Thin strip high-temperature stretching clamping device for electronic universal testing machine
Through the clamping design of high-temperature tensile clamp and thread fit, the problem of poor deformation and matching of samples in traditional devices is solved, and the accuracy and efficiency of high-temperature tensile tests are improved. It is suitable for thin strip samples of various specifications.
Patent Information
- Application Number
- CN202422446012.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-10-10
AI Technical Summary
In the high-temperature tensile clamping device of traditional thin strips, there are problems of uneven deformation of the sample, stress concentration and poor matching degree in high-temperature tensile tests, resulting in large errors in the test results, high complexity and increased cost.
A high-temperature tensile clamp for mounting studs with integrated rectangular body and a test machine is adopted. By cooperating with the threads of the first and second clamping studs with the pins, close contact clamping is achieved, the deformation of the sample pin hole is reduced, and specimens of different thicknesses are adapted to the design of single grooves and flat end faces.
It effectively reduces the deformation of the sample pin hole, ensures the axial consistency and clamping tightness of the sample, improves the accuracy and efficiency of the test, reduces system errors, and enhances the applicability and flexibility of the device.
Smart Images
Figure CN223064990U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of testing the strength characteristics of solid materials by mechanical stress, and specifically relates to a high-temperature tensile clamping device for thin strip materials used in an electronic universal testing machine. Background Art
[0002] With the in-depth application of metal thin strip materials in fields such as aerospace and rail transit, it has become an urgent need in the industry to comprehensively and accurately test their mechanical properties in a high-temperature environment.
[0003] As a key means to evaluate the properties of such materials, high-temperature tensile tests are becoming increasingly important. However, traditional clamping devices still have problems that affect the accuracy and effectiveness of test results during high-temperature tensile tests.
[0004] Specifically, traditional high-temperature tensile tests of thin strip materials usually use test specimens with pin holes at both ends of the parallel section. Such specimens are connected to high-temperature tensile fixtures through pins, and gaskets are added on both sides of the specimen pin holes to meet the basic standards of tensile tests. However, for metals with good plasticity, the position of the hole for clamping the specimen has a significant impact on the deformation behavior of the specimen. Due to the stress concentration phenomenon near the hole, the specimen often undergoes non-uniform deformation and even tears. This means that part of the force value during the test is decomposed into the non-working section (i.e., the non-test section), resulting in a large deviation in the test results. In addition, traditional tensile fixtures with pin holes also face the problem of poor matching between the specimen and the fixture. When the matching between the specimen and the fixture is not good, the specimen may break at a position that does not conform to the regulations of the test method after tensile testing, such as breaking inside the fixture. This not only damages the fixture but also may render the test results invalid. This situation usually requires reprocessing the specimen and conducting repeated tests, greatly increasing the complexity and cost of the test. Content of the Utility Model
[0005] Aiming at the problems existing in the background art, the utility model provides a high-temperature tensile clamping device for thin strip materials used in an electronic universal testing machine. The technical solution includes: a high-temperature tensile fixture, a first clamping stud, a pin, and a second clamping stud. The high-temperature tensile fixture includes a cuboid main body and a testing machine mounting stud formed integrally. The testing machine mounting stud is arranged at the center of the first end face of the cuboid main body. A specimen receiving groove is vertically inwardly opened along the second end face of the cuboid main body. The first end face and the second end face are opposite faces. A threaded through hole perpendicular to the specimen receiving groove is opened in the center of the cuboid main body. The first clamping stud and the second clamping stud are installed in the threaded through hole through threaded cooperation.
[0006] The strip specimen is arranged in the specimen accommodating groove, and the strip specimen is located on the axis of the test machine mounting stud; a first pin hole is provided in the center of the first clamping stud, a second pin hole is provided in the center of the second clamping stud, and the pin sequentially passes through the first pin hole, the opening of the strip specimen, and the second pin hole.
[0007] The first end face of the first clamping stud is the first clamping flat end face; the first end face of the second clamping stud is the second clamping flat end face; the first clamping flat end face and the second clamping flat end face press the strip specimen from two directions respectively.
[0008] The first clamping flat end face and the second clamping flat end face are flat faces with equal dimensions.
[0009] A first slotted cross recess is provided on the second end face of the first clamping stud.
[0010] A second slotted cross recess is provided on the second end face of the second clamping stud.
[0011] The beneficial effects of the present utility model are as follows:
[0012] 1. The adjustment method of the thread enables the periphery of the pin hole of the strip specimen to be in close contact with the cross section of the stud, thereby effectively reducing the deformation of the pin hole of the strip specimen; therefore, the design of tightly clamping the strip specimen from both ends to the center by the studs can ensure the consistency of the axial direction of the strip specimen and the stress direction, not only minimizing the gap between the strip specimen and the fixture, but also reducing the deformation degree of the pin hole of the strip specimen to the lowest level, effectively reducing the systematic error.
[0013] 2. The rotation of the stud can adapt to strip specimens of different thicknesses, and this flexibility enables the device to be widely applicable to thin strip specimens of various specifications; by changing the clamping method and the clamping tightness, not only the accuracy and efficiency of the test are improved, but also the applicability and flexibility of the device are enhanced.
[0014] 3. Pin holes are provided in the centers of both the first clamping stud and the second clamping stud, and this special structure enables the stud to provide sufficient elasticity and clamping force when screwed into the fixture. Description of the Drawings
[0015] Figure 1 It is a schematic structural diagram of an embodiment of a high-temperature tensile clamping device for thin strip materials of an electronic universal testing machine according to the present utility model;
[0016] Figure 2 It is a front view schematic diagram of the high-temperature tensile fixture in the embodiment of the present utility model;
[0017] Figure 3 It is a side view schematic diagram of the high-temperature tensile fixture in the embodiment of the present utility model;
[0018] Figure 4It is the front view schematic diagram of the first clamping stud in the new embodiment of the present invention;
[0019] Figure 5 It is the side view schematic diagram of the first clamping stud in the new embodiment of the present invention.
[0020] Wherein: 1. High-temperature tensile fixture, 12. Threaded through-hole, 3. First clamping stud, 4. Pin, 6. Second clamping stud, 7. Strip specimen, 11. Testing machine installation stud, 12. Threaded through-hole, 13. Cuboid main body, 14. Specimen accommodation groove, 31. First pin hole, 32. First one-word groove, 61. Second pin hole, 62. Second one-word groove. Specific embodiments
[0021] The following further describes the present utility model in detail with reference to the accompanying drawings.
[0022] As Figures 1 to 5 shown in the embodiment of the present utility model, it includes: a high-temperature tensile fixture 1, a first clamping stud 3, a pin 4 and a second clamping stud 6. The high-temperature tensile fixture 1 includes a cuboid main body 13 and a testing machine installation stud 11 integrally formed. The testing machine installation stud 11 is arranged at the center of the first end face of the cuboid main body 13. A specimen accommodation groove 14 is vertically inwardly opened along the second end face of the cuboid main body 13. The first end face and the second end face are opposite faces; a threaded through-hole 12 perpendicular to the specimen accommodation groove 14 is opened at the center of the cuboid main body 13. The first clamping stud 3 and the second clamping stud 6 are installed in the threaded through-hole 12 by thread fitting;
[0023] The strip specimen 7 is arranged in the specimen accommodation groove 14. The strip specimen 7 is located on the axis of the testing machine installation stud 11; a coaxial first pin hole 31 is arranged at the center of the first clamping stud 3, and a coaxial second pin hole 61 is arranged at the center of the second clamping stud 6. The pin 4 sequentially passes through the first pin hole 31, the opening of the strip specimen 7 and the second pin hole 61.
[0024] A first one-word groove 32 is provided on one end face of the first clamping stud 3, and the other end face of the first clamping stud 3 is a first clamping flat end face;
[0025] A second one-word groove 62 is provided on one end face of the second clamping stud 6, and the other end face of the second clamping stud 6 is a second clamping flat end face;
[0026] The first clamping flat end face and the second clamping flat end face respectively press the strip specimen 7 from two directions;
[0027] In this embodiment, the outer diameters of the first clamping stud 3 and the second clamping stud 6 are 30 mm, and the size of the opening of the strip specimen is 10 mm; the first clamping flat end face and the second clamping flat end face are flat faces with equal sizes, and the inner and outer diameters are 10 mm and 30 mm respectively.
[0028] When performing clamping, first insert one end of the thin strip specimen into the specimen receiving groove 14 of a high-temperature tensile fixture 1 to ensure the correct position of the specimen. Then, from both sides, rotate the first slotted screw 32 and the second slotted screw 62 by inserting a flat-tip screwdriver to screw the first clamping stud 3 and the second clamping stud 6 into the threaded through holes 12 of the high-temperature tensile fixture 1.
[0029] Adjust the strip specimen 7 so that the opening of the strip specimen 7 in the specimen receiving groove 14 is aligned with the first pin hole 31 (or the second pin hole 61); gradually adjust the tightening degree of the first clamping stud 3 and the second clamping stud 6 until the specimen is firmly clamped in the fixture. During this process, ensure the flatness of the specimen 7 to reduce the systematic error during the test.
[0030] Subsequently, insert a pin 4 through the first pin hole 31 (or the second pin hole 61) to further fix the specimen to the fixture. This step is crucial because it can ensure that the specimen does not move relative to the fixture during the stretching process, thus guaranteeing the accuracy of the test results.
[0031] When the specimen is firmly clamped and fixed, the high-temperature tensile test can be carried out. During the test, due to the cooperation of the first clamping stud 3, the second clamping stud 6 and the pin 4, the deformation degree of the specimen pin hole is minimized, thus ensuring the validity of the test results.
[0032] In addition, this device also has good applicability. Since the tightening positions of the first clamping stud 3 and the second clamping stud 6 are adjustable, it can adapt to specimens of different thicknesses. When the thickness of the specimen changes, just adjust the positions of the first clamping stud 3 and the second clamping stud 6 to ensure a tight fit between the specimen and the fixture.
Claims
1. A high-temperature tensile clamping device for thin strip materials of an electronic universal testing machine, characterized in that, Comprising: A high-temperature tensile fixture (1), a first clamping stud (3), a pin (4) and a second clamping stud (6), wherein the high-temperature tensile fixture (1) includes a rectangular parallelepiped main body (13) and a testing machine mounting stud (11) integrally formed. The testing machine mounting stud (11) is arranged at the center of the first end face of the rectangular parallelepiped main body (13). A specimen accommodating groove (14) is vertically inwardly opened along the second end face of the rectangular parallelepiped main body (13). The first end face and the second end face are opposite faces; A threaded through hole (12) perpendicular to the specimen accommodating groove (14) is opened at the center of the rectangular parallelepiped main body (13). The first clamping stud (3) and the second clamping stud (6) are installed in the threaded through hole (12) by threaded fit; A strip specimen (7) is arranged in the specimen accommodating groove (14), and the strip specimen (7) is located on the axis of the testing machine mounting stud (11); A first pin hole (31) is arranged at the center of the first clamping stud (3), and a second pin hole (61) is arranged at the center of the second clamping stud (6). The pin (4) sequentially passes through the first pin hole (31), the opening of the strip specimen (7) and the second pin hole (61).
2. The high-temperature tensile clamping device for thin strip materials used in an electronic universal testing machine according to claim 1, wherein, The first end face of the first clamping stud (3) is a first clamping flat end face; The first end face of the second clamping stud (6) is a second clamping flat end face; The first clamping flat end face and the second clamping flat end face respectively press the strip specimen (7) from two directions.
3. The high-temperature tensile clamping device for thin strip materials used in an electronic universal testing machine according to claim 1, characterized in that, The first clamping flat end face and the second clamping flat end face are flat surfaces with equal dimensions.
4. A high-temperature tensile clamping device for thin strip materials of an electronic universal testing machine according to claim 1 or 2, characterized in that, A first slotted crosshead (32) is provided on the second end face of the first clamping stud (3).
5. A high-temperature tensile clamping device for thin strip materials of an electronic universal testing machine according to claim 1 or 2, characterized in that, A second slotted crosshead (62) is provided on the second end face of the second clamping stud (6).