Tool imaging device

Abstract

Provided is a tool imaging device (1) capable of stably and accurately imaging the state of the cutting edge of a cutting tool. That is, a work rotation unit (2) that sequentially rotates a work (W) at a predetermined rotation angle, a rotation angle management unit that detects the rotation angle of the work (W), a rotation angle control unit (5) that controls the rotation angle of the work (W), a work slide movement unit (4) that slides the work (W), a target site detection unit (6) that detects a part of the cutting edge of the work (W) as a target site (Wt), a target site imaging unit (7) that images the target site (Wt) of the work (W), and an image processing unit (8) that performs image processing on imaging data (Im). The target site detection unit (6) pre-specifies, for each of a plurality of cutting edges in the work (W), at least one site along the extending direction of the cutting edge as the target site (Wt), and the target site imaging unit (7) sequentially and continuously images the target site (Wt) of the sequentially rotating work (W) at the same imaging angle each time.

Description

Technical Field

[0001] The present invention relates to a tool imaging device, and more particularly to a tool imaging device for imaging a cutting edge of a round bar-shaped cutting tool having a cutting edge, such as a drill bit or an end mill, using the cutting tool as a workpiece.

Background Art

[0002] For example, round bar-shaped cutting tools such as drill bits used in ball mills, lathes, hand drills, etc., and end mills used in milling machines, etc., having a plurality of cutting edges such as two cutting edges (two edges) or four cutting edges (four edges), etc., with excellent cutting efficiency are actively used. From the viewpoint of improving the machining accuracy of the workpiece to be cut, in particular, quality control of the cutting edge is important.

[0003] As an apparatus for managing the cutting edge of the round bar-shaped cutting tool as described above, for example, an apparatus that images the cutting edge and the cutting tip and confirms the quality based on this image has been proposed (see, for example, Patent Documents 1 and 2).

[0004] Also, as an apparatus for managing the cutting edge of a cutting tool, for example, in a cutting apparatus, there has been proposed an apparatus that is equipped on-machine with means for imaging the cutting edge from the side of a rotating or moving cutting tool and selecting a used image from a plurality of imaged images for use in managing the cutting edge (see, for example, Patent Document 3).

[0005] Also, as a method for managing the cutting edge of a cutting tool, for example, a method has been proposed in which a binary image that distinguishes the cutting edge from other parts is obtained from an imaged image, and the arrangement angle of the cutting edge is obtained based on this image (see, for example, Patent Document 4).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

[0007] In a round bar-shaped cutting tool such as a drill bit described above, while a blade portion is formed on the circumferential side surface, there is a portion scooped out by the formation of the blade portion in the vicinity thereof. For this reason, it is difficult to accurately focus on the blade portion during imaging of the round bar-shaped cutting tool, and there is a problem that stable imaging is difficult.

[0008] In general, since the above-described cutting tool is made of steel, there is a problem that it is difficult to accurately image the state of the blade portion because of the glare caused by the surface gloss peculiar to steel.

[0009] In addition, in a conventional imaging apparatus, generally, imaging is performed in a wide range including the blade portion of the cutting tool and also including scooped portions and the like. However, when such an imaging range is used, the size of the imaging data becomes larger than necessary, and there are also problems in terms of data handling properties, etc., such as including images of unnecessary portions for the management of the cutting tool.

[0010] The present invention has been made in view of the above problems, and an object thereof is to provide a tool imaging apparatus that can accurately image the state of the blade portion in a cutting tool with stable focus, has excellent imaging quality, and is also excellent in data handling properties and imaging efficiency. [Means for Solving the Problems]

[0011] To solve the above problems, the present inventors have conducted intensive studies. As a result, they have found that by providing a target site detection means for preliminarily specifying a part of the blade portion extended on the cutting tool as a target site, and a target site imaging means for imaging the target site, and imaging the target site of the blade portion at the same imaging angle, it is possible to accurately image the state of the blade portion with a stable focus, a small number of imaging shots, and a small data amount without being affected by glare or the like of the workpiece. Thereby, it has been found that an apparatus with extremely excellent imaging quality and excellent data handling properties and imaging efficiency can be realized, and the present invention has been completed.

[0012] That is, the present invention is a tool imaging apparatus that uses a round bar-shaped cutting tool used for cutting a workpiece as a workpiece, and images a blade portion spirally extending in a plurality of strips on a circumferential side surface of the cutting tool, the apparatus including: a workpiece rotation means for clamping the cutting tool and sequentially rotating the cutting tool at a predetermined rotation angle about an axis of the cutting tool as a rotation axis; a rotation angle management means connected to the workpiece rotation means or provided integrally with the workpiece rotation means for detecting a rotation angle of the cutting tool by the workpiece rotation means; a rotation angle control means for controlling the rotation angle of the cutting tool by the workpiece rotation means; a workpiece slide movement means for sliding the cutting tool clamped by the workpiece rotation means in a direction along the axis of the cutting tool by sliding the workpiece rotation means in a direction along the axis of the cutting tool; a target site detection means for preliminarily detecting at least a part of the blade portion of the cutting tool as a target site for management of the blade portion; a target site imaging means for imaging the target site in the blade portion from the circumferential side surface side of the cutting tool; and an image processing means for performing image processing on imaging data in the target site imaging means, wherein the target site detection means specifies at least one site along an extending direction of each of the plurality of blade portions in the cutting tool as the target site, and the target site imaging means sequentially and continuously images the target site of the cutting tool sequentially rotating at the predetermined rotation angle at the same imaging angle.

[0013] In the tool imaging device of the present invention, in the above aspect, the target site detection means specifies, for each of the plurality of blade portions in the cutting tool, a single site along the extending direction of the blade portion as the target site, and the target site imaging means can adopt a configuration in which the single target site in each of the plurality of blade portions is sequentially and continuously imaged at the same imaging angle as the cutting tool rotates by the predetermined rotation angle.

[0014] In the tool imaging device of the present invention, in the above aspect, the target site detection means further specifies, for each of the plurality of blade portions in the cutting tool, another site along the extending direction of the blade portion as the target site as the cutting tool slides due to the work slide moving means, and the target site imaging means can adopt a configuration in which the other target site in each of the plurality of blade portions is sequentially and continuously imaged at the same imaging angle as the cutting tool rotates by the predetermined rotation angle.

[0015] In the tool imaging device of the present invention, in the above aspect, the target site detection means repeats the operation of specifying, for each of the plurality of blade portions in the cutting tool, a further other site along the extending direction of the blade portion as the target site as the cutting tool further slides due to the work slide moving means, and the target site imaging means repeats the operation of sequentially and continuously imaging the further other target sites in each of the plurality of blade portions at the same imaging angle as the cutting tool rotates by the predetermined rotation angle, and can adopt such a configuration.

[0016] In the tool imaging device of the present invention, in the above aspect, the target site detection means specifies a plurality of target sites along the extending direction of a single one of the plurality of blade portions in the cutting tool, and the target site imaging means may adopt a configuration in which the plurality of target sites specified for the single blade portion are sequentially and continuously imaged at the same imaging angle as the cutting tool rotates by the predetermined rotation angle and as the cutting tool slides.

[0017] In the tool imaging device of the present invention, in the above aspect, the attention area detection means specifies a plurality of attention areas at a plurality of locations along the extending direction of another blade part of the same row among the plurality of blade parts of the cutting tool, and the attention area imaging means images the plurality of attention areas specified for the other blade part of the same row at the same imaging angle each time, successively and continuously, as the cutting tool rotates by the predetermined rotation angle and as the cutting tool slides. Such a configuration may be adopted.

[0018] In the tool imaging device of the present invention, in the above aspect, the attention area detection means repeatedly performs an operation of specifying a plurality of attention areas at a plurality of locations in the extending direction of still another blade part of the same row among the plurality of blade parts of the cutting tool, and the attention area imaging means repeatedly performs an operation of imaging the plurality of attention areas specified for the still another blade part of the same row at the same imaging angle each time, successively and continuously, as the cutting tool rotates by the predetermined rotation angle and as the cutting tool slides. Such a configuration may be adopted.

[0019] In the tool imaging device of the present invention, in the above aspect, the attention area imaging means can adopt a configuration including a shutter mechanism.

[0020] In the tool imaging device of the present invention, in the above aspect, the attention area imaging means can adopt a configuration including a strobe illumination that irradiates at least the position of the attention area among the plurality of blade parts extending on the cutting tool.

[0021] In the tool imaging device of the present invention, in the above aspect, the attention area imaging means may adopt a configuration in which an imaging lens is provided inclined so as to correspond to the attention area in the blade part spirally extending on the cutting tool.

[0022] In this specification, "imaging successively and continuously at the same imaging angle each time" refers to an operation of imaging an attention area as follows. That is, for example, when imaging a target part (cutting edge) of a cutting tool that rotates sequentially at a predetermined rotation angle or slides in the axial direction using a target part imaging means, the camera and lens constituting the target part imaging means do not change their orientation (imaging angle) in any direction, and the focus position (focal position) on the circumferential side surface of the cutting tool changes at corresponding positions. This means that, for example, in the tool imaging device 1 shown in FIG. 1, the imaging area lens 71 and the imaging area camera 72 constituting the target part imaging unit 7 are focused so as to be able to photograph the target part Wt on the workpiece (cutting tool) W. These imaging area lens 71 and imaging area camera 72 can image other target parts Wt on the workpiece W without changing the imaging angle even when the workpiece W rotates or slides.

[0023] In addition, in this specification, the "cutting edge extending spirally in a plurality of lines on the circumferential side surface of the cutting tool" refers to, for example, cutting tools such as drills and end mills having a plurality of lines such as two-edge (2 edges) or four-edge (4 edges). Also, the number of cutting edges on the cutting tool may be more than the above.

Advantages of the Invention

[0024] According to the tool imaging device of the present invention, as described above, it includes a target part detection means for preliminarily specifying a part of the cutting edge extending on the circumferential side surface of the cutting tool as a target part, and a target part imaging means for imaging the target part, and adopts a configuration for imaging the target part of the cutting edge at the same imaging angle. Thereby, without being affected by the glare or the like of the cutting tool as the workpiece, the state of the cutting edge can be accurately imaged with a stable focus, a small number of imaging shots, and a small data amount. Therefore, a tool imaging device with excellent imaging quality, as well as excellent data handling performance and imaging efficiency, can be realized.

[0025] Other objects, features, and advantages of the present invention will become apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10A

Figure 10B

Embodiments for Carrying Out the Invention

[0027] Hereinafter, the first and second embodiments of the tool imaging device according to the present invention will be given, and detailed description will be made with appropriate reference to the drawings. In addition, each drawing used in the following description may show a characteristic part slightly enlarged for the sake of easy understanding of the characteristics of the tool imaging device of the present invention, and the dimensional ratios of each component may be different from the actual ones. Also, the materials, dimensions, etc. exemplified in the following description are merely examples, and the present invention is not limited thereto, and can be appropriately modified and implemented without changing the gist thereof.

[0028] Also, in this specification, in both the following first embodiment and second embodiment, the description will be made with reference to the tool imaging device 1 shown in FIG. 1. That is, the tool imaging device 1 described in each of the following embodiments basically has the same configuration. However, for the convenience of explaining the imaging position and operation mode with respect to the cutting tool (work W) as the object to be imaged, in this specification, the description will be divided into the first embodiment and the second embodiment and described separately.

[0029] <First Embodiment> The tool imaging device according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3, FIGS. 6 to 10A, and FIGS. 10B. FIG. 1 is a schematic diagram showing the overall configuration of the tool imaging device 1 of the present embodiment. FIG. 2 is a flowchart showing an example of the operation when imaging the work W by the tool imaging device 1 shown in FIG. 1. FIGS. 3(a) to (h) are schematic diagrams showing the imaging positions of the attention sites Wt specified in the extending directions of the blade portions Wh of different strips A to D in the work W composed of a cutting tool having a four-edge (4-edge) configuration. FIG. 3(i) is a schematic diagram showing an example of merging the images obtained by imaging the attention sites Wta, Wtb, Wtc, and Wtd shown in FIGS. 3(a) to (h). FIGS. 6(a) to (c) are schematic diagrams showing the imaging positions of the attention sites Wt in each of the strips A to D. FIG. 7 is a diagram obtained by merging the images of the attention sites in each of the strips A to D shown in FIGS. 6(a) to (c). FIG. 7(a) shows an example of merging the images of the attention sites of strip A, FIG. 7(b) shows an example of merging the images of the attention sites of strip B, FIG. 7(c) shows an example of merging the images of the attention sites of strip C, and FIG. 7(d) shows an example of merging the images of the attention sites of strip D. FIG. 8 is a schematic diagram showing the overall configuration of another example of the tool imaging device 1A of the present embodiment. FIGS. 9(a) and (b) are schematic diagrams showing an example of the operation of the tool imaging device 1. FIGS. 10A and 10B are schematic diagrams showing an example of the operation of the tool imaging device 1.

[0030] The tool imaging device 1 according to the present invention uses a substantially round bar-shaped cutting tool used for cutting a workpiece, for example, a drill bit used for a ball mill, a lathe, a hand drill, etc., or an end mill used for a milling machine, etc. as a workpiece W, and images a plurality of spiral blade portions Wh extending on the circumferential side surface of the workpiece (cutting tool) W. As such a workpiece W, as described above, for example, those having a plurality of blades such as two blades (2 edges) or four blades (4 edges) can be mentioned. The tool imaging device 1 of the present embodiment uses various cutting tools as described above as the workpiece W, and by performing quality control by imaging the blade portion, it is possible to ensure good machining performance of the cutting tool.

[0031] [Overall configuration of the tool imaging device] As shown in FIG. 1 (see also FIG. 3, etc.), the tool imaging device 1 of the present embodiment includes a workpiece rotation unit (workpiece rotation means) 2 that sequentially rotates the workpiece W at a predetermined rotation angle with the axis of the workpiece W as the rotation axis, a rotation angle management unit (rotation angle management means) 3 that detects the rotation angle of the workpiece W by the workpiece rotation unit 2, a rotation angle control unit (rotation angle control means) 5 that controls the rotation angle of the workpiece W by the workpiece rotation unit 2, a workpiece slide movement unit (workpiece slide movement means) 4 that slides the workpiece W in the direction along the axis, a target site detection unit (target site detection means) 6 that detects at least a part of the blade portion Wh of the workpiece W in advance as a target site Wt for quality control of the blade portion Wh, a target site imaging unit (target site imaging means) 7 that images the target site Wt in the blade portion Wh of the workpiece W, and an image processing unit (image processing means) 8 that performs image processing on the imaging data Im in the target site imaging unit 7, and is generally configured.

[0032] Furthermore, in the tool imaging device 1 of the present embodiment, the target site detection unit 6 specifies in advance at least one (one location) portion along the extending direction of the blade portion Wh as the target site Wt (Wta, Wtb, Wtc, Wtd) for each of the plurality of blade portions Wh (refer to the strips A to D in FIGS. 3(a) to (h)) in the workpiece W. Then, the target site imaging unit 7 sequentially and continuously images the target site Wt of the workpiece W that rotates sequentially at a predetermined rotation angle at the same imaging angle.

[0033] In the tool imaging device 1 of the example shown in FIG. 1, by using the motor 21 that constitutes the work rotation unit 2 as a pulse motor (stepping motor), the work rotation unit 2 also functions as a rotation angle management unit and has an integrated configuration.

[0034] The work rotation unit 2 clamps a work W made of a substantially round bar-shaped cutting tool, and sequentially rotates the work W at a predetermined rotation angle with the axis of the work W as the rotation axis. The work rotation unit 2 in the illustrated example includes a motor 21 for rotating the work W and a clamp member 22 for clamping the work W and transmitting the rotation of the motor 21 to the work W, and the motor 21 is configured to be supported by the housing.

[0035] The motor 21 is not particularly limited, and a servo motor, a pulse motor, or the like capable of controlling the rotation angle can be adopted without any limitation. For example, when a pulse motor is used for the motor 21, the work W can be rotated at a desired rotation angle with high accuracy, and at the same time, it also has the function of the rotation angle management unit described later, so the entire device can be configured simply.

[0036] The clamp member 22 is also not particularly limited, and for example, a clamp generally used in a lathe or the like can be used without any limitation.

[0037] The rotation angle management unit 3 detects the rotation angle of the work W by the work rotation unit 2 by being connected to the work rotation unit 2 or being provided substantially integrally with the work rotation unit 2 by using the above-described pulse motor for the work rotation unit 2.

[0038] On the other hand, for example, as in the tool imaging device 1A shown in FIG. 8, it is also possible to provide a rotation angle management unit 3 outside the motor 21 so as to be connected to the motor 21. As such a rotation angle management unit 3, for example, a conventionally known one such as a rotary encoder or a frequency dividing means can be adopted without any limitation. When adopting the configuration of connecting the rotation angle management unit 3 from the outside of the motor 21 as described above, a servo motor is adopted as the motor 21, and it is possible to detect the rotation angle of this motor 21 by the rotation angle management unit 3.

[0039] As described above, the rotation angle control unit 5 controls the rotation angle of the work W by the work rotation unit 2. In the example shown in FIG. 1, it is composed of a motor control signal generator 51 and a motor driver 52.

[0040] The motor control signal generator 51 sends a control signal Dp for rotating the motor 21 at a predetermined rotation angle to the motor driver 52. For example, a pulse generator or the like generally used in this field can be adopted. The motor driver 52 supplies a drive current Rt for rotationally driving the motor 21 to the motor 21. For example, a general motor driver can be used.

[0041] The work slide moving unit 4 slides and moves the work rotation unit 2 in the direction along the axis of the work W, that is, in the X direction (X-axis direction) shown in FIG. 1, so as to slide and move the work W clamped by the work rotation unit 2 in the X-axis direction. The work slide moving unit 4 in the illustrated example is configured to include a slide motor 41, an X-axis stage 42, and a slide motor driver 43.

[0042] The slide motor 41 transmits a rotational force to the X-axis stage 42 described later to move this X-axis stage 42 in the X-axis direction, and a general motor can be adopted.

[0043] As described above, the X-axis stage 42 converts the rotational force transmitted from the slide motor 41 into moving energy in the X-axis direction by means of a gear mechanism (not shown) provided inside. The work rotation part 2 described above is connected to the end of the X-axis stage 42 on the side opposite to the slide motor 41, and the work rotation part 2, and thus the work W clamped to the work rotation part 2, can be slid in the X-axis direction.

[0044] The slide motor driver 43 supplies a current for rotationally driving the slide motor 41 to the slide motor 41. Similar to the motor driver 52 described above, for example, a general motor driver can be used.

[0045] The attention area detection unit 6 detects at least a part of the cutting edge Wh of the work W in advance as an attention area Wt for quality control of the work W. The attention area detection unit 6 in the illustrated example is arranged at a position separated from the open end side of the work W opposite to the work rotation part 2, and includes a detection area lens 61, a detection area camera 62, a fixed plate 65, and a detection illumination 67.

[0046] The detection area lens 61 is arranged coaxially with the axis of the work W, and is configured such that an image of the work W viewed from the open end side is incident from the incident end. The detection area lens 61 makes the incident image of the work W incident on the detection area camera 62 described below while enlarging or reducing it.

[0047] The detection area camera 62 is attached to the rear end side of the detection area lens 61, and is configured such that an image of the open end side of the work W incident on the detection area lens 61 can be incident and detected. The detection area camera 62 is not particularly limited, and any camera used in inspection equipment or the like can be adopted without any limitation.

[0048] The detection illumination 67 is disposed between the incident end of the detection area lens 61 and the open end side of the workpiece W, and is illumination that irradiates the open end side of the workpiece W. The detection illumination 67 is not particularly limited, and illumination or the like that has been conventionally used in inspection apparatuses or the like can be adopted without any limitation.

[0049] The attention area detection unit 6, with the above configuration, observes the end surfaces of the blade portions Wh provided in a plurality of stripes (stripes A to D) from the open end side of the workpiece W (see the left side views in FIGS. 3(a) to (h)), thereby specifying the attention area Wt for imaging in the blade portions Wh. At this time, as shown in FIGS. 9(a) and (b), from the viewpoint of accurately determining the focus on the workpiece W, it is preferable to appropriately adjust the position of the attention area detection unit 6 in the Y-axis direction and / or the Z-axis direction in the figure.

[0050] In addition, in the present embodiment, the attention area detection unit 6 is mainly described by a method of observing the end surfaces of the blade portions Wh using the detection area camera 62, but it is not limited thereto. For example, an optical sensor 68 as shown in FIG. 9(a) may be used in combination. Also, in the present embodiment, in addition to the attention area detection unit 6, it is preferable from the viewpoint that the attention area Wt in the blade portions Wh can be more accurately specified by a plurality of cameras to specify the attention area Wt in the blade portions Wh while observing the circumferential side surface of the workpiece W by the attention area imaging unit 7 described later.

[0051] The attention area imaging unit 7 images the attention area Wt in the blade portions Wh from the circumferential side surface of the workpiece W, that is, the side surface on which the blade portions Wh are formed. The attention area imaging unit 7 in the illustrated example is schematically configured to include an imaging area lens (imaging lens) 71, a rotary stage 73, an imaging area camera 72, a mounting plate 75, a linear guide 76, and imaging illumination 77. Further, the attention area imaging unit 7 further includes a frequency divider 78 connected to the above-described motor control signal generator 51, and a strobe driver 79 connected to this frequency divider 78.

[0052] The imaging area lens 71 is configured such that an image of the workpiece W as viewed from the circumferential side surface, i.e., an image of the target site Wt, enters from the incident end in a direction orthogonal to the axis of the workpiece W. The imaging area lens 71 causes the image of the target site Wt of the incident workpiece W to enter the imaging area camera 72 described later while magnifying or reducing the image.

[0053] Although detailed illustration is omitted, it is preferable that the imaging area lens 71 of the target site imaging unit 7 is provided so as to be inclined corresponding to each target site Wt in the blade portion Wh extending spirally on the workpiece W. In this way, by inclining the imaging area lens 71 according to the target site Wt, i.e., the inclination angle of the blade portion Wh, visual recognition and imaging by the imaging area camera 72 described later will be accurate.

[0054] The imaging area camera 72 is attached to the rear end side of the imaging area lens 71, and is configured to be able to receive the image of the target site Wt of the workpiece W that has entered the imaging area lens 71. The imaging area camera 72 sends the imaging data Im of the target site Wt toward the image processing unit 8 described later. The imaging area camera 72 is not particularly limited, and any camera used in inspection equipment or the like can be adopted without any limitation.

[0055] The rotary stage 73 has a central axis (not shown) attached to the mounting plate 75 described later, and is configured to be able to rotate about this central axis. The imaging area lens 71 and the imaging area camera 72 are attached to the upper surface side of the rotary stage 73. Thereby, the angles of the imaging area lens 71 and the imaging area camera 72 with respect to the workpiece W can be changed as the rotary stage 73 rotates.

[0056] As described above, the mounting plate 75 has the central axis of the rotary stage 73 attached thereto, and rotatably supports the rotary stage 73, as well as the imaging area lens 71 and the imaging area camera 72 attached to the upper surface side of the rotary stage 73. Further, although not shown in detail, the mounting plate 75 is provided with a through hole through which a linear guide 76, which will be described later, can be inserted in the plane direction of the mounting plate 75.

[0057] The linear guide 76 is, for example, a rod-shaped member made of a metal material such as stainless steel. As described above, the linear guide 76 is inserted in the plane direction with respect to the mounting plate 75, thereby supporting the mounting plate 75 and the rotary stage 73 that supports the imaging area lens 71 and the imaging area camera 72 so as to be slidable in the longitudinal direction of the linear guide 76.

[0058] The imaging illumination 77 is disposed between the incident end of the imaging area lens 71 and the circumferential side surface of the work W, and irradiates at least the attention part Wt of the work W. The imaging illumination 77 is not particularly limited, and a strobe illumination or the like conventionally used in inspection apparatuses or the like can be adopted without any limitation.

[0059] As shown in FIGS. 9(a) and 9(b), it is also preferable to appropriately adjust the positions of the attention part imaging unit 7, the mounting plate 75, and each element installed thereon in the Y-axis direction and / or the Z-axis direction in the drawing. Here, when moving the mounting plate 75 in the X-axis direction, it is slid in the longitudinal direction of the linear guide 76 for movement. Also, although details will be described later, by appropriately rotating the rotary stage 73, the imaging area lens 71 and the imaging area camera 72 are rotated and moved at an elevation angle θ in a plan view, so that the imaging angle with respect to the attention part Wt of the work W can be appropriately changed.

[0060] The divider 78 receives the control signal Dp sent from the motor control signal generator 51 described above in parallel with the input to the motor driver 52. Further, the divider 78 receives an imaging control signal Ip2 that is calculated and sent based on the imaging data in the attention part imaging unit 7 from the image processing unit 8, which will be described later.

[0061] Then, the frequency divider 78 sends out a strobe drive signal Ls synchronized with the control signal Dp to the strobe driver 79 described later. In addition, the frequency divider 78 sends out an imaging trigger signal Tr synchronized with the control signal Dp to the imaging area camera 72. As a result, for example, when a shutter mechanism (not shown) is installed in the imaging area lens 71 or its peripheral part in the attention site imaging unit 7, the attention site Wt of the workpiece W can be imaged without blurring at an optimal timing by the shutter operation triggered by the imaging trigger signal Tr.

[0062] The frequency divider 78 is not particularly limited. For example, a device with a counter function can be adopted. Use It can be adopted.

[0063] Based on the strobe drive signal Ls input from the frequency divider 78, the strobe driver 79 sends out a strobe lighting signal St to the imaging illumination 77 in synchronization with the imaging timing of the attention site Wt of the workpiece W by the imaging area camera 72, and lights up the imaging illumination 77. As a result, similar to the effect of the above-described shutter mechanism, the attention site Wt of the workpiece W can be imaged without blurring at an optimal timing.

[0064] The image processing unit 8 receives the imaging data Im of the attention site Wt sent from the imaging area camera 72, performs image processing, and outputs the quality of the blade part Wh of the cutting tool, which is the workpiece W, so that it can be visually recognized on a display or the like. In addition, the image processing unit 8 performs arithmetic processing based on the above-described image processing, and as a result of this arithmetic processing, sends out an imaging control signal Ip2 to the frequency divider 78 and sends out a pulse control signal Ip1 to the motor control signal generator 51.

[0065] The image processing unit 8 is not particularly limited as long as it can perform image processing to the extent that it can determine the quality of the blade part Wh of the workpiece W, and commercially available personal computers, tablet terminals, etc. can be adopted without any restrictions.

[0066] As described above, in the tool imaging device 1, the target site detection unit 6 specifies, for each of a plurality of blade portions Wh in the work W, at least one site (one location) along the extending direction of the blade portion Wh as the target site Wt, and the target site imaging unit 7 sequentially and continuously images the target site Wt of the work W that sequentially rotates at a predetermined rotation angle at the same imaging angle.

[0067] [Detailed operation of the tool imaging device] Regarding the details of the imaging operation of the work W by the tool imaging device 1 having the above configuration, in addition to the overall configuration diagram of FIG. 1, reference is also made to the flowchart of FIG. 2 and the diagram showing the imaging positions of the target sites Wt (Wta, Wtb, Wtc, Wtd) of the work W in FIGS. 3(a) to (i) for explanation. According to the tool imaging device 1 of the present embodiment, by the following operation, the target sites Wt specified for each of the plurality of blade portions Wh of the work W can be efficiently imaged.

[0068] First, the target site detection unit 6 specifies, for each of the blade portions Wh of the plurality of strips A to D in the work W, one site (one location) along the extending direction of the blade portion Wh as the target site Wt (Wta) in the quality control of the blade portion Wh. In the example shown in FIG. 3(a), one location of the blade portion Wh in the strip A of the work W is specified as the target site Wta. At this time, as shown in the flowchart of FIG. 2, after the work W is set on the work rotation unit 2 (S1), the target site detection unit 6 measures the angle of the work W (S2), and sets the initial value in the dividing device 78 according to the angle measured in S2 (S3). Degree is Measured (S2), and the initial value in the dividing device 78 is set according to the angle measured in S2 above (S3).

[0069] Also, in the above specific operation, as shown in FIG. 3(a), the target site Wt (Wta) is specified in a very small area only at the position along the blade portion Wh as compared with the imaging range Ia of a general camera. In this way, by restricting the size of the target site Wt according to each portion of the blade portion Wh as needed, the size of the imaging data Im can be made compact, and it can be made into data that is easy to handle. Then Measured (S2), and the initial value in the dividing device 78 is set according to the angle measured in S2 above (S3).

[0070] Then, as the imaging unit 7 for the target part rotates the work W by a predetermined rotation angle, the imaging unit 7 sequentially and continuously images the one target part Wt at each of the blade parts Wh of strips A to D at the same imaging angle. In the example shown in FIG. 3(b), one location on the blade part Wh of strip B is specified as the target part Wtb. In the example shown in FIG. 3(c), one location on the blade part Wh of strip C is specified as the target part Wtc. Also, in the example shown in FIG. 3(d), one location on the blade part Wh of strip D is specified as the target part Wtc. At this time, the work slide movement unit 4 does not operate, and while the work W rotates at a predetermined rotation angle, it is fixed in the X-axis direction. At this time, as shown in the flowchart of FIG. 2, first, the work rotation unit 2 starts rotating and rotates the work W by a predetermined rotation angle (S4), and in accordance with the imaging trigger signal Tr from the dividing device 78, the imaging unit 7 for the target part images and stores the target parts Wta, Wtb, Wtc, and Wtd of the work W (S5).

[0071] Furthermore, as the work W is slid by a certain amount by the work slide movement unit 4, the target part detection unit 6 specifies, for each of the blade parts Wh of the plurality of strips A to D in the work W, another part (one location) along the extending direction of the blade part Wh as the target part Wt. In the example shown in FIG. 3(e), the target part Wtd on the blade part Wh of strip D is specified. At this time, as shown in the flowchart of FIG. 2, after the work rotation unit 2 and the work W are moved a certain distance in the X-axis direction by the work slide movement unit 4 (S6), the target part Wtd is specified.

[0072] Then, as the work W rotates by a predetermined rotation angle, the imaging unit 7 for the target part sequentially and continuously images the other target parts Wt (one location) at each of the blade parts Wh of strips A to D at the same imaging angle. In the example shown in FIG. 3(f), the target part Wta on the blade part Wh of strip A is specified. In the example shown in FIG. 3(g), the target part Wtb on the blade part Wh of strip B is specified. Also, in the example shown in FIG. 3(h), the target part Wtc on the blade part Wh of strip C is specified.

[0073] Furthermore, as the work slide moving unit 4 further slides the work W by a certain amount, the attention area detection unit 6 repeats the operation of specifying, for each of the cutting edges Wh of the plurality of strips A to D in the work W, another area (one location) along the extending direction of the cutting edge Wh as the attention area Wt (see also Wta, Wtb, Wtc, Wtd shown in FIGS. 7(a) to (d)) (see FIGS. 3(a) to (h)). At this time, as shown in the flowchart of FIG. 2, after moving the work W by a certain distance in the X-axis direction and specifying the attention area Wt, the operation of imaging and storing the attention area Wt of the work W is repeated (the repetition of S5 and S6 shown in FIG. 2).

[0074] At the same time as the above, the attention area imaging unit 7 repeats the operation of sequentially and continuously imaging, at the same imaging angle, further other attention areas Wt (see also Wta, Wtb, Wtc, Wtd shown in FIGS. 7(a) to (d)) for each of the cutting edges Wh of the plurality of strips A to D, as the work W rotates by a predetermined rotation angle. At this time, as the work slide moving unit 4 operates step by step, the work W rotates at a predetermined rotation angle and moves step by step in the X-axis direction.

[0075] Thereafter, when the work rotating unit 2 finishes rotating the work W, the imaging operation of the work W made of the cutting tool is completed (see S7 in FIG. 2).

[0076] Through the above operation, the imaging data Im acquired by the target site imaging unit 7 is sent from the target site imaging unit 7 to the image processing unit 8. At this time, if necessary, as shown in the examples of FIGS. 7(a) to 7(d), by collecting, sorting, and merging the images of each target site Wt for each strip, it is possible to make the defects for each strip easier to see. Also, as shown in the example of FIG. 3(i), by merging the imaging data Im of each target site Wt imaged, without distinguishing the strips, the images of each strip are added and merged according to the distance from the tip of the work W to form one continuous image, so that it is also possible to merge in a more easily confirmable manner. FIG. 3(i) shows an example of merging the imaging data Im obtained by imaging the target sites Wt of the cutting edges Wh in each of the plurality of strips A to D shown in FIGS. 3(a) to 3(h). Specifically, on the left side in the horizontal direction of FIG. 3(i), it shows an example of merging each imaging data Im obtained by imaging the target sites Wta, Wtb, Wtc, and Wtd, which are one part of the cutting edges Wh in the plurality of strips A to D shown in FIGS. 3(a) to 3(d). Also, on the right side in the horizontal direction of FIG. 3(i), it shows an example of merging each imaging data Im obtained by imaging the target sites Wta, Wtb, Wtc, and Wtd, which are other parts of the cutting edges Wh in the plurality of strips A to D shown in FIGS. 3(e) to 3(h).

[0077] Furthermore, in the present embodiment, for example, by using each of the target sites Wt of the work W as shown in FIGS. 6(a) to 6(c), as shown in FIGS. 7(a) to 7(d), by merging the image data of the target sites Wta, Wtb, Wtc, and Wtd in each of the strips A to D, it is also possible to manage the state of the cutting edge Wh more accurately.

[0078] Note that in the tool imaging device 1 of the present embodiment, the operation of imaging the target site Wt of the work W by the target site imaging unit 7 only in the direction perpendicular to the axis of the work W as shown in FIG. 1 is not limited. For example, as shown in the examples of FIGS. 10A and 10B, it is also possible to appropriately change the imaging angle of the target site Wt of the work W by the imaging area lens 71 and the imaging area camera 72.

[0079] In this case, the orientations of the imaging area lens 71 and the imaging area camera 72 are changed from the direction orthogonal to the axis of the workpiece W as shown in FIG. 10A to the elevation angle θ as shown in FIG. 10B. That is, by appropriately rotating the rotary stage 73, the orientations of the imaging area lens 71 and the imaging area camera 72 are changed from the direction orthogonal to the axis of the workpiece W to the elevation angle θ. At this time, in order to maintain the focus on the target part Wt of the workpiece W in accordance with the above change, the mounting plate 75 can be moved in the X-axis direction as in the illustrated example.

[0080] [Function (Effect) of the Tool Imaging Device] According to the tool imaging device 1 having the above configuration, the state of the cutting edge Wh can be accurately imaged with a stable focus, a small number of imaging shots, and a small data volume without being affected by the glare or the like of the cutting tool that is the workpiece W. Therefore, it is excellent in imaging quality and is also excellent in data handling performance and imaging efficiency.

[0081] That is, by imaging the target part Wt at the same imaging angle with the target part imaging unit 7, it becomes possible to image each target part Wt with the same degree of glare and reflection on the surface of the workpiece W. Further, it becomes possible to image the target part Wt of the workpiece W made of a round bar-shaped cutting tool with the same appearance over the entire circumference of the circumferential side surface.

[0082] In addition, since it becomes possible to image the target part Wt with a high magnification and a stable focus by the target part imaging unit 7, for example, even when there are minute chips or the like on the workpiece W, it can be imaged with high resolution, so that it can be used for accurate quality control. Therefore, excellent machining accuracy of the workpiece to be machined by the cutting tool that is the workpiece W can be ensured. In addition, by limiting the imaging range (imaging field of view) by the target part imaging unit 7 to the main range in the cutting edge Wh, that is, only the target part Wt along the cutting edge Wh, the imaging focus is more likely to be achieved, so that, as described above, it becomes possible to image with high resolution.

[0083] In addition, since the imaging data can be obtained with a small number of imaging shots and a significantly smaller data size, for example, compared to the case of unconditionally imaging the entire circumference of a round bar-shaped workpiece at a high magnification, quality control and inspection can be performed using compact imaging data. As a result, the inspection process can be speeded up, and it becomes possible to use inexpensive commercially available personal computers, tablet terminals, etc. as image processing means, leading to a reduction in the cost of the apparatus and, consequently, a reduction in inspection costs and production costs.

[0084] <Second Embodiment> The second embodiment of the present invention will be described in detail with reference to FIGS. 4 and 5 in addition to FIG. 1 referred to in the first embodiment. Note that the tool imaging apparatus described in this embodiment has the same configuration as the tool imaging apparatus described in the first embodiment. Therefore, the same FIG. 1 is referred to, the same reference numerals are given, and the detailed description thereof is omitted.

[0085] The operation of the tool imaging apparatus 1 described in this embodiment is different from the operation of the tool imaging apparatus 1 described in the first embodiment in terms of specifying the attention site Wt for quality control of the cutting edge Wh with respect to the workpiece W and its imaging operation.

[0086] FIG. 4 is a flowchart showing an operation example in this embodiment when imaging a cutting tool as the workpiece W by the tool imaging apparatus 1 shown in FIG. 1. In addition, FIGS. 5(a) to (c) are schematic views showing the imaging positions of Wt specified in the extending direction of the cutting edge Wh of the same strip (strip A) in the workpiece W composed of a cutting tool having a four-edge (4-edge) configuration, and FIG. 5(d) is a schematic view showing an example of merging the images obtained by imaging the attention site Wta shown in FIG. 5(a).

[0087] The details of the imaging operation of the workpiece W by the tool imaging apparatus 1 in this embodiment will be described with reference to the above respective drawings.

[0088] First, the target part detection unit 6 identifies a plurality of target parts Wt (Wta) at a plurality of locations along the extending direction of the cutting edge Wh of one of the same strips A to D in the workpiece W. In the illustrated example, it is the strip A (see Fig. 5(a)). At this time, as shown in the flowchart of Fig. 4, after the workpiece W is set on the workpiece rotation unit 2 (S11), the angle of the workpiece W is measured by the target part detection unit 6 (S12), and the initial value in the dividing device 78 is set according to the angle measured in S12 (S13). Degree is Measured (S12), and the initial value in the dividing device 78 is set according to the angle measured in S12 (S13).

[0089] Then, the target part imaging unit 7 sequentially and continuously images the plurality of target parts Wta specified for the cutting edge Wh of the same strip A at the same imaging angle as the rotation of the workpiece W by a predetermined rotation angle and the slide movement of the workpiece W by the workpiece slide movement unit 4. At this time, the workpiece slide movement unit 4 continuously step-moves the workpiece rotation unit 2 and the workpiece W in the X-axis direction. At this time, as shown in the flowchart of Fig. 4, first, the workpiece rotation unit 2 starts rotating, rotates the workpiece W by a predetermined rotation angle, and at the same time, the workpiece W starts moving in the X-axis direction by the workpiece slide movement unit 4 (S14). Also, in accordance with the imaging trigger signal Tr from the dividing device 78, the target part imaging unit 7 images and stores the target part Wta of the workpiece W (S15).

[0090] Furthermore, the target part detection unit 6 identifies a plurality of target parts Wtd at a plurality of locations along the extending direction of the cutting edge Wh in another same strip, in the examples shown in Figs. 5(b) and 5(c), it is the strip D in the workpiece W. At this time, as shown in the flowchart of Fig. 4, the workpiece slide movement unit 4 returns to the standby position (origin), and the initial value of the dividing device 78 is set according to the next strip D (S16).

[0091] Then, the target part imaging unit 7 sequentially and continuously images the plurality of target parts Wtd specified for the cutting edge Wh of the strip D at the same imaging angle as the rotation of the workpiece W by a predetermined rotation angle and the slide movement of the workpiece W (S15 shown in Fig. 4).

[0092] Furthermore, the attention area detection unit 6 repeatedly performs an operation of specifying a plurality of attention areas (refer to Wtc shown in FIG. 7) at a plurality of locations in the extending direction of the blade portion of yet another same strip, for example, strip C among the blade portions Wh of the plurality of strips A to D in the work W, although detailed illustration is omitted. At this time, as shown in the flowchart of FIG. 4, the work slide moving unit 4 returns to the standby position (origin), and the initial value of the divider 78 is set according to the next strip C (S16). Therefore, in the present embodiment, the above operation is repeated for the number of strips provided on the work W.

[0093] Along with the above, the attention area imaging unit 7 repeatedly performs an operation of sequentially and continuously imaging a plurality of attention areas Wtc specified for the blade portion Wh of strip C, for example, at the same imaging angle, along with the rotation of the work W by a predetermined rotation angle and the slide movement of the work W. At this time, as the work slide moving unit 4 operates continuously, the work W rotates at a predetermined rotation angle and moves continuously in the X-axis direction. Thereby, after specifying the attention area Wt, the operation of imaging and storing the attention area Wt of the work W is repeated (the repetition of S15 and S16 shown in FIG. 4).

[0094] Thereafter, when the work rotation unit 2 finishes rotating the work W and the work slide moving unit 4 finishes moving in the X-axis direction, the imaging operation of the work W made of the cutting tool ends (refer to S17 in FIG. 4).

[0095] By the above operation, the imaging data Im acquired by the attention area imaging unit 7 is sent from the attention area imaging unit 7 toward the image processing unit 8, similar to the case of the first embodiment. At this time, if necessary, by merging the imaging data Im obtained by imaging each attention area Wt, as in the example shown in FIG. 5(d), it becomes possible to manage the state of the blade portion Wh more accurately.

[0096] Furthermore, also in this embodiment, for example, by using each of the target portions Wt of the workpiece W shown in FIGS. 6(a) to 6(c), as shown in FIGS. 7(a) to 7(d), the image data of the target portions Wta, Wtb, Wtc, and Wtd in each of the strips A to D are merged, so that the state of the cutting edge Wh can be managed more accurately.

[0097] Also in the operation of the tool imaging device 1 of this embodiment, similar to the case of the first embodiment, the target portions Wt specified in each of the plurality of strips A to D of the workpiece W can be efficiently imaged.

[0098] Note that when using the tool imaging device 1 in an operation as in this embodiment, since an operation of continuously imaging while continuously moving the workpiece W in the X-axis direction is performed, it is very suitable for the case of imaging and inspecting a workpiece W with not so many strips (for example, about 4 strips).

[0099] <Advantages and Effects> As described above, according to the tool imaging device 1 (1A) of this embodiment, as described above, a target portion detection unit 6 that preliminarily specifies a part of the cutting edge Wh extending on the peripheral side surface of the workpiece W as the target portion Wt, and a target portion imaging unit 7 that images the target portion Wt are provided, and a configuration is adopted in which the target portion Wt of the cutting edge Wh is imaged at the same imaging angle. Thereby, without being affected by the glare or the like of the cutting tool which is the workpiece W, the state of the cutting edge Wh can be accurately imaged with a stable focus, a small number of imaging shots, and a small data amount. Therefore, it is possible to provide a tool imaging device 1 (1A) that is excellent in imaging quality and also excellent in data handling properties and imaging efficiency.

[0100] <Modifications of the Present Invention> In the above, the embodiments of the present invention have been described in detail, but the tool imaging device of the present invention is not limited to the above embodiments, and various changes and modifications can be made and implemented without departing from the principles of the present invention and the scope of the appended claims.

Industrial Applicability

[0101] The tool imaging device of the present invention can accurately image the state of the cutting edge of a cutting tool with a stable focus, has excellent imaging quality, and is also excellent in data handling and imaging efficiency. Therefore, the tool imaging device of the present invention is very suitable for applications such as performing optimal quality control on round bar-shaped cutting tools such as drill bits used in, for example, ball mills, lathes, hand drills, etc., and end mills used in milling machines.

Explanation of Signs

[0102] 1, 1A Tool imaging device 2 Work rotation unit (work rotation means) 21 Motor 22 Clamping member 3 Rotation angle management unit (rotation angle management means) 4 Work slide movement unit (work slide movement means) 41 Slide motor 42 X-axis stage 43 Slide motor driver 5 Rotation angle control unit (rotation angle control means) 51 Motor control signal generator 52 Motor driver 6 Attention area detection unit (attention area detection means) 61 Detection area lens 62 Detection area camera 65 Fixed plate 67 Detection illumination 7 Attention area imaging unit (attention area imaging means) 71 Imaging area lens (imaging lens) 72 Imaging area camera 73 Rotation stage 75 Mounting plate 76 Linear guide 77 Imaging illumination 78 Divider 79 Strobe driver 8 Image processing unit (image processing means) Im Imaging data Dp Control signal Rt Drive current St Strobe lighting signal Tr Imaging trigger signal Ls Strobe drive signal Ip1 Pulse control signal Ip2 Imaging control signal W Workpiece (cutting tool) A - D Stripes (multiple stripes) Wh Cutting edge Wt, Wta, Wtb, Wtc, Wtd Areas of interest

Claims

1. A tool imaging device that uses a round bar-shaped cutting tool used for cutting a workpiece as a workpiece, and images a plurality of helically extending blade portions on the circumferential side surface of the cutting tool, a workpiece rotation means for clamping the cutting tool and sequentially rotating the cutting tool at a predetermined rotation angle about the axis of the cutting tool as a rotation axis, a rotation angle management means connected to the workpiece rotation means or provided integrally with the workpiece rotation means for detecting the rotation angle of the cutting tool by the workpiece rotation means, a rotation angle control means for controlling the rotation angle of the cutting tool by the workpiece rotation means, a workpiece slide movement means for sliding the cutting tool clamped by the workpiece rotation means in a direction along the axis of the cutting tool by sliding the workpiece rotation means in a direction along the axis of the cutting tool, a target site detection means for detecting at least a part of the blade portion of the cutting tool in advance as a target site for management of the blade portion, a target site imaging means for imaging the target site in the blade portion from the circumferential side surface side of the cutting tool, an image processing means for image processing the imaging data in the target site imaging means, and comprising, the target site detection means, based on an image of the open end side of the cutting tool incident on the target site detection means and an image of the circumferential side surface side of the cutting tool incident on the target site imaging means, for each of the plurality of blade portions in the cutting tool, specifies at least one site along the extending direction of the blade portion as the target site, the target site imaging means is characterized in that the target sites of the cutting tool sequentially rotating at the predetermined rotation angle are sequentially and continuously imaged at the same imaging angle respectively.

2. the target site detection means specifies one site along the extending direction of the blade portion as the target site for each of the plurality of blade portions in the cutting tool, the target site imaging means is characterized in that the one target site in each of the plurality of blade portions is sequentially and continuously imaged at the same imaging angle as the cutting tool rotates by the predetermined rotation angle, according to the tool imaging device according to claim 1. Claim 3: The tool imaging device according to claim 2, wherein the image processing means collects, rearranges, and merges the images of the target portions of the cutting tool obtained by the target portion imaging means for each strip of the plurality of blade portions based on the imaging data of the target portions of the cutting tool.

4. The target portion detection means, as the cutting tool slides due to the work slide moving means, specifies, for each of the plurality of blade portions of the cutting tool, another portion along the extending direction of the blade portion as the target portion. Claim 2 or 3: The tool imaging device, wherein the target portion imaging means sequentially and continuously images the other target portions of each of the plurality of blade portions at the same imaging angle as the cutting tool rotates by the predetermined rotation angle.

5. The target portion detection means repeats the operation of specifying, for each of the plurality of blade portions of the cutting tool, a further other portion along the extending direction of the blade portion as the target portion as the cutting tool further slides due to the work slide moving means. Claim 4: The tool imaging device, wherein the target portion imaging means repeats the operation of sequentially and continuously imaging the further other target portions of each of the plurality of blade portions at the same imaging angle as the cutting tool rotates by the predetermined rotation angle.

6. The target portion detection means specifies a plurality of target portions along the extending direction of one of the blade portions of the same strip among the plurality of blade portions of the cutting tool. Claim 1: The tool imaging device, wherein the target portion imaging means sequentially and continuously images the plurality of target portions specified for one of the blade portions of the same strip at the same imaging angle as the cutting tool rotates and as the cutting tool slides. Claim 6: The tool imaging device, wherein the image processing means collects, rearranges, and merges the images of the target portions of the cutting tool obtained by the target portion imaging means for each of the plurality of target portions along the extending direction of one of the blade portions of the same strip.

8. The target part detection means specifies a plurality of target parts at a plurality of positions along the extending direction of another blade part among the plurality of blade parts of the cutting tool. The target part imaging means sequentially and continuously images the plurality of target parts specified for the other blade part of the same row at the same imaging angle as the rotation of the cutting tool by the predetermined rotation angle and the slide movement of the cutting tool. The tool imaging device according to claim 6 or claim 7, characterized in that.

9. The target part detection means repeatedly performs an operation of specifying a plurality of target parts at a plurality of positions in the extending direction of still another blade part of the same row among the plurality of blade parts of the cutting tool. The target part imaging means repeatedly performs an operation of sequentially and continuously imaging the plurality of target parts specified for the still another blade part of the same row at the same imaging angle as the rotation of the cutting tool by the predetermined rotation angle and the slide movement of the cutting tool. The tool imaging device according to claim 8, characterized in that.

10. The tool imaging device according to claim 1 or claim 2, characterized in that the target part imaging means includes a shutter mechanism.

11. The tool imaging device according to claim 1 or claim 2, characterized in that the target part imaging means includes a strobe illumination that irradiates at least the position of the target part among the plurality of blade parts extending on the cutting tool.

12. The tool imaging device according to claim 1 or claim 2, characterized in that the imaging lens is provided obliquely for the target part in the blade part spirally extending on the cutting tool.

Images