Round steel internal defect positioning device and method

Abstract

The invention relates to a round steel internal defect positioning device and method. 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 defects invisible to the naked eyes inside, one side of the sawed round steel is used for performing low-power inspection on the defects, the other side of the sawed round steel is used for performing metallographic analysis, scanning electron microscope analysis and other microscopic analysis on the defects, and the positions of the defects can be quickly and accurately determined by utilizing the round steel internal defect positioning device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection and testing, in particular to a round steel internal defect positioning device and method. BACKGROUND

[0002] Common internal defect types of round steel include cracks, pores, shrinkage, inclusions, white spots and delamination, etc. These internal defects may cause problems such as strength reduction, fatigue failure, brittle fracture or corrosion acceleration when the round steel is used. Non-destructive testing technology is usually used for detection to ensure that the quality of the round steel meets the industrial standards.

[0003] When the round steel is found to have internal defects after flaw detection, the sample needs to be sawn at the flaw detection position to observe the defect condition at the cross section. Since the defect is small, it cannot be observed by the naked eye, and low magnification inspection is usually required to clearly observe the defect condition. To further determine the cause of the defect, metallographic, scanning electron microscope and other microscopic inspection and analysis of the defect site are generally required. However, after acid corrosion of the inspection surface after low magnification inspection, metallographic, scanning electron microscope and other inspections cannot be performed, so sampling analysis of the defect is required on the symmetrical surface of the low magnification inspection surface after sawing. At this time, it is difficult to observe the defect with the naked eye, so the position of the internal defect needs to be determined first. Under this premise, the present application provides a round steel internal defect positioning method. SUMMARY

[0004] The present application provides a round steel internal defect positioning device and method. For round steel with internal defects that cannot be seen by the naked eye, one of the surfaces after sawing is used for low magnification inspection of the defect, and the other surface is used for microscopic analysis of the defect such as metallographic, scanning electron microscope, etc. The round steel internal defect positioning device can quickly and accurately determine the position of the defect.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A round steel internal defect positioning device, comprising clamps, a rectangular rod, a circular sleeve, a movable rod, a rectangular sleeve and a U-shaped positioning rod; the clamps are two, composed of a clamp body and a connecting piece, the clamp body includes a clamping ring and a connecting rod connected together, the clamping ring is sleeved on the outside of the round steel sample and locked by the connecting piece, one end of the connecting rod is connected with the clamping ring, and the other end is provided with 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 fixedly connected with the rectangular rod, the movable rod is arranged in the circular sleeve, and the two ends of the movable rod are respectively provided with a rectangular sleeve; the U-shaped positioning rod is composed of one horizontal rod and two vertical rods, the two vertical rods have a rectangular cross section matched with the rectangular sleeve, and the vertical rod is slidably connected with the corresponding rectangular sleeve.

[0007] The clamps are made of stainless steel.

[0008] The connecting piece is composed of a connecting screw rod and a nut.

[0009] The bottom of the two ends of the crossbar extends downward to form a sharp corner pointer.

[0010] A round steel internal defect positioning method comprises the following steps:

[0011] 1) After flaw detection, determine the round steel sample with internal defects, fix two clamps side by side on both sides of the internal defect, and ensure that the two clamps are in the same position along the circumference of the round steel sample by passing a rectangular rod through the rectangular holes in the two clamps during fixation;

[0012] 2) Remove the rectangular rod, cut the round steel sample at the internal defect to obtain round steel sample one and round steel sample two; observe the defect at the cross section, and when the defect cannot be directly observed with the naked eye, perform low-magnification inspection on the round steel sample one, and the low-magnification inspection defect is exposed on the cross section of the round steel sample one after acid corrosion;

[0013] 3) After low-magnification inspection, place the cross sections of the round steel sample one and the round steel sample two opposite to each other, pass the rectangular rod through the rectangular holes in the two clamps again, and place the cylindrical sleeve with the installed movable rod, rectangular sleeve and U-shaped positioning rod close to the bottom of the rectangular rod between the two round steel samples; adjust the positions of the round steel sample one and the round steel sample two so that the inner end faces of the two round steel samples are in contact with the two ends of the U-shaped positioning rod respectively, 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, align one end of the crossbar with the low-magnification inspection defect on the round steel sample one, and the other end of the crossbar is naturally aligned with the defect position on the round steel sample two, then mark the defect position on the round steel sample two with a marker;

[0014] 4) Remove the round steel sample two, cut a micro-inspection sample at the marked defect position, and perform micro-inspection analysis after grinding and polishing treatment.

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

[0016] 1) For the round steel sample with internal defects invisible to the naked eye, the sample is cut into two sections, one section of which is used for low-magnification inspection of the defect, and the other section is used for micro-analysis such as metallography and scanning electron microscopy;

[0017] 2) By matching and positioning the low-magnification inspection defect and the micro-inspection defect, the defect position for micro-inspection can be quickly and accurately determined, thereby successfully preparing a micro-inspection sample meeting the analysis requirements of metallography, scanning electron microscopy and the like, and improving the success rate of sampling, 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 of the two ends of the crossbar extends downward to form a sharp corner pointer.

[0029] The round steel internal defect positioning method comprises the following steps:

[0030] 1) After flaw detection, determine the round steel sample 1 with internal defects, fix the two clamps side by side on both sides of the position where the internal defects are located, and ensure that the two clamps are in the same position along the circumference of the round steel sample 1 by passing the rectangular rod 5 through the rectangular hole 4 on the two clamps (as shown in Figure 1 );

[0031] 2) Remove the rectangular rod 5, cut the round steel sample 1 into two sections at the position where the internal defects are located, and obtain the round steel sample 1-1 and the round steel sample 1-2; observe the defect condition at the cross section, and when the defect cannot be directly observed by the naked eye, take the round steel sample 1-1 for macroscopic examination, and the macroscopic examination defect 6 is exposed on the cross section of the round steel sample 1-1 after acid corrosion;

[0032] 3) After the macroscopic examination is completed, place the cross sections of the round steel sample 1-1 and the round steel sample 1-2 side by side, pass the rectangular rod 5 through the rectangular hole 4 on the two clamps again; place the circular sleeve 7 after installing the movable rod 8, the rectangular sleeve 9 and the U-shaped positioning rod 10 close to the bottom of the rectangular rod 5 between the round steel sample 1-1 and the round steel sample 1-2; adjust the positions of the round steel sample 1-1 and the round steel sample 1-2 so that the inner end faces of the two are in contact with 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, and then slide the U-shaped positioning rod 10 along the rectangular sleeve 9 to adjust the position of the crossbar, so that one end of the crossbar is aligned with the macroscopic examination defect 6 on the round steel sample 1-1, and the other end of the crossbar is naturally aligned with the defect position on the round steel sample 1-2 (as shown in Figure 2 ), and mark the defect on the round steel sample 1-2 with a marker 11;

[0033] 4) Remove the round steel sample 1-2, cut the micro-examination sample 12 at the marked defect position (as shown in Figure 4 ), and perform micro-examination analysis after grinding and polishing treatment.

[0034] The round steel internal defect positioning method is realized based on a round steel internal defect positioning device, and the relative position relationship between the cut round steel sample 1-1 and the round steel sample 1-2 is maintained by using the round steel internal defect positioning device, so that the position of the defect that cannot be observed by the naked eye on the cross section can be quickly determined.

[0035] 2 clamps are fixed on the round steel sample 1, and are located on both sides of the internal defect; the clamp is made of stainless steel material, and can be reused. The connecting rod on the clamp is connected with the rectangular rod 5 through the rectangular hole 4, so as to prevent the position deviation caused by relative rotation. The clamp body 2 has a notch structure to adapt to the round steel sample 1 with different diameters, and the notch can be locked and fixed through the connecting piece 3, which is the prior art and will not be described here.

[0036] When doing low magnification inspection, the rectangular rod 5 is removed, and one of the clamps is still fixed on the round steel sample 1-1, so that after the low magnification inspection is finished, the circumferential alignment can be quickly performed through the rectangular rod 5.

[0037] The positioning assembly composed of the circular sleeve 7, the movable rod 8, the rectangular sleeve 9 and the U-shaped positioning rod 10 can quickly determine the corresponding defect position on the cross section of the round steel sample 2 1-2 on the basis of realizing the circumferential alignment, so as to facilitate the micro inspection analysis of the micro inspection sample 12.

[0038] As a preferred, the two ends of the U-shaped positioning rod 10 are provided with sharp-pointed pointers, which are beneficial to more accurate positioning.

[0039] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A device for locating internal defects in round steel bars, characterized in that, The device 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 located 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.

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

3. The device 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 device 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.

5. A method for locating internal defects in round steel bars, implemented based on the round steel bar internal defect locating device as described in any one of claims 1 to 4; characterized in that, 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.

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