Device for performing flaring test on tubular rivet

Abstract

The utility model belongs to the field of aviation high-end rivets, and provides a device for performing a flaring test on a tubular rivet, which comprises an upper riveting die, a lower riveting die, a riveting die sleeve and a cutting board, the cutting board is provided with a centering piece with a C-shaped structure, the riveting die sleeve is nested with the upper riveting die, and the top of the riveting die sleeve is provided with a magnet. According to the utility model, the upper riveting die can be quickly assembled, detached and replaced by adopting the magnet, and the centering piece is used as an outer protection piece of the lower riveting die and can play a role in limiting at the end of loading, so that excessive loading is prevented; the centering part also provides centering conditions for the upper riveting die and the lower riveting die, so that the concentricity of flaring operation is ensured, and the flaring forming quality is improved; the centering piece is of a C-shaped structure, the flaring process can be visualized, the operation accuracy of a flaring experiment is conveniently controlled, design is reasonable, the structure is simple, operation is convenient, the loading process is visualized, flaring forming quality can be improved, and the flaring device is suitable for large-scale popularization.

Description

Technical Field

[0001] The utility model belongs to the field of aviation high-end rivets, and in particular relates to a device for performing an expansion test on a tubular rivet. Background Art

[0002] In the field of aerospace, titanium-niobium tubular rivets are high-end rivets, and aircraft manufacturers need a large number of titanium-niobium tubular rivets. Generally, titanium-niobium tubular rivets include the general features of tubular rivets, such as a rivet for electronic connectors or plug-in power supply components disclosed in the existing patent CN201368100Y, which includes a head, a body and a tubular groove.

[0003] At present, since aviation tubular rivets are made of titanium-niobium materials, titanium-niobium tubular rivets are a kind of high-end rivets. In order to detect their installation performance, a simulated expansion test is required. CN203862929U discloses a tooling for processing tubular rivets and hollow rivets, including an upper die positioning column, a forming upper die core, a fixing screw, a forming lower die core, a die core fixing plate, a length positioning rod, a lower die top block, a spring, a bottom plate, and an inner hexagon screw. The forming upper die core is fixed to the upper die positioning column by a fixing screw to form an upper die as a whole, and the upper die as a whole is fixed to the machine tool; the forming lower die core is arranged on the die core fixing plate, the length positioning rod is arranged in the forming lower die core, the spring is arranged in the bottom plate, and the lower die top block is arranged on the spring in the bottom plate; the die core fixing plate and the bottom plate are locked by inner hexagon screws to form an overall lower die. The device can complete the preparation of tubular rivet expansion specimens, but the problem is that since the tops of some tubular rivets are higher than the lower mold core, there will be excessive loading force during the riveting process, which will affect the expansion quality; furthermore, when the specimen is loaded and riveted, its expansion process is in a closed field of vision, which is not conducive to controlling its expansion molding quality. Utility Model Content

[0004] In view of the technical problems existing in the above-mentioned expanding device, the utility model proposes a device for expanding test of tubular rivets, which has reasonable design, simple structure, convenient operation, visualized loading process and is beneficial to improving the quality of expanding forming.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is that the utility model provides a device for performing an expansion test on a tubular rivet, comprising an upper rivet die and a lower rivet die, a rivet die sleeve is arranged on the top of the upper rivet die, an anvil is arranged on the bottom of the lower rivet die, a centering piece of a C-shaped structure is arranged on the anvil, the center of the centering piece is a superior arc hole, the centering piece is located outside the lower rivet die and its thickness is greater than the thickness of the lower rivet die, the rivet die sleeve is nested with the upper rivet die and an installation opening is arranged on the top, a magnet is arranged in the installation opening, the bottom surface of the magnet is connected to the top surface of the upper rivet die, and the top surface of the magnet is used to connect with the loading connector of the loading device.

[0006] Preferably, the bottom of the centering piece is provided with a limiting opening that cooperates with the side surface and top surface of the lower riveting die.

[0007] Preferably, the lower riveting die is an O-shaped structure.

[0008] Preferably, the upper riveting die is a T-shaped structure and the diameter of its head end is larger than the diameter of the lower riveting die, and the head end of the upper riveting die is used to cooperate with the top of the centering piece.

[0009] Preferably, the bottom of the upper riveting die is provided with multiple conical surfaces.

[0010] Preferably, the thickness of the centering piece is 3 to 8 times the thickness of the lower riveting die.

[0011] Compared with the prior art, the advantages and positive effects of the utility model are:

[0012] 1. The utility model provides a device for expanding a tubular rivet. The upper riveting die can be quickly assembled and replaced by using a magnet, and the centering piece as the outer protective piece of the lower riveting die can play a limiting role at the end of loading to prevent overloading; the centering piece also provides centering conditions for the upper riveting die and the lower riveting die, which is conducive to ensuring the concentricity of the expanding operation and improving the quality of the expanding molding; the centering piece adopts a C-shaped structure to visualize the process of expanding, which is convenient for controlling the accuracy of the expansion experiment. The device has a reasonable design, a simple structure, convenient operation, a visualized loading process, and is conducive to improving the quality of the expanding molding, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 is an axonometric view of a device for conducting an expansion test on a tubular rivet;

[0015] Figure 2 is a cross-sectional view of a device for conducting an expansion test on a tubular rivet;

[0016] Figure 3 It is a front view of a device for carrying out expansion test on tubular rivets (without loading connector);

[0017] In the above figures, 1. upper riveting die; 11. multi-segment cone; 2. lower riveting die; 3. riveting die sleeve; 31. mounting opening; 4. anvil; 5. centering piece; 51. superior arc hole; 52. limit opening; 6. magnet; 7. loading connector; 8. tubular rivet specimen. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0020] Examples, such as Figure 1 , Figure 2 and Figure 3 As shown, the utility model provides a device for performing an expansion test on a tubular rivet, comprising an upper rivet die 1 and a lower rivet die 2, a rivet die sleeve 3 is provided on the top of the upper rivet die 1, and the rivet die sleeve 3 is used to position the upper rivet die 1, and an anvil 4 is provided at the bottom of the lower rivet die 2, and the anvil 4 is a bottom support. Before performing the expansion test operation, the head of the tubular rivet can be cut off, and the rivet body can be retained as the expansion test piece, so that the error of the expansion test can be reduced. Further, the utility model is provided with a C-shaped centering piece 5 on the anvil 4, the center of the centering piece 5 is a superior arc hole 51, the centering piece 5 is located outside the lower rivet die 2 and its thickness is greater than the thickness of the lower rivet die 2, the rivet die sleeve 3 is nested with the upper rivet die 1 and a mounting port 31 is provided on its top, a magnet 6 is provided in the mounting port 31, the bottom surface of the magnet 6 is connected to the top surface of the upper rivet die 1, and the top surface of the magnet 6 is used to connect with the loading connector 7 of the loading device.

[0021] In the present device, the upper riveting die 1 can be quickly assembled and disassembled by using the magnet 6, and the centering piece 5 as the outer protective piece of the lower riveting die 2 can play a limiting role at the end of loading to prevent excessive loading; the centering piece 5 also provides centering conditions for the upper riveting die 1 and the lower riveting die 2, which is beneficial to ensure the concentricity of the expanding operation and improve the quality of expanding molding; the centering piece 5 adopts a C-type structure, and on the basis of limiting the lower riveting die 2, the process of expanding can be visualized, which is convenient for controlling the operation accuracy of the expanding experiment.

[0022] In order to improve the coaxiality between the lower riveting die 2 and the centering piece 5, the utility model is provided with a limiting opening 52 at the bottom of the centering piece 5, which cooperates with the side and top surfaces of the lower riveting die 2. The limiting opening 52 has a height limiting effect on the lower riveting die 2. The inner wall of the limiting opening 52 limits the radial movement of the lower riveting die 2, so that it maintains a high stability inside the centering piece 5. In addition, the center of the centering piece 5 is a superior arc hole 51, which can establish an effective interaction force node with the lower riveting die 2, thereby preventing the lower riveting die 2 from escaping from the center of the centering piece 5 under extrusion conditions.

[0023] In order to improve the practicality of the lower rivet die 2, the lower rivet die 2 provided by the utility model is an O-shaped structure, and the inside of the O-shaped hole is used to place the tubular rivet specimen. In order to improve the compatibility with the tubular rivet specimen 8, a certain proportion of shrinkage can be set at the bottom end of the O-shaped hole, and the shrinkage can play a centering role for the tubular rivet specimen 8.

[0024] In order to improve the matching performance between the upper riveting die 1 and the centering piece 5, the upper riveting die 1 provided by the utility model is a T-shaped structure and the diameter of its head end is larger than the diameter of the lower riveting die 2. The head end of the upper riveting die 1 is used to match with the top of the centering piece 5, and the vertical part of the upper riveting die 1 is movably interlaced with the superior arc hole 51 of the centering piece 5. In this way, the upper riveting die 1 and the centering piece 5 can establish an effective matching relationship during the expansion loading process, which ensures the centering effect while also obtaining a better limiting effect.

[0025] In order to improve the quality of expansion forming, the utility model is provided with a plurality of conical surfaces 11 at the bottom of the upper riveting die 1, and the diameter of the plurality of conical surfaces 11 decreases from top to bottom. In the process of pressure contact between the plurality of conical surfaces 11 and the tail groove of the tubular rivet specimen 8, a large span of stress change will not be generated, that is, no sudden stress change will occur, thereby ensuring the integrity of the expansion.

[0026] In order to ensure the practicality of the centering piece, the thickness of the centering piece provided by the utility model is 3 to 8 times the thickness of the lower riveting die, so that the riveting end point of the upper riveting die can maintain a good safety distance from the lower riveting die and the workpiece, thereby ensuring the completion efficiency of the expansion experiment.

[0027] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A device for performing an expansion test on a tubular rivet, comprising an upper riveting die and a lower riveting die, wherein a riveting die sleeve is arranged at the top of the upper riveting die, and an anvil is arranged at the bottom of the lower riveting die, characterized in that: A C-shaped centering piece is provided on the anvil plate, the center of the centering piece is a major arc hole, the centering piece is located outside the lower riveting die and its thickness is greater than the thickness of the lower riveting die, the riveting die sleeve is nested with the upper riveting die and a mounting opening is provided on the top, a magnet is provided in the mounting opening, the bottom surface of the magnet is connected to the top surface of the upper riveting die, and the top surface of the magnet is used to connect with the loading connector of the loading device.

2. A device for performing expansion test on tubular rivets according to claim 1, characterized in that: The bottom of the centering piece is provided with a limiting opening which matches with the side surface and the top surface of the lower riveting die.

3. A device for performing expansion test on tubular rivets according to claim 2, characterized in that: The lower riveting die is an O-shaped structure.

4. A device for performing expansion test on tubular rivets according to claim 3, characterized in that: The upper riveting die is a T-shaped structure and the diameter of its head end is larger than the diameter of the lower riveting die. The head end of the upper riveting die is used to cooperate with the top of the centering piece.

5. A device for performing expansion test on tubular rivets according to claim 4, characterized in that: The bottom of the upper riveting die is provided with multiple conical surfaces.

6. A device for performing expansion test on tubular rivets according to any one of claims 1 to 5, characterized in that: The thickness of the centering piece is 3 to 8 times the thickness of the lower riveting die.

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