Compression test fixture and testing machine for superhard material

Abstract

The compression test fixture comprises an upper pressure plate and a lower pressure plate which are oppositely arranged, an upper joint is arranged above the upper pressure plate, the upper pressure plate is connected with the testing machine through the upper joint, a lower support is arranged at the bottom of the lower pressure plate, and the lower pressure plate is mounted on the testing machine through a lower support; mounting grooves are formed in the opposite side surfaces of the upper pressure plate and the lower pressure plate, and hard alloy parts are arranged in the mounting grooves and are used for reducing the use loss of the tool in the compression test. According to the scheme, a hard alloy part structure is arranged between the upper pressure plate and the lower pressure plate, so that the use loss of the tool is reduced, and the service life is prolonged; due to the detachable arrangement, after the surface of the hard alloy part is seriously abraded, the hard alloy part can be independently replaced, and the maintenance cost is reduced; by using the grating ruler displacement meter and the feeler lever, the accurate compression deformation can be measured, and the accurate compression mechanical property of the superhard material can be obtained through data calculation; and the protective cover ensures that chippings generated after the sample is damaged cannot be splashed out of the range of the protective cover.

Description

Technical Field

[0001] This utility model relates to the field of material testing equipment, specifically to a compression test fixture and testing machine for superhard materials. Background Technology

[0002] Superhard materials possess extremely high hardness and are widely used in high-tech fields. With technological advancements and industrial development, the market demand for superhard materials is increasing daily. The emergence of more superhard materials also places increasing demands on the tooling required for testing their mechanical properties. Conventional metal compression fixtures cannot be used for compression tests of superhard materials, mainly due to the following reasons:

[0003] First, the surface hardness of materials used in ordinary metal compression tooling is still lower than that of superhard materials after processing and heat treatment. This will cause obvious indentations to appear on the surface of the pressure plate after multiple tests, leading to tooling repair or scrapping and increasing test costs.

[0004] Second, due to the brittle and hard characteristics of superhard materials, their compression deformation is often very small. In order to obtain accurate data on the material's compression performance, high-precision measuring tools are needed to measure the minute deformation in the experiment.

[0005] Third, the compression failure of superhard materials can cause debris to fly out, which poses a risk.

[0006] Fourth, during the experiment, the testers cannot closely observe the changes and damage process of the sample, and the cleaning and sweeping work after the experiment is more troublesome, which increases the time cost of a single experiment.

[0007] Therefore, how to increase the efficiency and accuracy of compression tests on superhard materials, reduce the maintenance costs of tooling, and protect the safety of test personnel and equipment has become an urgent problem to be solved. Utility Model Content

[0008] The purpose of this utility model is to overcome at least one defect of the prior art and provide a compression test fixture and testing machine for superhard materials.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A compression test fixture for superhard materials includes an upper pressure plate and a lower pressure plate arranged opposite to each other. An upper connector is provided above the upper pressure plate, and the upper pressure plate is connected to a testing machine through the upper connector. A lower support is provided at the bottom of the lower pressure plate, and the lower pressure plate is mounted on the testing machine through the lower support. Mounting grooves are provided on the opposite sides of the upper and lower pressure plates, and hard alloy parts are placed in the mounting grooves to reduce the wear and tear of the fixture during compression testing.

[0011] Furthermore, a detachable fixing plate is provided in the mounting groove, and the cemented carbide part is installed in the mounting groove through the fixing plate.

[0012] Furthermore, the upper surface of the cemented carbide part protrudes beyond the surfaces of the upper pressure plate and the lower pressure plate.

[0013] Furthermore, the upper pressure plate is provided with an upper side mounting bracket, and the lower pressure plate is provided with a lower side mounting bracket. The upper side mounting bracket and the lower side mounting bracket are respectively provided through the horizontal direction of the upper pressure plate and the lower pressure plate, and extend to the outer side of the upper pressure plate and the lower pressure plate. The upper side mounting bracket and the lower side mounting bracket are arranged parallel to each other in the same extending direction.

[0014] Furthermore, the upper mounting bracket is provided with upper mounting holes at both ends located outside the upper pressure plate, and a grating ruler displacement meter is installed in the upper mounting holes to monitor the amount of compression deformation of the sample during the compression test.

[0015] Furthermore, the lower mounting bracket has lower mounting holes at both ends located outside the lower pressure plate. The lower mounting holes correspond to the positions of the upper mounting holes. A contact rod is installed on the lower mounting hole. The grating ruler displacement gauge contacts the upper surface of the contact rod during downward movement to obtain the amount of compression deformation of the sample in the compression test.

[0016] Furthermore, both ends of the upper and lower mounting brackets are provided with handles, and the grating ruler displacement gauge and the contact rod are fastened by rotating the handles.

[0017] Furthermore, a protective cover is provided on the outer side of the upper pressure plate, and both ends of the upper mounting bracket extend out of the outer side of the protective cover, so that the grating ruler displacement meter is located outside the protective cover.

[0018] Furthermore, the depth of the protective cover is greater than the height of the upper pressure plate, and the opening of the protective cover can partially cover the upper side of the lower pressure plate, so that the debris after the sample is damaged during the compression test will not splash out of the range of the protective cover.

[0019] This solution also relates to a testing machine having a fixture mounting base, wherein the upper joint and the lower support of the aforementioned compression test fixture for superhard materials are respectively mounted on the fixture mounting base of the testing machine to complete the compression test of the testing machine.

[0020] Based on the above-mentioned compression test fixture and testing machine for superhard materials, the following beneficial effects are achieved:

[0021] ① This design uses a structure with embedded hard alloy parts between the upper and lower pressure plates, which can significantly reduce the wear and tear of the tooling in the compression test of superhard materials due to the high hardness and high wear resistance, thus increasing the service life.

[0022] ② The fasteners of the cemented carbide parts are detachable. When the surface of the cemented carbide parts is severely worn, the cemented carbide parts can be replaced individually, reducing maintenance costs.

[0023] ③ Due to the modular structure of the upper and lower pressure plates, the hard alloy parts can be removed and replaced with ordinary pressure plates to conduct compression tests on conventional metal materials, thus achieving backward compatibility;

[0024] ④ By using the grating ruler displacement gauge and the contact rod, the repeatability is high, and comparative tests of batch samples can be carried out. The grating ruler displacement gauge measures the precise amount of compression deformation during the compression test, and the accurate compressive mechanical properties of the superhard material can be obtained through data calculation.

[0025] ⑤ A protective cover was installed on the upper pressure plate. During the compression of the superhard material sample, the protective cover can cover the entire upper pressure plate and part of the lower pressure plate at the same time, ensuring that the debris after the sample is damaged will not fly out of the range of the protective cover, protecting the test personnel and equipment. At the same time, it makes it easier for the test personnel to observe the changes of the sample during the test and to clean up after the test, thus improving the efficiency of a single test.

[0026] ⑥ This structure is convenient to use, simple in design, and has a wide range of applications. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the compression test fixture for superhard materials in this embodiment;

[0028] Figure 2 yes Figure 1 A schematic diagram of a surface structure;

[0029] Figure 3 yes Figure 1 Another schematic diagram of the surface structure;

[0030] Figure 4 This is a schematic diagram of the mounting section of the cemented carbide component in this embodiment;

[0031] Figures 5-6 These are schematic diagrams of the two cemented carbide parts structures in this embodiment;

[0032] In the picture:

[0033] 1. Compression test fixture structure;

[0034] 10. Upper pressure plate; 100. Upper connector; 101. Upper mounting bracket; 102. Handle; 103. Mounting slot; 104. Fixing plate; 105. Upper mounting hole;

[0035] 11. Lower pressure plate; 110. Lower support; 111. Lower side mounting bracket; 112. Lower mounting hole;

[0036] 12. Protective cover; 120. Locking parts;

[0037] 130. Optical grating ruler displacement gauge; 131. Contact rod;

[0038] 14. Hard alloy parts. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of description and simplification of operation. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] like Figures 1-6 As shown, this embodiment is a compression test fixture 1 for superhard materials, including an upper pressure plate 10 and a lower pressure plate 11 arranged opposite to each other. An upper connector 100 is provided above the upper pressure plate 10, and the upper pressure plate 10 is connected to the testing machine through the upper connector 100. A lower support 110 is provided at the bottom of the lower pressure plate 11, and the lower pressure plate 11 is mounted on the testing machine through the lower support 110. The testing machine can adopt the existing testing machine structure. The testing machine has a fixture mounting base. The upper connector 100 and the lower support 110 are respectively mounted on the fixture mounting base of the testing machine to complete the compression test of the testing machine.

[0044] Combination Figures 5-6 As shown, the upper pressure plate 10 and the lower pressure plate 11 can adopt the same disc-shaped structure. Each of the opposite sides of the upper pressure plate 10 and the lower pressure plate 11 is provided with a mounting groove 103. A hard alloy part 14 is installed in the mounting groove 103 to reduce wear and tear on the tooling during the compression test. A detachable fixing plate 104 is provided in the mounting groove 103. The hard alloy part 14 is installed in the mounting groove 103 through the fixing plate 104, and the upper surface of the hard alloy part 14 protrudes from the surfaces of the upper pressure plate 10 and the lower pressure plate 11.

[0045] This embodiment exemplarily illustrates two mounting structures for the mounting groove 103 and the hard alloy part 14, such as... Figure 5 The diagram shows one type of installation structure. The mounting groove 103 is provided through one side surface of the upper pressure plate 10 and / or the lower pressure plate 11, forming a long strip-shaped groove structure. The fixing plate 104 adopts the same long strip structure and has the same width as the mounting groove 103. It is detachably snapped into the mounting groove 103. The fixing plate 104 and the mounting groove 103 are fixed by screws or other connection methods. The fixing plate 104 is provided with holes, and the hard alloy part 14 is installed at the holes and installed in the mounting groove 103 through the fixing plate 104.

[0046] like Figure 6 The diagram shows another installation structure. The mounting groove 103 is located in the middle of one side surface of the upper pressure plate 10 and / or the lower pressure plate 11. It is a circular groove structure concentrically arranged with the upper pressure plate 10 and / or the lower pressure plate 11. The fixing plate 104 also adopts a disc-shaped structure with the same diameter as the mounting groove 103. It is detachably snapped into the mounting groove 103. The fixing plate 104 and the mounting groove 103 are fixed by screws or other connection methods. The fixing plate 104 is provided with holes, and the hard alloy part 14 is installed at the holes and installed in the mounting groove 103 through the fixing plate 104.

[0047] It should be noted that the two embodiments described above are merely exemplary structural settings. In actual use, other shapes or installation structures can also be used, such as square or triangular grooves. In addition to the screws in the embodiments, the fixing between the fixing plate 104 and the mounting groove 103 can also be achieved by setting a locking structure between the two structures to realize installation and disassembly, all of which fall within the scope of protection of this solution.

[0048] In this embodiment, the cemented carbide part 14 is made of tungsten steel sheet. In other embodiments, the material of the cemented carbide part 14 can also be adjusted according to actual needs.

[0049] An upper mounting bracket 101 is provided on the upper pressure plate 10, and a lower mounting bracket 111 is provided on the lower pressure plate 11. The upper mounting bracket 101 and the lower mounting bracket 111 are respectively arranged through the upper pressure plate 10 and the lower pressure plate 11 in the horizontal direction, and extend to the outside of the upper pressure plate 10 and the lower pressure plate 11. The upper mounting bracket 101 and the lower mounting bracket 111 are arranged parallel to each other in the same extending direction.

[0050] The upper mounting bracket 101 has upper mounting holes 105 at both ends located outside the upper pressure plate 10. A grating ruler displacement meter 130 is installed in the upper mounting holes 105 to monitor the compression deformation of the sample during the compression test. The lower mounting bracket 111 has lower mounting holes 112 at both ends located outside the lower pressure plate 11. The lower mounting holes 112 correspond to the positions of the upper mounting holes 105. A contact rod 131 is installed in the lower mounting holes 112. The grating ruler displacement meter 130 contacts the upper surface of the contact rod 131 as it moves downward to obtain the compression deformation of the sample during the compression test.

[0051] Both ends of the upper mounting bracket 101 and the lower mounting bracket 111 are provided with handles 102, and the grating ruler displacement meter 130 and the contact rod 131 are fastened by rotating the handles 102.

[0052] A protective cover 12 is provided on the outer side of the upper pressure plate 10. The protective cover 12 is transparent or semi-transparent so that the situation inside the protective cover 12 can be observed from the outside during the test. A locking member 120 is provided on the upper part of the protective cover 12, and the protective cover 12 is locked to the upper pressure plate 10 through the locking member 120. The protective cover 12 has two oppositely arranged circular holes on both sides. The upper bracket 101 extends out of the outer side of the protective cover 12 through the two circular holes, so that the grating ruler displacement meter 130 is located outside the protective cover 12. In addition, the depth of the protective cover 12 is greater than the height of the upper pressure plate 10, and the opening of the protective cover 12 can partially cover the upper side of the lower pressure plate 11, so that the debris after the sample is damaged during the compression test will not fly out of the range of the protective cover.

[0053] Based on the above structure, the installation and testing process of this solution is as follows:

[0054] First, the protective cover 12 is fitted into the upper pressure plate 10. After aligning the circular hole on the protective cover 12 with the mounting thread hole of the bracket 101 on the upper side of the upper pressure plate 10, the protective cover 12 is pressed and fixed onto the upper pressure plate 10 using the locking member 120. The locking member 120 here is a locking nut. Other structures can also be used for locking in other embodiments.

[0055] Then, the cemented carbide part 14 (tungsten carbide sheet in this embodiment) is embedded into the mounting groove 103 of the upper pressure plate 10 and fixed by the fixing plate 104 and screws. The tungsten carbide sheet is fixed on the lower pressure plate 11 in the same way.

[0056] Third, apply thread-locking adhesive to the threads of the upper bracket 101 and the lower bracket 111, and screw them into the upper pressure plate 10 and the lower pressure plate 11, ensuring that the planes of the upper bracket 101 and / or the lower bracket 111 are parallel to the planes of the upper pressure plate 10 and / or the lower pressure plate 11, and that the widths of the upper bracket 101 and the lower bracket 111 are as consistent as possible. Let it stand for 24 hours to ensure that the thread-locking adhesive is completely cured.

[0057] Fourth, insert a pair of grating ruler displacement gauges 130 into the holes of the upper bracket 101 on the upper pressure plate 10, and tighten them using the embossing handle 102; insert two contact rods 131 into the holes of the lower bracket 111 on the lower pressure plate 11, and tighten them using the embossing handle 102.

[0058] Fifth, when using the tooling, connect the upper connector 100 of the upper pressure plate 10 assembly to the upper clamp mounting base of the testing machine, insert the pin, and tighten the lock nut; insert the connector of the lower support 110 into the lower clamp mounting base, place the lower pressure plate 11 assembly above the lower support 110 and adjust the lower pressure plate 11 surface to be horizontal, place the sample on the tungsten steel sheet embedded in the lower pressure plate 11, and adjust the position of the contact rod 131 and the grating ruler displacement meter 130 according to the size of the sample to ensure that the effective deformation can be measured during the test;

[0059] Finally, after the test begins, the main beam of the testing machine moves downward, causing the tungsten steel sheet of the upper pressure plate 10 to contact, thereby compressing the sample by the upper and lower tungsten steel sheets and completing the compression test. During the test, due to the installation of a transparent or semi-transparent protective cover 12, the test personnel can observe the changes in the sample at close range, thus more intuitively determining the failure mode of the sample. After the test is completed, the tooling is cleaned to avoid affecting the next test.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A compression test fixture for superhard materials, characterized in that, The device includes an upper pressure plate and a lower pressure plate arranged opposite to each other. An upper connector is provided above the upper pressure plate, and the upper pressure plate is connected to the testing machine through the upper connector. A lower support is provided at the bottom of the lower pressure plate, and the lower pressure plate is mounted on the testing machine through the lower support. Mounting grooves are provided on the opposite sides of the upper and lower pressure plates. Hard alloy parts are installed in the mounting grooves to reduce the wear and tear of the tooling during the compression test.

2. The compression test fixture for superhard materials as described in claim 1, characterized in that, A detachable fixing plate is provided in the mounting slot, and the cemented carbide part is installed in the mounting slot through the fixing plate.

3. The compression test fixture for superhard materials as described in claim 2, characterized in that, The upper surface of the cemented carbide part protrudes from the surfaces of the upper pressure plate and the lower pressure plate.

4. The compression test fixture for superhard materials as described in claim 1, characterized in that, The upper pressure plate is provided with an upper side mounting bracket, and the lower pressure plate is provided with a lower side mounting bracket. The upper side mounting bracket and the lower side mounting bracket are respectively arranged through the upper pressure plate and the lower pressure plate in the horizontal direction and extend to the outside of the upper pressure plate and the lower pressure plate, and the upper side mounting bracket and the lower side mounting bracket are arranged parallel to each other in the same extending direction.

5. The compression test fixture for superhard materials as described in claim 4, characterized in that, The upper mounting bracket has upper mounting holes at both ends located outside the upper pressure plate. A grating ruler displacement meter is installed in the upper mounting hole to monitor the compression deformation of the sample during the compression test.

6. The compression test fixture for superhard materials as described in claim 5, characterized in that, The lower mounting bracket has lower mounting holes at both ends located outside the lower pressure plate. The lower mounting holes correspond to the upper mounting holes. A contact rod is installed on the lower mounting hole. The grating ruler displacement gauge contacts the upper surface of the contact rod during downward movement to obtain the compression deformation of the sample in the compression test.

7. The compression test fixture for superhard materials as described in claim 6, characterized in that, Both ends of the upper and lower mounting brackets are provided with handles, and the grating ruler displacement meter and the contact rod are fastened by rotating the handles.

8. The compression test fixture for superhard materials as described in claim 5, characterized in that, The upper pressure plate is covered with a protective cover on its outer side, and the two ends of the upper mounting bracket extend out of the outer side of the protective cover, so that the grating ruler displacement meter is located outside the protective cover.

9. The compression test fixture for superhard materials as described in claim 8, characterized in that, The depth of the protective cover is greater than the height of the upper pressure plate, and the opening of the protective cover can partially cover the upper side of the lower pressure plate, so that the debris after the sample is damaged during the compression test will not fly out of the range of the protective cover.

10. A testing machine, characterized in that, The testing machine has a fixture mounting base, and the upper joint and the lower support of the compression test fixture for superhard materials as described in any one of claims 1-9 are respectively mounted on the fixture mounting base of the testing machine to complete the compression test of the testing machine.

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