A device for polishing notches along the thickness direction of a flat specimen and a method for using the device

Abstract

The invention discloses a device for polishing a notch along a thickness direction of a flat specimen and a method for using the device, wherein the device comprises a base, a specimen fixing mechanism, a friction rod, a friction rod limiting mechanism and a driving mechanism, the specimen is fixed on the specimen fixing mechanism, the friction rod is adjusted and fixed relative to the specimen by the friction rod limiting mechanism, and finally the driving mechanism is started to polish the notch of the specimen; the device has a simple structure and is easy to operate, and adopts an electric motor to drive the friction rod, so as to realize fast and efficient polishing of the notch surface along the thickness direction of the specimen, and can obtain a high-quality notch surface that meets the metallographic observation level, so as to study the influence of the material microstructure on the behavior of small cracks in the experiment.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical polishing of metal specimen surfaces, and particularly relates to a device for polishing notches along a thickness direction of a flat specimen and a use method thereof. Background Art

[0002] Fatigue fracture is one of the main failure forms of mechanical mechanisms during service. A large number of research results show that most of the fatigue life of metal components is consumed in the initiation and expansion stages of small cracks. Small cracks have significantly different expansion characteristics from long cracks, that is, below the threshold stress intensity factor of long cracks, small cracks can still expand; under the same stress intensity factor range, the expansion rate of small cracks is much higher than that of long cracks. Therefore, if long crack expansion data is directly used in the design of components containing small cracks, it will lead to an overestimation of fatigue life. In order to obtain a more accurate fatigue life prediction method, it is necessary to reveal the small crack initiation and expansion mechanism of the material through small crack expansion tests.

[0003] Small crack growth tests are more complex and time-consuming than long crack tests. Currently, in-situ scanning electron microscopy and surface replication methods are mostly used to observe small crack behavior. The in-situ scanning electron microscopy method has high resolution, but due to its small observation range, it is difficult to capture the early initiation and expansion behavior of small cracks. Therefore, the surface replication method is still the most widely used small crack observation method. This method is also the recommended method of the fatigue small crack growth rate test standard ASTMSTP1149, ASTME647-95a and HB7705-2001 of metal materials. The surface replication method mostly uses a flat specimen with a single-sided notch, and has high requirements on the specimen surface, especially the notch surface state. In recent years, many scholars have carried out metallographic corrosion on the notch of the specimen in their research to obtain the metallographic structure of the notch surface and study the influence of the material microstructure on the behavior of small cracks. This requires that the notch surface not only removes defects such as processing scratches, but also further achieves a bright mirror effect that meets the metallographic observation level.

[0004] General grinding and polishing machines cannot meet the requirements of polishing the notch. Manual grinding and polishing is mostly used in existing research. Usually, sandpaper is first wrapped around a round rod with a diameter slightly smaller than the notch diameter, and then the notch is polished. This method is both time-consuming and labor-intensive, and it is difficult to ensure the consistency of the notch surface of parallel specimens. During metallographic polishing, generally, sandpaper with a larger mesh number is used to polish the material surface in a certain direction, and then sandpaper with a smaller mesh number is used to polish in a direction perpendicular to the previous grinding and polishing direction. When the coarser wear marks left by the previous grinding and polishing completely disappear, and the new finer wear marks are consistent with the current grinding and polishing direction, sandpaper with a smaller mesh number is used to polish in a direction perpendicular to the wear marks, and so on and so forth until the notch surface reaches a mirror effect. The Chinese patent CN205703664U "Sample Notch Polishing Machine" discloses a device for polishing the notch, but the device can only polish along the length direction of the flat specimen, and cannot polish the notch along the thickness direction of the specimen, and still cannot meet the requirements of metallographic corrosion on the material surface. Summary of the invention

[0005] The first purpose of the present invention is to provide a device that can polish the notch along the thickness direction of a flat specimen. The device can make up for the deficiency in the prior art that the notch can only be polished along the length direction of the specimen. The device has a simple structure and is easy to operate. It can quickly and efficiently polish the notch surface along the thickness direction of the specimen to obtain a high-quality surface that meets the metallographic observation level, so as to study the influence of the material microstructure on the behavior of small cracks in the experiment.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A device for polishing a notch along the thickness direction of a flat specimen comprises a base, a specimen fixing mechanism, a friction rod, a friction rod limiting mechanism and a driving mechanism.

[0008] The specimen fixing mechanism comprises a first specimen fixing platform and a second specimen fixing platform symmetrically mounted on the base to fix the specimen, wherein a first movable clamping piece is detachably mounted on the first specimen fixing platform to clamp one end of the specimen, and a second movable clamping piece is detachably mounted on the second specimen fixing platform to clamp the other end of the specimen;

[0009] The friction rod comprises a round rod and sandpaper wrapped on the outer wall of the round rod;

[0010] The friction rod limiting mechanism comprises a second support frame, a first support frame, and a pressing block which are sequentially mounted on the base, the first support frame and the second support frame are located on both sides of the axial direction of the test piece, and a sleeve with a compression spring embedded inside is arranged on the side of the pressing block facing the test piece; the friction rod is fixed on the first support frame and the second support frame, and the part of the round rod wrapped with sandpaper falls into the notch on the top surface of the test piece;

[0011] The driving mechanism comprises a motor mounted on a base and an eccentric wheel connected to a rotating shaft of the motor;

[0012] The end of one end of the round rod contacts the eccentric wheel, and the end of the other end of the round rod is inserted into the sleeve to resist the compression spring; the friction rod and the test piece are perpendicular to each other.

[0013] As a preferred solution of the above technology, the friction rod limiting mechanism also includes a threaded rod, a threaded rod support frame and a handwheel, one end of the threaded rod passes through the threaded holes on the threaded rod support frame and the clamping block in sequence, and the other end of the threaded rod is connected to the handwheel; a guide rail is provided at the bottom of the clamping block, and the guide rail is installed on the base between the first support frame and the threaded rod support frame.

[0014] As a preferred solution of the above technology, two strip through holes are provided on the outer side of the first specimen fixing table, and two first clamping bolts pass through the two strip through holes to install the first movable clamping plate on the specimen fixing table; two strip through holes are provided on the outer side of the second specimen fixing table, and two second clamping bolts pass through the two strip through holes to install the second movable clamping plate on the second specimen fixing table b; one end of the specimen is clamped between the back plate of the first specimen fixing table and the first movable clamping plate, and the other end of the specimen is clamped between the back plate of the second specimen fixing table and the second movable clamping plate.

[0015] As a preferred solution of the above technology, the semi-cylindrical grooves respectively arranged on the top surfaces of the first support frame and the second support frame and the notch on the top surface of the specimen are located on the same straight line.

[0016] As a preferred solution of the above technology, a first clamping plate is provided on the top of the first support frame, and the round rod falls into the semi-cylindrical groove on the top surface of the first support frame, and the first clamping plate presses the round rod, and the two axial ends of the round rod are respectively fixed to the first clamping plate and the first support frame by a first locking bolt; a second clamping plate is provided on the top of the second support frame, and the round rod falls into the semi-cylindrical groove on the top surface of the second support frame, and the second clamping plate presses the round rod, and the two axial ends of the round rod are respectively fixed to the second clamping plate and the second support frame by a second locking bolt.

[0017] As a preferred solution of the above technology, the diameter of the cylindrical cavity formed by the first pressing sheet and the first supporting frame is slightly larger than the diameter of the round rod;

[0018] As a preferred solution of the above technology, the diameter of the cylindrical cavity formed by the second pressing plate and the second supporting frame is slightly larger than the diameter of the round rod.

[0019] As a preferred solution of the above technology, the sandpaper is wrapped around the round rod for two times along the circumference direction and glued to the round rod; the diameter of the round rod wrapped with sandpaper is smaller than the diameter of the notch on the top surface of the specimen.

[0020] As a preferred solution of the above technology, the sleeve is a cylinder, the natural length of the compression spring is smaller than the length of the sleeve, the outer diameter of the compression spring is slightly smaller than the inner diameter of the sleeve, and the inner diameter of the compression spring is larger than the diameter of the round rod; the side thickness of the eccentric wheel is slightly larger than the diameter of the round rod.

[0021] The second object of the present invention is to provide a method for using the above-mentioned device for polishing the notch along the thickness direction of the flat specimen, which method can simply and conveniently polish the notch surface of the specimen along the thickness direction of the specimen.

[0022] To achieve the above object, the technical solution adopted by the present invention is:

[0023] A method for using a device for polishing a notch along a thickness direction of a flat specimen comprises the following steps:

[0024] Step 1, take the specimen to be ground and polished, with the notch facing upward, and place the two ends of the specimen on the first specimen fixing table and the second specimen fixing table respectively, with the surface of the specimen close to the inner wall and back plate of the first specimen fixing table and the second specimen fixing table;

[0025] Step 2, after the first movable clamping piece and the second movable clamping piece are pressed against the surface of the specimen, the first clamping bolt and the second clamping bolt are tightened to fix the specimen on the first specimen fixing table and the second specimen fixing table;

[0026] Step 3: Wrap the sandpaper around the middle of the round rod for two weeks along its circumference and fix it with glue to obtain a friction rod;

[0027] Step 4: Place the friction rod on the first support frame and the second support frame so that the part with the sandpaper falls into the notch of the test piece;

[0028] Step 5: Place the first pressing plate on the first support frame and tighten the first locking bolt; place the second pressing plate on the second support frame and tighten the second locking bolt to prevent the friction rod from jumping up and down;

[0029] Step 6, turn the hand wheel and screw the pressing block into the appropriate position through the threaded rod, that is, when one end of the friction rod contacts the compression spring in the natural state, the other end of the friction rod can contact the side of the eccentric wheel at the point closest to the rotating shaft;

[0030] Step 7: Start the motor to drive the eccentric wheel to rotate, thereby driving the friction rod to polish the notch of the test piece.

[0031] As a preferred solution of the above technology, in step 1, the number of specimens placed on the first specimen fixing table and the second specimen fixing table is one or more.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention uses a specimen fixing table and a movable clamping piece to fix the specimen, which can fix specimens of different thicknesses or fix multiple specimens at the same time, and can realize batch grinding and polishing of the specimens.

[0034] 2. The present invention winds sandpaper on a round rod to grind and polish the test piece, and sandpaper with different mesh sizes can be easily replaced to perform different levels of polishing on the test piece, with low cost.

[0035] 3. The present invention has a simple structure and is easy to operate. It uses an electric motor to drive the friction rod, which avoids the inefficiency of conventional manual polishing of the notch and makes up for the deficiency of the prior art that the notch can only be polished along the length direction of the specimen. It realizes fast and efficient polishing of the notch surface along the thickness direction of the specimen, and can obtain a high-quality notch surface that meets the metallographic observation level, so as to study the influence of the material microstructure on the behavior of small cracks in the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0037] Figure 2 for Figure 1 A top view of

[0038] Figure 3 for Figure 2 A cross-sectional view of the sleeve of part A;

[0039] Figure 4 for Figure 1 Left view of .

[0040] In the figure: 1-base, 2-test piece, 3a-first test piece fixing platform, 3b-second test piece fixing platform, 4a-first movable clamping plate, 4b-second movable clamping plate, 5a-first clamping bolt, 5b-second clamping bolt, 6a-first support frame, 6b-second support frame, 7a-first pressing plate, 7b-second pressing plate, 8a-first locking bolt, 8b-second locking bolt, 9-round rod, 10-sandpaper, 11-pressing block, 12-guide rail, 13-threaded rod, 14-threaded rod support frame, 15-handwheel, 16-sleeve, 17-compression spring, 18-motor, 19-eccentric wheel. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with embodiments.

[0042] like Figure 1-4As shown, a device for polishing a notch along the thickness direction of a flat specimen comprises a base, a specimen fixing mechanism, a friction rod, a friction rod limiting mechanism and a driving mechanism, wherein the specimen fixing mechanism comprises a first specimen fixing platform 3a and a second specimen fixing platform 3b symmetrically mounted on the base 1 to fix the specimen 2, wherein a first movable clamping piece 4a is detachably mounted on the first specimen fixing platform 3a to clamp one end of the specimen 2, and a second movable clamping piece 4b is detachably mounted on the second specimen fixing platform 3b to clamp the other end of the specimen 2; the friction rod comprises a round rod 9 and sandpaper 10 wrapped on the outer wall of the round rod 9; the friction rod limiting mechanism comprises a second support frame 6b sequentially mounted on the base 1 , a first support frame 6a, and a clamping block 11, wherein the first support frame 6a and the second support frame 6b are located on both sides of the axial direction of the specimen 2, and a sleeve 16 with a compression spring 17 embedded therein is provided on the side of the clamping block 11 facing the specimen 2; the friction rod is fixed on the first support frame 6a and the second support frame 6b, and the part of the round rod 9 wrapped with sandpaper 10 falls into the notch on the top surface of the specimen 2; the driving mechanism includes a motor 18 mounted on the base 1 and an eccentric wheel 19 connected to the rotating shaft of the motor 18; the end of one end of the round rod 9 contacts the eccentric wheel 19, and the end of the other end of the round rod 9 is inserted into the sleeve 16 to resist the compression spring 17; the friction rod and the specimen 2 are perpendicular to each other.

[0043] The friction rod limiting mechanism also includes a threaded rod 13, a threaded rod support frame 14 and a handwheel 15, one end of the threaded rod 13 passes through the threaded holes on the threaded rod support frame 14 and the clamping block 11 in sequence, and the other end of the threaded rod 13 is connected to the handwheel 15; a guide rail 12 is provided at the bottom of the clamping block 11, and the guide rail 12 is installed on the base 1 between the first support frame 6a and the threaded rod support frame 14.

[0044] Two strip through holes are arranged on the outer side of the first specimen fixing platform 3a, and two first clamping bolts 5a pass through the two strip through holes to install the first movable clamping plate 4a on the specimen fixing platform 3; two strip through holes are arranged on the outer side of the second specimen fixing platform 3b, and two second clamping bolts 5b pass through the two strip through holes to install the second movable clamping plate 4b on the second specimen fixing platform 3b; one end of the specimen 2 is clamped between the back plate of the first specimen fixing platform 3a and the first movable clamping plate 4a, and the other end of the specimen 2 is clamped between the back plate of the second specimen fixing platform 3b and the second movable clamping plate 4b.

[0045] The semi-cylindrical grooves respectively arranged on the top surfaces of the first support frame 6a and the second support frame 6b and the notch on the top surface of the specimen 2 are located on the same straight line; a first clamping plate 7a is arranged on the top of the first support frame 6a, and the round rod 9 falls into the semi-cylindrical groove on the top surface of the first support frame 6a, and the first clamping plate 7a presses the round rod 9, and the two axial ends of the round rod 9 are respectively fixed to the first clamping plate 7a and the first support frame 6a by a first locking bolt 8a; a second clamping plate 7b is arranged on the top of the second support frame 6b, and the round rod 9 falls into the semi-cylindrical groove on the top surface of the second support frame 6b, and the second clamping plate 7b presses the round rod 9, and the two axial ends of the round rod 9 are respectively fixed to the second clamping plate 7b and the second support frame 6b by a second locking bolt 8b.

[0046] The diameter of the cylindrical cavity formed by the first pressing plate 7a and the first supporting frame 6a is slightly larger than the diameter of the round rod 9; the diameter of the cylindrical cavity formed by the second pressing plate 7b and the second supporting frame 6b is slightly larger than the diameter of the round rod 9.

[0047] The sandpaper 10 is wrapped around the round rod 9 for two times along the circumference direction and is glued to the round rod 9; the diameter of the round rod 9 wrapped with the sandpaper 10 is smaller than the diameter of the notch on the top surface of the test piece 2.

[0048] The sleeve 16 is a cylinder, the natural length of the compression spring 17 is smaller than the length of the sleeve 16, the outer diameter of the compression spring 17 is slightly smaller than the inner diameter of the sleeve 16, and the inner diameter of the compression spring 17 is larger than the diameter of the round rod 9; the side thickness of the eccentric wheel 19 is slightly larger than the diameter of the round rod 9.

[0049] A method for using a device for polishing a notch along a thickness direction of a flat specimen comprises the following steps:

[0050] Step 1, take the specimen 2 to be ground and polished, with the notch facing upward, and place the two ends of the specimen 2 on the first specimen fixing platform 3a and the second specimen fixing platform 3b respectively, with the surface of the specimen 2 close to the inner wall and back plate of the first specimen fixing platform 3a and the second specimen fixing platform 3b;

[0051] Step 2: After the first movable clamping piece 4a and the second movable clamping piece 4b are pressed against the surface of the test piece 2, the first clamping bolt 5a and the second clamping bolt 5b are tightened to fix the test piece 2 on the first test piece fixing platform 3a and the second test piece fixing platform 3b;

[0052] Step 3, wrap the sandpaper 10 around the middle of the round rod 9 along its circumference for two weeks, and fix it with glue to obtain a friction rod;

[0053] Step 4, place the friction rod on the first support frame 6a and the second support frame 6b, so that the part with the sandpaper 10 falls into the notch of the test piece 2;

[0054] Step 5, place the first pressing sheet 7a on the first supporting frame 6a, and tighten the first locking bolt 8a; place the second pressing sheet 7b on the second supporting frame 6b, and tighten the second locking bolt 8b, so that the friction rod will not jump up and down;

[0055] Step 6, turn the hand wheel 15, and screw the pressing block 11 into a suitable position through the threaded rod 13, that is, when one end of the friction rod contacts the compression spring 17 in the natural state, the other end of the friction rod can contact the side of the eccentric wheel 19 at the closest point to the rotating shaft;

[0056] Step 7: Start the motor 18 to drive the eccentric wheel 19 to rotate, thereby driving the friction rod to polish the notch of the test piece 2.

[0057] As a preferred solution of the above technology, in the step 1, the number of specimens 2 placed on the first specimen fixing table 3a and the second specimen fixing table 3b is any number, such as one, two or more; specifically, for each additional specimen 2, a set of first movable clamping plates 4a, first clamping bolts 5a, second movable clamping plates 4b and second clamping bolts 5b need to be added, the back of the new specimen 2 is attached to the back of the previous first movable clamping plates 4a and second movable clamping plates 4b, a new set of first movable clamping plates 4a and second movable clamping plates 4b are loaded and pressed against the front of the new specimen 2, and then a new family of first clamping bolts 5a and second clamping bolts 5 are installed.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for polishing a notch along the thickness direction of a flat specimen, comprising a base, a specimen fixing mechanism, a friction rod, a friction rod limiting mechanism and a driving mechanism, characterized in that: The specimen fixing mechanism comprises a first specimen fixing platform (3a) and a second specimen fixing platform (3b) symmetrically mounted on the base (1) for fixing the specimen (2); the first specimen fixing platform (3a) is detachably mounted with a first movable clamping piece (4a) for clamping one end of the specimen (2); the second specimen fixing platform (3b) is detachably mounted with a second movable clamping piece (4b) for clamping the other end of the specimen (2); two strip-shaped through holes are arranged on the outer side of the first specimen fixing platform (3a); two first clamping bolts (5a) pass through the two strip-shaped through holes. The first movable clamping piece (4a) is mounted on the specimen fixing platform (3) through a strip-shaped through hole; the outer side of the second specimen fixing platform (3b) is provided with two strip-shaped through holes, and two second clamping bolts (5b) pass through the two strip-shaped through holes to mount the second movable clamping piece (4b) on the second specimen fixing platform (3b); one end of the specimen (2) is clamped between the back plate of the first specimen fixing platform (3a) and the first movable clamping piece (4a), and the other end of the specimen (2) is clamped between the back plate of the second specimen fixing platform (3b) and the second movable clamping piece (4b); The friction rod comprises a round rod (9) and sandpaper (10) wrapped around the outer wall of the round rod (9); The friction rod limiting mechanism comprises a second support frame (6b), a first support frame (6a), and a pressing block (11) which are sequentially mounted on the base (1); the first support frame (6a) and the second support frame (6b) are located on both sides of the axial direction of the test piece (2); a sleeve (16) having a compression spring (17) embedded therein is provided on a surface of the pressing block (11) facing the test piece (2); the friction rod is fixed on the first support frame (6a) and the second support frame (6b), and the portion of the round rod (9) wrapped with the sandpaper (10) falls into the test piece (2) in the notch on the top surface; the friction rod limiting mechanism also includes a threaded rod (13), a threaded rod support frame (14) and a hand wheel (15), one end of the threaded rod (13) passes through the threaded holes on the threaded rod support frame (14) and the pressing block (11) in sequence, and the other end of the threaded rod (13) is connected to the hand wheel (15); a guide rail (12) is provided at the bottom of the pressing block (11), and the guide rail (12) is installed on the base (1) between the first support frame (6a) and the threaded rod support frame (14); respectively provided on the first support frame ( 6a) and the semi-cylindrical groove on the top surface of the second support frame (6b) and the notch on the top surface of the test piece (2) are located on the same straight line; a first clamping plate (7a) is provided on the top of the first support frame (6a), the round rod (9) falls into the semi-cylindrical groove on the top surface of the first support frame (6a), the first clamping plate (7a) presses the round rod (9), and the first clamping plate (7a) and the first support frame (6a) are fixed to the two axial ends of the round rod (9) by a first locking bolt (8a) respectively; a second clamping plate is provided on the top of the second support frame (6b) (7b), the round rod (9) falls into the semi-cylindrical groove on the top surface of the second support frame (6b), the second clamping plate (7b) presses the round rod (9), and the two axial ends of the round rod (9) are respectively fixed to the second clamping plate (7b) and the second support frame (6b) by a second locking bolt (8b); the diameter of the cylindrical cavity formed by the first clamping plate (7a) and the first support frame (6a) is larger than the diameter of the round rod (9); the diameter of the cylindrical cavity formed by the second clamping plate (7b) and the second support frame (6b) is larger than the diameter of the round rod (9); The driving mechanism comprises a motor (18) mounted on a base (1) and an eccentric wheel (19) connected to a rotating shaft of the motor (18); The end of one end of the round rod (9) contacts the eccentric wheel (19), and the end of the other end of the round rod (9) is inserted into the sleeve (16) to resist the compression spring (17); the friction rod and the test piece (2) are perpendicular to each other.

2. The device for polishing a notch along the thickness direction of a flat specimen according to claim 1, characterized in that: The sandpaper (10) is wrapped around the round rod (9) for two cycles in the circumferential direction and is glued to the round rod (9) by means of glue; the diameter of the round rod (9) wrapped with the sandpaper (10) is smaller than the diameter of the notch on the top surface of the test piece (2).

3. The device for polishing a notch along the thickness direction of a flat specimen according to claim 1, characterized in that: The sleeve (16) is a cylinder, the natural length of the compression spring (17) is smaller than the length of the sleeve (16), the outer diameter of the compression spring (17) is smaller than the inner diameter of the sleeve (16), and the inner diameter of the compression spring (17) is larger than the diameter of the round rod (9); and the side thickness of the eccentric wheel (19) is larger than the diameter of the round rod (9).

4. The method for using the device for polishing the notch along the thickness direction of the flat specimen according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1, take a test piece (2) to be ground and polished, with the notch facing upwards, and place the two ends of the test piece (2) on a first test piece fixing table (3a) and a second test piece fixing table (3b) respectively, with the surface of the test piece (2) closely attached to the inner side walls and back plates of the first test piece fixing table (3a) and the second test piece fixing table (3b); Step 2: After the first movable clamping piece (4a) and the second movable clamping piece (4b) are pressed against the surface of the test piece (2), the first clamping bolt (5a) and the second clamping bolt (5b) are tightened to fix the test piece (2) on the first test piece fixing platform (3a) and the second test piece fixing platform (3b); Step 3, wrapping the sandpaper (10) around the middle of the round rod (9) along its circumferential direction and fixing it with glue to obtain a friction rod; Step 4, placing the friction rod on the first support frame (6a) and the second support frame (6b) so that the portion with the sandpaper (10) attached falls into the notch of the test piece (2); Step 5, place the first pressing plate (7a) on the first supporting frame (6a), and tighten the first locking bolt (8a); place the second pressing plate (7b) on the second supporting frame (6b), and tighten the second locking bolt (8b); Step 6, turn the hand wheel (15) to screw the pressing block (11) into a suitable position through the threaded rod (13), that is, when one end of the friction rod contacts the compression spring (17) in the natural state, the other end of the friction rod can contact the side of the eccentric wheel (19) at the point closest to the rotating shaft; Step 7: Start the motor (18) to drive the eccentric wheel (19) to rotate, thereby driving the friction rod to polish the notch of the test piece (2).

5. The method for using the device for polishing notches along the thickness direction of a flat specimen according to claim 4, characterized in that: In the step 1, the number of the test pieces (2) placed on the first test piece fixing table (3a) and the second test piece fixing table (3b) is one or more.

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