Core for bending forming of triangular metal tubular beam
By designing the core of the Z-shaped structure combined with the guide sleeve, the problem of collapse of the inner cavity in the bending and forming of triangular metal pipe beams is solved, efficient support and convenient replacement are achieved, and molding quality and production efficiency are improved.
Patent Information
- Application Number
- CN202421665760.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-07-15
AI Technical Summary
In the bending and forming process of triangular metal pipe beams, it is difficult to effectively support the cavity cavity, resulting in collapse, and the plastic core life is short and the replacement is frequent, which increases the impact of cost and production efficiency.
A core used for bending and forming of triangular metal pipe beams is designed. The core section with a zigzag structure is used to form a triangular prism structure through screw connection, combining the guide sleeve and push-pull rod to achieve the smooth entry and extraction of the core section.
The core can effectively support the bending and forming of triangular metal pipe beams, reduce internal cavity collapse, improve molding quality, and facilitate the extraction and replacement of the core, reducing production costs and improving efficiency.
Smart Images
Figure CN222999441U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of metal pipe beam bending and forming, and particularly to a core for bending and forming a triangular metal pipe beam. Background Art
[0002] Stretch bending is a forming process that bends metal sheets, pipes, and profiles into workpieces with a certain curvature, shape, and size. Stretch bending forming is widely used in the forming of aluminum alloy bumpers in the automotive industry.
[0003] When materials are stretch bent, the stress states of each part in the deformation zone are different. The part in the middle of the cross-section that does not deform is called the neutral layer. The metal outside the neutral layer is subjected to tensile stress and undergoes elongation deformation. The metal inside the neutral layer is subjected to compressive stress and undergoes compression deformation. Therefore, when the cross-sectional size is large, it is very easy to collapse in the cross-sectional direction, which is also one of the very important factors for whether the stretch bending process can meet industrial production. In the pipe stretch bending process, steel or plastic cores are usually inserted into the cavity to ensure that it does not collapse. The core is inserted into the profile before stretch bending. As the stretch bending progresses, it follows the profile to bend and at the same time props up the inner cavity of the profile to ensure that it does not collapse. For special-shaped cross-sections, especially small-sized triangular cross-sections, due to limited space, an integral plastic core is usually adopted in the past. However, the plastic core has a low service life, needs to be replaced frequently, and has a high cost and affects production efficiency in the long run. Content of the Utility Model
[0004] The purpose of the present utility model is to provide a core for bending and forming a triangular metal pipe beam in view of the drawbacks of the prior art, so as to solve the problems mentioned in the background art.
[0005] The problems of the present utility model are solved by the following technical solutions:
[0006] A core for bending and forming a triangular metal pipe beam includes core segments, a push-pull rod, and a guide sleeve; multiple core segments are provided and are sequentially connected by screws. The head of the first core segment is set to be conical to facilitate the core to enter and exit the metal pipe beam, and the tail core segment is connected to the push-pull rod; the push-pull rod is of a triangular prism structure, and the guide hole on the guide sleeve matches the outer shape of the push-pull rod. The guide sleeve is rotatably connected to the frame; a single core segment is in a Z-shaped structure to facilitate overlapping connection between adjacent core segments; after all core segments are sequentially and partially overlapped and connected, the whole is in a triangular prism structure that matches the inner cavity of the metal pipe beam.
[0007] The core for bending and forming a triangular metal pipe beam described above has a front joint portion and a rear joint portion provided on the core segment. The cross-sectional dimensions of the front joint portion and the rear joint portion are smaller than those of the middle part of the core segment, and the cross-section of the middle part of the core segment is a triangle matching the cross-section of the metal pipe beam; the rear joint portion of the previous core segment matches the front joint portion of the subsequent core segment; mutually matching connection holes are respectively provided on the front joint portion and the rear joint portion. After the front joint portion and the rear joint portion of adjacent core segments are superposed and assembled, they are connected by screws.
[0008] The core for bending and forming a triangular metal pipe beam described above has the core segments gradually increasing in size from front to back. After all the core segments are connected together, the whole shows a taper design with a smaller front and a larger rear, so as to facilitate the entry of the core before the bending of the metal pipe beam and the extraction of the core after the bending and forming.
[0009] The core for bending and forming a triangular metal pipe beam described above has the screw rod of the screw being of a two-section structure, consisting of a front section and a rear section. Threads are provided on the front section, and internal threads matching the threads on the front section are provided in the connection hole on the rear joint portion; the outer diameter of the rear section matches the inner diameter of the connection hole on the front joint portion. Beneficial effects
[0010] Compared with the prior art, the present utility model has the following advantages: First, the core segment with a Z-shaped structure is adopted, and the size of a single core segment can be designed to be smaller. When the size of the core segment is small, the degree of fit between the inner cavity wall of the metal pipe beam and the core during the bending and forming of the metal pipe beam can be improved, so as to realize sufficient and saturated support of the core for the triangular metal pipe beam. At the same time, it is convenient to extract the core after the triangular metal pipe beam is bent and formed. Second, a guide sleeve is provided to cooperate with the push-pull rod, which can guide the core segment to smoothly enter the metal pipe beam, and at the same time, it can also reduce the scratching of the inner cavity of the metal pipe beam when the core segment enters. Third, when the Z-shaped core segments are connected to adjacent core segments, the connection is achieved through two-layer superposition. Compared with the three-layer superposition of the cross connection used for bending a rectangular metal pipe beam, the structure is more compact and convenient for the use of the triangular metal pipe beam. Description of the drawings
[0011] The present utility model will be further described in detail below with reference to the drawings.
[0012] Figure 1 is the overall structural schematic diagram of the present utility model;
[0013] Figure 2 is the partial cross-sectional schematic diagram of the present utility model;
[0014] Figure 3 is the screw structural schematic diagram of the present utility model;
[0015] Figure 4 is the front-section and rear-section structural schematic diagram of the screw of the present utility model;
[0016] The symbols in the figure represent:
[0017] 1. core section, 2. push-pull rod, 3. screw, 4. metal tube beam, 5. guide sleeve, 6. frame, 1-1. front joint, 1-2. rear joint, 3-1. front section, 3-2. rear section. DETAILED DESCRIPTION
[0018] See also Figures 1-3 The utility model includes a core segment 1, a push-pull rod 2, and a guide sleeve 5; the core segment 1 is provided with multiple segments, which are connected in sequence by screws 3, the head of the first core segment 1 is set to a cone, which is convenient for the core to enter and exit the metal tube beam 4, and the tail core segment 1 is connected to the push-pull rod 2; the push-pull rod 2 is a triangular prism structure, the guide hole on the guide sleeve 5 matches the shape of the push-pull rod 2, the guide sleeve 5 can be rotatably connected to the frame 6, the guide sleeve 5 can be provided with a rotating shaft, and the frame 6 is provided with a shaft sleeve matching the rotating shaft, and the rotation of the guide sleeve 5 facilitates the core to follow the bending of the metal tube beam 4; a single core segment 1 is a Z-shaped structure, which is convenient for overlapping connection between adjacent core segments 1; after all core segments 1 are partially overlapped and connected in sequence, the whole is a triangular prism structure matching the inner cavity of the metal tube beam 4.
[0019] The core segment 1 with a Z-shaped structure can be designed to be smaller in size. The small size of the core segment 1 has two advantages: first, it can form sufficient saturated support for the triangular metal tube beam 4 when bending; second, it is convenient to pull out the core after the triangular metal tube beam 4 is bent into shape.
[0020] The connection between the core segments can be made as follows: the core segment 1 is provided with a front joint portion 1-1 and a rear joint portion 1-2, the cross-sectional dimensions of the front joint portion 1-1 and the rear joint portion 1-2 are smaller than the cross-sectional dimensions of the middle portion of the core segment 1, and the cross-sectional dimensions of the middle portion of the core segment 1 are a triangle that matches the cross-sectional dimensions of the metal tube beam 4; the rear joint portion 1-2 of the previous core segment 1 matches the front joint portion 1-1 of the next core segment 1; the front joint portion 1-1 and the rear joint portion 1-2 are respectively provided with mutually matching connection holes, and the front joint portions 1-1 and the rear joint portions 1-2 of adjacent core segments 1 are superimposed and assembled, and then connected by screws 3. The above connection method facilitates the rotation between the core segments 1, thereby providing sufficient support for the metal tube beam 4 when it is bent and formed.
[0021] In order to further facilitate the core segment 1 to enter and exit the triangular metal tube beam, especially to extract the core after bending, the following solution can be adopted: the size of the core segment 1 gradually increases from front to back, and after all the core segments 1 are connected as a whole, the overall taper design is small in the front and large in the back, so as to facilitate the entry of the core before bending the metal tube beam 4 and the extraction of the core after bending. The core formed after the core segments 1 are connected is a triangular prism with a taper, and its overall taper, that is, the angle between each edge and the bottom edge, can be controlled at 0.3-0.5 degrees.
[0022] Since the core segments 1 are small in size, after the core segments 1 are connected, it is necessary to ensure that they can smoothly enter and exit the inner cavity of the metal pipe beam 4, and at the same time ensure reliable connection and rotation. The design of the connection holes and screws between the core segments 1 is as follows: The screw rod of the screw 3 is of a two-stage structure, consisting of a front section 3-1 and a rear section 3-2. Threads are provided on the front section 3-1, and internal threads matching the threads on the front section 3-1 are provided in the connection holes on the rear joint part 1-2; the outer diameter of the rear section 3-2 matches the inner diameter of the connection hole on the front joint part 1-1.
[0023] During bending forming, the initial state of the core is straight. After the metal pipe beam is placed at the processing position, under the guiding action of the guiding sleeve 5 and the push-pull rod 2, the push-pull rod 2 starts to push the core into the inner cavity of the metal pipe beam under the drive of the oil cylinder. There is an inverted chamfer at the head of the core so that it can penetrate without hitting the product part. After penetration, after clamping the metal pipe beam, the core starts to rotate around the unloading screw as the metal pipe beam bends and forms, so as to support the cavity without collapsing. After the bending forming is completed, the push-pull rod 2 moves backward, driving the core to withdraw from the metal pipe beam 4.
Claims
1. A core for bending a triangular metal tube beam, characterized in that: The invention comprises a core section (1), a push-pull rod (2), and a guide sleeve (5); the core section (1) is provided with multiple sections, which are connected in sequence by screws (3); the head of the first core section (1) is set to be conical, so that the core can be easily inserted into and out of the metal tube beam (4); the tail core section (1) is connected to the push-pull rod (2); the push-pull rod (2) is a triangular prism structure, the guide hole on the guide sleeve (5) matches the shape of the push-pull rod (2), and the guide sleeve (5) is rotatably connected to the frame (6); a single core section (1) is in a Z-shaped structure, so that adjacent core sections (1) can be overlapped and connected; after all the core sections (1) are partially overlapped and connected in sequence, the whole is a triangular prism structure matching the inner cavity of the metal tube beam (4).
2. The core for bending and forming a triangular metal tube beam according to claim 1, characterized in that: The core segment (1) is provided with a front joint portion (1-1) and a rear joint portion (1-2); the cross-sectional dimensions of the front joint portion (1-1) and the rear joint portion (1-2) are smaller than the cross-sectional dimensions of the middle portion of the core segment (1); the cross-sectional dimensions of the middle portion of the core segment (1) are triangular and match the cross-sectional dimensions of the metal tube beam (4); the rear joint portion (1-2) of the previous core segment (1) matches the front joint portion (1-1) of the next core segment (1); the front joint portion (1-1) and the rear joint portion (1-2) are respectively provided with mutually matching connection holes; after the front joint portions (1-1) and the rear joint portions (1-2) of adjacent core segments (1) are stacked and assembled, they are connected by screws (3).
3. The core for bending and forming a triangular metal tube beam according to claim 1, characterized in that: The size of the core segment (1) increases gradually from front to back, and after all the core segments (1) are connected as one, the whole is designed to be small at the front and large at the back, so as to facilitate the entry of the core before the metal tube beam (4) is bent and the extraction of the core after the bending is formed.
4. The core for bending and forming a triangular metal tube beam according to claim 2, characterized in that: The screw rod of the screw (3) is a two-section structure, consisting of a front section (3-1) and a rear section (3-2); the front section (3-1) is provided with a thread, and the connection hole on the rear connecting portion (1-2) is provided with an internal thread matching the thread on the front section (3-1); the outer diameter of the rear section (3-2) matches the inner diameter of the connection hole on the front connecting portion (1-1).