Rotary ultrasonic detection sample rod and ultrasonic detection DAC manufacturing method

Abstract

The invention relates to the technical field of material detection, in particular to a rotary ultrasonic detection sample rod and an ultrasonic detection DAC manufacturing method. The rotary ultrasonic detection sample rod comprises a main body, and a plurality of hole bodies are formed in the main body in an extending manner along the axis direction; the multiple hole bodies are arranged at intervals in the axis direction of the main body, and the distances between the multiple hole bodies and the surface of the main body are different; at least parts of the multiple hole bodies are located in the same plane perpendicular to the axis of the main body. According to the rotary ultrasonic detection sample rod and the ultrasonic detection DAC manufacturing method, the sample rod structure and the DAC manufacturing operation can be simplified, the round rod ultrasonic detection DAC manufacturing effect can be improved, the performance consistency of the cross hole combination for the DAC in long-term use can be ensured, the consistency of the detection effect can be ensured, the sample rod processing cost can be reduced, and the operation efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material detection, in particular to a rotary ultrasonic detection sample rod and an ultrasonic detection DAC manufacturing method. Background Art

[0002] Pulse reflection ultrasonic testing is an important means of internal quality inspection of metal materials and other dense materials. During automatic ultrasonic testing of round rods, the round rod passes through the ultrasonic water chamber. The probe sound field in the water chamber rotates around the round rod and emits pulsed ultrasound to realize spiral scanning of the round rod. During the scanning process, the ultrasonic probe emits pulsed ultrasound into the round rod at a certain frequency. The ultrasonic wave attenuates as the propagation distance increases in the round rod, which is manifested as the reflected signal of artificial defects of the same shape and size decreasing with the increase of the sound path distance. During ultrasonic testing, the judgment gate amplitude corresponding to a certain scanning depth range remains unchanged, which means that the judgment effect of defects of the same size at different scanning depths is different. For this reason, a distance-amplitude curve (DAC for short in English, hereinafter referred to as DAC) is usually made in ultrasonic testing, and then the sensitivity of signals at different depths is compensated according to the shape of DAC in order to accurately judge defects at different depths.

[0003] However, in the current DAC production, the processing cost of the sample rod is high, and the DAC production operation is complicated and difficult to achieve good results. Summary of the Invention

[0004] The purpose of the present invention includes providing a rotating ultrasonic detection sample rod and an ultrasonic detection DAC manufacturing method, which can simplify the sample rod structure and DAC manufacturing operation, improve the manufacturing effect of round rod ultrasonic detection DAC, ensure the consistency of the performance of the DAC cross hole combination during long-term use, and thus ensure the consistency of the detection effect. At the same time, it reduces the sample rod processing cost and improves the operating efficiency.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a rotating ultrasonic testing sample rod, comprising a main body, wherein a plurality of holes are provided in the main body along an axial direction thereof; the plurality of holes are spaced apart around the axial direction of the main body, and the plurality of holes are at different distances from a surface of the main body;

[0007] Wherein, at least parts of the plurality of holes are located in the same plane perpendicular to the axis of the main body.

[0008] In an optional embodiment, the main body includes a first sub-body and a second sub-body connected by welding, and one end of each of the plurality of holes is located at a critical surface between the first sub-body and the second sub-body.

[0009] In an optional embodiment, the plurality of holes are all opened in the second split body.

[0010] In an optional embodiment, along the axial direction of the main body, the lengths of the plurality of holes are the same.

[0011] In an optional embodiment, a first hole and a second hole are defined in the main body.

[0012] In an optional embodiment, the distance between the first hole and the surface of the main body is 10% of the diameter of the main body, and the distance between the second hole and the surface of the main body is 30% of the diameter of the main body.

[0013] In an optional embodiment, the plane where the axis of the first hole body and the axis of the main body lie is a first plane, the plane where the axis of the second hole body and the axis of the main body lie is a second plane, and the first plane is perpendicular to the second plane.

[0014] In a second aspect, the present invention provides a method for manufacturing an ultrasonic detection DAC, which is implemented using the above-mentioned rotating ultrasonic detection sample rod, comprising:

[0015] introducing a rotary ultrasonic testing sample rod into the rotary ultrasonic cavity;

[0016] Turn on the coupling water supply and the rotation of the ultrasonic cavity, so that the ultrasonic detection probe rotates around the rotating ultrasonic detection sample rod, and the interface reflection signal and the bottom surface reflection signal of the rotating ultrasonic detection sample rod appear on the instrument display;

[0017] The ultrasonic testing rod is moved axially to rotate so that the cross section of the axial center of the hole reaches the cross section of the ultrasonic testing probe. At this time, a combined hole reflection signal appears between the interface reflection signal and the bottom surface reflection signal.

[0018] Scan multiple holes and generate multiple nearest reflection signals and farthest reflection signals;

[0019] Multiple reflection signals are displayed on the instrument screen according to the scanning sound path from near to far. At the same time, the amplitude of each signal decreases as the scanning sound path increases. The sensitivity is adjusted so that the amplitude of the reflection signal of the horizontal hole in the closest sound path reaches 80%. The amplitudes of the horizontal holes in the remaining sound paths change accordingly. The highest point of each signal amplitude is fitted to form the DAC curve.

[0020] Taking the amplitude of the most recent reflected signal of the first hole body scanned as the benchmark, adjust the sensitivity compensation of subsequent signals to make the amplitudes of each signal consistent. The sensitivity compensation amplitude of each sound path signal forms a DAC compensation curve. At this time, the equipment has the same detection sensitivity for holes of the same specifications at different depths in the rotating ultrasonic testing sample rod.

[0021] In an optional embodiment, the step of scanning a plurality of apertures and forming a plurality of closest reflection signals and a farthest reflection signal comprises:

[0022] A first hole and a second hole are provided in the main body. The ultrasonic detection probe scans the first hole to form a first closest reflection signal and a first farthest reflection signal; the ultrasonic detection probe scans the second hole to form two closest reflection signals and two farthest reflection signals.

[0023] In an optional embodiment, the steps before introducing the rotary ultrasonic detection sample rod into the rotary ultrasonic cavity include:

[0024] Insert the rotary ultrasonic testing sample rod into the rotary ultrasonic cavity and ensure the concentricity, and preliminarily set the scanning display sound path range and sensitivity.

[0025] The beneficial effects of the rotary ultrasonic testing sample rod and the ultrasonic testing DAC manufacturing method provided by the embodiments of the present invention include:

[0026] The rotary ultrasonic testing sample rod comprises a main body with a plurality of holes extending along its axis. The holes are spaced apart about the main body's axis and spaced at varying distances from the main body's surface. At least portions of the holes are located within a common plane perpendicular to the main body's axis. This rotary ultrasonic testing sample rod and ultrasonic testing DAC manufacturing method can simplify the sample rod structure and DAC manufacturing operations, improve the manufacturing results of a round rod ultrasonic testing DAC, ensure consistent performance of the DAC's transverse hole combination over long-term use, and thus ensure consistent testing results. Furthermore, it reduces sample rod manufacturing costs and improves operational efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic structural diagram of a rotating ultrasonic testing sample rod provided in this embodiment;

[0029] Figure 2 A schematic diagram of the structure of the rotating ultrasonic testing sample rod and the ultrasonic testing probe provided in this embodiment from a first viewing angle;

[0030] Figure 3 A schematic diagram of the structure of the rotating ultrasonic testing sample rod, ultrasonic cavity and ultrasonic testing probe provided in this embodiment from a second viewing angle;

[0031] Figure 4 This is a schematic diagram of the DAC curve provided in this embodiment.

[0032] Icon: 100-rotating ultrasonic testing sample rod; 110-main body; 120-hole body; 111-first split body; 112-second split body; 121-first hole body; 122-second hole body; 210-ultrasonic cavity; 220-coupling water; 230-ultrasonic testing probe. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 understood as a limitation on the present invention.

[0037] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0038] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0039] Pulse reflection ultrasonic testing is an important means of internal quality inspection of metal materials and other dense materials. During automatic ultrasonic testing of round rods, the round rod passes through an ultrasonic water chamber. The probe sound field in the water chamber rotates around the round rod and emits pulsed ultrasound to achieve spiral scanning of the round rod. During the scanning process, the ultrasonic probe emits pulsed ultrasound into the round rod at a certain frequency. The ultrasonic wave attenuates as the propagation distance increases in the round rod, which is manifested as the reflected signal of artificial defects of the same shape and size decreasing with the increase of the sound path distance. During ultrasonic testing, the judgment gate amplitude corresponding to a certain scanning depth range remains unchanged, which means that the judgment effect of defects of the same size at different scanning depths is different. For this reason, a distance-amplitude curve (DAC for short in English, hereinafter referred to as DAC) is usually made in ultrasonic testing, and then the sensitivity of signals at different depths is compensated according to the shape of DAC in order to accurately judge defects at different depths.

[0040] After research, the inventors found that when making DACs, the peak positions of the rotation signals are scanned one by one according to the acoustic path of the artificial injuries from shallow to deep, and then the acoustic path DAC is fitted. The bending conditions of different interfaces are different, which correspondingly affect the scanning and reflection effects of each artificial injury, thereby affecting the overall distance-amplitude curve effect. When making DACs, each artificial injury needs to be scanned for axial positioning. It is difficult for the axial positions of different artificial injuries to be completely consistent without deviation. The above situation increases the sample rod processing cost, and at the same time makes the DAC production operation complicated and difficult to achieve good results.

[0041] For the reasons above, please refer to Figure 1-Figure 3 This embodiment provides a rotating ultrasonic testing rod 100, which includes a main body 110. The main body 110 has a plurality of holes 120 extending along its axis. The plurality of holes 120 are spaced apart around the axis of the main body 110, and the plurality of holes 120 are at different distances from the surface of the main body 110.

[0042] At least part of the plurality of holes 120 is located in the same plane perpendicular to the axis of the main body 110 .

[0043] Please refer to Figure 1-Figure 3 The working principle of the rotating ultrasonic testing sample rod 100 is:

[0044] The rotary ultrasonic testing sample rod 100 includes a main body 110, in which a plurality of holes 120 are provided extending along the axis thereof; the plurality of holes 120 are spaced apart around the axis of the main body 110, and the plurality of holes 120 are at different distances from the surface of the main body 110; wherein at least portions of the plurality of holes 120 are located in the same plane perpendicular to the axis of the main body 110.

[0045] As can be seen from the above, a plurality of holes 120 are provided in the main body 110 of the rotating ultrasonic testing sample rod 100, and the holes 120 are artificial injuries. During the testing process, since at least part of the plurality of holes 120 is located in the same plane perpendicular to the axis of the main body 110, it is possible to test all the holes 120 in the same pair relative to the axis of the rotating ultrasonic testing sample rod 100. This arrangement avoids the need to adjust the testing position and perform axial positioning scanning on each artificial injury when making a DAC, thereby simplifying the testing steps and ensuring the consistency of the axis position and the accuracy of the test.

[0046] Therefore, the rotating ultrasonic detection sample rod 100 has a simple structure and is easy to use. When it is used in the ultrasonic detection DAC manufacturing method, it can realize the detection of all hole bodies 120 (i.e., artificial injuries) based on the relative movement of the ultrasonic detection probe 230 relative to the same position of the main body 110, thereby simplifying the steps of adjusting the axial position of the ultrasonic detection probe 230 relative to the hole body 120 to be detected along the axial direction of the main body 110 during the detection process, thereby simplifying the DAC manufacturing operation, improving the round rod ultrasonic detection DAC manufacturing effect, ensuring the consistency of the DAC cross-hole combination performance during long-term use, and thus ensuring the consistency of the detection effect. At the same time, it reduces the sample rod processing cost and improves the operating efficiency.

[0047] Furthermore, the inventors discovered through research that the production of a DAC for ultrasonic testing of round rods requires a set of artificial flaws with varying scanning depths. Using flat-bottom holes requires machining radial flat-bottom holes of varying depths at different cross-sectional locations. This requires very high geometrical requirements for flat-bottom hole machining, and the random geometrical deviations of each flat-bottom hole within a set of artificial flaws make it difficult to guarantee the effectiveness of the DAC, and some DACs are even unusable. In the prior art, using transverse holes requires machining the flaws on the sawn ends of the sample rod, then welding the ends together and processing the weld surface. Multiple artificial flaws create multiple interfaces, which are prone to bending during use, shortening the life of the sample rod.

[0048] Based on this, please refer to Figure 1-Figure 3 In this embodiment, the main body 110 is configured to include a first body 111 and a second body 112 connected by welding. One end of each of the plurality of holes 120 is located at the interface between the first and second bodies 111, 112. This reduces the number of saw cuts required to machine the holes 120, thereby reducing the number of welded connection interfaces. This reduces the probability of bending damage or a shortened lifespan of the rotary ultrasonic testing sample rod 100. Furthermore, this method allows for precise machining of the holes 120, reducing the need for manual processing and ensuring the effectiveness of the fabricated DAC.

[0049] Based on the above, when configuring multiple holes 120, all holes 120 are provided in the second sub-body 112. Furthermore, along the axis of the main body 110, the holes 120 have the same length. This ensures that the relative positions of the holes 120 are maintained within the same sub-area of ​​the main body 110. This facilitates adjustment of the relative positions between the holes 120 and the ultrasonic detection probe 230 during testing using the ultrasonic detection probe 230, thereby improving the efficiency of positioning the ultrasonic detection probe 230 and, consequently, detection efficiency.

[0050] Furthermore, based on the above structure, this embodiment is described by configuring two holes 120 as an example, that is, a first hole 121 and a second hole 122 are opened in the main body 110. In other embodiments of the present invention, the number of holes 120 can be adjusted based on detection requirements.

[0051] Furthermore, the first hole 121 and the second hole 122 are at different distances from the surface of the main body 110. In this embodiment, the distance between the first hole 121 and the surface of the main body 110 is 10% of the diameter of the main body 110, and the distance between the second hole 122 and the surface of the main body 110 is 30% of the diameter of the main body 110. Furthermore, the plane in which the axis of the first hole 121 and the axis of the main body 110 lie is a first plane, and the plane in which the axis of the second hole 122 and the axis of the main body 110 lie is a second plane. The first plane is perpendicular to the second plane, that is, the radial direction of the axis of the first hole 121 is perpendicular to the radial direction of the axis of the second hole 122.

[0052] For further information, please refer to Figure 1-Figure 4 , Figure 4 Where A1 is the interface reflection signal, A2 is the first closest sound path reflection signal, A3 is the first farthest sound path reflection signal, A4 is the second closest sound path reflection signal, A5 is the second farthest sound path reflection signal, A6 is the bottom surface reflection signal, A7 is the DAC curve, and A8 is the DAC compensation curve. Based on the above-mentioned rotating ultrasonic testing sample rod 100, this embodiment further provides an ultrasonic testing DAC manufacturing method, which is implemented using the above-mentioned rotating ultrasonic testing sample rod 100, including:

[0053] Introducing the rotary ultrasonic testing sample rod 100 into the rotary ultrasonic cavity 210;

[0054] The coupling water 220 is turned on to supply water and the ultrasonic cavity 210 is turned on to rotate, so that the ultrasonic detection probe 230 rotates around the rotating ultrasonic detection sample rod 100, and the interface reflection signal and the bottom surface reflection signal of the rotating ultrasonic detection sample rod 100 appear on the instrument display screen;

[0055] The ultrasonic testing sample rod 100 is axially moved and rotated so that the cross section of the axial center of the hole body 120 reaches the cross section of the ultrasonic testing probe 230 rotation scanning. At this time, a combined hole body 120 reflection signal appears between the interface reflection signal and the bottom surface reflection signal.

[0056] Scanning a plurality of apertures 120 and generating a plurality of closest reflection signals and a farthest reflection signal;

[0057] Multiple reflection signals are displayed on the instrument screen according to the scanning sound path from near to far. At the same time, the amplitude of each signal decreases as the scanning sound path increases. The sensitivity is adjusted so that the amplitude of the reflection signal of the horizontal hole in the closest sound path reaches 80%. The amplitudes of the horizontal holes in the remaining sound paths change accordingly. The highest point of each signal amplitude is fitted to form the DAC curve.

[0058] Taking the amplitude of the most recent reflected signal when scanning the first hole 120 as a benchmark, adjust the sensitivity compensation of subsequent signals to make the amplitudes of each signal consistent. The sensitivity compensation amplitude of each sound path signal forms a DAC compensation curve. At this time, the equipment has the same detection sensitivity for holes 120 of the same specifications at different depths in the rotating ultrasonic testing sample rod 100.

[0059] The step of scanning the plurality of apertures 120 and forming a plurality of closest reflection signals and a farthest reflection signal includes:

[0060] A first hole 121 and a second hole 122 are defined in the main body 110 . The ultrasonic detection probe 230 scans the first hole 121 to generate a first closest reflection signal and a first farthest reflection signal. The ultrasonic detection probe 230 scans the second hole 122 to generate two closest reflection signals and two farthest reflection signals.

[0061] In addition, the steps before introducing the rotary ultrasonic testing sample rod 100 into the rotary ultrasonic cavity 210 include:

[0062] The rotary ultrasonic testing sample rod 100 is introduced into the rotary ultrasonic cavity 210 and the concentricity is ensured, and the scanning display sound path range and sensitivity are preliminarily set.

[0063] In summary, the steps of implementing the ultrasonic detection DAC manufacturing method based on the above-mentioned rotating ultrasonic detection sample rod 100 are as follows:

[0064] Take the main body 110 as an example, which is configured with the first hole body 121 and the second hole body 122;

[0065] First, a rotating ultrasonic testing sample rod 100 is prepared. A sample rod of the same specification as the round rod is selected to prepare the rotating ultrasonic testing sample rod 100. The sample rod is sawed into pieces, and two holes 120 (i.e., transverse holes extending along the axis of the main body 110) are machined on the same side end surface of the sample rod fracture. The two holes 120 are respectively a first hole 121 and a second hole 122.

[0066] Among them, the depth of the first hole body 121 is 10% of the diameter of the round rod, and the depth of the second hole body 122 is 30% of the diameter of the round rod; in the circumferential direction, the radial directions of the two hole bodies 120 are perpendicular to each other. After the two hole bodies 120 are processed, the fractures are welded together, and the weld surface is smoothed to obtain the rotating ultrasonic testing sample rod 100.

[0067] The ultrasonic detection DAC manufacturing method is implemented using the above-made rotating ultrasonic detection sample rod 100 as follows:

[0068] The prepared rotary ultrasonic testing sample rod 100 is introduced into the rotary ultrasonic cavity 210, and the concentricity of the prepared rotary ultrasonic testing sample rod 100 and the rotary ultrasonic cavity 210 is ensured, and the scanning display sound path range and sensitivity are preliminarily set;

[0069] DAC production, start the coupling water 220 water supply and the ultrasonic cavity 210 rotation, at this time the ultrasonic detection probe 230 rotates around the rotating ultrasonic detection sample rod 100, the instrument display screen appears the interface reflection signal and the bottom surface reflection signal of the rotating ultrasonic detection sample rod 100, the rotating ultrasonic detection sample rod 100 is moved axially so that the cross section of the axial center of the hole body 120 reaches the cross section where the ultrasonic detection probe 230 is rotating and scanning, at this time the combined cross hole reflection signal appears between the interface reflection signal and the bottom surface reflection signal;

[0070] Scan multiple holes 120. Taking the scanning of the first hole 121 and the second hole 122 as an example, the ultrasonic detection probe 230 scans the first hole 121 to form a first closest reflection signal and a first farthest reflection signal; the ultrasonic detection probe 230 scans the second hole 122 to form a second closest reflection signal and a second farthest reflection signal. The four reflection signals formed by the two holes 120 are displayed on the instrument screen from near to far according to the scanning sound range. At the same time, the amplitude of each signal decreases with the increase of the scanning sound range. The sensitivity is adjusted so that the amplitude of the horizontal hole reflection signal in the closest sound range reaches 80%, and the amplitudes of the horizontal hole signals in the remaining sound ranges change accordingly. The highest point of each signal amplitude is fitted to form the DAC curve.

[0071] Taking the amplitude of the first closest reflection signal as the benchmark, adjust the sensitivity compensation of each subsequent signal to make the amplitude of each signal consistent. The sensitivity compensation amplitude of each sound path signal forms a DAC compensation curve. At this time, the equipment has the same detection sensitivity for the same specification horizontal holes of different depths in the round rod.

[0072] In summary, the rotary ultrasonic testing sample rod 100 and the ultrasonic testing DAC manufacturing method provided in this embodiment have the following advantages:

[0073] The structure is simple, the holes 120 for DAC production are arranged on the same end surface, and the combined performance of the DAC combined transverse holes is consistent during long-term use;

[0074] The operation is simple and efficient. A DAC curve can be generated by rotating and scanning the combined hole body 120 degrees on a cross section in one operation.

[0075] The effect is accurate. The holes 120 used in DAC production are arranged on the same end surface. There is no deviation in the axial alignment of multiple interfaces during DAC production, ensuring the consistency of the axial position of each scanning hole 120, and the DAC effect is accurate.

[0076] Good economical efficiency, the holes 120 for DAC production are arranged in the same cross section, and only one fracture is required for sawing and connecting, which greatly reduces the workload compared to the processing of multiple fracture sample bars;

[0077] The invention is scientific and reasonable, and can be used for the combined transverse hole sample rod for DAC production for rotary ultrasonic detection of round rods of various specifications. In this embodiment, two combined hole bodies 120 for DAC production are set by taking a round rod of a certain specification as an example. The number of transverse holes can be changed according to the specifications of the round rod. A small-sized round rod can use one non-cross-section center transverse hole, and a larger-sized sample rod can be provided with more transverse holes. At this time, the depth of each transverse hole from the surface is reasonably set, and at the same time, the radial angles of the circumferentially adjacent transverse holes do not affect each other's scanning signals.

[0078] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily conceived by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A rotating ultrasonic testing rod, characterized in that: The rotary ultrasonic testing sample rod includes a main body, wherein a plurality of holes are provided in the main body along its axial direction; the plurality of holes are spaced apart around the axial direction of the main body, and the plurality of holes are at different distances from the surface of the main body; Wherein, at least parts of the plurality of holes are located in the same plane perpendicular to the axis of the main body.

2. The rotary ultrasonic testing sample rod according to claim 1, characterized in that: The main body includes a first sub-body and a second sub-body connected by welding, and one end of each of the plurality of holes is located at a critical surface between the first sub-body and the second sub-body.

3. The rotary ultrasonic testing sample rod according to claim 2, characterized in that: The plurality of holes are all formed in the second split body.

4. The rotary ultrasonic testing sample rod according to claim 3, characterized in that: Along the axial direction of the main body, the lengths of the plurality of holes are the same.

5. The rotary ultrasonic testing sample rod according to any one of claims 1 to 4, characterized in that: A first hole and a second hole are formed in the main body.

6. The rotary ultrasonic testing sample rod according to claim 5, characterized in that: The distance between the first hole and the surface of the main body is 10% of the diameter of the main body, and the distance between the second hole and the surface of the main body is 30% of the diameter of the main body.

7. The rotary ultrasonic testing sample rod according to claim 5, characterized in that: The plane where the axis of the first hole body and the axis of the main body lie is a first plane, the plane where the axis of the second hole body and the axis of the main body lie is a second plane, and the first plane is perpendicular to the second plane.

8. A method for manufacturing an ultrasonic detection DAC, implemented using the rotating ultrasonic detection sample rod according to any one of claims 1 to 7, characterized in that: include: introducing the rotary ultrasonic testing sample rod into the rotary ultrasonic cavity; Turning on the coupled water supply and the rotation of the ultrasonic cavity so that the ultrasonic detection probe rotates around the rotating ultrasonic detection sample rod, and the interface reflection signal and the bottom surface reflection signal of the rotating ultrasonic detection sample rod appear on the instrument display; The rotating ultrasonic testing rod is axially moved so that the cross section of the axial center of the hole body reaches the cross section of the rotating scanning of the ultrasonic testing probe, and a combined hole body reflection signal appears between the interface reflection signal and the bottom surface reflection signal; Scanning the plurality of holes and generating a plurality of closest reflection signals and a farthest reflection signal; Multiple reflection signals are displayed on the instrument screen according to the scanning sound path from near to far. At the same time, the amplitude of each signal decreases as the scanning sound path increases. The sensitivity is adjusted so that the amplitude of the reflection signal of the horizontal hole in the closest sound path reaches 80%. The amplitudes of the horizontal holes in the remaining sound paths change accordingly. The highest point of each signal amplitude is fitted to form the DAC curve. Taking the amplitude of the most recent reflected signal when scanning the first hole as a benchmark, adjust the sensitivity compensation of subsequent signals to make the amplitudes of each signal consistent. The sensitivity compensation amplitude of each sound path signal forms a DAC compensation curve. At this time, the equipment has the same detection sensitivity for the holes of the same specifications at different depths in the rotating ultrasonic testing sample rod.

9. The method for manufacturing an ultrasonic detection DAC according to claim 8, characterized in that: The step of scanning the plurality of holes and forming a plurality of closest reflection signals and a farthest reflection signal comprises: A first hole and a second hole are formed in the main body. The ultrasonic detection probe scans the first hole to form a first closest reflection signal and a first farthest reflection signal; the ultrasonic detection probe scans the second hole to form two closest reflection signals and two farthest reflection signals.

10. The method for manufacturing an ultrasonic detection DAC according to claim 8, wherein: The steps before introducing the rotary ultrasonic detection sample rod into the rotary ultrasonic cavity include: The rotating ultrasonic testing sample rod is introduced into the rotating ultrasonic cavity and the concentricity is ensured, and the scanning display sound path range and sensitivity are preliminarily set.

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