Combined tool for bending and forming non-closed circular tube sheet metal part

Abstract

The utility model relates to the field of sheet metal part forming, in particular to a combined tool for bending forming of a non-closed circular tube sheet metal part, which comprises a stamping die for preliminary forming and a correcting tool for correcting forming, the stamping die comprises an upper male die and a lower female die, and the upper male die and the lower female die can be clamped and matched with each other. The correction tool comprises an upper correction tool and a lower correction tool, an upper correction circular groove is formed in the lower portion of the upper correction tool, a lower correction circular groove is formed in the upper portion of the lower correction tool, and a correction circular rod is placed between the upper correction tool and the lower correction tool. According to the combined tool, deformation can be effectively controlled through secondary bending, meanwhile, the combined tool is easy to operate and rapid in positioning forming, and the problems that a die is long in period, high in price and the like are solved. According to the combined tool, stress generated by deformation of a plate is effectively released through a forming mode of two steps, deformation of a product caused by residual stress is avoided, the forming size of the product is solidified, meanwhile, the tool is low in price and convenient to operate, time is saved, and the production and machining efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to a combination tooling, specifically a combination tooling for bending and forming non-enclosed circular tube sheet metal parts, belonging to the field of sheet metal forming. Background Technology

[0002] Sheet metal bending is widely used in parts manufacturing. The principle is to use "reverse thinking" based on the shape of the part, unfolding its shape and, considering the material's ductility and the practicality of the bending fixture, bending the sheet metal into different shapes and modified forms to create fixed shape characteristics. This is typically done using a punch press and related molds, but mold design is time-consuming and expensive. Non-closed circular tubes are used in the assembly and development of aircraft parts. The material is commonly aluminum sheet, with a rectangular groove along the axial direction. Currently, punch presses and molds are used to process the sheet metal. However, sheet metal processing is susceptible to stress, making it difficult to avoid deformation due to residual stress. Utility Model Content

[0003] To address the problems in the existing technology, this utility model provides a combined tooling for bending and forming non-enclosed circular tube sheet metal parts.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A combined tooling for bending and forming non-enclosed circular tube sheet metal parts includes a stamping die for initial forming and a correction tooling for correcting forming. The stamping die includes an upper punch and a lower die, which can be interlocked and fitted together. The correction tooling includes an upper correction tooling with an upper correction groove at the bottom and a lower correction tooling with a lower correction groove at the top. A correction bar is placed between the upper correction tooling and the lower correction tooling.

[0006] Optionally, the upper punch includes a top plate, a guide plate is connected to the bottom of the top plate, and an extrusion plate is connected to the bottom of the guide plate.

[0007] Optionally, the extrusion plate includes a convex semicircular segment and a convex square segment with both sides arranged vertically. The convex square segment is located above the convex semicircular segment, with its bottom integrally connected to the convex semicircular segment and its top integrally connected to the guide plate.

[0008] Optionally, both sides of the connection between the bottom of the guide plate and the extrusion plate are downwardly convex end faces, and both sides of the connection between the bottom of the top plate and the guide plate are upwardly convex end faces.

[0009] Optionally, the lower die includes a guide cavity and a forming cavity, the guide cavity being located above the forming cavity and integrally formed with the forming cavity.

[0010] Optionally, the top two sides of the guide cavity are both concave end faces, and the bottom two sides of the guide cavity are both concave end faces.

[0011] Optionally, the lower half of the forming cavity is a concave semicircular segment, and the upper half is a concave square segment, with the concave semicircular segment and the concave square segment being integrally formed.

[0012] Optionally, the bottom two sides of the upper correction fixture are both upper end faces, and the top two sides of the lower correction fixture are both lower end faces. When the upper correction fixture and the lower correction fixture are connected, the upper end faces and the lower end faces abut against each other.

[0013] The beneficial effects of this utility model are:

[0014] This modular tooling effectively controls deformation through secondary bending. It is simple to operate, allows for rapid positioning and forming, and eliminates the drawbacks of long mold cycles and high costs. The tooling employs a two-step forming process: effectively releasing stress generated by sheet metal deformation, preventing product deformation due to residual stress, and solidifying the formed dimensions. Furthermore, the tooling is inexpensive, easy to operate, and time-saving, significantly improving production efficiency. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the sheet metal structure before bending in this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the non-closed circular tube semi-finished product after being stamped by a stamping die in this utility model.

[0018] Figure 3 This is a schematic diagram of the finished non-closed circular tube structure after modification and finishing in this utility model.

[0019] Figure 4 This is a schematic diagram of the stamping die structure in this utility model.

[0020] Figure 5 This is a schematic diagram of the upper punch structure in this utility model.

[0021] Figure 6 This is a schematic diagram of the lower punch structure in this utility model.

[0022] Figure 7 This is a schematic diagram of the correction tooling structure in this utility model.

[0023] Figure 8 This is a schematic diagram of the upper correction tooling structure in this utility model.

[0024] Figure 9This is a schematic diagram of the lower correction tooling structure in this utility model.

[0025] Figure 10 A schematic diagram of the modified circular bar structure in this utility model.

[0026] In the diagram: 1. Sheet metal; 2. Semi-finished non-closed round tube; 3. Finished non-closed round tube; 4. Upper punch; 5. Lower die; 6. Upper correction fixture; 7. Lower correction fixture; 8. Correction rod; 21. Semi-circular segment; 22. Square segment; 31. Square groove; 41. Convex semi-circular segment; 42. Convex square segment; 43. Lower convex end face; 44. Upper convex end face; 51. Concave semi-circular segment; 52. Concave square segment; 53. Lower concave end face; 54. Upper concave end face; 61. Upper end face; 62. Upper correction groove; 71. Lower end face; 72. Lower correction groove. Detailed Implementation

[0027] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] Please see Figure 1-10 As shown, a combined tooling for bending and forming non-enclosed circular tube sheet metal parts includes a stamping die for initial forming and a correction tooling for correcting forming. The stamping die includes an upper punch 4 and a lower die 5, which can be fitted together. The correction tooling includes an upper correction tooling 6 with an upper correction groove 62 at the bottom and a lower correction tooling 7 with a lower correction groove 72 at the top. A correction rod 8 is placed between the upper correction tooling 6 and the lower correction tooling 7.

[0029] Specifically, the upper punch 4 includes a top plate, a guide plate connected to the bottom of the top plate, and an extrusion plate connected to the bottom of the guide plate. The extrusion plate includes a semi-circular convex semi-circular segment 41 and a convex square segment 42 with both sides vertically arranged. The convex square segment 42 is located above the convex semi-circular segment 41, and its bottom is integrally connected to the convex semi-circular segment 41, while its top is integrally connected to the guide plate. The bottom of the guide plate has two lower convex end faces 43 at the connection with the extrusion plate, and the bottom of the top plate has two upper convex end faces 44 at the connection with the guide plate. The lower die 5 includes a guide cavity and a forming cavity. The guide cavity is located above the forming cavity and is integrally formed with the forming cavity. The top two sides of the guide cavity have upper concave end faces 54, and the bottom two sides of the guide cavity have lower concave end faces 53. The lower half of the forming cavity is a concave semi-circular segment 51, and the upper half is a concave square segment 52. The concave semi-circular segment 51 and the concave square segment 52 are integrally formed.

[0030] When sheet 1 needs initial forming, it is placed at the bottom of the guide cavity inside the lower die 5. The bottom sides of sheet 1 contact the lower concave end faces 53 on both sides, which support and limit the sheet 1. Then, the upper punch 4 moves downward into the lower die 5 and engages with it. The convex semicircular segment 41 presses sheet 1 completely into the forming cavity of the lower die 5, and the convex semicircular segment 41 and the convex square segment 42 also enter the forming cavity. The lower convex end face 43 contacts the lower concave end face 53, and the upper convex end face 44 contacts the upper concave end face 54. The convex semicircular segment 41 and the convex square segment 42 cooperate with the concave semicircular segment 51 and the concave square segment 52 in the forming cavity, respectively, to extrude sheet 1 into a non-closed cylindrical semi-finished product 2. Then, the upper punch 4 moves upward to disengage from the lower die 5, and the non-closed cylindrical semi-finished product 2 is ready. The lower half of the interior of the non-enclosed circular tube semi-finished product 2 is a semi-circular segment 21, and the upper half is a square segment 22. The stamping die is installed on a press to complete the stamping operation.

[0031] Specifically, the bottom two sides of the upper correction fixture 6 are both upper end faces 61, and the top two sides of the lower correction fixture 7 are both lower end faces 71. When the upper correction fixture 6 and the lower correction fixture 7 are connected, the upper end faces 61 and the lower end faces 71 abut against each other.

[0032] When the semi-finished non-closed circular tube 2 needs further shaping, it is placed into the lower shaping groove 72 at the top of the lower shaping fixture 7. Then, a shaping rod 8 is placed inside the semi-finished non-closed circular tube 2, with a clearance fit between the shaping rod 8 and the inner wall of the semi-circular segment 21, controlled to a clearance of 0.02–0.05 mm. Finally, the upper shaping fixture 6 is pressed onto the top of the lower shaping fixture 7. The semi-finished non-closed circular tube 2 is located in the space formed by the upper shaping groove 62 and the lower shaping groove 72. The shaping rod 8 rotates to shape the semi-finished non-closed circular tube 2, ultimately becoming the finished non-closed circular tube 3. The shaping rod 8 has a clearance fit with the inner wall of the finished non-closed circular tube 3, controlled to a clearance of 0.02–0.05 mm. The interior of the finished non-closed circular tube 3 is arc-shaped, with a through-hole square groove 31 on one side of the top.

[0033] When using the correction fixture, it is installed on a press. The correction rod 8 can be rotated using an externally pre-set drive mechanism. This drive mechanism has a structure for clamping and fixing the rod 8. For example, a small electric hydraulic lifting platform can be installed at a pre-set position next to the press. A drive motor is installed on the top of the lifting platform, and a jaw sleeve is installed at the output end of the drive motor to clamp or fix the rod 8, ensuring that the rod 8 and the output shaft of the drive motor are coaxial. When removing or placing the non-enclosed round tube finished product 3 from the correction fixture 7, the press moves the upper correction fixture 6 upwards, and the lifting platform moves the drive motor and the rod upwards accordingly, facilitating the removal and placement of items inside the lower correction fixture 7. During downward correction, both the upper correction fixture 6 and the rod 8 move downwards. For small-batch production of non-enclosed round tube finished products 3, the rod 8 can also be manually rotated.

[0034] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A combination tooling for bending and forming non-enclosed circular tube sheet metal parts, characterized in that, The stamping die includes a preliminary forming die and a correction tooling for further forming. The stamping die includes an upper punch (4) and a lower die (5), which can be fitted together. The correction tooling includes an upper correction tooling (6) with an upper correction groove (62) at the bottom and a lower correction tooling (7) with a lower correction groove (72) at the top. A correction rod (8) is placed between the upper correction tooling (6) and the lower correction tooling (7).

2. The combined tooling for bending and forming non-enclosed circular tube sheet metal parts according to claim 1, characterized in that, The upper punch (4) includes a top plate, a guide plate is connected to the bottom of the top plate, and an extrusion plate is connected to the bottom of the guide plate.

3. The combined tooling for bending and forming non-enclosed circular tube sheet metal parts according to claim 2, characterized in that, The extrusion plate includes a semi-circular convex semi-circular section (41) and a convex square section (42) with both sides vertically arranged. The convex square section (42) is arranged above the convex semi-circular section (41), and its bottom is integrally connected to the convex semi-circular section (41), and its top is integrally connected to the guide plate.

4. The combined tooling for bending and forming non-enclosed circular tube sheet metal parts according to claim 3, characterized in that, Both sides of the connection between the bottom of the guide plate and the extrusion plate are downward convex end faces (43), and both sides of the connection between the bottom of the top plate and the guide plate are upward convex end faces (44).

5. A combined tooling for bending and forming non-enclosed circular tube sheet metal parts according to claim 4, characterized in that, The lower die (5) includes a guide cavity and a forming cavity, with the guide cavity located above the forming cavity and integrally formed with it.

6. A combined tooling for bending and forming non-enclosed circular tube sheet metal parts according to claim 5, characterized in that, The top two sides of the guide cavity are both concave end faces (54), and the bottom two sides of the guide cavity are both concave end faces (53).

7. A combined tooling for bending and forming non-enclosed circular tube sheet metal parts according to claim 6, characterized in that, The lower half of the forming cavity is a concave semicircular section (51), and the upper half is a concave square section (52). The concave semicircular section (51) and the concave square section (52) are integrally formed.

8. A combined tooling for bending and forming non-enclosed circular tube sheet metal parts according to claim 7, characterized in that, The bottom two sides of the upper correction fixture (6) are both upper end faces (61), and the top two sides of the lower correction fixture (7) are both lower end faces (71). When the upper correction fixture (6) and the lower correction fixture (7) are connected, the upper end face (61) and the lower end face (71) abut against each other.

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