A round steel internal defect positioning device and method

Abstract

The application relates to a round steel internal defect positioning device and method, and the positioning device comprises a clamp, a rectangular rod, a circular sleeve, a movable rod, a rectangular sleeve and a U-shaped positioning rod; for the round steel with internal defects invisible to the naked eye, one of the sawed surfaces is used for low-magnification inspection of the defects, and the other surface is used for microscopic analysis such as metallography and scanning electron microscopy; the round steel internal defect positioning device can quickly and accurately determine the defect position.

Description

Technical Field

[0001] This invention relates to the field of testing and analysis technology, and in particular to a device and method for locating internal defects in round steel. Background Technology

[0002] Common internal defects in round steel bars include cracks, porosity, shrinkage cavities, inclusions, white spots, and delamination. These internal defects can lead to problems such as reduced strength, fatigue failure, brittle fracture, or accelerated corrosion when the round steel bars are used. Non-destructive testing techniques are usually used to detect them to ensure that the quality of the round steel bars meets industry standards.

[0003] When internal defects are found in round steel after flaw detection, a sample needs to be cut at the defect location to observe the defect at the cross-section. Because the defects are small, some may be invisible to the naked eye, necessitating low-magnification inspection for clearer observation. To further clarify the cause of the defect, microscopic analysis such as metallography and scanning electron microscopy is generally required. However, the inspection surface after low-magnification inspection is acid-etched and cannot be subjected to metallographic or scanning electron microscopy. Therefore, defect sampling and analysis must be performed on the symmetrical surface of the low-magnification inspection surface after sawing. Since the defect is difficult to observe with the naked eye at this point, it is necessary to first determine its location. Under these circumstances, this invention proposes a method for locating internal defects in round steel. Summary of the Invention

[0004] This invention provides a device and method for locating internal defects in round steel. For round steel with internal defects invisible to the naked eye, one side after sawing is used for low-magnification inspection of the defects, and the other side is used for microscopic analysis of the defects such as metallography and scanning electron microscopy. The device for locating internal defects in round steel can quickly and accurately determine the location of the defects.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A device for locating internal defects in round steel includes clamps, rectangular rods, circular sleeves, movable rods, rectangular sleeves, and U-shaped positioning rods. Two clamps are included, each consisting of a clamp body and a connecting component. The clamp body includes a connected retaining ring and a connecting rod. The retaining ring is fitted over the round steel sample and locked by the connecting component. One end of the connecting rod is connected to the retaining ring, and the other end has a rectangular hole. The two clamps are arranged side-by-side, and the rectangular rod passes through the rectangular holes on the two connecting rods. The circular sleeve is detachably fixed to the rectangular rod. The movable rod passes through the circular sleeve, and rectangular sleeves are provided at both ends of the movable rod. The U-shaped positioning rod consists of one horizontal rod and two vertical rods. The two vertical rods have rectangular cross-sections that mate with the rectangular sleeves, and the vertical rods are slidably connected to their corresponding rectangular sleeves.

[0007] The clip is made of stainless steel.

[0008] The connector consists of a connecting screw and a nut.

[0009] The bottom ends of the crossbar extend downwards to form pointed pointers.

[0010] A method for locating internal defects in round steel bars includes the following steps:

[0011] 1) For round steel samples that are found to have internal defects after flaw detection, fix them side by side with two clamps on both sides of the location of the internal defect. When fixing, pass a rectangular rod through the rectangular hole on the two clamps to ensure that the two clamps are in the same position along the circumference of the round steel sample.

[0012] 2) Remove the rectangular rod and cut the round steel sample into two sections at the location of the internal defect, to obtain round steel sample one and round steel sample two; observe the defect at the cross section. When the defect cannot be directly observed with the naked eye, take round steel sample one for low magnification inspection. After acid corrosion, the defect is exposed on the cross section of round steel sample one.

[0013] 3) After the low-magnification inspection, place the cross-sections of round steel sample one and round steel sample two side by side with their ends facing each other. Pass the rectangular rod back through the rectangular holes on the two clamps. After installing the movable rod, rectangular sleeve and U-shaped positioning rod, press the cylindrical sleeve tightly against the bottom of the rectangular rod between the two round steel samples. Adjust the positions of round steel sample one and round steel sample two so that their inner end faces are in contact with the two ends of the U-shaped positioning rod. Then rotate the movable rod to adjust the angle of the U-shaped positioning rod. Slide the U-shaped positioning rod along the rectangular sleeve to adjust the position of the crossbar so that one end of the crossbar is aligned with the low-magnification inspection defect on round steel sample one. At this time, the other end of the crossbar is naturally aligned with the defect on round steel sample two. Mark the defect on round steel sample two with a marker.

[0014] 4) Take out the second round steel sample, cut a microscopic inspection sample at the marked defect location, and perform microscopic inspection and analysis after grinding and polishing.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1) For round steel samples with internal defects invisible to the naked eye, cut them into two sections. One section is used for low-magnification inspection of the defects, and the other section is used for microscopic analysis of the defects, such as metallography and scanning electron microscopy.

[0017] 2) By matching and locating low-magnification inspection defects with microscopic inspection defects, the location of defects used for microscopic inspection can be quickly and accurately determined, thereby successfully preparing microscopic inspection samples that meet the analytical requirements of metallography, scanning electron microscopy, etc., improving the sampling success rate, as well as the efficiency and accuracy of inspection and analysis.

[0018] 3) The internal defect locating device of round steel can be used to conveniently, quickly and accurately determine the location of defects for microscopic inspection. The internal defect locating device of round steel has a simple structure and is easy to operate and use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the usage state of the round steel internal defect locating device described in this invention. Figure 1 .

[0020] Figure 2 This is a schematic diagram of the usage state of the round steel internal defect locating device described in this invention. Figure 2 .

[0021] Figure 3 This is a schematic diagram of the movable rod and rectangular sleeve described in this invention.

[0022] Figure 4 This is a schematic diagram of the sampling location of internal defects in the un-low-magnification acid-etched sample described in this invention.

[0023] In the figure: 1. Round steel sample 1-1. Round steel sample one 1-2. Round steel sample two 2. Clamp body 3. Connector 4. Rectangular hole 5. Rectangular rod 6. Low magnification inspection of defects 7. Circular sleeve 8. Movable rod 9. Rectangular sleeve 10. U-shaped positioning rod 11. Mark 12. Microscopic inspection sample Detailed Implementation

[0024] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0025] like Figures 1-3 As shown, the present invention discloses a device for locating internal defects in round steel, comprising clamps, a rectangular rod 5, a circular sleeve 7, a movable rod 8, a rectangular sleeve 9, and a U-shaped positioning rod 10. Two clamps are included, each consisting of a clamp body 2 and a connecting member 3. The clamp body 2 includes a connected retaining ring and a connecting rod. The retaining ring is fitted over the round steel sample 1 and locked by the connecting member 3. One end of the connecting rod is connected to the retaining ring, and the other end has a rectangular hole 4. The two clamps are arranged side-by-side, and the rectangular rod 5 passes through the rectangular holes 4 on the two connecting rods. The circular sleeve 7 is close to the rectangular rod 5, and the movable rod 8 passes inside the circular sleeve 7. Rectangular sleeves 9 (such as...) are provided at both ends of the movable rod 8. Figure 3 As shown), the U-shaped positioning rod 10 consists of one horizontal bar and two vertical bars. The two vertical bars have rectangular cross sections that mate with the rectangular sleeve 9, and the vertical bars are slidably connected to the corresponding rectangular sleeve 9.

[0026] The clip is made of stainless steel.

[0027] The connector 3 consists of a connecting screw and a nut.

[0028] The bottom ends of the crossbar extend downwards to form pointed pointers.

[0029] The present invention provides a method for locating internal defects in round steel bars, comprising the following steps:

[0030] 1) For the round steel sample 1, which is confirmed to have internal defects after flaw detection, two clamps are used side by side on both sides of the location of the internal defect to fix it. During fixing, a rectangular rod 5 passes through the rectangular holes 4 on the two clamps to ensure that the two clamps are in the same position along the circumference of the round steel sample 1 (e.g., Figure 1 (as shown)

[0031] 2) Remove the rectangular rod 5, and cut the round steel sample 1 into two sections at the location of the internal defect to obtain round steel sample 1-1 and round steel sample 2-2; observe the defect at the cross section. When the defect cannot be directly observed with the naked eye, take round steel sample 1-1 for low magnification inspection. After acid corrosion, the low magnification inspection defect 6 is exposed on the cross section of round steel sample 1-1.

[0032] 3) After the low-magnification inspection, place the cross-sections of round steel sample 1-1 and round steel sample 2-2 side by side with their surfaces facing each other. Pass the rectangular rod 5 back through the rectangular holes 4 on the two clamps. Place the circular sleeve 7, after installing the movable rod 8, rectangular sleeve 9, and U-shaped positioning rod 10, against the bottom of the rectangular rod 5 between round steel sample 1-1 and round steel sample 2-2. Adjust the positions of round steel sample 1-1 and round steel sample 2-2 so that their inner end faces contact the corresponding ends of the U-shaped positioning rod 10. Then, rotate the movable rod 8 to adjust the angle of the U-shaped positioning rod 10. Next, slide the U-shaped positioning rod 10 along the rectangular sleeve 9 to adjust the position of the crossbar, aligning one end of the crossbar with the low-magnification inspection defect 6 on round steel sample 1-1. At this time, the other end of the crossbar should naturally align with the defect location on round steel sample 2-2 (e.g., ...). Figure 2 As shown in the figure, mark the defect on the round steel sample 1-2 with a marker.

[0033] 4) Remove round steel sample 1-2, and cut a microscopic inspection sample 12 at the marked defect location (e.g., Figure 4 As shown in the figure, after grinding and polishing, microscopic inspection and analysis were performed.

[0034] The present invention provides a method for locating internal defects in round steel bars. This method is based on a device for locating internal defects in round steel bars. The device is used to maintain the relative position of the cut round steel bar sample 1-1 and round steel bar sample 2-2, thereby enabling the rapid determination of the location of defects on the cross-section that are difficult to be observed by the naked eye.

[0035] Two clamps are fixed to the round steel sample 1, located on either side of the internal defect. The clamps are made of stainless steel and are reusable. The connecting rod on the clamp is connected to the rectangular rod 5 through the rectangular hole 4 to prevent positional deviation due to relative rotation. The clamp body 2 has a notch structure to accommodate round steel samples 1 of different diameters. The notch can be locked and fixed by the connector 3, which is existing technology and will not be described in detail here.

[0036] When performing low-magnification inspection, remove the rectangular rod 5, but keep one of the clips fixed on the round steel sample 1-1. Only in this way can the circumferential alignment be quickly performed through the rectangular rod 5 after the low-magnification inspection is completed.

[0037] The positioning assembly consists of a circular sleeve 7, a movable rod 8, a rectangular sleeve 9, and a U-shaped positioning rod 10. Based on achieving circumferential alignment, it can quickly determine the corresponding defect position on the cross section of the second round steel sample 1-2 by using the low-magnification inspection defect 6 on the cross section of the first round steel sample 1-1, so as to facilitate the cutting of the micro-inspection sample 12 for micro-inspection and analysis.

[0038] As a preferred option, the U-shaped positioning rod 10 has pointed pointers at both ends, which is beneficial for more accurate positioning.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for locating internal defects in round steel bars, implemented based on a device for locating internal defects in round steel bars, characterized in that, The internal defect locating device for round steel includes clamps, rectangular rods, circular sleeves, movable rods, rectangular sleeves, and U-shaped positioning rods. There are two clamps, each consisting of a clamp body and connecting parts. The clamp body includes a connected retaining ring and a connecting rod. The retaining ring is fitted over the round steel sample and locked by the connecting parts. One end of the connecting rod is connected to the retaining ring, and the other end has a rectangular hole. The two clamps are arranged side-by-side, with the rectangular rod passing through the rectangular holes on the two connecting rods. The circular sleeve is close to the rectangular rod, and the movable rod passes inside the circular sleeve. Rectangular sleeves are provided at both ends of the movable rod. The U-shaped positioning rod consists of one horizontal rod and two vertical rods. The two vertical rods have rectangular cross-sections that mate with the rectangular sleeves, and the vertical rods are slidably connected to the corresponding rectangular sleeves. The method for locating internal defects in round steel bars includes the following steps: 1) For round steel samples that are found to have internal defects after flaw detection, fix them side by side with two clamps on both sides of the location of the internal defect. When fixing, pass a rectangular rod through the rectangular hole on the two clamps to ensure that the two clamps are in the same position along the circumference of the round steel sample. 2) Remove the rectangular rod and cut the round steel sample into two sections at the location of the internal defect, to obtain round steel sample one and round steel sample two; observe the defect at the cross section. When the defect cannot be directly observed with the naked eye, take round steel sample one for low magnification inspection. After acid corrosion, the defect is exposed on the cross section of round steel sample one. 3) After the low-magnification inspection, place the cross-sections of round steel sample one and round steel sample two side by side with their ends facing each other. Pass the rectangular rod back through the rectangular holes on the two clamps. After installing the movable rod, rectangular sleeve and U-shaped positioning rod, press the circular sleeve against the bottom of the rectangular rod between round steel sample one and round steel sample two. Adjust the positions of round steel sample one and round steel sample two so that their inner end faces are in contact with the corresponding ends of the U-shaped positioning rod. Then rotate the movable rod to adjust the angle of the U-shaped positioning rod. Then slide the U-shaped positioning rod along the rectangular sleeve to adjust the position of the crossbar so that one end of the crossbar is aligned with the low-magnification inspection defect on round steel sample one. At this time, the other end of the crossbar is naturally aligned with the defect on round steel sample two. Mark the defect on round steel sample two with a marker. 4) Take out the second round steel sample, cut a microscopic inspection sample at the marked defect location, and perform microscopic inspection and analysis after grinding and polishing.

2. The method for locating internal defects in round steel according to claim 1, characterized in that, The clip is made of stainless steel.

3. The method for locating internal defects in round steel according to claim 1, characterized in that, The connector consists of a connecting screw and a nut.

4. The method for locating internal defects in round steel according to claim 1, characterized in that, The bottom ends of the crossbar extend downwards to form pointed pointers.

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