Pipe fitting for magnetic pulse crimping process
By setting an annular groove and an inner support member on the outer wall of the tube body, combined with the buffer layer to absorb impact energy, the problem of unstable connection between the inner and outer pipe fittings in the magnetic pulse crimping is solved, and an efficient and reliable connection effect is achieved.
Patent Information
- Application Number
- CN202510752735.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2025-08-22
AI Technical Summary
In the magnetic pulse crimping process, the instantaneous deformation of the outer pipe fittings produces a large impact force on the inner pipe fittings, affecting the connection reliability of the inner and outer pipe fittings.
The ring groove is provided on the outer wall of the tube body, and a support member and a buffer layer are provided on the inner side. The support member is fixed by the support ring and limit structure. The buffer layer uses low-strength materials to absorb impact energy to ensure the reliability of the connection between the inner and outer pipe fittings.
Through the design of support and buffer layer, the deformation and damage of inner pipe fittings can be effectively reduced, the connection reliability is improved, and the impact of processing costs and weight is reduced.
Smart Images
Figure CN120521069A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of automobile parts processing technology, and in particular to a pipe fitting used in a magnetic pulse crimping process. Background Art
[0002] Lightweight design, focusing on multiple aspects of materials, structure, and process, can significantly reduce the overall weight of a vehicle. Considering the specific strength and stiffness requirements of different structures, different material combinations are used, which raises the issue of connecting dissimilar pipes. Traditional welding can easily produce brittle phases or poor fusion, making it difficult to achieve a stable connection.
[0003] As an emerging connection technology, magnetic pulse crimping technology uses the instantaneous impact force generated by electromagnetic induction to deform the outer pipe inward to form a reliable connection with the inner pipe. It can achieve reliable connection of dissimilar materials such as metal and metal, metal and non-metal, etc. It has the advantages of high efficiency, environmental protection, small material damage, controllable deformation, high precision, etc.
[0004] During actual processing, the instantaneous deformation of the outer pipe will generate a large impact force on the inner pipe, which may cause the inner pipe to deform and affect the connection reliability of the inner and outer pipes. Summary of the Invention
[0005] Based on the above description, the present invention provides a pipe fitting for magnetic pulse crimping process to solve the problem in related technology that the instantaneous deformation of the outer pipe fitting will produce a large impact force on the inner pipe fitting, which may cause the inner pipe fitting to deform and affect the connection reliability of the inner and outer pipe fittings.
[0006] The technical solution of the present invention to solve the above technical problems is as follows: This application provides a pipe fitting for magnetic pulse crimping process, and the technical solution adopted is as follows: A pipe fitting for a magnetic pulse crimping process, comprising: A tube body, wherein an annular groove is formed on the outer wall of the tube body around its own axis; A support member is provided in the tube body and located inside the annular groove, and the support member is used to limit the inward deformation of the tube body at the annular groove.
[0007] Preferably, the support member includes a support ring coaxial with the tube body, the outer diameter of the support ring is the same as the inner diameter of the tube body, and the axial length of the tube body is greater than the axial width of the annular groove.
[0008] Preferably, an annular reinforcing rib coaxial with the support ring is provided on the inner wall of the support ring.
[0009] Preferably, the support member also includes a limiting structure connected to the support ring, and the limiting structure is used to limit the support ring from continuing to move into the tube body when the support ring is inserted into the tube body from one end of the tube body and moves to the inner side of the ring groove.
[0010] Preferably, the limiting structure includes a limiting rod, which extends axially along the support ring and is connected to the support ring at one end, and the other end of the limiting rod is connected to a limiting block. On a plane perpendicular to the axis of the support ring, the projected part of the limiting block is located outside the outer circle of the projection of the support ring.
[0011] Preferably, a buffer layer is provided on the inner wall of the annular groove, the material strength of the buffer layer is lower than the material strength of the pipe, and the buffer layer is suitable for being squeezed and deformed by the outer pipe when the outer pipe is deformed and filled into the annular groove.
[0012] Preferably, the buffer layer is provided with an annular deformation groove surrounding the axis of the tube body.
[0013] Preferably, in the axial direction of the tube body, the depth of the annular groove gradually decreases from the middle to both ends, and the thickness of the buffer layer gradually increases from the middle to both ends.
[0014] Compared with the prior art, the technical solution of this application has at least the following beneficial technical effects: 1. The present application provides an annular groove on the outer wall of the tube body, and during magnetic pulse crimping, the outer tube is deformed and filled into the annular groove, thereby forming a reliable connection between the outer tube and the inner tube. A support member is provided inside the inner tube, and the support member supports the tube section where the annular groove is located on the inner side of the annular groove. When the inner tube receives the impact force of the outer tube, the impact force is transmitted to the support member, and the pressure is borne by the support member to prevent the tube from deforming inward at the annular groove, thereby ensuring the reliability of the connection between the inner and outer tubes.
[0015] 2. This application provides a support member comprising a support ring with an annular reinforcement rib disposed on the inner side of the support ring. The support ring can be separately machined and formed before being assembled into the pipe body. The support ring's support area covers the pipe section where the annular groove is located. The support ring has low processing and assembly costs, is lightweight, and has a minimal impact on the overall weight of the component. Furthermore, a limiting structure consisting of a limiting rod and a limiting block facilitates accurate installation of the support ring into the inner side of the annular groove during installation on the pipe body, minimizing the impact on processing efficiency.
[0016] 3. The present application further provides a buffer layer on the inner wall of the annular groove. The buffer layer is made of a material with a strength lower than that of the pipe material. When the outer pipe is deformed and filled into the annular groove, the buffer layer first contacts the outer pipe and is squeezed and deformed by the outer pipe. The deformation of the buffer layer absorbs the impact energy, thereby reducing the impact force transmitted to the inner pipe, i.e., the pipe body, thereby protecting the pipe body, reducing internal damage to the pipe body, and avoiding inward deformation of the pipe body, thereby ensuring the structural strength of the pipe body and the reliability of the connection with the outer pipe.
[0017] 4. This application provides an annular deformation groove on the buffer layer. The annular deformation groove provides space for the deformation of the buffer layer. The non-annular deformation groove portion of the buffer layer is squeezed and deformed by the outer pipe and filled into the annular deformation groove, thereby ensuring that the buffer layer fully deforms to absorb impact energy without affecting the normal deformation of the outer pipe and filling into the annular groove. Since the annular groove gradually decreases in depth from the middle to the ends in the axial direction of the tube body, the outer pipe first contacts the annular groove near the notch and gradually extends to contact the bottom of the annular groove. The impact force on the buffer layer near the notch of the annular groove is greater, and the impact force gradually decreases near the bottom of the annular groove. Therefore, the buffer layer is configured to gradually increase in thickness from the middle to the ends in the axial direction of the tube body. The buffer layer is thicker near the notch of the annular groove, has a greater deformation, and absorbs more impact energy. The buffer layer is thinner near the bottom of the annular groove and has a smaller deformation. This ensures that the thickness of the buffer layer formed between the outer and inner pipes is uniform, ensuring that the outer pipe uniformly deforms and fills into the annular groove, forming a reliable connection with the inner pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 A schematic structural diagram of a pipe fitting for a magnetic pulse crimping process according to an embodiment of the present invention; Figure 2 A schematic structural diagram of a pipe support member used in a magnetic pulse pressing process according to an embodiment of the present invention, wherein a support shaft and support spokes are provided; Figure 3 A schematic structural diagram of a buffer layer in a pipe used in a magnetic pulse pressing process according to an embodiment of the present invention; Figure 4 A schematic structural diagram of a filling layer ultimately formed from a buffer layer in a pipe used in a magnetic pulse pressing process according to an embodiment of the present invention.
[0019] Description of reference numerals: 1. Tube body; 11. Annular groove; 2. Support member; 21. Support ring; 22. Annular reinforcement rib; 23. Support shaft; 24. Support spoke; 25. Limit rod; 26. Limit block; 3. Buffer layer; 31. Annular deformation groove; 3a. Filling layer. DETAILED DESCRIPTION
[0020] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.
[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.
[0022] It will be understood that spatial relational terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be understood that in addition to the orientations shown in the figures, spatial relational terms also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, the element or feature described as "under" or "beneath" or "beneath" the other elements will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include alternative orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.
[0023] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection" should be understood as "electrical connection", "communication connection", etc., if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.
[0024] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
[0025] Reference Figure 1-4As shown, an embodiment of the present application provides a pipe fitting for a magnetic pulse crimping process, which includes a pipe body 1 and a support member 2. An annular groove 11 is provided on the outer wall of the pipe body 1 around its own axis. The support member 2 is arranged in the pipe body 1 and is located on the inner side of the annular groove 11. The support member 2 is used to limit the inward deformation of the pipe body 1 at the annular groove 11.
[0026] During magnetic pulse crimping, the outer pipe is sleeved within the coil of the magnetic pulse crimping device released from the outside of the pipe body 1. Under the action of the electromagnetic force, the position of the outer pipe corresponding to the annular groove 11 deforms inwardly and fills the annular groove 11 of the pipe body 1, forming a locking structure to achieve a reliable connection between the two pipes. By providing a support member 2 inside the inner pipe, the support member 2 supports the pipe section where the annular groove 11 is located on the inner side of the annular groove 11. When the inner pipe receives the impact force of the outer pipe, the impact force is transmitted to the support member 2. The support member 2 bears the pressure to prevent the pipe from deforming inward at the annular groove 11, thereby ensuring the reliability of the connection between the inner and outer pipes.
[0027] Reference Figure 1 and Figure 3 As shown, the depth of the annular groove 11 gradually decreases from the middle to both ends in the axial direction of the tube body 1. Specifically, the interface is arc-shaped, so that after the outer tube is deformed, an arc-shaped annular protrusion is formed and embedded in the annular groove 11.
[0028] Reference Figure 1-2 As shown, the support member 2 includes a support ring 21 coaxial with the tube body 1. The outer diameter of the support ring 21 is the same as the inner diameter of the tube body 1, and the axial length of the tube body 1 is greater than the axial width of the annular groove 11. In order to improve the radial strength of the support ring 21, an annular reinforcing rib 22 coaxial with the inner wall of the support ring 21 is provided to strengthen the radial strength of the support ring 21. Specifically, multiple annular reinforcing ribs 22 can be provided and spaced axially along the support ring 21. In this embodiment, three annular reinforcing ribs 22 are illustrated.
[0029] The support ring 21 can be separately processed and formed and then assembled into the pipe body 1. The support area of the support ring 21 can cover the pipe section where the ring groove 11 is located. The support ring 21 can be made of lightweight materials such as aluminum alloy to reduce weight and is easy to assemble on the pipe body 1. The processing and assembly costs are low, the weight is small, and the impact on the weight of the total parts is small.
[0030] Reference Figure 2As shown, referring to the figures, in some embodiments, in order to further strengthen the radial strength of the support member 2, a support shaft 23 coaxial with the support ring 21 is provided on the inner side of the support ring 21, and a plurality of support spokes 24 are provided between the support shaft 23 and the annular reinforcement rib 22. The two ends of the support spokes 24 are respectively connected to the support shaft 23 and the annular reinforcement rib 22. The plurality of support spokes 24 are distributed at intervals along the circumference of the support ring 21 to further strengthen the radial strength of the support ring 21 through the support spokes 24, thereby ensuring effective support for the tube body 1.
[0031] Reference Figure 1 As shown, further, when the support ring 21 is assembled onto the pipe body 1, in order to quickly and accurately install the support ring 21 to the inner side of the annular groove 11, the support member 2 also includes a limiting structure connected to the support ring 21. The limiting structure is used to limit the support ring 21 from continuing to move into the pipe body 1 when the support ring 21 is inserted into the pipe body 1 from one end of the pipe body 1 and moves to the inner side of the annular groove 11. Specifically, the limiting structure includes a limiting rod 25. The limiting rod 25 extends axially along the support ring 21 and is connected to the support ring 21 at one end. The other end of the limiting rod 25 is connected to a limiting block 26. In a plane perpendicular to the axis of the support ring 21, the projection of the limiting block 26 is located outside the outer circle of the projection of the support ring 21. In particular, one end of the limiting rod 25 is connected to one end face of the support ring 21, and the side of the limiting rod 25 close to the outer wall of the support ring 21 is flush with the outer wall of the support ring 21. The limiting rod 25, the limiting block 26 and the support ring 21 are integrally formed. Through this arrangement, when the support ring 21 is installed in the tube body 1, when the support ring 21 moves to the inner side of the ring groove 11, the limit block 26 abuts against the end face of the tube body 1 to limit the support ring 21 from continuing to move, thereby realizing rapid positioning and installation of the support ring 21, that is, reducing the impact on processing efficiency.
[0032] Reference Figure 1 and Figure 3 As shown, further, during magnetic pulse crimping, the impact force of the deformation of the outer pipe fitting on the inner pipe body 1 may cause damage to the internal structure of the pipe body 1. In order to reduce the damage, a buffer layer 3 is also provided on the inner wall of the annular groove 11. The material strength of the buffer layer 3 is lower than the material strength of the pipe fitting. The buffer layer 3 is suitable for being squeezed and deformed by the outer pipe fitting when the outer pipe fitting is deformed and filled into the annular groove 11.
[0033] Through the above-mentioned arrangement, the buffer layer 3 is made of a material having a strength lower than that of the pipe material. When the outer pipe is deformed and filled into the annular groove 11, the buffer layer 3 first contacts the outer pipe and is squeezed and deformed by the outer pipe. The deformation of the buffer layer 3 absorbs the impact energy, thereby reducing the impact force transmitted to the inner pipe, i.e., the pipe body 1, thereby protecting the pipe body 1, reducing internal damage to the pipe body 1, and avoiding inward deformation of the pipe body 1, thereby ensuring the structural strength of the pipe body 1 and the reliability of the connection with the outer pipe.
[0034] Specifically, the buffer layer 3 needs to be squeezed and deformed by the outer pipe. Therefore, the material strength of the buffer layer 3 must be lower than that of the outer pipe. The appropriate material is selected based on the materials of the pipe body 1 and the outer pipe. The thickness of the buffer layer 3 is set according to the depth of the annular groove 11. After the final crimping is completed, the outer pipe is deformed to a depth sufficient to fill the annular groove 11 to ensure connection reliability. This allows the buffer layer 3 to deform sufficiently to absorb energy, thereby reducing the impact force on the pipe body 1 and minimizing internal damage to the pipe body 1.
[0035] Reference Figure 1 and Figure 3 As shown, the buffer layer 3 is further provided with an annular deformation groove 31 circumferentially surrounding the axis of the tube body 1. Multiple annular deformation grooves 31 are provided, spaced apart from one end of the buffer layer 3 to the other. The annular deformation grooves 31 provide space for deformation of the buffer layer 3. The portion of the buffer layer 3 not in the annular deformation groove 31 is squeezed and deformed by the outer pipe and filled into the annular deformation groove 31, thereby ensuring that the buffer layer 3 fully deforms to absorb impact energy without affecting the normal deformation of the outer pipe and filling the annular groove 11.
[0036] Reference Figure 3-4 As shown, further, since the depth of the annular groove 11 gradually decreases from the middle to the two ends in the axial direction of the tube body 1, the outer tube first contacts the annular groove 11 near the notch and gradually extends to contact the bottom of the annular groove 11 during the process of deformation and filling into the annular groove 11. The impact force on the buffer layer 3 near the notch of the annular groove 11 is relatively large, and the impact force gradually decreases near the bottom of the annular groove 11. Therefore, the buffer layer 3 is set to gradually increase in thickness from the middle to the two ends in the axial direction of the tube body 1. The thickness of the buffer layer 3 near the notch of the annular groove 11 is large, the deformation is large, and it can absorb more impact energy. The thickness of the buffer layer 3 near the bottom of the annular groove 11 is small, and the deformation is small. Therefore, in the process of deformation and filling into the annular groove 11 by the outer tube, the deformation of the buffer layer 3 gradually decreases from the notch to the bottom, so that the filling layer 3a finally formed by the buffer layer 3 and filled between the outer tube and the inner tube reaches a relatively uniform thickness (refer to Figure 4 As shown), and ensure that the outer pipe is uniformly deformed and filled into the annular groove 11, thereby forming a reliable connection with the inner pipe.
[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A pipe fitting for magnetic pulse crimping process, characterized in that: include: A tube body (1), wherein an annular groove (11) is formed on the outer wall of the tube body (1) around its own axis; A support member (2) is provided in the tube body (1) and is located inside the annular groove (11). The support member (2) is used to limit the inward deformation of the tube body (1) at the annular groove (11).
2. The pipe fitting for magnetic pulse welding according to claim 1, characterized in that: The support member (2) comprises a support ring (21) coaxial with the tube body (1), the outer diameter of the support ring (21) is the same as the inner diameter of the tube body (1), and the axial length of the tube body (1) is greater than the axial width of the annular groove (11).
3. The pipe fitting for magnetic pulse welding according to claim 2, characterized in that: An annular reinforcing rib (22) coaxial with the supporting ring (21) is provided on the inner wall of the supporting ring (21).
4. The pipe fitting for magnetic pulse welding according to claim 2, characterized in that: The support member (2) further comprises a limiting structure connected to the support ring (21), wherein the limiting structure is used to limit the support ring (21) from continuing to move into the tube body (1) when the support ring (21) is inserted into the tube body (1) from one end of the tube body (1) and moves to the inner side of the annular groove (11).
5. The pipe fitting for magnetic pulse welding according to claim 4, characterized in that: The limiting structure comprises a limiting rod (25), wherein the limiting rod (25) extends axially along the support ring (21) and one end is connected to the support ring (21), and the other end of the limiting rod (25) is connected to a limiting block (26), and on a plane perpendicular to the axis of the support ring (21), a projection of the limiting block (26) is located outside the outer circle of the projection of the support ring (21).
6. The pipe fitting for magnetic pulse welding according to claim 1, characterized in that: A buffer layer (3) is provided on the inner wall of the annular groove (11); the material strength of the buffer layer (3) is lower than the material strength of the pipe; the buffer layer (3) is suitable for being squeezed and deformed by the outer pipe when the outer pipe is deformed and filled into the annular groove (11).
7. The pipe fitting for magnetic pulse welding according to claim 6, characterized in that: The buffer layer (3) is provided with an annular deformation groove (31) surrounding the axis of the tube body (1).
8. The pipe fitting for magnetic pulse welding according to claim 7, characterized in that: In the axial direction of the tube body (1), the depth of the annular groove (11) gradually decreases from the middle to both ends, and the thickness of the buffer layer (3) gradually increases from the middle to both ends.