Core print for aluminum alloy tensile pipe sample
By designing a conical core head for aluminum alloy tensile pipe, the problems of clamping instability and core head fracture in the tensile test of hard alloy pipes are solved, and the effect of reducing the fracture rate and sample cost is achieved.
Patent Information
- Application Number
- CN202420517647.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-03-15
AI Technical Summary
When conducting performance testing of aluminum alloy tensile pipes, the clamping part of the hard alloy pipes is high and difficult to flatten, resulting in easy core head fracture in tensile tests, which increases the detection cost.
A core head for aluminum alloy stretched pipe specimens is designed, and the conical meter structure is adopted. By plugging the core head at both ends of the pipe specimen, the clamping stability is improved, and the conical meter structure is avoided during the deformation of the pipe, reducing the impact on the extrusion on the pipe.
It effectively reduces the cut-off ratio of aluminum alloy tensile pipe specimens, improves the clamping stability of tensile tests, and reduces the cost of the specimen.
Smart Images
Figure CN222545110U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sample tensile testing, in particular to a core head used for aluminum alloy tensile pipe sample. Background Art
[0002] Aluminum alloy thin-walled pipes are an important material for making transportation pipelines. During the production process of aluminum alloy thin-walled pipes, the mechanical properties testing of the pipes is an indispensable and crucial link. The test data is an important basis for judging whether the mechanical properties of the pipes meet the product technical standards.
[0003] When conducting whole-drawn pipe performance testing, the clamping part can be flattened to facilitate clamping. However, this method is only applicable to soft alloy pipes with low strength, such as pure aluminum and rust-proof aluminum. When conducting whole-drawn pipe performance testing on hard alloy pipes, the hard alloy pipes do not have the conditions to flatten the clamping part because their clamping parts are high in strength and easy to be crushed. Therefore, core heads of appropriate sizes need to be inserted at both ends of the sample to facilitate clamping.
[0004] The currently used stretching core head structure is usually a straight core head. However, during the stretching deformation process of the straight core head, as the deformation continues, the tube will shrink in the radial direction, and the end face of the straight core head close to the deformation zone will limit the deformation process. Therefore, it is easy to break at the position where the core head end face contacts the tube, resulting in the problem of the end head. Utility Model Content
[0005] The utility model aims to provide a core head for aluminum alloy tensile pipe sample, which can effectively reduce the breakage rate of the aluminum alloy tensile pipe sample, thereby reducing the detection cost.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] A core head for an aluminum alloy tensile pipe sample comprises a core head body, the core head body being a truncated cone structure and being used to be inserted into the interior of the clamping ends at both ends of the pipe sample, the small ends of the two core head bodies inserted into the two ends of the pipe sample corresponding to each other.
[0008] In some embodiments, the difference between the diameter of the large end of the core head body and the diameter of the small end of the core head body is 0.5 mm.
[0009] In some embodiments, a connecting hole is provided at the large end of the core head body, the connecting hole extends axially along the core head body, the connecting hole is used to install a connecting piece, and an end of the connecting piece away from the core head body is used to connect to the chuck of a tensile testing machine.
[0010] In some embodiments, the connecting hole is a threaded hole, the connecting member is a threaded rod, and the threaded rod is used to be connected in the threaded hole.
[0011] In some embodiments, the end surface of the small end of the core head body transitions to a conical arc.
[0012] In some embodiments, a ball head is provided at the small end of the core head body, and a diameter of the ball head is the same as a diameter of the small end of the core head body.
[0013] In some embodiments, the large end of the core head body is provided with a cylindrical section, and the diameter of the cylindrical section is the same as the diameter of the large end of the core head body.
[0014] In some embodiments, the cylindrical section transitions to a large end arc of the core head body.
[0015] In some embodiments, the diameter of the cylindrical section is the same as the inner diameter of the tubing specimen.
[0016] In some embodiments, the core head body includes a plurality of detachably connected frustum cones.
[0017] Compared with the prior art, the above technical solution has the following advantages:
[0018] The utility model provides a core head for aluminum alloy tensile pipe sample. When performing a tensile test, the tensile machine clamps the clamping ends at both ends of the pipe sample. Since the core head body is plugged into the clamping ends, the pipe sample can be supported to improve the clamping stability of the tensile machine on the pipe sample. In addition, since the core head body is a truncated cone structure, during the deformation of the pipe sample, the core head body will avoid the radially contracted pipe sample to reduce the squeezing effect of the small end of the core head body on the pipe sample, thereby reducing the probability of the pipe sample having an end during the stretching process, thereby reducing the sample cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0020] Figure 1 A schematic structural diagram of a core head for an aluminum alloy tensile pipe specimen provided by a specific embodiment of the utility model;
[0021] Figure 2 It is a schematic diagram of the structure when the threaded rod is connected to the core head;
[0022] Figure 3 Schematic diagram of the structure of the core head inserted into the pipe sample.
[0023] The reference numerals are as follows:
[0024] 10 is the core body, 11 is the small end, 12 is the large end, and 13 is the connecting hole;
[0025] 20 is a threaded rod;
[0026] 30 is the pipe sample. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] Please refer to Figure 1 to Figure 3 The embodiment of the utility model provides a core head for aluminum alloy tensile pipe sample, including: a core head body 10, the core head body 10 is a truncated cone structure, that is, one end of the core head body 10 is a small end 11, and the other end is a large end 12, wherein the taper of the core head body 10 can be selected according to the actual test needs. When conducting the test, the core head body 10 is inserted into the inside of the clamping ends at both ends of the pipe sample 30, and the small ends 11 of the two core head bodies 10 inserted at both ends of the pipe sample 30 correspond to each other, that is, the large end 12 of the core head body 10 faces the outside of the pipe sample 30, as shown in the figure. Figure 3 As shown. When performing a tensile test, the stretching machine clamps the clamping ends at both ends of the pipe sample 30. Since the core head body 10 is inserted in the clamping ends, the pipe sample 30 can be supported to improve the clamping stability of the stretching machine on the pipe sample 30. In addition, since the core head body 10 is a truncated cone structure, during the deformation of the pipe sample 30, the core head body 10 will avoid the radially contracted pipe sample 30 to reduce the squeezing effect of the small end 11 of the core head body 10 on the pipe sample 30, so the probability of the pipe sample 30 having an end during the stretching process can be reduced, thereby reducing the sample cost.
[0029] In some embodiments, the difference in diameter between the large end 12 of the core head body 10 and the small end 11 of the core head body 10 is preferably 0.5 mm, that is, the diameter of the large end 12 of the core head body 10 is 0.5 mm larger than the diameter of the small end 11 of the core head body 10. In addition, the difference in diameter between the large end 12 and the small end 11 may also be greater than or less than 0.5 mm, as long as the core head body 10 is a frustum of cones.
[0030] In some embodiments, the large end 12 of the core head body 10 is provided with a connection hole 13, and the connection hole 13 extends along the axial direction of the core head body 10. After the tensile test of the pipe sample 30 is completed, the connector can be installed in the connection hole 13, and the end of the connector away from the core head body 10 is connected to the chuck of the tensile tester. By pulling the connector by the tensile tester, the core head body 10 can be taken out of the pipe sample 30, so as to facilitate the repeated use of the core head body 10. Among them, the connection hole 13 is a threaded hole, and the connection piece is a threaded rod 20, which can be connected to the threaded hole. In addition, the connection piece can also be a pull rod, and the connection hole 13 is a clamping hole, and one end of the pull rod can be clamped in the clamping hole.
[0031] In some embodiments, the end surface of the small end 11 of the core head body 10 transitions to the conical surface in an arc, which can further reduce the influence of the small end 11 of the core head body 10 on the pipe sample 30 during the tensile shrinkage deformation. In addition, by designing the small end 11 of the core head body 10 to be an arc transition, it is possible to prevent the small end 11 of the core head body 10 from scratching the inner wall of the pipe sample 30, thereby ensuring the tensile sample quality of the pipe sample 30.
[0032] In some embodiments, a ball head is provided at the small end 11 of the core head body 10, and the diameter of the ball head is the same as the diameter of the small end 11 of the core head body 10. For example, a hemispherical ball head can be provided at the small end 11 of the core head body 10. The ball head can further reduce the influence of the small end 11 of the core head body 10 on the pipe sample 30 during the tensile shrinkage deformation.
[0033] In some embodiments, the large end 12 of the core head body 10 is provided with a cylindrical section, and the diameter of the cylindrical section is the same as the diameter of the large end 12 of the core head body 10. Before the tensile test, the cylindrical section of the core head body 10 can be inserted into the pipe sample 30 together, and the contact area of the core head body 10 with the pipe sample 30 can be effectively increased through the cylindrical section, thereby improving the support stability of the core head body 10 on the pipe sample 30. Among them, the cylindrical section and the large end 12 of the core head body 10 are in an arc transition. The diameter of the cylindrical section is the same as the inner diameter of the pipe sample 30, so as to improve the support stability of the core head body 10 on the pipe sample 30, thereby ensuring the clamping stability of the tensile machine on the pipe sample 30.
[0034] In some embodiments, the core head body 10 includes multiple sections of detachably connected frustums, and the diameter of the small end 11 of the larger frustum of two adjacent sections of the frustum is equal to the diameter of the large end 12 of the smaller frustum. When it is necessary to perform a tensile test on pipe samples 30 with different inner diameters, frustums of corresponding diameters can be selected for docking to match the corresponding pipe samples 30, thereby effectively improving the adaptability of the core head body 10 to the pipe samples 30.
[0035] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0036] The above is a detailed introduction to a core head for aluminum alloy tensile pipe specimens provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.
Claims
1. A core head for aluminum alloy tensile pipe specimen, characterized in that: include: The core head body is a truncated cone structure and is used to be inserted into the interior of the clamping ends at both ends of the pipe sample. The small ends of the two core head bodies inserted at the two ends of the pipe sample correspond to each other.
2. The core head for aluminum alloy tensile pipe specimen according to claim 1, characterized in that: The difference between the diameter of the large end of the core head body and the diameter of the small end of the core head body is 0.5 mm.
3. The core head for aluminum alloy tensile pipe specimen according to claim 1, characterized in that: The large end of the core head body is provided with a connecting hole, which extends along the axial direction of the core head body. The connecting hole is used to install a connecting piece, and one end of the connecting piece away from the core head body is used to connect with the chuck of the tensile testing machine.
4. The core head for aluminum alloy tensile pipe specimen according to claim 3, characterized in that: The connecting hole is a threaded hole, the connecting piece is a threaded rod, and the threaded rod is used to be connected in the threaded hole.
5. The core head for aluminum alloy tensile pipe specimen according to claim 1, characterized in that: The end surface of the small end of the core head body transitions to the conical arc.
6. The core head for aluminum alloy tensile pipe specimen according to claim 1, characterized in that: The small end of the core head body is provided with a ball head, and the diameter of the ball head is the same as the diameter of the small end of the core head body.
7. The core head for aluminum alloy tensile pipe specimen according to claim 1, characterized in that: The large end of the core head body is provided with a cylindrical section, and the diameter of the cylindrical section is the same as the diameter of the large end of the core head body.
8. The core head for aluminum alloy tensile pipe specimen according to claim 7, characterized in that: The cylindrical section transitions to the large end arc of the core head body.
9. The core head for aluminum alloy tensile pipe specimen according to claim 8, characterized in that: The diameter of the cylindrical section is the same as the inner diameter of the pipe sample.
10. The core head for aluminum alloy tensile pipe specimen according to claim 1, characterized in that: The core head body comprises a plurality of detachably connected frustums.