Tensile sample clamp of stretcher

Abstract

The utility model belongs to the technical field of metal tensile tests, and relates to a tensile sample fixture of a stretcher, a stretcher clamping end is cylindrical, and the stretcher clamping end is provided with a stretcher stretching hole; the sample clamping end is cylindrical, a stepped hole is formed in the sample clamping end, a sample clamping hole is formed in the end face of the sample clamping end in the axial direction, the diameter of the clamping hole is larger than that of a sample to be stretched, a clamp hole is formed in the sample clamping end, and the clamp hole is larger than the clamping hole; step-shaft-shaped chucks which are oppositely opened in the radial direction are arranged in the clamp hole, and the size of an inner hole of each chuck is equal to the size of the outer diameter of a sample to be stretched; a clamping window is arranged on the side wall of the sample clamping end and penetrates through the clamp hole; the clamping device is high in reliability, the problem that a sample slides off and falls off in the stretching process is solved, relative displacement between the sample and the clamping device is avoided, abrasion of the chuck of the stretching machine is reduced, and the service life of the chuck of the stretching machine is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal tensile testing and relates to a tensile specimen fixture for a tensile machine. Background Art

[0002] A tensile test is a method used to evaluate the mechanical properties of a material when subjected to a tensile load. During the test, a specimen is clamped in a testing machine and subjected to a gradually increasing tensile force until it breaks. By recording the specimen's stress, strain, load, and elongation during the tensile process, key performance indicators such as the material's tensile strength, yield strength, and elongation can be determined. The primary function of a tensile fixture is to secure the specimen during the tensile test, thereby transmitting the tensile force during the tensile test.

[0003] However, the existing tensile machine tensile fixtures are not adaptable enough to bar specimens of specific sizes, and are prone to loose clamping or damage. During the stretching process, the friction between the fixture and the specimen is unstable, which will directly affect the stretching effect and test accuracy.

[0004] Therefore, a tensile specimen clamping device with convenient operation, stable clamping and accurate positioning is needed to solve this problem. Summary of the Invention

[0005] The utility model aims to ensure the reliability of the clamp in adapting to the bar sample, and to add a tensile machine chuck sample conversion clamp device, so that the tensile sample can be positioned more accurately on the tensile machine and the positioning and clamping time can be reduced.

[0006] The technical solution adopted by the utility model to solve the technical problem is: a tensile specimen clamp for a tensile machine, the tensile specimen clamp is in the shape of a stepped shaft, one end of the tensile specimen clamp is a tensile machine clamping end, and the other end of the tensile specimen clamp is a clamping specimen end; the tensile machine clamping end is cylindrical, and a tensile machine stretching hole is radially provided on the cylindrical side wall of the tensile machine clamping end.

[0007] The sample clamping end is cylindrical, and a coaxial stepped hole with a larger inner side and a smaller outer side is provided inside the cylinder of the sample clamping end. A sample clamping hole is provided on the end face of the sample clamping end along the axial direction, and the aperture of the clamping hole is larger than the diameter of the sample to be stretched. A fixture hole is provided inside the sample clamping end, and the aperture of the fixture hole is larger than the aperture of the clamping hole; a stepped shaft-shaped chuck that is radially split is provided in the fixture hole, and the inner hole size of the chuck is equal to the outer diameter of the sample to be stretched.

[0008] A clamping window is provided on the side wall of the clamping sample end, the clamping window passes through the fixture hole, and the width and height of the clamping window are both greater than the aperture of the clamping hole.

[0009] Preferably, the tensile specimen fixtures are arranged in pairs, the sample clamping ends of the paired tensile specimen fixtures clamp both ends of the specimen to be stretched, and the tensile machine clamping ends of the tensile specimen fixtures are respectively connected to the upper chuck and the lower chuck of the tensile machine.

[0010] Preferably, the clamping end of the stretching machine, the clamping end of the sample, and the clamping hole are coaxial.

[0011] Preferably, the rotation axis of the clamping end of the stretching machine is orthogonal to the rotation axis of the stretching hole of the stretching machine.

[0012] Preferably, the intersections of the end face of the clamping end of the stretching machine and the cylindrical surface, and the intersections of the end face of the clamping sample end and the cylindrical surface are respectively provided with chamfers; and the connection between the clamping end of the stretching machine and the clamping sample end is provided with a rounded corner.

[0013] The beneficial effects of the utility model are:

[0014] 1. The utility model has high reliability. During the stretching process, the sample will not slip or fall off, and there will be no relative displacement between the sample and the fixture.

[0015] 2. The utility model undertakes the main task of sample clamping and is made of high-strength alloy high-quality materials, which reduces the wear of the tensile machine chuck when it directly contacts the sample, extends the service life of the tensile machine chuck, and reduces the cost of tensile testing.

[0016] 3. The utility model improves the sample clamping efficiency, completes the sample replacement in a short time, increases the number of samples per unit time, and improves the test efficiency of the tensile test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view schematic diagram of a tensile specimen fixture for a tensile machine according to the present invention;

[0018] Figure 2 This is a schematic diagram of a clamping specimen of the present invention.

[0019] In the figure, 1. Clamping end of the tensile machine; 2. Clamping end of the specimen; 3. Stretching hole of the tensile machine; 4. Clamping hole of the specimen; 5. Specimen to be stretched; 6. Clamp hole; 7. Collet; 8. Clamping window. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the relevant technologies in the present invention. Obviously, the embodiments described are only 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 are within the scope of protection of the present invention.

[0021] refer to Figures 1-2 As shown, a tensile specimen fixture for a tensile machine according to this specific embodiment is in the shape of a stepped shaft, one end of the tensile specimen fixture is a tensile machine clamping end 1, and the other end of the tensile specimen fixture is a sample clamping end 2.

[0022] The stretching machine clamping end 1 is cylindrical, and a stretching machine stretching hole 3 is radially provided on the cylindrical side wall of the stretching machine clamping end 1 and passes through the cylindrical side wall of the stretching machine clamping end 1; the stretching machine clamping end 1 and the stretching machine stretching hole 3 can be used to connect a stretching machine.

[0023] The sample clamping end 2 is cylindrical, and a coaxial stepped hole with a larger inner side and a smaller outer side is provided inside the cylinder of the sample clamping end 2. A sample clamping hole 4 is provided axially on the end face of the sample clamping end 2, and the aperture of the clamping hole 4 is larger than the diameter of the sample 5 to be stretched. A clamp hole 6 is provided inside the sample clamping end 2, and the aperture of the clamp hole 6 is larger than the aperture of the clamping hole 4; a stepped shaft-shaped chuck 7 is provided in the clamp hole 6, which is radially split, and the inner hole size of the chuck 7 is equal to the outer diameter of the sample 5 to be stretched; the chuck 7 clamps the sample 5 to be stretched, and the sample clamping hole 4 clamps the chuck 7, and a taper with a small hole outside and a large hole inside is provided on the outer cylindrical surface of the clamp 7 where the clamp 7 frictionally contacts the clamping hole 4 along the axial direction of the clamping hole 4. As the sample 5 to be stretched and the chuck 7 move axially outward, the outer circumference of the chuck 7 and the inner hole of the clamping hole 4 become tighter and tighter, and the friction force becomes greater and greater, providing sufficient pulling force for the sample 5 to be stretched.

[0024] A clamping window 8 is provided on the side wall of the clamping sample end 2, which passes through the clamp hole 6. The width and height of the clamping window 8 are both larger than the aperture of the clamping hole 4; the clamping window 8 makes it convenient for the installer to buckle the split clamp 7 onto the sample to be stretched 5 and insert the front end of the clamp 7 into the clamping hole 4 when installing the sample to be stretched 5.

[0025] When clamping the sample 5 to be stretched, the sample 5 to be stretched extends axially from the clamping hole 4 into the clamp hole 6, and the chuck 7 clamps the cylindrical surface of the sample 5 to be stretched from both sides, and the outer contour of the chuck 7 clamps the clamping hole 4; the stretching machine clamping end 1 and the stretching machine stretching hole 3 are connected to the stretching machine.

[0026] Furthermore, the tensile specimen fixtures are arranged in pairs, the sample clamping ends 2 of the paired tensile specimen fixtures clamp both ends of the tensile specimen 5, and the tensile machine clamping ends 1 of the tensile specimen fixtures are respectively connected to the upper chuck and the lower chuck of the tensile machine.

[0027] Furthermore, the tensile machine clamping end 1, the sample clamping end 2, and the clamping hole 4 are coaxial.

[0028] Furthermore, the rotation axis of the clamping end 1 of the stretching machine is orthogonal to the rotation axis of the stretching hole 3 of the stretching machine.

[0029] Furthermore, the intersections of the end face of the tensile machine clamping end 1 and the cylindrical surface and the intersections of the end face of the clamping sample end 2 and the cylindrical surface are respectively provided with chamfers; the connection between the tensile machine clamping end 1 and the clamping sample end 2 is provided with a rounded corner.

[0030] This embodiment utilizes a tensile conversion fixture to achieve precise positioning of the sample, which is achieved by optimizing the fixture structure and clamping method; the clamp block is subjected to special surface heat treatment to improve its hardness. The increased hardness can withstand pressure and friction, is not easy to wear, and can extend the service life of the clamp block, effectively control the deformation of the sample, improve the applicability of the tensile machine and the efficiency of the sample experiment, and ensure product quality.

[0031] Working principle: 1. Fixture fixation; the clamping assembly is fixed in the positioning groove of the fixture body to ensure the matching accuracy of the specimen, the clamp block and the tensile machine fixture, and is accurately installed in the corresponding position of the fixture; 2. Device positioning; ensure that the clamping surface of the clamp block is perpendicular to the axis of the specimen to avoid uneven force on the specimen during the stretching process and cause test errors; when the stretching device needs to be replaced, the device is placed in a specific position so that the fixture is accurately positioned at the key position, and the fixture is clamped and fixed using the equipment to firmly fix the specimen and the fixture on the tensile machine; 3. When the tensile machine is working, the tensile force is transmitted to the tensile conversion fixture through the transmission system of the tensile machine, and the conversion fixture applies uniform tensile force; 4. The replacement process of the tensile conversion fixture is quick and easy, and the operator can complete the disassembly and installation of the specimen in a short time, which greatly shortens the experimental time and improves the efficiency of the specimen experiment.

[0032] In summary, the utility model has high reliability, the sample will not slip or fall off during the stretching process, there will be no relative displacement between the sample and the fixture, and the wear of the stretching machine chuck is reduced, thereby extending the service life of the stretching machine chuck.

[0033] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A tensile specimen fixture for a tensile machine, characterized in that: The tensile specimen fixture is in the shape of a stepped shaft, one end of the tensile specimen fixture is a tensile machine clamping end (1), and the other end of the tensile specimen fixture is a specimen clamping end (2); The stretching machine clamping end (1) is cylindrical, and a stretching machine stretching hole (3) is provided radially on the cylindrical side wall of the stretching machine clamping end (1); The sample holding end (2) is cylindrical, and a coaxial stepped hole with a larger inner side and a smaller outer side is provided inside the cylinder of the sample holding end (2). A sample holding hole (4) is provided on the end surface of the sample holding end (2) along the axial direction, and the aperture of the clamping hole (4) is larger than the diameter of the sample to be stretched (5). A clamp hole (6) is provided inside the sample holding end (2), and the aperture of the clamp hole (6) is larger than the aperture of the clamp hole (4). A stepped shaft-shaped clamp (7) is provided in the clamp hole (6) and is opened in the radial direction, and the inner hole size of the clamp (7) is equal to the outer diameter of the sample to be stretched (5). A clamping window (8) is provided on the side wall of the sample clamping end (2), the clamping window (8) passes through the clamp hole (6), and the width and height of the clamping window (8) are both greater than the aperture of the clamping hole (4).

2. A tensile specimen holder for a tensile machine according to claim 1, characterized in that: The tensile specimen clamps are arranged in pairs, the sample clamping ends (2) of the paired tensile specimen clamps clamp both ends of the sample (5) to be stretched, and the tensile machine clamping ends (1) of the tensile specimen clamps are respectively connected to the upper chuck and the lower chuck of the tensile machine.

3. The tensile specimen holder for a tensile machine according to claim 1, characterized in that: The tensile machine clamping end (1), the sample clamping end (2), and the clamping hole (4) are coaxial.

4. The tensile specimen holder for a tensile machine according to claim 1, characterized in that: The rotation axis of the stretching machine clamping end (1) is orthogonal to the rotation axis of the stretching machine stretching hole (3).

5. The tensile specimen holder for a tensile machine according to claim 1, characterized in that: The intersection of the end face of the tensile machine clamping end (1) and the cylindrical surface, and the intersection of the end face of the clamping sample end (2) and the cylindrical surface are respectively provided with chamfers; and the connection between the tensile machine clamping end (1) and the clamping sample end (2) is provided with a rounded corner.

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