A ductility test fixture

Abstract

The utility model discloses a ductility test fixture, including base, fixed clamp, mounting panel and movable clamp, the base fixed connection has first stress cylinder, second stress cylinder and guide rod, the fixed clamp is installed in the base, the mounting panel is connected with the drive end of first stress cylinder and the drive end of second stress cylinder respectively, and the mounting panel with guide rod sliding fit, the movable clamp is connected with the mounting panel, the fixed clamp is used for clamping one end of the measured piece, and the movable clamp is used for clamping the other end of the measured piece, first stress cylinder and second stress cylinder are used for providing the stress required by the measured piece, the utility model discloses technical scheme aims at helping to realize the ductility test of metal material, simplifies the testing process, and reduces the test cost.

Description

Technical Field

[0001] This utility model relates to the field of metal sheet performance testing technology, and in particular to a ductility testing fixture. Background Technology

[0002] Ductility testing is a crucial step in evaluating the mechanical properties of metallic materials. In industrial production, especially for incoming material inspection in industries such as metal stamping and wire rod manufacturing, a testing method is needed that can intuitively determine whether a material sample meets a preset strength standard. This type of test typically does not require precise stress-strain curve data, but only needs to provide a binary result of "pass" or "fail," thereby achieving efficient and low-cost quality control of large batches of raw materials.

[0003] However, current methods for conducting such tests mainly rely on large universal testing machines. These machines have significant drawbacks, including high purchase costs, large footprint, the need for specialized technicians to operate them, and complex and time-consuming testing procedures.

[0004] Therefore, there is an urgent need for a specialized fixture that is compact, easy to operate, provides stable and reliable test results, and can significantly reduce labor and equipment costs, so as to achieve foolproof and rapid measurement. Utility Model Content

[0005] The purpose of this invention is to provide a ductility testing fixture, which aims to assist in the ductility testing of metallic materials, simplify the testing process, and reduce testing costs.

[0006] To achieve this objective, the present invention adopts the following technical solution: A ductility testing fixture includes a base, a fixed clamp, a mounting plate, and a movable clamp. The base is fixedly connected to a first stress cylinder, a second stress cylinder, and a guide rod. The fixed clamp is mounted on the base. The mounting plate is connected to the drive ends of both the first and second stress cylinders, and the mounting plate is slidably engaged with the guide rod. The movable clamp is connected to the mounting plate. The fixed clamp is used to clamp one end of the workpiece under test, and the movable clamp is used to clamp the other end of the workpiece under test. The first and second stress cylinders provide the required stress to the workpiece under test.

[0007] In one embodiment, the guide rod is further provided with a limiting structure and a protective structure; the limiting structure is located below the mounting plate, and the protective structure is located above the mounting plate.

[0008] In one embodiment, the limiting structure is an elastic rubber ring.

[0009] In one embodiment, the fixing fixture includes a linear drive, a fixture base, and two opposing first jaws and second jaws; The clamp seat is fixedly mounted on the base, and the clamp seat forms a pair of spatially intersecting first and second inclined surfaces; one side of the first jaw contacts the first inclined surface, and one side of the second jaw contacts the second inclined surface; the linear drive member is fixed relative to the clamp seat, and the driving end of the linear drive member abuts against the first jaw and the second jaw; under the drive of the linear drive member, the first jaw and the second jaw can slide relative to the first inclined surface and the second inclined surface respectively, so that the clamping surface of the first jaw fits against the clamping surface of the second jaw.

[0010] In one embodiment, the clamping surface of the first gripper is formed with a first spherical protrusion, and the clamping surface of the second gripper is formed with a first spherical groove; when the clamping surface of the first gripper and the clamping surface of the second gripper are in contact, the first spherical protrusion can be received in the first spherical groove.

[0011] In one embodiment, the movable clamp includes a mounting base, a third jaw, a fourth jaw, and a screwing component; The mounting base is fixed to the mounting plate, the mounting plate has a pin, the third jaw and the fourth jaw are movably engaged with the pin, the screwing component passes through the third jaw and is rotatably engaged with the fourth jaw, and the screwing component has an external thread, the external thread engages with the third jaw; rotating the screwing component can make the clamping surfaces of the third jaw and the fourth jaw fit tightly together.

[0012] In one embodiment, the movable clamp further includes a return spring; the return spring is sleeved on the screwing member and abuts against the third jaw and the fourth jaw.

[0013] In one embodiment, the third gripper has two symmetrically arranged first connectors; the fourth gripper has a second connector. The first connector and / or the second connector are movable relative to the pin in the direction of movement of the third gripper.

[0014] In one embodiment, the clamping surface of the third jaw is formed with a second spherical protrusion, and the clamping surface of the fourth jaw is formed with a second spherical groove; when the clamping surface of the third jaw and the clamping surface of the fourth jaw are in contact, the second spherical protrusion can be received in the second spherical groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: Compared to expensive and complex universal testing machines, this invention utilizes a first and second stress cylinder mounted on the base to jointly drive the mounting plate. Combined with the sliding guidance of a guide rod, this provides stable and centered axial tensile stress to the workpiece under test, avoiding testing errors caused by uneven force application. Simultaneously, fixed and movable clamps clamp both ends of the workpiece, forming a complete testing mechanism. This design highly integrates the functions of expensive general-purpose testing equipment, dedicated to "pass / fail" testing and judgment, achieving low-cost, fixture-based manufacturing. This further assists in the ductility testing of metallic materials, simplifying the testing process and reducing testing costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the ductility testing fixture of this utility model; Figure 2 for Figure 1 AA-direction cross-sectional structure diagram; Figure 3 for Figure 1 BB-direction cross-sectional structure diagram; Illustrations: 100, ductility testing fixture; 110, base; 112, first stress cylinder; 113, second stress cylinder; 114, guide rod; 115, limiting structure; 116, protective structure; 120. Fixture; 121. Linear drive component; 122. Fixture base; 123. First gripper; 1231. First spherical protrusion; 124. Second gripper; 1241. First spherical groove; 130. Mounting plate; 140. Movable clamp; 141. Mounting base; 1411. Pin; 142. Third gripper; 1421. First connector; 143. Fourth gripper; 1431. Second connector; 144. Tightening component; 145. Return spring. Detailed Implementation

[0019] To make the technical objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not 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. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] This utility model embodiment provides a ductility testing fixture 100.

[0023] Please see Figures 1 to 3 The extensibility testing fixture 100 includes a base 110, a fixed clamp 120, a mounting plate 130, and a movable clamp 140. The base 110 is fixedly connected to a first stress cylinder 112, a second stress cylinder 113, and a guide rod 114. The fixed clamp 120 is mounted on the base 110. The mounting plate 130 is connected to the driving ends of the first stress cylinder 112 and the second stress cylinder 113, respectively, and the mounting plate 130 is slidably engaged with the guide rod 114. The movable clamp 140 is connected to the mounting plate 130. The fixed clamp 120 is used to clamp one end of the workpiece to be tested, and the movable clamp 140 is used to clamp the other end of the workpiece to be tested. The first stress cylinder 112 and the second stress cylinder 113 are used to provide the required stress to the workpiece to be tested.

[0024] Specifically, the base 110 is a basic supporting structure of the jig; the specific structures of the fixed clamp 120 and the movable clamp 140 will be described one by one below; the mounting plate 130 is a key component for realizing connection and transmission. Preferably, the mounting plate 130 is slidably fitted with the guide post through a linear bearing.

[0025] Specifically, the first stress cylinder 112 and the second stress cylinder 113 are driving components that provide tensile stress, which are intended to generate the stress required for testing. Preferably, they are gas-liquid增压 cylinders equipped with a precision pressure regulating valve and a pressure sensor, so as to control the output force more accurately. Preferably, the first stress cylinder 112 and the second stress cylinder 113 are arranged side by side symmetrically, so as to ensure that the tensile force acts on the center of the piece to be tested and prevent unbalanced loading.

[0026] Optionally, the guide rod 114 can be a smooth shaft, a linear guide rail or a square guide rail. There are usually at least four in number to balance the moment.

[0027] It should also be noted that the to-be-tested piece is usually a standard dumbbell-shaped test piece. And the jig is generally suitable for ductility testing of sheet materials such as aluminum foil and aluminum strip.

[0028] It can be understood that, by arranging two stress cylinders symmetrically and combining with the mounting plate 130 provided with the guide rod 114, the above technical solution constructs a stretching mechanism with sufficient rigidity and good centering performance. It has the advantage of being able to apply a stable and eccentricity-free axial tensile force to the to-be-tested piece, improving the accuracy and reliability of test results; at the same time, this structure highly integrates the tensile stress and the guiding system on one jig, making the whole device compact in structure, whose cost is much lower than that of a large universal testing machine, and the ductility stretching test can be realized through the simple actions of the first stress cylinder 112 and the second stress cylinder 113.

[0029] It should also be noted that, in one test method, the first stress cylinder 112 and the second stress cylinder can accurately set the output force of the cylinders, and the output forces can be in two groups, one group corresponds to the qualified yield strength threshold, and the other group corresponds to the qualified tensile strength threshold, so as to be used for judging the ductility of the test piece.

[0030] Further, the test piece is a sheet-shaped dumbbell-shaped standard sample, and it is necessary to mark the gauge length L0 on the test piece before the ductility test jig 100 clamps the test piece. After completing the gauge length marking, fix the test piece on the jig, start the first stress cylinder 112 and the second stress cylinder for pressure holding; after pressure holding, observe the length L1 after gauge length elongation through a magnifying glass. If (L1-L0) / L0 > the preset qualified elongation and the sample does not break, the test piece is qualified. Conversely, if the sample breaks during pressure holding or the elongation fails to meet the standard, it is unqualified.

[0031] Please refer to Figure 1 In a specific embodiment, the guide rod 114 is further provided with a limiting structure 115 and a protective structure 116; the limiting structure 115 is located below the mounting plate 130, and the protective structure 116 is located above the mounting plate 130.

[0032] Understandably, the limiting structure 115 is located below the mounting plate 130, and its main function is to limit the downward position of the mounting plate 130 when the cylinder retracts, preventing it from falling excessively and hitting the fixing clamp 120 or other components. The protective structure 116 is located above the mounting plate 130, and its core function is to set the upper limit position of the mounting plate 130 when the cylinder extends, preventing it from detaching from the guide rod 114 due to excessive stroke, thus providing overtravel protection.

[0033] Specifically, the limiting structure 115 and the protective structure 116 are both directly or indirectly mounted on the guide rod 114. Their connection to the guide rod 114 can be fixed, such as through interference fit, threaded connection, or welding, or it can be adjustable, such as by fixing the position with locking screws. When the mounting plate 130 slides on the guide rod 114, its movement trajectory is strictly limited between these two structures to provide a safe operating range.

[0034] In one specific embodiment, the limiting structure 115 is an elastic rubber ring, the purpose of which is to buffer impact and reduce noise.

[0035] Please continue reading. Figures 1 to 3 In one specific embodiment, the fixing clamp 120 includes a linear drive 121, a clamp base 122, and two opposing first jaws 123 and second jaws 124; The clamp seat 122 is fixedly mounted on the base 110. The clamp seat 122 forms a pair of spatially intersecting first and second inclined surfaces. One side of the first jaw 123 contacts the first inclined surface, and one side of the second jaw 124 contacts the second inclined surface. The linear drive member 121 is fixed relative to the clamp seat 122, and the drive end of the linear drive member 121 abuts against the first jaw 123 and the second jaw 124. Under the drive of the linear drive member 121, the first jaw 123 and the second jaw 124 can slide relative to the first inclined surface and the second inclined surface, respectively, so that the clamping surface of the first jaw 123 fits against the clamping surface of the second jaw 124.

[0036] Understandably, the fixed clamp 120 utilizes the inclined plane principle to efficiently convert the axial thrust provided by the linear drive 121 into a huge and synchronous opposing clamping force from the two jaws, ensuring clamping stability and centering, and effectively preventing the test piece from slipping or loosening during testing. At the same time, this mechanism has a self-locking characteristic (when the inclined plane angle is less than the friction angle), and can maintain the clamping state even in the event of an unexpected failure of the drive power, greatly improving the safety of the test. Furthermore, the entire clamping action is controlled by a single drive component, resulting in a compact structure and rapid response.

[0037] Optionally, the linear drive 121 is a cylinder drive or a hydraulic rod drive.

[0038] Furthermore, the clamping surface of the first gripper 123 is formed with a first spherical protrusion 1231, and the clamping surface of the second gripper 124 is formed with a first spherical groove 1241; when the clamping surface of the first gripper 123 and the clamping surface of the second gripper 124 are in contact, the first spherical protrusion 1231 can be accommodated in the first spherical groove 1241.

[0039] It is understandable that the first spherical convex hull 1231 is mainly designed to achieve stable clamping of the test piece and to avoid damage to the test piece that could affect the test results.

[0040] Please see Figures 1 to 3 In one specific embodiment, the movable clamp 140 includes a mounting base 141, a third clamping jaw 142, a fourth clamping jaw 143, and a screwing component 144; The mounting base 141 is fixed to the mounting plate 130, and the mounting plate 130 has a pin 1411. The third jaw 142 and the fourth jaw 143 are movably engaged with the pin 1411. The screwing member 144 passes through the third jaw 142 and is rotatably engaged with the fourth jaw 143. The screwing member 144 has an external thread, which engages with the third jaw 142. Rotating the screwing member 144 can make the clamping surfaces of the third jaw 142 and the fourth jaw 143 fit tightly together.

[0041] Understandably, the designer of the movable clamp 140 allows the operator to easily generate a large and adjustable clamping force through manual control, ensuring a firm grip on the workpiece under test. At the same time, this structure eliminates the need for a complex power source and control system, resulting in a simple, low-cost, and highly reliable overall design. Specifically, the movable clamp 140 further includes a return spring 145; the return spring 145 is sleeved on the screwing member 144 and abuts against the third jaw 142 and the fourth jaw 143. It can be understood that the return spring 145 is primarily provided to improve the reliability of the clamp's reset.

[0042] Furthermore, the third gripper 142 has two symmetrically arranged first connectors 1421; the fourth gripper 143 has a second connector 1431; The first connector 1421 and / or the second connector 1431 are movable relative to the pin 1411 in the direction of movement of the third gripper 142.

[0043] It is understood that the third gripper 142 is prone to generating axial torque during operation, and the first connecting member 1421 can overcome this torque. The first connecting member 1421 and / or the second connecting member 1431 can move relative to the pin 1411 in the moving direction of the third gripper 142, which can compensate for the alignment error of the movable clamp 140 and avoid interference between the third gripper 142 and the fourth gripper 143.

[0044] Optionally, the clamping surface of the third jaw 142 is formed with a second spherical protrusion (not shown), and the clamping surface of the fourth jaw 143 is formed with a second spherical groove; when the clamping surface of the third jaw 142 and the clamping surface of the fourth jaw 143 are in contact, the second spherical protrusion can be received in the second spherical groove. It can be understood that the second spherical protrusion is provided to improve the clamping force of the movable clamp 140.

[0045] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A ductility testing fixture, characterized in that, The device includes a base, a fixed clamp, a mounting plate, and a movable clamp. The base is fixedly connected to a first stress cylinder, a second stress cylinder, and a guide rod. The fixed clamp is mounted on the base. The mounting plate is connected to the drive ends of both the first and second stress cylinders, and the mounting plate is slidably engaged with the guide rod. The movable clamp is connected to the mounting plate. The fixed clamp is used to clamp one end of the workpiece under test, and the movable clamp is used to clamp the other end of the workpiece under test. The first and second stress cylinders provide the required stress to the workpiece under test.

2. The ductility testing fixture as described in claim 1, characterized in that, The guide rod is also provided with a limiting structure and a protective structure; the limiting structure is located below the mounting plate, and the protective structure is located above the mounting plate.

3. The ductility testing fixture as described in claim 2, characterized in that, The limiting structure is an elastic rubber ring.

4. The ductility testing fixture as described in any one of claims 1 to 3, characterized in that, The fixing fixture includes a linear drive, a fixture base, and two opposing first jaws and second jaws; The clamp seat is fixedly mounted on the base, and the clamp seat forms a pair of spatially intersecting first and second inclined surfaces; one side of the first jaw contacts the first inclined surface, and one side of the second jaw contacts the second inclined surface; the linear drive member is fixed relative to the clamp seat, and the driving end of the linear drive member abuts against the first jaw and the second jaw; under the drive of the linear drive member, the first jaw and the second jaw can slide relative to the first inclined surface and the second inclined surface respectively, so that the clamping surface of the first jaw fits against the clamping surface of the second jaw.

5. The ductility testing fixture as described in claim 4, characterized in that, The clamping surface of the first gripper has a first spherical protrusion, and the clamping surface of the second gripper has a first spherical groove; when the clamping surfaces of the first gripper and the second gripper are in contact, the first spherical protrusion can be accommodated in the first spherical groove.

6. The ductility testing fixture as described in claim 4, characterized in that, The movable clamp includes a mounting base, a third clamping jaw, a fourth clamping jaw, and a screwing component; The mounting base is fixed to the mounting plate, the mounting plate has a pin, the third jaw and the fourth jaw are movably engaged with the pin, the screwing component passes through the third jaw and is rotatably engaged with the fourth jaw, and the screwing component has an external thread, the external thread engages with the third jaw; rotating the screwing component can make the clamping surfaces of the third jaw and the fourth jaw fit tightly together.

7. The ductility testing fixture as described in claim 6, characterized in that, The movable clamp also includes a return spring; the return spring is sleeved on the screwing member and abuts against the third jaw and the fourth jaw.

8. The ductility testing fixture as described in claim 7, characterized in that, The third gripper has two symmetrically arranged first connecting members; the fourth gripper has a second connecting member; The first connector and / or the second connector are movable relative to the pin in the direction of movement of the third gripper.

9. The ductility testing fixture as described in claim 8, characterized in that, The clamping surface of the third jaw has a second spherical protrusion, and the clamping surface of the fourth jaw has a second spherical groove; when the clamping surface of the third jaw and the clamping surface of the fourth jaw are in contact, the second spherical protrusion can be accommodated in the second spherical groove.

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