A standard test plate for plate automatic flaw detector and its use method

Abstract

The present invention discloses a standard test plate for an automatic flaw detector for plates, which relates to the field of ultrasonic flaw detection technology, and comprises a plate body, wherein the plate body is provided with a plurality of flat-bottom holes and a plurality of slots, wherein the diameters and depths of the plurality of flat-bottom holes are different. The present invention also discloses a method for using the standard test plate for an automatic flaw detector for plates. The defect design on the standard test plate for the automatic flaw detector for plates provided by the present invention is complete, which can truly reflect the flaw detection performance of the ultrasonic flaw detector, and avoid the phenomenon of missing defects in steel plates.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic flaw detection, and in particular to a standard test plate of a plate automatic flaw detector and a use method thereof. Background Art

[0002] Ultrasonic automatic flaw detector is an important means to conduct internal quality inspection of steel pipes, steel bars and steel plates required for flaw detection on steel production lines, and to conduct online automatic flaw detection in accordance with the standards and regulations corresponding to different countries, different contents and properties, so as to accurately determine the internal defects and performance of steel. Ultrasonic flaw detection belongs to non-destructive testing. The principle is that when ultrasonic waves propagate in steel plates, they have the characteristics of reflection on different quality interfaces. If they encounter defects, ultrasonic waves are reflected back on the defects, and the flaw detector can display the reflected waves.

[0003] In order to test the performance of automatic flaw detection equipment and probes and determine the sensitivity of flaw detection, an automatic flaw detector test plate is generally designed, and various defects are made in advance inside the test plate. The performance indicators of the equipment are displayed by the detection degree of each defect. In actual operation, it is stipulated that the test plate is tested every 4 hours, and the current status of the equipment is determined by the completeness of each defect displayed on the test plate on the spectrum. Since the design of the test plate is different, some test plates are incomplete and cannot reflect the actual performance of the equipment, which will cause the defects of the steel plate to be missed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the prior art and provide a standard test plate for an automatic flaw detector for plates and a method for using the same.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A standard test plate for a plate automatic flaw detector comprises a plate body. The plate body is provided with a plurality of flat bottom holes and a plurality of slots. The diameters and depths of the plurality of flat bottom holes are different.

[0007] As a preferred solution of the standard test plate for the automatic flaw detector of plate materials described in the present invention, the flat-bottom holes include a first row of holes, a second row of holes and a third row of holes equidistantly arranged along the width direction of the plate body, the diameter of the first row of holes is 5 mm, the diameter of the second row of holes is 3 mm, the diameter of the third row of holes is 2 mm, and the depths of the flat-bottom holes in the first row of holes, the second row of holes and the third row of holes increase successively.

[0008] As a preferred solution of the standard test plate of the plate automatic flaw detector of the present invention, the flat-bottom holes also include a fourth row of holes and a fifth row of holes equidistantly arranged along the width direction of the plate body, the fourth row of holes and the fifth row of holes are respectively located at both ends of the length direction of the plate body, and the spacing between the adjacent plate body ends is 20 mm, the fourth row of holes and the fifth row of holes both include flat-bottom holes with a diameter of 3 mm and a diameter of 5 mm, and the flat-bottom holes with a diameter of 3 mm and the flat-bottom holes with a diameter of 5 mm are alternately arranged, and the depths of the flat-bottom holes in the fourth row of holes and the fifth row of holes increase successively.

[0009] As a preferred solution of the standard test plate of the automatic flaw detector for plates described in the present invention, the thickness of the plate body is 30 mm, the first row of holes, the second row of holes, the third row of holes, the fourth row of holes and the fifth row of holes all include eight flat-bottom holes, and the depths of the eight flat-bottom holes in any row of holes are 1.5 mm, 2 mm, 8 mm, 14 mm, 20 mm, 26 mm, 28 mm and 28.5 mm respectively.

[0010] As a preferred solution of the standard test plate of the plate automatic flaw detector of the present invention, the spacing between two adjacent flat-bottom holes in any row of holes is 50 mm.

[0011] As a preferred solution of the standard test plate of the plate automatic flaw detector of the present invention, the flat-bottom holes also include a sixth row of holes and a seventh row of holes arranged in sequence along the length direction of the plate body, the sixth row of holes and the seventh row of holes are respectively located on both sides of the plate body, and the spacing between the adjacent side edges of the plate body is 10 mm, the sixth row of holes and the seventh row of holes both include flat-bottom holes with a diameter of 3 mm and a diameter of 5 mm, and the flat-bottom holes with a diameter of 3 mm and the flat-bottom holes with a diameter of 5 mm are alternately arranged, and the depths of the flat-bottom holes in the sixth row of holes and the seventh row of holes increase successively.

[0012] As a preferred solution of the standard test plate of the automatic flaw detector for plates described in the present invention, the sixth row of holes and the seventh row of holes each include six flat-bottom holes, and the depths of the six flat-bottom holes are 2 mm, 8 mm, 14 mm, 20 mm, 26 mm, and 28 mm, respectively.

[0013] As a preferred solution of the standard test plate of the automatic flaw detector for plates described in the present invention, the grooves include a first groove body and a second groove body arranged along the width direction of the plate body, and a third groove body and a fourth groove body arranged obliquely and parallel to each other, and the width of the first groove body, the second groove body, the third groove body and the fourth groove body are all 5 mm, and the depth is 5 mm.

[0014] A method for using a standard test plate of a plate automatic flaw detector comprises the following steps:

[0015] S1: The two rows of probes of the ultrasonic automatic flaw detector are arranged equidistantly along the width direction of the plate. The spacing between any two adjacent probes in each row is 50mm, and the two rows of probes are staggered. The two rows of probes perform 100% full-plane inspection on the plate surface;

[0016] S2: The test plate moves to the left at a constant speed until it moves out of the detection area of ​​the probe, and the ultrasonic flaw detector displays the detected defects on the display;

[0017] S3: Compare the defects detected by the ultrasonic flaw detector with the defects existing on the test plate to evaluate the performance of the ultrasonic flaw detector.

[0018] The beneficial effects of the present invention are:

[0019] The defect design on the standard test plate of the plate automatic flaw detector provided by the present invention is complete, which can truly reflect the flaw detection performance of the ultrasonic flaw detector and avoid the phenomenon of missing steel plate defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0021] Figure 1 A schematic diagram of defects of a standard test plate of the plate automatic flaw detector provided by the present invention;

[0022] Figure 2 A schematic diagram of the dimensions of each flat-bottom hole on a standard test plate of the plate automatic flaw detector provided by the present invention;

[0023] Figure 3 This is a schematic diagram of the position of the probe on the ultrasonic flaw detector during flaw detection. DETAILED DESCRIPTION

[0024] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific implementation modes and in combination with the accompanying drawings.

[0025] This embodiment provides a standard test plate for an automatic plate flaw detector, including a plate body with a thickness of 30 mm. A plurality of flat-bottom holes and a plurality of slots are opened on the plate body as defects on the test plate. The detection degree of these defects by an ultrasonic flaw detector can display the performance indicators of the equipment.

[0026] Specifically, the plurality of flat bottom holes include a first row of holes (i.e. Figure 1 The D row of holes in the Figure 1 The E row of holes), the third row of holes (i.e. Figure 1 The fourth row of holes (i.e. Figure 1 The C row of holes in the Figure 1 In the figure, each row of holes includes eight flat-bottom holes, which are numbered D1 to D8, E1 to E8, F1 to F8, C1 to C8, and L1 to L8.

[0027] Among them, the diameter of the flat-bottom holes in the first row of holes (i.e., D1 to D8) is 5 mm, the diameter of the flat-bottom holes in the second row of holes (i.e., E1 to E8) is 3 mm, the diameter of the flat-bottom holes in the third row of holes (i.e., F1 to F8) is 2 mm, and the fourth and fifth rows of holes include four flat-bottom holes with a diameter of 5 mm and four flat-bottom holes with a diameter of 3 mm, and the flat-bottom holes with a diameter of 5 mm and the flat-bottom holes with a diameter of 3 mm are arranged alternately along the width direction of the plate body. The depths of the flat-bottom holes in these five rows of holes increase in sequence, and the depths of the eight flat-bottom holes in any row of holes are 1.5 mm, 2 mm, 8 mm, 14 mm, 20 mm, 26 mm, 28 mm, and 28.5 mm from top to bottom. The spacing between two adjacent flat-bottom holes in any row of holes is 50 mm.

[0028] It should be noted that the fourth row of holes (i.e., C row of holes) is adjacent to the left end of the plate body, and the distance between the left end of the flat-bottomed holes in the fourth row of holes and the left end of the plate body is 20 mm, and the fifth row of holes (i.e., L row of holes) is adjacent to the right end of the plate body, and the distance between the right end of the flat-bottomed holes in the fifth row of holes and the right end of the plate body is 20 mm. The first row of holes, the second row of holes, and the third row of holes are all located between the fourth row of holes and the fifth row of holes.

[0029] In addition, the flat-bottomed holes on the plate body also include a sixth row of holes (i.e. Figure 1 The G row of holes in the Figure 1 The sixth row of holes (i.e., the G row of holes) is adjacent to the upper end of the plate body, and the spacing between the upper ends of the flat-bottom holes in the sixth row of holes and the upper end of the plate body is 10 mm. The seventh row of holes (i.e., the H row of holes) is adjacent to the lower end of the plate body, and the spacing between the lower ends of the flat-bottom holes in the seventh row of holes and the lower end of the plate body is 10 mm.

[0030] The sixth and seventh rows of holes each include six flat-bottom holes, which are numbered G1 to G6 and H1 to H6. The diameters of G1, G3 and G5, H1, H3 and H5 are 5 mm, and the diameters of G2, G4 and G6, H2, H4 and H6 are 3 mm. The depths of the six flat-bottom holes in the sixth and seventh rows of holes are 2 mm, 8 mm, 14 mm, 20 mm, 26 mm and 28 mm from left to right.

[0031] In addition, the slots formed on the plate body include a first slot body (i.e. Figure 1 N1 in the second tank (i.e. Figure 1 N2 in the figure) and a third trough body (i.e. Figure 1 M1 in the figure) and the fourth tank (i.e. Figure 1 In M2), the width of the first groove body, the second groove body, the third groove body and the fourth groove body are all 5 mm, and the depth is all 5 mm.

[0032] When it is necessary to evaluate the actual flaw detection sensitivity of the ultrasonic flaw detector, the detection rate of the flat-bottom holes with a diameter of 3 mm on the test plate can be used for evaluation, that is, the detection rate of the second row of holes (E row of holes). The flat-bottom holes in the second row are arranged equidistantly along the width of the test plate to truly reflect the sensitivity of each probe of the ultrasonic flaw detector, and the different depths of each flat-bottom hole in the second row of holes can represent the ability to detect different steel plate thickness ranges.

[0033] When it is necessary to evaluate the sensitivity of the ultrasonic flaw detector to meet the highest domestic and international flaw detection standards, the detection rate of flat-bottom holes with a diameter of 5 mm on the test plate can be used for evaluation, that is, the detection rate of the first row of holes (D row of holes). The flat-bottom holes in the second row are arranged equidistantly along the width of the test plate to truly reflect the sensitivity of each probe of the ultrasonic flaw detector, and the different depths of each flat-bottom hole in the second row of holes can represent the ability to detect different steel plate thickness ranges.

[0034] When it is necessary to evaluate the best sensitivity that the ultrasonic flaw detector can achieve, the detection rate of the flat-bottom holes with a diameter of 2 mm on the test plate can be used for evaluation, that is, the detection rate of the third row of holes (F row of holes). The flat-bottom holes in the third row are arranged equidistantly along the width of the test plate to truly reflect the sensitivity of each probe of the ultrasonic flaw detector, and the different depths of each flat-bottom hole in the third row of holes can represent the ability to detect different steel plate thickness ranges.

[0035] When it is necessary to evaluate the sensitivity of the ultrasonic flaw detector to the blind areas of the upper and lower surfaces of the plate, the evaluation can be carried out based on the detection rates of C1, D1, E1, F1, C8, D8, E8, and F8. Among these eight flat-bottom holes, the depths of C1, D1, E1, and F1 are all 1.5mm, while the depths of C8, D8, E8, and F8 are all 28.5mm. Since the thickness of the plate is 30mm, the distance between the bottom of the four flat-bottom holes C8, D8, E8, and F8 and the back of the plate is also 1.5mm.

[0036] When it is necessary to evaluate the sensitivity of the ultrasonic flaw detector to the blind area at the head and tail of the plate, the evaluation can be carried out based on the detection rate of the fourth row of holes (C row of holes) and the fifth row of holes (L row of holes).

[0037] When it is necessary to evaluate the sensitivity of the ultrasonic flaw detector to the blind area on the edge of the plate, the evaluation can be carried out based on the detection rate of the sixth row of holes (G row of holes) and the seventh row of holes (H row of holes).

[0038] When it is necessary to evaluate the normal operation of the measuring wheel of the ultrasonic flaw detector and the joint degree of the A-row and B-row probes, the detection rate of the four grooves on the test plate can be used for evaluation.

[0039] Therefore, the defect design on the standard test plate of the plate automatic flaw detector provided by the present invention is complete, which can truly reflect the flaw detection performance of the ultrasonic flaw detector and avoid the phenomenon of missing steel plate defects.

[0040] This embodiment also provides a method for using a standard test plate of a plate automatic flaw detector, comprising the following steps:

[0041] S1: Arrange the two rows of probes of the ultrasonic automatic flaw detector in the width direction of the plate at equal intervals. The spacing between any two adjacent probes in each row is 50 mm, and the two rows of probes are staggered. When the left end of the test plate is detected to be under the probe, the probe automatically falls to the surface of the test plate. The probe is installed in the probe box. When the probe is calibrated, there is a 0.3 mm water film gap between the probe and the wear-resistant plate, and the wear-resistant plate is in direct contact with the steel plate.

[0042] S2: The test plate moves to the left at a constant speed until it moves out of the detection area of ​​the probe, and the ultrasonic flaw detector displays the detected defects on the display;

[0043] S3: Compare the defects detected by the ultrasonic flaw detector with the defects existing on the test plate to evaluate the performance of the ultrasonic flaw detector.

[0044] The general flaw detection requirements of ultrasonic flaw detectors are: the detection rate of flat-bottom holes with a diameter of 5 mm is 100%, the detection rate of flat-bottom holes with a diameter of 3 mm is greater than or equal to 98%, and there is no detection rate requirement for flat-bottom holes with a diameter of 2 mm.

[0045] In addition to the above embodiments, the present invention may also have other implementation modes; any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A standard test plate for a plate automatic flaw detector, comprising a plate body, characterized in that: The plate body is provided with a plurality of flat bottom holes and a plurality of slots, and the diameters and depths of the plurality of flat bottom holes are different; The flat bottom holes include a first row of holes, a second row of holes and a third row of holes which are arranged equidistantly along the width direction of the plate body. The diameter of the first row of holes is 5 mm, the diameter of the second row of holes is 3 mm, the diameter of the third row of holes is 2 mm, and the depths of the flat-bottomed holes in the first row of holes, the second row of holes and the third row of holes increase in sequence; The flat bottom holes further include a fourth row of holes and a fifth row of holes which are arranged equidistantly along the width direction of the plate body. The fourth row of holes and the fifth row of holes are respectively located at both ends of the length direction of the plate body, and the spacing between the ends adjacent to the length direction of the plate body is 20 mm. The fourth row of holes and the fifth row of holes both include flat-bottom holes with a diameter of 3 mm and a diameter of 5 mm, and the flat-bottom holes with a diameter of 3 mm and the flat-bottom holes with a diameter of 5 mm are arranged alternately, and the depths of the flat-bottom holes in the fourth row of holes and the fifth row of holes increase successively; The thickness of the plate body is 30 mm, the first row of holes, the second row of holes, the third row of holes, the fourth row of holes and the fifth row of holes each include eight flat-bottom holes, and the depths of the eight flat-bottom holes in any row of holes are 1.5 mm, 2 mm, 8 mm, 14 mm, 20 mm, 26 mm, 28 mm and 28.5 mm, respectively; The flat bottom holes further include a sixth row of holes and a seventh row of holes sequentially arranged along the length direction of the plate body, the sixth row of holes and the seventh row of holes are respectively located on both sides of the plate body, and the spacing between the ends adjacent to the width direction of the plate body is 10 mm. The sixth row of holes and the seventh row of holes both include flat-bottom holes with a diameter of 3 mm and a diameter of 5 mm, and the flat-bottom holes with a diameter of 3 mm and the flat-bottom holes with a diameter of 5 mm are arranged alternately, and the depths of the flat-bottom holes in the sixth row of holes and the seventh row of holes increase successively; The distance between two adjacent flat-bottom holes in any row of holes is 50 mm.

2. A standard test plate for plate automatic flaw detector according to claim 1, characterized in that: The sixth row of holes and the seventh row of holes each include six flat-bottom holes, and the depths of the six flat-bottom holes are 2 mm, 8 mm, 14 mm, 20 mm, 26 mm, and 28 mm, respectively.

3. A standard test plate for plate automatic flaw detector according to claim 1, characterized in that: The slots include a first slot body and a second slot body arranged along the width direction of the plate body, and a third slot body and a fourth slot body arranged parallel to each other and inclined. The width of the first groove body, the second groove body, the third groove body and the fourth groove body are all 5 mm, and the depth is all 5 mm.

4. A method for using the standard test plate of the plate automatic flaw detector according to claim 1, characterized in that: The following steps are involved: S1: Arrange the two rows of probes of the ultrasonic automatic flaw detector in the width direction of the plate in sequence and at equal intervals. The spacing between any two adjacent probes in each row is 50 mm, and the two rows of probes are staggered and placed at the left end of the surface of the test plate; S2: The test plate moves to the left at a constant speed until it moves out of the detection area of ​​the probe, and the ultrasonic flaw detector displays the detected defects on the display; S3: Compare the defects detected by the ultrasonic flaw detector with the defects existing on the test plate to evaluate the performance of the ultrasonic flaw detector.

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