A method for hemming, a hemming system, and a hemmed workpiece.

Abstract

This application relates to the field of hemming technology, disclosing a hemming processing method, a hemming processing system, and a hemmed workpiece. The method includes: placing the workpiece to be processed on a hemming film, and positioning the hemmed area of ​​the workpiece and the edge line of the hemming film in corresponding positions; wherein the hemmed area includes a first hemmed area and a second hemmed area, the second hemmed area being the area between the non-hemmed area and the hemmed area on the workpiece; controlling the hemming head to hemm the first hemmed area along the direction of the edge line trajectory of the film; while controlling the hemming head to hemm the second hemmed area along the direction of the edge line trajectory, simultaneously controlling the hemming head to move relative to the second hemmed area in a direction perpendicular to the hemming film. Applying the technical solution of this application enables a natural transition between the hemmed area and the non-hemmed area of ​​the workpiece, resulting in a smooth and even transition without protrusions.

Description

Technical Field

[0001] This application relates to the field of hemming technology, and in particular to a hemming method, hemming system and hemmed workpiece. Background Technology

[0002] Currently, the edge-wrapping process for aluminum alloy hoods in vehicles is usually completed using a robotic rolling process. This process allows for multiple rolling presses on the edges of the outer panel, which has already been rolled over, to wrap the inner panel and complete the connection between the two.

[0003] Due to the design of some vehicle models, the transition between the two sharp corners on the left and right sides of the rear of the hood is an acute angle, approximately 62 degrees. During the hemming process, this design, with its small angle and close proximity of the two sharp corners, can easily cause interference between the hemming head and the hood. Therefore, the two sharp corners on the left and right sides of the rear of the hood are designed with an open flange structure (without edge binding). The open flange area is approximately 12mm long, while the other areas are closed flange structures (requiring edge binding).

[0004] However, in actual production, it was found that there was a quality defect in this structural design: there was a raised area between the left and right corners of the front cover and the closed flange area. The raised area was quite noticeable to the eye and touch, which affected the processing quality of the front cover. Summary of the Invention

[0005] To address the aforementioned issues, embodiments of this application provide a rolling edge processing method, a rolling edge processing system, and a rolling edge workpiece, which enables a natural transition between the edged and non-edged areas of the workpiece to be processed, and ensures a smooth and even transition between the edged and non-edged areas without any protrusions.

[0006] On one hand, embodiments of this application provide a hemming processing method, including: placing the workpiece to be processed on a hemming film, and positioning the hemmed area of ​​the workpiece to be processed and the edge line of the hemming film in corresponding positions; wherein, the hemmed area includes a first hemmed area and a second hemmed area, the second hemmed area being the area between the non-hemmed area and the hemmed area on the workpiece to be processed; controlling the hemming head to perform hemming processing on the first hemmed area along the direction of the edge line trajectory of the film; while controlling the hemming head to perform hemming processing on the second hemmed area along the direction of the edge line trajectory, controlling the hemming head to move relative to the second hemmed area in a direction perpendicular to the hemming film.

[0007] In this embodiment, after placing the workpiece to be processed on the edging film, the edge-sealing area and the edge line of the film are positioned in corresponding positions, ensuring that the workpiece is in the correct position relative to the edging head, thus improving the accuracy of the edge-sealing formation position. Furthermore, by controlling the movement trajectory of the edging head according to the edge line trajectory of the film, the shape of the edge formed on the workpiece after being rolled by the edging head is consistent with the edge line trajectory, improving the accuracy of the edge shape. Moreover, when the edging head rolls to the second edging area, while controlling the movement of the edging head along the edge line trajectory, the edging head is also slowly moved towards or away from the second edging area in a direction perpendicular to the edging film. This allows the edging head to roll the flange within the second edging area, avoiding interference between the edging head and the workpiece. This results in a natural transition between the edge-sealing area and the non-edge-sealing area of ​​the workpiece, and the second edging area between the edge-sealing area and the non-edge-sealing area is smooth and flat without any protrusions.

[0008] In one possible implementation of this application, while controlling the rolling head to roll the second rolling area along the direction of the ridge trajectory, the rolling head is also controlled to move relative to the second rolling area in a direction perpendicular to the rolling film. This includes: controlling the rolling head to roll the second rolling area from the first rolling area to the second rolling area; wherein, while the rolling head rolls the second rolling area along the direction of the ridge trajectory, the rolling head is controlled to gradually move away from the workpiece in a direction perpendicular to the rolling film until the rolling head disengages from the second rolling area.

[0009] In one possible implementation of this application, while controlling the rolling head to roll the second rolling area along the direction of the ridge trajectory, the rolling head is also controlled to move relative to the second rolling area in the direction perpendicular to the rolling film. This includes: controlling the rolling head to roll the second rolling area from the second rolling area to the first rolling area; wherein, while the rolling head rolls the second rolling area along the direction of the ridge trajectory, the rolling head is controlled to gradually move towards the workpiece to be processed in the direction perpendicular to the rolling film until the rolling head reaches the first rolling area.

[0010] In one possible implementation of this application, the hemming process further includes: performing at least one re-pressing on the first hemming region; wherein the rolling angle of the current re-pressing is smaller than the rolling angle of the previous hemming process.

[0011] In one possible implementation of this application, after placing the workpiece to be processed on the edging film and positioning the edge area of ​​the workpiece to be processed in a corresponding position with the edge line of the edging film, the method further includes: detecting the positional difference between the workpiece to be processed and the edging film; and adjusting the edging processing system if the positional difference is greater than a preset stability difference.

[0012] In one possible implementation of this application, the hemming system includes: a loading table, inner and outer panel pre-assembly fixtures, and a conveying mechanism; adjusting the hemming system includes at least one of the following: adjusting the position of the loading table to adjust the position of the workpiece before it is placed on the hemming die; adjusting the inner and outer panel pre-assembly fixtures to adjust the clamping stability of the workpiece after pre-assembly; and adjusting the conveying mechanism so that the conveying mechanism can grasp the same position for each workpiece.

[0013] In one possible implementation of this application, after placing the workpiece to be processed on the rolled edge film and positioning the edge area of ​​the workpiece to be processed in a corresponding position with the edge line of the rolled edge film, the method further includes: detecting the relative position between the second rolled edge area and the edge line of the film; and adjusting the positional relationship between the second rolled edge area and the edge line of the film when the projection of the second rolled edge area is located on the rolled edge film and the distance between the projection and the edge line of the film is greater than a preset shrinkage difference in the direction toward the center of the rolled edge film.

[0014] In one possible implementation of this application, adjusting the positional relationship between the second rolled edge area and the ridge line of the membrane includes at least one of the following: adjusting the motion trajectory of the conveying mechanism so that the distance between the projection and the ridge line of the membrane meets a preset shrinkage difference; modifying the rolled edge of the workpiece to be processed so that the distance between the projection and the ridge line of the membrane meets a preset shrinkage difference.

[0015] In one possible implementation of this application, the rolling angle of the rolling head remains unchanged during the process of the rolling head moving from the first rolling area to the second rolling area, or from the second rolling area to the first rolling area.

[0016] On the other hand, embodiments of this application also provide a hemming processing system, including: a hemming film, a switching mechanism, a conveying mechanism, and at least one hemming mechanism, wherein the hemming film is fixed on a film fixing seat and has film ridges for supporting the workpiece to be processed; the switching mechanism is used to switch the hemming film on the film fixing seat; the conveying mechanism is used to move the workpiece to be processed onto the hemming film or to remove the workpiece to be processed from the hemming film; each hemming mechanism is provided with a hemming head, and the hemming mechanism is used to drive the hemming head to move along the direction of the ridge trajectory of the film ridges to perform hemming processing on the edge area of ​​the workpiece to be processed.

[0017] In another aspect, embodiments of this application also provide a rolled edge workpiece, which includes an outer plate and an inner plate. The outer plate includes an edge-sealing area, and the edge-sealing area is rolled to form an edge. The inner plate and the outer plate are fixedly connected by the edge-sealing. The edge-sealing is formed by the rolling edge processing method provided in any of the above embodiments.

[0018] The rolled edge workpiece provided in this application embodiment is formed by the rolled edge processing method provided in any of the above embodiments. Therefore, for the rolled edge workpiece after processing, the edge area and the non-edge area of ​​the rolled edge workpiece transition naturally, and the edge area and the non-edge area are smooth and flat without any protrusions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the workpiece to be processed provided in an embodiment of this application; Figure 2 Images of workpieces processed using existing rolling edge methods; Figure 3 This is a schematic diagram of the hemming system corresponding to the hemming method provided in the embodiments of this application. Figure 4 A flowchart of the hemming process provided in the embodiments of this application; Figure 5 A flowchart of the hemming process provided in the embodiments of this application; Figure 6 A flowchart of the hemming process provided in the embodiments of this application; Figure 7 A flowchart of the hemming process provided in the embodiments of this application; Figure 8 A flowchart of the hemming process provided in the embodiments of this application; Figure 9 A flowchart of the hemming process provided in the embodiments of this application.

[0020] Figure label: 1-Workpiece to be processed; 11-Outer panel; 12-Inner panel; 111-First rolling edge area; 112-Second rolling edge area; 113-Non-rolling edge area; 2-Rolling edge film; 3-Switching mechanism; 4-Transferring mechanism; 5-Rolling edge mechanism; 6-Loading platform; 7-Film fixing seat. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application. The step numbers in the following embodiments are not a limitation on the execution order of each step; the step numbers are only for ease of description. Different execution orders of steps can be combined in a logical order to solve the same technical problem.

[0022] Reference Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the workpiece to be processed provided in an embodiment of this application. Figure 2 Images of workpieces to be processed using existing rolling edge methods. (Example) Figure 1 As shown, in the process of designing the appearance of some vehicle models, the sharp corners of some workpieces 1 to be processed on the vehicle are set as acute angles, which can improve the aesthetics of the overall vehicle appearance. The workpiece 1 to be processed usually includes an outer panel 11 and an inner panel 12. By rolling the first rolling edge area 111 of the outer panel 11, the first rolling edge area 111 on the outer panel 11 forms a edging. No edging is set in the non-edging area 113. The non-edging area 113 only has a flange with a height of 2 to 4 mm. There is a second rolling edge area 112 between the first rolling edge area 111 and the non-edging area 113. The first rolling edge area 111 with edging is connected through the second rolling edge area 112 and the non-edging area 113.

[0023] For example, the two sharp corners on the hood near the windshield are designed as acute angles. Due to limitations in the rolling process, the non-edge-bound area 113 near the sharp corners is designed not to be edge-bound. Instead, the inner panel 12 and outer panel 11 of the hood are fixed by edge-bound the first rolled edge area 111. However, after rolling the first rolled edge area 111 using existing edge-bound processing methods, such as... Figure 2 As shown, a protrusion will form in the second rolling area 112 between the first rolling area 111 and the non-rolling area 113 of the front cover. This protrusion will affect the processing quality of the front cover and reduce the level of precision in the vehicle's manufacturing process. If this defect is to be repaired, highly skilled personnel are required, and the repair will be time-consuming and costly.

[0024] Based on this, embodiments of this application provide a hemming system and a hemming method. This hemming system and method effectively solve the problem of protrusions appearing on the second hemmed area 112 of the workpiece 1. The hemming method provided in this application is not limited to processing vehicle hoods; it can be applied to any workpiece requiring hemming, and this application does not impose any limitations on this application.

[0025] Reference Figure 3 , Figure 3 This is a schematic diagram of the hemming system corresponding to the hemming method provided in this application embodiment. The hemming system includes: a hemming film 2, a switching mechanism 3, a transport mechanism 4, and at least one hemming mechanism 5. The hemming film 2 is fixed on the film fixing seat 7 and has a film ridge. The hemming film 2 is used to support the workpiece 1 to be processed. The switching mechanism 3 is used to switch the hemming film 2. The transport mechanism 4 is used to move the workpiece 1 to be processed from the loading table 6 to the hemming film 2, or to move the workpiece 1 to be processed from the hemming film 2 to the position of the next process. Each hemming mechanism 5 has a hemming head. For example, two hemming mechanisms 5 can be set. The hemming mechanism 5 can drive the hemming head to move along the film ridge to roll the area on the workpiece 1 that needs to be hemmed along the film ridge, so that the area on the workpiece 1 that needs to be hemmed forms an edge.

[0026] For example, the switching mechanism 3 can be a robotic arm, the handling mechanism 4 can be a handling robot, the hemming mechanism 5 can be a hemming robot, and the hemming film 2 can be set in multiple ways according to different workpieces. The embodiments of this application do not limit the composition and form of the various mechanisms included in the hemming processing system.

[0027] In this embodiment, due to the setting of the switching mechanism 3, when one of the multiple edge-rolling films 2 needs to be used, the required edge-rolling film 2 can be switched to the film fixing seat 7 through the switching mechanism 3; and the setting of the conveying mechanism 4 can realize the automatic conveying of the workpiece 1 to be processed through the conveying mechanism 4, and can improve the positioning accuracy of the workpiece 1 to be processed during the conveying process; at the same time, the setting of the edge-rolling mechanism 5 can realize the automatic edge-rolling of the workpiece 1 to be processed, so as to improve the efficiency and processing quality of edge-rolling processing of the workpiece 1 to be processed.

[0028] Reference Figure 4 , Figure 4 A flowchart illustrating a hemming process method provided in this application embodiment. This method can be executed by a processor of a computer device and includes the following steps: S101. Place the workpiece to be processed on the edge rolling film, and make the edge-sealing area of ​​the workpiece to be processed and the edge line of the edge rolling film correspond to each other; wherein, the edge-sealing area includes a first edge rolling area and a second edge rolling area, and the second edge rolling area is the area between the non-edge rolling area and the edge rolling area on the workpiece to be processed.

[0029] In some embodiments, due to considerations such as processing methods and the appearance effect after processing, not all parts of the workpiece to be processed that require edge binding are edge-bound. Instead, some areas are designed not to be edge-bound, i.e., the workpiece to be processed has edge-bound areas and non-edge-bound areas. Depending on the rolling method used for different parts within the edge-bound area of ​​the workpiece to be processed, the edge-bound area is divided into a first rolling area and a second rolling area, wherein the second rolling area is the area within the edge-bound area adjacent to the non-edge-bound area.

[0030] During the hemming process of a workpiece, a hemming die can be used to support and position it. The working surface of the hemming die matches the surface of the outer panel of the workpiece, and the hemming die has ridge lines that match the shape of the workpiece after processing. During the hemming process, the hemming mechanism can be controlled to move the hemming head along the ridge line trajectory, thereby rolling the flange on the outer panel of the workpiece into the required edge.

[0031] Before performing edge rolling on different workpieces, the workpiece is placed on the edge rolling film, and the position of the edge area of ​​the workpiece corresponds to the position of the edge line of the edge rolling film. The edge rolling head is then controlled to roll the edge of the edge area according to the edge trajectory of the edge line.

[0032] S102. Control the rolling head to perform rolling processing on the first rolling area along the direction of the ridge line trajectory of the rim line.

[0033] In some embodiments, after placing the workpiece to be processed on the rolling die and positioning it correctly, the rolling angle of the rolling head is adjusted to control the rolling head to perform a first pass of rolling processing on the first rolling area along the edge trajectory. During the rolling processing of the first rolling area, the rolling direction of the rolling head is not limited; that is, the rolling head can roll the first rolling area from the first rolling area towards the second rolling area, or from the second rolling area towards the first rolling area.

[0034] For example, the rolling angle of the rolling head is adjusted to 60 degrees, that is, the angle between the rolling head and the workpiece to be processed is 60 degrees. The rolling head is controlled to roll the first rolling area from one end of the first rolling area so as to roll the flange in the first rolling area to an angle of 60 degrees with the workpiece to be processed.

[0035] S103. While controlling the rolling head to perform rolling processing on the second rolling area along the direction of the edge trajectory, control the rolling head to move relative to the second rolling area in the direction perpendicular to the rolling film.

[0036] In some embodiments, after the rolling head finishes rolling the first rolling area of ​​the workpiece, it is not controlled to immediately withdraw. Instead, the rolling head is controlled to continue rolling in the direction of the ridge trajectory in the second rolling area. At the same time, in the direction perpendicular to the rolling film, the rolling head is controlled to move away from the second rolling area.

[0037] Alternatively, from the non-edge-sealed area towards the first edge-sealed area, while rolling the second edge-sealed area along the ridge trajectory, the rolling head is simultaneously controlled to move closer to the second edge-sealed area in a direction perpendicular to the edge-sealed film, thus completing the rolling of the second edge-sealed area. For example, the second edge-sealed area on the workpiece can be set to 4 to 7 mm, and the length of the second edge-sealed area can be determined based on the thickness of the workpiece to be rolled, the height difference between the flange height of the first edge-sealed area and the flange height of the non-edge-sealed area, etc.

[0038] In this embodiment, after placing the workpiece to be processed on the edging film, the edge-sealing area and the edge line of the film are positioned in corresponding positions, ensuring that the workpiece is in the correct position relative to the edging head, thus improving the accuracy of the edge-sealing formation position. Furthermore, by controlling the movement trajectory of the edging head according to the edge line trajectory of the film, the shape of the edge formed on the workpiece after being rolled by the edging head is consistent with the edge line trajectory, improving the accuracy of the edge shape. Moreover, when the edging head rolls to the second edging area, while controlling the movement of the edging head along the edge line trajectory, the edging head is also slowly moved towards or away from the second edging area in a direction perpendicular to the edging film. This allows the edging head to roll the flange within the second edging area, avoiding interference between the edging head and the workpiece. This results in a natural transition between the edge-sealing area and the non-edge-sealing area of ​​the workpiece, and the second edging area between the edge-sealing area and the non-edge-sealing area is smooth and flat without any protrusions.

[0039] In some embodiments, such as Figure 4 As shown, the above-mentioned S103 can be implemented by S1031.

[0040] S1031. Control the rolling head to roll the second rolling area from the first rolling area to the second rolling area; wherein, while the rolling head rolls the second rolling area along the direction of the edge trajectory, the rolling head is controlled to gradually move away from the workpiece in the direction perpendicular to the rolling film until the rolling head separates from the second rolling area.

[0041] In some embodiments, during the edge rolling process of the workpiece to be processed, the direction of the edge rolling head along the edge trajectory can be controlled to perform edge rolling from the first edge rolling area on the workpiece to the non-edge rolling area, so as to complete the first rolling of the workpiece to be processed.

[0042] For example, before the rolling head contacts the flange in the first rolling area on the workpiece to be processed, the rolling head is adjusted to the desired rolling angle, for example, the rolling head is adjusted to an angle of 60 degrees with the workpiece to be processed, and the rolling head is controlled to roll from the first rolling area on the workpiece to the non-rolling area along the direction of the edge trajectory, so as to roll the flange in the first rolling area from 90 degrees to 60 degrees. After the edge rolling head has finished rolling the flange in the first edge rolling area and is approaching the non-edge rolling area, control the edge rolling head to continue rolling at a rolling angle of 60 degrees along the edge trajectory towards the non-edge rolling area to roll the second edge rolling area. After the edge rolling head enters the second edge rolling area, in the direction perpendicular to the edge rolling film or in the direction perpendicular to the edge trajectory, control the edge rolling head to gradually and continuously move away from the workpiece until the edge rolling head separates from the workpiece. That is, in the second edge rolling area, while controlling the edge rolling head to roll the flange in the second edge rolling area, control the edge rolling head to gradually and slowly withdraw, separating from the second edge rolling area before the edge rolling head reaches the non-edge rolling area.

[0043] In this embodiment, after the flanging and rolling of the first rolled area on the workpiece is completed, the rolling head is not immediately disengaged from the workpiece. Instead, the rolling head continues to roll the second rolled area between the first rolled area and the non-wrapped area. To avoid interference between the rolling head and the non-wrapped area, the rolling head is slowly withdrawn while rolling the second rolled area. This allows for rolling of the flanging between the first rolled area with edging and the non-wrapped area without edging, preventing protrusions in the second rolled area and thus improving the quality of the rolled edge processing on the workpiece.

[0044] In some embodiments, such as Figure 4 As shown, the above-mentioned S103 can also be implemented by S1032.

[0045] S1032. Control the rolling head to roll the second rolling area from the second rolling area to the first rolling area; wherein, while the rolling head rolls the second rolling area along the direction of the edge trajectory, the rolling head is controlled to gradually move towards the workpiece to be processed in the direction perpendicular to the rolling film until the rolling head reaches the first rolling area.

[0046] In some embodiments, during the edge rolling process of the workpiece to be processed, the edge rolling head can be controlled to roll along the direction of the edge trajectory from the non-edge area on the workpiece to the first edge rolling area to complete the first rolling of the workpiece to be processed.

[0047] For example, before rolling, the rolling angle of the rolling head is adjusted to 60 degrees. The rolling head is controlled to roll along the edge trajectory from the non-edge area on the workpiece to the first rolling area. Before the rolling head starts rolling, in order to avoid interference between the rolling head and the non-edge area, a certain distance is maintained between the rolling head and the non-edge area. While the rolling head moves towards the first rolling area along the edge trajectory, it is also controlled to gradually and continuously move closer to the workpiece in the direction perpendicular to the rolling film. The movement is such that the rolling head slowly contacts the second rolling area and gradually increases the rolling area of ​​the second rolling area, so that the rolling head reaches the position to roll the first rolling area just before entering the first rolling area. That is, the rolling head is just in the rolling posture to roll the first rolling area. The rolling head is controlled along the edge trajectory to maintain the rolling posture to roll the first rolling area and complete the rolling of the first rolling area, so as to roll the flanging in the first rolling area from 90 degrees to 60 degrees.

[0048] In this embodiment, before rolling the first rolled edge area on the workpiece, the rolling head is controlled to move gradually towards the second rolled edge area while moving along the direction of the edge trajectory towards the first rolled edge area to roll the second rolled edge area. Then, the flange of the first rolled edge area is rolled to form the desired edge. In this way, the second rolled edge area can be rolled without interference between the rolling head and the non-edge area, preventing protrusions from forming in the second rolled edge area and improving the quality of the rolled edge processing on the workpiece.

[0049] Reference Figure 5 , Figure 5 A flowchart of a hemming process method provided in an embodiment of this application. The method further includes the following step S201, which combines... Figure 5 The steps shown are explained.

[0050] S201. Perform at least one re-pressing on the first rolled edge area; wherein the rolling angle of the current re-pressing is smaller than the rolling angle of the previous rolled edge processing.

[0051] In some embodiments, after the first rolling process of the workpiece is completed, the flanging on the workpiece is not formed into the final required edge, and the workpiece needs to be rolled at least once more to roll the flanging into the final required edge.

[0052] For example, two re-pressing processes can be performed. After the first round of hemming of the workpiece, before the first re-pressing, the rolling angle of the hemming head is adjusted from 60 degrees to 30 degrees. The hemming head is controlled to follow the edge trajectory to perform the first re-pressing on the first hemmed area, rolling the flange in the first hemmed area to 30 degrees. Then, the rolling angle of the hemming head is adjusted from 30 degrees to 0 degrees, and the hemming head is controlled to follow the edge trajectory to perform the second re-pressing on the first hemmed area, rolling the flange in the first hemmed area to 0 degrees, forming the required edge in the first hemmed area to fix the outer and inner panels of the workpiece. During the first and second re-pressing processes, the hemming head can be controlled to roll the first hemmed area from the first hemmed area to the second hemmed area, or it can be controlled to roll the first hemmed area from the second hemmed area to the first hemmed area, but the second hemmed area is not rolled in either case.

[0053] In this embodiment, since the control of the rolling head has applied at least one re-pressing to the first rolling area on the workpiece to be processed, the flange in the first rolling area can be rolled and pressed tightly against the inner plate of the workpiece to be processed, so that an edge is formed in the first rolling area, thereby completing the fixation of the outer plate and the inner plate of the workpiece to be processed.

[0054] Reference Figure 6 , Figure 6 A flowchart illustrating the hemming process provided in this application embodiment. Figure 6 As shown, after completion Figure 1 After S101 and before S102, the method further includes the following steps S301 to S302, which combine... Figure 6 The steps shown are explained.

[0055] S301. Detect the positional difference between the workpiece to be processed and the rolled edge mold.

[0056] In some embodiments, before performing hemming on multiple workpieces, the placement position of the workpieces on the hemming die can be detected to ensure that each workpiece is in the correct position after being placed on the hemming die.

[0057] For example, the same workpiece can be placed 3 to 5 times. After each workpiece is placed on the rolling die, the distance between the detection point on the workpiece and the detection point on the rolling die is detected. The distance between the detection point on the workpiece and the detection point on the rolling die is used as the position difference between the two.

[0058] S302. If the position difference is greater than the preset stability difference, adjust the hemming system.

[0059] In some embodiments, the positional difference measured multiple times is compared with a preset stability difference, for example, the preset stability difference can be set to 0.2 mm. If there is a positional difference greater than 0.2 mm, it indicates that the positional fluctuation of the workpiece to be processed relative to the rolling die is large, which will affect the processing accuracy of the rolling process of the workpiece to be processed. In this case, it is necessary to check and adjust the various mechanisms in the rolling process system so that the positional difference between the workpiece to be processed and the rolling die is less than the preset stability difference.

[0060] In some embodiments, refer to Figure 7 ,like Figure 7 As shown, the above-mentioned S302 can be implemented by at least one of S3021 to S3023.

[0061] S3021. Adjust the position of the loading table to adjust the position of the workpiece to be processed before placing it on the rolling die.

[0062] In some embodiments, the position of the loading platform storing the workpieces to be processed can be detected to determine whether the loading platform is in the correct position. If the loading platform deviates from its original position, its position needs to be adjusted to ensure it is in the correct position. This ensures that the workpieces to be processed are in the correct position before being placed on the hemming film, allowing the transport mechanism to accurately grasp the position of each workpiece during transport and place it correctly on the hemming film.

[0063] S3022. Adjust the pre-assembly fixtures for the inner and outer plates to adjust the clamping stability of the workpiece after pre-assembly.

[0064] In some embodiments, the pre-assembly fixtures for the inner and outer panels of the workpiece can be inspected to determine whether they can be correctly positioned on the inner and outer panels of the workpiece. If the pre-assembly fixtures cannot be accurately positioned on the workpiece, the relative position between the inner and outer panels may change, affecting the accuracy of the workpiece's placement on the hemming die. Adjusting the pre-assembly fixtures improves the stability of the clamping between the inner and outer panels, ensuring that they are in the correct relative position.

[0065] S3023. Adjust the conveying mechanism so that it can grasp the same position for each workpiece to be processed.

[0066] In some embodiments, if there are gaps between the various parts of the conveying mechanism, it cannot be guaranteed that the conveying mechanism will move to the same position in every movement. Therefore, when the conveying mechanism grasps the workpieces to be processed, it cannot guarantee that it will grasp each workpiece at the same position every time. In such cases, it is necessary to adjust or repair the various parts of the conveying mechanism to improve the accuracy of its movement. This will ensure that the conveying mechanism can grasp the workpieces at the same position every time and move them to the same location.

[0067] Reference Figure 8 , Figure 8 A flowchart illustrating the hemming process provided in this application embodiment. Figure 8 As shown, after completion Figure 1 After S101 and before S102, the method further includes the following steps S401 to S402, which combine... Figure 8 The steps shown are explained.

[0068] S401. Detect the relative position between the second rolled edge area and the ridge line of the membrane.

[0069] In some embodiments, after detecting whether the relative position between the workpiece to be processed and the roll edge film is accurate, it is also necessary to detect the relative position between the second roll edge area and the film ridge line on the roll edge film to ensure that the second roll edge area is in the correct position relative to the film ridge line.

[0070] S402. When the projection of the second edge rolling area is located on the edge rolling membrane, and the distance between the projection and the membrane ridge line is greater than the preset shrinkage difference in the direction closer to the center of the edge rolling membrane, the positional relationship between the second edge rolling area and the membrane ridge line is adjusted.

[0071] In some embodiments, if the second rolled edge region is closer to the center of the rolled membrane than the membrane ridge line (i.e., the distance between the projection of the second rolled edge region on the rolled membrane and the membrane ridge line is greater than a preset shrinkage difference), then the relative position between the second rolled edge region and the membrane ridge line needs to be adjusted to ensure the second rolled edge region is in the correct position relative to the membrane ridge line. If the distance between the projection of the second rolled edge region and the membrane ridge line is greater than 0.5 mm, there is a risk that the rolled edge head will not be able to contact the second rolled edge region, making it impossible to roll the second rolled edge region.

[0072] In some embodiments, refer to Figure 9 ,like Figure 9 As shown, the above-mentioned S402 can be implemented by at least one of S4021 to S4022.

[0073] S4021. Adjust the movement trajectory of the transport mechanism so that the distance between the projection and the ridge line of the membrane meets the preset shrinkage difference.

[0074] In some embodiments, the movement trajectory of the conveying mechanism may be set unreasonably, resulting in the workpiece not being positioned correctly after being placed on the hemming film by the conveying mechanism. In such cases, the movement trajectory of the conveying mechanism can be adjusted or optimized to ensure that the conveying mechanism can place the workpiece in the correct position on the hemming film each time it is moved, so that the distance between the projection of the second hemming area on the hemming film and the edge line of the film meets the preset shrinkage difference value.

[0075] S4022. Modify the flange edge of the workpiece to be processed so that the distance between the projection and the edge of the membrane meets the preset shrinkage difference value.

[0076] In some embodiments, the position of the flange ridge line within the designed edge area may be incorrect during the initial design phase, resulting in an incorrect flange formation position on the workpiece to be processed in the initial phase. Therefore, the design position of the flange ridge line on the workpiece to be processed can be changed to ensure that the flange is formed in the correct position, thereby ensuring that the distance between the projection of the second edge area on the edge film and the film ridge line meets the preset shrinkage difference value.

[0077] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for edge rolling, characterized in that, The method includes: The workpiece to be processed is placed on the edge-rolling film, and the edge-wrapping area of ​​the workpiece to be processed is in a corresponding position with the edge line of the edge-rolling film; wherein, the edge-wrapping area includes a first edge-rolling area and a second edge-rolling area, and the second edge-rolling area is the area between the non-edge-wrapping area and the edge-wrapping area on the workpiece to be processed. The rolling head is controlled to perform rolling processing on the first rolling area along the direction of the ridge trajectory of the membrane ridge; The rolling head is controlled to roll the second rolling area along the direction of the ridge trajectory. When the rolling head is controlled to roll the second rolling area from the first rolling area to the second rolling area, while rolling the second rolling area along the direction of the ridge trajectory, the rolling head is controlled to gradually move away from the workpiece in a direction perpendicular to the rolling film until the rolling head disengages from the second rolling area. When the rolling head is controlled to roll the second rolling area from the second rolling area to the first rolling area, while rolling the second rolling area along the direction of the ridge trajectory, the rolling head is controlled to gradually move closer to the workpiece in a direction perpendicular to the rolling film until the rolling head reaches the first rolling area.

2. The hemming process method according to claim 1, characterized in that, Also includes: The first rolled edge area is subjected to at least one re-pressing; In this case, the rolling angle of the current re-pressing is smaller than the rolling angle of the previous edge rolling process.

3. The hemming process method according to claim 1, characterized in that, After placing the workpiece to be processed on the hemming film and aligning the hemmed area of ​​the workpiece with the edge line of the hemming film, the method further includes: The positional difference between the workpiece to be processed and the edge-rolling liner is detected; If the positional difference is greater than a preset stability difference, the hemming system is adjusted.

4. The hemming process method according to claim 3, characterized in that, The hemming system includes: a loading table, inner and outer panel pre-assembly fixtures, and a handling mechanism; The adjustment of the hemming system includes at least one of the following: Adjust the position of the loading table to adjust the position of the workpiece before it is placed on the hemming die; Adjust the inner and outer plate pre-assembly fixtures to adjust the clamping stability of the workpiece after pre-assembly; Adjust the conveying mechanism so that it can grasp the same position for each of the workpieces to be processed.

5. The hemming process method according to claim 1, characterized in that, After placing the workpiece to be processed on the hemming film and aligning the hemmed area of ​​the workpiece with the edge line of the hemming film, the method further includes: Detect the relative position between the second rolled edge area and the membrane ridge line; When the projection of the second rolled edge area is located on the rolled edge membrane, and the distance between the projection and the membrane ridge line is greater than a preset shrinkage difference in the direction toward the center of the rolled edge membrane, the positional relationship between the second rolled edge area and the membrane ridge line is adjusted.

6. The hemming process method according to claim 5, characterized in that, Adjusting the positional relationship between the second rolled edge area and the membrane ridge line includes at least one of the following: Adjust the movement trajectory of the conveying mechanism of the hemming processing system so that the distance between the projection and the ridge line of the membrane meets the preset shrinkage difference value; Modify the flange edge of the workpiece to be processed so that the distance between the projection and the membrane edge satisfies the preset shrinkage difference value.

7. A rolled edge workpiece, characterized in that, include: The outer panel and the inner panel, wherein the outer panel includes an edge-binding area, and the edge-binding area is rolled to form an edge, and the inner panel and the outer panel are fixedly connected by the edge-binding; The edge is formed by the rolling edge processing method described in any one of claims 1 to 6.

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