotated by a predetermined angle by the first output. Is configured to obtain an image of.
  • the tool shape measuring device there is further a second output as an output of the photographing command by the control device, and a tool rotation angle input unit for inputting a rotation angle of the tool is provided, and the control is performed.
  • the device is configured to output the second output in order to capture an image of the tool at the rotation angle input by the tool rotation angle input unit.
  • a tool shape measuring method is a tool shape measuring method for measuring a shape of a tool installed on a spindle of a machine tool, and a spindle rotation angle detecting step of detecting a rotation angle of the spindle. And a photographing step of photographing the tool according to the rotation angle of the spindle detected in the spindle rotation angle detection step.
  • the spindle rotation angle detecting step is a step of detecting the rotation number of the spindle, and in the photographing step, the timing of the photographing is set to the rotation number of the spindle. It changes according to.
  • the light emitting device in the photographing step, emits light toward the tool during the photographing.
  • the light emitting device in the photographing step, emits light within the time when the shutter of the camera is open.
  • a camera for taking an image in the imaging step is installed on one side with the tool in between, and the light emitting device is installed on the other side.
  • the light emitting device emits light toward the tool, so that the camera captures an image of the tool in the capturing step, and the light emitting device emits parallel light toward the tool. ing.
  • a continuous pulse signal is output while the spindle is rotating, and one cycle is generated for each rotation of the spindle.
  • the pulse signal is output.
  • the first step captures a plurality of images in a state in which the spindle is rotated by a predetermined angle. It is a process.
  • the photographing step further includes a second step, and the second step includes a predetermined rotation angle after the photographing in the first step. This is a step of photographing only the image of the tool which is set to.
  • the shape of a rotating tool can be measured, and the shape of the tool including thermal displacement during machining can be measured more accurately. If the machining point of the tool is corrected based on the measured shape of the tool, more accurate machining becomes possible.
  • FIG. 1 is a schematic diagram showing a device configuration (device according to the first embodiment) of an example of the present invention.
  • FIG. 2 is a diagram when the tool shape is measured in the example of the present invention (the apparatus according to the first embodiment).
  • FIG. 3 is a cross-sectional view of a two-blade tool as an example of a tool measured by the tool shape measuring device according to the first embodiment of the present invention.
  • FIG. 4 is a transverse cross-sectional view of a three-blade tool as another example of the tool measured by the tool shape measuring device according to the first embodiment of the present invention.
  • FIG. 5A is a diagram showing a schematic configuration of a spindle head of a machine tool used in the second embodiment of the present invention, and FIG.
  • FIG. 5B is a schematic VB arrow view in FIG. 5A.
  • FIG. 5C is a diagram showing a continuous pulse signal obtained by the spindle rotation angle sensor.
  • FIG. 6 is a view showing a tool (rotating tool) measured by the tool shape measuring apparatus according to the second embodiment of the present invention, in which the tool, the camera, and the light emitting device are arranged on the rotation center axis of the tool. It is the figure seen in the extending direction.
  • FIG. 7 is a diagram for explaining the positional relationship between the light emitting device, the tool, and the camera in the tool shape measuring device according to the second embodiment of the present invention. It is the figure seen in the extending direction.
  • FIG. 6 is a view showing a tool (rotating tool) measured by the tool shape measuring apparatus according to the second embodiment of the present invention, in which the tool, the camera, and the light emitting device are arranged on the rotation center axis of the tool. It is the figure seen in the extending direction.
  • FIG. 7 is
  • FIG. 8A is an image of the tool obtained by the tool shape measuring device according to the comparative example, and FIG. 8B is obtained by the tool shape measuring device according to the second embodiment of the present invention. It is an image of a tool.
  • 9A is a diagram showing a ball end mill which is an example of a tool
  • FIG. 9B is a diagram showing a square end mill which is an example of a tool
  • FIG. 9C is an example of a tool.
  • FIG.9 (d) is a figure which shows the shape error in a ball end mill.
  • FIG. 10A and FIG. 10B are views for explaining the photographing time lag in the tool shape measuring device according to the second embodiment of the present invention.
  • FIG. 11A is a diagram showing a cylindrical dummy tool used in the tool shape measuring device according to the second embodiment of the present invention
  • FIG. 11B is a side view of the cylindrical dummy tool.
  • the machine tool 2 shown in FIG. 1 has a table 16 and a gate-shaped column 10 on the upper surface of a bed 18, and a spindle head 4 is supported on a cross rail 8 of the column 10 via a saddle 6. A spindle 11 is supported on the spindle head 4.
  • a predetermined horizontal direction is defined as the X direction (X axis direction)
  • another predetermined horizontal direction orthogonal to the X direction is defined as the Y direction (Y axis direction).
  • the vertical direction orthogonal to the X and Y directions is the Z direction (Z axis direction).
  • the table 16 is movable in the X-axis direction with respect to the bed 18.
  • the saddle 6 is movable in the Y-axis direction along the cross rail 8.
  • the spindle head 4 is movable in the Z axis direction with respect to the saddle 6. By moving these three axes, it is possible to move the tool 12 in three dimensions with respect to the work 14 placed on the table 16 for machining.
  • the tool shape measuring device 1 is installed at the end of the table 16.
  • the control device 20 is connected to the machine tool 2 and the tool shape measuring device 1, and can control the machine tool 2 and the tool shape measuring device 1.
  • FIG. 2 shows a diagram in which the tool shape measuring device 1 measures the shape of the tool 12.
  • the tool 12 is moved to the position shown in FIG. 2 by the three axes shown above, and the tool shape is measured.
  • the tool shape measuring device 1 includes a camera 22 and an illuminating device 24. As shown in FIG. 2, the tool 12 measures the tool shape while being positioned between the camera 22 and the illuminating device 24. Since an image is captured by shining light from the illumination device 24 from behind the tool 12, the shape of the tool 12 is captured as a shadow.
  • the camera 22 is equipped with a high-speed shutter, and it is possible to shoot still images while the tool 12 is rotating at several thousand rotations / minute. Further, a zoom lens may be attached to the camera 22 so that the control device 20 can control the enlargement ratio.
  • the main shaft 11 is provided with a rotation angle sensor (not shown), and the control device 20 can control the rotation speed, the rotation angle, and the like.
  • the lighting device 24 has a strobe function. If a strobe with a short light emission time of several ⁇ sec is used, it is possible to measure the shape even with the rotating tool 12.
  • the maximum rotation speed of the tool 12 can be set to about 120,000 rotations / minute.
  • FIG. 3 shows an example of the tool 12A used and shows a two-flute end mill.
  • work 14 side in the state attached to the machine tool 2 is shown.
  • FIG. 4 shows an example of the tool 12B used, and shows a three-blade end mill.
  • work 14 side in the state attached to the machine tool 2 is shown.
  • the tool reference angle indicates the angle at which the camera 22 can photograph the tool 12A from the direction indicated by the arrow 26A in FIG.
  • the angle indicated by the arrow 26A has the maximum distance from the position of the spindle rotation axis to the outer shape of the tool 12A in the direction orthogonal to the spindle rotation axis. The distance is measured by counting the number of pixels of the digital image, for example.
  • the tool reference angle is determined as follows.
  • the position of the arrow 26A indicates the direction of the camera 22 for photographing, but the spindle 11 is manually rotated so that the position close to the angle of the tool 12A capable of photographing from this position.
  • the image captured by the camera 22 can be confirmed on a monitor (not shown).
  • the tool 22A is rotated in the forward rotation direction and the reverse rotation direction by a predetermined angle, and at that time, a plurality of images are taken by the camera 22 at constant angles.
  • the angle of the spindle 11 at the position where the distance from the image to the outer shape of the tool 12A from the rotation axis of the spindle 11 is the tool reference angle.
  • the tool reference angle can be determined as follows. Since the tool 12A is a double-edged blade, the tool 12A is rotated at a low speed of 180 ° or more from an arbitrary position, and an image is captured at each predetermined angle. The angle of the spindle 11 at the position where the distance from the captured image to the outer shape of the tool 12A from the rotation axis of the spindle 11 is the longest is the tool reference angle.
  • the tool 12B shown in FIG. 4 has three blades, it suffices to rotate the main shaft 11 by 120 ° or more for shooting.
  • the position of the arrow 26B shown in FIG. For a tool that is not rotationally symmetric, the number of captured images is large, but the tool 12 is photographed each time the spindle 11 is rotated once, for example, every 1 °, and among the 360 images obtained by this photography. Select the required image from.
  • the information that the tool 12 to be used is a 2-flute or 3-flute may be input to the control device 20 by an input device (not shown), or may be stored as a database in a storage device in the control device 20. Good.
  • the machine tool 2 stops machining and moves the tool 12 to the tool length measuring position shown in FIG.
  • the tool 12 is moved and measured by the tool shape measuring device 1 without stopping the rotation of the spindle 11 and maintaining the rotation speed during processing. Therefore, an accurate tool shape can be measured while being affected by centrifugal force during rotation, and if the measured value is used for thermal displacement correction and tool wear correction, it can be corrected in a state closer to the tool 12 being machined. Can be processed with high precision.
  • a measurement command is output from the control device 20 to the tool shape measuring device 1 when the spindle 11 reaches the previously determined tool reference angle, and a tool shape image is captured. ..
  • the shapes of all the blades can be photographed by photographing the tool reference angle and the tool reference angle + 180 °. Since the tool 12B has three blades, all the shapes of the blades can be photographed by photographing at the tool reference angle, the tool reference angle + 120 °, and the tool reference angle + 240 °.
  • the shooting may be one blade rotation or multiple rotations. Even in the case of a multi-blade tool, it is possible to manage all the blades by photographing the shape of each blade one by one.
  • the controller 20 issues a shooting command after the tool reference angle and the angle of the spindle 11 match, the actual shooting timing may be delayed if the spindle 11 rotates at high speed.
  • the control device may output the photographing command shortly before the tool reference angle and the angle sensor of the spindle 11 match.
  • the angle at which the command should be output should be measured in advance by experiments. It is also possible to carry out an experiment at a plurality of rotation speeds, obtain this angle and make a table, and obtain an appropriate angle from this table according to the rotation speed.
  • an illumination device 24 having a flash function (strobe function) is used, and the value of the spindle 11 rotation sensor and the value of the photographing angle of the tool 12 are calculated as follows. To correspond. The tool 12 is rotated, and when the value of a certain rotation sensor is reached, a shooting command is output from the control device 20 to the tool shape measuring device 1 to shoot an image.
  • a flash function strobe function
  • the predetermined angle is, for example, 5 °.
  • the shutter speed of the camera 22 cannot catch up, and it is impossible to capture an image shifted by 5 ° during one rotation of the tool 12. For this reason, an image of an angle rotated by 10 ° and 5 ° from the previous image is captured.
  • the lighting device 24 can set the time to delay the timing of emitting light in response to a command in ⁇ sec unit. Therefore, it is possible to accurately capture an image such as 10 rotations and a deviation of 5 °. Such images are taken by a predetermined rotation angle of the tool 12, and the values of the spindle 11 rotation sensor and the imaging angle values of the tool 12 are associated from these images.
  • the delay time when the lighting device 24 emits light is appropriately set, and the shooting command is measured from the control device 20 at an appropriate timing.
  • an image of the desired degree of angular rotation of the tool 12 can be taken.
  • a correction value is determined from that value and set in the control device 20 as the correction value. If the distance from the rotation axis of the spindle 11 to the outer shape of the tool 12 is remarkably fluctuated by the blade and is rotating, it is determined that the tool 12 has a large amount of rotational runout, and an alarm is displayed on the monitor of the control device 20. Good. Although there is no significant change depending on the blade, if only one blade has a short distance, it may be determined that the blade is missing and an alarm may be generated.
  • the spindle 11 can be rotated at the number of revolutions during machining to measure the shape of the tool 12 in the same state as during machining. Can be measured. Further, since the image can be taken in synchronization with the value of the rotation angle sensor of the spindle 11, only the image of the required rotation angle state of the tool 12 can be taken, and the capacity of the recording device can be reduced.
  • a machine tool 2 (see FIG. 1) used in the second embodiment of the present invention is the same as the machine tool 2 used in the first embodiment of the present invention, and includes a spindle head 4 and a controller 20. And so on.
  • the control device 20 is configured to include a CPU and a memory (not shown).
  • the tool shape measuring apparatus 1a according to the second embodiment of the present invention is also configured to be substantially the same as the tool shape measuring apparatus 1 according to the first embodiment of the present invention, and operates and is used in substantially the same manner. Is.
  • the tool 12 which is the measurement target of the tool shape measuring apparatus 1 or 1a according to the embodiment of the present invention, is used, for example, when forming the surface of the core or cavity of a mold by cutting.
  • the cutting process is carried out, for example, for final finishing of the surfaces of the core and the cavity of the mold, and the cutting process makes the surfaces of the core and the cavity of the mold look like mirror surfaces.
  • the tool 12 may be an end mill, for example.
  • the outer diameter of the end mill 12 is, for example, about 1 mm, and the rotation speed of the end mill 12 when cutting is about 60,000 rotations / minute.
  • the spindle head 4 is of a built-in motor type, and is configured to include a housing 31 and a spindle (spindle) 11.
  • the main shaft 11 is formed in a cylindrical shape, and is rotatably supported by the housing 31 by an air bearing.
  • Reference numeral C1 indicates the center axis of rotation of the main shaft 11.
  • a tool holding portion 33 is provided at one end portion (lower end portion in FIG. 5A) in the longitudinal direction of the main shaft 11 (extending direction of the rotation center axis C1; Z direction). Since the tool holding portion 33 is provided, the tool 12 can be attached to and detached from the spindle 11.
  • a rotor 37 of the motor 35 is integrally provided at the other end portion (upper end portion in FIG. 5A) in the longitudinal direction of the main shaft 11.
  • a stator 39 of the motor 35 is provided outside the rotor 37. The stator 39 is integrally provided in the housing 31 at a slight distance from the rotor 37.
  • the tool shape measuring device 1a is a device for measuring the shape of the tool 12 installed on the spindle 11 of the machine tool 2 in the same manner as the tool shape measuring device 1 according to the first embodiment of the present invention. As shown by, the camera 22 and the spindle rotation angle sensor (spindle rotation angle detection sensor) 41 and the control device 20 (see FIG. 1) are provided.
  • the camera 22 takes an image of the rotating tool 12 and obtains an image (still image) of the tool 12.
  • the camera 22 is, for example, a digital camera, and is adapted to capture an image of the tool 12 with a global shutter.
  • the shutter speed of the camera 22 (exposure time of the image sensor 75 of the camera 22 shown in FIG. 7) when photographing the tool 12 is such a short time that the image of the rotating tool 12 becomes a substantially still image. There is.
  • the spindle rotation angle sensor 41 detects the rotation angle of the spindle 11 (the tool 12 installed on the spindle 11). Further, the main spindle rotation angle sensor 41 outputs a continuous pulse signal (see FIG. 5C and FIG. 10) while the main spindle 11 is rotating, and a pulse of one cycle every one rotation of the main spindle 11. It is configured to emit a signal. Since the main shaft 11 rotates at a constant speed, the cycle of the continuous pulse signal has a constant value.
  • the spindle rotation angle sensor 41 will be described in more detail with reference to FIGS.
  • the spindle rotation angle sensor 41 includes, for example, a reflective photoelectric sensor 43 and a mark 45.
  • the photoelectric sensor 43 is provided integrally with the housing 31.
  • the mark 45 is integrally provided on the main shaft 11 over, for example, this half circumference (see the portion with the broken line in FIG. 5B). Then, when the main shaft 11 rotates, the photoelectric sensor 43 repeats the state in which the mark 45 is detected and the state in which it is not detected, and the photoelectric sensor 43 emits a continuous pulse signal as shown in FIG. 5C. Is becoming
  • the resolution of the rotation angle of the spindle 11 by the spindle rotation angle sensor 41 is extremely large, 180 °.
  • the controller 20 outputs a shooting command to the camera 22 according to the rotation angle of the spindle 11 detected by the spindle rotation angle sensor 41. For example, when the spindle rotation angle sensor 41 detects the mark 45, a shooting command is output.
  • the tool 12 is installed at a predetermined rotation angle with respect to the spindle 11. For example, when viewed in the extending direction (Z direction) of the rotation center axis C1, the angle (phase) of the end of the mark 45 (the end on the front side in the rotation direction of the main shaft 11) and the tip 47 of the cutting edge of the tool 12 (see FIG. 3). , FIG. 4 and FIG. 6).
  • the tip 47 of one cutting edge of the two-blade tool 12 is formed linearly, but is located on one plane, and the tip 47 of the other cutting edge of the two-blade tool 12 is also It is assumed to be located on the one plane.
  • the tip 47 of the cutting edge of the tool 12 formed in a linear shape does not need to be located exactly on one plane, and may be located on almost one plane.
  • the tip 47 of one cutting edge of the tool 12 may be located inside the sector with a central angle of about 1 ° to 5 °.
  • the rotation center axis C1 when viewed in the extending direction (Z direction) of the rotation center axis C1, the rotation center axis C1, the end of the mark 45, and the tip 47 of the cutting edge of the tool 12 exist on one straight line.
  • the tool 12 has a plurality of cutting edge tips 47 (two or three), but one tip 47 of the plurality of cutting edge tips 47, the rotation center axis C1, and the end of the mark 45 are one. It suffices if it exists on the straight line of.
  • the mark 45 may be provided at a portion other than the cutting edge of the tool 12 instead of the spindle 11, and the photoelectric sensor 43 may detect the mark 45 provided on the tool 12. Accordingly, when the tool 12 is installed on the spindle 11, it is not necessary to care about the installation angle of the tool 12, and the tool 12 can be easily installed on the spindle 11.
  • the rotation angle of the tool 12 installed on the spindle 11 may be detected by detecting the tip 47 of the cutting edge of the tool with a sensor such as a photoelectric sensor 43 or a proximity sensor without providing a mark. Good.
  • a sensor such as a photoelectric sensor 43 or a proximity sensor without providing a mark. Good.
  • the end mill 12 has two blades, a pulse signal of two cycles is issued every one rotation of the spindle 11, and if the end mill 12 has three blades, the spindle 11 makes one rotation. A pulse signal of 3 cycles is issued every time.
  • the control device 20 issues a command (imaging) that the rotating tool 12 should be imaged in accordance with the values of the rotation angles of the spindle 11 and the tool 12 detected by the spindle rotation angle sensor 41.
  • (Command; shooting command signal) is sent to the camera 22.
  • the camera 22, which has received the shooting command immediately shoots the rotating tool 12 and obtains a still image of the tool 12. Then, a still image of the maximum outer shape of the tool 12 at the tip 47 of the cutting edge of the rotating tool 12 is obtained.
  • the rotation angle of the spindle 11 and the tool 12 that can obtain a still image of this maximum outer shape is the maximum rotation angle.
  • the maximum rotation angle corresponds to the tool reference angle described in the first embodiment.
  • the ball end mill 12 will be described. As shown in FIG. 9A, the ball end mill 12 is provided with cutting edges (portions indicated by broken lines) on the outer circumference. It should be noted that in FIG. 9, the shape of the end mill 12 is drawn in a simplified manner, and therefore the display of cutting edges and grooves is omitted.
  • the ball end mill 12 is configured to include a cylindrical base end portion 49 and a hemispherical tip end portion 51 as shown in FIG. 9A.
  • the outer diameter of the proximal end portion 49 and the diameter of the distal end portion 51 match each other, and the distal end portion 51 is located at one end (lower end) in the extending direction (Z direction) of the central axis C1 of the proximal end portion 49. It has a sticky shape.
  • the center of the circular end surface of the hemispherical tip portion 51 is the center C2 of the tip portion 51
  • the center C2 is the ball. It exists on the central axis C1 of the end mill 12.
  • the cutting edge of the ball end mill 12 is formed on the outer periphery of the tip portion 51 and the end portion of the base end portion 49 (end portion on the tip end 51 side).
  • the ball end mill 12 is configured such that the other end portion of the base end portion 49 is engaged with the tool holding portion 33 and held by the tool holding portion 33.
  • the ball end mill 12 held by the tool holding portion 33 of the spindle 11 rotates with the spindle 11 (rotates around the central axis C1 as a rotation center) to cut the workpiece (workpiece) 14 with a cutting edge. It is designed to be processed.
  • the ball end mill 12 moves in the X direction, Y direction, and Z direction with respect to the workpiece 14. ing.
  • the point at which the ball end mill 12 is in contact with the workpiece 14 at the rearmost end in this moving direction is the processing point. become.
  • the processing point is formed at a part of the tip 47 of the cutting edge of the ball end mill 12.
  • the position of the cutting edge of the ball end mill 12 changes with the passage of time due to the rotation. For example, in the case of the two-blade ball end mill 12, one of the two cutting edges makes one revolution every time the ball end mill 12 makes one revolution.
  • a pair of cutting edges are formed so as to be point-symmetric with respect to the rotation center axis C1 (FIGS. 3 and 6). , See FIG. 7).
  • the distance between the tip 47 of the cutting edge and the rotation center axis C1 (for example, The distance in the X direction) changes.
  • the reference numeral La of FIG. 6A, the reference numeral Lb of FIG. 6B, the reference numeral Lc of FIG. 6C, and the reference numeral Ld of FIG. The distance in the direction.
  • the tool 12 is rotating counterclockwise as shown by the arrow in FIG. 6, and with time, the state shown in FIG. 6A, the state shown in FIG. The state shown in FIG. 6C, the state shown in FIG. 6D, the state shown in FIG.
  • the value of the distance between the tip 47 of one of the cutting edges of the ball end mill 12 and the rotation center axis C1 becomes maximum.
  • the values are Lb and Ld.
  • the still image of the ball end mill 12 at the maximum values Lb and Ld becomes the still image of the maximum outer shape of the ball end mill 12 at the tip 47 of one cutting edge of the rotating ball end mill 12.
  • the value of the distance between is the maximum value.
  • the still image of the ball end mill 12 when it reaches this maximum value is a still image of the maximum outer shape of the ball end mill 12 at the tip of the other cutting edge of the rotating ball end mill 12.
  • the outer shape (outer periphery; linear edge) of the cutting edge of the ball end mill 12 obtained by still images of these maximum outer shapes shows the tip 47 of the cutting edge of the ball end mill 12.
  • the tip 47 (47A) of one cutting edge and the tip 47 (47B) of the other cutting edge are slightly smaller than the rotation center axis C1. ) And are often asymmetric.
  • the still image of the maximum outer shape of the ball end mill 12 at the tip 47 of the cutting edge the one having the larger value of the distance from the rotation center axis C1 of the tip 47 of the pair of cutting edges is adopted. ..
  • the two-dot chain line in FIG. 9 (d) shows the tip 47A of one cutting edge arranged symmetrically with respect to the rotation center axis C1.
  • all the tips 47B of the other cutting edge are located inside the tip 47A of the one cutting edge, but a part of the tip 47B of the other cutting edge is It may be located outside the tip 47A.
  • the still image of the maximum outer shape of the ball end mill 12 at the tip 47 of the cutting edge is formed by a part of the tip 47A of one cutting edge and a part of the tip 47B of the other cutting edge.
  • the spindle rotation angle sensor 41 is also configured to detect the rotation speed (rotational angular velocity) of the spindle 11. As described above, the main shaft rotation angle sensor 41 is configured to emit a continuous pulse signal of, for example, a rectangular wave by the main shaft 11 rotating at a constant rotation speed.
  • the control device 20 receives the continuous pulse signal emitted from the spindle rotation angle sensor 41, and measures the time interval (the cycle of the continuous pulse signal) of the continuous pulse signal that is turned on / off per predetermined time. The number of rotations of the main shaft 11 is detected.
  • the spindle rotation angle sensor 41 is configured to detect the rotation speed of the spindle 11 by measuring the time interval of the continuous pulse signal in which the spindle rotation angle sensor 41 is turned on / off instead of the control device 20. May be.
  • the control device 20 changes the timing of outputting a shooting command to the camera 22 according to the rotation speed (rotational angular velocity) of the spindle 11.
  • the change (adjustment) in the timing of outputting the shooting command to the camera 22 by the control device 20 is performed in order to obtain a still image of the maximum outer shape of the tool 12 at the tip 47 of the cutting edge of the rotating tool 12. That is, it is performed to obtain a still image of the tool 12 having the maximum rotation angle.
  • shooting time lag delay time
  • delay time a slight delay from when the control device 20 outputs a shooting command to the camera 22 until the camera 22 actually shoots. For example, even if the control device 20 outputs a shooting command to the camera 22 when the tool 12 reaches a rotation angle at which a still image of the maximum outer shape of the tool 12 at the tip 47 of the cutting edge of the tool 12 can be obtained, In addition, it takes a short time until the camera 22 photographs the tool 12. The tool 12 slightly rotates during this short time, and it becomes impossible to obtain a still image of the maximum outer shape of the tool 12 at the tip 47 of the cutting edge of the tool 12.
  • FIG. 6 is a view of the two-blade tool 12 viewed in the Z direction.
  • the tool 12 is assumed to rotate 60,000 times in one minute in the direction indicated by the arrow. As described above, the time has passed from FIG. 6A to FIG. 6D.
  • State 1 shown in FIG. 6A shows a case where the delay is “0 ⁇ sec”
  • State 2 shown in FIG. 6B shows a case where the delay is “250 ⁇ sec”.
  • State 3 shown in (c) shows a case where the delay is "500 ⁇ sec”
  • state 4 shown in FIG. 6D shows a case where the delay is "750 ⁇ sec”.
  • the tool 12 having the rotation angle of the state 2 is shot.
  • FIG. 6 indicates a light emitting device 61 described later. Further, as described above, a still image of the maximum outer shape of the tool 12 can be obtained by photographing in the states 2 and 4 of FIGS. 6B and 6D.
  • the timing of outputting the shooting command to the camera 22 is adjusted using the shooting time lag (the shooting time lag time stored in the memory of the control device 20) that is obtained in advance. For example, a shooting command is output to the camera 22 at a time point that is a shooting time lag back from the time when the rotation angle at which the maximum outer shape of the tool 12 at the tip 47 of the cutting edge of the tool 12 can be obtained is reached. It has become.
  • the horizontal axis of FIG. 10 shows the passage of time t, and the vertical axis shows the ON / OFF state of the continuous pulse signal generated by the spindle rotation angle sensor 41.
  • the spindle 11 and the tool 12 are at the maximum rotation angle at time t1.
  • the spindle rotation angle sensor 41 starts emitting an ON signal at time t1, the ON signal stops at time t2, the spindle rotation angle sensor 41 starts emitting an ON signal at time t3, and the ON signal stops at time t4. It is like this.
  • the reference numeral TF shown in FIG. 10A is the time indicating one cycle in the continuous pulse signal.
  • Reference numeral TD in FIG. 10A indicates the time of the shooting time lag.
  • control device 20 when the control device 20 outputs a shooting command to the camera 22 at time td1 which is a time TD back from time t1, the time at which the camera 22 shoots the tool 12 becomes time t1, and a still image of the maximum outer shape of the tool 12 is obtained. Can be obtained.
  • control device 20 outputs a shooting command to the camera 22 at time td2, which is a time (TF-TD) that has elapsed from time t1, the time at which the camera 22 shoots the tool 12 becomes time t3. It is possible to obtain a still image of the maximum outer shape of the tool 12.
  • the time TD of the imaging time lag is shorter than the time TF indicating one cycle in the continuous pulse signal, but the time TD may be longer than the time TF.
  • the control device 20 outputs a shooting command to the camera 22 at time td2, which is a time (2 ⁇ TF-TD) elapsed after time t1.
  • time td2 is a time (2 ⁇ TF-TD) elapsed after time t1.
  • time t5 is a time at which the camera 22 captures the tool 12.
  • control device 20 may output a shooting command to the camera 22 at a time (not shown in FIG. 10B) that is traced back by time TD from time t1. Good. In this case, the time when the camera 22 photographs the tool 12 is time t3.
  • TF-TD and “2 ⁇ TF-TD” may be replaced with “n ⁇ TF-TD”.
  • n is an arbitrary natural number.
  • the control device 20 outputs a shooting command to the camera 22, and the camera 22 obtains a still image of the dummy tool in which the dummy tool is photographed.
  • the spindle rotation angle sensor 41 detects that the rotation angle of the mark of the dummy tool has become “0 °”, and the control device 20 causes the camera 22 to rotate.
  • a still image of the dummy tool is obtained by outputting a shooting command to the camera 22 and shooting the dummy tool by the camera 22. If the rotation angle of the mark shown in the obtained still image is "45 °", the time TD of the photographing time lag is 125 ⁇ sec, and if the rotation angle is "90 °". The time TD of the photographing time lag is 250 ⁇ sec.
  • time lag time TDa time lag time TDa ⁇ constant rotation speed nb / constant rotation speed na”.
  • the time lag time TDb when the spindle 11 is rotating at another constant rotation speed nb may be set as follows. However, na1 ⁇ na2 ⁇ na3 ... And TDa1> TDa2> TDa3.
  • the time lag time at this matching rotation speed is adopted as the time lag time TDb.
  • the spindle 11 may rotate 360 ° or more within the time lag TD.
  • the main spindle 11 is first rotated at a low rotational speed to find the time lag time TD, and then the rotational speed of the main spindle 11 is gradually increased to find the time lag time TD, the main spindle 11 is within the time lag time TD. Can be detected to have rotated by 360 ° or more.
  • the dummy tool shown in FIG. 11 may be adopted.
  • the dummy tool 63 shown in FIG. 11 is provided with a plurality of marks 67 (67A, 67B, 67C, 67D ”) On the side surface of a cylindrical dummy tool body 65.
  • the marks 67 are arranged at regular intervals in the circumferential direction of the cylindrical dummy tool main body 65 (the left-right direction in FIG. 11B).
  • the respective marks 67 (67A, 67B, 67C, 67D ...) Are arranged at regular intervals in the height direction of the cylindrical dummy tool body 65 (vertical direction in FIG. 11B). At the same time, the distance from the lower end in the Z direction gradually increases from the left to the right in FIG.
  • the spindle rotation angle sensor 41 emits a pulse signal for one cycle every time the spindle 11 makes one rotation, but instead of or in addition to the spindle rotation angle sensor 41, a rotary encoder (Fig. (Not shown) may be provided to detect the rotation angle of the spindle 11.
  • the resolution of the rotary encoder is sufficiently smaller than the resolution of the spindle rotation angle sensor 41, and is, for example, about 1 ° or about 0.1 ° to 5 °, or less.
  • the time lag caused by the control device 20 or the time lag caused by the control device 20 may be added to the time lag from when the control device 20 outputs the shooting command to the camera 22 to when the camera 22 shoots.
  • the first output and the second output may be listed as the output of the shooting command by the control device 20.
  • the first output is for obtaining a plurality of images (still images of a plurality of tools 12) in a state in which the spindle 11 is rotated by a predetermined angle (for example, 1 °).
  • the still images of the plurality of tools 12 are images corresponding to one rotation of the spindle 11.
  • the first image capturing (image capturing of the first group) is performed, and for example, 360 images for one rotation of the tool 12 can be captured by the camera 22.
  • the rotation angle of the spindle 11 that has a predetermined rotation angle is the reference angle (0 °)
  • an image of the tool 12 when rotated by 1 ° from the reference angle a tool when rotated by 2 ° from the reference angle 12 images
  • an image of the tool 12 when rotated from the reference angle by 3 °, and the like so that an image can be obtained on 360 sheets for one revolution of the tool 12.
  • the above-mentioned angle of 1 ° is an angle within which the error of the photographed image (the image obtained by photographing with the camera 22) with respect to the actual shape of the tool 12 falls within the allowable range.
  • the first image is an image in which the main axis 11 is rotated by 360 ° ⁇ m 1 + 1 ° from the reference angle.
  • the second image is an image in which the main shaft 11 is rotated 360 ° ⁇ m 2 + 2 ° from the reference angle.
  • the p-th image is an image in which the main shaft 11 is rotated by 360 ° ⁇ m p + p ° from the reference angle.
  • m 1, m 2 ⁇ m p ⁇ , p is a natural number, which is m 1 ⁇ m 2 ⁇ m p ⁇ .
  • m 1 ⁇ m 2 ⁇ ... m p ... 2 ° is photographed after 1 ° is photographed. That is, in the above description, the images are taken in order from the state where the rotation angle of the tool 12 from the reference angle is small. However, this does not necessarily have to be the case.
  • the images may be taken in a shooting order irrespective of the size of the rotation angle of the tool 12 from the reference angle. For example, shooting may be performed at 10 ° after shooting at 350 °, and shooting at 121 ° may be performed after shooting at 10 °.
  • the tool 12 in the state of being rotated by 360 ° ⁇ m 0 + 1 ° from the time when the first photographing signal is output is photographed to obtain the image of the first tool 12, and the photographing of the first image is completed.
  • the tool 12 in a state of being rotated by 360 ° ⁇ m 0 + 2 ° from the time when the second photographing signal is output is photographed to obtain an image of the second tool 12, ... p -After the image capturing of the first image is completed, and the image of the p-th tool 12 is captured by capturing an image of the tool 12 rotated 360 ° ⁇ m 0 + p ° from when the p-th image capturing signal was output.
  • the tool 12 is rotated 360 ° ⁇ m 0 + 360 ° after the 360th image signal is output, and the 360th image is captured.
  • the image of the tool 12 may be obtained.
  • the time between shootings needs to be long enough until the tool shape measuring device 1a finishes shooting the tool 12 and is ready for the next shooting.
  • m 0 is a natural number.
  • the tool shape measuring device 1a is provided with a tool rotation angle input unit (not shown) for inputting the rotation angle of the tool 12.
  • the tool rotation angle input unit is provided, for example, at the control device 20.
  • the rotation angle of the tool 12 at the rotation angle desired to be photographed is input to the control device 20 from the tool rotation angle input unit.
  • the operator selects the angle of the tool 12 that needs to be photographed by looking at the image photographed the first time (the necessary image of the plurality of images obtained by the first photographing). Then, when it is desired to shoot only with the selected angle, the rotation angle of the tool 12 to be shot is input from the tool rotation angle input unit. For example, when a tool having a rotation angle of 1 ° and 2 ° is photographed, 1 ° and 2 ° are input using the tool rotation angle input unit.
  • the control device 20 is configured to output the first output and then output the second output in order to capture an image of the tool 12 at the rotation angle input by the tool rotation angle input unit.
  • the second shooting (shooting of the second group) is performed, and only the image of the tool 12 at the rotation angle desired to be shot can be obtained.
  • control device 20 is configured to output the first output and then output the second output in order to capture the image of the tool 12 at the rotation angle input by the tool rotation angle input unit, the image data is output. Saves memory savings.
  • the tool shape measuring device 1a is provided with a light emitting device (illuminating device; for example, a strobe) 61 that emits light in synchronization with the photographing of the camera 22. Then, the strobe 61 emits light toward the tool 12 in response to the output of the photographing command to the camera 22 by the control device 20.
  • a light emitting device illumination device; for example, a strobe
  • the strobe 61 emits light toward the tool 12 in response to the output of the photographing command to the camera 22 by the control device 20.
  • an LED is adopted as the light emitting body (light emitting source) of the strobe 61.
  • the strobe 61 emits light in order to obtain a clearer still image of the tool 12 and to photograph the tool 12 in a shorter time.
  • the strobe 61 emits light for a shorter time than the shutter of the camera 22 is open, and the strobe 61 emits light within the period of time when the shutter of the camera 22 is open.
  • the strobe 61 is configured to emit light within the time when the shutter of the camera 22 is open (the time when the shutter of the camera 22 is fully open) by the output of the shooting command to the camera 22 by the control device 20. ing.
  • the strobe 61 is configured to emit light at a time slightly after the time when the camera 22 starts the operation of opening the shutter and before the camera 22 starts the operation of closing the shutter. There is.
  • a command may be given to the shutter of the camera 22 and the strobe 61 by a trigger measured by the spindle rotation angle sensor 41, but the strobe 61 emits light before the shutter of the camera 22 is fully opened. It may be lost. In order to avoid this, the timing of light emission of the strobe 61 is delayed (delay is inserted). The strobe 61 is made to emit light when the shutter is fully opened.
  • the light emitting device 61 does not emit light before the shutter of the camera 22 is fully opened. Further, the strobe 61 does not emit light when the shutter of the camera 22 is closed or in the middle of being closed.
  • the camera 22 shoots the tool 12 at a slow shutter speed as described above.
  • the brightness of the LED is high and it is very bright, so it is not necessary to make the shooting environment so dark.
  • the strobe 61 When the strobe 61 is provided, as shown in FIG. 7, the camera 22 is installed on one side and the strobe 61 is installed on the other side with the rotating tool 12 in between. Then, the strobe 61 emits light toward the tool 12 and the camera 22, so that the camera 12 takes an image of the tool 12. At this time, the strobe 61 is configured to emit parallel light 79 toward the tool 12.
  • the strobe 61 functions as a backlight and the camera 22 shoots the silhouette of the tool 12.
  • the traveling direction of the parallel light 79 emitted from the strobe 61 is, for example, the X direction and is orthogonal to the rotation center axis C1 of the tool 12, and the optical axis 71 of the lens 69 of the camera 22 is also in the X direction. It is extended.
  • an alignment adjusting device 73 for adjusting the alignment of the strobe 61 and the camera 22 with respect to the tool 12 may be provided.
  • the alignment adjusting device 73 shown in FIG. 7 adjusts the rotation angle of the strobe 61 around a predetermined axis extending in the Z direction and the rotation angle of the strobe 61 around a predetermined axis extending in the Y direction.
  • the strobe 61 can be rotationally positioned.
  • the camera 22 is also provided with a similar alignment adjusting device.
  • the alignment adjustment device 73 By providing the alignment adjustment device 73, it becomes easy to adjust the traveling direction of the parallel light 79 emitted from the strobe 61 and the optical axis 71 of the lens 69 of the camera 22 so as to be parallel to each other. Further, it becomes easy to make the traveling direction of the parallel light 79 emitted from the strobe 61 orthogonal to the plane of the image pickup element 75 of the camera 22.
  • the tool 12 In the initial state, the tool 12 is rotating at a constant rotation speed, and the time lag time TD is calculated in advance. Further, it is assumed that the tool 12 is located between the strobe 61 and the camera 22 as shown in FIG. 7, and the alignment of the strobe 61 and the camera 22 with respect to the tool 12 is also adjusted.
  • the workpiece 14 is machined while correcting the position of the tool 12 according to the actual shape of the tool 12. Processing can take tens of hours. During such machining, the shape of the tool 12 is sometimes measured by the tool shape measuring devices 1 and 1a to be used for correction of the tool 12 or to check whether the tool 12 needs to be replaced.
  • the number of rotations of the spindle 11 during processing is set by an NC (Numerical Control) device (control device 20).
  • the tool shape measuring device 1, 1a measures the shape of the tool 12 (before processing).
  • the trigger for the measurement is the predetermined value of the spindle rotation sensor (encoder) or the spindle rotation angle sensor 41.
  • the strobe 61 is caused to emit light at the same timing in synchronization with the trigger, an image of the tool 12 at the same angle can be taken at all times while rotating at that rotation speed.
  • the rotation of the tool 12 is stopped unless the tool 12 is removed from the spindle 11, and even when the rotation speed is returned to the original value, the image of the tool 12 at the same angle can be taken at the same timing.
  • the tool 12 is configured to be photographed by the camera 22 according to the rotation angle of the spindle 11 detected by the spindle rotation angle sensor 41, so that the time taken to photograph the tool 12 is minimized. Can be shortened. That is, since the still image of the tool 12 can be obtained by one shot at the maximum rotation angle described above, the tool 12 is shot many times and the still images obtained by these shots are compared with each other. You don't have to.
  • the shutter speed of the camera 22 is slowed (for example, the shutter is opened for a time longer than one rotation of the tool 12) and the tool 12 is photographed, as shown in FIG.
  • the reflection of the tool 12 is deteriorated on the outer peripheral side of the tool 12, the contour 77 of the tool 12 is blurred, and the shape of the tool 12 cannot be accurately obtained.
  • the blurring of the subject disappears and the contour 77 of the tool 12 becomes clear as shown in FIG. 8 (b). Then, the accurate shape of the tool 12 can be obtained.
  • control device 20 is configured to change the timing of outputting the photographing command to the camera 22 according to the rotation speed of the spindle 11, so that the rotation speed of the spindle 11 changes. Even in such a case, the still image of the maximum outer shape of the tool 12 can be easily obtained.
  • the strobe 61 emits light toward the tool 12 according to the output of the photographing command to the camera 22 by the control device 20, so that the shutter of the camera 22 is opened and closed.
  • the tool 12 can be imaged in a shorter time than in the case of the image capturing, and a clear image of the rotating tool 12 can be obtained easily at low cost. That is, it is cheap and easy to reduce the light emission time of the strobe 61 as compared with the case of increasing the shutter speed of the camera 22 (shortening the time when the shutter is open).
  • the strobe 61 which has a fast rise time and is capable of emitting light for a short period of time, even if an inexpensive camera is used as compared to a camera capable of high-speed shutter, the sharpness of the rotating tool 12 can be sharpened. Images can be obtained.
  • the camera 22 is installed on one side of the rotating tool 12 and the strobe 61 is installed on the other side. Since the parallel light 79 is emitted toward the camera 22, the tool 12 is photographed by the camera 22, so that the silhouette of the tool 12 having no difference from the actual outer shape of the tool 12 can be photographed.
  • the outer periphery (edge; contour) 77 of the tool 12 becomes clear, and the accurate outer shape of the tool 12 can be easily obtained.
  • the spindle rotation angle sensor 41 outputs a continuous pulse signal when the spindle 11 is rotating, and also emits a pulse signal of one cycle every rotation of the spindle 11. With such a configuration, it is possible to easily detect the rotation speed of the spindle 11 that is rotating at a high speed with a simple structure.
  • the spindle rotation angle sensor 41 and the rotary encoder are used to detect the rotation angle and the rotation speed of the spindle 11 and the tool 12, but the spindle rotation is detected from another device such as a function generator. It may be configured to emit a signal similar to that of the angle sensor 41 or the rotary encoder to take a picture with the camera 22.
  • all the images obtained by shooting may be combined to obtain a still image of the maximum outer shape of the tool 12. Then, the tool correction may be performed based on the maximum outer shape of the tool 12.
  • a tool shape measuring method for measuring a shape of a tool for example, an end mill
  • the spindle rotation angle detecting step of detecting a rotation angle of the spindle and the spindle rotation angle. It may be grasped as a tool shape measuring method having a photographing step of photographing the tool with a camera according to the rotation angle of the spindle detected in the detecting step.
  • the spindle rotation angle detecting step is a step of detecting the rotation number (rotational angular velocity) of the spindle, and in the photographing step, the timing of the photographing is changed according to the rotation number of the spindle. May be.
  • the light emitting device may emit light toward the tool when the image is captured in the image capturing step.
  • the light emitting device may emit light during the time when the shutter of the camera is open.
  • a camera for photographing in the photographing step is installed on one side with the rotating tool in between, and the light emitting device is installed on the other side, and the light emitting device is the tool ( By emitting light toward the camera, the image of the tool is captured by the camera in the image capturing step, and the light emitting device may emit parallel light toward the tool.
  • a continuous pulse signal is output while the spindle is rotating (at a constant speed), and a pulse signal of one cycle is output each time the spindle rotates once. It may be a process.
  • a first step and a second step are provided, and in the first step, a plurality of images in a state where the main shaft is rotated by a predetermined angle are photographed, and the first step is performed. It is also possible to capture only the image of the tool at a predetermined rotation angle in the second step after capturing the image in.

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