Clamp for micro-pattern stretching

Abstract

The utility model relates to a clamp for micro pattern stretching, including the clamping seat, two clamping seats are upside down, the opposite side of two clamping seats sets the step, the bolt is installed on the step of clamping seat through the through -hole of clamping block surface opening, the four dog bone -like pattern notches of the opposite side of two clamping seats are set in the center of clamping block, and the plug is set between the two clamping blocks of clamping seat, the utility model discloses clamping pattern through clamping block and clamping seat, guaranteeing sample to be in vertical state through plug, effectively alleviating weight while ensuring structural strength, reducing the interference of stretching process, and guaranteeing the accuracy of experimental data. The middle part of the clamping block is provided with a dog bone-like pattern notch, which can flexibly adjust the distance between the two clamping blocks according to the size of the sample, so that the clamp can adapt to various different sizes of stretching samples and has good compatibility.

Description

Technical Field

[0001] This utility model relates to an experimental fixture, specifically a fixture for stretching small specimens. Background Technology

[0002] With the rapid development of microelectromechanical systems, biomedicine, and new materials, the demand for precise tensile testing of micro-samples and in-situ tensile testing for microscopic observation is increasing. Currently, the macroscopic fixtures commonly found in standard material testing machines are suitable for large-size samples, but they have significant limitations when holding micro-samples of 5-10 mm. There is a severe dimensional mismatch between the fixture and the specimen. The jaws of macroscopic fixtures are usually much larger than the clamping ends of microscopic specimens, resulting in insufficient clamping surface to fully cover the specimen, insufficient contact area, and a high risk of localized stress concentration. Large preloads are often required during clamping, which can easily lead to crushing, scratching, or premature fracture of the specimen near the clamping ends, hindering effective force transfer and affecting the accuracy and reliability of the test data.

[0003] Currently, some researchers are trying to fix tiny samples by means of adhesives, but this method is prone to problems such as adhesive layer contamination, curing stress, and inconsistent strength, which not only destroy the original properties of the sample, but also significantly reduce the repeatability of the test and the credibility of the results.

[0004] Currently, a utility model patent with publication number CN211740862U discloses a clamp for a miniature tensile specimen, including a tensile specimen. Both ends of the tensile specimen are clamped with clamping assemblies. The clamping assemblies include an outer clamping workpiece, an inner clamping workpiece, and a limiting workpiece. The outer clamping workpiece is a square block structure. A clamping opening is formed in the middle of the upper half of the outer clamping workpiece, and external insertion holes are uniformly formed in the upper half. Slots are formed on both the front and rear side walls of the lower half of the outer clamping workpiece. The inner clamping workpiece is also a square block structure, located within the clamping cavity of the clamping opening. Slots are formed on both the front and rear side walls of the bottom of the inner clamping workpiece, and a limiting groove is provided above the middle of the slot. A rod is welded to the inner side wall of the top of the limiting workpiece. These features help the clamps firmly hold the miniature tensile specimen, preventing slippage during the tensile test and ensuring the accuracy and feasibility of the tensile test.

[0005] As can be seen from the above-disclosed technical content, as prior art, the utility model with announcement number CN211740862U can clamp and fix the end of a micro tensile specimen by cooperating with an inner clamping workpiece and an outer clamping workpiece. The inner clamping workpiece and the outer clamping workpiece are limited and assembled by a limiting workpiece. However, the size of the limiting groove of this patent is fixed, making it difficult to adapt to various models and not very convenient to use. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a fixture for tensile testing of micro-samples. It can be used in conjunction with existing macro-fixtures and is a dedicated micro-fixture that enables non-destructive, precise, and rapid clamping of micro-samples.

[0007] To achieve the above objectives, this utility model provides a clamp for micro-pattern stretching, comprising a clamp base, two clamp bases positioned vertically opposite each other, a step provided on one side of the two clamp bases, bolts installed on the step of the clamp base through through holes opened on the surface of the clamp blocks, dog bone-shaped pattern notches provided at the center of the four clamp blocks on the opposite side of the two clamp bases, and a blocking block provided between the two clamp blocks of the clamp base; threaded posts are provided on the surface of the two clamp bases respectively, and the two threaded posts are on the same axis.

[0008] In addition, the fixture for micro-pattern stretching proposed according to the above embodiments of this utility model may also have the following additional technical features: As a further improvement of this utility model, the block is equipped with a block handle.

[0009] As a further improvement of this utility model, a waist-shaped hole is opened laterally on the surface of the clamping block.

[0010] As a further improvement of this utility model, the clamp, clamp block and block are all made of aluminum alloy.

[0011] As a further improvement of this utility model, the bolt is an internal hex bolt.

[0012] By employing the above-described scheme, this utility model possesses at least the following advantages: The specimen is held in a clamping configuration using clamping blocks and clamping seats, and the specimen is kept vertical by a blocking block. This effectively reduces weight while ensuring structural strength, minimizing interference with the tensile process and ensuring the accuracy of experimental data. A dog-bone-shaped notch is provided in the center of the clamping blocks, allowing for flexible adjustment of the distance between the two clamping blocks according to the specimen size. This enables the fixture to adapt to various sizes of small tensile specimens, demonstrating good compatibility. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a fixture used for stretching small patterns; Figure 2 This is a schematic diagram showing the state of the fixture used for micro-sample tensile testing on the fixture of a universal tensile testing machine. In the diagram: 1. Clamp, 2. Clamping block, 3. Block, 4. Block handle, 5. Bolt, 6. Threaded post. Detailed Implementation

[0014] The fixture for micro-pattern stretching according to this invention is described below with reference to the accompanying drawings.

[0015] In Embodiment 1 of this application, as Figure 1 and Figure 2 As shown, the fixture for micro-pattern stretching (hereinafter referred to as "the present invention") includes a clamp 1, two clamps 1 are positioned vertically opposite each other, a step is provided on the opposite side of the two clamps 1, bolts 5 are installed on the step of the clamp 1 through through holes opened on the surface of the clamp blocks 2, dog bone-shaped pattern notches are provided at the center of the four clamp blocks 2 on the opposite side of the two clamps 1, and a block 3 is provided between the two clamp blocks 2 of the clamp 1; threaded posts 6 are respectively provided on the surface of the two clamps 1, and the two threaded posts 6 are on the same axis.

[0016] A fixture for miniature tensile specimens, with utility model publication number CN211740862U (hereinafter referred to as "the patent"), can clamp and fix the ends of miniature tensile specimens through the cooperation of inner and outer clamping workpieces. Limiting workpieces are used to limit the assembly of the inner and outer clamping workpieces. However, the size of the limiting groove in the patent is fixed, making it difficult to adapt to various specimen sizes and inconvenient to use. The present invention, however, uses clamping blocks 2 and clamping seats 1 to clamp the specimen, effectively reducing weight while ensuring structural strength, minimizing interference with the tensile process, and ensuring the accuracy of experimental data. The clamping blocks have a dog-bone-shaped notch in the middle, allowing for flexible adjustment of the distance between the two clamping blocks according to the specimen size, enabling the fixture to adapt to tensile specimens of various sizes and providing good compatibility.

[0017] To further optimize the working efficiency of this application and make the operation of the plug block 3 more convenient, the plug block 3 is equipped with a plug block handle 4. To accommodate more types of designs, a transverse oblong hole is formed on the surface of the clamping block 2. To reduce the weight of the fixture while ensuring strength, the clamping base 1, clamping block 2, and plug block 3 are all made of aluminum alloy. The bolt 5 is a hexagon socket head cap screw. The oblong hole and the hexagon socket head cap screw allow for flexible fixing and position adjustment of the clamping block on the clamping base, further improving clamping accuracy. The aluminum alloy material is anodized to enhance wear resistance and corrosion resistance, extending the service life of the fixture. The plug block handle is detachable for easy carrying and replacement, adapting to different operating environments. The overall structure is compact and easy to assemble, effectively improving the efficiency of tensile test preparation.

[0018] When this utility model is used, its specific operation is as follows: During the tensile test, clamp 2 is pressed tightly against the inner surface of the step of clamp 1. Bolt 5 is used to engage with the threaded hole on the step of clamp 1 to clamp clamp 2. The dog-bone-shaped specimen notch of clamp 2 is used to clamp the specimen. The specimen has large protrusions at both ends, which can be embedded into the corresponding positions of the dog-bone-shaped specimen notch to achieve reliable fixation of the specimen. An M8×1.25 threaded post 6 is installed on the top of the clamp so that the fixture of the universal tensile testing machine can hold the threaded post and apply tensile load to the specimen through this fixture.

[0019] During assembly, it is recommended to first assemble the two clamps 1 (arranged vertically) and threaded post 6 onto the large clamp of the universal tensile testing machine, then install the clamping block 2, and finally place the specimen between the clamping blocks 2 and tighten the bolt 5. This assembly sequence helps ensure specimen alignment and reduces the influence of external interference forces. After installation, the plug block 3 can be used to lightly press the specimen to make it fit tightly against the clamping surface, thereby ensuring that the specimen is in a vertical position.

[0020] In summary, the clamp for micro-sample tensile testing according to this embodiment of the invention holds the sample using clamping blocks 2 and clamping seats 1, and ensures the sample is in a vertical position using blocking blocks 3. This effectively reduces weight while ensuring structural strength, minimizing interference with the tensile process and ensuring the accuracy of experimental data. The clamping blocks have a dog-bone-shaped notch in the middle, allowing for flexible adjustment of the distance between the two clamping blocks according to the sample size, enabling the clamp to adapt to tensile samples of various sizes and providing good compatibility.

[0021] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A clamp for stretching small patterns, comprising a clamp base (1), characterized in that, Two clamps (1) are positioned opposite each other, and a step is provided on the opposite side of the two clamps (1). Bolts (5) are installed on the step of the clamps (1) through the through holes opened on the surface of the clamps (2). Dog bone-shaped notches are provided at the center of the four clamps (2) on the opposite side of the two clamps (1). A block (3) is provided between the two clamps (2) of the clamps (1). Threaded columns (6) are provided on the surface of the two clamps (1) respectively, and the two threaded columns (6) are on the same axis.

2. The fixture for micro-pattern stretching according to claim 1, characterized in that, The block (3) is equipped with a block handle (4).

3. The fixture for micro-pattern stretching according to claim 2, characterized in that, The clamping block (2) has a waist-shaped hole opened laterally on its surface.

4. The fixture for micro-pattern stretching according to claim 1, characterized in that, The clamp (1), clamp (2) and block (3) are all made of aluminum alloy.

5. The fixture for micro-pattern stretching according to claim 4, characterized in that, The bolt (5) is an internal hex bolt.

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