A multi-link structure and a seaming device for forming a pre-seam and a seam

Abstract

The utility model discloses a kind of pre-edging and edging of forming multiple connecting rod structure and edging device, it includes base, lower mould, driving mechanism and the upper mould assembly including 45 ° pre-edging insert and 90 ° edging insert.The multiple connecting rod structure of the utility model includes the linkage of pressure arm, hinge plate, support etc. Through the linkage relationship of careful design, the multiple connecting rod structure can drive 45 ° pre-edging insert to pre-edging workpiece in succession in the stroke of driving mechanism, then make it fast avoid, drive 90 ° edging insert to complete final edging in succession. The utility model realizes the efficient one-time forming of pre-edging and edging, significantly improves production efficiency, simplifies process, with compact structure, movement reliable advantage.

Description

Technical Field

[0001] This utility model belongs to the field of automotive welding and specifically discloses a multi-link structure and edge-wrapping device for pre-forming and edge-wrapping. Background Technology

[0002] In the automotive welding industry, edge banding is a widely used process. The quality of edge banding directly affects the overall appearance, sealing performance, and fit of the vehicle. Therefore, a proper edge banding process is essential to ensure uniform assembly gaps between the opening / closing component and surrounding parts after assembly, thus achieving good appearance and interchangeability. Edge banding can be performed on opening components by a six-axis robot equipped with a rolling head, or by fixing a worktable to the ground and using a hydraulic cylinder connected to a mold to rotate it. However, existing technologies typically require separate pre-edge banding and final edge banding operations. For example, a preliminary angle (approximately 45°) pre-edge banding is performed first, followed by a final angle (approximately 90°). This step-by-step approach cannot automatically and efficiently complete the entire edge banding process within a single stroke of the hydraulic cylinder, reducing production efficiency, increasing process complexity, and raising equipment and tooling costs. Therefore, the industry urgently needs a new technology that can achieve pre-edge banding and overall edge banding forming in a single operation. Utility Model Content

[0003] This invention addresses the problem that the existing automotive parts edge-wrapping process typically requires separate pre-wrapping and final wrapping, resulting in low production efficiency and complex processes. It provides a multi-link structure and edge-wrapping device that can achieve pre-wrapping and edge-wrapping as a single operation.

[0004] To achieve the above objectives, according to the technical solution provided by the present invention, a multi-link structure for realizing one-time pre-edge binding and edge binding is provided, comprising a base, wherein the base is connected to a drive mechanism via a rotating shaft, and the central axis of the drive mechanism is perpendicular to the central axis of the rotating shaft; a lower mold is also provided on the base; a pressure arm is connected to the middle of the base via a second rotating shaft, and the lower mold and the drive mechanism are located on opposite sides of the second rotating shaft; one end of the pressure arm is connected to the drive mechanism via a first rotating shaft, and the other end of the pressure arm is provided with a 90° edge binding insert; a hinge plate is connected to the pressure arm via a fifth rotating shaft; a bracket is connected to the base via a fourth rotating shaft; the hinge plate and the bracket are located between the pressure arm and the lower mold; the hinge plate is connected to the pressure arm via a third rotating shaft; a 45° pre-edge binding insert is connected to the end of the bracket; the 45° pre-edge binding insert is located below the 90° edge binding insert. The structure is configured such that, within one stroke of the drive mechanism, the 45° pre-edge insert first pre-edges the workpiece at a 45° angle, and then the 90° edge insert edges the workpiece at a 90° angle.

[0005] Preferably, the driving mechanism is a hydraulic cylinder.

[0006] Preferably, the structure is configured such that after the pre-edge binding is completed, the 45° pre-edge binding insert moves outward through the linkage of the multi-link structure to avoid working interference with the 90° edge binding insert.

[0007] The present invention also provides an edge-wrapping device, characterized in that it includes the multi-link structure described in any one of the above claims for realizing pre-wrapping and edge-wrapping in one step.

[0008] By employing the above technical solution, this invention, through a cleverly designed multi-link mechanism (e.g., composed of a pressure arm, hinge plate, and bracket), can control a 45° pre-edge insert and a 90° edge-wrapping insert to sequentially pre-edge and finally edge the workpiece within a single stroke of the drive mechanism. Furthermore, the 45° pre-edge insert automatically avoids obstacles at appropriate times, thus achieving one-time forming of the pre-edge and edge-wrapping processes. This structure overcomes the shortcomings of existing technologies that require step-by-step operations, significantly improves edge-wrapping efficiency, simplifies the process flow, and reduces equipment and tooling costs, demonstrating high practical value and economic benefits. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments disclosed in this invention, the accompanying drawings of the embodiments will be briefly described below. These drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention.

[0010] Figure 1 This is a schematic diagram of the final pressure ending state of this utility model; Figure 2 This is a schematic diagram of the mold opening state of this utility model; Figure 3 This is a schematic diagram of the pre-packaging end state of this utility model; Figure 4 This is a schematic diagram of the -45° pre-wrapping principle of this utility model. Figure 5 This is a schematic diagram of the 90° edge binding principle of this utility model; The markings in the attached diagram are explained as follows: 1-Drive mechanism, 2-Pressure arm, 3-90° edge-sealing insert, 4-45° pre-edge-sealing insert, 5-Lower mold, 6-Base, 7-Bracket, 8-Rotating shaft, 9-First rotating shaft, 10-Second rotating shaft, 11-Fifth rotating shaft, 12-Third rotating shaft, 13-Fourth rotating shaft, 14-Hinge plate. Detailed Implementation

[0011] The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below with reference to the accompanying drawings and by way of listing some optional embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0012] This invention provides a multi-link structure for one-time forming of pre-edge binding and final edge binding of automotive parts, which is integrated into an edge binding device. The edge binding device mainly includes a base, a lower mold (or die mold), a drive mechanism, and an upper mold assembly comprising the multi-link structure of this invention and corresponding edge binding inserts.

[0013] refer to Figure 1-5 The illustration shows a schematic diagram of the edge-wrapping device according to a preferred embodiment of the present invention in different working states. The edge-wrapping device includes a stable base 6, which supports the entire device and fixes the lower mold 5. The lower mold 5, often referred to as a die in automotive parts edge-wrapping, provides the support surface for the workpiece to be edged and the cavity or shape required for the final edge-wrapping. The lower mold 5 can be fixedly mounted on the base 6.

[0014] The drive mechanism 1 provides the power required to perform the hemming process. In this embodiment, the drive mechanism 1 is preferably a hydraulic cylinder. The drive mechanism 1, such as a hydraulic cylinder, is fixedly mounted on the base 6. The extension and retraction of the hydraulic cylinder (typically an extension rod) generates a linear reciprocating motion, which is translated into a complex motion trajectory required by the upper mold assembly through a multi-link structure.

[0015] The core of this invention is a multi-link structure for achieving one-time pre-sealing and sealing. This multi-link structure includes multiple links, supports, and plates connected to each other via rotation axes. In this embodiment, the multi-link structure mainly includes a pressure arm 2, a hinge plate 14, and a support 7.

[0016] The pressure arm 2 is a key link in the multi-link structure. It is connected to the base 6 via the second rotating shaft 10, allowing it to rotate around the shaft. One end of the pressure arm 2 is connected to the output end of the drive mechanism 1 (e.g., the piston rod end of a hydraulic cylinder) via the first rotating shaft 9. When the drive mechanism 1 extends or retracts, it drives the pressure arm 2 to rotate around the second rotating shaft 10.

[0017] The upper die assembly includes two main edge-sealing tools: a 45° pre-edge-sealing insert 4 and a 90° edge-sealing insert 3. The 90° edge-sealing insert 3 is directly mounted at the other end of the pressure arm 2. Therefore, the movement of the pressure arm 2 directly determines the position and movement trajectory of the 90° edge-sealing insert 3.

[0018] To achieve the specific motion trajectory (including working and avoidance) of the 45° pre-edge insert 4, this invention designs a linkage mechanism that uses the movement of the pressure arm 2 to drive the 45° pre-edge insert 4. Specifically, a hinge plate 14 is connected to the pressure arm 2 via a fifth rotating shaft 11. The hinge plate 14 is connected to the bracket 7 via a third rotating shaft 12. The end of the bracket 7 is connected to the 45° pre-edge insert 4 via a fourth rotating shaft 13. As shown in the attached drawings, the hinge plate 14 and the bracket 7 are located between the pressure arm 2 and the lower die 5, and the 45° pre-edge insert 4 is located below the 90° edge insert 3 in the initial or pre-edge working position so as to contact the workpiece first.

[0019] The multi-link structure is connected as follows: the drive mechanism 1 drives the pressure arm 2 to rotate around the second rotation axis 10 via the first rotation axis 9. The rotation of the pressure arm 2 directly drives the 90° edge-sealing insert 3 on it to move; on the other hand, the pressure arm 2 drives the hinge plate 14 to move via the fifth rotation axis 11. The hinge plate 14 then drives the bracket 7 to move via the third rotation axis 12. The movement of the bracket 7 is finally transmitted to the 45° pre-edge-sealing insert 4 via the fourth rotation axis 13, causing it to move along a predetermined trajectory.

[0020] The entire workflow is as follows: Mold opening state (refer to) Figure 1 The drive mechanism 1 is in its initial position (e.g., the hydraulic cylinder piston rod is retracted), the pressure arm 2 and the upper mold assembly connected thereto (including the 45° pre-edge insert 4 and the 90° edge insert 3), as well as the linkage mechanism (hinge plate 14, bracket 7) are all in the raised or open position. The workpiece to be edged (e.g., an automotive inner and outer panel assembly) is placed in the lower mold 5.

[0021] Drive mechanism start-up and pre-edge binding stage: The drive mechanism 1 (e.g., a hydraulic cylinder) starts working, the piston rod extends, and pushes the pressure arm 2 through the first rotating shaft 9. The pressure arm 2 begins to rotate downward around the second rotating shaft 10. In the initial stage of the downward movement of the pressure arm 2, the linkage mechanism composed of the fifth rotating shaft 11, hinge plate 14, third rotating shaft 12 and bracket 7 is cleverly designed and adjusted so that the 45° pre-edge binding insert 4 moves rapidly downward and inward (or at an appropriate angle) along the set trajectory at the fourth rotating shaft 13, first contacting the edge of the workpiece and initially pressing it, completing the pre-edge binding of about 45° (see reference). Figure 2 ).

[0022] 45° Pre-edge Embossing Piece Avoidance and Final Edge Embossing Stage: Drive mechanism 1 continues its stroke (e.g., hydraulic cylinder piston rod continues to extend), and pressure arm 2 continues to move downward. At this time, the linkage of the multi-link structure changes. As the relative position of pressure arm 2 and hinge plate 14 changes, bracket 7 is driven at the third rotation axis 12, causing the 45° pre-edge embellishing piece 4 to begin moving outward or upward at the fourth rotation axis 13, quickly withdrawing from the workpiece edge area (see reference). Figure 3 (Position change of the 45° pre-edge insert 4). Simultaneously, or after the 45° pre-edge insert 4 has completed its clearance, the 90° edge insert 3, positioned on the pressure arm 2, moves further downwards due to the continuous downward movement of the pressure arm 2, contacting the edge of the workpiece that has already undergone pre-edge sealing, and pressing it completely into the cavity of the lower mold 5, completing the final edge sealing of approximately 90° (refer to...). Figure 3 ).

[0023] Final Pressing and Return: After the 90° edge-sealing insert 3 completes the final edge sealing, the drive mechanism 1 completes one full downward (edge-sealing direction) stroke. Then, the drive mechanism 1 moves in the reverse direction (e.g., the hydraulic cylinder piston rod retracts), causing the pressure arm 2 to rotate upward, and the entire upper mold assembly (including the 90° edge-sealing insert 3 and the 45° pre-edge-sealing insert 4 controlled by the linkage mechanism) is lifted upward, returning to the mold-open state. Figure 1 This completes one edge binding cycle.

[0024] Through the design of the multi-link structure described above, this invention achieves automatic and continuous completion of 45° pre-edge wrapping and 90° final edge wrapping within a single stroke of a drive mechanism (such as a hydraulic cylinder). After completing its task, the 45° pre-edge wrapping insert 4 can automatically and quickly avoid interference with the 90° edge wrapping insert 3, ensuring the smoothness and efficiency of the entire edge wrapping process.

[0025] In this embodiment, the multi-link structure includes a pressure arm 2, a hinge plate 14, and a bracket 7, as well as rotating shafts (9, 10, 11, 12, 13) connecting them. The lengths of each component, the positions of each rotating shaft, and the connection angles between them are precisely calculated and designed to ensure that within the specified stroke range of the drive mechanism 1, the 45° pre-edge insert 4 and the 90° edge insert 3 can complete the edge-wrapping action according to the predetermined timing and trajectory, and that the 45° pre-edge insert 4 can effectively avoid obstacles.

[0026] Furthermore, to assist in controlling the motion trajectory of the 45° pre-edge insert 4, particularly its outward avoidance action, the edge-binding device described in this invention can also be used in conjunction with a wedge mechanism. The wedge mechanism can be linked with appropriate components in the multi-link structure (e.g., the bracket 7 or the 45° pre-edge insert 4 itself). During a specific phase of the downward movement of the pressure arm 2, the wedge's inclined surface forces or assists the 45° pre-edge insert 4 to move outward. Although not all details of the wedge mechanism are shown in the claims and drawings, its use in conjunction with the multi-link structure is achievable by those skilled in the art based on the functional description.

[0027] Compared with existing technologies, this invention overcomes the shortcomings of traditional edge-wrapping processes that require step-by-step operations or mold changes through a clever multi-link structure design, achieving efficient one-time forming of pre-wrapping and edge wrapping. This significantly improves production efficiency, reduces equipment complexity and production costs, while also ensuring edge-wrapping quality. The multi-link structure of this invention is compact and reliable, making it suitable for fields such as automobile manufacturing that require precise edge forming.

[0028] It will be readily understood by those skilled in the art that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A multi-link structure with pre-sealed and sealed edges, characterized in that, The system includes a base (6), which is connected to a drive mechanism (1) via a rotating shaft (8). The central axis of the drive mechanism (1) is perpendicular to the central axis of the rotating shaft (8). A lower mold (5) is also provided on the base (6). A pressure arm (2) is connected to the middle of the base (6) via a second rotating shaft (10). The lower mold (5) and the drive mechanism (1) are located on opposite sides of the second rotating shaft (10). One end of the pressure arm (2) is connected to the drive mechanism (1) via a first rotating shaft (9). The other end of the pressure arm (2) is provided with a 90° edge-sealing insert (3). A fifth rotating shaft (11) is connected to the pressure arm (2). A hinge plate (14) is connected to a bracket (7) via a fourth rotating shaft (13) on the base (6). The hinge plate (14) and the bracket (7) are located between the pressure arm (2) and the lower mold (5). The hinge plate (14) is connected to the bracket (7) via a third rotating shaft (12). A 45° pre-edge binding block (4) is connected to the end of the bracket (7). The 45° pre-edge binding block (4) is located below the 90° edge binding block (3). Within one stroke, the driving mechanism (1) drives the 45° pre-edge binding block (4) to first perform a 45° pre-edge binding on the workpiece and then the 90° edge binding block (3) to perform a 90° edge binding on the workpiece.

2. The multi-link structure with pre-sealed and sealed edges as described in claim 1, characterized in that, The drive mechanism (1) is a hydraulic cylinder.

3. The multi-link structure with pre-sealed and sealed edges as described in claim 1 or 2, characterized in that, After the pre-edge binding is completed, the 45° pre-edge binding block (4) moves outward to avoid working interference with the 90° edge binding block (3).

4. An edge-binding device, characterized in that, Including the multi-link structure with pre-sealed and sealed edges as described in any one of claims 1-3.

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