JP2022072650A - Method for detecting position of steel plate and target for detecting position of steel plate - Google Patents

Abstract

To detect the position of a steel plate by a simple configuration without damaging the steel plate.SOLUTION: The method for detecting the position of a steel plate includes: an arrangement step of arranging a plate-like target on a first surface of the steel plate; and a detection step of sending an ultrasonic sound from a probe to the inside of the steel plate while bringing the probe into contact with a second surface being the back side of the first surface of the steel plate and moving the probe along the second surface, receiving the reflected ultrasonic sound by the probe, and detecting the position of the target on the basis of the result of reception and the position of the probe on the second surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to a steel sheet position detection method and a steel sheet position detection target.

In the repair work of a steel sheet or the like, it may be required to detect the position of the steel sheet on the first surface side from the second surface side on the back side. For example, a method is known in which a recess is provided by a punch or the like with the position on the first surface side of the steel sheet as a designated stamping point, and the recess is detected from the second surface side (see, for example, Patent Document 1). Further, a method is known in which a probe for transmitting ultrasonic waves is installed at a position on the first surface side of a steel sheet, and the ultrasonic waves are detected from the second surface side to detect the position (for example, Patent Document). 2).

Japanese Unexamined Patent Publication No. 11-237232 Japanese Unexamined Patent Publication No. 2020-46214

In the method described in Patent Document 1, the first surface of the steel sheet is scratched. Further, in the method described in Patent Document 2, it is necessary to arrange a probe for transmitting ultrasonic waves on the first surface side of the steel sheet and arrange a probe for receiving ultrasonic waves on the second surface side. There is a probe required on both sides of the steel plate, which is a large scale.

The present invention has been made in view of the above, and provides a steel sheet position detecting method and a steel sheet position detecting target capable of detecting the position of a steel sheet with a simple configuration without damaging the steel sheet. With the goal.

In the steel plate position detection method according to the present invention, a plate-shaped target is placed on the first surface of the steel plate, and a probe is brought into contact with the second surface of the steel plate on the back side of the first surface. While moving along the second surface, ultrasonic waves are transmitted from the probe toward the inside of the steel sheet, and the reflected ultrasonic waves are received by the probe, and the reception result and the second. It includes a detection step of detecting the position of the target based on the position of the probe on the surface.

The target for detecting the position of the steel plate according to the present invention has a plate-shaped main body portion, a planar contact surface arranged on the main body portion and brought into contact with the first surface of the steel plate, and the back surface of the contact surface of the main body portion. A planar non-contact surface arranged on the side and a planar surface formed in a circular shape on the non-contact surface and capable of reflecting ultrasonic waves transmitted from the second surface on the back surface side of the first surface of the steel sheet. It also has a recess having a bottom surface parallel to the contact surface.

According to the present invention, the position of the steel sheet can be detected with a simple structure without damaging the steel sheet.

FIG. 1 is a flowchart showing an example of a steel plate position detection method according to the present embodiment. FIG. 2 is a diagram showing an example of an arrangement step. FIG. 3 is a diagram showing an example of a target. FIG. 4 is a diagram showing an example of a detection step. FIG. 5 is a diagram showing an example of a detection step. FIG. 6 is a diagram showing an example of a detection result in the detection step. FIG. 7 is a diagram for comparing the detection results shown in FIG. FIG. 8 is a diagram showing an example of the marking step. FIG. 9 is a diagram showing an example of the marking step. FIG. 10 is a diagram showing another example of the target.

Hereinafter, an embodiment of the steel plate position detection method and the steel plate position detection device according to the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

FIG. 1 is a flowchart showing an example of a steel plate position detection method according to the present embodiment. As shown in FIG. 1, the steel sheet position detecting method includes an arrangement step (S10), a detection step (S20), and a ruled writing step (S30).

In the arrangement step S10, a target having a recess is arranged on the first surface of the steel sheet. FIG. 2 is a diagram showing an example of an arrangement step. As shown in FIG. 2, in the arrangement step S10, the contact medium 13 is arranged on the first surface 11 of the steel sheet 10, and the target 20 is arranged on the contact medium 13. Since the target 20 is arranged on the first surface 11 of the steel sheet 10 via the contact medium 13, the attenuation of ultrasonic waves between the first surface 11 and the target 20 can be suppressed. The steel plate 10 may have a coating film formed on at least one of the first surface 11 and the second surface 12. Further, the steel plate 10 may have a structure in which a coating film is formed on both the first surface 11 and the second surface 12.

FIG. 3 is a diagram showing an example of the target 20. As shown in FIG. 3, the target 20 has a plate-shaped main body portion 20A. In the present embodiment, the case where the main body portion 20A has a disk shape will be described as an example, but the shape of the main body portion 20A is not limited to the disk shape. The main body 20A is formed by using a resin material such as polystyrene or acrylic. As the material of the main body 20A, for example, it is preferable to select a material having an acoustic impedance corresponding to that of the contact medium 13.

The target 20 (main body portion 20A) has a contact surface 21 that contacts the first surface 11 of the steel sheet 10 and a non-contact surface 22 that is arranged on the back side of the contact surface 21. The contact surface 21 contacts the first surface 11 via the contact medium 13 as described above. The contact surface 21 and the non-contact surface 22 are planar surfaces parallel to each other. The distance (thickness) of the target 20 from the contact surface 21 to the non-contact surface 22 is set to about several mm. Regarding the thickness of the target 20, for example, it is preferable that the detected position of the reflected wave on the non-contact surface 22 appears at about 3/4 of the detected position of the reflected wave on the first surface 11 of the steel sheet 10.

A recess 23 is provided in the center of the non-contact surface 22. The recess 23 is, for example, a circular groove in a plan view. In this embodiment, the radius of the recess 23 is r1. The recess 23 has a bottom surface 23a and a side surface 23b. The bottom surface 23a is parallel to the contact surface 21 and has a circular shape in a plan view. The side surface 23b has a cylindrical shape. In the recess 23, for example, the distance (depth) from the non-contact surface 22 to the bottom surface 23a is set to be about 3/4 of the thickness of the target 20. A cross mark (not shown) indicating the central portion of the target 20 in a plan view may be formed on the bottom surface 23a of the recess 23 of the contact surface 21 or the non-contact surface 22.

In the arrangement step S10 and the detection step S20 described later, the target 20 including the non-contact surface 22 is sealed or the liquid or the like is wiped so that the liquid such as the contact medium 13 does not adhere to the non-contact surface 22. To.

In the detection step S20, the probe 30 is brought into contact with the second surface 12 on the back side of the first surface 11 of the steel plate 10 and moved along the second surface 12 from the probe 30 to the inside of the steel plate 10. The ultrasonic wave is transmitted toward the target, and the reflected ultrasonic wave is received by the probe 30. Then, the position of the target 20 is detected based on the reception result and the position of the probe 30 on the second surface 12.

4 and 5 are diagrams showing an example of the detection step. 4 and 5 show an example in which the probe 30 is located at the first position P1, the second position P2, and the third position P3. The first position P1 is a position where the probe 30 does not overlap with the target 20 in a plan view. The second position P2 is a position where the probe 30 overlaps the target 20 in a plan view, but does not overlap the recess 23. The third position P3 is a position where the probe 30 overlaps the recess 23 of the target 20 in a plan view. The strength of the ultrasonic wave transmitted from the probe 30 can be appropriately set according to the thickness of the steel plate 10.

FIG. 6 is a diagram showing an example of a detection result in the detection step. The vertical axis of each graph shown in FIG. 6 shows the intensity of ultrasonic waves, and the horizontal axis shows the distance (sound velocity × time). When the probe 30 is arranged at the first position P1, as shown in FIG. 5, the ultrasonic component W1 reflected by the first surface 11 of the steel plate 10 and the ultrasonic wave reflected by the second surface 12 The component W2 of is detected.

When the probe 30 is arranged at the second position P2, the ultrasonic component W1 reflected by the first surface 11 of the steel plate 10, the ultrasonic component W2 reflected by the second surface 12, and the target 20. The ultrasonic component W3 reflected by the non-contact surface 22 of the above is detected.

When the probe 30 is arranged at the third position P3, the ultrasonic component W1 reflected by the first surface 11 of the steel plate 10, the ultrasonic component W2 reflected by the second surface 12, and the target 20. The component W4 reflected by the bottom surface 23a of the recess 23 is detected.

FIG. 7 is a diagram for comparing the detection results shown in FIG. The vertical axis of the graph shown in FIG. 7 shows the intensity of ultrasonic waves, and the horizontal axis shows the distance (sound velocity × time). As shown in FIG. 7, the component W1 reflected by the first surface 11 of the steel plate 10, the component W2 reflected by the second surface 12 of the steel plate 10, the component W3 reflected by the non-contact surface 22 of the target 20, and the target. The component W4 reflected by the bottom surface 23a of the recess 23 of 20 can be clearly distinguished and recognized.

Therefore, in the detection step S20, for example, the probe 30 is first scanned to find the position (second position P2) of the probe 30 in which the ultrasonic component W3 is detected. Next, when the component W3 is detected, the position of the probe 30 is finely adjusted to find the position of the probe 30 (third position P3) where the component W4 is detected. Then, when the component W4 is detected, it can be determined that the back surface side of the probe 30 at that time is the position of the target 20. By arranging the target 20 on the first surface 11 of the steel sheet 10 in this way, it is not necessary to separately install a device or the like on the first surface 11 side, and the position of the target 20 can be easily detected.

8 and 9 are diagrams showing an example of the marking step. In the ruled book step S30, as shown in FIGS. 8 and 9, in the ruled book step S30, after finding the position of the target 20 in the detection step S20, the probe receives the ultrasonic wave reflected by the bottom surface 23a of the recess 23. The position of 30 is marked on the second surface 12 of the steel plate 10.

In the ruled line step S30, it is preferable to make a ruled line on the second surface 12 in such a manner that the center position of the probe 30 can be determined. In the example shown in FIG. 8, a cross-shaped ruled line member 40 is arranged around the probe 30. The ruled line member 40 is formed so that the center position coincides with the center position of the probe 30. By performing the ruler along the outer circumference of the ruler member 40, the mark M1 having the four facing corners C is formed on the second surface 12. In this case, the intersection of the straight lines connecting the two diagonal corners is the center position S1 of the ruled line member 40, that is, the center position of the probe 30.

In the example shown in FIG. 9, a square ruled line member 50 is arranged around the probe 30. The ruled line member 50 has an opening 51 formed from four corners toward a central position along a diagonal line. By making a linear rule along the opening 51 of the ruler member 50, a mark M2 having four straight lines L toward the center position is formed on the second surface 12 in each opening 51. In this case, the intersection of the extension lines of the four straight lines L is the center position S2 of the ruled line member 50, that is, the center position of the probe 30.

As described above, in the steel plate position detection method according to the present embodiment, the arrangement step S10 in which the plate-shaped target 20 is arranged on the first surface 11 of the steel plate 10 and the second side of the back side of the first surface 11 of the steel plate 10 While the probe 30 is brought into contact with the two surfaces 12 and moved along the second surface 12, ultrasonic waves are transmitted from the probe 30 toward the inside of the steel plate 10, and the reflected ultrasonic waves are emitted by the probe. It includes a detection step S20 that receives by 30 and detects the position of the target 20 based on the reception result and the position of the probe 30 on the second surface 12.

Further, the steel plate position detection target (target 20) according to the present embodiment is arranged on the disk-shaped main body portion 20A and the main body portion 20A, and is in contact with the first surface 11 of the steel plate 10 in a planar contact surface 21. A flat non-contact surface 22 arranged on the back surface side of the contact surface 21 of the main body portion 20A, and a second surface on the back surface side of the first surface 11 of the steel plate 10 arranged in a circular shape on the non-contact surface 22. It is provided with a concave portion 23 having a flat surface capable of reflecting ultrasonic waves transmitted from the surface 12 and having a bottom surface parallel to the contact surface 21.

According to the present embodiment, the position of the target 20 is detected by transmitting ultrasonic waves from the second surface 12 side of the steel sheet 10 and receiving the ultrasonic waves reflected by the target 20 on the first surface 11. Therefore, the position on the first surface 11 of the steel plate 10 on which the target 20 is arranged can be easily detected. As a result, the position of the steel plate 10 can be detected with a simple structure without damaging the steel plate 10.

In the steel plate position detection method according to the present embodiment, the detection step S20 receives the ultrasonic waves reflected by the non-contact surface 22 arranged on the back surface side of the contact surface 21 in contact with the first surface 11 of the target 20. The position of the target 20 is detected based on the position of the probe 30. Therefore, the position of the target 20 can be easily detected by using the probe 30.

In the steel plate position detection method according to the present embodiment, the non-contact surface 22 has a concave portion 23 having a diameter corresponding to the probe 30 and having a flat bottom surface 23a parallel to the contact surface 21 in a circular shape in a plan view. The detection step S20, which is formed in a shape, detects the position of the target 20 based on the position of the probe 30 that has received the ultrasonic waves reflected by the bottom surface 23a of the recess 23. Therefore, the position of the target 20 can be detected with high accuracy.

In the steel plate position detection method according to the present embodiment, in the detection step S20, a probe 30 having a circular shape in a plan view and a target 20 having a recess 23 having the same or substantially the same diameter as the probe 30 are used. Send and receive ultrasonic waves. Therefore, the position of the target 20 can be detected with high accuracy by using the probe 30.

In the steel plate position detection method according to the present embodiment, the detection step S20 is performed by arranging the contact medium 13 between the probe 30 and the second surface 12. Therefore, since the attenuation of the ultrasonic wave between the steel plate 10 and the target 20 can be suppressed, the ultrasonic wave can be detected with high accuracy.

In the steel plate position detection method according to the present embodiment, after the position of the target 20 is obtained in the detection step S20, the position of the probe 30 that receives the ultrasonic wave reflected by the bottom surface 23a of the recess 23 is the position of the second steel plate 10. Further includes a ruled line step to make a ruled line on the surface 12. Therefore, the position on the second surface 12 corresponding to the target 20 arranged on the first surface 11 side of the steel plate 10 can be easily recorded on the second surface 12 without damaging the steel plate 10.

In the steel plate position detection method according to the present embodiment, the target 20 has a magnet portion 60 on the non-contact surface 22, and the arrangement step S10 arranges the target 20 on the first surface 11 to form a magnet portion 60. The contact surface 21 is pressed against the first surface 11 by the magnetic force attracted to the steel plate 10. Therefore, the misalignment of the target 20 can be suppressed.

The technical scope of the present invention is not limited to the above-described embodiment, and changes can be made as appropriate without departing from the spirit of the present invention.

FIG. 10 is a diagram showing another example of the target. As shown in FIG. 10, the target 120 has a main body portion 20A, a magnet portion 60, an acoustic blocking layer 70, and a sealing portion 80. The main body 20A has the same configuration as the main body 20A of the target 20 described above.

The magnet portion 60 is arranged on the non-contact surface 22 of the main body portion 20A. The magnet portion 60 is, for example, a columnar shape having the same diameter as the main body portion 20A. By providing the magnet portion 60, when the main body portion 20A is arranged on the first surface 11, a magnetic force attracting each other with the steel plate 10 is generated, and the contact surface 21 can be pressed against the first surface 11 by the magnetic force. can.

The acoustic blocking layer 70 is arranged between the non-contact surface 22 of the main body portion 20A and the magnet portion 60. The acoustic blocking layer 70 blocks ultrasonic waves between the non-contact surface 22 and the magnet portion 60. Therefore, it is possible to suppress a decrease in the reflectance of ultrasonic waves on the non-contact surface 22. As the acoustic blocking layer 70, for example, dry paper may be used, or an air layer may be used. When the acoustic blocking layer 70 is an air layer, the magnet portion 60 may be arranged so that a gap is formed between the acoustic blocking layer 70 and the non-contact surface 22, for example.

The sealing portion 80 suppresses the intrusion of the contact medium or the like into the non-contact surface 22 and the recess 23 of the main body portion 20A. The seal portion 80 is provided so as to cover the side surfaces of the main body portion 20A and the magnet portion 60. The seal portion 80 is arranged so as to straddle between the main body portion 20A and the magnet portion 60. As a result, the non-contact surface 22 and the recess 23 can be waterproofed, and the main body portion 20A, the magnet portion 60, and the acoustic blocking layer 70 can be integrated.

10 Steel plate 11 First surface 12 Second surface 13 Contact medium 20, 120 Target 20A Main body 21 Contact surface 22 Non-contact surface 23 Recessed surface 23a Bottom surface 23b Side surface 30 Detector 40, 50 Ruler member 51 Opening 60 Magnet part 70 Sound blocking layer 80 Seal part C Corner part L Straight line M1, M2 Mark P1 First position P2 Second position P3 Third position S1, S2 Center position W1, W2, W3, W4 Components

Claims (10)

An arrangement step for arranging a plate-shaped target on the first surface of a steel plate,
While the probe is brought into contact with the second surface of the steel sheet on the back side of the first surface and moved along the second surface, ultrasonic waves are transmitted from the probe toward the inside of the steel sheet. A steel sheet position detecting method including a detection step of receiving the reflected ultrasonic wave by the probe and detecting the position of the target based on the reception result and the position of the probe on the second surface. .. The detection step is based on the position of the probe that has received the ultrasonic waves reflected by the non-contact surface located on the back surface side of the contact surface that contacts the first surface of the target. The steel sheet position detection method according to claim 1. On the non-contact surface, a concave portion having a diameter corresponding to the probe and having a flat surface and a bottom surface parallel to the contact surface is formed in a circular shape in a plan view.
The steel plate position detection method according to claim 2, wherein the detection step detects the position of the target based on the position of the probe that receives the ultrasonic wave reflected by the bottom surface of the recess. The third aspect of the present invention, wherein in the detection step, the ultrasonic waves are transmitted and received by using the probe having a circular shape in a plan view and the target having the recess having the same or substantially the same diameter as the probe. Steel plate position detection method. The steel plate position detection method according to any one of claims 1 to 4, wherein the detection step is performed by arranging a contact medium between the probe and the second surface. Further included is a ruled step in which the position of the target is determined in the detection step, and then the position of the probe that receives the ultrasonic wave reflected by the bottom surface of the recess is marked on the second surface of the steel sheet. The steel sheet position detection method according to any one of claims 1 to 5. The target has a magnet portion on the non-contact surface and has a magnet portion.
The arrangement step is any one of claims 1 to 6, wherein by arranging the target on the first surface, the contact surface is pressed against the first surface by a magnetic force attracting the magnet portion and the steel plate. The method for detecting the position of a steel plate according to item 1. The plate-shaped body and
A planar contact surface arranged on the main body and in contact with the first surface of the steel sheet,
Of the main body, a flat non-contact surface arranged on the back surface side of the contact surface and
It is arranged in a circular shape on the non-contact surface in a plan view, and has a flat surface capable of reflecting ultrasonic waves transmitted from the second surface on the back surface side of the first surface of the steel sheet and having a bottom surface parallel to the contact surface. A target for detecting the position of a steel plate with a recess. The target for detecting the position of a steel plate according to claim 8, further comprising a magnet portion arranged on the non-contact surface via a sound insulating layer. The target for detecting a steel plate position according to claim 9, further comprising a sealing portion which is arranged so as to straddle the main body portion and the magnet portion and seals the main body portion and the side surface of the magnet portion.

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