JP2008122260A - Surface flaw inspection device of extremely fine and long cylindrical metal wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a surface flaw inspection device of an extremely fine and long cylindrical metal wire stabilized in its inspection precision by automatically inspecting the surface flaw of the extremely fine and long cylindrical metal wire. <P>SOLUTION: The half 1a in the axial direction of the extremely fine and long cylindrical metal wire 1 is inserted in the hole 51 of a first conical mirror 5 by predetermined distance using first and second guide hands 2 and 3 in a first station 10 and the image of the first conical mirror 5 is taken in the image intake device 71 of a first CCD camera 7 as an image by predetermined distance in a first station 10. Thereafter, the residual half 1b in the axial direction of the cylindrical metal wire 1 is inserted in the hole 61 of a second conical mirror 6 by the predetermined distance using second and third guide hands 3 and 4 and the image of the second conical mirror 6 is taken in the image intake device 71 of a second CCD camera 8 as an image by predetermined distance. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a surface flaw inspection apparatus for an extremely thin and long cylindrical metal wire such as a straight drill material of about φ1.0.

An extremely thin and long cylindrical metal wire such as a conventional straight drill material may inadvertently scratch in the pre-hardened manufacturing process. In order to prevent the outflow of defects, a visual defect check is carried out by human visual inspection at the final stage of the process, but in human visual inspection, the inspection standard varies from person to person and is not stable. Also, sometimes scratches are overlooked. An image sensor method is effective as means for inspecting the surface of a cylindrical metal wire without damaging the surface. As a surface flaw inspection device for cylindrical objects by an image sensor using a conical mirror, those proposed in Patent Documents 1 and 2 are extremely thin and long cylinders such as a straight drill material with a workpiece of about φ1.0. In the case of a metal wire, even if it is viewed directly from the side with a camera, only a very small part can be seen due to the reflection of the illumination, and it cannot be used as a surface flaw inspection device for a long cylindrical metal wire. Therefore, as a possible means to cope with this, there are a method of capturing an image while rotating the workpiece, or a method of arranging a plurality of cameras radially from the center of the workpiece, but a more rational method is a general two-dimensional method. Instead of using a CCD camera, a method using a one-dimensional CCD called a line sensor can be considered. In such a method, since the CCD elements are arranged in a line in a line sensor, the line sensor is suitable for an application in which the ratio of the amount of information in the vertical and horizontal directions is greatly different, such as an elongated workpiece as in the present object. In this case, the line sensor is arranged in parallel to the longitudinal direction of the workpiece to read one line data for the entire length, and then the workpiece is rotated by one line image and one line data is read again. The entire circumference data can be read by repeating this for one revolution, but the disadvantages of this method are that the line sensor is more expensive than the two-dimensional CCD, the precision of the work rotation mechanism is required, and the image data The take-in timing needs to be synchronized with the rotational position of the workpiece, so that a position detection function is required and the cost is further increased.
JP 2004-163426 A JP-A-2005-37203

  The object of the present invention is to automate the surface flaw inspection of an ultrathin and long cylindrical metal wire that solves the conventional problem, and to provide a surface flaw inspection apparatus for an ultrathin and long cylindrical metal wire that stabilizes the inspection accuracy at a low cost. There is to provide to.

For this reason, the present invention is a surface flaw inspection device for an extremely thin and long cylindrical metal wire,
A first station for inspecting a surface flaw on the axial half of the cylindrical metal wire and a second station for inspecting a surface flaw on the remaining half of the cylindrical metal wire in the axial direction;
The first station is arranged to be opposed to the first and second guide hands, which are supported so as to be movable in the Y-axis direction and can hold the cylindrical metal wire, and the first and second guide hands. A first conical mirror having a hole for inserting the cylindrical metal wire, and a first CCD camera arranged to face the first conical mirror and inspecting a surface flaw on the half of the axial direction of the cylindrical metal wire. Have
The second station is a third guide hand and a third guide which are supported so as to be movable in the Y-axis direction and which are arranged symmetrically with respect to the first station, and which can hold a cylindrical metal wire. A second conical mirror having a hole for inserting the cylindrical metal wire arranged facing the hand and a surface flaw of the remaining half of the cylindrical metal wire in the axial direction arranged facing the second conical mirror. Have a second CCD camera to inspect,
The first guide hand is supported so as to be movable in the X-axis direction between a gripping station for gripping the cylindrical metal wire and the first station, and the second guide hand is supported by the first station and the first station. The third guide hand is supported so as to be movable in the X-axis direction between the second station and the dispensing station for paying out the cylindrical metal wire. And
Each of the first and second CCD cameras has an image capturing device that captures images of the first and second conical mirrors as images at the center, and an illumination light source disposed around each center, and the cylindrical shape After the metal wire is moved from the gripping station to the first station by the first guide hand, the metal wire is gripped together with the second guide hand, and the axial half of the metal wire is moved a predetermined distance into the hole of the first conical mirror. Insert the image of the first conical mirror as an image into the image capturing device of the first CCD camera at a predetermined distance,
Thereafter, the first and second guide hands pull out the cylindrical metal wire from the hole of the first conical mirror, the first guide hand moves backward in the Y-axis direction, and the second guide hand pulls the cylindrical metal wire. Grip and move to the second station in the X-axis direction,
The third guide hand holds the cylindrical metal wire together with the second guide hand and inserts the remaining half of the axial direction into the hole of the second conical mirror at a predetermined distance, and the second CCD at a predetermined distance. The image capture device of the camera captures the image of the second conical mirror as an image,
Thereafter, the second and third guide hands pull out the cylindrical metal wire from the hole of the second conical mirror, the second guide hand moves backward in the Y-axis direction, and the third guide hand pulls the cylindrical metal wire. The book described above by the surface defect inspection device for an extremely thin and long cylindrical metal wire, which is gripped and moved from the second station to the discharge station in the X-axis direction to discharge the cylindrical metal wire. Solved the problem of the invention.

  In the present invention, the cylindrical metal wire is inserted into the hole of the first conical mirror at a predetermined distance by the first and second guide hands at a first station at a predetermined distance, and the first CCD camera of the first CCD camera at a predetermined distance. The image capture device captures the image of the first conical mirror as an image, and then the cylindrical metal wire moves the remaining half of the axial direction into the hole of the second conical mirror by a predetermined distance with the second and third guide hands. Since the image of the second conical mirror is captured as an image into the image capturing device of the second CCD camera at a predetermined distance, the image of the entire surface is captured in the same posture over the entire surface of the extremely long and thin cylindrical metal wire. The surface defect inspection device for ultra-thin and long cylindrical metal wire with stable inspection accuracy can be provided at low cost by automating the surface defect inspection of ultra-fine and long cylindrical metal wire. .

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic plan block diagram showing the entire surface defect inspection apparatus for an ultrathin and long cylindrical metal wire according to an embodiment of the present invention. FIG. 2A is a first (and second) conical mirror of FIG. FIG. 1B is a detailed schematic plan block diagram of the first (and second) CCD camera, and FIG. 4B is a donut at the camera focal position on the outer periphery of the cylindrical metal wire received by the first (and second) CCD camera. (C) is a schematic enlarged view of an image of a ring, (c) is a half of the axial direction of a cylindrical metal wire held together by a first and a second guide hand in the first station of (a) and into the hole of the first conical mirror. FIG. 3 to FIG. 5 are plan views showing a state in which an image of the first conical mirror is taken as an image into the image capturing device of the first CCD camera at predetermined distances, and FIGS. 3 to 5 are operations of the inspection device of FIG. A schematic plan view showing the order is shown.

  As shown in FIG. 1 and FIG. 2, the surface flaw inspection apparatus for an ultrathin and long cylindrical metal wire according to the embodiment of the present invention has a surface flaw of the axial half of the cylindrical metal wire 1 (FIG. 2 (c) 1a). It consists of a first station 10 for inspecting and a second station 20 for inspecting the surface half of the cylindrical metal wire 1 in the other half (FIG. 2 (c) 1b). The first station 10 is in the Y-axis direction. The first and second guide hands 2 and 3 which are supported so as to be movable and can hold the cylindrical metal wire 1, and the cylindrical shape which is arranged opposite to the first and second guide hands 2 and 3 A first CCD 5 having a hole 51 for inserting a metal wire 1 and a first CCD for inspecting a surface flaw on the axial half 1a of the cylindrical metal wire 1 arranged opposite to the first cone mirror 5 The second station 20 is arranged in point symmetry with respect to the first station 10. A third guide hand 4 supported so as to be movable in the axial direction and capable of gripping the cylindrical metal wire 1, a hole 61 for inserting the cylindrical metal wire 1 arranged facing the third guide hand 4 The second conical mirror 6 having the second conical mirror 6 and the second CCD camera 8 which is disposed to face the second conical mirror 6 and inspects the surface flaw of the remaining half 1b in the axial direction of the cylindrical metal wire 1 are provided. The inside of the first and second conical mirrors 5 and 6 has a cone-like shape, the surface is a mirror surface with a coating, and the central part has punch holes 51 and 61. From the back side, a cylindrical metal wire 1 can enter horizontally. The first and second CCD cameras 7 and 8 are arranged on the central axes of the first and second conical mirrors 5 and 6.

  The first guide hand 2 is supported so as to be movable in the X-axis direction by a device (not shown) between the gripping station 30 for gripping the cylindrical metal wire 1 and the first station 10, and the second guide hand 3 is the first guide hand 3. The third guide hand 4 is supported between the station 10 and the second station 20 so as to be movable in the X-axis direction by a device (not shown), and the third guide hand 4 is provided between the second station 20 and the dispensing station 40 for dispensing the cylindrical metal wire 1. The first and second CCD cameras 7 and 8 support the images of the first and second conical mirrors 5 and 6 in the center according to the optical path 9 respectively. An image capturing device 71 that captures an image and an illumination light source 72 disposed around each central portion are included.

  After the cylindrical metal wire 1 is moved from the gripping station 30 to the first station 10 by the first guide hand 2, it is gripped together with the second guide hand 3 and placed in the hole 51 of the first conical mirror 5. The axial half 1a is inserted by a predetermined distance, and the image of the first conical mirror 5 is captured as an image into the image capturing device 71 of the first CCD camera 5 by a predetermined distance, and then the first and second guide hands 2 and 3 pull out the cylindrical metal wire 1 from the hole 51 of the first conical mirror 5, the first guide hand 2 retracts to 2 a in the Y-axis direction, and the second guide hand 3 pulls the cylindrical metal wire 1 The third guide hand 4 grips the cylindrical metal wire together with the second guide hand 3 to move the second conical mirror 6 to the position 3 of the second station 20. Insert the remaining half 1b of the axial direction into the hole 61 at a predetermined distance, and then the second CCD at a predetermined distance. The image of the second conical mirror 6 is captured as an image in the image capturing device of the mela 8, and then the second and third guide hands 3 and 4 are inserted into the cylindrical metal wire 1 from the hole 61 of the second conical mirror 6. The second guide hand 3 is retracted in the Y-axis direction and the third guide hand 4 grips the cylindrical metal wire 1 and moves from the second station 20 to the dispensing station 40 to the position 4b in the X-axis direction. 4b, pay off cylindrical metal wire 1 and finish the work.

  An image of the cylindrical surface of the cylindrical metal wire 1 in the axial direction half 1a is reflected on the first and second conical mirrors 5 and 6 according to the optical path 9 (FIG. Each of the first and second CCD cameras 7 and 8 is captured by the central image capturing device 71. Basically, an image of the cylindrical surface of the cylindrical metal wire 1 in the axial direction half 1a is acquired as data of a donut-shaped image (FIG. 2 (b)) at the focal position of the CCD cameras 7 and 8 on the outer periphery. become. Therefore, in order to obtain information on the entire area of the cylindrical metal wire 1, it is necessary to infiltrate the cylindrical metal wire 1 and sequentially acquire data while changing the position. If the cylindrical metal wire 1 is gradually advanced by a predetermined distance and images are sequentially captured in synchronization with the position, the entire outer periphery can be captured. The image that can be captured at one time is within the range that the depth of focus of the optical system can cover (depending on the optical system, about 2 to 3 mm). As for the movement, first, when the end of the work reaches the image capture position, the work is stopped and the first image capture is performed. The image that can be captured in this way is a donut-shaped image as shown in FIG. After that, the workpiece is further advanced by a length corresponding to the depth of focus. Therefore, the second image capture is performed again. Then the work is made to enter again. This is repeated until the entire work outer periphery can be covered. Whether or not there is rust on the workpiece surface from the captured image is determined using image processing technology such as matching.

  In order to effectively enter the cylindrical metal wire 1 into the conical mirrors 5 and 6, guide hands 2 and 3 as shown in FIG. Guide hands 2 and 3 are opened and closed by a cylinder (not shown), and the opening and closing strokes are both about 1 mm. If it is closed, the cylindrical metal wire 1 is gripped, and if it is opened, it is configured to have a clearance of about 0.2 mm with the cylindrical metal wire 1. The guide hands 2 and 3 are placed on the linear drive stages 21 and 31, and the cylindrical metal wire 1 is conveyed in the Y-axis direction.

The operation sequence of the inspection apparatus of FIG. 1 will be described with reference to FIGS. In each drawing, the first and second CCD cameras 7 and 8 are omitted.
In FIG. 3A, in the first station 10, the cylindrical metal wire 1 is moved from the gripping station 30 to the first station 10 with the first guide hand 2. In the second station 20, the second and third guide hands 3 and 4 draw the cylindrical metal wire 1 from the hole 61 of the second conical mirror 6, and the second guide hand 3 moves backward in the Y-axis direction.
In FIG. 3B, the first guide hand 2 is positioned at the first station 10 while holding the cylindrical metal wire 1, and at the second station 20, the second guide hand 3 is retracted in the Y-axis direction. The third guide hand 4 holding the cylindrical metal wire 1 is moved to the dispensing station 40 in the X-axis direction.
In FIG. 3 (c), the second guide hand 3 is returned to the first station 10 in the X-axis direction, and in the second station 20, the third guide hand 4 holding the cylindrical metal wire 1 is transferred to the dispensing station 40. Position and take out the cylindrical metal wire 1.
In FIG. 3 (d), at the first station 10, the cylindrical metal wire 1 is gripped together with the second guide hand 3, and the axial half 1a thereof is placed in the hole 51 of the first conical mirror 5 by a predetermined distance. The image of the first conical mirror 5 is captured as an image into the image capturing device 71 of the first CCD camera 5 at a predetermined distance, and the third guide hand 4 is returned to the second station 20 at the second station 20. It is.

In FIG. 4 (e), in the first station 10, the first and second guide hands 2, 3 pull out the cylindrical metal wire 1 from the hole 51 of the first conical mirror 5, and the first guide hand 2 is Move backward 2a in the Y-axis direction.
In FIG. 4 (f), in the first station 10, the second guide hand 3 b grips the cylindrical metal wire 1 and moves to the second station 20 in the X-axis direction.
In FIG. 4G, in the first station 10, the first guide hand 2 is moved to the gripping station 30 in the X-axis direction, and in the second station 20, the second guide hand 3 grips the cylindrical metal wire. Then, it moves in the Y-axis direction toward the second conical mirror 6 and the remaining half 1b in the axial direction is inserted into the hole 61 of the second conical mirror 6 by a predetermined distance, and the second CCD camera 8 is moved by a predetermined distance. The image of the second conical mirror 6 is captured as an image in the image capturing device of FIG.
In FIG. 4 (h), at the first station 10, the first guide hand 2 grips the cylindrical metal wire at the gripping station 30. At the second station 20, the second and third guide hands 4, 3 pull out the cylindrical metal wire 1 from the hole 61 of the second conical mirror 6.

In FIG. 5 (i), in the first station 10, the first guide hand 2 is moved to the first station 10 in the X-axis direction by the grip station 30 gripping the cylindrical metal wire 1. At the second station 20, the second guide hand 3 moves backward in the Y-axis direction.
In FIG. 5 (j), in the first station 10, the first guide hand 2 grips the cylindrical metal wire and is positioned at the first station 10, and in the second station 20, the third guide hand 4 is a cylinder. The metal wire 1 is gripped and moved to the dispensing station 40 in the X-axis direction.
In FIG. 5 (k), at the first station 10, the second guide hand 3 is returned to the first station 10, and at the second station 20, the third guide hand 4 discharges the cylindrical metal wire 1 from the discharge station 40. Finish the work by paying 1 cylindrical metal wire.
With the above-described movement, the first station 10 sequentially captures the half of the longitudinal piece of the cylindrical metal wire 1 and the second station 20 sequentially captures the remaining half of the longitudinal piece of the cylindrical metal wire 1.

  In the surface flaw inspection apparatus for an extremely long and long cylindrical metal wire according to the embodiment of the present invention, the cylindrical metal wire is half of its axial direction into the hole of the first conical mirror with the first and second guide hands at the first station. Are inserted at predetermined distances, and an image of the first conical mirror is captured as an image into the image capturing device of the first CCD camera at predetermined distances. Thereafter, the cylindrical metal wire is inserted into the second guide hand with the second and third guide hands. The other half of the axial direction is inserted into the hole of the second conical mirror at a predetermined distance, and the image of the second conical mirror is captured as an image into the image capturing device of the second CCD camera at a predetermined distance. An image of the entire surface can be captured in the same posture over the entire surface of the long cylindrical metal wire, and the surface of the extremely long and long cylindrical metal wire is automatically inspected for flaws. Metal wire surface It not has become a thing be provided at a low cost an inspection apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan block diagram showing the entire surface flaw inspection apparatus for an extremely thin and long cylindrical metal wire according to an embodiment of the present invention. (A) is a detailed schematic plan block diagram of the first (and second) conical mirror and the first (and second) CCD camera of FIG. 1, and (b) is (a) first (and second) of FIG. FIG. 4C is a schematic enlarged view of a donut-shaped image at the camera focal position on the outer periphery of the cylindrical metal wire received by the CCD camera, and FIG. 5C is a first and second guide for the cylindrical metal wire at the first station in FIG. Grasping together with hands, inserting half of the axial direction into the hole of the first conical mirror at a predetermined distance, and capturing the image of the first conical mirror as an image into the image capturing device of the first CCD camera at a predetermined distance FIG. The schematic plan view which shows the operation | movement order of the inspection apparatus of FIG. The schematic plan view which shows the operation | movement order of the inspection apparatus of FIG. The schematic plan view which shows the operation | movement order of the inspection apparatus of FIG.

Explanation of symbols

1: cylindrical metal wire, 1a: axial half of cylindrical metal wire, 1b: remaining axial half of cylindrical metal wire, 2,2a, 2b: first guide hand, 3,3a, 3b: second 4, 4a, 4b: third guide hand, 5: first conical mirror, 6: second conical mirror, 7: first CCD camera, 8: second CCD camera, 10: 1st station, 20: 2nd station, 30: Grasping station, 51: Hole of the first conical mirror, 61: Hole of the 2nd conical mirror 6, 71: Image capturing device

Claims (1)

An ultra-fine and long cylindrical metal wire surface flaw inspection device,
A first station for inspecting a surface flaw on the axial half of the cylindrical metal wire and a second station for inspecting a surface flaw on the remaining half of the cylindrical metal wire in the axial direction;
The first station is arranged to be opposed to the first and second guide hands, which are supported so as to be movable in the Y-axis direction and can hold the cylindrical metal wire, and the first and second guide hands. A first conical mirror having a hole for inserting the cylindrical metal wire, and a first CCD camera arranged to face the first conical mirror and inspecting a surface flaw on the half of the axial direction of the cylindrical metal wire. Have
The second station is a third guide hand and a third guide which are supported so as to be movable in the Y-axis direction and which are arranged symmetrically with respect to the first station, and which can hold a cylindrical metal wire. A second conical mirror having a hole for inserting the cylindrical metal wire arranged facing the hand and a surface flaw of the remaining half of the cylindrical metal wire in the axial direction arranged facing the second conical mirror. Have a second CCD camera to inspect,
The first guide hand is supported so as to be movable in the X-axis direction between a gripping station for gripping the cylindrical metal wire and the first station, and the second guide hand is supported by the first station and the first station. The third guide hand is supported so as to be movable in the X-axis direction between the second station and the dispensing station for paying out the cylindrical metal wire. And
Each of the first and second CCD cameras has an image capturing device that captures images of the first and second conical mirrors as images at the center, and an illumination light source disposed around each center, and the cylindrical shape After the metal wire is moved from the gripping station to the first station by the first guide hand, the metal wire is gripped together with the second guide hand, and the axial half of the metal wire is moved a predetermined distance into the hole of the first conical mirror. Insert the image of the first conical mirror as an image into the image capturing device of the first CCD camera at a predetermined distance,
Thereafter, the first and second guide hands pull out the cylindrical metal wire from the hole of the first conical mirror, the first guide hand moves backward in the Y-axis direction, and the second guide hand pulls the cylindrical metal wire. Grip and move to the second station in the X-axis direction,
The third guide hand holds the cylindrical metal wire together with the second guide hand and inserts the remaining half of the axial direction into the hole of the second conical mirror at a predetermined distance, and the second CCD at a predetermined distance. The image capture device of the camera captures the image of the second conical mirror as an image,
Thereafter, the second and third guide hands pull out the cylindrical metal wire from the hole of the second conical mirror, the second guide hand moves backward in the Y-axis direction, and the third guide hand pulls the cylindrical metal wire. An apparatus for inspecting a surface flaw of an extremely thin and long cylindrical metal wire, wherein the device is moved in the X-axis direction from the second station to the payout station to pay out the cylindrical metal wire.

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