A kind of flat tube bulging forming auxiliary device
By designing an auxiliary device for flat tube bulging, and utilizing the differentiated extrusion and limiting structure of the auxiliary wheels, the problem of uneven rebound force in the forming of large-size flat tubes is solved, thereby improving the forming quality and heat exchange efficiency of the flat tubes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG TONGYUAN PRECISION MASCH CO LTD
- Filing Date
- 2025-08-27
- Publication Date
- 2026-07-24
AI Technical Summary
During the forming process of large-size flat tubes, uneven material resilience can lead to an incomplete shape, local collapse, or concave deformation in the bulging area, affecting heat exchange efficiency and structural accuracy.
A flat tube bulging forming auxiliary device is designed. Through the differentiated design of the first auxiliary wheel and the second auxiliary wheel, the flat tube material is squeezed. The annular groove and the arc groove are used to achieve precise positioning and stress release, so as to ensure the forming quality of the bulging structure.
Effective control of rebound force prevents bulging, collapse, or concave deformation, increases the contact area between the flat tube and the fluid, ensures structural consistency, reduces flow resistance, and improves heat exchange efficiency and system stability.
Smart Images
Figure CN224542957U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flat tube processing technology, specifically to an auxiliary device for forming a flat tube bulge. Background Technology
[0002] In the production of multi-channel flat tubes for heat exchangers, the application of large-size flat tubes is becoming increasingly widespread due to the increase in equipment power and the upgrading of heat exchange requirements. These flat tubes face significant technical challenges during the forming process due to their large overall forming surface and unique structural dimensions.
[0003] In existing technologies, it is difficult to precisely control the springback force of materials in the production of large-size flat tubes. Due to the large forming surface of flat tubes, the stress distribution in different areas of the tube blank varies during forming processes such as stamping and rolling, resulting in uneven plastic deformation of the material and inconsistent springback amounts in different parts after forming. This deviation in springback force control is particularly evident in critical structural areas such as bulges: on the one hand, due to the wide extension range of the material in bulge areas, springback can easily cause the shape to be insufficiently full, resulting in local collapse or flattening, affecting the contact area between the flat tube and the fluid and the heat exchange efficiency; on the other hand, for edges or transition areas that require the formation of arcs, due to the uneven release of springback force, stress concentration can easily lead to concave deformation during subsequent cutting, assembly, or further processing. This concavity not only compromises the structural precision of the flat tube but may also increase the flow resistance of the fluid in the channel, and even induce local eddies, reducing the overall performance of the heat exchange system. Utility Model Content
[0004] To address the technical problems existing in the background art, this utility model provides an auxiliary device for forming a flat tube bulge.
[0005] The technical solution of this utility model is as follows: A flat tube bulging forming auxiliary device is installed between two forming mold frames, which can compress the flat tube raw material during the conveying process. The device includes an installation component, and two installation shafts are arranged vertically and vertically within the installation component. The installation shafts are connected to the installation component via connectors. A first auxiliary wheel is installed on the outer end face of the middle of the two installation shafts, and multiple second auxiliary wheels are installed on the outer end faces of the installation shafts on both sides of the first auxiliary wheel. The outer diameter of the first auxiliary wheel located on the outer end face of the upper installation shaft is smaller than the outer diameter of the second auxiliary wheel. The flat tube material passes between the upper and lower auxiliary wheels, and is squeezed by the cooperation of the first and second auxiliary wheels.
[0006] To facilitate adaptation to flat tubes, the number of second auxiliary wheels on both sides of the first auxiliary wheel is one less than the number of through holes in the corresponding flat tube.
[0007] The specific design of the second auxiliary wheel in this scheme is that three second auxiliary wheels are respectively set on both sides of the two first auxiliary wheels.
[0008] In order to fit the flat tube material, the edges of the two adjacent second auxiliary wheels located at the top are provided with annular grooves, and the adjacent annular grooves together form a receiving groove for accommodating the protrusion of the flat tube material.
[0009] An annular groove is also provided on the edge of the second auxiliary wheel near the first auxiliary wheel, forming a corresponding receiving groove with the smaller diameter first auxiliary wheel.
[0010] In order to extrude the flat tube material in advance, so as to facilitate the folding of the flat tube material and prevent the flat tube material from concave in subsequent steps, the outer edge of the second auxiliary wheel located above and not at the edge is set to an arc shape that convexes outward away from the center, and the corresponding outer edge of the second auxiliary wheel located below is set to an arc shape that is concave inward close to the center.
[0011] In order to limit the flat tube material and prevent it from displacing radially along the mounting shaft, limit plates are installed on the outer edge of the mounting shaft of the two second auxiliary wheels located at the bottom and outermost, and the distance between the limit plates is consistent with the width of the flat tube material.
[0012] The specific design of the mounting component is as follows: the mounting component includes a mounting base plate, and four columns are installed at the four corners of the upper part of the mounting base plate. A top plate is installed on the upper end of each column. Four sets of connectors are provided, and they are installed in pairs between two columns on the same side.
[0013] The connector is specifically designed as follows: the connector includes a mounting block installed between two columns, and the mounting block is fixed to the columns; the two mounting shafts are respectively installed between the two horizontal mounting blocks via bearings.
[0014] To facilitate the subsequent bending and forming of the flat tube material, the width of the first auxiliary wheel is more than twice the width of the second auxiliary wheel.
[0015] The beneficial effects of this utility model are as follows: This utility model effectively solves the problem of difficult control of rebound force during the forming process of large-size flat tubes, and significantly improves the forming quality of the bulging structure. By employing a differentiated design between the first and second auxiliary wheels, and utilizing the arc-shaped design of the outer end face of the first auxiliary wheel (whose outer diameter is smaller than that of the second auxiliary wheel), targeted extrusion can be applied to the bulging area of the flat tube material. This compensates for the springback defects caused by the wide extension range of materials in traditional forming processes, preventing local collapse or flattening of the bulging area and ensuring a full shape. This, in turn, guarantees the contact area between the flat tube and the fluid, laying the foundation for improved heat exchange efficiency. The device achieves comprehensive optimization through the coordinated operation of multiple sets of auxiliary wheels. The annular grooves on the edges of adjacent second auxiliary wheels together form a receiving groove, which can precisely limit the protruding parts of the flat tube material and prevent displacement caused by uneven force during forming. The convex and concave arc surface design of the non-edge second auxiliary wheels can adapt to the forming requirements of the transition part of the flat tube. By extruding, the subsequent bulging of the flat tube is formed, effectively releasing stress and preventing concave deformation in subsequent processes. This ensures the consistency of the overall structure of the flat tube, reduces the flow resistance of the fluid in the channel, and improves the stability of the heat exchange system. Attached Figure Description
[0016] The advantages and solutions of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.
[0017] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of this solution; Figure 2 This is a partial cross-sectional view of the scheme; Figure 3 This is a partial schematic diagram of the auxiliary wheel (not in working state). Figure 4 This is a partial schematic diagram of the auxiliary wheel (in working condition). The components represented by the various reference numerals in the diagram are: 1. Flat tube raw material; 2. Mounting components; 21. Mounting base plate; 22. Column; 23. Top plate; 3. Mounting shaft; 4. Connecting parts; 41. Mounting block; 42. Bearing; 5. First auxiliary wheel; 6. Second auxiliary wheel; 7. Annular groove; 8. Receiving groove; 9. Limiting plate. Detailed Implementation
[0018] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.
[0019] Example This embodiment discloses an auxiliary device for bulging flat tubes, which is mainly used in the bulging forming process of large-size multi-channel flat tubes. It is set between two sets of forming mold frames. The forming mold frames are devices on the flat tube production line, which will not be described in detail. By precisely extruding the flat tube raw material 1 during the conveying process, the problem of uneven material rebound force is improved, and the forming quality of the bulging flat tube structure is improved. The following is a detailed description with reference to the figure.
[0020] This embodiment provides an auxiliary device for forming a flat tube bulge. See [link / reference] Figure 1 and Figure 2 The core support structure of this device is the mounting assembly 2, which includes a horizontally placed mounting base plate 21 made of high-strength steel plate, providing stable support for the entire device. Four vertical columns 22 are installed at the four corners of the upper end of the mounting base plate 21. The columns 22 are fixed to the base plate by welding or other methods, forming a rectangular frame structure. A top plate 23 is connected to the upper end of the columns 22, and the top plate 23 is also fixed to the columns 22, further enhancing the overall rigidity of the mounting assembly 2. Between two columns 22 on the same side, two sets of connectors 4 are installed. The connectors 4 are specifically rectangular mounting blocks 41, which are fixed to the columns 22 by bolts. The upper and lower sets of mounting blocks 41 are symmetrically distributed, providing a mounting foundation for the mounting shaft 3.
[0021] In this embodiment, two horizontal mounting shafts 3 are installed within the mounting assembly 2 via connectors 4. The two mounting shafts 3 are spaced apart vertically and pass through the center holes of two sets of mounting blocks 41 on the same side. The mounting shafts 3 are connected to the mounting blocks 41 via bearings 42, ensuring flexible rotation of the mounting shafts 3. A first auxiliary wheel 5 is installed on the outer end face of each of the two mounting shafts 3 at its midpoint. The first auxiliary wheel 5 is located in the middle of the mounting shaft 3, and the center lines of the two axes are coplanar. The first auxiliary wheel 5 is fixed to the mounting shaft 3 via a key connection and rotates synchronously with the mounting shaft 3. The width of the first auxiliary wheel 5 is larger than twice the width of the second auxiliary wheels 6 on both sides. Its main function is to extrude and form the bulging bending area of the flat tube raw material 1, ensuring that the length of the raw material located at the first auxiliary wheel 5 after bending is not less than the length of the raw material at the corresponding second auxiliary wheel 6, so that the dimensions of the multiple channels are not significantly different. On the outer end faces of the mounting shafts 3 on both sides of the first auxiliary wheel 5, a plurality of second auxiliary wheels 6 are also installed. The second auxiliary wheels 6 are also fixed to the mounting shafts 3 by key connection. The number of second auxiliary wheels 6 is mainly determined by the number of through holes in the flat tube. The number of second auxiliary wheels 6 on both sides of the first auxiliary wheel 5 is one less than the number of through holes in the corresponding flat tube. That is, the number of second auxiliary wheels 6 is one less than the number of through holes. This is because the pressing position of each second auxiliary wheel 6 corresponds to a through hole after bending, while the pressing position of the first auxiliary wheel 5 is folded to form another through hole.
[0022] Based on the above structure, combined with Figure 3 The outer diameter of the first auxiliary wheel 5 located on the outer end face of the upper mounting shaft 3 is smaller than that of the second auxiliary wheel 6, while the outer diameters of the two below are the same, which can ensure that a space is formed between the two opposing first auxiliary wheels 5 to accommodate the bulge of the flat tube material 1.
[0023] Taking advantage of the multi-channel flat tube's structural characteristics, three second auxiliary wheels 6 are respectively arranged on both sides of the two first auxiliary wheels 5, enabling targeted compression of each channel area of the flat tube. The edges of the two adjacent upper second auxiliary wheels 6 are each provided with annular grooves 7, the cross-section of which is arc-shaped. Figure 4 In other words, during the forming of the flat tube material 1, adjacent annular grooves 7 together form a complete receiving groove 8, which is used to accommodate the protruding part of the flat tube material 1 during the extrusion process, preventing the protrusion from being over-compressed and deformed. The same annular groove 7 is also provided on the edge of the second auxiliary wheel 6 near the first auxiliary wheel 5. This annular groove 7 and the smaller diameter first auxiliary wheel 5 also form a corresponding receiving groove 8, ensuring that the protruding part of the flat tube material 1 can pass smoothly through the edge area in contact with the first auxiliary wheel 5.
[0024] One of the key design features of this solution is that, to accommodate the forming requirements of different parts of the flat tube, the outer edge of the upper, non-edge-located second auxiliary wheel 6 is designed as an outward-convex arc shape away from the center. This arc structure can apply outward extrusion force to the corresponding area of the flat tube material 1, which helps to form a full, bulging structure. The outer edge of the lower corresponding second auxiliary wheel 6 is set as an inward-concave arc shape close to the center. The concave arc matches the outward-convex arc above. The upper and lower auxiliary wheels work together to achieve precise extrusion of the flat tube material 1, making the bulging part of the flat tube plate protrude outward. This avoids local collapse or flattening of the bulging part due to the springback of the material in subsequent processes, thus ensuring the space of the through hole in the flat tube after bending.
[0025] On the mounting shaft 3 located below, limit discs 9 are also installed on the outermost two second auxiliary wheels 6. The limit discs 9 are fixed to the mounting shaft 3, and the distance between the two limit discs 9 is consistent with the width of the flat tube raw material 1. The limit discs 9 can perform lateral positioning on the flat tube raw material 1 during the conveying process, preventing the flat tube from shifting during the extrusion process and ensuring the accuracy of the conveying of the flat tube raw material 1.
[0026] During operation, the flat tube material 1 is conveyed from between the previous set of forming mold frames, enters the gap between the upper and lower mounting shafts 3, and passes sequentially through the upper and lower first auxiliary wheels 5 and the second auxiliary wheel 6. As the mounting shafts 3 rotate, the upper and lower auxiliary wheels simultaneously compress the flat tube material 1: the first auxiliary wheel 5 mainly acts on the bulging core area of the flat tube, ensuring that the material in the bulging area is fully deformed through its larger width and appropriate pressure, reducing collapse caused by springback; the second auxiliary wheels 6 on both sides compress the gap area between the through holes and the edge area of the flat tube. The annular groove 7 of the upper second auxiliary wheel 6 cooperates with the corresponding structure below, which can not only accommodate the protruding part of the flat tube, but also moderately compress the two sides of the protrusion, improve the stress distribution of the material, improve the structural strength of the bulging part of the flat tube material 1 in subsequent processes, and reduce the problems of bulging collapse and indentation.
Claims
1. A flat tube bulging forming auxiliary device, which is arranged between two forming mold frames and is capable of extruding flat tube raw material (1) during the conveying process, characterized in that, The assembly includes a mounting component (2), and two mounting shafts (3) are arranged vertically and vertically within the mounting component (2). The mounting shafts (3) are connected to the mounting component (2) via connectors (4). A first auxiliary wheel (5) is mounted on the outer end face of the middle of the two mounting shafts (3), and multiple second auxiliary wheels (6) are mounted on the outer end faces of the mounting shafts (3) on both sides of the first auxiliary wheel (5). The outer diameter of the first auxiliary wheel (5) located on the outer end face of the upper mounting shaft (3) is smaller than the outer diameter of the second auxiliary wheel (6). The flat tube material (1) passes between the upper and lower auxiliary wheels, and is squeezed by the cooperation of the first auxiliary wheel (5) and the second auxiliary wheel (6).
2. The flat tube bulging forming auxiliary device according to claim 1, characterized in that, The number of second auxiliary wheels (6) on both sides of the first auxiliary wheel (5) is one less than the number of through holes in the corresponding flat tube.
3. The flat tube bulging forming auxiliary device according to claim 2, characterized in that, Three second auxiliary wheels (6) are respectively provided on both sides of the two first auxiliary wheels (5).
4. The flat tube bulging forming auxiliary device according to claim 1, characterized in that, The edges of the two adjacent second auxiliary wheels (6) located above each have annular grooves (7) facing each other, and the adjacent annular grooves (7) together form a receiving groove (8) for accommodating the protrusion of the flat tube material (1).
5. The flat tube bulging forming auxiliary device according to claim 4, characterized in that, An annular groove (7) is also provided on the edge of the second auxiliary wheel (6) near the first auxiliary wheel (5), forming a corresponding receiving groove (8) with the smaller diameter first auxiliary wheel (5).
6. The flat tube bulging auxiliary device according to claim 1, characterized in that, The outer edge of the second auxiliary wheel (6) located above and not on the edge is set to an arc shape that is convex outward away from the center, and the outer edge of the corresponding second auxiliary wheel (6) located below is set to an arc shape that is concave inward close to the center.
7. The flat tube bulging forming auxiliary device according to claim 1, characterized in that, A limiting disc (9) is installed on the outer edge of the mounting shaft (3) on the two outermost second auxiliary wheels (6) located at the bottom, and the distance between the limiting discs (9) is consistent with the width of the flat tube material (1).
8. The flat tube bulging auxiliary device according to claim 1, characterized in that, The mounting assembly (2) includes a mounting base plate (21), and four columns (22) are installed at the four corners of the upper end of the mounting base plate (21). A top plate (23) is installed on the upper end of the columns (22). The connector (4) is provided in four sets, and is installed in pairs between two columns (22) on the same side.
9. The flat tube bulging forming auxiliary device according to claim 8, characterized in that, The connector (4) includes a mounting block (41) installed between two columns (22), and the mounting block (41) is fixed to the column (22). The two mounting shafts (3) are respectively installed between the two horizontal mounting blocks (41) via bearings (42).
10. The flat tube bulging forming auxiliary device according to claim 1, characterized in that, The width of the first auxiliary wheel (5) is more than twice the width of the second auxiliary wheel (6).