Non-variable-diameter bolt ultrasonic flaw detection verification equipment

Abstract

The utility model discloses ultrasonic flaw detection verification equipment for a non-variable-diameter bolt, and relates to the technical field of ultrasonic flaw detection. The model of the second sample bolt is the same as that of the first sample bolt; wherein an artificial defect groove with the groove depth of 1mm is formed in the second sample bolt. According to the method, the sensitivity of the ultrasonic inspection equipment is inspected by utilizing the artificial defect groove with specific parameters, so that guarantee is provided for the detection reliability of the ultrasonic inspection equipment, the flaw detection efficiency is improved, and convenience is provided for daily work.

Description

Technical Field

[0001] This application relates to the technical field of ultrasonic flaw detection, and particularly to an ultrasonic flaw detection and calibration device for non-variable diameter bolts. Background Art

[0002] Currently, the high-speed EMU products within AST company include CRH1 type trains and CRH380D type trains. The UDB01A type brake disc bolt crack detector is used to detect the non-variable diameter bolts of the trailing wheel pairs' brake discs of CRH1 type trains. This device is a special-purpose device, and the bolt specifications it can detect are M12×100mm and M12×130mm. However, the non-variable diameter bolt specifications of the trailing wheel pairs' brake discs of CRH380D type trains are M14×105mm, and the UDB01A type brake disc bolt crack detector for CRH1 type trains cannot detect the non-variable diameter bolts of the trailing wheel pairs' brake discs of CRH380D type trains.

[0003] Therefore, in order to overcome the defect that the UDB01A type brake disc bolt crack detector for CRH1 type trains cannot detect the non-variable diameter bolts of the trailing wheel pairs' brake discs of CRH380D type trains, a non-variable diameter bolt ultrasonic flaw detection and calibration device is provided herein to meet the actual needs. Summary of the Invention

[0004] Aiming at the defects existing in the prior art, the purpose of this application is to provide a non-variable diameter bolt ultrasonic flaw detection and calibration device, which uses an artificial defect groove with specific parameters to test the sensitivity of the ultrasonic inspection device, ensures the detection reliability of the ultrasonic inspection device, improves the flaw detection efficiency, and provides convenience for daily work.

[0005] To achieve the above object, the technical solution adopted in this application is:

[0006] This application provides a non-variable diameter bolt ultrasonic flaw detection and calibration device, and the flaw detection and calibration device includes:

[0007] A first sample bolt;

[0008] A second sample bolt having the same model as the first sample bolt; wherein,

[0009] An artificial defect groove with a groove depth of 1mm is provided on the second sample bolt.

[0010] Based on the above technical solution, the length direction of the artificial defect groove is perpendicular to the length direction of the second sample bolt.

[0011] Based on the above technical solution, the length direction of the artificial defect groove is perpendicular to the length direction of the second sample bolt.

[0012] Based on the above technical solution, the artificial defect groove is located at the front end of the second sample bolt.

[0013] Based on the above technical solution, the artificial defect groove is located in the 30% area at the front end of the second sample bolt.

[0014] Based on the above technical solution, the distance between the artificial defect groove and the bolt head of the second sample bolt is 96 ± 1 mm.

[0015] Based on the above technical solution, the body lengths of the first sample bolt and the second sample bolt are 113.7 mm.

[0016] Compared with the prior art, the advantages of this application are as follows:

[0017] This application uses an artificial defect groove with specific parameters to test the sensitivity of the ultrasonic inspection equipment, providing guarantee for the detection reliability of the ultrasonic inspection equipment, improving the flaw detection efficiency, and facilitating the daily work. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of the ultrasonic flaw detection calibration equipment for non-variable diameter bolts in the embodiments of this application;

[0020] Figure 2 It is a schematic diagram of the parameter design principle of the second sample bolt in the ultrasonic flaw detection calibration equipment for non-variable diameter bolts in the embodiments of this application;

[0021] In the figure:

[0022] 1. First sample bolt; 2. Second sample bolt; 20. Artificial defect groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in this application belong to the scope of protection of this application.

[0024] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0025] The embodiment of the present application provides a non-variable diameter bolt ultrasonic flaw detection calibration device, which uses an artificial defect groove with specific parameters to test the sensitivity of the ultrasonic inspection device, ensures the detection reliability of the ultrasonic inspection device, improves the flaw detection efficiency, and provides convenience for daily work.

[0026] To achieve the above technical effects, the general idea of the present application is as follows:

[0027] A non-variable diameter bolt ultrasonic flaw detection calibration device, the flaw detection calibration device includes:

[0028] A first sample bolt 1;

[0029] A second sample bolt 2 having the same model as the first sample bolt; wherein,

[0030] An artificial defect groove 20 with a groove depth of 1 mm is provided on the second sample bolt 2.

[0031] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0032] See Figures 1-2 As shown, the embodiment of the present application provides a non-variable diameter bolt ultrasonic flaw detection calibration device, the flaw detection calibration device includes:

[0033] A first sample bolt 1;

[0034] A second sample bolt 2 having the same model as the first sample bolt; wherein,

[0035] An artificial defect groove 20 with a groove depth of 1 mm is provided on the second sample bolt 2.

[0036] In the embodiment of the present application, an artificial defect groove with specific parameters is used to test the sensitivity of the ultrasonic inspection device, ensures the detection reliability of the ultrasonic inspection device, improves the flaw detection efficiency, and provides convenience for daily work.

[0037] Further, the length direction of the artificial defect groove 20 is perpendicular to the length direction of the second sample bolt 2.

[0038] It should be noted that the perpendicular length direction means that the length direction of the artificial defect groove 20 is approximately perpendicular, or nearly perpendicular, or has a perpendicular trend to the length direction of the second sample bolt 2.

[0039] Further, the length direction of the artificial defect groove 20 is perpendicular to the length direction of the second sample bolt 2.

[0040] Further, the artificial defect groove 20 is located at the front end of the second sample bolt 2.

[0041] Further, the artificial defect groove 20 is located in the 30% area at the front end of the second sample bolt 2.

[0042] Further, the distance between the artificial defect groove 20 and the bolt head of the second sample bolt 2 is 96 ± 1 mm.

[0043] Further, the bolt body lengths of the first sample bolt 1 and the second sample bolt 2 are 113.7 mm.

[0044] The technical solution of the embodiment of the present application, when specifically implemented, will be used in conjunction with an ultrasonic inspection device to verify its flaw detection sensitivity.

[0045] When in use, the first sample bolt 1 is specifically a sound and defect-free sample bolt with a specification of M14×105 mm;

[0046] The second sample bolt 2 is a sample bolt with an artificial defect groove with a depth of 1 mm and a specification of M14×105 mm;

[0047] In cooperation with a portable USM36DAC type ultrasonic inspection device and a 10 MHz 8 mm 1.5° probe for ultrasonic detection, ultrasonic flaw detection coupling agent HG99.

[0048] When in use, the portable USM36DAC type ultrasonic inspection device will be used to detect the first sample bolt 1 and the second sample bolt 2. The bolt 1 is mainly used to measure the sound velocity, and the bolt 2 is mainly used to detect defects and determine whether the artificial defect groove 20 is identified. If it is identified, it indicates that the ultrasonic inspection device meets the usage requirements and can perform ultrasonic flaw detection work. Otherwise, it indicates that the sensitivity of the ultrasonic inspection device is insufficient, and the sensitivity of the inspection device needs to be readjusted or the ultrasonic inspection device needs to be replaced.

[0049] It should be noted that in order to verify the rationality of the setting of the artificial defect groove 20, the embodiment of the present application also carried out experimental verification, and the specific process is as follows:

[0050] First, based on historical failure situations, it is understood that when the bolts of the EMU brake disc break, they mostly break at the front end. To avoid this problem from happening again, the artificial defect groove 20 is also designed at the front end of the second sample bolt 2.

[0051] Initially, the depth of the artificial defect groove 20 is set to not more than 2 mm, and experiments are carried out based on this initial setting. Subsequently, it is revised according to the actual flaw detection situation. The initial design parameters are as follows:

[0052] 1: a = 80 mm, b = 1 mm;

[0053] 2: a = 80 mm, b = 2 mm;

[0054] 3: a = 90 mm, b = 1 mm;

[0055] 4: a = 90 mm, b = 2 mm;

[0056] 5: a = 85 - 87 mm, b = 1 mm;

[0057] 6: a = 85 - 87 mm, b = 2 mm;

[0058] 7: a = 94 - 96 mm, b = 1 mm;

[0059] 8: a = 95 - 96 mm, b = 2 mm;

[0060] 9): a = 98 - 100 mm, b = 1 mm;

[0061] 10): a = 98 - 100 mm, b = 2 mm;

[0062] Among them, as shown in the Figure 2 drawings of the specification, a is the length from the bolt head to the starting point of the artificial defect groove 20, and b is the depth of the artificial defect groove 20.

[0063] Based on the above 10 sets of initial design parameters, the second sample bolt 2 is manufactured.

[0064] Furthermore, a USM36DAC type portable ultrasonic testing device is used, and a 10 MHz, 8 mm, 1.5° small-angle longitudinal wave ultrasonic probe is adopted to inspect the manufactured second sample bolt 2;

[0065] Finally, the inspection shows that for 7: a = 94 - 96 mm, b = 1 mm; and 8: a = 95 - 96 mm, b = 2 mm; the flaw detection sensitivities corresponding to these two sets of design parameters are relatively good, and further verification is then carried out.

[0066] The situation is as shown in Table 1 and Table 2 below:

[0067]

[0068]

[0069] Table 1

[0070]

[0071] Table 2

[0072] When using the sensitivity of the artificial defect sample bolt with a groove depth of 1 mm for UT detection, all 19 bolts that had been disassembled and verified in the factory were found to have exceeded the standard defects, and all 6 bolts returned after-sales were also found to have exceeded the standard defects. The detection rate of UT defective bolts was: 100%.

[0073] When using the sensitivity of the artificial defect sample bolt with a groove depth of 1.5 mm for UT detection, 2 out of the 19 bolts that had been disassembled and verified in the factory were found to have exceeded the standard defects; 4 out of the 6 bolts returned after-sales were found to have exceeded the standard defects. The detection rate of UT defective bolts was: 24%.

[0074] When using the sensitivity of the artificial defect sample bolt with a groove depth of 2 mm for detection, no exceeded-standard defects were found in the 19 bolts that had been disassembled and verified in the factory; 2 out of the 6 bolts returned after-sales were found to have exceeded the standard defects. The detection rate of UT defective bolts was: 8%.

[0075] By analyzing the verification results, the following problems were found:

[0076] 1. When using a 2-mm artificial defect for equipment calibration, for 2 bolts with cracks detected by surface magnetic particle inspection, no defect alarm display was found when using UT inspection.

[0077] 2. False alarms occurred outside 98 mm from the detection surface.

[0078] Therefore, the analysis conclusions are as follows:

[0079] 1. For the existing detected defects, a certain proportion of undetected defects will be caused by 2-mm artificial defects.

[0080] 2. The false alarms outside 98 mm from the detection surface are mainly caused by the ultrasonic reflection due to the bolt contour. Especially at the distance of 98.5 - 99.5 mm from the detection surface, the fixed wave phenomenon causing false alarms is very obvious. When using new bolts for detection, the false alarm phenomenon caused by the contour wave reflection still appears.

[0081] Thus, the improvement suggestions are as follows:

[0082] 1. When using a 2-mm artificial defect for equipment calibration, defects equivalent to 2-mm artificial defects cannot be detected. For such situations, the following suggestions are made:

[0083] According to the verification situation, change the grooving depth of the artificial defect size from 2 mm to 1 mm.

[0084] 2. False alarms occur outside 98 mm from the detection surface. For such situations, the following suggestions are made:

[0085] Analyze according to the actual fracture position of the bolt, accurately detect the area, and only consider the area within 98 mm from the detection surface.

[0086] Final design analysis:

[0087] By analyzing the sensitivity measurement results, an artificial defect with a groove depth of 1 mm was finally used for flaw detection, and the detection range was 92 - 98 mm.

[0088] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0089] It should be noted that in the present application, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0090] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An ultrasonic flaw detection calibration device for non-variable diameter bolts, characterized in that, The flaw detection and calibration equipment includes: The first sample bolt (1); A second sample bolt (2) with the same model as the first sample bolt; wherein, An artificial defect groove (20) with a groove depth of 1 mm is provided on the second sample bolt (2).

2. The ultrasonic flaw detection and calibration equipment for non-variable diameter bolts according to claim 1, wherein: The length direction of the artificial defect groove (20) is perpendicular to the length direction of the second sample bolt (2).

3. The ultrasonic flaw detection and calibration equipment for non-variable diameter bolts according to claim 1, wherein: The length direction of the artificial defect groove (20) is perpendicular to the length direction of the second sample bolt (2).

4. The ultrasonic flaw detection and calibration equipment for non-variable diameter bolts according to claim 1, wherein: The artificial defect groove (20) is located at the front end of the second sample bolt (2).

5. The ultrasonic flaw detection and calibration equipment for non-variable diameter bolts according to claim 4, wherein: The artificial defect groove (20) is located in the 30% area at the front end of the second sample bolt (2).

6. The ultrasonic flaw detection and calibration equipment for non-variable diameter bolts according to claim 1, wherein: The distance between the artificial defect groove (20) and the bolt head of the second sample bolt (2) is 96 ± 1 mm.

7. The ultrasonic flaw detection and calibration equipment for non-variable diameter bolts according to claim 1, wherein: The body lengths of the first sample bolt (1) and the second sample bolt (2) are 113.7 mm.

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