Positioning test block and method for determining relative positions of two sides of steel plate

Abstract

The present invention discloses a positioning test block and method for measuring the relative positions of the surfaces on both sides of a steel plate. The top surface of the positioning test block is provided with a rectangular long groove, the two ends are provided with sharp angle grooves, a flat bottom hole is provided between the sharp corner top of the sharp angle groove and the rectangular long groove, and the bottom surface of the test block body is provided with blind holes on both sides of the sharp angle groove, and circular magnets are embedded in the blind holes. The method draws a positioning straight line on the surface of one side of the steel plate, and the bottom surface of the positioning test block is coated with a coupling agent and adsorbed on the surface of the steel plate, and the sharp corners of the sharp angle grooves on the two end surfaces coincide with the positioning straight line; an area roughly corresponding to the positioning straight line is found on the surface of the other side of the steel plate and a coupling agent is applied; the area is scanned with an ultrasonic probe to determine the two positions corresponding to the flat bottom hole and mark the center position of the circle; the two centers of the circle are connected and extended to obtain a straight line corresponding to the projection position of the positioning straight line drawn on the surface of one side of the steel plate. The present invention applies the principle of ultrasonic detection technology and uses a positioning test block to measure the relative positions of the surfaces on both sides of the steel plate.

Description

Technical Field

[0001] The invention relates to the technical field of nondestructive testing, and in particular to a positioning test block and a method for measuring the relative positions of two side surfaces of a steel plate. Background Art

[0002] During on-site construction of steel equipment or steel structures, it is sometimes necessary to perform construction operations on the two sides of a steel plate at the relative projection positions or to perform construction operations at a certain distance from the opposite relative position, such as welding, drilling, marking, etc. Figure 1 As shown, the mutual projection positions of certain points A and B on both sides of the steel plate 1 are D and D', and the mutual projection positions of certain lines 11 on both sides of the steel plate 1 are L and L'. For smaller, single or regular-shaped steel plates, this positioning can be achieved through geometric measurement, but for actual on-site construction, the steel plates have been spliced ​​into a part of the equipment or the steel plates have a complex shape and structure, and it is difficult to locate them through geometric measurement marks. For example, during the manufacturing process of the hull, it is very difficult to achieve accurate positioning on both sides of the shipboard. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a positioning test block and method for measuring the relative positions of the surfaces on both sides of a steel plate. The positioning test block and method solve the problem that during the manufacturing, inspection and maintenance of steel equipment, construction operations need to be performed on the relative parts on both sides of the steel plate but cannot be positioned quickly and accurately. The principle of ultrasonic detection technology is applied to achieve the measurement of the relative positions of the surfaces on both sides of the steel plate with the help of a special positioning test block.

[0004] In order to solve the above technical problems, the positioning test block for measuring the relative position of the two side surfaces of a steel plate of the present invention comprises a test block body and a circular magnet, the cross-section of the test block body is rectangular, and a rectangular long groove is provided in the center of the top surface of the test block body along the length direction of the test block body, sharp angle grooves are provided on the end surfaces at both ends, and a flat bottom hole is provided between the sharp angle top of the sharp angle groove and the rectangular long groove, and blind holes are provided on both sides of the sharp angle groove on the bottom surface of the test block body, and the circular magnet is embedded in the blind hole and tightly fixed.

[0005] Furthermore, the test block body has a thickness H ≥ 20 mm, a length L ≥ 200 mm, a width W of 40 mm to 50 mm, a length Lc ≥ 50 mm of the rectangular long groove, a diameter of the flat-bottom hole of 10 mm, and the depths of the rectangular long groove and the flat-bottom hole are the same. The distance h between the bottom surface of the rectangular long groove and the flat-bottom hole and the bottom surface of the test block body is calculated and determined based on the material of the test block body and the corresponding steel plate thickness and the speed of sound relationship between the two, so as to ensure that the echo of the bottom surface of the rectangular long groove appears clearly before the secondary bottom surface echo of the steel plate.

[0006] Furthermore, the rectangular long groove, flat bottom hole, blind hole and sharp angle groove of the test block body are obtained by mechanical processing.

[0007] Furthermore, the test block body can be made of aluminum alloy, organic glass, polymer or other synthetic materials.

[0008] A method for measuring the relative positions of the two side surfaces of a steel plate based on the positioning test block comprises the following steps:

[0009] Step 1: Select an ultrasonic straight probe with a frequency and chip size suitable for steel plate positioning detection, or select an electromagnetic ultrasonic or phased array ultrasonic probe. Connect the ultrasonic probe to the ultrasonic testing instrument and perform system and sensitivity calibration to ensure that the sound path range and sensitivity set by the ultrasonic testing instrument meet the detection requirements;

[0010] Step 2: Draw a positioning straight line on the surface of one side of the steel plate, evenly apply a layer of coupling agent on the bottom surface of the positioning test block, and then adsorb the test block body on the surface of one side of the steel plate through a circular magnet, so that the sharp corners of the sharp angle grooves on both end surfaces of the test block body coincide with the positioning straight line;

[0011] Step 3: Find an area on the other side of the steel plate that is roughly adjacent to or roughly corresponding to the positioning straight line, and apply coupling agent in the area;

[0012] Step 4: Use the ultrasonic probe to scan the area where the coupling agent has been applied, and observe the pulse echo characteristics and changes on the display screen of the ultrasonic testing instrument;

[0013] Step 5: During the ultrasonic probe scanning process, when a pulse echo signal corresponding to the depth position of the bottom surface of the rectangular long groove or flat bottom hole of the positioning test block appears between the primary bottom wave and the secondary bottom wave of the steel plate on the display screen, slow down the scanning speed and conduct a small-scale precision inspection;

[0014] Step 6: Preliminarily determine two positions corresponding to the flat-bottomed hole based on the ultrasonic echo characteristics, scan the two positions respectively, determine the center position of the flat-bottomed hole and mark it;

[0015] Step 7: Connect the centers of the two flat-bottom holes determined based on the pulse echo and make an extension line, so as to obtain a straight line on the other side of the steel plate corresponding to the projection position of the drawn positioning straight line.

[0016] Since the positioning test block and method for measuring the relative position of the two side surfaces of the steel plate of the present invention adopt the above-mentioned technical scheme, that is, the positioning test block includes a test block body and a circular magnet, a rectangular long groove is provided in the center of the top surface of the test block body, sharp angle grooves are provided on the end surfaces at both ends, a flat bottom hole is provided between the sharp angle top of the sharp angle groove and the rectangular long groove, and blind holes are provided on both sides of the sharp angle groove on the bottom surface of the test block body, and the circular magnets are embedded in the blind holes. This method selects an ultrasonic probe and connects it to an ultrasonic testing instrument to perform system and sensitivity calibration; draws a positioning straight line on the surface of one side of the steel plate, and after applying coupling agent on the bottom surface of the positioning test block, it is adsorbed on the surface of the steel plate, and the sharp corners of the sharp angle grooves on both end faces coincide with the positioning straight line; finds an area roughly corresponding to the positioning straight line on the surface of the other side of the steel plate, and applies coupling agent in this area; scans the area with an ultrasonic probe, and observes the pulse echo characteristics and changes on the display screen at the same time; when a pulse echo signal appears, slows down the scanning speed and conducts a small-scale precision exploration; determines the two positions corresponding to the flat-bottom hole and marks the center position of the circle; connects the two centers of the circle and makes an extension line to obtain a straight line corresponding to the projection position of the positioning straight line drawn on the other side of the steel plate. This positioning test block and method solves the problem that during the manufacturing, inspection and maintenance of steel equipment, construction operations need to be performed on the relative parts on both sides of the steel plate, but the positioning cannot be done quickly and accurately. The principle of ultrasonic detection technology is applied, and the relative position of the surfaces of both sides of the steel plate is determined with the help of a special positioning test block. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0018] Figure 1 It is a schematic diagram of the relative positions of the two sides of the steel plate;

[0019] Figure 2 This is a schematic diagram of the structure of a positioning test block for measuring the relative positions of the surfaces on both sides of a steel plate according to the present invention;

[0020] Figure 3 for Figure 2 Top view of the . DETAILED DESCRIPTION

[0021] Implementation example Figure 2 and Figure 3 As shown, the positioning test block for measuring the relative position of the two side surfaces of the steel plate of the present invention comprises a test block body 2 and a circular magnet 3, wherein the cross section of the test block body 2 is rectangular, and a rectangular long groove 21 is provided in the center of the top surface of the test block body 2 along the length direction of the test block body 2, sharp angle grooves 22 are provided on the end surfaces at both ends, and a flat bottom hole 23 is provided between the sharp angle top of the sharp angle groove 22 and the rectangular long groove 21, and blind holes 24 are provided on both sides of the sharp angle groove 22 on the bottom surface of the test block body 2, and the circular magnet 3 is embedded in the blind hole 24 and tightly fixed.

[0022] Furthermore, the test block body 2 has a thickness H ≥ 20 mm, a length L ≥ 200 mm, a width W of 40 mm to 50 mm, a length Lc ≥ 50 mm of the rectangular long groove 21, a diameter of the flat-bottomed hole 23 of 10 mm, and the rectangular long groove 21 and the flat-bottomed hole 23 have the same depth. The distance h between the bottom surface of the rectangular long groove 21 and the flat-bottomed hole 23 and the bottom surface of the test block body 2 is calculated and determined based on the material of the test block body 2 and the corresponding steel plate thickness and the speed of sound relationship between the two, so as to ensure that the echo of the bottom surface of the rectangular long groove 21 appears clearly before the secondary bottom surface echo of the steel plate.

[0023] Furthermore, the rectangular long groove 21, the flat bottom hole 23, the blind hole 24 and the sharp angle groove 22 of the test block body 2 are obtained by mechanical processing.

[0024] Furthermore, the test block body 2 can be made of aluminum alloy, organic glass, polymer or other synthetic materials.

[0025] A method for measuring the relative positions of the two side surfaces of a steel plate based on the positioning test block comprises the following steps:

[0026] Step 1: Select an ultrasonic straight probe with a frequency and chip size suitable for steel plate positioning detection, or select an electromagnetic ultrasonic or phased array ultrasonic probe. Connect the ultrasonic probe to the ultrasonic testing instrument and perform system and sensitivity calibration to ensure that the sound path range and sensitivity set by the ultrasonic testing instrument meet the detection requirements;

[0027] Step 2: Draw a positioning straight line on the surface of one side of the steel plate, evenly apply a layer of coupling agent on the bottom surface of the positioning test block, and then adsorb the test block body on the surface of one side of the steel plate through a circular magnet, so that the sharp corners of the sharp angle grooves on both end surfaces of the test block body coincide with the positioning straight line;

[0028] Step 3: Find an area on the other side of the steel plate that is roughly adjacent to or roughly corresponding to the positioning straight line, and apply coupling agent in the area;

[0029] Step 4: Use the ultrasonic probe to scan the area where the coupling agent has been applied, and observe the pulse echo characteristics and changes on the display screen of the ultrasonic testing instrument;

[0030] Step 5: During the ultrasonic probe scanning process, when a pulse echo signal corresponding to the depth position of the bottom surface of the rectangular long groove or flat bottom hole of the positioning test block appears between the primary bottom wave and the secondary bottom wave of the steel plate on the display screen, slow down the scanning speed and conduct a small-scale precision inspection;

[0031] Step 6: Preliminarily determine two positions corresponding to the flat-bottomed hole based on the ultrasonic echo characteristics, scan the two positions respectively, determine the center position of the flat-bottomed hole and mark it;

[0032] Step 7: Connect the centers of the two flat-bottom holes determined based on the pulse echo and make an extension line, so as to obtain a straight line on the other side of the steel plate corresponding to the projection position of the drawn positioning straight line.

[0033] The present invention applies the principle of ultrasonic detection technology, with the help of a special positioning test block, and adopts a longitudinal wave scanning method to determine the relative positions of the surfaces on both sides of the steel plate. The accuracy of marking or fixing points can reach within ±2mm, and the measuring method is simple and easy. The positioning test block has a simple structure and is easy to manufacture, which solves the problem of accurate positioning of both sides of the steel plate.

Claims

1. A positioning test block for measuring the relative positions of the two side surfaces of a steel plate, characterized in that: The positioning test block includes a test block body and a circular magnet. The test block body has a rectangular cross-section, and a rectangular long groove is provided in the center of the top surface of the test block body along the length direction of the test block body, sharp-angle grooves are provided on both end surfaces, and a flat-bottom hole is provided between the sharp-angle top of the sharp-angle groove and the rectangular long groove. The bottom surface of the test block body is provided with blind holes on both sides of the sharp-angle groove, and the circular magnet is embedded in the blind holes and tightly fixed. The rectangular long groove and the flat-bottom hole have the same depth. The distance h between the bottom surface of the rectangular long groove and the flat-bottom hole and the bottom surface of the test block body is calculated and determined based on the material of the test block body and the corresponding steel plate thickness and the sound velocity relationship between the two, so as to ensure that the echo of the bottom surface of the rectangular long groove appears clearly before the secondary bottom surface echo of the steel plate.

2. The positioning test block for measuring the relative positions of the two side surfaces of a steel plate according to claim 1, characterized in that: The test block body has a thickness H≥20mm, a length L≥200mm, a width W of 40mm-50mm, a length Lc≥50mm of the rectangular long groove, and a diameter of the flat-bottom hole of 10mm.

3. The positioning test block for measuring the relative positions of the two side surfaces of a steel plate according to claim 1 or 2, characterized in that: The rectangular long groove, flat bottom hole, blind hole and sharp angle groove of the test block body are obtained by mechanical processing.

4. The positioning test block for measuring the relative positions of the two side surfaces of a steel plate according to claim 3, characterized in that: The test block body is made of aluminum alloy, organic glass or polymer synthetic material.

5. A method for measuring the relative positions of the two side surfaces of a steel plate based on the positioning test block according to any one of claims 1 to 4, characterized in that This method comprises the following steps: Step 1: Select an ultrasonic straight probe with a frequency and chip size suitable for steel plate positioning detection, or select an electromagnetic ultrasonic or phased array ultrasonic probe. Connect the ultrasonic probe to the ultrasonic testing instrument and perform system and sensitivity calibration to ensure that the sound path range and sensitivity set by the ultrasonic testing instrument meet the detection requirements; Step 2: Draw a positioning straight line on the surface of one side of the steel plate, evenly apply a layer of coupling agent on the bottom surface of the positioning test block, and then adsorb the test block body on the surface of one side of the steel plate through a circular magnet, so that the sharp corners of the sharp angle grooves on both end surfaces of the test block body coincide with the positioning straight line; Step 3: Find an area on the other side of the steel plate that is roughly adjacent to or roughly corresponding to the positioning straight line, and apply coupling agent in the area; Step 4: Use the ultrasonic probe to scan the area where the coupling agent has been applied, and observe the pulse echo characteristics and changes on the display screen of the ultrasonic testing instrument; Step 5: During the ultrasonic probe scanning process, when a pulse echo signal corresponding to the depth position of the bottom surface of the rectangular long groove or flat bottom hole of the positioning test block appears between the primary bottom wave and the secondary bottom wave of the steel plate on the display screen, slow down the scanning speed and conduct a small-scale precision inspection; Step 6: Preliminarily determine two positions corresponding to the flat-bottomed hole based on the ultrasonic echo characteristics, scan the two positions respectively, determine the center position of the flat-bottomed hole and mark it; Step 7: Connect the centers of the two flat-bottom holes determined based on the pulse echo and make an extension line, so as to obtain a straight line on the other side of the steel plate corresponding to the projection position of the drawn positioning straight line.

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