A clamp and method for tensile testing of metallic materials

Abstract

The application provides a clamp for metal material tensile test, comprising a first test piece clamping part and a second test piece clamping part, the first test piece clamping part comprises a first tensile machine connecting section and a first test piece connecting section, the first test piece connecting section is movable between a first limit position and a second limit position, and the first test piece connecting section is provided with a threaded hole for connecting a test piece; the second test piece clamping part comprises a second test piece connecting end and a second tensile machine connecting end, and the second test piece connecting end is provided with a threaded hole for connecting a test piece. The clamp for metal material tensile test and the method provided by the application set a sliding channel on the transition connecting section, so that the first test piece connecting section can slide between the first limit position and the second limit position; when it is necessary to replace the test piece clamped by the clamp, the first test piece connecting section can move between the first limit position and the second limit position and has a certain freedom, so that the operator is prevented from being clamped by the tensile testing machine.

Description

Technical Field

[0001] This application relates to a fixture and method for tensile testing of metallic materials. Background Technology

[0002] Tensile testing of metallic materials is of great significance for determining the strength and properties of materials. Existing testing methods use hydraulic clamps to hold metallic material specimens, which poses significant safety hazards. Operators are prone to getting their hands caught when clamping the metal material specimens onto the hydraulic clamps. In addition, the small gaps between the clamps make it very inconvenient to measure the metal material being tested. Different clamps are required when changing specimens of different shapes, making the operation complicated and the testing efficiency low. Summary of the Invention

[0003] The purpose of this invention is to provide a fixture and method for tensile testing of metallic materials, which has the advantages of convenient testing and high safety.

[0004] To achieve the above objectives, the present invention provides a fixture for tensile testing of metallic materials, comprising:

[0005] The first specimen clamping part includes a first tensile machine connecting section and a first specimen connecting section. The first tensile machine connecting section and the first specimen connecting section are movably connected. The first specimen clamping part is provided with a first limit position and a second limit position. The first specimen connecting section can move relative to the first tensile machine connecting section along the specimen tensile direction between the first limit position and the second limit position. The first specimen connecting section is provided with a threaded hole for connecting the specimen.

[0006] The second specimen clamping part includes a second specimen connecting end and a second tensile machine connecting end, wherein the second specimen connecting end is provided with a threaded hole for connecting the specimen.

[0007] Preferably, the first specimen clamping part further includes a transition connecting section, which is detachably connected to the first tensile machine connecting section and the first specimen connecting section. The transition connecting section is provided with a slide along the tensile direction of the specimen, and the two ends of the slide correspond to the first limit position and the second limit position, respectively.

[0008] Preferably, a boss is provided at one end of the first specimen connecting section, the boss matches the slide of the transition connecting section, and a blocking part is provided at one end of the slide. When the boss abuts against the blocking part, the first specimen connecting section is in the second extreme position.

[0009] Preferably, the transition connecting section is threadedly connected to the first stretching machine connecting section, and the first stretching machine connecting section is located at one end of the slide when it is threadedly connected to the transition connecting section, and the first stretching machine connecting section is located at the first extreme position.

[0010] Preferably, the transition connecting section is an annular cylindrical shape, the slide is disposed in the hollow part of the transition connecting section along the axial direction of the transition connecting section, and an observation window is provided on the outer wall of the transition connecting section.

[0011] Preferably, the observation window is arranged along the length direction of the transition connection segment.

[0012] Preferably, a connecting pin hole is provided on the first tensile testing machine connecting section along the axial direction perpendicular to the first tensile testing machine connecting section, and the first tensile testing machine connecting section is connected to the tensile testing machine through the connecting pin hole.

[0013] Preferably, the fixture further includes a plate-shaped specimen adapter plate, which includes a clamping part connecting end, an insert plate groove, and a fixing pin hole. The clamping part connecting end is used to connect the first specimen clamping part or the second specimen clamping part, the insert plate groove is used to insert the plate-shaped specimen, and the axial direction of the fixing pin hole is perpendicular to the insert plate groove.

[0014] This application also provides a method for tensile testing of metallic materials, the method being implemented using the fixture for tensile testing of metallic materials as described above, the method comprising:

[0015] S10. Connect the test specimen to the first specimen clamping part and the second specimen clamping part respectively.

[0016] S20. Connect the first specimen clamping part and the second specimen clamping part to the tensile testing machine respectively;

[0017] S30. Start the tensile testing machine and stretch the specimen to be tested.

[0018] Preferably, in step S10, it is determined whether the test specimen is a circular specimen or a plate-shaped specimen; if the test specimen is a circular specimen, the test specimen is directly connected to the first specimen clamping part and the second specimen clamping part; if the test specimen is a plate-shaped specimen, both ends of the plate-shaped specimen are connected to the plate-shaped specimen adapter plate respectively, and then connected to the first specimen clamping part and the second specimen clamping part.

[0019] In summary, compared with the prior art, the fixture and method for tensile testing of metallic materials provided by the present invention have the following beneficial effects:

[0020] The fixture and method for tensile testing of metallic materials disclosed in this application, by setting a slide on the transition connection section, allows the first specimen connection section to slide between the first limit position and the second limit position. When it is necessary to change the specimen clamped by the fixture, the first specimen connection section has a certain degree of freedom of movement between the first limit position and the second limit position, thus avoiding the operator's hand being pinched by the tensile testing machine. Attached Figure Description

[0021] Figure 1 This is a first-view structural schematic diagram of the fixture used for tensile testing of metallic materials according to this application.

[0022] Figure 2 This is a second-view structural schematic diagram of the fixture used for tensile testing of metallic materials according to this application.

[0023] Figure 3 This is a cross-sectional structural schematic diagram of the fixture used for tensile testing of metallic materials according to this application.

[0024] Figure 4 This is a schematic diagram of the transition connection segment of this application.

[0025] Figure 5 This is a cross-sectional view of the transition connection section of this application.

[0026] Figure 6 This is a schematic diagram of the structure of the first specimen connection segment of this application.

[0027] Figure 7 This is a cross-sectional view of the connection section of the first specimen in this application.

[0028] Figure 8 This is a schematic diagram of the structure of the second specimen clamping part of this application.

[0029] Figure 9 This is a cross-sectional view of the clamping part of the second specimen in this application.

[0030] Figure 10 This is a first-view structural schematic diagram of the plate-shaped specimen adapter plate of this application.

[0031] Figure 11 This is a second-view structural schematic diagram of the plate-shaped specimen adapter plate of this application.

[0032] Figure 12 This is a cross-sectional structural diagram of the plate-shaped specimen adapter plate of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] Fixture 10

[0035] First specimen clamping section 100

[0036] First stretching machine connecting section 110

[0037] Connecting pin hole 111

[0038] First specimen connection section 120

[0039] 121 convex surface

[0040] Transition connection section 130

[0041] Slide 131

[0042] Blocking part 132

[0043] Observation window 133

[0044] Second specimen clamping section 200

[0045] Second specimen connection end 210

[0046] Second stretching machine connection end 220

[0047] Plate-shaped specimen adapter plate 300

[0048] Clamping part connection end 310

[0049] Insertion slot 320

[0050] 330 fixing pin hole

[0051] Test specimen 20 Detailed Implementation

[0052] The following will be combined with the appendix in the embodiments of the present invention. Figure 1 ~Attached Figure 12 The technical solutions, structural features, objectives and effects achieved in the embodiments of the present invention will be described in detail.

[0053] It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions. They are only used to facilitate and clarify the purpose of illustrating the embodiments of the present invention, and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationship, or adjustments to the size should still fall within the scope of the technical content disclosed in the present invention, provided that they do not affect the effects and objectives that the present invention can produce.

[0054] It should be noted that, in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only the expressly listed elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0055] like Figures 1-3 As shown, the present invention provides a fixture 10 for tensile testing of metallic materials. The fixture 10 includes a first specimen clamping part 100 and a second specimen clamping part 200. The first specimen clamping part 100 and the second specimen clamping part 200 are used to clamp test specimens 20 at both ends, and the first specimen clamping part 100 and the second specimen clamping part 200 are respectively connected to a tensile testing machine, so that the tensile testing machine performs tensile testing on the test specimens 20 through the first specimen clamping part 100 and the second specimen clamping part 200. The first specimen clamping part 100 includes a first tensile testing machine connecting section 110 and a first specimen connecting section 120. The first tensile testing machine connecting section 110 is used to connect to the tensile testing machine, and the first specimen connecting section 120 is used to connect the test specimens 20. The first tensile testing machine connecting section 110 and the first specimen connecting section 120 are movably connected. This movable connection means that the first specimen connecting section 120 can move relative to the first tensile testing machine connecting section 110. The first specimen clamping part 100 is provided with a first limit position and a second limit position. The first specimen connecting section 120 can move relative to the first tensile testing machine connecting section 110 between the first limit position and the second limit position along the tensile direction of the test specimen 20. The tensile direction of the test specimen 20 is... Figures 1-3The vertical direction. When it is necessary to change the test specimen 20, the tensile testing machine needs to be operated to move the first specimen clamping part 100 and the second specimen clamping part 200 to a suitable position so that the test specimen 20 can be installed in the first specimen clamping part 100 and the second specimen clamping part 200. In this embodiment, the first specimen connecting section 120 in the first specimen clamping part 100 can move relative to the first tensile testing machine connecting section 110. When the tensile testing machine controls the movement of the first specimen clamping part 100 and the second specimen clamping part 200, the distance that the first specimen connecting section 120 moves relative to the first tensile testing machine connecting section 110 within the first limit position and the second limit position can be used as the margin of the tensile testing machine's movement distance. This avoids the tensile testing machine moving too far and clamping the operator's hand or causing the test specimen 20 to be unable to be installed. It eliminates the need to repeatedly move the tensile testing machine and improves the convenience of operating the tensile testing machine. The first specimen connecting section 120 is provided with a threaded hole for connecting the test specimen 20. The threaded hole is used to connect with the test specimen 20. When replacing the test specimen 20, the tensile testing machine is operated to move the first specimen clamping part 100 and the second specimen clamping part 200 relative to each other, so that the first specimen connecting section 120 is in the first limit position or between the first limit position and the second limit position. During the tensile test, if the first specimen connecting section 120 is not in the second limit position due to the adjustment of the first specimen clamping part 100 and the second specimen clamping part 200, the tensile testing machine first moves the first specimen clamping part 100 and the second specimen clamping part 200 away from each other until the first specimen connecting section 120 moves to the second limit position. Then the tensile testing machine continues to stretch the first specimen clamping part 100 and the second specimen clamping part 200. At this time, the first specimen clamping part 100 and the second specimen clamping part 200 can no longer move away from each other, and the tensile load between the first specimen clamping part 100 and the second specimen clamping part 200 is completely borne by the test specimen 20, thus starting the tensile test of the test specimen 20. That is, during the tensile test, after the first specimen connection segment 120 moves to the second limit position, the test specimen 20 begins to bear the tensile load.

[0056] like Figures 8-9 As shown, the second specimen clamping part 200 includes a second specimen connecting end 210 and a second tensile testing machine connecting end 220. The second specimen clamping part 200 is generally cylindrical. One end of the second specimen clamping part 200 has a threaded hole for connecting with the test specimen 20, and the other end of the second specimen clamping part 200 has an external thread for connecting with the tensile testing machine. Furthermore, the second specimen clamping part 200 has threaded holes of various sizes to accommodate test specimens 20 of different sizes.

[0057] continue Figures 1-3As shown, the first specimen clamping part 100 also includes a transition connecting section 130. The transition connecting section 130 is generally annular in shape. The transition connecting section 130 is detachably connected to the first tensile testing machine connecting section 110 and the first specimen connecting section 120. A threaded hole is provided on the side of the transition connecting section 130 that connects to the first tensile testing machine connecting section 110. The first tensile testing machine connecting section 110 has a matching external thread, and the first tensile testing machine connecting section 110 and the transition connecting section 130 are connected by threads. Figure 5 As shown, the transition connection section 130 is provided with a slide 131 along the tensile direction of the test specimen 20, and the slide 131 is along... Figure 1-3 The slide 131 is set vertically, with the two ends of the slide 131 corresponding to the first limit position and the second limit position, respectively. The top of the slide 131 is the first limit position, and the bottom of the slide 131 is the second limit position.

[0058] like Figures 6-7 As shown, a boss 121 is provided at one end of the first specimen connecting section 120. The outer diameter of the boss 121 matches the inner diameter of the slide 131 of the transition connecting section 130. The diameter of the boss 121 matches the inner diameter of the slide 131, and the diameter of other parts of the first specimen connecting section 120 is smaller than the diameter of the boss 121, so that the first specimen connecting section 120 can move along the slide 131 of the transition connecting section 130. A blocking part 132 is provided at one end of the slide 131. When the boss 121 moves vertically to the blocking part 132, the diameter of the blocking part 132 is smaller than the diameter of the boss 121. As a result, the boss 121 abuts against the blocking part 132 and cannot continue to move downward. When the boss 121 abuts against the blocking part 132, the first specimen connecting section 120 is in the second limit position. Thus, the position of the boss 121 on the transition connecting section 130 determines the second limit position of the first specimen connecting section 120 on the transition connecting section 130.

[0059] The transition connecting section 130 is threadedly connected to the first tensile testing machine connecting section 110. The transition connecting section 130 has a threaded hole, and the first tensile testing machine connecting section 110 has an external thread that matches the threaded hole of the transition connecting section 130. The threaded connection between the first tensile testing machine connecting section 110 and the transition connecting section 130 facilitates disassembly. After separating the first tensile testing machine connecting section 110 from the transition connecting section 130, the first specimen connecting section 120 can be removed from the top of the slide rail 131 to replace it and adapt it to test specimens 20 of different sizes. When the first tensile testing machine connecting section 110 and the transition connecting section 130 are threadedly connected, they are located at one end of the slide rail 131. When the first specimen connecting section 120 moves upward along the slide rail 131, the first specimen connecting section 120 abuts against the first tensile testing machine connecting section 110. Thus, the connection position between the first tensile testing machine connecting section 110 and the transition connecting section 130 determines the first limit position of the top of the first specimen connecting section 120 moving along the slide rail 131.

[0060] like Figures 4-5 As shown, the transition connecting section 130 is an annular cylindrical shape. The overall exterior of the transition connecting section 130 is cylindrical. A slide rail 131 is provided inside the transition connecting section 130, and the slide rail 131 is positioned along the axial direction of the transition connecting section 130 in its hollow portion. Threaded holes and blocking portions 132 are respectively provided at both ends of the hollow portion of the transition connecting section 130. The threaded hole at the upper part of the transition connecting section 130 is used for connection to the first tensile machine connecting section 110, and the blocking portion 132 at the lower part of the transition connecting section 130 abuts against the boss 121 of the first specimen connecting section 120, thereby limiting the movement of the first specimen connecting section 120. An observation window 133 is provided on the outer wall of the transition connecting section 130 to facilitate observation of the position of the first specimen connecting section 120 as it moves within the slide rail 131. Furthermore, to better observe the position of the first specimen connecting section 120 within the slide rail 131, the observation window 133 is positioned along the length of the transition connecting section 130.

[0061] continue Figure 1 and Figure 3 As shown, a connecting pin hole 111 is provided on the first tensile testing machine connecting section 110 along the axis perpendicular to the axis of the first tensile testing machine connecting section 110. The first tensile testing machine connecting section 110 is connected to the tensile testing machine through the connecting pin hole 111. The connecting pin hole 111 is set perpendicular to the axis of the first tensile testing machine connecting section 110, and the connection between the first tensile testing machine connecting section 110 and the tensile testing machine through the connecting pin hole 111 facilitates quick assembly and disassembly of the first tensile testing machine connecting section 110 and the tensile testing machine.

[0062] like Figures 10-12As shown, the fixture 10 also includes a plate-shaped specimen adapter plate 300. The plate-shaped specimen adapter plate 300 connects the plate-shaped specimen to the first specimen clamping part 100 and the second specimen clamping part 200, thereby connecting the plate-shaped specimen to the tensile testing machine. The tensile testing machine transfers the load to the plate-shaped specimen through the connection of the first specimen clamping part 100 and the second specimen clamping part 200, thus performing a tensile test on the plate-shaped specimen. The plate-shaped specimen adapter plate 300 includes a clamping part connecting end 310, an insert plate groove 320, and a fixing pin hole 330. The clamping part connecting end 310 connects to either the first specimen clamping part 100 or the second specimen clamping part 200. In this embodiment, the clamping end 310 of the plate-shaped specimen adapter plate 300 has an external thread. Threaded holes are respectively provided on the first specimen clamping part 100 and the second specimen clamping part 200. Specifically, a threaded hole is provided at the bottom of the first specimen connecting section 120 of the first specimen clamping part 100. The external thread of the clamping end 310 of the plate-shaped specimen adapter plate 300 matches the threaded hole on the first specimen connecting section 120, thereby realizing the connection between the plate-shaped specimen adapter plate 300 and the first specimen connecting section 120. A threaded hole is provided at one end of the second specimen clamping part 200. The external thread of the clamping end 310 of the plate-shaped specimen adapter plate 300 matches the threaded hole of the second specimen clamping part 200, thereby realizing the connection between the plate-shaped specimen adapter plate 300 and the second specimen clamping part 200. Thus, the clamping connection end 310 can be quickly connected and disassembled with the first specimen clamping part 100 and the second specimen clamping part 200 via threads. The insert slot 320 is used to insert the plate-shaped specimen. The width of the insert slot 320 matches the width of the plate to be tested. Specifically, the insert slot 320 is opened vertically, that is, along the direction of the tensile test specimen 20. Therefore, after the test specimen 20 is installed in the insert slot 320, tensile testing can be performed directly without changing its orientation. The axis of the fixing pin hole 330 is perpendicular to the insert slot 320. The pin passes through the fixing pin hole 330 of the insert slot 320 and the opening on the plate-shaped specimen to connect the plate-shaped specimen adapter plate 300 and the plate-shaped specimen. Furthermore, the installation direction of the pin connecting the insert slot 320 and the plate is perpendicular to the load application direction of the tensile testing machine, thereby enabling load transfer between the tensile testing machine and the plate and facilitating disassembly and assembly.

[0063] This application also provides a method for tensile testing of metallic materials, the method employing the aforementioned fixture for tensile testing of metallic materials, the method comprising:

[0064] S10. Connect the test specimen 20 to the first test specimen clamping part 100 and the second test specimen clamping part 200 respectively. Wherein, if the test specimen 20 is a cylindrical specimen, connect the thread of the end of the test specimen to the first test specimen clamping part 100 and the second test specimen clamping part 200 respectively; if the test specimen 20 is a plate-shaped specimen, install a plate-shaped specimen adapter plate 300 on the first test specimen clamping part 100 and the second test specimen clamping part 200 respectively, and connect the plate-shaped specimen to the first test specimen clamping part 100 and the second test specimen clamping part 200 through the plate-shaped specimen adapter plate 300.

[0065] S20. Connect the first specimen clamping part 100 and the second specimen clamping part 200 to the tensile testing machine respectively. Connect the first specimen clamping part 100 and the second specimen clamping part 200, on which the test specimen 20 is installed, to the tensile testing machine respectively.

[0066] S30. Start the tensile testing machine and stretch the test specimen 20. After the tensile testing machine applies the load to the test specimen 20, read the load reading on the tensile testing machine and record the corresponding failure condition of the test specimen 20. Finally, obtain the tensile test result of the test specimen 20.

[0067] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A fixture for tensile testing of metallic materials, characterized in that, The fixture includes: a first specimen clamping part, which includes a first tensile machine connecting section and a first specimen connecting section, the first tensile machine connecting section and the first specimen connecting section being movably connected, the first specimen clamping part having a first limit position and a second limit position, the first specimen connecting section being movable relative to the first tensile machine connecting section along the specimen tensile direction between the first limit position and the second limit position, and the first specimen connecting section having a threaded hole for connecting the specimen; and a second specimen clamping part, which includes a second specimen connecting end and a second tensile machine connecting end, the second specimen connecting end having a threaded hole for connecting the specimen. The first specimen clamping part further includes a transition connecting section, which is detachably connected to the first tensile machine connecting section and the first specimen connecting section. The transition connecting section is provided with a slide along the tensile direction of the specimen, and the two ends of the slide correspond to the first limit position and the second limit position, respectively. The first specimen connecting section has a boss at one end, which matches the slide of the transition connecting section. A blocking part is provided at one end of the slide. When the boss abuts against the blocking part, the first specimen connecting section is in the second extreme position. The transition connection section is threadedly connected to the first stretching machine connection section. When the first stretching machine connection section is threadedly connected to the transition connection section, it is located at one end of the slide, and the first stretching machine connection section is located at the first extreme position.

2. The fixture for tensile testing of metallic materials as described in claim 1, characterized in that, The transition connecting section is cylindrical, and the slide is located in the hollow part of the transition connecting section along the axial direction of the transition connecting section. An observation window is provided on the outer wall of the transition connecting section.

3. The fixture for tensile testing of metallic materials as described in claim 2, characterized in that, The observation window is positioned along the length of the transition connection segment.

4. The fixture for tensile testing of metallic materials as described in claim 1, characterized in that, A connecting pin hole is provided on the first tensile testing machine connecting section along the axial direction perpendicular to the first tensile testing machine connecting section, and the first tensile testing machine connecting section is connected to the tensile testing machine through the connecting pin hole.

5. The fixture for tensile testing of metallic materials as described in claim 1, characterized in that, The fixture also includes a plate-shaped specimen adapter plate, which includes a clamping part connecting end, an insert plate groove, and a fixing pin hole. The clamping part connecting end is used to connect the first specimen clamping part or the second specimen clamping part. The insert plate groove is used to insert the plate-shaped specimen. The axial direction of the fixing pin hole is perpendicular to the insert plate groove.

6. A method for tensile testing of metallic materials, characterized in that, The method is implemented using a fixture for tensile testing of metallic materials as described in any one of claims 1-5. The method includes: S10, connecting the specimen to be tested to the first specimen clamping part and the second specimen clamping part respectively; S20, connecting the first specimen clamping part and the second specimen clamping part to the tensile testing machine respectively; S30, starting the tensile testing machine and stretching the specimen to be tested.

7. The method for tensile testing of metallic materials as described in claim 6, characterized in that, In step S10, it is determined whether the test specimen is a circular specimen or a plate-shaped specimen; if the test specimen is a circular specimen, the test specimen is directly connected to the first specimen clamping part and the second specimen clamping part; if the test specimen is a plate-shaped specimen, both ends of the plate-shaped specimen are connected to the plate-shaped specimen adapter plate respectively, and then connected to the first specimen clamping part and the second specimen clamping part.

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