Tool for preparing metallographic specimen

Abstract

The utility model discloses a tool for preparing a metallographic specimen, and relates to the technical field of material testing. According to the technical key points, the device comprises an annular base, and a grinding assembly is arranged over the annular base; two moving blocks symmetrical about the grinding assembly are installed in an annular groove of the annular base, stand columns are fixedly installed at the upper ends of the moving blocks, the upper ends of the two stand columns are connected through a horizontal guide rod, and a sliding block is movably installed on the guide rod. And a metal sample pressing unit capable of enabling the metallographic sample to freely move in the vertical direction when the metallographic sample is ground is movably mounted on one side of the sliding block. Movement of the metallographic specimen can be assisted and guided through the guide rod, the sliding block, the metallographic specimen pressing unit and other components, and therefore the risk that the metallographic specimen is damaged due to poor control of experimenters in the grinding process is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of material testing, and in particular to a tool for preparing metallographic samples. Background Art

[0002] Metallographic examination primarily employs the principles of quantitative metallography, using measurements and calculations of the metallographic microstructure of two-dimensional metallographic specimens or thin films to determine the three-dimensional spatial morphology of alloy structures, thereby establishing quantitative relationships between alloy composition, structure, and properties. To clearly observe the internal microstructure of metals under a metallographic microscope, meticulous metallographic specimen preparation is required. The metallographic specimen preparation process includes sampling, grinding, polishing, and etching. Metallographic specimens can be ground either mechanically or manually. Mechanical grinding utilizes specialized mechanical equipment to automatically grind the specimen. This method increases efficiency and, because it eliminates manual intervention, reduces polishing errors and damage caused by human factors. The precision and flatness of the ground surface are superior to those of manual grinding, making it of great significance for large-scale processing. However, mechanically ground specimens also have some drawbacks. Firstly, mechanical grinding is not as effective as manual grinding for repairing minor sample chips and defects. Mechanical grinding can damage complex specimen shapes, unique unit structures, and handling. Secondly, mechanical polishing equipment is expensive and requires a large investment, making it uneconomical for small-scale preparations. Manual grinding, on the other hand, can effectively solve these problems by adjusting the force and speed according to human intuition and experience. Therefore, many laboratories still use manual grinding to process metallographic specimens.

[0003] When manually grinding a metallographic specimen, the experimenter first prepares multiple sheets of coarse, medium, and fine sandpaper and the specimen. The experimenter then spreads the coarse sandpaper flat on a flat laboratory table, and then repeatedly grinds the specimen end face on the sandpaper surface by pressing the sandpaper with one hand and pinching the specimen with the other hand, pushing it forward. However, this method is not easy to control the angle between the specimen and the sandpaper during grinding, and it is easy to grind the specimen end face into an inclined surface. If this is not discovered in time, the metallographic specimen will be damaged. Therefore, it is urgent to propose a tool that can control the morphology of the metallographic specimen during the manual grinding process. Utility Model Content

[0004] The present application provides a tool for preparing metallographic samples, which can effectively solve the problem that the angle of the sample is difficult to control during the manual grinding process of the metallographic sample.

[0005] The above-mentioned purpose of this application is achieved through the following technical solutions:

[0006] A tool for preparing a metallographic sample, comprising an annular base, with a grinding assembly provided just above the annular base, the grinding assembly being used for grinding and polishing the end of the metallographic sample;

[0007] An annular groove is provided on the edge of the upper end of the annular base along its circumference, and two moving blocks symmetrical with respect to the grinding assembly are installed in the annular groove, and a column is fixedly installed on the upper end of the moving block;

[0008] The upper ends of the two uprights are connected by a horizontal guide rod, on which a slider is movably mounted, and the slider can move freely on the guide rod;

[0009] A metallographic sample pressing unit is movably mounted on one side of the slider, and a metallographic sample is mounted on the lower end of the metallographic sample pressing unit. The metallographic sample pressing unit can enable the metallographic sample to move freely in the vertical direction when grinding the metallographic sample.

[0010] Furthermore, the metallographic sample pressing unit includes a sleeve connected to the slider, a pressing rod is inserted into the sleeve and the two are slidably connected, the upper end of the pressing rod is fixedly connected to a spherical handle, and the lower end of the pressing rod is fixedly connected to a sample mounting plate.

[0011] Furthermore, the guide rod includes two first pins, and the two first pins are respectively passed through the upper ends of the two columns in the horizontal direction. The ends of the two first pins close to each other are respectively fixedly connected with a biasing rod, and the two biasing rods are fixedly connected by a square tube at one end away from the first pin at their corresponding positions, and the axis of the square tube is located on one side of the axis of the first pin in the horizontal direction. A square hole matching the cross-sectional shape of the square tube is provided on the slider, and the slider is slidably mounted on the square tube through the square hole.

[0012] Furthermore, the first pin shaft is rotatably connected to the column at the corresponding position, and a first adjusting bolt is inserted directly above the column. The first adjusting bolt is inserted downward from the top of the column into the through hole on the column for the first pin shaft to pass through, and the first adjusting bolt and the column are threadedly connected.

[0013] Furthermore, the sleeve in the pressing unit is fixedly connected to a second pin on a side close to the slider, and the second pin passes through the slider and is rotatably connected therebetween;

[0014] A threaded line is provided on the outer side of one end of the second pin away from the sleeve, and an adjusting knob is sleeved on the portion of the second pin with the threaded line, and the two are threadedly connected.

[0015] Furthermore, the moving block is slidably connected to the annular groove, and the moving block can slide freely inside the annular groove along the circumference thereof. A second adjusting bolt is provided above the moving block, and a plurality of fixing holes are evenly provided on the bottom plate of the annular groove along the circumference. The bolt body of the second adjusting bolt passes downward through the moving block and is inserted into the fixing hole at the corresponding position, and the second adjusting bolt is threadedly connected to the fixing hole.

[0016] Furthermore, the column is an inverted V-shaped structure, and the second adjusting bolt is located on the moving block at a middle position between the two ends of the opening side of the column.

[0017] Furthermore, the grinding assembly includes a circular sewage collecting shell, which is fixedly mounted on the annular base and the two are coaxially arranged. A metal grinding disc is coaxially arranged inside the sewage collecting shell, and the outer side of the metal grinding disc is fixedly connected to the sewage collecting shell through multiple fixing rods. The upper side of the metal grinding disc can be used to install sandpaper.

[0018] Furthermore, the upper edge of the metal grinding disc is evenly provided with a plurality of slots along the circumferential direction, and each of the slots is magnetically attracted with a positioning magnet, and the positioning magnet can fix the edge of the sandpaper through the magnetic attraction with the metal grinding disc.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] When the experimenter needs to grind the metallographic specimen, he first installs the metallographic specimen on the metallographic specimen pressing unit of the present application, and then connects the metallographic specimen pressing unit and the slider. Since the guide rod on which the slider is mounted is in a horizontal state, when the experimenter pushes the metallographic specimen pressing unit to swing in the horizontal direction, the guide rod will guide the slider so that the metallographic specimen pressing unit as a whole is always in a horizontal state. In this way, when the experimenter uses the metallographic specimen pressing unit to grind on the grinding assembly, the metallographic specimen at its end can always be kept in a fixed position, thereby effectively avoiding the problem of specimen damage caused by the experimenter not grasping the angle well during the manual grinding of the metallographic specimen. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of this application;

[0023] Figure 2 This is a schematic diagram of the structure after the metallographic specimen pressing unit and the polishing assembly of the present application are disassembled and the inlay plate is turned upward;

[0024] Figure 3 This is a schematic diagram of the state of the metallographic specimen pressing unit of the present application when it rotates a certain angle around the axis of the first pin;

[0025] Figure 4 This is a schematic diagram of the state when the pressing rod of the present application is rotated around the axis of the second pin shaft by a certain angle.

[0026] Figure numerals: 1. annular base; 2. grinding assembly; 21. sewage collection shell; 22. metal grinding disc; 23. fixing rod; 24. sandpaper; 3. annular groove; 4. moving block; 5. column; 6. guide rod; 61. first pin; 62. offset rod; 63. square tube; 7. slider; 8. metallographic specimen pressing unit; 81. sleeve; 82. pressing rod; 83. spherical handle; 84. inlay plate; 9. first adjusting bolt; 10. second pin; 11. adjusting knob; 12. second adjusting bolt; 13. fixing hole; 14. slot; 15. positioning magnet. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of this application.

[0028] like Figure 1 and Figure 2 As shown, a tool for preparing metallographic samples disclosed in the present application comprises an annular base 1, a grinding assembly 2 is provided directly above the annular base 1, and the grinding assembly 2 can be used for grinding and polishing the end of the metallographic sample; an annular groove 3 is provided on the edge of the upper end of the annular base 1 along its circumference, and two moving blocks 4 symmetrical about the grinding assembly 2 are installed in the annular groove 3, and a column 5 is fixedly installed on the upper end of the moving block 4; the upper ends of the two columns 5 are connected by a horizontal guide rod 6, and a slider 7 is movably installed on the guide rod 6, and the slider 7 can move freely on the guide rod 6; a metallographic sample pressing unit 8 is movably installed on one side of the slider 7, and the metallographic sample is installed at the lower end of the metallographic sample pressing unit 8. The metallographic sample pressing unit 8 can make the metallographic sample move freely in the vertical direction when grinding the metallographic sample.

[0029] In the above embodiment, the annular base 1 of the present application not only provides a mounting base for the grinding assembly 2 above, but also provides the necessary support force for the two columns 5 through the laboratory table. The upper ends of the two columns 5 of the present application are connected by a horizontally arranged guide rod 6, and a slider 7 is movably mounted on the guide rod 6. This facilitates the experimenter to grind the sample. The slider 7 can move freely in the horizontal direction together with the metallographic sample pressing unit 8.

[0030] The traditional method of manually grinding a metallographic specimen is that the experimenter holds the metallographic specimen in his hand and grinds the end of the specimen by pushing it forward on the surface of the corresponding sandpaper 24. During the pushing process, the position of the experimenter's hand holding the metallographic specimen will gradually move away from the body, and the angle between the arm and the horizontal plane will gradually decrease, which will cause the direction of the force applied by the experimenter on the metallographic specimen to keep changing. If the experimenter does not have rich experience, it is easy for the experimenter to cause the metallographic specimen to be skewed and its end face to be damaged during the grinding process. At the very least, it will take more time to re-grind and adjust the end face of the specimen. At worst, the metallographic specimen may be damaged and it will be difficult to perform the next step.

[0031] When the experimenter uses the equipment of the present application to grind the metallographic sample, he first installs the metallographic sample on the metallographic sample pressing unit 8 of the present application, and then connects the metallographic sample pressing unit 8 and the slider 7. Since the guide rod 6 on which the slider 7 is mounted is in a horizontal state, when the experimenter pushes the metallographic sample pressing unit 8 to swing in the horizontal direction, the guide rod 6 will guide the slider 7 to keep the metallographic sample pressing unit 8 as a whole in a horizontal state. In this way, when the experimenter uses the metallographic sample pressing unit 8 to grind on the grinding assembly 2, the metallographic sample at its end can always be kept in a fixed position, thereby effectively avoiding the problem of sample damage caused by the experimenter not grasping the angle well during the manual grinding of the metallographic sample.

[0032] Furthermore, if Figure 1 and Figure 2 As shown, the metallographic sample pressing unit 8 includes a sleeve 81 connected to the slider 7, a pressing rod 82 is inserted into the sleeve 81 and the two are slidably connected, the upper end of the pressing rod 82 is fixedly connected to a spherical handle 83, and the lower end of the pressing rod 82 is fixedly connected to a sample mounting plate 84.

[0033] In the above embodiment, the sample mounting plate 84 of the present application has a pit. When polishing the metallographic sample, wax water can be injected into the pit first, and then the metallographic sample to be polished is placed in the wax water of the sample mounting plate 84. Before the wax water solidifies, the position and angle of the metallographic sample are adjusted so that the wax water can fix the metallographic sample in the sample mounting plate 84 as much as possible. Then, the end of the metallographic sample to be polished is directed to the bottom of the sample mounting plate 84 (the bottom is the side of the sample mounting plate 84 away from the pressing rod 82). When the pressing rod 82 is in use, The axis is perpendicular to the guide rod 6, and the pressing rod 82 is free to move in the vertical direction inside the sleeve 81 connected to the slider 7. In this way, the experimenter holds the spherical handle 83 and moves the pressing rod 82 downward first, so that the metallographic sample fixed under the sample mounting plate 84 contacts the grinding assembly 2. Finally, according to the traditional grinding method, the metallographic sample can be pushed to one side of the guide rod 6 by holding the spherical handle. After moving to the end, the metallographic sample is lifted and returned to the starting point. The above operation is repeated until the metallographic sample is polished to a qualified standard. The metallographic sample pressing unit 8 of the present application facilitates the experimenter to adjust the pressing force on the metallographic sample in the vertical direction when moving the metallographic sample along the guide rod 6. In order for the experimenter to better control the pressing force, a scale with numbers can be set on the outside of the pressing rod 82 along its axis direction, so that the experimenter can operate more conveniently.

[0034] Furthermore, if Figure 1 and Figure 2 As shown, the guide rod 6 includes two first pins 61, and the two first pins 61 are respectively passed through the upper ends of the two columns 5 in the horizontal direction. The ends of the two first pins 61 close to each other are fixedly connected with a biasing rod 62, and the two biasing rods 62 are fixedly connected by a square tube 63 at one end away from the first pins 61 at their corresponding positions, and the axis of the square tube 63 is located on one side of the axis of the first pin 61 in the horizontal direction. A square hole matching the cross-sectional shape of the square tube 63 is provided on the slider 7, and the slider 7 is movably slidably sleeved on the square tube 63 through the square hole.

[0035] In the above embodiment, the two offset rods 62 and the square tube 63 in the guide rod 6 of the present application can form a gate-shaped structure. In this way, when the entire guide rod 6 is in a horizontal state, the center of the sleeve 81 connected to the slider 7 on the square tube 63 can be as close as possible to the center of the grinding assembly 2. This can effectively increase the single-pass travel of the metallographic specimen when grinding on the grinding assembly 2, thereby improving grinding efficiency. The middle portion of the guide rod 6 is selected from the square tube 63, and the slider 7 is also provided with a corresponding square hole. This prevents the slider 7 from rotating around the square tube 63 when moving along the square tube 63, thereby affecting the grinding effect of the metallographic specimen. On the slider 7 of the present application, the position where it connects to the first pin 61 and the position where it connects to the square tube 63 are not coplanar. This prevents the first pin 61 and the square tube 63 from interfering with each other during use.

[0036] Furthermore, if Figure 1-Figure 3 As shown, the first pin shaft 61 is rotatably connected to the column 5 at the corresponding position, and a first adjusting bolt 9 is inserted directly above the column 5. The first adjusting bolt 9 is inserted downward from the top of the column 5 into the through hole on the column 5 for the first pin shaft 61 to pass through, and the first adjusting bolt 9 and the column 5 are threadedly connected.

[0037] In the above embodiment, the two first pins 61 of the present application are rotatably connected to the columns 5 at their respective corresponding positions. This makes it convenient to find that when the front and rear end faces of the metallographic specimen have deviations during grinding (in the present application, the metallographic specimen is along one opposite side perpendicular to the axis of the square tube 63, i.e., the front and rear sides thereof), Figure 3 As shown, the experimenter can rotate the guide rod 6 to tilt it toward the side that is not polished enough. After adjusting the angle, screw the first adjusting bolt 9. When the first adjusting bolt 9 presses the first pin 61 against the column 5 at the corresponding position, the first pin 61 can be clamped to achieve the fixing effect. In this way, the entire guide rod 6 can be maintained in the state after the angle is adjusted. When the experimenter grinds the metallographic sample along the square tube 63 in the guide rod 6, the insufficiently polished part can be re-polished.

[0038] Furthermore, if Figure 1 、 Figure 2 and Figure 4 As shown, the sleeve 81 in the pressing unit 8 is fixedly connected to the second pin 10 on the side close to the slider 7. The second pin 10 passes through the slider 7 and the two are rotatably connected.

[0039] A thread is provided on the outer side of one end of the second pin 10 away from the sleeve 81 , and an adjusting knob 11 is sleeved on the threaded portion of the second pin 10 and the two are threadedly connected.

[0040] In the above embodiment, the sleeve 81 of the present application is rotatably connected to the slider 7 via the second pin 10, wherein the axis of the second pin 10 is perpendicular to the axis of the first pin 61. In this way, when the left and right sides of the end face of the metallographic specimen are not polished uniformly (in the present application, the metallographic specimen is along the opposite side of the axis of the square tube 63, i.e., the left and right sides thereof), as shown in FIG. Figure 4As shown, the experimenter can drive the sleeve 81 with the second pin 10 to deflect to the side where the grinding is not in place, and the second pin 10 is provided with an external thread at one end away from the sleeve 81, and an adjusting knob 11 is threadedly connected to the part with the external thread. At this time, the sampler reduces the distance between the adjusting knob 11 and the sleeve 81 by turning the adjusting knob 11 until they exert an extrusion force on the slider 7. At this time, the sleeve 81 will form a stable connection relationship with the slider 7, so that the pressing rod 82 remains in the state after the angle is adjusted. When the sample is subsequently ground, the experimenter presses the pressing rod 82, and the part of the metallographic sample end face that is not ground in place will first contact the grinding assembly 2, so that the end of the metallographic sample can be corrected. Combined with the function of adjusting the angle of the front and rear sides of the metallographic sample in the previous embodiment, the tooling of the present application will be more flexible in adjusting the position of the metallographic sample when grinding the metallographic sample.

[0041] Furthermore, if Figure 1 and Figure 2 As shown, the moving block 4 is slidably connected to the annular groove 3, and the moving block 4 can slide freely inside the annular groove 3 along the circumference thereof. A second adjusting bolt 12 is provided above the moving block 4, and a plurality of fixing holes 13 are evenly provided on the bottom plate of the annular groove 3 along the circumference. The bolt body of the second adjusting bolt 12 penetrates downward through the moving block 4 and is inserted into the fixing hole 13 at the corresponding position, and the second adjusting bolt 12 is threadedly connected to the fixing hole 13.

[0042] In the above embodiment, a protrusion is provided on the inner side wall of the annular groove 3 of the present application along the circumferential direction, and a notch is provided on the movable block 4 that matches the cross-section of the protrusion. When the movable block 4 moves along the annular groove 3, the protrusion on the annular groove 3 can cooperate with the notch on the movable block 4 to restrict the movable block 4, so that the movable block 4 will not escape from the annular groove 3 from above. When grinding the specimen, the lower end of the second adjusting bolt 12 threadedly connected to the movable block 4 passes through the fixing hole 13 at the corresponding position on the plate of the annular groove 3 on the underside of the movable block 4 and is threaded together. In this way, when grinding the metallographic specimen, the movable block 4 will not shake in the annular groove 3, thereby affecting the grinding effect. If the moving block 4 remains stationary, the metallographic specimen will only move repeatedly in one area of ​​the grinding assembly 2, so that other areas of the grinding assembly 2 are not fully utilized. At this time, the experimenter can loosen the second adjusting bolt 12 on the moving block 4 to release the restriction on the moving block 4, rotate the two moving blocks 4 through the guide rod 6, and then re-fix them by screwing the second adjusting bolt 12, so that the metallographic specimen can be ground again in other areas of the grinding assembly 2, thereby effectively improving the utilization rate of the surface of the grinding assembly 2.

[0043] Furthermore, if Figure 1As shown, the column 5 is an inverted V-shaped structure, and the second adjusting bolt 12 is located on the moving block 4 at the middle position between the two ends of the opening side of the column 5.

[0044] In the above embodiment, the column 5 is set to an inverted V-shaped structure, so that after its open side is connected to the moving block 4, a sufficiently large installation space can be reserved for the second adjusting bolt 12 in the middle position of the moving block 4, so that the experimenter can tighten the second adjusting bolt 12 at any time as needed.

[0045] Furthermore, if Figure 1 and Figure 2 As shown, the grinding assembly 2 includes a circular sewage collecting shell 21, which is fixedly mounted on the annular base 1 and the two are coaxially arranged. A metal grinding disc 22 is coaxially arranged inside the sewage collecting shell 21. The outer side of the metal grinding disc 22 is fixedly connected to the sewage collecting shell 21 through multiple fixing rods 23. The upper side of the metal grinding disc 22 can be used to install sandpaper 24.

[0046] In the above embodiment, during the grinding process of the metallographic sample, it is inevitable that some hard particles on the surface of the sandpaper 24 will fall off or the sandpaper 24 will peel off some debris. If these impurities are not handled in time, they will easily scratch the surface of the metallographic sample. Therefore, during the grinding process, it is necessary to spray water on the sandpaper 24 and the metallographic sample on the metal grinding disc 22 through a water sprayer or a water pipe to clean away the impurities in time. The sewage collection shell 21 provided on the outside of the metal grinding disc 22 of the present application is located outside the metal grinding disc 22 on which the sandpaper 24 is installed. In this way, the sewage generated during the cleaning process will flow into the sewage collection shell 21. After the grinding is completed, it will be cleaned up in a centralized manner. This can prevent the turbulent flow of sewage from affecting the on-site experimental environment. In actual use, a sewage pipe can also be provided at the bottom of the sewage collection shell 21, and the sewage pipe can be connected to a special sewage channel in the laboratory, which can effectively reduce the subsequent cleaning burden. The shape of the metal grinding disc 22 of the present application is the same as that of the grinding disc in the mechanical grinding equipment, both of which are round, and they are similar in size. In this way, for some units that also have mechanical grinding equipment, when purchasing sandpaper 24, they can purchase sandpaper 24 of round specifications, which improves the convenience of purchase and use.

[0047] Furthermore, if Figure 1 and Figure 2 As shown, the upper edge of the metal grinding disc 22 is evenly provided with a plurality of slots 14 along the circumferential direction, and each slot 14 is magnetically attracted with a positioning magnet 15. The positioning magnet 15 can fix the edge of the sandpaper 24 through the magnetic attraction with the metal grinding disc 22.

[0048] In the above embodiment, the material of the metal grinding disc 22 at the positions of the multiple slots 14 of the present application is mainly iron, so when the positioning magnet 15 is placed on one of the slots 14, the two will be fixed together by magnetic attraction. When installing the sandpaper 24, the experimenter spreads the sandpaper 24 on the metal grinding disc 22 and places a positioning magnet 15 at each slot 14 of the metal grinding disc 22. The positioning magnet 15 can then use the magnetic attraction between it and the slot 14 to fix the sandpaper 24. Compared with gluing the sandpaper 24 to the metal grinding disc 22, this method adopted by the present application is more convenient to disassemble and will not leave residual glue on the metal grinding disc 22 that is difficult to clean.

[0049] The working principle of this embodiment is as follows: when the experimenter needs to manually grind the metallographic specimen, he first loosens the adjustment screw, removes the metallographic specimen pressing unit 8, and places the recessed side of the mounting plate 84 upward. The metallographic specimen to be ground is fixed on the specimen mounting plate 84 using wax liquid. At the same time, a piece of sandpaper 24 of appropriate specifications is placed on the metal grinding disc 22. After the sandpaper 24 is fixed using the positioning magnet 15, the metallographic specimen unit and the slider 7 on the guide rod 6 can be reconnected. After confirming that the square tube 63 in the guide rod 6 is in a horizontal position and the pressing rod 82 in the metallographic specimen pressing unit 8 is in a vertical position, the experimenter can manually press the spherical handle 83 to make the metallographic specimen contact with the sandpaper 24. While maintaining the pressure on the metallographic specimen, a certain horizontal thrust is applied to the metallographic specimen. In this way, the metallographic specimen can begin to be ground on the sandpaper 24. Compared with the method in the prior art whereby the experimenter grinds the sample by hand, the present application can assist in guiding the movement of the metallographic sample through components such as the guide rod 6, the slider 7, the sleeve 81 and the pressing rod 82, which can not only improve the quality, accuracy and efficiency of the grinding, but also reduce the risk of damage to the metallographic sample during the grinding process due to poor control by the experimenter.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A tool for preparing metallographic samples, characterized by: It comprises an annular base (1), a grinding assembly (2) is provided directly above the annular base (1), and the grinding assembly (2) can be used for grinding and polishing the end of a metallographic sample; An annular groove (3) is provided on the edge of the upper end of the annular base (1) along its circumference, and two moving blocks (4) symmetrical with respect to the grinding assembly (2) are installed in the annular groove (3), and a column (5) is fixedly installed on the upper end of the moving block (4); The upper ends of the two uprights (5) are connected via a horizontal guide rod (6), and a slider (7) is movably mounted on the guide rod (6), and the slider (7) can move freely on the guide rod (6); A metallographic sample pressing unit (8) is movably mounted on one side of the slider (7), a metallographic sample being mounted on the lower end of the metallographic sample pressing unit (8), and the metallographic sample pressing unit (8) can enable the metallographic sample to move freely in a vertical direction when grinding the metallographic sample.

2. The tool for preparing metallographic samples according to claim 1, characterized in that: The metallographic sample pressing unit (8) comprises a sleeve (81) connected to the slider (7), a pressing rod (82) is inserted into the sleeve (81) and the two are slidably connected, the upper end of the pressing rod (82) is fixedly connected to a spherical handle (83), and the lower end of the pressing rod (82) is fixedly connected to a sample mounting plate (84).

3. The tool for preparing metallographic samples according to claim 2, characterized in that: The guide rod (6) includes two first pin shafts (61), and the two first pin shafts (61) are respectively passed through the upper ends of the two columns (5) in the horizontal direction. The ends of the two first pin shafts (61) close to each other are respectively fixedly connected with a biasing rod (62). The two biasing rods (62) are fixedly connected by a square tube (63) at one end away from the first pin shaft (61) at their respective corresponding positions, and the axis of the square tube (63) is located on one side of the axis of the first pin shaft (61) in the horizontal direction. The slider (7) is provided with a square hole matching the cross-sectional shape of the square tube (63), and the slider (7) is movably slidably sleeved on the square tube (63) through the square hole.

4. The tool for preparing metallographic samples according to claim 3, characterized in that: The first pin shaft (61) is rotatably connected to the column (5) at the corresponding position, and a first adjusting bolt (9) is inserted directly above the column (5). The first adjusting bolt (9) is inserted downward from the top of the column (5) into a through hole on the column (5) for the first pin shaft (61) to pass through, and the first adjusting bolt (9) and the column (5) are threadedly connected.

5. The tool for preparing metallographic samples according to claim 4, characterized in that: The sleeve (81) in the pressing unit is fixedly connected to a second pin shaft (10) on a side close to the slider (7), and the second pin shaft (10) passes through the slider (7) and is rotatably connected therebetween; The outer side of one end of the second pin (10) away from the sleeve (81) is provided with a thread, and an adjusting knob (11) is sleeved on the portion of the second pin (10) provided with the thread, and the two are threadedly connected.

6. The tool for preparing a metallographic sample according to any one of claims 1 to 5, characterized in that: The movable block (4) is slidably connected to the annular groove (3), and the movable block (4) can slide freely inside the annular groove (3) along the circumference thereof. A second adjusting bolt (12) is provided above the movable block (4), and a plurality of fixing holes (13) are uniformly provided on the bottom plate of the annular groove (3) along the circumference. The bolt body of the second adjusting bolt (12) passes through the movable block (4) downward and is inserted into the fixing hole (13) at the corresponding position, and the second adjusting bolt (12) is threadedly connected to the fixing hole (13).

7. The tool for preparing metallographic samples according to claim 6, characterized in that: The column (5) is an inverted V-shaped structure, and the second adjusting bolt (12) is located on the moving block (4) at a middle position between the two ends of the opening side of the column (5).

8. The tool for preparing metallographic samples according to claim 1, characterized in that: The grinding assembly (2) comprises a circular sewage collecting shell (21), the circular sewage collecting shell (21) being fixedly mounted on the annular base (1) and the two being coaxially arranged, a metal grinding disc (22) being coaxially arranged inside the sewage collecting shell (21), the outer side of the metal grinding disc (22) being fixedly connected to the sewage collecting shell (21) via a plurality of fixing rods (23), and the upper side of the metal grinding disc (22) being used for mounting sandpaper (24).

9. The tool for preparing metallographic samples according to claim 8, characterized in that: The upper edge of the metal grinding disc (22) is evenly provided with a plurality of slots (14) along the circumferential direction, and a positioning magnet (15) is magnetically attracted in each of the slots (14). The positioning magnet (15) can fix the edge of the sandpaper (24) through the magnetic attraction with the metal grinding disc (22).

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