Sample preparation device and sample preparation method for vertical section sample of carbon fiber tow

Abstract

The invention discloses a sample preparation device and a sample preparation method for a vertical section sample of a carbon fiber tow. The sample preparation device comprises a sample table and a cutter, a cross-shaped opening groove is formed in the center of the top surface of the sample table, a supporting rod is arranged in the center of the bottom surface of the sample table, the cross-shaped opening groove has a first direction and a second direction which are perpendicular to each other, and a carbon fiber tow to be cut is fixed in the cross-shaped opening groove in the first direction; the cutter comprises a cutting handle, a cutting blade and a base, a groove for placing the sample table is formed in the top surface of the base, a hole groove matched with the supporting rod is formed in the center of the groove bottom of the groove, and a cutting groove is formed in the top surface of the base and located on the outer side of an opening of the cross-shaped opening groove in the first direction; the cutting handle is connected with the cutting blade, and the cutting handle is pressed downwards to drive the cutting blade to vertically cut into the cutting groove so as to vertically cut off the carbon fiber tow to be cut. The method can be used for accurately preparing the vertical section sample of the fiber tow, reducing the sample preparation difficulty and improving the result reproducibility.

Description

Technical Field

[0001] The invention relates to the technical field of carbon fiber, aramid fiber and glass fiber detection, and in particular to a sample preparation device and a sample preparation method for a vertical cross-section sample of a carbon fiber tow. Background Art

[0002] As a high-performance carbon material, carbon fiber boasts excellent properties such as high strength and low density, making it an ideal reinforcement for advanced composite materials. It is widely used in a wide range of fields, including aerospace, automotive, new energy, infrastructure, and leisure and sports. Accurately characterizing the fiber's cross-sectional structure is crucial for fiber research and quality testing. This typically requires obtaining a complete fiber cross-section perpendicular to the fiber's axis for in-depth analysis using scanning electron microscopy, microscopy, or other analytical techniques.

[0003] However, carbon fiber is very thin and brittle, presenting numerous challenges when cross-sectioning it. For one thing, the fiber is easily deformed during the cutting process, resulting in the cross section not accurately reflecting the fiber's true structure. Furthermore, burrs generated by cutting can interfere with observation, making it difficult to obtain a cross section perpendicular to the fiber axis, thus severely impacting the accuracy and reliability of the observation results.

[0004] At present, the sample preparation methods for fiber cross-section samples at home and abroad mainly include traditional quenching, embedding and polishing. However, in actual operation, these traditional methods have many disadvantages:

[0005] 1. Complicated steps: It requires multiple complex operation links and requires high skills of the operator.

[0006] 2. Poor operability: Each step requires precise control, which makes the operation difficult and prone to errors.

[0007] 3. Time-consuming: The entire sample preparation process takes a lot of time, seriously affecting work efficiency.

[0008] 4. Large sample preparation errors: Due to the large number of complex operating steps, it is difficult to ensure the consistency of sample preparation each time, resulting in large sample preparation errors.

[0009] 5. Poor applicability to fiber bundles of different specifications: Fiber bundles of different specifications require different parameters and operating methods to be adjusted during processing. Traditional methods are difficult to meet this requirement and are usually unable to correctly obtain fiber cross-section samples perpendicular to the fiber axis, which in turn affects the measurement results, resulting in poor reproducibility of characterization results and unable to meet the actual needs of scientific research and production. Summary of the Invention

[0010] In response to the problems existing in the prior art such as complicated operation, large errors, poor reproducibility of results, and poor applicability to fiber bundles of different specifications, the present invention aims to provide a simple, universal, efficient, and low-cost sampling device and method for preparing vertical cross-section samples of fiber bundles; through this device and method, vertical cross-section samples of fiber bundles can be accurately prepared, the difficulty of sample preparation can be reduced, the reproducibility of results can be improved, and the needs of scientific research and production for the preparation of fiber cross-section samples can be met.

[0011] The invention discloses a sample preparation device for a vertical cross-section sample of a carbon fiber tow, comprising: a sample stage and a cutter;

[0012] A cross-shaped opening groove is provided at the center of the top surface of the sample stage, and a support rod is provided at the center of the bottom surface of the sample stage. The cross-shaped opening groove has a first direction and a second direction perpendicular to each other, and the carbon fiber tow to be cut is fixed in the first direction in the cross-shaped opening groove;

[0013] The cutter includes a cutting handle, a cutting blade and a base. The top surface of the base is provided with a groove for placing the sample table, and a hole groove adapted to the support rod is provided at the center of the bottom of the groove. The top surface of the base is provided with a cutting groove outside the opening of the cross-opening groove in the first direction, and the carbon fiber tow to be cut is horizontally above the cutting groove; the cutting handle is connected to the cutting blade, and pressing the cutting handle downward drives the cutting blade to vertically cut into the cutting groove to vertically cut the carbon fiber tow to be cut.

[0014] As a further improvement of the present invention, the cross-opening groove has a first long cross groove, a second long cross groove, a third short cross groove and a fourth short cross groove, the first long cross groove and the second long cross groove are arranged along the first direction, the third short cross groove and the fourth short cross groove are arranged along the second direction, and the first direction and the second direction are arranged perpendicularly.

[0015] As a further improvement of the present invention, the carbon fiber tow to be cut is pasted into the first long cross groove and the second long cross groove along the first direction through the first conductive glue at the bottom, and the top of the carbon fiber tow to be cut is fixed to the carbon fiber tow to be cut and the sample table through the second conductive glue; wherein, the second conductive glue is pasted into the third short cross groove and the fourth short cross groove along the second direction.

[0016] As a further improvement of the present invention, the sample stage is a square stage, and the groove is a square groove that is compatible with the length, width and height of the sample stage.

[0017] As a further improvement of the present invention, the support rod is a cylindrical rod, and the hole groove is a circular hole groove that is compatible with the diameter and height of the support rod.

[0018] As a further improvement of the present invention, the cutting groove is aligned with the opening of the first cross-long groove, and the cutting blade is aligned with the opening of the first cross-long groove.

[0019] As a further improvement of the present invention, the cutter further includes a sample pressing block connected to the cutting handle, and the sample pressing block corresponds to the center of the cross opening groove.

[0020] The cam is fixed on the base and is provided with a protrusion, and the two ends of the mounting frame are slidably mounted on the support rods on both sides of the mounting frame, and the bottom end of the support rod is fixed on the base, and a spring is sleeved on the support rod, and the lower end of the spring is against the base, and the upper end of the spring is against the bottom surface of the mounting frame; the cutting blade and the sample pressing block are installed under the mounting frame, and the lower end of the sample pressing block is lower than the lower end of the cutting blade; when the cutting handle is pressed downward, the protrusion presses the mounting frame to move vertically downward and the spring is compressed. In the process of pressing the cutting handle downward, the sample pressing block first contacts and compresses the fiber tow, and continues to press the cutting handle downward, and the cutting blade cuts the fiber tow along the cutting groove; after completing the cutting of the fiber tow, the cutting handle is released, and under the action of the spring reset, the cutting handle and the mounting frame are reset.

[0021] As a further improvement of the present invention, the sample table is an aluminum substrate, the base of the cutter is a solid cast iron substrate, the cutting handle is a solid stainless steel handle, the cutting blade is a high-hardness steel blade, and the sample pressing block is an anti-static polypropylene block.

[0022] The present invention also discloses a method for preparing a vertical cross-section sample of a carbon fiber tow, comprising:

[0023] Pasting the first conductive adhesive along the first direction into the first cross-long groove and the second cross-long groove of the sample stage;

[0024] Straighten the carbon fiber tow to be cut and make the fiber length direction parallel to the first direction of the sample stage and stick it on the first conductive adhesive;

[0025] Pasting the second conductive glue into the third cross short groove and the fourth cross short groove of the sample stage along the second direction of the sample stage to fix the carbon fiber tow to be cut and the sample stage;

[0026] Align the outer opening of the first cross-shaped groove of the sample stage with the cutting groove, and insert the support rod of the sample stage into the hole groove of the cutter base, so that the sample stage is embedded in the groove of the cutter base;

[0027] Press the cutting handle of the cutter downward, and the cutting blade cuts the fiber tow along the cutting groove to obtain a vertical cross-section sample of the fiber.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. Easy to operate: The sample preparation device and method of the present invention are cleverly designed, with simple and clear operating steps, which do not require complex skills and experience and reduce the requirements for operators.

[0030] 2. Accurate and efficient: The sample preparation device and method of the present invention can quickly and accurately obtain vertical cross-section samples of fiber tows, greatly improving the efficiency and accuracy of sample preparation.

[0031] 3. Strong versatility: The sample preparation device and method of the present invention can adapt to fiber bundles of different specifications and have wide applicability.

[0032] 4. Improve the reproducibility of results: The sample preparation device and method of the present invention reduce the interference of human factors, so that the results of each sample preparation have high consistency, and significantly improve the reproducibility of the results. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of a sample preparation device for a vertical cross-section sample of a carbon fiber tow disclosed in the present invention;

[0034] Figure 2 for Figure 1 Schematic diagram of the structure of the middle sample stage;

[0035] Figure 3 for Figure 1 Schematic diagram of the structure of the middle cutter;

[0036] Figure 4 for Figure 3 Schematic diagram of the specific installation structure of the cutting blade and the sample pressing block.

[0037] In the picture:

[0038] 1. Sample stage; 11. Cross-shaped opening groove; 111. First long cross groove; 112. Second long cross groove; 113. Third short cross groove; 114. Fourth short cross groove; 12. Support rod; 2. Cutter; 21. Cutting handle; 22. Cutting blade; 23. Sample pressing block; 24. Base; 25. Square groove; 26. Round hole groove; 27. Cutting groove; 28. Cutting base; 29. Protrusion; 210. Mounting bracket; 211. Support rod; 212. Spring. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0040] The present invention is described in further detail below with reference to the accompanying drawings:

[0041] like Figures 1 to 3 As shown, the present invention provides a sample preparation device for a vertical cross-section sample of a carbon fiber tow, comprising: a sample stage 1 and a cutter 2; wherein, a cross-opening groove 11 is provided at the center of the top surface of the sample stage 1, and a support rod 12 is provided at the center of the bottom surface of the sample stage 1, wherein the cross-opening groove 11 has a first direction and a second direction perpendicular to each other, and the carbon fiber tow to be cut is fixed in the first direction of the cross-opening groove 11; the cutter 2 includes a cutting handle 21, a cutting blade 22, a sample pressing block 23 and a base 24, wherein the top surface of the base 24 is provided with a square groove 25 for placing the sample stage 1 A circular hole 26 that is compatible with the support rod 12 is provided at the center of the bottom of the square groove 25, and a cutting groove 27 is provided on the top surface of the base 24 on the outside of the opening of the cross-opening groove 11 in the first direction, and the carbon fiber tow to be cut is horizontally above the cutting groove 27; the cutting handle 21 and the pressing block 23 are connected to the cutting blade 22, and the cutting handle 21 is pressed downward to drive the pressing block 23 to press on the carbon fiber tow in the center of the cross-opening groove 11, and drive the cutting blade 22 to cut vertically into the cutting groove 27 to vertically cut the carbon fiber tow to be cut.

[0042] Specifically:

[0043] The sample stage 1 of the present invention is made of an aluminum substrate with a length, width, and thickness of 19 mm × 13 mm × 3 mm. A cross-shaped opening 11 is formed in the center of the substrate. The length, width, and depth of the cross-shaped opening 11 are 19 mm × 13 mm × 1.5 mm, and the opening width is 9 mm. A support rod 12 is formed at the bottom of the substrate. The support rod 12 has a diameter of 3 mm and a height of 6 mm. The cross-shaped opening 11 comprises a first long cross-shaped opening 111, a second long cross-shaped opening 112, a third short cross-shaped opening 113, and a fourth short cross-shaped opening 114. The first long cross-shaped opening 111 and the second long cross-shaped opening 112 are arranged along a first direction, and the third short cross-shaped opening 113 and the fourth short cross-shaped opening 114 are arranged along a second direction. The first direction and the second direction are perpendicular to each other. When in use, the carbon fiber bundle to be cut is pasted into the first cross long groove 111 and the second cross long groove 112 along the first direction through the first conductive glue at the bottom, and the top of the carbon fiber bundle to be cut is fixed to the carbon fiber bundle to be cut and the sample table through the second conductive glue; wherein, the second conductive glue is pasted into the third cross short groove 113 and the fourth cross short groove 114 along the second direction.

[0044] The main body of the cutter 2 of the present invention is made of a solid cast iron base plate; the length, width and height of the cutter are 26cm×16cm×28cm. The cutting handle 21 is made of solid stainless steel, the cutting blade 22 is made of high-hardness steel, the sample pressing block 23 is made of anti-static polypropylene, and the base 24 is made of a solid cast iron base plate. The base is provided with a square groove 25, a circular hole groove 26 and a cutting groove 27; the length, width and depth of the square groove are 19mm×13mm×3mm, and a circular hole groove is provided in the middle of the square groove, and is aligned with the center of the sample pressing block. The diameter of the circular hole groove is 3mm and the depth is 6mm. The cutting groove is aligned with one end of the square groove, and the length, width and depth of the cutting groove are 30mm×2mm×4mm. Further, as Figure 4As shown, one end of the cutting handle 21 is connected to the cutting base 28, and the cutting base 28 is fixed to the base 24; a protrusion 29 is fixed on the cutting handle 21, and the protrusion 29 presses on the top of the mounting frame 210. The two ends of the mounting frame 210 are slidably mounted on the support rods 211 on both sides, and the bottom ends of the support rods 211 are fixed to the base 24. A spring 212 is sleeved on the support rod 211, and the lower end of the spring 212 rests on the base 24, and the upper end of the spring 212 rests on the bottom surface of the mounting frame 210; a cutting blade 22 and The sample pressing block 23 has its lower end lower than the lower end of the cutting blade 22; the cutting handle 21 is pressed downward, the protrusion 29 presses the mounting frame 210 to move vertically downward and the spring 212 is compressed. In the process of pressing the cutting handle 21 downward, the sample pressing block 23 first contacts and compresses the fiber bundle, and the cutting handle 21 is continued to be pressed downward, and the cutting blade 22 cuts the fiber bundle along the cutting groove 27; after completing the cutting of the fiber bundle, the cutting handle 21 is released, and under the action of the spring 212 resetting, the cutting handle 21 and the mounting frame 210 are reset.

[0045] The present invention provides a method for preparing a vertical cross-section sample of a carbon fiber tow, comprising:

[0046] S1. Take a conductive adhesive with a length of about 15 mm to 20 mm (the recommended optimal size is about 17 mm) and stick it in the cross-shaped groove of the sample stage along the first direction;

[0047] S2. Take a fiber bundle about 6 cm to 9 cm long (the recommended optimal size is about 8 cm), straighten the fiber bundle and make the fiber length direction parallel to the first direction of the sample stage and stick it on the conductive glue;

[0048] S3. Take a conductive adhesive with a length ranging from about 9 mm to 13 mm (the recommended optimal size is about 11 mm) and stick it on the fiber bundle and the sample stage along the second direction;

[0049] S4. Align the opening of the first cross-shaped groove of the sample stage with the cutting groove, and insert the sample stage support rod into the circular hole groove of the cutter base so that the sample stage is embedded in the square groove of the cutter base;

[0050] S5. Manually press the cutting handle of the cutter downward. The sample pressing block of the cutter first contacts and compresses the fiber bundle. Continue to press the cutting handle of the cutter downward. The cutting blade cuts the fiber bundle along the cutting groove to obtain a vertical cross-section sample of the fiber.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sample preparation device for a vertical cross-section sample of a carbon fiber tow, characterized in that: include: Sample stage and cutter; A cross-shaped opening groove is provided at the center of the top surface of the sample stage, and a support rod is provided at the center of the bottom surface of the sample stage. The cross-shaped opening groove has a first direction and a second direction perpendicular to each other, and the carbon fiber tow to be cut is fixed in the first direction in the cross-shaped opening groove; The cutter includes a cutting handle, a cutting blade and a base. The top surface of the base is provided with a groove for placing the sample table, and a hole groove adapted to the support rod is provided at the center of the bottom of the groove. The top surface of the base is provided with a cutting groove outside the opening of the cross-opening groove in the first direction, and the carbon fiber tow to be cut is horizontally above the cutting groove; the cutting handle is connected to the cutting blade, and pressing the cutting handle downward drives the cutting blade to vertically cut into the cutting groove to vertically cut the carbon fiber tow to be cut.

2. The sample preparation device according to claim 1, characterized in that: The cross opening groove has a first cross long groove, a second cross long groove, a third cross short groove and a fourth cross short groove. The first cross long groove and the second cross long groove are arranged along the first direction, and the third cross short groove and the fourth cross short groove are arranged along the second direction. The first direction and the second direction are arranged perpendicularly.

3. The sample preparation device according to claim 2, characterized in that: The carbon fiber tow to be cut is pasted into the first cross long groove and the second cross long groove along the first direction through the first conductive glue at the bottom, and the top of the carbon fiber tow to be cut is fixed to the carbon fiber tow to be cut and the sample table through the second conductive glue; wherein, the second conductive glue is pasted into the third cross short groove and the fourth cross short groove along the second direction.

4. The sample preparation device according to claim 1, wherein: The sample stage is a square stage, and the groove is a square groove adapted to the sample stage.

5. The sample preparation device according to claim 1, wherein: The support rod is a cylindrical rod, and the hole groove is a circular hole groove adapted to the support rod.

6. The sample preparation device according to claim 1, wherein: The cutting groove is aligned with the opening of the first cross-long groove, and the cutting blade is aligned with the opening of the first cross-long groove.

7. The sample preparation device according to claim 1, wherein: The cutter further comprises a sample pressing stopper connected to the cutting handle, and the sample pressing stopper corresponds to the center of the cross opening groove.

8. The sample preparation device according to claim 7, characterized in that: The cam is fixed on the base and is secured on the base with a spring which is secured on the base to the bottom of the base, the cam being secured on the base to the bottom of the base.

9. The sample preparation device according to claim 7, characterized in that: The sample stage is an aluminum substrate, the base of the cutter is a solid cast iron substrate, the cutting handle is a solid stainless steel handle, the cutting blade is a high-hardness steel blade, and the sample pressing block is an anti-static polypropylene block.

10. A method for preparing a vertical cross-section sample of a carbon fiber tow based on the sample preparation device according to any one of claims 1 to 9, characterized in that: include: Pasting the first conductive adhesive along the first direction into the first cross-long groove and the second cross-long groove of the sample stage; Straighten the carbon fiber tow to be cut and make the fiber length direction parallel to the first direction of the sample stage and stick it on the first conductive adhesive; Pasting the second conductive glue into the third cross short groove and the fourth cross short groove of the sample stage along the second direction of the sample stage to fix the carbon fiber tow to be cut and the sample stage; Align the outer opening of the first cross-shaped groove of the sample stage with the cutting groove, and insert the support rod of the sample stage into the hole groove of the cutter base, so that the sample stage is embedded in the groove of the cutter base; Press the cutting handle of the cutter downward, and the cutting blade cuts the fiber tow along the cutting groove to obtain a vertical cross-section sample of the fiber.

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