JP2008185356A - Round rod inspection device and round rod inspection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a round rod inspection device capable of easily detecting the flaw or the like of the outer peripheral surface of a round rod by a simple device only consisting of a light source and a light detection sensor, and to provide a round rod inspection method. <P>SOLUTION: The round rod inspection device is equipped with the light source for irradiating the outer peripheral surface of the round rod with light almost vertically with respect to the axis of the round rod and the light detection sensor provided so that its angle formed with the incident direction of the light source in the axis of the round rod is above 90° to below 180°. The reflected light from the outer peripheral surface of the round rod of the light from the light source is detected by the light detection source and the outer peripheral surface of the round rod is inspected from the level of the detected light. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a round bar inspection apparatus and a round bar inspection method for inspecting wrinkles and dirt on the outer peripheral surface of a round bar.

Conventionally, inspection of wrinkles and dirt on the outer peripheral surface of a round bar such as a long steel material manufactured by rolling or the like has been performed. An example of this round bar inspection apparatus is shown in Patent Document 1. In the round bar inspection apparatus of Patent Document 1, the round bar is magnetized, and when the round bar is magnetized, a magnetic pole is generated on the surface of the round bar. The degree of wrinkles is determined by the degree. Specifically, the powder exhibits a pattern reflecting the shape of the surface wrinkles, the pattern is measured with an image sensor such as a CCD element, the pattern is analyzed by a method according to image processing, and the degree of wrinkles is determined. Yes.
JP 2005-134177 A

  However, in the conventional round bar inspection apparatus, the apparatus is complicated and expensive, such as magnetizing the round bar or applying image processing. There is also a problem that a round bar that cannot be magnetized cannot be inspected.

  The present invention has been made in view of such circumstances, and a round bar inspection apparatus and a round bar inspection that can easily detect wrinkles on the outer peripheral surface of a round bar with a simple device including only a light source and a light receiving sensor. It is to provide a method.

  The round bar inspection apparatus according to claim 1 includes a light source that irradiates light to the outer peripheral surface substantially perpendicularly to the axis of the round bar and an incident direction of the light source on the axis of the round bar in a cross-sectional view of the round bar. And a light receiving sensor provided so that the angle is more than 90 degrees and less than 180 degrees, the light reflected from the outer peripheral surface of the light from the light source is received by the light receiving sensor, and the outer peripheral surface is inspected from the level of the received light It is characterized by doing.

  The round bar inspection apparatus according to claim 2 is characterized in that the angle formed between the incident direction of the light source on the axis of the round bar and the light receiving sensor is about 130 degrees to about 170 degrees.

  According to a third aspect of the present invention, the round bar inspection apparatus inspects wrinkles and dirt on the outer peripheral surface of the round bar by displacement of the level of light received by the light receiving sensor.

  The round bar inspection apparatus according to claim 4 is characterized in that the light source is a light emitting diode.

  The round bar inspection apparatus according to claim 5 is characterized in that the light receiving sensor is a photodiode.

  The round bar inspection method according to claim 6 irradiates the outer peripheral surface with light substantially perpendicular to the axis of the round bar, and the angle formed by the incident direction of the light source on the axis of the round bar is an obtuse angle in a cross-sectional view of the round bar. The light receiving sensor provided so as to receive light reflected from the outer peripheral surface of the light from the light source and inspect the outer peripheral surface from the level of the received light.

  According to the first aspect of the present invention, the light receiving sensor is provided so that the angle formed by the light source incident direction on the axis of the round bar is greater than 90 degrees and less than 180 degrees in the axial cross-sectional view of the round bar. The light reflected from the outer peripheral surface of the light from the light source is received by the light receiving sensor, and the outer peripheral surface is inspected from the level of the received light. Can be detected.

  According to the invention of claim 2, since the angle formed between the incident direction of the light source and the light receiving sensor on the axis of the round bar is about 130 degrees to about 170 degrees, the sensitivity to wrinkles and the like is improved. It is possible to detect wrinkles on the outer peripheral surface of the round bar with high accuracy.

  According to the invention of claim 3, since the wrinkles and dirt on the outer peripheral surface of the round bar are inspected by the displacement of the light level received by the light receiving sensor, It is possible to suppress wrinkles on the outer peripheral surface of the round bar with higher accuracy by suppressing the influence of the change in the overall light amount.

  According to the invention of claim 4, since the light source is a light emitting diode, it is not necessary to focus light with a round bar, and it is easy to irradiate the round bar with light.

  According to the invention of claim 5, since the light receiving sensor is a photodiode, the cost of the present apparatus can be suppressed.

  According to the invention of claim 6, the outer peripheral surface is irradiated with light substantially perpendicular to the axis of the round bar so that the angle formed by the incident direction of the light source on the axis of the round bar becomes an obtuse angle in the sectional view of the axis of the round bar. The light receiving sensor provided on the light source receives the reflected light on the outer peripheral surface of the light from the light source, and inspects the outer peripheral surface from the level of the received light. It is possible to detect wrinkles on the outer peripheral surface of the rod.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a block diagram showing an example of a round bar inspection apparatus according to the present invention. FIG. 2 is an explanatory diagram showing details of the configuration of the same round bar inspection apparatus. FIG. 3 is an explanatory view showing the operation of the round bar inspection apparatus. FIG. 4 is an explanatory diagram showing details of the operation of the round bar inspection apparatus.

  A round bar inspection apparatus 1 in the figure is an apparatus for inspecting wrinkles and dirt on the outer peripheral surface of a round bar w to determine the presence or absence of wrinkles. The round bar inspection apparatus 1 has cylindrical cylindrical guide cylinders 7 and 8 through which a round bar w passes, and bearing bases 5 and 6 that rotatably support the guide cylinders 7 and 8 respectively. It is equipped in parallel to become. A rotating base 10 having two discs arranged in parallel with a predetermined gap is provided between the opposite ends of the guide cylinders 7 and 8. The center of rotation of the disk of the rotation base 10 (the center of the disk) is the same axis as the rotation axis of the guide cylinders 7 and 8, and a hole through which the round bar w can pass is formed in the center of the disk. . The round bar inspection apparatus 1 is configured such that the round bar w can pass through the rotation centers of the guide cylinders 7 and 8 and the rotary base 10.

  The rotating base 10 has a light emitting diode 20 that is a light source that is held by the substrate 21 and irradiates light toward the outer peripheral surface of the round bar w, and the light of the light emitting diode 20 that is held by the element support unit 27 is round bar w. The photodiode 25 is a light receiving sensor that receives the reflected light reflected by the outer peripheral surface of the light, the condensing lens 26 that condenses the reflected light toward the photodiode 25, and the light from the light emitting diode 20 does not directly enter the photodiode 25. The light shielding plate 15 is provided. The light emitting diode 20 is disposed at a position where light strikes the outer peripheral surface of the round bar w substantially perpendicular to the axis of the round bar w. In addition, the photodiode 25 has an angle (each θ in FIG. 2) of more than 90 degrees and less than 180 degrees with the incident direction of light from the light emitting diode 20 on the axis of the round bar w in the axial cross-sectional view of the round bar w. It is arranged to be. The rotating base 10 including the guide cylinders 7 and 8 is rotated by a rotating means (not shown) so that the arrangement of the round bar w, the light emitting diode 20 and the photodiode 25 is maintained. The light-emitting diode 20, the photodiode 25, and the light-shielding plate 15 are rotated outside.

  As shown in FIG. 2, a stabilized power supply 22 is connected to the light emitting diode 20 to emit light. The photodiode 25 is connected to a data analysis unit 30 that processes the level of received light output from the photodiode 25 and determines the presence or absence of wrinkles.

  The operation of the round bar inspection apparatus 1 configured as described above will be described with reference to FIGS. 3 and 4, the cross section of the round bar w is shown larger than that of the condenser lens 26 and the photodiode 25, but this is for the purpose of emphasizing the round bar w. Actually, the thickness is such that the reflected light near the ridge of the round bar w reaches the photodiode 25. That is, as shown in FIG. 3A, the illumination light from the light emitting diode 20 is reflected by the outer peripheral surface of the round bar w, and the reflected light is collected by the condenser lens 26 and enters the photodiode 25. As shown in FIG. 3B, the level of the reflected light captured by the photodiode 25 is substantially constant (baseline level) if there is no wrinkle or the like. Decrease and decrease by the level corresponding to the wrinkles. By detecting this decrease in the amount of reflected light by the data analysis unit 30, it is possible to inspect the wrinkles of the round bar w. Although the baseline level of the reflected light is almost stable but slightly fluctuated, a moving average of the levels may be performed so that only a decrease in the amount of reflected light can be appropriately determined.

  If the angle θ is different as shown in FIG. 4 (a) (in the case of FIG. 4, about 90 ° and about 150 ° are exemplified), the observation area is different as shown in FIG. 4 (b) depending on the angle. come. Specifically, the observation area is narrower at about 150 ° than at about 90 °. When the observation area is different, as shown in FIG. 4C, the level of reflected light (baseline level) is also different (in the case of about 90 ° = m, in the case of about 150 ° = m ′). When the observation area is narrow (when the angle θ is large), the reflected light level (baseline level) is small, and when it is wide (when the angle θ is small), the reflected light level (baseline level) is large. On the other hand, the decrease in the amount of reflected light (v, v ′) due to wrinkles is almost the same. Therefore, when the ratio of v ′ and m ′ (displacement: v ′ / m ′) is compared with the ratio of v and m (displacement: v / m), v ′ / m ′ is more drastic. It shows a sensitive reaction (improves sensitivity). For this reason, about 150 degrees is preferable as angle (theta) compared with about 90 degrees. Considering this point, inspection such as wrinkles is possible if the angle θ is more than 90 degrees and less than 180 degrees, but a range of about 130 degrees to about 170 degrees is preferable.

  Although it is possible to judge from the absolute value of the amount of reflected light reduction due to wrinkles, considering that the level of reflected light (baseline level) varies depending on the angle θ, the level of reduction in reflected light amount (baseline level) It is preferable to use a displacement with respect to.

  As described above, according to the round bar inspection apparatus 1 of the present embodiment, the light reflected from the outer peripheral surface of the light emitting diode 20 is received by the photodiode 25, and the outer peripheral surface is inspected from the level of the received light. Therefore, wrinkles and the like on the outer peripheral surface of the round bar w can be easily detected with a simple device including only the light emitting diode 20 and the photodiode 25. In addition, since the round bar inspection apparatus 1 according to the present embodiment performs a non-contact test, the round bar inspection apparatus 1 is not easily affected by the shaking or vibration of the round bar w. As an example of the thickness of the round bar w, for example, a round bar having a diameter of about 1 mm to about 3 mm and a wrinkle having a width of about 0.1 mm to about 0.5 mm can be detected.

  Further, since the wrinkles and dirt on the outer peripheral surface of the round bar w are inspected by the displacement of the light level received by the photodiode 25, the change in the light level regardless of the wrinkle to be detected or the overall light amount It is possible to suppress wrinkles on the outer peripheral surface of the round bar w with higher accuracy by suppressing the influence of the change. Furthermore, since the light receiving sensor is the photodiode 25, the cost of the present apparatus can be reduced.

  In the present embodiment, the light emitting diode 20 and the photodiode 25 are rotated around the round bar w to enable inspection of the entire circumference of the round bar w. However, the light emitting diode 20 and the photodiode 25 are fixed, and the round bar is fixed. It is also possible to inspect the entire circumference by rotating w. However, in the case of a round bar that is long and difficult to rotate itself, such as a wire rod, it is preferable that the light emitting diode 20 and the photodiode 25 rotate.

  In addition, a laser light source can be used as a light source, but in the case of a laser light source, it is necessary to focus the laser light with a round bar, and the light source itself is expensive and has a complicated structure. It is easy to irradiate the bar w with light.

  The round bar w that can be inspected may be not only metal but also resin or the like, and can be widely inspected as long as the material reflects light on the outer peripheral surface. Further, the thickness and length of the round bar w are not limited, and can be appropriately inspected by adjusting the distance between the round bar w and the light emitting diode 20, the photodiode 25, and the like. Furthermore, the cross-sectional shape of the round bar w is only required to have a curvature capable of forming a reflection angle at which the reflected light can reach the photodiode 25, and may be not only a perfect circle but also an ellipse or a distorted shape. .

  As described above, according to the present invention, there is provided a round bar inspection device and a round bar inspection method capable of easily detecting wrinkles on the outer peripheral surface of a round bar with a simple device including only a light source and a light receiving sensor. Can do.

It is a block diagram which shows an example of the round bar inspection apparatus which concerns on this invention. It is explanatory drawing which shows the detail of a structure of the same round bar inspection apparatus. It is explanatory drawing which shows operation | movement of the same round bar inspection apparatus. It is explanatory drawing which shows the detail of operation | movement of the same round bar inspection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Round bar inspection apparatus 5 ... Bearing base 6 ... Bearing base 7 ... Guide tube 8 ... Guide tube 10 ... Rotating base 15 ... Light-shielding plate 20 ... Light-emitting diode 21 ... Substrate 22 ... Stabilizing power supply 25 ... Photodiode 26 ... Condensing lens 27 ... Element support part 30 ... Data analysis part W ... ··Round bar

Claims (6)

In the round bar inspection device that inspects the outer surface of the round bar for wrinkles and dirt,
A light source that irradiates light to the outer peripheral surface substantially perpendicular to the axis of the round bar;
A light receiving sensor provided so that an angle formed by an axis of the round bar and an incident direction of the light source is greater than 90 degrees and less than 180 degrees in an axial cross-sectional view of the round bar;
A round bar inspection apparatus characterized in that light reflected from the outer peripheral surface of light from the light source is received by the light receiving sensor, and the outer peripheral surface is inspected from the level of the received light.   The round bar inspection apparatus according to claim 1, wherein an angle formed between the incident direction of the light source on the axis of the round bar and the light receiving sensor is about 130 degrees to about 170 degrees.   The round bar inspection apparatus according to claim 1 or 2, wherein wrinkles, dirt, or the like on the outer peripheral surface of the round bar is inspected by displacement of a level of light received by the light receiving sensor.   The said light source is a light emitting diode, The round bar inspection apparatus in any one of Claims 1-3 characterized by the above-mentioned.   The round bar inspection apparatus according to claim 1, wherein the light receiving sensor is a photodiode. In the round bar inspection method for inspecting wrinkles and dirt on the outer peripheral surface of the round bar,
Irradiating the outer peripheral surface with light substantially perpendicular to the axis of the round bar;
A light receiving sensor provided so that an angle formed by an incident direction of the light source on the axis of the round bar is an obtuse angle in a cross-sectional view of the round bar, and reflects light from the light source on the outer peripheral surface. Receive light,
A round bar inspection method, wherein the outer peripheral surface is inspected from the level of the received light.

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