Clamping tool for grinding high-temperature metallographic test sample

Abstract

A clamping tool for grinding a high-temperature metallographic test sample belongs to the technical field of metallographic detection tools and is used for clamping the test sample. According to the technical scheme, a tool body is a steel cuboid, an adjusting screw hole penetrating through the tool body is formed between the two end faces of the tool body in the length direction, the central axis of the adjusting screw hole coincides with the central axis of the tool body in the length direction, and the diameter of the adjusting screw hole is matched with that of a high-temperature metallographic test sample; threads of the adjusting screw rod are matched with the adjusting screw hole of the tool body, the adjusting screw rod is screwed in the adjusting screw hole of the tool body, the lower end of the adjusting screw rod is fixedly provided with the adsorption magnet, the diameter of the adsorption magnet is matched with the diameter of the adjusting screw rod, and the upper end face of the adjusting screw rod is provided with a cross-shaped groove for rotating the adjusting screw rod. The clamp is simple in structure, convenient to use and capable of clamping and fixing small-size samples, grinding, polishing and other working procedures can be rapidly completed after clamping, the working efficiency is effectively improved, and the samples can be prevented from falling off in the operation process.

Description

Technical Field

[0001] The utility model relates to a tool for clamping a test sample during the grinding of a high-temperature metallographic test sample, and belongs to the technical field of metallographic detection tools. Background Art

[0002] The basic principle of high-temperature metallographic detection is to heat a sample that has been ground to a mirror state under a vacuum state through an external heating stage, and directly observe the microstructural changes of metals and alloys as the temperature rises or falls through a microscope lens close to the sample, such as recrystallization, crystal nucleus growth, and secondary phase precipitation. Therefore, the grinding of high-temperature metallographic samples is different from that of ordinary metallographic samples. The biggest difference is that the size of high-temperature metallographic samples is very small and basically fixed. When grinding high-temperature metallographic samples, they need to be ground with 180-1200# sandpaper like ordinary metallographic test samples, and at the same time, they need to be polished with 1-3 micron diamond polishing fluid to make the inspection surface present a mirror state. In addition to the above requirements, it is generally required that the diameter and thickness of the finished sample are both ≤ 4 mm.

[0003] To prepare high-temperature test samples that meet the above requirements, the following problems need to be solved:

[0004] 1. How to clamp a sample with too small a size; 2. How to improve the quality of the ground sample; 3. How to prevent the sample from falling off and causing mechanical injury accidents.

[0005] To solve the above problems, the current industry-wide general solution is as follows: First, expand the sample size by embedding, and then try to take it out after the sample preparation is completed to solve the problem of clamping the sample; second, appropriately increase the sample size and use manual grinding to improve the grinding quality; third, stick the sample to other samples with glue and then try to remove it. However, the above solutions all have obvious defects. For example, the embedding method well solves the problem of sample polishing, but most of the embedding materials are epoxy resins with high strength and are very difficult to take out; deliberately increasing the sample size puts higher requirements on the working efficiency of the heating stage and vacuum maintenance, which is difficult to achieve. Especially because the sample size increases, the heat radiation amount significantly increases, and the damage to the microscope also increases accordingly; the method of glue sticking is likely to cause the sample to fall off or the sample is not easy to take off due to improper operation or glue selection. The metal sample that falls off during high-speed grinding may cause harm to personnel and equipment.

[0006] In summary, the current technical solutions for clamping high-temperature metallographic test samples all have obvious defects and cannot meet the requirements of high-temperature metallographic tests. It is very necessary to improve them. Content of the Utility Model

[0007] The technical problem to be solved by the present utility model is to provide a clamping tool for grinding high-temperature metallographic test samples. This clamping tool can clamp and fix small-sized high-temperature metallographic test specimens, and after clamping, it can quickly complete processes such as grinding and polishing, effectively improving work efficiency, and can prevent the test specimens from falling off during operation, preventing the occurrence of safety accidents.

[0008] The technical solution for solving the above technical problem is as follows:

[0009] A clamping tool for grinding high-temperature metallographic test samples, which includes a tool body, an adjusting screw, and an adsorption magnet. The tool body is a steel rectangular parallelepiped, and the length direction of the tool body is perpendicular to the grinding workbench. There is an adjusting screw hole passing through the tool body between the two end faces in the length direction of the tool body. The central axis of the adjusting screw hole coincides with the central axis of the length direction of the tool body. The diameter of the adjusting screw hole matches the diameter of the high-temperature metallographic test sample. The thread of the adjusting screw matches the adjusting screw hole of the tool body. The adjusting screw is screwed into the adjusting screw hole of the tool body. The lower end of the adjusting screw is fixedly connected with the adsorption magnet. The diameter of the adsorption magnet matches the diameter of the adjusting screw. There is a cross groove on the upper end face of the adjusting screw for rotating the adjusting screw.

[0010] For the above clamping tool for grinding high-temperature metallographic test samples, an anti-wear plate is connected to the lower end in the length direction of the tool body. The anti-wear plate is rectangular, and the shape of the anti-wear plate matches the lower end face in the length direction of the tool body. There is a round hole in the center of the anti-wear plate. The round hole is opposite to the adjusting screw hole of the tool body, and the diameter of the round hole is the same as that of the adjusting screw hole of the tool body. There are fixing holes on both sides of the round hole of the anti-wear plate, and there are corresponding fixing screw holes on the lower end face of the tool body. The fixing screw fixedly connects the anti-wear plate and the lower end face of the tool body.

[0011] For the above clamping tool for grinding high-temperature metallographic test samples, the sum of the thickness of the adsorption magnet and the length of the adjusting screw is equal to the sum of the length of the tool body and the thickness of the anti-wear plate.

[0012] The beneficial effects of the present utility model are as follows:

[0013] There is an adjusting screw hole passing through the length direction on the tool body of the present utility model. The adjusting screw is screwed into the adjusting screw hole, and the front end of the adjusting screw is fixedly connected with the adsorption magnet. The diameter of the adjusting screw hole matches the diameter of the high-temperature metallographic test sample. The adsorption magnet can adsorb the test sample and move up and down in the adjusting screw hole along with the adjusting screw. The adjusting screw sends the test sample out about 1 millimeter from the lower end face of the tool body, and then grinding and polishing can be carried out. By adjusting and observing the length of the upper end of the bolt exposed, the remaining thickness of the test sample can be estimated. When grinding to the appropriate thickness, stop the processing, and only need to turn the adjusting bolt to quickly remove the test sample.

[0014] The utility model has a simple structure and is convenient to use. It can clamp and fix small-sized high-temperature metallographic specimen samples. After clamping, processes such as grinding and polishing can be quickly completed, effectively improving work efficiency, and preventing the specimen from falling off during operation, thus preventing the occurrence of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural view of the utility model;

[0016] Figure 2 is Figure 1 the top view of

[0017] The markings in the figure are as follows: tool body 1, adjusting screw hole 2, adjusting screw 3, adsorption magnet 4, wear-resistant plate 5, fixing screw 6, cross groove 7, test sample 8. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The utility model is composed of a tool body 1, an adjusting screw hole 2, an adjusting screw 3, an adsorption magnet 4, a wear-resistant plate 5, and a fixing screw 6.

[0019] As shown in the figure, the tool body 1 is a steel rectangular parallelepiped made of 316 stainless steel, and the length direction of the tool body 1 is perpendicular to the grinding workbench. There is an adjusting screw hole 2 passing through the tool body 1 between the two end faces in the length direction of the tool body 1. The central axis of the adjusting screw hole 2 coincides with the central axis of the tool body 1 in the length direction. The diameter of the adjusting screw hole 2 matches the diameter of the test sample 8 and is slightly larger than the diameter of the test sample 8.

[0020] As shown in the figure, an adjusting screw 3 is installed in the adjusting screw hole 2 of the tool body 1. An adsorption magnet 4 is fixed at the lower end of the adjusting screw 3. The adsorption magnet 4 is a neodymium iron boron high-strength magnet. The diameter of the adsorption magnet 4 is slightly smaller than the diameter of the adjusting screw hole 2. The lower end of the adsorption magnet 4 can attract the test sample 8. Since the diameters of both the adsorption magnet 4 and the test sample 8 are slightly smaller than the diameter of the adjusting screw hole 2, when the adjusting screw 3 moves up and down, it can drive the adsorption magnet 4 and the test sample 8 to move in the adjusting screw hole 2. There is a cross groove 7 for rotating the adjusting screw 3 on the upper end face of the adjusting screw 3.

[0021] As shown in the figure, a wear-resistant plate 5 is connected to the lower end in the length direction of the tool body 1. The wear-resistant plate 5 is made of brass and is rectangular. The shape of the wear-resistant plate 5 matches the lower end face of the tool body 1 in the length direction. There is a round hole in the center of the wear-resistant plate 5. The round hole is opposite to the adjusting screw hole 2 of the tool body 1, and the diameter of the round hole is the same as that of the adjusting screw hole 2 of the tool body 1. There are fixing holes on both sides of the round hole of the wear-resistant plate 5, and corresponding fixing screw holes are on the lower end face of the tool body 1. The fixing screw 6 fixedly connects the wear-resistant plate 5 to the lower end face of the tool body 1. The wear-resistant plate 5 serves to prevent the lower end of the tool body 1 from being worn, and it can be directly replaced when the wear-resistant plate 5 is worn to a certain extent.

[0022] As shown in the figure, the sum of the thickness of the adsorption magnet 4 and the length of the adjusting screw 3 is equal to the sum of the length of the tool body 1 and the thickness of the anti-wear plate 5. Such a design facilitates the observation and control of the amount of wear debris and the remaining thickness of the test sample 8: when there is no test sample 8 placed in front of the adsorption magnet 4, the bottom surface of the adsorption magnet 4 is flush with the bottom surface of the anti-wear plate 5, and at the same time, the upper end surface of the adjusting screw 3 is flush with the upper end surface of the tool body 1; after placing the test sample 8, when the bottom surface of the test sample 8 is flush with the bottom surface of the anti-wear plate 5, the length by which the upper end of the adjusting screw 3 protrudes above the upper end surface of the tool body 1 is the same as the thickness of the test sample 8; turning the adjusting screw 3 downward, the lower end of the test sample 8 extends out of the lower end of the anti-wear plate 5 for wear debris, and when the lower end of the test sample 8 is flush with the lower end of the anti-wear plate 5, the length by which the upper end of the adjusting screw 3 protrudes above the upper end surface of the tool body 1 is the remaining thickness of the test sample 8. The amount of wear debris and the remaining thickness of the test sample 8 can be adjusted and controlled by such a method.

[0023] The usage method of the present utility model is as follows:

[0024] First, turn the adjusting screw 3 counterclockwise slightly, place the test sample 8 to be ground into the circular hole of the anti-wear plate 5 at the lower end of the tool body 1, and press it to ensure that the test sample 8 is adsorbed by the neodymium iron boron adsorption magnet 4. Then turn the adjusting screw 3 so that the test sample 8 exposes about 1 mm below the bottom of the anti-wear plate 5, and grinding can begin.

[0025] If you want to control the remaining thickness of the test sample 8, it can be determined by observing the length by which the upper end of the adjusting screw 3 protrudes above the upper end surface of the tool body 1. After grinding and polishing are completed, turn the adjusting screw 3 clockwise so that the test sample 8 is completely exposed outside the anti-wear plate 5 and then it can be taken off. After testing, the test sample 8 has good usage effects within the range of a diameter of 3 - 4.2 mm and a thickness of not less than 2 mm.

[0026] An embodiment of the present utility model is as follows:

[0027] The tool body 1 is made of 316 stainless steel, with a height of 35 mm, a width of 20 mm, and a thickness of 12 mm;

[0028] The diameter of the adjusting screw hole 2 is 4.2 mm;

[0029] The diameter of the adjusting screw 3 is 4.2 mm, and the length is 34 mm;

[0030] The adsorption magnet 4 is a neodymium iron boron high-strength magnet, with a diameter of 4 mm and a thickness of 4 mm;

[0031] The anti-wear plate 5 is a brass sheet, with a height of 3 mm, a width of 20 mm, a thickness of 12 mm, and the diameter of the circular hole is 4.2 mm;

[0032] The diameter of the test sample 8 is 4 mm and the thickness is 5 mm.

Claims

1. A clamping tool for grinding high-temperature metallographic test samples, characterized in that: It includes a tool body (1), an adjusting screw rod (3), and an adsorption magnet (4). The tool body (1) is a steel rectangular parallelepiped. The length direction of the tool body (1) is perpendicular to the grinding workbench. There is an adjusting screw hole (2) penetrating through the tool body (1) between the two end faces in the length direction of the tool body (1). The central axis of the adjusting screw hole (2) coincides with the central axis in the length direction of the tool body (1). The diameter of the adjusting screw hole (2) matches the diameter of the high-temperature metallographic test sample (8). The thread of the adjusting screw rod (3) matches the adjusting screw hole (2) of the tool body (1). The adjusting screw rod (3) is screwed into the adjusting screw hole (2) of the tool body (1). The lower end of the adjusting screw rod (3) is fixedly connected with the adsorption magnet (4). The diameter of the adsorption magnet (4) matches the diameter of the adjusting screw rod (3). There is a cross-shaped groove (7) for rotating the adjusting screw rod (3) on the upper end face of the adjusting screw rod (3).

2. The clamping tool for grinding high-temperature metallographic test samples according to claim 1, characterized in that: The lower end in the length direction of the tool body (1) is connected with an anti-wear plate (5). The anti-wear plate (5) is rectangular. The shape of the anti-wear plate (5) matches the lower end face in the length direction of the tool body (1). There is a circular hole in the center of the anti-wear plate (5). The circular hole is opposite to the adjusting screw hole (2) of the tool body (1). The diameter of the circular hole is the same as that of the adjusting screw hole (2) of the tool body (1). There are fixing holes on both sides of the circular hole of the anti-wear plate (5). There are corresponding fixing screw holes on the lower end face of the tool body (1). The fixing screw (6) fixedly connects the anti-wear plate (5) with the lower end face of the tool body (1).

3. The clamping tool for grinding high-temperature metallographic test samples according to claim 2, characterized in that: The sum of the thickness of the adsorption magnet (4) and the length of the adjusting screw rod (3) is equal to the sum of the length of the tool body (1) and the thickness of the anti-wear plate (5).

Images