Wire tensile test clamp and wire tensile test machine
By designing a wire tensile test fixture with a wire guard and multiple reference mounting positions, the data unreliability caused by insufficient clamping force and excessively large in the wire tensile test in the prior art is solved, and more accurate and reliable tensile test data is achieved.
Patent Information
- Application Number
- CN202510430292.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-08
- Publication Date
- 2025-06-27
AI Technical Summary
In the existing wire tensile test, insufficient clamping force leads to slipping of the sample, and excessive clamping force leads to local flattening or depression indentation, resulting in inaccurate fracture position and unreliable tensile test data obtained.
A wire tensile testing fixture is designed, including a clamping part and a connecting part. The clamping part is provided with a wire clamping position and a wire guard. The wire guard reduces the clamping force of the wire, and the clamping part locates the extension direction of the wire through a plurality of reference mounting positions and is parallel to the tensile axis of the tensile testing machine.
It effectively avoids slipping and partial flattening or depression indentation at the clamping end of the sample, and improves the reliability and accuracy of tensile test data.
Smart Images
Figure CN120213606A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of metal mechanical testing, and particularly to a wire tensile test fixture and a wire tensile testing machine. Background Art
[0002] The tensile specimens for the tensile test of metal materials include plates, bars and wires, among which the wires include wire rods and steel wires. For the tensile test of wire specimens, the fixture for clamping the specimen must use a large clamping force, otherwise the phenomenon of the specimen slipping in the clamping block will occur. When a large clamping force is used, the anti-slip pattern of the chuck will press into the clamping end of the wire specimen, resulting in local flattening or obvious indentation marks in the clamping part of the wire. There is no transition arc in the wire tensile specimen, nor is there a parallel section like a plate specimen or a standard round bar specimen. During the tensile test of the wire, most of the fracture positions are located at the clamping end of the specimen or the fixture jaws, which is the position where defects are generated when clamping the wire, especially prominent in the tensile test of small-sized wires. Whether the specimen slips during the tensile test or the specimen breaks inside the fixture, the obtained tensile test data is unreliable, making the test invalid. Summary of the Invention
[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related technologies.
[0004] To this end, in the first aspect of the present disclosure, a wire tensile test fixture is provided, which includes a clamping part and a connecting part. The connecting part is connected to the clamping part and is used to connect to the chuck of the tensile testing machine. Among them,
[0005] A wire clamping position is provided on the clamping part, and a wire installation position is provided on the connecting part. The accommodating spaces of the wire clamping position and the wire installation position are communicated. The wire clamping position has a plurality of reference installation positions, and the plurality of reference installation positions are used to limit the central axis of the wire extending direction to be parallel to the tensile axis of the tensile testing machine.
[0006] In a feasible implementation manner, a wire protection part is provided at the wire clamping position. The wire protection part is arranged at the connection between the wire clamping position and the wire installation position, and the wire protection part is used to reduce the clamping force on the wire.
[0007] In a feasible implementation manner, the clamping part includes a first clamping plate and a second clamping plate, and the wire clamping position is arranged between the first clamping plate and the second clamping plate. Among them,
[0008] The wire protection part is set as an arc edge and is arranged on the edge of the first clamping plate and / or the second clamping plate close to the wire clamping position.
[0009] In a feasible implementation, the first clamping plate and the second clamping plate are connected by an elastic member.
[0010] In a feasible implementation, one end of the clamping portion away from the connecting portion is provided as an arc.
[0011] In a feasible implementation, the clamping portion is bolted to the connecting portion.
[0012] In a feasible implementation, a plurality of bolt holes are provided on the connecting portion, and the plurality of bolt holes are symmetrically arranged on both sides of the entrance of the wire installation position. Among them,
[0013] The bolt hole is provided with an elongated hole, and the extending direction of the bolt hole is consistent with the clamping direction of the clamping portion.
[0014] In a feasible implementation, a positioning portion is further included. The positioning portion includes a positioning frame body and an adjusting member. The positioning frame body is movably connected to the connecting portion. The adjusting member is disposed on the positioning frame body, and the adjusting member is used to adjust the alignment degree between the central axis of the connecting portion and the stretching axis.
[0015] In a feasible implementation, the adjusting member is provided as a setscrew. The setscrew is screwed to the positioning frame body, and the setscrew abuts against the side wall of the connecting portion.
[0016] In a second aspect of the present disclosure, a wire stretching testing machine includes the above-mentioned wire stretching test fixture.
[0017] The above description is only an overview of the technical solutions provided by the present disclosure. In order to be able to understand the technical means of the present disclosure more clearly, it can be implemented according to the content of the description. And in order to make the above and other features and effects of the present disclosure more obvious and understandable, the following specific embodiments of the present disclosure are given. Brief Description of the Drawings
[0018] The drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with the present disclosure and used together with the description to explain the principles of the present disclosure.
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.
[0020] Upon reading the following detailed description of exemplary embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating exemplary embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:
[0021] Figure 1 One of the three-dimensional structural schematic diagrams of the present disclosure assembled on the positioning frame body;
[0022] Figure 2 Another three-dimensional structural schematic diagram of the present disclosure assembled on the positioning frame body;
[0023] Figure 3 Structural schematic diagram of the first clamping plate, the second clamping plate and the wire protection part of the present disclosure.
[0024] Among them, Figures 1 to 3 The corresponding relationship between the reference numerals and the component names in the figures is as follows: 1 - clamping part; 11 - wire clamping position; 12 - wire protection part; 13 - first clamping plate; 14 - second clamping plate; 2 - connecting part; 21 - wire installation position; 22 - bolt hole; 31 - positioning frame body. Detailed implementation manners
[0025] In order to more clearly understand the above-mentioned objects, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.
[0026] In the following description, many specific details are set forth in order to fully understand the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.
[0027] Currently, the tensile specimens for metal material tensile tests include plates, bars and wires, among which the wires include wire rods and steel wires. For the tensile test of wire specimens, the fixture for clamping the specimen must use a relatively large clamping force, otherwise the phenomenon of the specimen slipping in the clamping block will occur. When a relatively large clamping force is used, the anti-slip pattern of the chuck will be pressed into the clamping end of the wire specimen, resulting in local flattening or obvious indentation marks in the clamping part of the wire. The wire tensile specimen has no transition arc and no parallel section like the plate specimen or the standard round bar specimen. During the tensile test of the wire, most of the fracture positions are located at the clamping end of the specimen or the jaws of the fixture, which is the position where defects are generated when clamping the wire, especially prominent in the tensile test of small-sized wires. Whether the specimen slips during the tensile test or the specimen breaks inside the fixture, the obtained tensile test data are unreliable, making the test invalid.
[0028] Based on this, embodiments of the present disclosure provide a wire tensile test fixture, including a clamping portion and a connecting portion. The connecting portion is connected to the clamping portion and is used to connect to the chuck of a tensile testing machine. The clamping portion is provided with a wire clamping position, and the connecting portion is provided with a wire installation position. The accommodating spaces of the wire clamping position and the wire installation position are communicated. The wire clamping position has a plurality of reference installation positions, and the plurality of reference installation positions are used to position the central axis of the wire extension direction to be parallel to the tensile axis of the tensile testing machine. By implementing the technical solution of the present disclosure, the phenomenon of the specimen clamping end slipping in the chuck can be avoided, and local flattening or obvious indentation marks can be avoided from being generated on the clamping portion of the wire.
[0029] The wire tensile test fixture will be described in detail through specific embodiments as follows:
[0030] Refer to Figures 1 to 3 As shown, in a first aspect of the present disclosure, a wire tensile test fixture is provided, including a clamping portion 1 and a connecting portion 2. The connecting portion 2 is connected to the clamping portion 1 and is used to connect to the chuck of a tensile testing machine. The clamping portion 1 is provided with a wire clamping position 11, and the connecting portion 2 is provided with a wire installation position 21. The accommodating spaces of the wire clamping position 11 and the wire installation position 21 are communicated. The wire clamping position 11 has a plurality of reference installation positions, and the plurality of reference installation positions are used to position the central axis of the wire extension direction to be parallel to the tensile axis of the tensile testing machine.
[0031] The connecting portion 2 of the present disclosure is used to be inserted into the track groove of the crossbeam fixture of the tensile testing machine, as Figure 1 and 2Shown are two forms of upper and lower beam fixtures connected to the tensile testing machine, thereby forming a complete set of fixtures, in which the upper and lower parts are of the same structure, and the present disclosure is explained on one side. The clamping portion 1 of the present disclosure can be set as two independent plates with a wire clamping position 11 set between the two, or a through groove can be opened in the middle of a separate plate as the wire clamping position 11. It can be understood that the clamping portion 1 can have a certain degree of deformation when squeezed so as to clamp the wire, for example, the clamping portion 1 is set to a plastic material, specifically PEEK hard non-slip material. The connection method between the connecting portion 2 and the clamping portion 1 can be a fixed connection or a detachable connection. The present disclosure specifically selects a detachable connection method to facilitate the assembly of the equipment. The wire clamping position 11 disclosed in the present invention has multiple reference installation positions, such as the bottom of the through groove. When clamping the wire, the wire can be close to the bottom of the groove to achieve parallelism with the tensile axis. By adjusting the connection part, the wire is overlapped and aligned with the tensile circumference. For example, the reference installation position is set as multiple concave points or marking points set on the axis along the extension direction of the wire clamping position 11. The wire is parallel to the tensile axis through multiple reference installation positions, thereby improving the accuracy of the experimental data of the tensile test and avoiding the wire groove being broken due to the cheap tensile axis. It should be noted that the wire installation position 21 on the connection part 2 disclosed in the present invention is not squeezed and will not be deformed. It is intended to give way and guide the wire.
[0032] In some embodiments, the wire clamping position 11 is provided with a wire protection portion 12, and the wire protection portion 12 is provided at the connection between the wire clamping position 11 and the wire installation position 21, and the wire protection portion 12 is used to reduce the clamping force of the wire.
[0033] In this embodiment, if Figure 3 As shown, the wire clamping position 11 is provided with a wire guard 12, and the wire guard 12 is provided at the connection between the wire clamping position 11 and the wire installation position 21, so that when pressure is applied to clamp, the point contact (line contact) of the clamp on the wire is converted into surface contact, and the pressure on the edges will not cause local flattening or obvious concave indentations in the clamping part of the wire, thereby causing breakage. Specifically, the wire guard 12 can be set to a flexible material to contact the wire to disperse or reduce the pressure of the part, and a chamfer or other structure can also be set to avoid the edges of the connection, and the chamfer radius is set to 0.2mm to 1mm to avoid the indentation without affecting the clamping.
[0034] In some embodiments, the clamping portion 1 includes a first clamping plate 13 and a second clamping plate 14, and the wire clamping position 11 is arranged between the first clamping plate 13 and the second clamping plate 14, wherein the wire protecting portion 12 is arranged as an arc edge, and the wire protecting portion 12 is arranged on the edge of the first clamping plate 13 and / or the second clamping plate 14 close to the wire clamping position 11.
[0035] In this embodiment, the clamping part 1 includes a first clamping plate 13 and a second clamping plate 14. The wire clamping position 11 is arranged between the first clamping plate 13 and the second clamping plate 14. Among them, the wire protection part 12 is arranged as an arc edge to reduce the setting structure, and the arc edge is not likely to produce indentations and depressions.
[0036] In some embodiments, the first clamping plate 13 and the second clamping plate 14 are connected by an elastic member.
[0037] In this embodiment, the first clamping plate 13 and the second clamping plate 14 are connected by an elastic member for easy overall installation and positioning, and the elastic member has a deformation ability that does not affect the application of the clamping force.
[0038] In some embodiments, the end of the clamping part 1 far from the connecting part 2 is arranged as an arc.
[0039] In this embodiment, the end of the clamping part 1 far from the connecting part 2 is arranged as an arc. This arc part is set as the top of the clamping part 1. Being arranged as an arc can better fit with the clamping position of the tensile testing machine.
[0040] In some embodiments, the clamping part 1 and the connecting part 2 are bolted. Further, a plurality of bolt holes 22 are arranged on the connecting part 2, and the plurality of bolt holes 22 are symmetrically arranged on both sides of the entrance of the wire installation position 21. Among them, the bolt holes 22 are arranged as long strip holes, and the extending direction of the bolt holes 22 is consistent with the clamping direction of the clamping part 1.
[0041] The clamping part 1 and the connecting part 2 are connected together by screws. The clamping part 1 is perpendicular to the connecting part 2, and the connecting part is arranged as a plate-like mechanism. The bolt can move freely in the bolt hole 22 of the connecting part 2. The clamping part 1 connected by the bolt can freely adjust its gap to adapt to tensile specimens of different specifications, and the clamping part 1 can also have a certain degree of mobility when applying the clamping force.
[0042] In some embodiments, a positioning part is further included. The positioning part includes a positioning frame body 31 and an adjusting member. The positioning frame body 31 is movably connected to the connecting part 2, and the adjusting member is arranged on the positioning frame body 31, and the adjusting member is used to adjust the alignment degree between the central axis of the connecting part 2 and the tensile axis.
[0043] In this embodiment, the present disclosure is further provided with a positioning portion. The positioning frame body 31 is arranged on a tensile testing machine during use, and the connecting portion 2 is movably connected to the positioning frame body 31. Since the tensile axes of different tensile testing machines are different, the centering degree between the central axis of the connecting portion 2 and the tensile axis can be achieved through the positioning of the adjusting member. For example, when the connecting portion 2 slides to the outermost end of the chute of tensile testing machine A, the central axis of the connecting portion 2 is 5 mm away from the tensile axis. Then, by using the adjusting member to occupy 5 mm of the chute of tensile testing machine A, the central axis of the connecting portion 2 can be aligned with the tensile axis. Then, when the wire is installed, the reference installation position of the wire clamping position 11 and the central axis of the wire installation position 21 on the connecting portion 2 are on the same axis, so that the wire can be directly aligned with the tensile axis. It can be understood that when tensile testing machine B has other dimensions, the occupancy of the adjusting member can be adjusted. Further, the adjusting member is set as a set screw, and the set screw is screwed to the positioning frame body 31 and abuts against the side wall of the connecting portion 2 for easy adjustment.
[0044] When specifically using the present disclosure, the clamping portion 1 and the connecting portion 2 are connected together by screws. The clamping block is perpendicular to the slider, and the connecting portions 2 of the upper and lower clamps are completely inserted into the track grooves of the upper and lower crossbeam clamps of the tensile testing machine. Take a wire tensile specimen, insert the upper and lower clamping portions of the tensile specimen into the wire clamping position 11 and the wire installation position 21, and arrange them by aligning with the reference installation position. Clamp the clamping block through the chuck of the tensile testing machine, and start the tensile testing machine to conduct a tensile test.
[0045] In the second aspect of the present disclosure, a wire tensile testing machine is provided, including the above-mentioned wire tensile test fixture.
[0046] In the present disclosure, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "plural" refers to two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.
[0047] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present disclosure.
[0048] In the description of this specification, the descriptions of the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0049] The above are only the preferred embodiments of the present disclosure and are not used to limit the present disclosure. For those skilled in the art, the present disclosure may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.
Claims
1. A wire tensile test fixture, characterized in that: It comprises a clamping part and a connecting part, wherein the connecting part is connected to the clamping part, and the connecting part is used to connect to the chuck of a tensile testing machine, wherein: The clamping portion is provided with a wire clamping position, and the connecting portion is provided with a wire installation position. The wire clamping position is connected to the accommodating space of the wire installation position. The wire clamping position has a plurality of reference installation positions, and the plurality of reference installation positions are used to limit the central axis of the wire extension direction to be parallel to the tensile axis of the tensile testing machine.
2. The wire tensile test fixture according to claim 1, characterized in that: The wire clamping position is provided with a wire protection portion, and the wire protection portion is provided at the connection between the wire clamping position and the wire installation position, and the wire protection portion is used to reduce the clamping force of the wire.
3. The wire tensile test fixture according to claim 2, characterized in that: The clamping portion includes a first clamping plate and a second clamping plate, and the wire clamping position is arranged between the first clamping plate and the second clamping plate, wherein: The wire protection portion is configured as an arc-shaped edge, and the wire protection portion is disposed on an edge of the first clamping plate and / or the second clamping plate close to the wire clamping position.
4. The wire tensile test fixture according to claim 3, characterized in that: The first clamping plate and the second clamping plate are connected by an elastic member.
5. The wire tensile test fixture according to claim 1, characterized in that: One end of the clamping portion away from the connecting portion is configured in an arc shape.
6. The wire tensile test fixture according to claim 1, characterized in that: The clamping portion is connected to the connecting portion by bolts.
7. The wire rod tensile test fixture according to claim 1, characterized in that: The connecting portion is provided with a plurality of bolt holes, and the plurality of bolt holes are symmetrically arranged on both sides of the wire installation position entrance, wherein: The bolt hole is provided with a long strip hole, and the extending direction of the bolt hole is consistent with the clamping direction of the clamping part.
8. The wire tensile test fixture according to claim 1, characterized in that: It also includes a positioning part, which includes a positioning frame body and an adjusting member. The positioning frame body is movably connected to the connecting part. The adjusting member is arranged on the positioning frame body, and the adjusting member is used to adjust the alignment between the central axis of the connecting part and the stretching axis.
9. The wire tensile test fixture according to claim 1, characterized in that: The adjusting member is configured as a top screw, the top screw is threadedly connected to the positioning frame body, and the top screw abuts against the side wall of the connecting portion.
10. A wire tensile testing machine, characterized in that: A wire tensile test fixture comprising the wire tensile test fixture as described in any one of claims 1 to 9.