Flaring forming mechanism for thin-wall round pipe
The rotary flaring forming mechanism solves the problem of multiple rotary forming of thin-walled round tubes, enabling rapid diameter change and efficient production, improving the consistency of finished products and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-03-17
AI Technical Summary
In existing technologies, the flaring of thin-walled round tubes is difficult, and the deformation is severe after one forming. Multiple rotations are required for forming, resulting in long production cycles and poor consistency in diameter changes.
The rotary flaring forming mechanism includes a basic inner mold, a forming inner mold, a forming outer mold, a lower ejector rod, and a rotating component. The rotating component drives the basic inner mold and the forming inner mold to rotate. Combined with the lower ejector rod with adjustable insertion depth and the tightening ring, rapid diameter changing forming of thin-walled round tubes is achieved.
This technology enables simultaneous forming of thin-walled round tubes at various points during the flaring process, improving production cycle time, ensuring product consistency, and reducing production costs.
Smart Images
Figure CN223998980U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of round tube processing technology, and in particular to a thin-walled round tube flaring forming mechanism. Background Technology
[0002] Round tubes require necking or flaring during forming to meet dimensional requirements. For the flaring process of thin-walled round tubes, such as... Figure 1 and Figure 2 The material has limited elongation, making molding quite difficult.
[0003] Previous transverse forming mechanisms for round tubes, such as Figure 3 After one flaring, the round tube deforms severely. After one forming, it needs to be rotated and formed multiple times. A single round tube needs to be formed 4 to 6 times, resulting in too many steps, excessively long production cycle time, and extremely inconvenient operation. Moreover, the round tubes formed multiple times have poor diameter variation, affecting the overall product performance. Utility Model Content
[0004] The purpose of this invention is to provide a thin-walled round tube flaring forming mechanism that achieves rapid diameter change of the round tube through structural optimization to meet forming requirements.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A thin-walled circular tube flaring forming mechanism includes a vertically arranged basic inner mold, a forming inner mold, a forming outer mold, a lower ejector rod, and a rotating component, wherein:
[0007] The basic inner mold includes several first segmented blocks distributed in a ring and capable of moving close to or away from the ring center. Each first segmented block has a sloping concave surface on its inner side.
[0008] The forming inner mold includes several second segmented blocks that correspond one-to-one with the first segmented blocks, and the second segmented blocks are fixed to the outer surface of the first segmented blocks.
[0009] The outer forming mold is located at the outer ring of the inner forming mold, and the round tube workpiece to be formed passes between the inner forming mold and the outer forming mold.
[0010] The lower ejector pin is inserted into the inner mold of the foundation, and the insertion depth of the lower ejector pin is adjustable. The lower ejector pin is tapered and keeps in contact with each inclined concave surface.
[0011] The rotating component is fixed to the lower end of the base inner mold. The rotating component is used to drive the base inner mold and the forming inner mold to rotate, so that the forming inner mold can perform flaring and forming while rotating.
[0012] As an optional solution, the thin-walled circular tube flaring forming mechanism also includes tightening rings. Several tightening rings are fitted around the outer ring of the base inner mold. The tightening rings are used to provide tightening force for each first segment block to move toward the annular center. Each first segment block is provided with an installation groove corresponding to each tightening ring.
[0013] As an alternative, the lower end of the forming inner mold is provided with a support edge, which is used to support the end of the round tube workpiece.
[0014] As an alternative, the upper end of the first segment block is in concave-convex fit with the second segment block, and the lower end of the first segment block is provided with a limiting step for supporting the support edge.
[0015] As an optional solution, a workpiece positioning block is provided on the support edge.
[0016] As an alternative, the lower push rod has an axial air passage and several air holes inside. The air holes are distributed around the axial air passage and extend from the axial air passage to the surface of the lower push rod.
[0017] The beneficial effects of this utility model are:
[0018] The thin-walled round tube flaring forming mechanism adopts a rotary flaring forming method, which enables all parts of the circumferential surface of the thin-walled round tube to be formed simultaneously during the flaring process. Especially under rapid diameter change conditions, it can also present better forming quality, ensure the consistency of finished products, improve production cycle time, and reduce production costs. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of a circular tube before it is formed by reducing its diameter;
[0020] Figure 2 This is a schematic diagram of a circular tube after it has been formed with a reduced diameter.
[0021] Figure 3 This is a schematic diagram of an existing transverse forming mechanism for round tubes;
[0022] Figure 4 This is a structural cross-sectional view of the thin-walled circular tube flaring forming mechanism provided in this embodiment of the utility model;
[0023] Figure 5 This is a top view of the thin-walled circular tube flaring forming mechanism provided in this embodiment of the utility model.
[0024] In the attached image:
[0025] 1. Basic inner mold; 11. First segment block; 12. Inclined concave surface; 13. Mounting groove; 14. Limiting step; 2. Forming inner mold; 21. Second segment block; 22. Support edge; 3. Forming outer mold; 4. Lower ejector rod; 41. Axial air passage; 42. Air hole; 5. Workpiece positioning block. Detailed Implementation
[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0029] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0030] Furthermore, the terms "first" and "second" are merely used to distinguish between different terms in description and do not have any special meaning.
[0031] Please see Figures 4 to 5 As shown, this embodiment provides a thin-walled circular tube flaring forming mechanism, including a vertically arranged basic inner mold 1, a forming inner mold 2, a forming outer mold 3, a lower ejector rod 4, and a rotating component, wherein:
[0032] The basic inner mold 1 includes several first segment blocks 11 that are distributed in a ring and can move close to or away from the ring center. Each first segment block 11 has a sloping concave surface 12 on its inner side.
[0033] The forming inner mold 2 includes several second segment blocks 21 that correspond one-to-one with the first segment block 11, and the second segment blocks 21 are fixed on the outer surface of the first segment block 11.
[0034] The outer mold 3 is located at a gap on the outer ring of the inner mold 2, and the round tube workpiece to be formed is inserted between the inner mold 2 and the outer mold 3.
[0035] The lower ejector rod 4 is inserted into the inner mold 1 of the foundation and the insertion depth of the lower ejector rod 4 is adjustable. The lower ejector rod 4 is conical and abuts against each of the inclined concave surfaces 12.
[0036] The rotating component is fixed to the lower end of the base inner mold 1. The rotating component is used to drive the base inner mold 1 and the forming inner mold 2 to rotate, so that the forming inner mold 2 can perform flaring and forming while rotating.
[0037] The outer mold 3 can be installed on the base inner mold 1 and rotate synchronously with the inner mold 2, or it can be fixed, both of which can meet the requirements of outer limit and forming.
[0038] Therefore, by adopting the rotary flaring forming method, all parts of the circumference of the thin-walled round tube can be formed simultaneously during the flaring process. Especially under rapid diameter change conditions, it can also present better forming quality, ensure the consistency of finished products, improve production cycle time, and reduce production costs.
[0039] Optionally, the thin-walled circular tube flaring forming mechanism also includes tightening rings. Several tightening rings are fitted around the outer ring of the base inner mold 1. The tightening rings are used to provide tightening force for each first segment block 11 to move toward the annular center. Each first segment block 11 is provided with an installation groove 13 corresponding to each tightening ring.
[0040] Thus, the tightening ring is tightly connected to each of the first segment blocks 11 through the mounting groove 13, and ensures that the tightening force on each of the first segment blocks 11 is consistent, ensuring that each of the first segment blocks 11 moves synchronously during rotation, thereby further improving the accuracy and stability of the flaring forming.
[0041] Optionally, the lower end of the forming inner mold 2 is provided with a support edge 22, which is used to support the end of the round tube workpiece.
[0042] Thus, the support provides stable support for the 22 pairs of vertical cylindrical workpieces, preventing them from shifting during the rotation and flaring process, ensuring forming accuracy, and further improving the overall forming effect.
[0043] Optionally, the upper end of the first segment block 11 is in concave-convex fit with the second segment block 21, and the lower end of the first segment block 11 is provided with a limiting step 14 for supporting the support edge 22.
[0044] This ensures that the first segment block 11 and the second segment block 21 fit together accurately, and can be further fixed by screws, etc., to ensure structural stability and avoid errors caused by vibration during the molding process.
[0045] Optionally, a workpiece positioning block 5 is provided on the support edge 22. In particular, four workpiece positioning blocks 5 are provided, evenly distributed around the inner mold 2, to position the height of the round tube workpiece.
[0046] Therefore, by limiting the end of the round tube workpiece by the workpiece positioning block 5, the position of the round tube workpiece is accurate during the rotation and flaring process, which further optimizes the forming accuracy and improves the overall forming quality. In addition, the workpiece positioning block 5 and the forming outer mold 3 cooperate to further ensure that the round tube workpiece moves stably within the structure and achieves the target forming effect.
[0047] Optionally, the lower push rod 4 is provided with an axial air passage 41 and a number of air holes 42 inside. The air holes 42 are distributed around the axial air passage 41 and extend from the axial air passage 41 to the surface of the lower push rod 4.
[0048] Therefore, by cooperating with the axial air passage 41 and the air hole 42, a uniform airflow distribution is achieved, avoiding the situation where the lower push rod 4 gets stuck with the base inner mold 1 during the insertion process.
[0049] Among them, the workpiece positioning block 5 and the forming outer mold 3 cooperate to form the positioning part, the lower ejector rod 4, the basic inner mold 1, and the tightening ring form the driving part, and the forming inner mold 2 and the forming outer mold 3 form the core working part, realizing the one-time flaring forming of the round tube workpiece.
[0050] Detailed operation process:
[0051] 1) In the initial state, the lower push rod 4 is completely detached from the base inner mold 1, and the base inner mold 1 is in an inward tightening state under the action of the tightening ring;
[0052] 2) Figure 1 The round tube workpiece to be formed is placed between the inner forming mold 2 and the outer forming mold 3. The end of the round tube workpiece abuts against the support along the 22 and is limited by the workpiece positioning block 5.
[0053] 3) The hydraulic cylinder of the molding equipment pushes upward, driving the lower ejector rod 4 to insert into the base inner mold 1, causing each of the first segment blocks 11 of the base inner mold 1 to expand outward, driving the molding inner mold 2 to gradually widen the round tube workpiece. At the same time, the rotating part of the molding equipment drives the molding inner mold 2 to rotate. As the insertion depth of the lower ejector rod 4 increases, the molding inner mold 2 gradually expands to the design size.
[0054] 4) When the flaring is finished, the inner forming mold 2 and the outer forming mold 3 work together to act on the inner and outer walls of the round tube workpiece, and the flaring process is completed.
[0055] 5) Drive the lower ejector rod 4 to gradually disengage from the base inner mold 1. The base inner mold 1 tightens inward under the action of the tightening ring, at which point it can be removed. Figure 2 The formed round tube workpiece completes one processing cycle.
[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A thin-walled tube flaring mechanism, characterized by, The utility model relates to a vertical arrangement's foundation inner mould (1), forming inner mould (2), forming outer mould (3), lower ejector rod (4) and rotating part, wherein: The foundation inner mould (1) includes a plurality of annularly distributed first split blocks (11) that can move towards or away from the annular center, and each first split block (11) is provided with an inclined concave surface (12) on the inner side surface; The forming inner mould (2) includes a plurality of second split blocks (21) corresponding to the first split blocks (11), and the second split blocks (21) are fixed on the outer side surface of the first split blocks (11); The forming outer mould (3) is located in the outer circle of the forming inner mould (2) with a gap, and the circular pipe workpiece to be formed is arranged between the forming inner mould (2) and the forming outer mould (3); The lower ejector rod (4) is inserted into the foundation inner mould (1), and the insertion depth of the lower ejector rod (4) is adjustable, the lower ejector rod (4) is conical, and the lower ejector rod (4) is in abutment with each inclined concave surface (12); The rotating part is fixed to the lower end of the foundation inner mould (1), and the rotating part is used for driving the foundation inner mould (1) and the forming inner mould (2) to rotate, so that the forming inner mould (2) is expanded and formed while rotating.
2. The thin-walled tube flaring mechanism of claim 1, wherein It also includes a plurality of tightening rings, the tightening rings are sleeved on the outer circle of the foundation inner mould (1), and the tightening rings are used to provide tightening force for the movement of each first split block (11) towards the annular center, each first split block (11) is provided with a mounting groove (13) corresponding to each tightening ring.
3. The thin-walled tube flaring mechanism of claim 1, wherein The lower end of the forming inner mould (2) is provided with a support edge (22) for supporting the end of the circular pipe workpiece.
4. The thin-walled tube flaring mechanism of claim 3, wherein The upper end of the first split block (11) is in concave-convex cooperation with the second split block (21), and the lower end of the first split block (11) is provided with a limiting step (14) for supporting the support edge (22).
5. The thin-walled tube flaring mechanism of claim 3, wherein The support edge (22) is provided with a workpiece positioning block (5).
6. The thin-walled tube flaring mechanism of claim 1, wherein The lower ejector rod (4) is provided with an axial air channel (41) and a plurality of air holes (42) inside, the air holes (42) are circumferentially distributed around the axial air channel (41), and the air holes (42) extend from the axial air channel (41) to the surface of the lower ejector rod (4).