JP2013110648A - Bar-shaped workpiece imaging apparatus and bar-shaped workpiece tip end concentric determination apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bar-shaped workpiece imaging apparatus capable of shortening measurement time and managing a bar-shaped workpiece with high precision, and a bar-shaped workpiece tip end concentric determination apparatus.SOLUTION: A bar-shaped workpiece imaging apparatus includes a lens barrel 13 having beam splitters 42 and 43, spectrally separates an image light beam from an object lens 41 into three optical paths P1 to P3 and enlarges the image light beams P1 to P3 of the optical paths to capture the light beams with cameras 14, 15, and 16. By sliding the center positions of the optical axes of the beam splitters 42 and 43, the camera 14 connected to the lens barrel 13 is allowed to capture a tip-end processing part 21, the camera 15 is allowed to capture one part of the profiles of a main unit straight part 23, and the camera 16 is allowed to capture the another part of the profiles of the main unit straight part 23. By analyzing the image signals of these cameras 14, 15, and 16, the quality of a bar-shaped workpiece 10 is determined according to whether the position of the axis center of the tip-end processing part 21 is identical with the axis center of the main unit straight part 23.

Description

  The present invention relates to a rod-like workpiece imaging device for imaging a rod-like workpiece having a tip machining portion, and a rod-like workpiece tip concentricity determining device for managing the quality of such a rod-like workpiece.

  A rod-shaped processing tool (hereinafter referred to as a rod-shaped workpiece) having a tip processing portion may be used to drill a small hole in a metal thin plate or the like. When drilling a high-precision small hole using such a rod-shaped workpiece, it is necessary to accurately manage the shape of the rod-shaped workpiece so that dimensional displacement and eccentricity of the rod-shaped workpiece do not occur. For example, it is conceivable to capture an entire image of a rod-shaped workpiece with a camera, analyze the captured image, and check whether the center of the tip processed portion is at the center of the axis and no eccentricity occurs. As a method for performing alignment management of an object by an optical method using such a camera, an object in which a mark of the object is imaged by the camera and the object is aligned using the imaged mark is proposed. (See Patent Document 1).

JP 2007-19147 A

  However, in the above-described technique for capturing an entire image of a rod-shaped workpiece with a single camera and analyzing the captured image, the rod-shaped workpiece is, for example, a thin plate having a small hole of several micrometers. In this case, it is difficult to determine whether the shape is good or bad. In other words, the diameter of the tip processed portion corresponding to the small hole is on the order of several micrometers, whereas the body portion that supports the tip processed portion is on the order of several millimeters in diameter and several centimeters in length. It is assumed to be on the order of meters. For this reason, if the imaging magnification of the camera is set to a magnification that captures the entire image of the rod-shaped workpiece in the field of view, the captured image of the tip processing portion becomes very small. In this case, if the focus is set on the entire image, the focus on the details of the tip processed portion becomes insufficient. For this reason, it becomes difficult to determine the quality of the shape by analyzing the image of the tip processed portion.

  In such a case, for example, it is conceivable that a plurality of cameras are arranged side by side, and the tip processed portion of the rod-shaped workpiece and the straight portions at both ends are individually imaged with each camera. However, it is physically difficult to arrange a plurality of cameras side by side in a limited space for imaging a rod-shaped workpiece. In addition, when multiple cameras are arranged side by side and the tip processed part of a rod-shaped workpiece and the straight part at both ends are imaged, it is necessary to set the imaging position and set the focus for each camera. It becomes complicated. Furthermore, it is necessary to perform calibration with high accuracy between a plurality of cameras.

  An object of the present invention is to provide a rod-shaped workpiece imaging device and a rod-shaped workpiece tip concentricity determination device capable of imaging a rod-shaped workpiece with a simple structure and high accuracy.

  A rod-shaped workpiece imaging device of the present invention is a rod-shaped workpiece imaging device that images a rod-shaped workpiece having a tip processing portion and a main body straight portion, and is connected to a lens barrel having an objective lens and a lens barrel. A first camera that captures an image, a first beam splitter and a second beam splitter that are disposed in an optical path between the lens barrel and the first camera and are disposed in positions opposite to each other in the optical path; A second camera that images one contour of the main body straight portion via the beam splitter, and a third camera that images the other contour of the main body straight portion via the second beam splitter. And

  According to this configuration, the first camera captures an enlarged image of the tip processing portion of the rod-shaped workpiece, the second camera captures an enlarged image of one contour of the main body straight portion, and the third camera. An enlarged image of the other contour in the main body straight portion can be taken. Further, the second camera is disposed via a first beam splitter provided on the optical path between the lens barrel and the first camera, and the third camera is disposed via a second beam splitter provided on the optical path. Since it is arranged, it can be configured vertically and compactly as a whole. Therefore, it is possible to image a rod-like workpiece with a simple structure and high accuracy.

  In this case, the first beam splitter is displaced so that one contour is at the center of the field of view of the second camera, and the second beam splitter is shifted so that the other contour is at the center of the field of view of the third camera. It is preferable that they are arranged.

  According to this configuration, the first beam splitter is displaced so that one contour is at the center of the field of view of the second camera, and the second beam splitter is displaced so that the other contour is at the center of the field of view of the third camera. By doing so, one contour of the main body straight portion can be reliably imaged with the second camera, and the other contour of the main body straight portion can be reliably imaged with the third camera.

  The workpiece concentricity determination device according to the present invention includes the above-described rod-shaped workpiece imaging device, chuck means for chucking the rod-shaped workpiece at the base, and the rod-shaped workpiece imaging device relative to the rod-shaped workpiece imaging device via the chuck means. The advancing / retreating means for advancing and retreating, the rod-shaped workpiece imaging device and the advancing / retreating means are controlled, and while the rod-shaped workpiece is advanced and retracted, the tip camera is imaged by the first camera, and one contour of the main body straight portion is imaged by the second camera Image processing is performed on the control means for performing an imaging operation, the imaging result of the first camera, and the imaging results of the second camera and the third camera. And a coaxial determination means for performing a determination operation for determining whether or not the axial center of the tip processed portion and the axial center of the main body straight portion coincide with each other.

  According to this configuration, the axial center of the tip processed portion and the axial center of the main body straight portion are obtained from the imaging results of each camera, and the obtained axial center of the tip processed portion matches the axial center of the main body straight portion. Therefore, it is possible to easily and accurately determine the quality of the bar-shaped workpiece.

  In this case, rotation means for rotating the rod-like workpiece around the axis center at a predetermined angular pitch via the chuck means is further provided, and the control means further controls the rotation means to perform an imaging operation at every predetermined angle pitch. The coaxial determination means performs the determination operation at all the angular pitches, and in all the determination operations, when the axial center of the tip processed portion is coincident with the axial center of the main body straight portion, It is preferable to determine that the rod-shaped workpiece is a non-defective product.

  According to this configuration, the imaging operation is performed at every predetermined angular pitch, and it is determined whether the axial center of the tip processed portion and the axial center of the main body straight portion are coincident with each other. Can be detected and determined with high accuracy.

  The rod-shaped workpiece further has a taper reinforcing portion connected to the tip processed portion and the main body straight portion, and a low magnification imaging means for collectively imaging the tip processed portion, the taper reinforcing portion and the main body straight portion, and a rod-shaped workpiece imaging device. And an alternating moving means for causing the bar-shaped workpiece to face each other relatively and alternately via the chuck means with respect to the low magnification imaging means, and a control means further controls the low magnification imaging means and the alternating moving means, Based on the imaging result of the magnification imaging means, it is preferable that the tip processed portion of the rod-shaped workpiece faces the rod-shaped workpiece imaging device.

  According to this configuration, since the tip processing portion of the rod-shaped workpiece faces the rod-shaped workpiece imaging device based on the imaging result of the low-magnification imaging means, the tip processing portion is reliably located within the field of view of the rod-shaped workpiece imaging device. The rod-shaped workpiece can be imaged efficiently.

It is an external view of the rod-shaped workpiece used as judgment object. It is a block diagram which shows the structure of the tip concentricity determination apparatus of the rod-shaped workpiece which concerns on 1st Embodiment. It is explanatory drawing of the workpiece | work rotation mechanism in the front-end | tip concentricity determination apparatus of a rod-shaped workpiece. It is explanatory drawing of the optical path and picked-up image in the tip concentricity determination apparatus of a rod-shaped workpiece. It is explanatory drawing of the optical path and picked-up image in the tip concentricity determination apparatus of a rod-shaped workpiece. It is explanatory drawing of the imaging site | part (visual field) of the rod-shaped workpiece | work by each camera. It is a flowchart explaining the quality determination process in the tip concentricity determination apparatus of a rod-shaped workpiece. It is explanatory drawing of the low magnification camera in the front-end | tip concentricity determination apparatus of a rod-shaped workpiece.

  A rod-shaped workpiece tip concentricity determination device (hereinafter simply referred to as a “tip concentricity determination device”) to which a rod-shaped workpiece imaging device according to an embodiment of the present invention is applied will be described below with reference to the accompanying drawings. The tip concentricity determination device optically determines the quality of the shape, such as whether or not a core misalignment has occurred at the tip of the manufactured bar-shaped workpiece. Hereinafter, the structure of the rod-shaped workpiece will be described for easy understanding.

  FIG. 1 is an external view of a rod-shaped workpiece 10. As shown in FIG. 1, the rod-shaped workpiece 10 is linked to a tip processed portion 21, a taper reinforcing portion 22 connected to the tip processed portion 21, and a taper reinforcing portion 22. The main body straight part 23 and the apparatus attachment part 24 connected to the main body straight part 23 are provided. The tip processed portion 21 has a diameter of the order of several micrometers, and the main body straight portion 23 has a diameter of the order of several millimeters and a length of the order of several centimeters. . The bar-shaped workpiece 10 configured as described above is mounted on, for example, a press drilling device, and used as a punch for punching a precise small hole in a sheet metal.

  FIG. 2 is a block diagram showing the configuration of the tip concentricity determining device 1. As shown in FIG. 2, the tip concentricity determining device 1 is mounted with a rod-shaped workpiece 10, and moves the rod-shaped workpiece 10 forward and backward in the axial direction. A workpiece moving unit 2 that rotates around the center, a workpiece imaging unit 3 (work imaging device) that images the rod-shaped workpiece 10 mounted on the workpiece moving unit 2, and a control unit that controls the workpiece moving unit 2 and the workpiece imaging unit 3. 12 (control means).

  As shown in FIGS. 2 and 3, the workpiece moving unit 2 moves the mounted rod-shaped workpiece 10 in the X-axis direction that is the axial direction and the Y-axis direction that is perpendicular to the X-Y stage 11 (advance / retreat). Means) and a work rotation mechanism 31 (rotation means) that is disposed on the XY stage 11 and rotates the rod-like work 10. The workpiece rotating mechanism 31 also intermittently rotates the rod-shaped workpiece 10 around the axis through the chuck portion 32 (chuck means) for chucking the rod-shaped workpiece 10 at the device mounting portion 24 and the chuck portion 32. And a mechanism main body 33 (see FIG. 3).

  The XY stage 11 and the work rotation mechanism 31 (mechanism body 33) are each connected to the control unit 12. The XY stage 11 moves (advances / retreats) the rod-shaped workpiece 10 in the X-axis direction and the Y-axis direction according to a command from the control unit 12. On the other hand, the workpiece rotation mechanism 31 intermittently rotates the rod-shaped workpiece 10 around its axis at a desired angle pitch according to a command from the control unit 12.

As shown in FIG. 2, the workpiece imaging unit 3 includes a lens barrel 13 having a distal end facing the rod-shaped workpiece 10 on the XY stage 11, a first camera 14 connected to a proximal end portion of the lens barrel 13, A second camera 15 connected to the side base end side of the lens barrel 13 and a third camera 16 connected to the side tip end side of the lens barrel 13 are provided.
The lens barrel 13 has an objective lens 41 provided at the distal end, a second beam splitter 43 at the distal end, a first beam splitter 42 at the proximal end, and a first camera 14 corresponding to the first camera 14 on the optical path. The eyepiece 44 includes a second eyepiece 45 corresponding to the second camera 15, and a third eyepiece 46 corresponding to the third camera 16.

  The objective lens 41 collects light from the rod-shaped workpiece 10 to be inspected and guides it into the lens barrel 13. The second beam splitter 43 splits the image light from the objective lens 41 into an optical path toward the third eyepiece lens 46 and an optical path toward the first beam splitter 42. Similarly, the first beam splitter 42 splits the image light from the second beam splitter 43 into an optical path toward the first eyepiece lens 44 and an optical path toward the second eyepiece lens 45.

  That is, the image light from the rod-shaped workpiece 10 to be inspected is transmitted from the objective lens 41 through the first optical path P1 from the objective lens 41 to the first eyepiece 44 via the second beam splitter 43 and the first beam splitter 42. Through the second beam splitter 43, the second optical path P2 that is split by the first beam splitter 42 and travels toward the second eyepiece 45, and from the objective lens 41, is split by the second beam splitter 43 and the third eyepiece 46. To the third optical path P3 toward the.

  Here, the centers of the optical axes of the first beam splitter 42 and the second beam splitter 43 are arranged so as to be shifted from the centers of the optical axes of the second eyepiece lens 45 and the third eyepiece lens 46. . As a result, the first eyepiece 44 enlarges the image light centered on the distal end processing portion 21 of the image light of the rod-shaped workpiece 10, and the second eyepiece lens 45 enlarges the main body straight portion of the image light of the rod-shaped workpiece 10. 23, the image light centered on one of the left and right contours is enlarged, and the third eyepiece 46 magnifies the image light centered on the other contour of the main body straight portion 23 among the image light of the rod-shaped workpiece 10 ( Details will be described later.)

  The first camera 14, the second camera 15, and the third camera 16 are disposed at positions corresponding to the first eyepiece lens 44, the second eyepiece lens 45, and the third eyepiece lens 46 of the lens barrel 13, respectively. The first camera 14 captures an image of the position of the tip processing portion 21 enlarged by the first eyepiece 44 via the first optical path P1. The second camera 15 captures an image of the position of one of the left and right contours of the main body straight portion 23 magnified by the second eyepiece 45 via the second optical path P2. The third camera 16 captures an image of the position of the other contour of the main body straight portion 23 magnified by the third eyepiece 46 via the third optical path P3.

  Then, the imaging signals of the first camera 14, the second camera 15, and the third camera 16 are sent to the image processing unit 51 of the control unit 12. The image processing unit 51 performs image processing of imaging signals of the first camera 14, the second camera 15, and the third camera 16 in order to determine whether the shape of the rod-shaped workpiece 10 is good or bad. The “coaxial determination means” described in the claims is configured by the control unit 12 including the image processing unit 51.

Next, referring to FIG. 4 and FIG. 5, an image of the rod-shaped workpiece 10 imaged through the first optical path P1, the second optical path P2, and the third optical path P3 is the first camera 14, the second camera 15, and A description will be given of how each image is imprinted on the third camera 16.
As shown in both figures, the image light in the first optical path P1 passing through the objective lens 41, the second beam splitter 43, the first beam splitter 42, and the first eyepiece 44 is magnified by the first eyepiece 44, The image is taken by one camera 14. In this case, the XY stage 11 moves the rod-shaped workpiece 10 so that the tip processing unit 21 is at the center of the visual field of the first camera 14, and an enlarged image of the tip processing unit 21 is captured.

In addition, the image light in the second optical path P <b> 2 that passes through the objective lens 41, the second beam splitter 43, the first beam splitter 42, and the second eyepiece lens 45 is magnified by the second eyepiece lens 45 and captured by the second camera 15. Is done. In this case, the center of the lens barrel 13 is moved to the axial center of the main body straight portion 23 by the XY stage 11, and the main body straight portion of the second camera 15 is caused by the positional deviation of the first beam splitter 42 described above. One of the outlines 23 is the center of the visual field, and the enlarged image is taken.
Similarly, the image light on the third optical path P <b> 3 that passes through the objective lens 41, the second beam splitter 43, and the third eyepiece lens 46 is magnified by the third eyepiece lens 46 and captured by the third camera 16. Also in this case, due to the positional deviation of the second beam splitter 43 described above, the third camera 16 captures an enlarged image of the other contour of the main body straight portion 23 as the center of the visual field.

  FIG. 6 shows a portion captured by the first camera 14, the second camera 15, and the third camera 16 in the entire image of the rod-shaped workpiece 10. As shown in the figure, the first camera 14 captures an enlarged image of the portion A1 of the tip processing portion 21 of the rod-shaped workpiece 10 in the entire image of the rod-shaped workpiece 10. In the second camera 15, an enlarged image of the portion A <b> 2 of one contour of the main body straight portion 23 of the rod-shaped workpiece 10 is captured. The third camera 16 captures an enlarged image of the other contour portion A3 of the main body straight portion 23 of the rod-shaped workpiece 10. Note that the magnifications of images picked up by the first camera 14, the second camera 15, and the third camera 16 can be set independently.

Next, with reference to the flowchart of FIG. 7, the process sequence which determines the quality of the rod-shaped workpiece 10 by the tip concentricity determination apparatus 1 is demonstrated.
When judging the quality of the bar-shaped workpiece 10, first, the operator chucks the bar-shaped workpiece 10 to be inspected on the workpiece rotation mechanism 31 on the XY stage 11 (S01). Next, the control unit 12 drives the XY stage 11 and sets the bar-shaped workpiece 10 chucked by the workpiece rotation mechanism 31 to a desired position (S02).

Here, FIG. 8 shows a configuration for setting the bar-shaped workpiece 10 to a predetermined position. As shown in the figure, a low-magnification camera device 101 (low-magnification imaging means) is provided in the vicinity of the workpiece imaging unit 3 (lens barrel 13) described above. In the low-magnification camera device 101, the XY stage 11 (exchange moving means) is used to move the rod-shaped workpiece 10 directly below the low-magnification camera device 101, and the tip processing portion 21 and the taper reinforcing portion of the rod-shaped workpiece 10 are moved. 22 and the main body straight portion 23 are collectively recognized. And based on this recognition result, the control part 12 calculates | requires the center coordinate of the front-end | tip process part 21, and the center coordinate of the main body straight part 23. FIG. That is, the center coordinates of the part A1 and the center coordinates of the parts A2 and A3 are obtained.
Then, the control unit 12 drives the XY stage 11 based on the center coordinates of the portion A1, moves the rod-shaped workpiece 10 in the X-axis direction and the Y-axis direction as appropriate, and the center of the portion A1 is the first. It sets so that it may come to the visual field center of 1 camera 14.

  In this way, when the rod-shaped workpiece 10 is set at a predetermined position, the tip processing unit 21 is imaged by the first camera 14 (S03). Next, the XY stage 11 is driven again, and the rod-shaped workpiece 10 is moved (advanced) in the X-axis direction so that the center of the part A2 and the part A3 comes to the center of the lens barrel 13 (S04). Here, one contour of the main body straight portion 23 is imaged by the second camera 15 (S05), and at the same time, the other contour of the main body straight portion 23 is imaged by the third camera 16 (S06).

  Subsequently, the control unit 12 analyzes the image of the tip processing unit 21 captured by the first camera 14 in step S03, and obtains the position of the axis of the tip processing unit 21 from the analysis result (S07). In addition, an image of one contour of the main body straight portion 23 captured by the second camera 15 in step S05 and an image of the other contour of the main body straight portion 23 captured in step S06 are analyzed, and this analysis is performed. From the result, the position of the axial center of the main body straight portion 23 is obtained (S08).

  If the position of the axial center of the tip processed portion 21 and the position of the axial center of the main body straight portion 23 are obtained, is the position of the axial center of the tip processed portion 21 and the position of the axial center of the main body straight portion 23 matched? It is determined whether or not (S09). Here, when the bar-shaped workpiece 10 is eccentric, the position of the axial center of the tip processed portion 21 and the position of the axial center of the main body straight portion 23 do not match. Step: If the position of the axial center of the tip processed portion 21 does not match the position of the axial center of the main body straight portion 23 in S09 (S09: No), it is determined that the rod-shaped workpiece 10 is defective (S10), The process ends.

  On the other hand, if it is determined in step S09 that the position of the axial center of the tip processing portion 21 matches the position of the axial center of the main body straight portion 23 (S09: Yes), the workpiece rotating mechanism 31 causes the bar-shaped workpiece to be aligned. 10 is rotated at a predetermined angular pitch (S11). Then, it is determined whether or not the rod-shaped workpiece 10 has made one revolution (S12), and if it has not made one revolution (S12: No), the process returns to step S03. Hereinafter, the process from step S03 to step S12 is repeated until it is determined in step S12 that the work rotation mechanism 31 has made one rotation.

  Thereby, the work rotation mechanism 31 is rotated at a predetermined angular pitch, and the processing of step: S3 to step: S12 is performed for each rotation angle of the rod-shaped work 10, and the position of the shaft center of the tip processing portion 21 and the main body It is determined whether or not the position of the axis of the straight portion 23 matches. In this case, if there is no eccentricity in the rod-shaped workpiece 10, the position of the axial center of the tip processed portion 21 and the position of the axial center of the main body straight portion 23 coincide with each other at any rotation angle. If it occurs, the position of the axial center of the tip processed portion 21 and the position of the axial center of the main body straight portion 23 will not match at a certain rotation angle.

  Steps S3 to S12 are repeated, and the position of the axial center of the tip processed portion 21 and the axial center of the main body straight portion 23 is determined in step S9 regardless of the angle at which the rod-shaped workpiece 10 is set. If it is determined that they match, if it is determined in step S12 that the work rotation mechanism 31 has made one rotation, the bar-shaped work 10 is determined to be a non-defective product (S13), and the process ends.

  As described above, in the tip concentricity determination apparatus 1 according to the embodiment, the first optical path P1, the second optical path P2, and the third optical path P3 are configured in the lens barrel 13 via the first beam splitter 42 and the second beam splitter 43. The first camera 14 images the tip processing portion 21, the second camera 15 images one contour of the main body straight portion 23, and the third camera 16 images the other contour of the main body straight portion 23. Therefore, an image of the tip processing portion 21, an image of the contours on both sides of the main body straight portion 23, and a single workpiece imaging unit 3 can be captured. Thereby, it can be determined appropriately whether the rod-shaped workpiece 10 is eccentric.

  In the tip concentricity determination device 1 of the embodiment, since the optical system is housed in one lens barrel 13, the imaging position and focus are set for each of the first camera 14, the second camera 15, and the third camera 16. There is no need to adjust, and the installation space can be easily secured as a whole. Thereby, while the measurement time for the quality determination of the rod-shaped workpiece 10 can be shortened, product management of the rod-shaped workpiece 10 can be performed with high accuracy.

  The present invention is not limited to the above-described embodiments, and various modifications and applications can be made without departing from the gist of the present invention.

1: tip concentricity determination device, 2: workpiece moving unit, 3: workpiece imaging unit, 10: rod-shaped workpiece, 11: XY stage, 12: control unit, 13: lens barrel, 14: first camera, 15: first 2 cameras, 16: 3rd camera, 21: tip processing part, 22: taper reinforcing part, 23: main body straight part, 31: work rotating mechanism, 32: chuck part, 41: objective lens, 42: first beam splitter, 43: second beam splitter, 44: first eyepiece lens, 45: second eyepiece lens, 46: third eyepiece lens, 51: image processing unit, P1: first optical path, P2: second optical path, P3: third Light path

Claims (5)

A rod-shaped workpiece imaging device that images a rod-shaped workpiece having a tip processing portion and a main body straight portion,
A lens barrel having an objective lens;
A first camera that is connected to the lens barrel and images the tip processing portion;
A first beam splitter and a second beam splitter which are interposed in an optical path between the lens barrel and the first camera, and are arranged so as to be shifted in opposite directions with respect to the optical path;
A second camera that images one outline of the main body straight portion via the first beam splitter;
A rod-shaped workpiece imaging device comprising: a third camera that images the other contour of the main body straight portion via the second beam splitter.   The first beam splitter is positioned so that the one contour is at the center of the field of view of the second camera, and the second beam splitter is positioned so that the other contour is at the center of the field of view of the third camera. The rod-like workpiece imaging device according to claim 1, wherein the rod-like workpiece imaging device is arranged in a shifted manner. A rod-shaped workpiece imaging device according to claim 1 or 2,
Chuck means for chucking the rod-like workpiece at the base;
Advancing / retracting means for relatively moving the rod-shaped workpiece in the axial direction via the chuck means with respect to the rod-shaped workpiece imaging device;
The rod-shaped workpiece imaging device and the advancing / retracting means are controlled to image the tip processing portion with the first camera while the rod-shaped workpiece is advanced and retracted, and one contour of the main body straight portion is imaged with the second camera. And a control means for performing an imaging operation for imaging one contour of the main body straight portion by the third camera;
Whether the imaging result of the first camera and the imaging results of the second camera and the third camera are image-processed, and whether or not the axis of the tip processing part and the axis of the main body straight part match And a coaxial determination means for performing a determination operation. Rotating means for rotating the rod-like workpiece around the axis at a predetermined angular pitch via the chuck means, further comprising:
The control means further controls the rotation means, and performs the imaging operation at every predetermined angle pitch,
The coaxial determination means performs the determination operation at all the angular pitches, and in all the determination operations, the axis of the tip processed portion and the axis of the main body straight portion match. 4. The apparatus according to claim 3, wherein the bar-shaped workpiece is determined as a non-defective product. The rod-shaped workpiece further has a taper reinforcing portion connected to the tip processed portion and the main body straight portion,
Low-magnification imaging means for collectively imaging the tip processed portion, the taper reinforcing portion, and the main body straight portion;
The bar-shaped workpiece imaging device and the low-magnification imaging unit further include an alternating movement unit that causes the bar-shaped workpiece to face relatively and alternately via the chuck unit, and
The control means further controls the low-magnification imaging means and the alternating movement means, and causes the tip processed portion of the rod-shaped workpiece to face the rod-shaped workpiece imaging device based on the imaging result of the low-magnification imaging means. The tip concentricity determination apparatus of the rod-shaped workpiece of Claim 3 or 4 characterized by these.

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