Grinding and polishing clamp for plate-shaped tensile sample

Abstract

The invention discloses a grinding and polishing clamp for a plate-shaped tensile sample, and relates to the technical field of material processing engineering, the grinding and polishing clamp comprises a mounting disc, a liquid storage box and a clamping part; the mounting disc serves as a basic supporting part, a rotating shaft connector externally connected with a rotating driving device is arranged in the center of the mounting disc, the liquid storage box is arranged above the mounting disc, and the clamping part is arranged on the surface, away from the liquid storage box, of the mounting disc; the liquid storage box is used for storing and outputting polishing liquid or water, and the clamping part is used for clamping and positioning a plate-shaped tensile sample; according to the grinding and polishing clamp for the plate-shaped tensile sample, through the clamping block, the adjusting gasket and the anti-loosening structure, a thin plate sample is stably fixed, deviation and warping are avoided, meanwhile, the clamp can adapt to samples with different thicknesses and widths, the machining process is standardized, manual operation is replaced by automatic grinding, and the design of laminar flow liquid supply and flow adjustment of the guide plate is matched; the surface flatness and the roughness uniformity are ensured, the scale distance section machining area is accurately locked, and the characterization requirements of SEM and EBSD are met.

Description

Technical Field

[0001] This invention relates to the field of materials processing engineering technology, and specifically to a grinding and polishing fixture for plate-shaped tensile specimens. Background Technology

[0002] With China's high-speed rail operating mileage exceeding 50,000 kilometers and the CR450 high-speed train reaching speeds of over 450 kilometers per hour, the demand for mechanical performance testing of key components such as shafts and gears is becoming increasingly urgent. Tensile mechanical testing is a core means of verifying the material properties of components. Among them, plate tensile specimens are widely used in the study of material mechanical properties. In particular, in in-situ tensile tests, by loading the specimens and combining them with microscopic observation techniques, it is possible to deeply analyze the microscopic deformation mechanism, crack initiation behavior, and grain orientation change law of the material.

[0003] To meet the imaging requirements of subsequent microscopic analyses such as SEM and EBSD, plate-shaped tensile specimens need to undergo surface grinding and polishing before in-situ observation. This process ensures that the processed area achieves a mirror-like state with high flatness and low roughness. For example, in SEM observation, a smooth surface ensures clear information on morphological changes. In EBSD analysis, surface roughness directly affects the quality of diffraction patterns, which in turn determines the reliability of crystal orientation analysis.

[0004] However, existing methods for preparing the surface of plate tensile specimens still mainly rely on manual mechanical polishing or electrochemical polishing, which have the following technical drawbacks in practical applications:

[0005] Thin plate specimens have poor clamping stability. In-situ tensile specimens are usually thin and have low strength. They are difficult to fix effectively during manual grinding or electrochemical polishing. They are prone to displacement, warping or secondary deformation. Especially when grinding with graded sandpaper, they cannot maintain a straight posture, which affects the surface processing quality.

[0006] Insufficient surface quality consistency, the grinding angle and force direction are uncontrollable during manual operation, and thin plate samples are extremely sensitive to force and angle, which can easily lead to uneven surface flatness and roughness, thus affecting the accuracy of subsequent mechanical tests and the reliability of microscopic characterization data.

[0007] The edges of the specimen are easily damaged. Manual polishing can easily cause the edges of the specimen to break, curl or thin. Electrochemical polishing may cause over-corrosion or even local perforation at the edges due to inaccurate specimen positioning, which seriously affects the loading effect and reliability of the in-situ tensile test.

[0008] The processing area is difficult to define precisely. In-situ tensile specimens require special processing of the gauge length to ensure the quality of microscopic analysis data. However, manual polishing cannot achieve stable and repeatable local processing of the gauge length, and electrochemical polishing lacks a dedicated limiting structure. Both of these factors lead to inaccurate processing areas and inconsistent depths, affecting the reproducibility of experimental results.

[0009] Electrochemical polishing does not meet the requirements of green manufacturing. It requires the use of corrosive or volatile electrolytes, which generate chemical waste liquids that pollute the environment. In addition, it has high energy consumption and insufficient operational safety, making it difficult to meet the green manufacturing requirements of environmental protection, energy saving and clean production.

[0010] In summary, there is an urgent need for a grinding and polishing fixture that can adapt to the characteristics of thin plates, precisely control the processing area, ensure surface quality, and meet the requirements of green manufacturing. Summary of the Invention

[0011] The purpose of this invention is to provide a grinding and polishing fixture for plate-shaped tensile specimens, in order to solve the problems of unstable clamping, uneven surface quality, easy edge damage, difficulty in defining the processing area, and environmentally unfriendly electrochemical polishing in the preparation of thin plate-shaped in-situ tensile specimens in the prior art.

[0012] To achieve the above objectives, the present invention provides the following technical solution: a grinding and polishing fixture for plate-shaped tensile specimens, comprising a mounting plate, a liquid storage box, and a clamping part;

[0013] The mounting plate serves as a basic support component, and a rotating shaft interface for an external rotating drive device is provided at the center of the mounting plate. The liquid storage box is located above the mounting plate, and the clamping part is located on the surface of the mounting plate away from the liquid storage box.

[0014] The liquid storage box is used to store the output polishing liquid or water, and the clamping part is used to clamp and position the plate-shaped tensile specimen.

[0015] Furthermore, the mounting plate is provided with a positioning pin, and the liquid storage box is provided with a positioning hole that matches the positioning pin;

[0016] The mounting plate is provided with a through groove for mounting the clamping part.

[0017] Furthermore, the liquid storage box is provided with a liquid filling port, and the end face of the liquid storage box near the mounting plate is provided with a liquid drain hole, which is connected to a conduit extending to the sample processing area.

[0018] Furthermore, a vent plug is provided on the liquid storage box, and a vent hole adapted to the vent plug is provided through the liquid storage box.

[0019] Furthermore, a guide plate is vertically installed inside the liquid storage box, and a flow regulating screw is provided on the mounting plate;

[0020] The axis of the flow regulating screw points to the conduit, and the flow regulating screw adjusts the flow rate by squeezing the conduit and changing the conduit's cross-sectional area.

[0021] Furthermore, the clamping part includes a first clamping block, a second clamping block, and a fastening adjustment screw arranged opposite to each other;

[0022] The fastening adjustment screw is located at the center of the first clamping block and the second clamping block. The fastening adjustment screw is rotatably connected to the first clamping block and axially fixed. The fastening adjustment screw is threadedly connected to the second clamping block.

[0023] Furthermore, the contact surfaces of the first clamping block and the second clamping block with the sample are provided with adjusting shims, the thickness of which is 0.1~0.5mm.

[0024] Furthermore, the clamping part also includes a guide block and a first slider;

[0025] The guide block is provided with mounting holes and sliding grooves. The guide block is fixed to the first clamping block through the mounting holes. The first slider is slidably disposed in the sliding groove and fixed to the second clamping block.

[0026] Furthermore, both the first clamping block and the second clamping block are connected to a second slider, which is disposed in a through groove on the mounting plate.

[0027] Furthermore, the vent plug is interference-fitted with the vent hole, the number of vent holes is set to at least 2, and the diameter of the vent holes is in the range of 0.3~0.8mm.

[0028] Compared with the prior art, the present invention provides a grinding and polishing fixture for plate tensile specimens, which achieves stable fixation of thin plate specimens by means of clamping blocks, adjusting shims and anti-loosening structures, avoiding displacement and warping, and can be adapted to specimens of different thicknesses and widths, and the processing flow is standardized.

[0029] Automated grinding replaces manual operation, and the design of laminar flow liquid supply and flow regulation with guide plate ensures uniform surface flatness and roughness, accurately locks the processing area of ​​the gauge section, and meets the characterization requirements of SEM and EBSD. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0031] Figure 1 A schematic diagram of the overall structure of the grinding and polishing fixture provided in this embodiment of the invention. Figure 1 ;

[0032] Figure 2A schematic diagram of the overall structure of the grinding and polishing fixture provided in this embodiment of the invention. Figure 2 ;

[0033] Figure 3 This is a schematic diagram of the structure of the liquid storage box hidden in the grinding and polishing fixture provided in an embodiment of the present invention;

[0034] Figure 4 This is a top view of the grinding and polishing fixture provided in an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100. Mounting plate; 101. Liquid reservoir; 101a. Liquid inlet; 101b. Positioning pin; 101c. Vent plug; 101d. Flow regulating screw; 101-1. Guide plate; 101-2. Guide tube; 200. Clamping part; 201. First clamping block; 202. Second clamping block; 203. Adjusting shim; 204. Guide block; 204a. Mounting hole; 204b. Slide groove; 204c. First slider; 205. Fastening adjusting screw; 206. Second slider; 206a. Through groove. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] As attached Figure 1 To be continued Figure 4 As shown:

[0039] Example 1:

[0040] The present invention provides a grinding and polishing fixture for plate-shaped tensile specimens, including a mounting plate 100, a liquid storage box 101 and a clamping part 200 disposed on the mounting plate 100;

[0041] Regarding the mounting plate 100, as the basic support component of the fixture, the mounting plate 100 is provided with a rotating shaft interface at its center, which can be connected to an external rotating drive device to realize the overall rotation of the fixture;

[0042] Regarding the reservoir 101, which is used to store and dispense polishing fluid, it is located above the mounting plate 100.

[0043] The liquid inlet 101a is located on the top of the liquid storage box 101 and is used to inject polishing liquid or clean water;

[0044] Specifically, the liquid filling port 101a is provided with a threaded cover to achieve the sealing of the liquid storage box 101;

[0045] Positioning pin 101b is fixedly set on mounting plate 100 and is used for precise positioning of liquid storage box 101 and mounting plate 100 during assembly process;

[0046] Specifically, the liquid storage box 101 is provided with positioning holes that are adapted to the positioning pins 101b. The number of positioning pins 101b and positioning holes is set to at least 2. In this embodiment, the number of positioning pins 101b and positioning holes is set to 4 and they are evenly distributed in a circular array.

[0047] A vent plug 101c is disposed on the upper end face of the liquid storage box 101, and the liquid storage box 101 is provided with a vent hole corresponding to the vent plug 101c.

[0048] In one feasible implementation, there are 8 vent holes, and the number of vent plugs 101c corresponds to the number of vent holes. The diameter of the vent holes is 0.5mm. The vent plugs 101c and the vent holes are assembled with an interference fit. The vent plugs 101c are made of soft rubber material to improve the sealing performance.

[0049] During use, the operator can adjust the air pressure inside the liquid storage box 101 by adjusting the number of vent holes closed by the vent plug 101c, thereby controlling the flow rate of the polishing liquid.

[0050] A drain hole is provided on the end face of the liquid storage box 101 near the mounting plate 100;

[0051] The conduit 101-2 is connected at one end to the drain hole at the lower end of the liquid storage box 101, and at the other end extends to the sample processing area. It is fixed in the liquid guide groove below the mounting plate 100 by the conduit fixing seat.

[0052] Specifically, the mounting plate 100 is provided with a through hole for accommodating the conduit 101-2;

[0053] The guide plate 101-1 is vertically installed inside the liquid storage box 101 and has a free-form surface structure. The curvature of the surface transitions from the center of the liquid storage box 101 and the inner wall of the liquid storage box 101 to the drain hole. The curvature is gentle near the center and the inner wall, and the curvature increases near the drain hole. This can guide the polishing liquid to form a laminar flow along the tangential contour, avoid the generation of eddies, and improve the return flow efficiency.

[0054] The flow regulating screw 101d is parallel to the end face of the mounting plate 100 and is threaded into the mounting plate 100.

[0055] Specifically, the axis of the flow regulating screw 101d points to the conduit 101-2 located inside the mounting plate 100, the flow regulating screw 101d is threadedly assembled with the mounting plate 100, and a handwheel is provided at the end of the flow regulating screw 101d away from the axis of the mounting plate 100;

[0056] When in use, the operator rotates the handwheel to turn the flow regulating screw 101d. The end of the flow regulating screw 101d near the conduit 101-2 squeezes the conduit 101-2, thereby changing the cross-sectional area of ​​the conduit 101-2 and achieving precise control of the polishing fluid flow rate.

[0057] The clamping part 200, used for clamping and positioning the sample, is disposed on the upper surface of the mounting plate 100 and located outside the liquid storage box 101. The clamping part 200 includes...

[0058] The first clamping block 201 and the second clamping block 202 are arranged opposite to each other and are used as the main body for holding the sample. When in use, the sample is clamped by the relative movement of the first clamping block 201 and the second clamping block 202.

[0059] Adjusting shims 203 are provided on the contact sidewalls of the first clamping block 201 and the second clamping block 202 with the sample, or on the bottom of the first clamping block 201 and the second clamping block 202;

[0060] In one feasible implementation, the thickness of the adjusting shim 203 is in the range of 0.1~0.5mm. By changing the adjusting shim 203 of different thicknesses, the operator can adjust the fixture to fit samples of 1~5mm.

[0061] The guide block 204 serves to prevent side slipping, fasten, and guide. The guide block 204 is provided with mounting holes 204a and sliding grooves 204b.

[0062] The first slider 204c is used as an anti-slip component and is slidably disposed in the groove 204b on the guide block 204.

[0063] The guide block 204 and the first clamping block 201 are fixed by bolts passing through the mounting hole 204a;

[0064] The first slider 204c and the second clamping block 202 are fixed by bolts passing through the first slider 204c and the slide groove 204b;

[0065] It can achieve axial anti-loosening and limiting of the sample, and prevent the sample from shifting axially during processing;

[0066] The fastening adjusting screw 205 is used to drive the first clamping block 201 and the second clamping block 202 to move relative to each other.

[0067] The fastening adjustment screw 205 is located at the center of the first clamping block 201 and the second clamping block 202, and passes through the first clamping block 201 and the second clamping block 202;

[0068] The fastening adjusting screw 205 and the first clamping block 201 are connected by a rotatable connection and are axially fixed, that is, they can rotate but do not slip.

[0069] The fastening adjusting screw 205 and the second clamping block 202 are connected by a threaded connection. That is, when the fastening adjusting screw 205 rotates, the second clamping block 202 is attached to one side of the mounting plate 100 to restrict the rotation. Based on the principle of screw and nut drive and screw drive, the second clamping block 202 is moved back and forth on the outer wall of the fastening adjusting screw 205.

[0070] The second slider 206 is disposed on the end face of the mounting plate 100 away from the first clamping block 201 and the second clamping block 202;

[0071] Each of the first clamping blocks 201 and each of the second clamping blocks 202 is connected to a second slider 206 via a screw.

[0072] The end face of the mounting plate 100 away from the first clamping block 201 and the second clamping block 202 is provided with a through groove 206a;

[0073] Specifically, the through slot 206a is set to correspond to the second slider 206;

[0074] In use, the through slot 206a is used to install the clamping part 200;

[0075] In this embodiment, the through groove 206a is configured as a countersunk groove, and its countersunk boss is used to accommodate the second slider 206 and provide a sliding path for the second slider 206.

[0076] Normal usage status:

[0077] S1. Fixture assembly: Fix the mounting plate 100 to the polishing machine's rotary drive shaft through the central rotating shaft interface to ensure that the installation is firm and the coaxiality meets the process requirements.

[0078] The guide block 204 is fixed to the upper surface of the mounting plate 100 through the mounting hole 204a. The first clamping block 201 and the second clamping block 202 are installed in conjunction with the slide groove 204b of the guide block 204. The adjusting shim 203 is installed. The fastening adjusting screw 205 is fixed by passing through the washer and the corresponding mounting hole 204a, rotatably connected to the first clamping block 201 and axially fixed, and threadedly connected to the second clamping block 202. Then, the first slider 204c and the second slider 206 are installed, so that the first slider 204c is engaged with the slide groove 204b of the guide block 204, and the second slider 206 is in contact with the mounting plate 100.

[0079] The liquid storage box 101 is fixed above the mounting plate 100 by the positioning pin 101b. The guide plate 101-1 is installed inside the liquid storage box 101. One end of the conduit 101-2 is connected to the drain hole of the liquid storage box 101, and the other end is fixed in the liquid guide groove by the conduit fixing seat. Ensure that the outlet of the conduit 101-2 is aligned with the sample processing area. The flow adjustment screw 101d is threaded into the mounting plate 100 so that the end of the conduit 101-2 is close to the conduit 101-2. Finally, the vent plug 101c is installed, and the vent is partially closed in the initial state.

[0080] S2. Sample clamping: Place the in-situ tensile sample of the thin plate to be processed between the first clamping block 201 and the second clamping block 202, align the gauge length with the processing area, rotate the fastening adjustment screw 205 to drive the first clamping block 201 and the second clamping block 202 to move relative to each other along the slide groove 204b until the sample is clamped, ensuring that the sample posture is straight; then lock the first slider 204c and the second slider 206 to achieve axial anti-loosening and overall positioning of the clamping part 200, and avoid sample displacement during processing;

[0081] S3, Grinding and polishing.

[0082] S3a. Rough polishing: Open the liquid inlet 101a of the liquid storage box 101, add clean water to 90% of the volume of the liquid storage box 101, tighten the box cover, adjust the vent plug 101c, open an appropriate amount of vent hole, rotate the flow rate adjustment screw 101d, adjust the liquid flow rate of the guide tube 101-2 to a moderate level, start the polishing machine, set the speed to 250r / min, and simultaneously turn on the liquid supply system. Use 600 grit, 1200 grit, 2500 grit and 4000 grit sandpaper for polishing in sequence. The polishing time for each sandpaper is 2 minutes. During this period, maintain a stable supply of polishing liquid and clean up the polishing debris in time.

[0083] S3b. Fine polishing: Turn off the polishing machine, replace the polishing medium with a velvet polishing cloth, open the lid of the liquid storage box 101, drain the water, and inject 0.05μm silica suspension polishing liquid to 90% of the box volume. After tightening the lid, adjust the vent plug 101c to open all vent holes to balance the air pressure. Rotate the flow regulating screw 101d to adjust the flow area of ​​the guide tube 101-2 so that the polishing liquid flow rate is suitable for the fine polishing conditions. Start the polishing machine and maintain the speed at 250r / min. Continue polishing until the sample surface reaches a mirror finish, meeting the requirements of SEM and EBSD characterization.

[0084] S3c, double-sided processing: After polishing one side, turn off the polishing machine and liquid supply system, disassemble the fixture, rinse the sample and related parts of the fixture with anhydrous ethanol, blow dry in one direction with a blower, stick the processed surface with electrostatic tape, re-clamp the sample in the clamping part 200, repeat the above rough grinding and fine polishing steps to complete the processing of the other side.

[0085] S4. Adaptation and adjustment: If processing samples with a thickness of 1~5mm and a width of 5~36mm, the thickness of the adjustment shim 203 can be replaced with a thickness of 0.1~0.5mm to adapt the thickness. Adjust the distance between the first clamping block 201 and the second clamping block 202 to adapt the width by rotating and tightening the adjusting screw 205. After polishing, turn off the rotating spindle of the polishing machine, tighten the vent plug 101c to prevent the polishing liquid from crystallizing, disassemble the sample and clean it. Thoroughly clean the mounting plate 100, clamping part 200, liquid storage box 101 and liquid supply components with anhydrous ethanol. Dry them with a blower and store them to avoid residual polishing liquid corroding the parts.

[0086] Compared with the prior art, the present invention has the following characteristics:

[0087] The relative clamping action of the first clamping block 201 and the second clamping block 202, combined with the auxiliary support of the adjusting shim 203 and the axial anti-loosening design of the first slider 204c, achieves stable fixation of the thin plate sample, effectively avoiding sample displacement, warping and secondary deformation during processing, and ensuring the sample posture is straight.

[0088] The installation plate 100 is connected to an external rotary drive device to realize automated grinding, replacing manual operation and eliminating the uncontrollability of grinding angle and force direction. At the same time, the guide plate 101-1 guides the laminar flow supply of polishing liquid and the quantitative liquid supply design of the flow regulating screw 101d ensures that the surface flatness and roughness of the sample are uniform and consistent, meeting the stringent requirements of microscopic characterization such as SEM and EBSD.

[0089] The stable clamping method avoids edge damage and curling caused by manual operation, while mechanical polishing replaces electrochemical polishing, eliminating problems such as edge over-corrosion and perforation, ensuring the integrity of the sample and the reliability of the tensile test.

[0090] The positioning structure of the clamping part 200 can accurately lock the gauge length of the sample as the processing area, ensuring that the processing position and depth are consistent, and improving the repeatability of the experimental results.

[0091] It abandons the corrosive electrolyte of electrochemical polishing and adopts mechanical polishing, which generates no chemical waste, consumes less energy, is safe to operate, and meets the requirements of environmental protection, energy saving and clean production.

[0092] By adjusting the fit between the shim 203 and the fastening screw 205, it can accommodate plate-shaped samples of different thicknesses and widths. The processing procedure is standardized, eliminating the need to rely on the operator's experience and lowering the operating threshold.

[0093] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A grinding and polishing fixture for plate-shaped tensile specimens, characterized in that, It includes an installation plate (100), a liquid reservoir (101), and a clamping part (200). The mounting plate (100) serves as a basic support component. A rotating shaft interface for an external rotating drive device is provided at the center of the mounting plate (100). The liquid storage box (101) is located above the mounting plate (100). The clamping part (200) is located on the surface of the mounting plate (100) away from the liquid storage box (101). The liquid storage box (101) is used to store the output polishing liquid or water, and the clamping part (200) is used to clamp and position the plate-shaped tensile specimen.

2. The grinding and polishing fixture for plate-shaped tensile specimens according to claim 1, characterized in that, The mounting plate (100) is provided with a positioning pin (101b), and the liquid storage box (101) is provided with a positioning hole that matches the positioning pin (101b). The mounting plate (100) is provided with a through groove (206a) for mounting the clamping part (200).

3. A grinding and polishing fixture for plate-shaped tensile specimens according to claim 1, characterized in that, The liquid storage box (101) is provided with a liquid filling port (101a), and the end face of the liquid storage box (101) near the mounting plate (100) is provided with a drain hole, and the drain hole is connected to a conduit (101-2) extending to the sample processing area.

4. A grinding and polishing fixture for plate-shaped tensile specimens according to claim 3, characterized in that, The liquid storage box (101) is provided with a vent plug (101c), and a vent hole adapted to the vent plug (101c) is provided through the liquid storage box (101).

5. A grinding and polishing fixture for plate-shaped tensile specimens according to claim 4, characterized in that, The liquid storage box (101) is vertically installed with a guide plate (101-1), and the mounting plate (100) is provided with a flow regulating screw (101d). The axis of the flow regulating screw (101d) points to the conduit (101-2), and the flow regulating screw (101d) regulates the flow rate by squeezing the conduit (101-2) and changing the cross-sectional area of ​​the conduit (101-2).

6. A grinding and polishing fixture for plate-shaped tensile specimens according to claim 1, characterized in that, The clamping part (200) includes a first clamping block (201), a second clamping block (202), and a fastening adjustment screw (205) arranged opposite to each other. The fastening adjustment screw (205) is located at the center of the first clamping block (201) and the second clamping block (202). The fastening adjustment screw (205) is rotatably connected to the first clamping block (201) and axially fixed. The fastening adjustment screw (205) is threadedly connected to the second clamping block (202).

7. A grinding and polishing fixture for plate-shaped tensile specimens according to claim 6, characterized in that, The first clamping block (201) and the second clamping block (202) are provided with adjusting shims (203) on their contact surfaces with the sample. The thickness of the adjusting shims (203) is 0.1~0.5mm.

8. A grinding and polishing fixture for plate-shaped tensile specimens according to claim 6, characterized in that, The clamping part (200) also includes a guide block (204) and a first slider (204c); The guide block (204) is provided with a mounting hole (204a) and a sliding groove (204b). The guide block (204) is fixed to the first clamping block (201) through the mounting hole (204a). The first slider (204c) is slidably disposed in the sliding groove (204b) and fixed to the second clamping block (202).

9. A grinding and polishing fixture for plate-shaped tensile specimens according to claim 6, characterized in that, Both the first clamping block (201) and the second clamping block (202) are connected to a second slider (206), which is disposed in a through groove (206a) on the mounting plate (100).

10. A grinding and polishing fixture for plate-shaped tensile specimens according to claim 4, characterized in that, The vent plug (101c) is interference-fitted with the vent hole, and the number of vent holes is set to at least 2, with the diameter of the vent holes ranging from 0.3 to 0.8 mm.

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